• 专利附录
  • 专利说明
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  • 类似技术
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    • 专利摘要:
    ENGINE DRIVEN AND CONTROLLED BY A POWER CONVERSION DEVICE AND SYSTEM FOR ENGINE DRIVING. A three-phase AC motor (4) has a configuration where an inductance on the q-axis is greater than an inductance on the d-axis of a predetermined amount or more to allow filtering of power fluctuations due to the supply voltage of the power supply of AC (3).
    公开号:BR112012006447B1
    申请号:R112012006447-9
    申请日:2010-09-29
    公开日:2020-10-27
    发明作者:Akio Yamagiwa；Toshinari Kondou；Yoshihito Sanga
    申请人:Daikin Industries, Ltd.；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    The present invention relates to an engine that is driven and controlled by a power conversion device that includes a converter section and an inverter section. PREVIOUS TECHNIQUE
    Conventionally, motors configured to be driven and controlled by a power conversion device are known, which include a converter section that rectifies the alternating current power of an alternating current power source and an inverter section that converts a section output converter in alternating current power at a predetermined frequency. In a conventional power conversion device for starting and controlling a motor, a capacitor is provided, such as an electrolytic capacitor that has a relatively large capacitance on one output side of the converter section to smooth voltage fluctuations due to a voltage input power from the AC power source.
    For example, as revealed in PATENT DOCUMENT 1, a configuration is known in which a reduction in the size of a rectifying section and a cost reduction are obtained by changing an electrolytic capacitor with a high capacitance and which can smooth voltage fluctuations. due to an input power voltage by a capacitor that has a small capacitance and that can smooth out only voltage fluctuations generated when switching operations of switching elements of the inverter section are performed. LIST OF QUOTES PATENT DOCUMENT
    PATENT DOCUMENT 1: Japanese Patent Publication No. 2002-51589 SUMMARY OF THE INVENTION TECHNICAL PROBLEM
    When a filter capacitor is exchanged for a capacitor having capacitance with which only voltage fluctuations generated are performed when switching operations of switching elements of an inverter section can be filtered as described above, the capacitor, unlike the filter capacitor, it cannot filter voltage fluctuations due to a supply voltage from an AC power source. Therefore, a voltage with the remaining voltage fluctuations is supplied to one side 15 of the motor, and a torque ripple appears in the motor. Thus, the rotational speed of the engine fluctuates, increasing engine vibration and noise.
    In the aforementioned power conversion device, including a capacitor with a small capacitance, a current supplied next to the motor also oscillates, and thus, the copper loss in a motor coil is greatly increased. In addition, when a motor current oscillates as described above, the magnetic flux generated in the motor also oscillates, thus increasing iron loss.
    In view of the aforementioned points, the present invention was envisioned, being therefore an objective of the present invention to provide a configuration that allows the reduction of vibration and noise and the increased loss that are caused by the ripple of power supplied to an engine that is 30 driven and controlled by a power conversion device including a capacitor equipped with capacitance with which voltage fluctuations due to a supply voltage cannot be filtered, but which voltage fluctuations generated when switching operations can be filtered. switching elements of an inverter section are performed. SOLUTION OF THE PROBLEM
    To achieve the aforementioned objective, on an engine (4) according to the present invention, to allow the absorption of power fluctuations due to a supply voltage from an alternating current supply source (3) on one side of the engine ( 4), an inductance on the q-axis and an inductance on the d-axis that are defined in the equivalent circuit method of the dq axes are established so that the inductance on the q-axis is greater than the inductance on the d-axis of a predetermined amount or more.
    Specifically, a first aspect of the present invention addresses a motor that is driven and controlled by a power conversion device (2) that includes a converter section (11) configured to rectify the alternating current power of a power supply alternating current (3), an inverter section (13) that includes a plurality of switching elements (Su, Sv, Sw, Sx, Sy, Sz) and configured to perform switching operations of the switching elements (Su, Sv, Sw , Sx, Sy, Sz) to convert the output power of the converter section (11) into alternating current power at a predetermined frequency, and a - 25 capacitor (12a) mounted on the output side of the converter section (11) and equipped of a static capacitance with which the voltage fluctuations due to a supply voltage of the AC power supply (3) cannot be filtered, but the voltage fluctuations generated when 30 switching operations are carried out switching elements (Su, Sv, Sw, Sx, Sy, Sz).
    In the motor (4), the inductance on the q-axis is greater than an inductance on the d-axis of a predetermined amount or more to allow the filter of the power fluctuations due to the supply voltage of the AC power supply (3).
    With the aforementioned configuration, even when the capacitor (12a) has only a static capacitance with which voltage fluctuations due to the supply voltage of the AC power supply (3) cannot be filtered, voltage fluctuations can be absorbed on the engine side (4). That is, the motor (4) is configured so that the inductance on the q-axis on the motor (4) is greater than the inductance on the d-axis of a predetermined amount. Thus, power fluctuations due to voltage fluctuations can be stored as magnetic coenergy determined by a difference between the inductance on the q-axis and the inductance on the d-axis in the motor (4), and the power fluctuations can be filtered by engine (4). Therefore, an increase in engine vibration and noise (4) can be avoided, as well as an increase in loss such as copper loss and iron loss.
