Electrical Equipment

Abstract

Provided is an electrical device that can suppress the generation of impact noise and the decrease in charging efficiency caused by rotor vibration during AC charging. [Solution] The electrical device includes an electricity storage device, a rotating electric machine (16(M)), and a power control unit. The power control unit includes a third full-bridge circuit connected across both ends of a β-phase first coil (33(β1)) of the rotating electric machine (16), and a fourth full-bridge circuit connected across both ends of a β-phase second coil (34(β2)). The β-phase first coil (33(β1)) and the β-phase second coil (34(β2)) form an AC input phase connected to an AC power supply connection member. The rotating electric machine (16) includes a stator core (42) having slots (43) formed therein in which coils (β1, β2) are arranged, each having a different combination of winding numbers at the first and second poles that form a pole pair (north and south poles).

Description

[Technical Field]

[0001] The present invention relates to electrical equipment. [Background technology]

[0002] In recent years, research and development has been conducted into charging mobility vehicles equipped with secondary batteries that contribute to energy efficiency, in order to ensure that more people have access to affordable, reliable, sustainable and advanced energy. Conventionally, there is known an electric vehicle that converts AC power supplied from an external power source into DC power by, for example, combining a multi-phase stator winding of a motor with a multi-phase bridge circuit using switching elements (see, for example, Patent Document 1). In this electric vehicle, the rotor position (rotation angle) is controlled to a predetermined position when the motor is stopped in order to suppress torque generation in the motor during AC charging from the external power source and to maximize inductance. Further, conventionally, there is known a motor in which the number of turns of two windings connected in series at each of the north and south poles of the stator magnetic poles is set to be the same (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-65808 [Patent Document 2] Japanese Patent Publication No. 2020-25377 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in technology related to charging and supplying power to mobility vehicles equipped with secondary batteries, it is necessary to suppress the occurrence of gear impact noise, or so-called gear rattle noise, caused by the torque generated by the motor during AC charging from an external power source, while suppressing a decrease in charging efficiency due to an increase in current distortion, etc. For example, when the rotor position is controlled to a predetermined position when the motor is stopped, as in the electric vehicle of the above-mentioned prior art, it may be difficult to properly control the rotor position due to factors such as the driver's intention, the surrounding environment, and other vehicle controls. Furthermore, even when the rotor position is set to a predetermined position, vibration of the rotor occurs depending on the frequency of the charging current during AC charging, which may cause gear rattle noise to be generated by the gear connected to the rotor.

[0005] In order to solve the above problems, the present application aims to suppress the generation of impact noise and the decrease in charging efficiency caused by rotor vibration during AC charging, thereby contributing to improved energy efficiency. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the above object, the present invention employs the following aspects. (1): An electric device (e.g., electric device 10 in the embodiment) according to one aspect of the present invention includes: an electric storage device (e.g., electric storage device 11 in the embodiment); a rotating electric machine (e.g., rotating electric machines 16(M), 16A, 16B, 16C in the embodiment) having a rotor (e.g., rotor 41 in the embodiment) and a plurality of coils (e.g., β-phase first coil 33 (β1), β-phase second coil 34 (β2), α-phase first coil 23 (α1), and α-phase second coil 24 (α2) in the embodiment); a power control unit (e.g., power control unit 10a in the embodiment) connected to the rotating electric machine and the electric storage device and controlling power exchange between the electric storage device and the rotating electric machine; and an AC power supply connection member (e.g., AC power supply connection portion 15 in the embodiment) connecting the rotating electric machine and an external AC power supply. The rotary electric machine includes a first full bridge circuit (e.g., a third full bridge circuit 13a in the embodiment) connected to both ends of a first coil (e.g., a β-phase first coil 33 (β1) in the embodiment) and a second coil (e.g., a β-phase second coil 34 (β2) in the embodiment) that form a predetermined phase (AC input phase) connected to the AC power supply connecting member among the plurality of coils, and a second full bridge circuit (e.g., a fourth full bridge circuit 13b in the embodiment) connected to both ends of the second coil, and the rotary electric machine includes a stator core (e.g., a stator core 42 in the embodiment) in which slots (e.g., slots 43 in the embodiment) are formed in which the first coil and the second coil are arranged, the first pole and the second pole forming a pole pair having different combinations of winding numbers.

[0007] (2) In the electric device described in (1) above, the first coil and the second coil may be arranged in the slots of the stator core that face each other across a central axis.

[0008] (3): In the electrical device described in (2) above, the first coil may be arranged in a first slot (e.g., the first slot SL1 and the second slot SL2 in the embodiment) and the second slot (e.g., the third slot SL3 and the fourth slot SL4 in the embodiment), which are the slots that face each other across the central axis of the stator core, and the second coil may be arranged in the first slot and the second slot.