    The motor (4) of the first aspect of the present invention further includes a rotor (31) which includes a plurality of magnets (33) integrated in it, and the magnetic flux generated by the magnets (33) is a predetermined magnetic flux with which a voltage at the motor terminal it is equal to or less than the input voltage of the power conversion device (2) (a second aspect of the present invention).
    As in the first aspect of the present invention, when the inductance on the q-axis is greater than the inductance on the d-axis, the magnetic flux in the motor (4) increases. In a motor of the type permanent internal magnetic (IPM) in which the magnets (33) are placed inside the rotor (31), a magnetic flux is also generated due to the magnets (33) of the rotor (31), as well as the magnetic flux on the motor (4), and thus, problems on the rotor (31) arise, such as saturation of the magnetic flux and increased voltage at the motor terminal, etc. Thus, the performance of the motor (4) can be degraded, and when the voltage at the motor terminal exceeds the input voltage of the power conversion device (2), the motor (4) may lose speed and stop.
    On the contrary, due to the configuration of the motor (4), as described above, the magnetic flux generated by the magnets (33) has a predetermined value with which the voltage at the motor terminal is equal to or less than the input voltage of the inverter section. Thus, it is possible to prevent the voltage at the motor terminal from exceeding the input voltage of the power conversion device (2), while also preventing the saturation of the magnetic flux in the rotor (31). That is, as described above, even when the magnetic flux in the motor (4) is increased causing the inductance on the q-axis to be greater than the inductance on the d-axis by a predetermined amount or more, the problems caused can be solved by increasing the magnetic flux in the motor (4) by reducing the magnetic flux of the magnets (33) by a corresponding amount.
    Therefore, even when the capacitor (12a) has only the static capacitance with which the power fluctuations due to the supply voltage of the AC power supply (3) cannot be filtered, the increase in vibration, noise and loss of the motor (4) can be avoided without losing the motor function.
    In the motor of the first or second aspect of the present invention, in the rotor (31) which includes a plurality of magnets (33) integrated in it, the magnets (33) are arranged in positions in the radial direction of the rotor (31) so that a magnetic flux on the q-axis in the rotor (31) is not blocked by a magnetic resistance of the magnets (33) (a third aspect of the present invention).
    Thus, the blocking of the magnetic flux in the q-axis by the magnetic resistance of the magnets (33) is not caused by the magnetic flux in the q-axis generated by the stator side (21) and the magnetic flux generated by the magnets (33) in the rotor ( 31), 5 so that the magnetic flux on the q-axis can be increased. Therefore, the configuration of the first aspect of the present invention can be made without losing its function as a motor.
    Specifically, in the motor of the third aspect of the present invention, the magnets (33) are preferably arranged on the rotor (31), so that each of the parts of the magnets (33) that are closest to the center of the rotor axis (31) it is located at a distance equal to or less than 1/2 the thickness of a part of the rotor (31) that serves as a magnetic pole in the radial direction (a fourth aspect of the present invention). Thus, an area of entry / exit of the magnetic flux that is 1/2 of a surface area of a surface area of the magnetic pole of the rotor (31) and a magnetic flux passing through the surface on the rotor (31) must be equal between si, the saturation of the magnetic flux on the rotor (31) can be more reliable and more reduced, and the magnetic flux on the q-axis can be increased.
    According to any of the aspects first to fourth of the present invention, the rotor (31) which includes a plurality of magnets (33) integrated therein includes magnetic flow barrier sections (32b) configured to prevent a short circuit of a flow magnetic between the plurality of magnets (33), and the magnets (33) and the magnetic flux barrier sections (32b) are arranged along a magnetic flux 30 on the q-axis (a fifth aspect of the present invention).
    Thus, in a magnetic flux on the q axis, only a small amount of which leaks can be formed on the rotor (31), so that the magnetic flux on the q-axis can be increased. Therefore, the inductance on the q-axis can be reliably increased to be greater than the inductance on the d-axis, and the configuration of the first aspect of the present invention can be made more reliably.
    In addition, in the motor of any aspect of the first to the fifth of the present invention, in the rotor (31) which includes a plurality of magnets (33) integrated in it, the thickness of the magnets (33) in the radial direction of the rotor (31) is four times, or more, than an air gap between rotor 10 (31) and a stator (21) (a sixth aspect of the present invention).
    Thus, the magnetic flux on the d-axis on the rotor (31) is blocked, so that the magnetic flux on the d-axis can be reduced and the inductance on the d-axis on the motor (4) can be reduced. Therefore, with this configuration, the configuration of the first aspect of the present one can be made.
    Also, in any aspect of the first to sixth of the present invention, the magnets (33) are provided along a magnetic flux on the q-axis in the rotor (31) so that two or more of the magnets (33) are arranged in parallel in the radial direction of the rotor (31) (a seventh aspect of the present invention).
    Thus, the magnetic flux on the d-axis is reduced by the magnets (33) arranged in parallel in the radial direction on the rotor (31), and the magnetic flux on the q-axis is increased by the magnets (33) existing along the magnetic flux. on the q axis. Thus, the distance between the inductance on the q-axis and the inductance on the q-axis can be reliably increased, and power fluctuations can be more reliably absorbed in the motor 30 (4).
    An eighth aspect of the present invention relates to a system for driving an engine. Specifically, a system for driving the motor according to the eighth aspect of the present invention includes the power conversion device (2) and the motor (4) of any aspect of the first to the seventh of the present invention.
    With any of the above configurations, 5 even when power fluctuations due to a supply voltage cannot be absorbed on the side of the power conversion device (2), power fluctuations can be absorbed on the motor side (4), and the motor (4) can be started with low vibration, low noise and greater efficiency. ADVANTAGES OF THE INVENTION
    In the motor (4) according to the present invention, even when the capacitor (12a) has a static capacitance with which voltage fluctuations due to the supply voltage 15 of the AC power supply (3) cannot be filtered , but the voltage fluctuations generated when switching operations of the switching elements (Sv, Sw, Sx, Sy, Sz) can be filtered out, the power fluctuations can be absorbed on the motor side (4).
    Therefore, the motor (4) can be imagined, which can be driven with low vibration, low noise and greater efficiency than conventional motors.
    According to the second aspect of the present invention, even with the configuration of the first aspect of the present invention, the voltage at the motor terminal does not exceed the input voltage of the power conversion device (2). Thus, the motor (4) does not lose speed and can perform the normal rotation movement of the motor (4).
    According to the third aspect of the present invention, the magnetic flux on the q-axis in the rotor (31) can be increased without being blocked by the magnetic resistance of the magnets (33). Therefore, power fluctuations can be more reliably absorbed on the motor side (4) without losing function as an engine (4). Specifically, according to the fourth aspect of the present invention, the saturation of the magnetic flux on the q-axis of the rotor (31) can be more reliably reduced, so that the magnetic flux on the q-axis can be increased.
    According to the fifth aspect of the present invention, in the magnetic flux on the q axis, only a small amount of which leaks can be formed on the rotor (31), so that the magnetic flux on the q axis can be increased. Thus, the inductance on the q-axis can be increased, and a large amount of energy can be stored in the motor (4).
    According to the sixth aspect of the present invention, the magnetic flux on the d-axis on the rotor (31) can be reduced, so that the difference between the inductance on the q-axis and the inductance on the d-axis can be increased. Thus, a large amount of energy can be stored in the engine (4).
    According to the seventh aspect of the present invention, the magnetic flux on the q-axis can be increased while the magnetic flux on the d-axis on the rotor (31) is reduced. Thus, a large amount of energy can be stored in the motor (4), and power fluctuations can be filtered more reliably.
    With the system for driving the motor (1) of the eighth aspect of the present invention, a motor (4) can be imagined that can be driven with low vibration, low noise and greater efficiency than conventional motors. BRIEF DESCRIPTION OF THE DRAWINGS
    [FIG. 1] FIG. 1 is a circuit diagram illustrating a schematic configuration of a system for driving a motor according to an embodiment of the present invention.
    [FIG. 2] FIG. 2 is a cross-sectional view illustrating a schematic configuration of a three-phase motor.
    [FIG. 3] FIG. 3 shows waveform tables that schematically illustrate (A) a waveform when the power fluctuates, and (B) a waveform when the fluctuations are filtered by an engine.
    [FIG. 4] FIG. 4 is a graph showing the relationship between a multiple of the thickness of a magnet with respect to an air gap and the ratio of the difference between Lq and Ld to an ideal difference between Lq and Ld.
    [FIG. 5] FIG. 5 is a cross-sectional view illustrating a schematic configuration of an engine rotor according to another embodiment. DESCRIPTION OF ACHIEVEMENTS
    Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings. Note that the following realizations are established only for the purpose of preferred examples in nature, and are not intended to limit the scope, requests and use of the invention. —General System Configuration for the Motor Drive—
    FIG. 1 schematically illustrates a schematic configuration of a system for driving the motor (1) according to an embodiment of the present invention. The system for driving the motor (1) includes a power conversion device (2) that performs the power conversion, an alternating current power supply (3) that supplies power to the power conversion device 30 (2 ), and a three-phase AC motor (4) that is driven and controlled by the power conversion device (2).
    The power conversion device (2) includes a converter circuit (11) (the converter section), a capacitor circuit (12) including a capacitor (12a), and an inverter circuit (13) (an inverter section), and is configured to convert the alternating current power sent by the alternating current power supply (3) to drive 5 at a predetermined frequency and supplies power to the three-phase AC motor (4). Note that the three-phase AC motor (4) is provided, for example, to drive an existing compressor in a cooling circuit of an air conditioner.