[0009] (4): In the electric device described in any one of (1) to (3) above, the combination of the number of turns of the first coil and the second coil at the first pole and the second pole of all pole pairs of the stator core may be the same.

[0010] (5) In the electric device described in (4) above, the predetermined phase may be an AC input phase that converts input AC power into output DC power.

[0011] (6): In the electric device described in (5) above, the power control unit includes a first circuit breaker (e.g., a third circuit breaker 35 in the embodiment) connected between one end of the first coil and the first full-bridge circuit, a second circuit breaker (e.g., a fourth circuit breaker 36 in the embodiment) connected between one end of the second coil and the second full-bridge circuit, and a third coil (e.g., an α-phase first coil 23 (α1) in the embodiment) and a fourth coil (e.g., an α-phase second coil 24 (α2) in the embodiment) forming DC conversion phases for converting DC power among the plurality of coils. In contrast, the power supply may include a third full bridge circuit (for example, the first full bridge circuit 12a in the embodiment) connected to both ends of the third coil, a fourth full bridge circuit (for example, the second full bridge circuit 12b in the embodiment) connected to both ends of the fourth coil, a third circuit breaker (for example, the first circuit breaker 25 in the embodiment) connected between the positive electrodes of the third full bridge circuit and the fourth full bridge circuit, and a fourth circuit breaker (for example, the second circuit breaker 26 in the embodiment) connected between the negative electrodes of the third full bridge circuit and the fourth full bridge circuit. [Effects of the Invention]

[0012] According to the above (1), the combination of the number of turns of the first coil and the second coil connected to the external AC power supply is different for the first pole and the second pole that form a pole pair in the stator core, so that even when current is passed in reverse phase during parallel connection, the magnetic fluxes are prevented from canceling each other out. This makes it possible to generate an inductance larger than the leakage inductance, and by suppressing current ripple and distortion, etc., charging efficiency can be improved.

[0013] In the case of (2) above, the first coil and the second coil are arranged in slots facing each other across the central axis of the stator core, so that even when current is supplied in reverse phase during parallel connection, a magnetic flux distribution that cancels out the torque on the rotor can be generated. By suppressing the torque generation of the rotating electric machine during AC charging, it is possible to suppress the generation of impact noises such as gear rattles caused by torque pulsation.

[0014] In the case of (3) above, by placing the first coil in the first slot and the second coil in the second slot, the inductance can be increased, and current ripple, distortion, etc. can be further suppressed.

[0015] In the case of (4) above, for example, the number of turns of the first coil and the second coil can be made the same for the entire stator core by having a correspondence relationship in which the combination of the number of turns of the first pole and the second pole is reversed, etc. This makes it possible to suppress the generation of torque in the rotating electric machine during AC charging, and to make the back electromotive waveform of each coil when the rotating electric machine is driven the same as when the number of turns of the first coil and the second coil are the same for each of the first pole and the second pole.

[0016] In the case of (5) above, charging efficiency can be improved by suppressing current ripples and distortions while suppressing the generation of impact noises such as gear rattles caused by torque pulsations of the rotating electric machine during AC charging.

[0017] In the case of (6) above, when the rotating electric machine is driven by the power storage device, the power control unit can function as an inverter of a multiple full-bridge circuit. When the power storage device is being charged with AC from an external AC power source, the combination of the third coil and the fourth coil and the third full-bridge circuit and the fourth full-bridge circuit can function as an isolated bidirectional DC-DC converter. For example, in the case of voltage boost operation during AC charging, rapid charging can be performed for a power storage device whose voltage is higher than the charging voltage from the external AC power source. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram showing a configuration of an electrical device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a modeled configuration diagram of each full-bridge circuit and a rotating electric machine in the electric device according to the embodiment of the present invention. [Figure 3] FIG. 2 is a block diagram showing the functional configuration of an electronic control unit during AC charging in the electric device according to the embodiment of the present invention. [Figure 4] FIG. 3 is a circuit diagram showing an example of a current flow in a parallel mode during AC charging in the electric device according to the embodiment of the present invention. [Figure 5] FIG. 4 is a modeled configuration diagram of a rotating electric machine according to a first modified example of an embodiment of the present invention. [Figure 6] FIG. 10 is a modeled configuration diagram of a rotating electric machine according to a second modified example of an embodiment of the present invention. [Figure 7] FIG. 10 is a modeled configuration diagram of a rotating electric machine according to a third modified example of an embodiment of the present invention. [Figure 8] FIG. 10 is a configuration diagram showing an example of distributed winding of a rotating electric machine according to a third modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an electric device according to an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a diagram showing the configuration of an electric device 10 according to an embodiment. Fig. 2 is a diagram showing the modeled configuration of each of the full-bridge circuits 12a, 12b, 13a, and 13b and the rotating electric machine 16 in the electric device 10 according to the embodiment. The electrical device 10 of the embodiment is mounted on, for example, an electric vehicle, an electric moving body, an electric machine, a power supply device, etc. Examples of the electric vehicle include an electric car equipped with a rotating electric machine as a power source, a saddle-ride vehicle, a kick scooter, a hybrid vehicle combining a rotating electric machine with an internal combustion engine, and a fuel cell vehicle combining a power storage device with a fuel cell. Examples of the electric moving body include a robot, an aircraft, and a surface or underwater moving body. Examples of the electric machine include construction machinery equipped with a rotating electric machine as a power source. Examples of the power supply device include a stationary or mobile power supply device that discharges and charges a power storage device.