    The converter circuit (11) is connected to the alternating current supply source (3), being configured to rectify an AC voltage. The converter circuit (11) is a diode bridge circuit including a plurality of diodes (D1-D4) (four diodes in this embodiment) connected together in a bridge arrangement, being connected to the alternating current supply source (3) .
    The capacitor circuit (12) is provided between the converter circuit (11) and the inverter circuit (13). The capacitor circuit (12) includes the capacitor (12a) formed by, for example, a film capacitor, etc. Capacitor (12a) 2 0 has a static capacitance with which only a ripple voltage (voltage fluctuations) is generated when the switching operations (which will be described later) of the switching elements (Su, Sv, Sw, Sx, Sy , Sz) of the inverter circuit (13) that are made can be filtered. That is, the ■ 25 capacitor (12a) is a small capacitance capacitor that cannot filter a voltage (voltage fluctuations due to a supply voltage), like the voltage shown in FIG. 3A, which has been rectified by the converter circuit (11).
    The inverter circuit (13) is connected to an output side of the converter circuit (11) in parallel with the capacitor (12a). The inverter circuit (13) includes the plurality of switching elements (Su, Sv, Sw, Sx, Sy, Sz) (for example, six switching elements in a three-phase inverter circuit) connected together in a bridge arrangement. That is, the inverter circuit (13) includes three switching legs, each including two switching elements connected in series, and on each of the switching legs, a midpoint of each of the switching elements (Su, Sv, Sw ) on an upper arm and one associated with the switching element (Sx, Sy, Sz) on a lower arm are connected to a stator coil (23) for each phase of the three-phase AC motor (4).
    The inverter circuit (13) converts the input voltage into a three-phase AC voltage at a predetermined frequency by means of on / off operations of the switching elements (Su, Sv, Sw, Sx, Sy, Sz) to supply the three-phase AC voltage to the three-phase AC motor (4). Note that in this embodiment, freewheeling diodes (Du, Dv, Dw, Dx, Dy, Dz) are connected to the switching elements (Su, Sv, Sw, Sx, Sy, Sz) respectively in an antiparallel manner.
    The power conversion device (2) includes a control circuit (14) for carrying out switching operations of the switching elements (Su, Sv, Sw, Sx, Sy, Sz) of the inverter circuit (13). The control circuit (14) is configured to produce on / off signals for the switching elements (Su, Sv, Sw, Sx, Sy, Sz) based on a Vs supply voltage from the AC power supply (3), a voltage Vdc of the capacitor circuit (12), currents iu, iv, and iw to be detected by the three-phase AC motor (4), and an angular speed ωm.
    The three-phase AC motor (4), which will be described in detail later, includes a stator (21) having an approximately columnar shape and a rotor (31) which is arranged inside the stator (21) and has an approximately cylindrical shape. Within the rotor (31), a plurality of magnets (33) are integrated. That is, the three-phase AC motor (4) is a synchronous motor of the interior permanent magnetic type (IPM - interior permanent magnet) in which the magnets (33) are integrated inside the rotor (31). —Configuration of the three-phase AC motor—
    As described above, when the capacitor (12a) in the capacitor circuit (12) is a small capacitance capacitor that can filter only a ripple voltage generated by the switching operations of the switching elements (Su, Sx, Sw, Sx, Sy, Sz ) of the inverter circuit (13), voltage fluctuations due to a supply voltage from the AC power supply (3) as the voltage shown in FIG. 3A cannot be filtered and therefore the voltage in a ripple state is allowed in the three-phase AC motor (4).
    Then, as the power to be supplied to the three-phase AC motor (4) is also in ripple, a 15 torque ripple appears, the rotation speed of the three-phase AC motor (4) fluctuates, and the vibration and noise generated in the three-phase AC motor (4). In addition, as the current flowing in the three-phase AC motor (4) is also in ripple, the copper loss generated in a three-phase AC motor coil (4) increases 20 due to the substantial increase in the effective current and the peak current , and also a magnetic flux generated in the three-phase AC motor (4) is in ripple to greatly increase iron loss.
    Opposed to this fact, according to the present invention, the three-phase AC motor (4) is configured to absorb power fluctuations. That is, to allow the three-phase AC motor (4) to absorb power fluctuations, the three-phase AC motor (4) is configured so that the inductance on the q-axis is greater than an inductance on the d-axis of a predetermined amount or more on the engine.
    First, it will be described below why power fluctuations can be absorbed by providing a difference between the inductance on the q-axis and the inductance on the d-axis in the three-phase AC motor (4) and causing a difference to be a predetermined quantity or more .
    When P is assumed to be an average required power and f is the energy input frequency, the required supply capacitance Wc for the ripple power filter can be expressed by: Wc = P / (2f) / 2 x pf. where pf indicates the ratio of the sum total of a difference between the power when the power exceeds an average value and the average power during a given period of time in relation to the total sum of the power during the given period of time. When the capacitance of the capacitor (12a) is zero, mp is about 0.07.
    Based on the above equation, in a common air conditioner, for example, when P = 1 [kW] and f = 50 [Hz], Wc = 0.35 [J] is obtained by replacing pf = 0.07.
    In this embodiment, the three-phase AC motor (4) is a synchronous motor of the permanent magnetic type inside in which the magnets (33) are integrated into the rotor (31), and thus has, in addition to the torque of the magnets (33), a reluctant torque generated by the inductance components of the stator coil. The reluctant torque is equal to the reluctant motor's magnetic coenergy, and the WL energy can be expressed by: WL = Pn x 1/2 x (Ld - Lq) x id x iq. If the WL energy that can be stored in the inductance components in the three-phase AC motor (4) has a relationship with the required storage capacitance Wc which is expressed by: WL ≥ Wc, the power fluctuations can be absorbed by the three-phase AC motor ( 4).
    For example, in a system where the average required power is P = 1 [kW], when the voltage of the motor is assumed to be 150 [V], the motor current phase is 30 [degrees], the efficiency motor current is 90 [%], the motor phase factor is 1, and the number of pole pairs is 2, the motor current I can be expressed by:

    The current on the d-axis and the current on the q-axis when. the motor current is represented in terms of direct current are, respectively:

    Thus, the following equation holds. WL = 2 x 1/2 x (Ld - Lq) x 3.7 x 6.42 ≥ 0.35 Therefore, the following equation applies. | Ld - Lq | ≥ 0.147 [H]
    That is, when the difference between the inductance on the q-axis Lq and the inductance on the d-axis Ld is as described above, the power fluctuations can be absorbed by the three-phase AC motor (4) under the conditions mentioned above. Thus, as shown in FIG. 3B, the power in the three-phase AC 20 motor (4) can be filtered. The term "to filter" here means that the power fluctuations are within a range of ± 10%, and if efficiency, etc., is considered, it is preferable to obtain fluctuations of 5% or less.
    A specific configuration of the three-phase AC motor 25 (4) that satisfies the above conditions will be described below with reference to FIG. two.
    As described above, the three-phase AC motor (4) includes the stator (21) having an approximately cylindrical shape and the rotor (31) which is disposed within the stator 30 (21) and has an approximately columnar shape. The stator (21) includes a stator core (22) including a plurality of stacked metal plates, and a stator coil (23) that encloses a part of the stator core (22). The stator core (22) includes a rear core section (22a) having an approximately cylindrical shape, with a plurality of toothed sections (22b) provided on one side of the inner circumference of the rear core section (22a), so that each one of the toothed sections (22b) protrudes inward. The stator coil (23) surrounds the toothed sections (22b).
    FIG. 2 illustrates, as an example, the stator (21) of a concentrated winding type. However, the stator (21) is not limited to this type, but it can be a stator of a distributed winding type, where a stator coil is wound in a plurality of toothed sections together. In the example of FIG. 2, the number of slots in the stator (21) is six. However, the number of slots is not limited to six, but it can be seven or more, or five or less.
    The rotor (31) includes a rotor core (32) having an approximately cylindrical shape so that an axis of rotation (34) passes through the interior of the rotor (31) and the plurality of magnets (33) that are in the slots (32a ) of the rotor core (32), each of which is formed to have an approximately rectangular parallelepiped shape. Eight slots (32a) are formed in the rotor core (32) and arranged in an approximately rectangular pattern that surround the axis of rotation (34) when viewed in the direction of the axis of the axis of rotation (34). The slots (32a) are formed so that two of the slots (32a) are arranged in parallel and each of the slots (32a) forms a string of a circular arc of the rotor core (32) having an approximately cylindrical shape. Each of the slots (32a) is formed to be large enough to hold one of the associated magnets (33), and to pass through the rotor core (32) in the direction of the axis. Note that, as will be described later, the magnetic flux barrier sections (32b) are provided in both extreme parts of each of the slots (32a) to be curved outwards in the radial direction of the rotor core (32).
    As described above, two magnets (33) are arranged in parallel in the radial direction of the rotor (31), so that the magnetic flux on the q-axis can be further increased by the two magnets (33) while the magnetic flux on the d-axis is reduced.
    In addition, as shown in FIG. 2, the magnets (33) are arranged so that each of the magnets (33) forms a string of a circular arc from the rotor core (32). Thus, the magnets (33) are arranged along the magnetic flux on the q axis, so that the leakage of the magnetic flux 15 can be reduced and the magnetic flux on the q axis can be increased.