[0020] (Electrical Equipment) 1 and 2, an electrical device 10 of the embodiment includes, for example, a power storage device 11, a first power conversion unit 12 and a second power conversion unit 13, a DC power supply connection unit 14 and an AC power supply connection unit 15, a rotating electrical machine 16(M), a gate drive unit 17, and an electronic control unit 18. Note that, for example, the first power conversion unit 12 and the second power conversion unit 13, the DC power supply connection unit 14 and the AC power supply connection unit 15, the gate drive unit 17, and the electronic control unit 18 configure a power control unit 10a.

[0021] The power storage device 11 is connected to a first power conversion unit 12 and a second power conversion unit 13, which will be described later. The power storage device 11 includes, for example, a plurality of battery cells connected in series or in parallel. Each battery cell is, for example, a secondary battery such as a lead-acid battery, a lithium-ion battery, a nickel-metal hydride battery, or an all-solid-state battery, a capacitor such as an electric double-layer capacitor, or a composite battery that combines a secondary battery and a capacitor. Each battery cell is repeatedly charged and discharged. The power storage device 11 exchanges power with the rotating electric machine 16 via the power control unit 10a. The power storage device 11 is charged by an external power source (an external DC power source and an external AC power source).

[0022] The first power conversion unit 12 includes a first full-bridge circuit 12a and a second full-bridge circuit 12b. Each of the first full-bridge circuit 12a and the second full-bridge circuit 12b includes a so-called H-bridge circuit formed by a plurality of switching elements bridge-connected in two phases. Each switching element is a transistor such as a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) made of silicon carbide (SiC) or an IGBT (Insulated Gate Bipolar Transistor). Each switching element is, for example, an N-channel MOSFET. The switching elements are, for example, pairs of transistors that form the high-side arm and low-side arm element units 21a and 21b of each phase. The pairs of transistors in each element unit 21a and 21b are, for example, connected in parallel. Each full-bridge circuit 12a, 12b may include a rectifying element such as a free wheel diode connected in parallel in the forward direction from the emitter to the collector between the collector and emitter of each transistor.

[0023] The first power conversion unit 12 includes, for example, a first switch 22 connected between midpoints Q2 and Q3 of the first and second full-bridge circuits 12a and 12b. The midpoint Q2 of the first full-bridge circuit 12a is, for example, a connection point between the high-side arm element unit 21a (a2H) and the low-side arm element unit 21b (a2L), which are connected in series in the second phase of the first and second phases of the two phases of the first full-bridge circuit 12a. For example, the midpoint Q2 is a connection point between the source of the high-side arm element unit 21a (a2H) and the drain of the low-side arm element unit 21b (a2L). The midpoint Q3 of the second full-bridge circuit 12b is, for example, a connection point between the high-side arm element unit 21a (a3H) and the low-side arm element unit 21b (a3L), which are connected in series in the first phase of the first and second phases of the two phases of the second full-bridge circuit 12b. For example, the midpoint Q3 is the connection point between the source of the element portion 21a (a3H) of the high-side arm and the drain of the element portion 21b (a3L) of the low-side arm.

[0024] The first switch 22 is, for example, a bidirectional switch formed by two switching elements. Each switching element is a transistor such as a MOSFET or an IGBT, for example, an N-channel MOSFET. The first switch 22 includes, for example, two transistors connected in anti-series. The two transistors are connected in series in opposite directions, for example, by connecting their sources to each other. The first switch 22 switches between conducting and blocking the current between the midpoints Q2 and Q3 by turning on (conducting) and off (blocking) the two transistors. Each transistor may include a rectifying element such as a free wheel diode connected in parallel in the forward direction from the emitter to the collector between the collector and the emitter.

[0025] The first power conversion unit 12 is connected to an α-phase first coil 23 (α1) and an α-phase second coil 24 (α2) of a rotating electric machine 16 (described later). The α-phase first coil 23 is connected between midpoints Q1 and Q2 of a first full-bridge circuit 12a. The α-phase second coil 24 (α2) is connected between midpoints Q3 and Q4 of a second full-bridge circuit 12b. The midpoint Q1 of the first full-bridge circuit 12a is, for example, a connection point between a high-side arm element unit 21a (a1H) and a low-side arm element unit 21b (a1L) that are connected in series in the first phase of the first full-bridge circuit 12a. For example, the midpoint Q1 is a connection point between a source of the high-side arm element unit 21a (a1H) and a drain of the low-side arm element unit 21b (a1L). The midpoint Q4 of the second full-bridge circuit 12b is, for example, a connection point between the high-side arm element unit 21a (a4H) and the low-side arm element unit 21b (a4L), which are connected in series in the second phase of the second full-bridge circuit 12b. For example, the midpoint Q4 is a connection point between the source of the high-side arm element unit 21a (a4H) and the drain of the low-side arm element unit 21b (a4L).

[0026] The first power conversion unit 12 includes a first circuit breaker 25 connected between the positive electrodes of the first full bridge circuit 12a and the second full bridge circuit 12b, and a second circuit breaker 26 connected between the negative electrodes of the first full bridge circuit 12a and the second full bridge circuit 12b. Each of the first and second switchgears 25 and 26 is, for example, a contactor, and switches on (conducting) and off (disconnecting) the connection between the first full-bridge circuit 12a and the second full-bridge circuit 12b.

[0027] The first power conversion unit 12 includes, for example, a capacitor 27 connected between the positive and negative poles. The capacitor 27 smoothes voltage fluctuations that occur due to the switching operation of each switching element of the first power conversion unit 12 between on (conduction) and off (cutoff). The first power conversion unit 12 includes, for example, a first current sensor 28a arranged between the α-phase first coil 23 (α1) and the midpoint Q2, a second current sensor 28b arranged between the α-phase second coil 24 (α2) and the midpoint Q4, and a third current sensor 28c arranged between the storage device 11 and the first power conversion unit 12. For example, the first current sensor 28a detects the current flowing through the α-phase first coil 23 (α1), and the second current sensor 28b detects the current flowing through the α-phase second coil 24 (α2). The third current sensor 28c detects the current flowing between the first power conversion unit 12 and the power storage device 11.

[0028] The second power conversion unit 13 includes a third full-bridge circuit 13a and a fourth full-bridge circuit 13b. Each of the third full-bridge circuit 13a and the fourth full-bridge circuit 13b includes a so-called H-bridge circuit formed by, for example, a plurality of switching elements bridge-connected in two phases. Each switching element is, for example, a MOSFET such as SiC or a transistor such as IGBT. Each switching element is, for example, an N-channel MOSFET. The switching elements are, for example, pairs of transistors that form the high-side arm and low-side arm element units 31a, 31b of each phase. The pairs of transistors in each element unit 31a, 31b are, for example, connected in parallel. Each of the full-bridge circuits 13a and 13b may include a rectifying element such as a free wheel diode connected in parallel in the forward direction from the emitter to the collector between the collector and emitter of each transistor.

[0029] The second power conversion unit 13 includes, for example, a second switch 32 connected between midpoints R2 and R3 of the third and fourth full-bridge circuits 13a and 13b. The midpoint R2 of the third full-bridge circuit 13a is, for example, a connection point between the high-side arm element unit 31a (b2H) and the low-side arm element unit 31b (b2L), which are connected in series in the second phase of the first and second phases of the two phases of the third full-bridge circuit 13a. For example, the midpoint R2 is a connection point between the source of the high-side arm element unit 31a (b2H) and the drain of the low-side arm element unit 31b (b2L). The midpoint R3 of the fourth full-bridge circuit 13b is, for example, a connection point between the high-side arm element unit 31a (b3H) and the low-side arm element unit 31b (b3L), which are connected in series in the first phase of the first and second phases of the two phases of the fourth full-bridge circuit 13b. For example, the midpoint R3 is the connection point between the source of the element portion 31a (b3H) of the high-side arm and the drain of the element portion 31b (b3L) of the low-side arm.

[0030] The second switch 32 is, for example, a bidirectional switch formed by two switching elements. Each switching element is a transistor such as a MOSFET or an IGBT, for example, an N-channel MOSFET. The second switch 32 includes, for example, two transistors connected in anti-series. The two transistors are connected in series in opposite directions, for example, by connecting their sources to each other. The second switch 32 switches between conducting and blocking the current between the midpoints R2 and R3 by turning on (conducting) and off (blocking) the two transistors. Each transistor may include a rectifying element such as a free wheel diode connected in parallel in the forward direction from the emitter to the collector between the collector and the emitter.