    The slots (32a) are provided in positions that do not saturate the flow of the q-axis in the rotor (31). That is, opposite to a conventional motor, where the magnets 20 are placed close to the outer circumference of a stator core, the magnets (33) are arranged in positions on the rotor core (32) that do not cause a situation where the thickness of the parts of the rotor core (32) located closer to the outer circumference of the rotor so that the magnets 25 (33) are increased to block the magnetic flux on the q-axis with the magnetic resistance of the magnets (33) on the rotor (31) .
    Specifically, the magnets (33) are preferably arranged in the rotor core (32) so that each part of the magnets (33) provided more than 30 near the center of the rotor (31) is located at a distance equal to or less than 1 / 2 the thickness of a part of the rotor (31) that serves as a magnetic pole in the radial direction. Note that the part of the rotor (31) that serves as a magnetic pole corresponds to the core of the rotor (32) in this embodiment.
    With the aforementioned configuration, saturation of the magnetic flux in the rotor (31) can be avoided, and thus, the magnetic flux in the q-axis can be increased, 5 guaranteeing the motor function.
    When viewed from the direction of the axis of the rotation axis (34), the magnetic flux barrier sections (32b) are provided to prevent short-circuiting the magnetic fluxes of the magnets (33) stored in the slots (32a) in 10 both extreme parts of each of the slots (32a).
    Specifically, the end parts of each of the slots (32a) include parts that are folded out in the radial direction of the rotor core (32) and the folded parts function as the magnetic flux barrier sections (32b). Note 15 that the magnetic flow barrier sections (32b) are not limited to the parts of the slots (32a), but may consist of some other member that can prevent the leakage of the magnetic flow, and as another option, each of the sections Magnetic flow barrier (32b) can include a plurality of parts.
    Thus, as shown in FIG. 2, each of the slots (32a) in which the magnets (33) are stored and the members of the magnetic flux barrier sections (32b) are formed to have a circular arc shape in the rotor core 25 (32), way that the magnetic flux on the q-axis can be increased.
    In this case, the magnetic flux on the q-axis in the three-phase AC motor (4) is substantially ideally determined by a space, that is, an air gap g between the rotor (31) and the stator (21), while the magnets (33) are configured to have a predetermined thickness relative to the air gap g, considering that the magnetic flux on the d-axis decreases with the increase in the thickness of the magnets (33). Specifically, as shown in FIG. 4, as a multiple of the thickness of the magnets (33) relative to the air gap g, the difference between the inductance on the q-axis and the inductance on the d-axis (the ratio of a difference in inductance to an ideal difference 5 in inductance when the thickness of the magnets (33) relative to the air gap g is infinitely increased in FIG. 4). Therefore, the thickness of the magnets (33) is determined so that the difference in inductance becomes a value with which power fluctuations can be absorbed by the three-phase AC motor (4). Specifically, when the thickness of the magnets (33) is four times greater, or more, than the air gap g, a value equal to or greater than 80% of the ideal difference can be obtained and, therefore, the thickness of the magnets (33) is preferably four times or more than the air gap g.
    The voltage at the Va motor terminal on the three-phase AC motor (4) and the magnetic flux (p in the motor are expressed respectively by:

    As understood from the above equations, when the difference between Lq and Ld increases as described above, the magnetic flux ip in the motor also increases. Thus, when the magnetic flux <p is combined with the magnetic flux <pa generated by the magnets (33) of the rotor (31), saturation of the magnetic flux is caused and an increase in the voltage at the Va motor terminal. When the voltage at the Va motor terminal, it exceeds the input voltage of the inverter section (13), the three-phase AC motor (4) may lose speed and stop. Note that ld in 30 each of the equations is a negative value, and even when Ld is reduced, cp increases.
    Therefore, the rotor (31) is configured so that the magnetic flux cpa generated by the magnets (33) of the rotor (31) is a magnetic flux with which the voltage at the Va motor terminal is equal to or less than the input voltage of the inverter section (13). Specifically, a magnet is selected that generates this 5 cpa magnetic flux, and the slots (32a) to be provided in the rotor core (32) of the rotor (31) are formed to be slightly larger in relation to the magnets (33) ( to have a dimension that gives a marginal space in relation to the thickness of the magnets (33)).
    As described above, the slots (32a) are formed to be slightly larger with respect to the magnets (33), so that an air layer provided between each of the magnets (33) and the rotor core (32) serves as magnetic resistance, thus resulting in the reduction of the magnetic flow cpa 15 generated by the magnets (33). In addition, as described above, as the slots (32a) are formed to be slightly larger with respect to the magnets (33), even when the dimension of the magnets (33) varies in the direction of the thickness, the magnets (33) can be stored in the slots (32a). Thus, it is not necessary to accurately use the processed magnets, so that production costs can be reduced.