[0031] The second power conversion unit 13 is connected to a β-phase first coil 33 (β1) and a β-phase second coil 34 (β2) of a rotating electric machine 16 (described later). The β-phase first coil 33 is connected between midpoints R1 and R2 of a third full-bridge circuit 13a. The β-phase second coil 34 (β2) is connected between midpoints R3 and R4 of a fourth full-bridge circuit 13b. The midpoint R1 of the third full-bridge circuit 13a is, for example, a connection point between a high-side arm element unit 31a (b1H) and a low-side arm element unit 31b (b1L) that are connected in series in the first phase of the third full-bridge circuit 13a. For example, the midpoint R1 is a connection point between the source of the high-side arm element unit 31a (b1H) and the drain of the low-side arm element unit 31b (b1L). The midpoint R4 of the fourth full-bridge circuit 13b is, for example, a connection point between the high-side arm element unit 31a (b4H) and the low-side arm element unit 31b (b4L), which are connected in series in the second phase of the fourth full-bridge circuit 13b. For example, the midpoint R4 is a connection point between the source of the high-side arm element unit 31a (b4H) and the drain of the low-side arm element unit 31b (b4L).

[0032] The second power conversion unit 13 includes a third circuit breaker 35 connected between one end of the β-phase first coil 33 (β1) and the third full-bridge circuit 13a, and a fourth circuit breaker 36 connected between one end of the β-phase second coil 34 (β2) and the fourth full-bridge circuit 13b. Each of the third and fourth switchgears 35 and 36 is, for example, a contactor. The third switchgear 35 is connected, for example, between one end of the β-phase first coil 33 (β1) and a midpoint R1 of the first phase of the third full-bridge circuit 13a, and switches the connection between the β-phase first coil 33 (β1) and the midpoint R1 on (conduction) and off (disconnection). The fourth switchgear 36 is connected, for example, between one end of the β-phase second coil 34 (β2) and a midpoint R4 of the fourth phase of the fourth full-bridge circuit 13b, and switches the connection between the β-phase second coil 34 (β2) and the midpoint R4 on (conduction) and off (disconnection).

[0033] The second power conversion unit 13 includes, for example, a capacitor 37 connected between the positive and negative electrodes. The capacitor 37 smoothes voltage fluctuations that occur due to the switching operation of each switching element of the second power conversion unit 13 between on (conduction) and off (cutoff). The second power conversion unit 13 includes, for example, a fourth current sensor 38a arranged between the β-phase first coil 33 (β1) and the midpoint R2, and a fifth current sensor 38b arranged between the β-phase second coil 34 (β2) and the midpoint R4. For example, the fourth current sensor 38a detects the current flowing through the β-phase first coil 33 (β1), and the fifth current sensor 38b detects the current flowing through the β-phase second coil 34 (β2).

[0034] The DC power supply connection unit 14 and the AC power supply connection unit 15 include, for example, connectors for DC power and AC power of predetermined standards. The DC power supply connection unit 14 and the AC power supply connection unit 15 are connected to an external DC power supply (external DC power supply) and an AC power supply (external AC power supply) based on, for example, a commercial power supply connected to a power grid. The DC power supply connection unit 14 is connected, for example, to the negative electrode of the second power conversion unit 13 and to the midpoint of each of the first switch 22 and the second switch 32 (that is, between the two transistors connected in anti-series). The AC power supply connection unit 15 is connected, for example, to each of the first midpoint R1 and the fourth midpoint R4 of the second power conversion unit 13, and to each of the connection points between the β-phase first coil 33 (β1) and the third circuit breaker 35 and the connection point between the β-phase second coil 34 (β2) and the fourth circuit breaker 36.

[0035] The rotating electric machine 16 (M) is, for example, a two-phase AC brushless DC motor. The rotating electric machine 16 includes, for example, an α-phase first coil 23 (α1), an α-phase second coil 24 (α2), a β-phase first coil 33 (β1), a β-phase second coil 34 (β2), a rotor 41, and a stator core 42. The rotor 41 includes a permanent magnet for a field. The stator core 42 has coils α1, α2, β1, and β2 attached thereto, which generate a rotating magnetic field that rotates the rotor 41.

[0036] The α-phase first coil 23 (α1) and the α-phase second coil 24 (α2), and the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are so-called open-end coils, and the ends of each coil α1, α2, β1, β2 are not connected to each other (i.e., each coil α1, α2, β1, β2 is disconnected from each other) and are drawn out to the outside of the rotating electric machine 16.

[0037] The α-phase first coil 23 (α1) and the α-phase second coil 24 (α2), for example, have a mutual spatial phase difference of zero and are wound in the same direction around the teeth of the stator core 42 when viewed from the axial direction along the central axis O of the rotating electric machine 16 (M). The α-phase first coil 23 (α1) and the α-phase second coil 24 (α2) are arranged, for example, to share or each occupy a part of a slot 43 formed in the stator core 42, and are magnetically coupled to each other with the same polarity. The β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are, for example, arranged so that the spatial phase difference between them is zero, and are wound in the same direction around the teeth of the stator core 42 when viewed from the axial direction along the central axis O of the rotating electric machine 16 (M). The β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are, for example, arranged so as to share or each occupy a part of a slot 43 formed in the stator core 42, and are magnetically coupled to each other with the same polarity.