    Note that, as described above, the motor can be configured not so that the magnetic flux cpa generated by the magnets (33) is not made as a magnetic flux 25 with which the voltage at the motor terminal Va is equal or less at the input voltage of the inverter circuit (13), but so that the sum of the magnetic flux cpa and the magnetic flux by an armature reaction due to the inductance on the q-axis and the inductance on the d-axis is a desired magnetic flux with o 3 0 the voltage at the Va motor terminal is equal to or less than the input voltage of the inverter circuit (13). —Advantages Advantages—
    Based on the above, with the aforementioned configuration, the three-phase AC motor (4) that is driven and controlled by the power conversion device (2) is configured so that the inductance on the q-axis is greater than the inductance on the axis -d of a predetermined amount or more to make the three-phase AC motor (4) absorb power fluctuations due to a supply voltage that cannot be filtered by the capacitor (12a) in the power conversion device (2). Thus, the 10 power fluctuations in the three-phase AC motor (4) can be reduced. Therefore, the increase in vibrations, noise and loss in the three-phase AC motor (4) due to power fluctuations can be avoided.
    Specifically, in the three-phase AC motor (4), the magnets (33) are arranged in parts of the rotor (31) 15 located closer to the axis of rotation (34), so that the magnetic flux on the q-axis is not blocked by the magnetic resistance of the magnets (33) in the rotor (31), and thus, the aforementioned difference between the inductance on the q-axis and the inductance on the d-axis can be realized, while 20 is avoided the saturation of the magnetic flux in the rotor ( 31). In particular, the saturation of the magnetic flux in the rotor (31) can be greatly reduced by arranging the magnets (33) so that each of the parts of the magnets (33) closest to the center of the rotor (31) is located at a distance 2 5 equal to or less than 1/2 the thickness of a part of the rotor (31) that serves as a magnetic pole in the radial direction, and thus the reduction in the motor performance due to the saturation of the magnetic flux can be avoided, and the magnetic flux on the q-axis can be increased.
    In the rotor (31), each of the magnets (33) and the members of the magnetic flux barrier sections (32b) are provided to have a circular arc shape in the rotor core (32), so that the magnetic flux in the q-axis can form. Thus, the difference between the inductance on the q-axis and the inductance on the d-axis can be obtained more reliably, and the power fluctuations in the three-phase AC motor (4) can be filtered more reliably.
    In addition, the magnets (33) are provided so that two of the magnets (33) are arranged in parallel in the radial direction of the rotor (31), and thus, the magnetic flux on the q-axis can be increased while the magnetic flux on the d-axis can be reduced.
    Also, the thickness of the magnets (33) is made to be four times or more that of the air gap g between the rotor (31) and the stator (21), and thus, the difference between the inductance on the q-axis and the inductance on the d-axis can be increased more reliably.
    In the aforementioned configuration, the magnetic flux <pa generated by the magnets (33) is made to be a value with which the voltage at the motor terminal is equal to or greater than the input voltage of the power conversion device (2), in a way that the saturation of the magnetic flux in the rotor (31) is avoided and a situation in which the voltage at the motor terminal exceeds the input voltage of the power conversion device (2) to make the three-phase AC motor (4) can be avoided ) lose speed. << Other Achievements >>
    The aforementioned realization can have the following configuration.
    In the aforementioned embodiment, as an alternating current power source, a single phase alternating current power source (3) is used. However, the present invention is not limited to this, a three-phase alternating current power supply can be used. In this case, of course, a six-diode converter circuit must be formed.
    In the aforementioned embodiment, the magnets (33) are formed in such a way that each of the magnets (33) has a rectangular parallelepiped shape. However, the present invention is not limited to this. The magnets (33) can be formed so that each of the magnets (33) has a circular arc shape to be arranged along an associated filter capacitor (2b) and one of the associated magnetic flux barrier sections ( 32b). Also, as shown in FIG. 5, in a rotor (41), the plurality of magnets (33) can be provided in the slots (32a) and the magnetic flux barrier sections (32b) to have a circular arc shape.
    In the aforementioned embodiment, the magnets (33) are formed so that each of the magnets (33) has a rectangular parallelepiped shape with uniform thickness. However, the present invention is not limited to this. The magnets (33) can be formed so that a part of each of the magnets (33) that is likely to be demagnetized is thicker. In this case, for example, the magnets (33) are formed so that a part of each of the magnets (33) that is likely to be demagnetized by the magnetic field generated by the stator (21) is thicker. In addition, the coercive magnetic force of the magnets (33) does not have to be uniform. In this case, the configuration in which demagnetization hardly occurs can be obtained by increasing the coercive magnetic force of a part of each of the magnets (33) that is likely to be demagnetized. On the other hand, the coercive magnetic force of a part of each of the magnets (33) that is difficult to demagnetize is reduced to increase the density of the residual magnetic flux. Thus, the density of a magnetic flux of the magnets (33) can be increased, and the motor torque can be increased. INDUSTRIAL APPLICABILITY
    As described above, the present invention is useful, particularly when the motor is driven and controlled by a power conversion device including a capacitor with a static capacitance with which voltage fluctuations due to a supply voltage cannot be filtered, but voltage fluctuations generated when switching an inverter circuit can be filtered. DESCRIPTION OF REFERENCE CHARACTERS
    1 Motor drive system 2 Power conversion device 3 AC power source 4 Three-phase AC motor (Motor) 11 Converter circuit (Converter section) 12a Capacitor 13 Inverter circuit (Inverter section) 21 Stator 31, 41 Rotor 32 Rotor core - 32b Magnetic flow barrier section 33 Magneto '25 g Air gap.
    权利要求:
    Claims (8)
    [0001]
    1. SYNCHRONOUS INTERNAL PERMANENT MAGNET MOTOR (4), comprising: - a stator (21) having an approximately columnar shape and including a stator core (22) with a central rear section (22a) and a plurality of toothed sections (22b ) provided on one side of the inner circumference of the central rear section (22a) so that each of the toothed sections (22b) protrudes inwardly; - a stator coil (23) wound around at least one of the toothed sections of the stator (21); and - a rotor (31) which is disposed within the stator (21) and including a rotor core (32) having an approximately cylindrical shape, so that an axis of rotation (34) passes through the interior of the rotor (31) , characterized by - a plurality of magnets (33) which are arranged in parallel and along a radial direction of the rotor (31) along a flow of a magnetic flux of axis q and which are stored in openings (32a) of the core of the rotor (32), so that the inductance of the q axis is greater than the inductance of the d axis by a predetermined amount or more, while saturation of the magnetic flux in the rotor is avoided to allow smoothing of energy fluctuations due to the source power supply to the AC power source (3).
    [0002]
    2. MOTOR according to claim 1, characterized in that a magnetic flux generated by the magnets (33) is a predetermined magnetic flux with which a motor terminal voltage is equal to or less than the input voltage of the power conversion device ( two).
    [0003]
    3. MOTOR according to claim 1, characterized in that the magnets (33) are arranged in positions in the radial direction of the rotor (31), so that a magnetic flux on the q axis in the rotor (31) is not blocked by a resistor the magnets (33).
    [0004]
    4. MOTOR, according to claim 3, characterized in that the magnets (33) are arranged in the rotor (31), so that each part of the existing magnets (33), closer to the center of the rotor axis (31) , is located at a distance equal to or less than 1/2 the thickness of a part of the rotor (31) that serves as a magnetic pole in the radial direction.
    [0005]
    5. MOTOR according to claim 1, characterized in that the rotor (31) includes magnetic flux barrier sections (32b) configured to prevent a magnetic flux short-circuit between the plurality of magnets (33) and the magnets ( 33) and the magnetic flux barrier sections (32b) are arranged along the flux of a magnetic flux on the q axis.
    [0006]
    6. MOTOR, according to claim 1, characterized by the thickness of the magnets (33) in the radial direction of the motor (31) being four times greater, or more, than an air gap between the rotor (31) and a stator ( 21).
    [0007]
    7. MOTOR according to claim 1, characterized in that two or more of the magnets (33) are arranged in parallel in the radial direction of the rotor (31).
    [0008]
    8. ENGINE DRIVING SYSTEM, comprising: - a power conversion device (2) that includes a converter section (11) configured to rectify the alternating current power of an alternating current power source (3), a inverter section (13) that includes a plurality of switching elements (Su, Sv, Sw, Sx, Sy, Sz) and configured to perform switching operations of the switching elements (Su, Sv, Sw, Sx, Sy, Sz) to convert the output power of the converter section (11) in alternating current power at a predetermined frequency, characterized by a capacitor (12a) provided on the output side of the converter section (11) and equipped with a static capacitance 5 with which the fluctuations of voltage due to an input voltage of the power of the AC power source (3) cannot be smoothed, but that the voltage fluctuations caused when the switching operations of the switching elements (Su, Sv, Sw, Sx, Sy, Sz) are carried out can be 10 smoothed; and - the internal permanent magnet synchronous motor (4), as defined in claim 1.
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    同族专利:
    公开号 | 公开日
    CN102511119A|2012-06-20|
    JP4821902B2|2011-11-24|
    JP2011078195A|2011-04-14|
    AU2010302064A1|2012-03-29|
    EP2485369A1|2012-08-08|
    EP2485369A4|2017-06-14|
    US20120187877A1|2012-07-26|
    AU2010302064B2|2014-03-27|
    BR112012006447A2|2017-07-25|
    EP3883095A1|2021-09-22|
    KR101326469B1|2013-11-07|
    KR20120089672A|2012-08-13|
    US9013136B2|2015-04-21|
    WO2011040020A1|2011-04-07|
    CN102511119B|2014-07-30|
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-04-02| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2019-12-24| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|
    2020-04-07| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-10-27| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 27/10/2020, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009226418A|JP4821902B2|2009-09-30|2009-09-30|Motor and motor drive system including the same|
    JP2009-226418|2009-09-30|
    PCT/JP2010/005872|WO2011040020A1|2009-09-30|2010-09-29|Motor and drive system provided therewith|
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