[0038] The α-phase first coil 23 (α1) and α-phase second coil 24 (α2) and the β-phase first coil 33 (β1) and β-phase second coil 34 (β2) are arranged so as not to magnetically interfere with each other by making the spatial phase difference between them 90°. For example, the coils α1, α2, β1, and β2 are attached to the stator core 42 by concentrated winding or distributed winding.

[0039] Of the α-phase coils α1, α2 and the β-phase coils β1, β2, at least the β-phase coils β1, β2 are arranged so that the combinations of the number of turns differ between the first and second poles that form a pole pair (north and south poles) in the stator core 42. The combinations of the number of turns include, for example, a case where the first and second poles each have a β-phase first coil 33 (β1) and a β-phase second coil 34 (β2), and a case where the number of turns of the β-phase first coil 33 (β1) or the β-phase second coil 34 (β2) is zero for each of the first and second poles. When the first and second poles each have coils β1, β2, the ratio of the number of turns (i.e., the relative ratio) of the coils β1, β2 is defined as a value other than 1. The number of turns can be zero, for example, when only a β-phase first coil 33 (β1) is provided at the first pole and only a β-phase second coil 34 (β2) is provided at the second pole, or when only a β-phase second coil 34 (β2) is provided at the first pole and only a β-phase first coil 33 (β1) is provided at the second pole.

[0040] The correspondence relationship between the combination of the number of turns of each coil β1, β2 in the first pole and the combination of the number of turns of each coil β1, β2 in the second pole is a mutually inverted correspondence relationship, such as an inverse ratio of the number of turns. The correspondence relationship between the first pole and the second pole regarding the combination of the number of turns of each coil β1, β2 is, for example, two mutually inverted correspondence relationships between first pole pairs and second pole pairs that are set alternately with each other in the circumferential direction of the stator core 42 and have the same number of turns. The combination of the number of turns of each coil β1, β2 is the same for the first pole and the second pole of all pole pairs of the stator core 42. For each of the first pole and the second pole of the entire stator core 42, the number of turns of the β-phase first coil 33 (β1) and the number of turns of the β-phase second coil 34 (β2) are the same.

[0041] Table 1 below shows an example of the number of turns of each of the coils α1, α2, β1, and β2 corresponding to the north and south poles in each of the first and second pole pairs in the rotating electric machine 16(M) of the embodiment shown in Fig. 2. As shown in Table 1 below, in each of the first and second pole pairs, the correspondence between the combination of the number of turns of each of the coils β1 and β2 at the north pole and the combination of the number of turns of each of the coils β1 and β2 at the south pole is mutually inverted. With regard to the combination of the number of turns of each of the coils β1 and β2, the correspondence between the north pole and the south pole in the first pole pair is mutually inverted. As shown in Table 1 below, in the rotating electric machine 16(M) of the embodiment shown in Figure 2, the coils α1, α2 of the α phase are arranged, similar to the coils β1, β2 of the β phase, so that the combinations of the number of windings at the first and second poles that form a pole pair (N pole and S pole) in the stator core 42 are different.

[0042] [Table 1]

[0043] 2, for example, the β-phase first coil 33 (β1) is arranged in the first slot SL1 and the second slot SL2, and the β-phase second coil 34 (β2) is arranged in the third slot SL3 and the fourth slot SL4, with respect to the slots 43 (first slot SL1 and second slot SL2 facing the third slot SL3 and the fourth slot SL4) that face each other across the central axis O in the stator core 42. Also, in the α-phase, similarly to the β-phase, the α-phase first coil 23 (α1) is arranged in the second slot SL2 and the third slot SL3, and the α-phase second coil 24 (α2) is arranged in the first slot SL1 and the fourth slot SL4, with respect to the slots 43 (second slot SL2 and third slot SL3 facing the first slot SL1 and the fourth slot SL4) that face each other across the central axis O in the stator core 42.

[0044] The rotating electric machine 16(M) generates rotational power by performing power running operation using electric power supplied from the first electric power conversion unit 12 and the second electric power conversion unit 13. When the rotating electric machine 16(M) is connected to the wheels of a vehicle, for example, it generates driving force for traveling using electric power supplied from the first electric power conversion unit 12 and the second electric power conversion unit 13. The rotating electric machine 16(M) may generate power by performing regenerative operation using rotational power input from the wheels of the vehicle. When the rotating electric machine 16(M) is connected to the internal combustion engine of the vehicle, for example, it may generate power using the power of the internal combustion engine.

[0045] The gate drive unit 17 switches on (conducting) and off (disconnecting) each of the switching elements of the first power conversion unit 12 and the second power conversion unit 13 and each of the disconnectors 25, 26, 35, and 36 based on a control signal received from the electronic control unit 18. For example, the gate drive unit 17 switches on (conducting) and off (disconnecting) each of the switching elements of the full bridge circuits 12a, 12b, 13a, and 13b by outputting a gate signal generated by amplifying and level-shifting a control signal.

[0046] The electronic control unit 18 comprehensively controls the operations of the power control unit 10a and the rotating electric machine 16(M). For example, the electronic control unit 18 is a software function unit that functions when a processor such as a CPU (Central Processing Unit) executes a predetermined program. The software function unit is an ECU (Electronic Control Unit) that includes a processor such as a CPU, a ROM (Read Only Memory) that stores programs, a RAM (Random Access Memory) that temporarily stores data, and electronic circuits such as a timer. At least a part of the electronic control unit 18 may be an integrated circuit such as an LSI (Large Scale Integration).

[0047] The electronic control unit 18 generates control signals that indicate the timing to turn on (conduct) and off (disconnect) each of the switching elements of the first power conversion unit 12 and the second power conversion unit 13 and each of the disconnectors 25, 26, 35, 36. The electronic control unit 18 inputs the generated control signals to the gate drive unit 17.

[0048] (Control operation of electrical equipment) When the rotating electric machine 16 (M) is in power running or regenerative operation, the electronic control unit 18 sets the first circuit breaker 25 and the second circuit breaker 26 to an on (conducting) state. By switching the first switch 22 and the second switch 32 between on (conducting) and off (disconnecting), the electronic control unit 18 switches between a series connection of the α-phase coils α1, α2 and a series connection of the β-phase coils β1, β2, and a parallel connection of the α-phase coils α1, α2 and a parallel connection of the β-phase coils β1, β2. The electronic control unit 18 performs, for example, current feedback control using a current detection value of the rotating electric machine 16(M) and a current target value corresponding to a torque command value of the rotating electric machine 16(M), and generates a control signal that instructs the driving of each switching element of the first power conversion unit 12 and the second power conversion unit 13.

[0049] When the rotating electric machine 16(M) is in power running or regenerative operation, currents flow in the same direction (in phase) through the coils α1, α2, β1, and β2. The back electromotive waveforms of the coils α1, α2, β1, and β2 are the same as when, for example, the number of turns of the coils α1, α2, β1, and β2 are the same at the first and second poles. Even when the combination of the number of turns of the coils α1 and α2 and the combination of the number of turns of the coils β1 and β2 at the first and second poles of the stator core 42 are different, as in the rotating electric machine 16(M) of the embodiment, the power running and regenerative performance is equivalent to when the number of turns is the same.

[0050] During DC charging, that is, when the power storage device 11 is charged by an external DC power supply connected to the DC power supply connection unit 14, the electronic control unit 18 sets the first circuit breaker 25 and the second circuit breaker 26 to an on (conductive) state. For example, with respect to an external DC power supply having a lower voltage than the power storage device 11, the electronic control unit 18 causes each of the combination of the α-phase coils α1, α2 and the first power conversion unit 12 and the combination of the β-phase coils β1, β2 and the second power conversion unit 13 to function as a non-insulated DC-DC converter that performs a boost operation using so-called chopper control.

[0051] During AC charging, i.e., when charging the power storage device 11 using an external AC power source connected to the AC power source connection portion 15, the electronic control unit 18 sets the first circuit breaker 25 and the second circuit breaker 26 to an off (disconnected) state for insulation. The electronic control unit 18, for example, sets the α-phase first coil 23 (α1) and the α-phase second coil 24 (α2), which are magnetically coupled to each other with the same polarity, as a coil of a DC conversion phase (α-phase) used for conversion between DC powers. The electronic control unit 18, for example, causes the combination of the α-phase coils α1, α2 and the first power conversion unit 12 to function as a DAB (Dual Active Bridge) DC-DC converter, which is an insulated bidirectional (step-up and step-down) converter.

[0052] The electronic control unit 18, for example, configures the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2), which are magnetically coupled to each other with the same polarity, as the coils of the AC input phase (β-phase) connected to the external AC power supply. The electronic control unit 18, for example, causes the combination of the β-phase coils β1 and β2 and the second power conversion unit 13 to function as a so-called full-bridgeless (or bridgeless and totem-pole) power factor correction (PFC) circuit that converts AC power to DC power. The so-called bridgeless PFC is a PFC that does not include a bridge rectifier made up of multiple bridge-connected diodes, while the so-called totem-pole PFC is a PFC that includes a pair of switching elements of the same conductivity type connected in series in the same direction (totem-pole connection). The electronic control unit 18, for example, controls the switching of each switching element in each full bridge circuit 13a, 13b of the second power conversion unit 13, thereby rectifying and boosting the AC power received from the external AC power source to DC power and improving the power factor of the input voltage Vac and the input current Iac.

[0053] FIG. 3 is a block diagram showing the functional configuration of the electronic control unit 18 when the electric device 10 of the embodiment is being charged by AC. As shown in FIG. 3, the second power conversion unit 13 includes, for example, an input voltage sensor 51 that detects an input voltage Vac of the external AC power supply, and an input current sensor 52 that detects an input current Iac of the external AC power supply. The electronic control unit 18 includes, for example, a power supply voltage acquisition unit 61, a power supply current acquisition unit 62, a phase calculation unit 63, a target current calculation unit 64, a current control unit 65, a power calculation unit 66, and a PWM control unit 67.

[0054] The power supply voltage acquisition unit 61 outputs the input voltage Vac acquired from the input voltage sensor 51, for example. The power supply current acquisition unit 62 outputs the input current Iac acquired from the input current sensor 53, for example. The phase calculation unit 63 calculates, for example, the phase of the input voltage Vac output from the power supply voltage acquisition unit 61. The target current calculation unit 64 calculates a target current synchronized with the input voltage Vac based on, for example, the target current amplitude for the input current Iac and the phase of the input voltage Vac output from the phase calculation unit 63.

[0055] The current control unit 65 outputs the duty ratio of the voltage command by, for example, PI (proportional-integral) control or the like based on the current deviation obtained by subtracting the target current output from the target current calculation unit 64 from the input current Iac output from the power supply current acquisition unit 62. The duty ratio of the voltage command defines the ratio of the on time to the switching period of the paired switching elements (i.e., the switching elements of the high-side arm and low-side arm of each phase) in each of the full bridge circuits 13a, 13b of the second power conversion unit 13. The power calculation unit 66 outputs the power supply power obtained by multiplying the input voltage Vac output from the power supply voltage acquisition unit 61 by the input current Iac output from the power supply current acquisition unit 62, for example.

[0056] The PWM control unit 67 generates control signals indicating the timing to turn on (conduct) and off (cut) each switching element of each full bridge circuit 13a, 13b of the second power conversion unit 13, for example, by pulse width modulation operation based on the duty ratio of the voltage command output from the current control unit 65. The PWM control unit 67 sets switching patterns according to, for example, the power supply power output from the power calculation unit 66. For example, Table 2 below shows switching patterns for the parallel mode. The parallel mode is a mode in which the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are connected in parallel.

[0057] [Table 2]

[0058] In the switching patterns shown in Table 2 above, the first and fourth modes are modes for charging the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2), and the second and third modes are modes for discharging from each β-phase coil 33 (β1), 34 (β2). In Table 2 above, for example, as the duty (on ratio) of the element units b2H, b3H of the high-side arms of the second and third legs in the second power conversion unit 13 decreases toward 0.5, the first and fourth modes in which the β-phase coils 33 (β1), 34 (β2) are charged increase, while the second mode in which the β-phase coils 33 (β1), 34 (β2) are discharged decreases. For example, when the duty (on ratio) of the element units b2H, b3H of the high-side arms of the second and third legs is 0.5, only the first and fourth modes in which the β-phase coils 33 (β1), 34 (β2) are charged occur. For example, as the duty (on ratio) of the element parts b2H, b3H of the high side arms of the second leg and the third leg decreases from 0.5, the first mode and the fourth mode that charge each β-phase coil 33 (β1), 34 (β2) decrease, and the third mode that discharges each β-phase coil 33 (β1), 34 (β2) increases.

[0059] 4 is a circuit diagram showing an example of a current flow in the parallel mode during AC charging in the electric device 10 of the embodiment. The example shown in FIG. 4 corresponds to the third mode in Table 2 above. As shown in FIG. 4, in the parallel mode during AC charging, the electronic control unit 18 sets the third and fourth circuit breakers 35 and 36 to the off (disconnected) state. In the parallel mode, currents flow from the AC power supply connection unit 15 to the coils β1 and β2 in opposite directions (opposite phases). The currents flowing through the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are opposite-phase currents that weaken each other's magnetic flux. The degree to which the magnetic flux is weakened varies depending on the combination of the number of turns of the β-phase coils 33 (β1) and 34 (β2) at the first and second poles that form a pole pair (north and south poles) in the stator core 42 of the rotating electrical machine 16 (M). For example, as the difference between the combination of the number of turns of the first and second poles increases, the degree to which the magnetic flux is weakened decreases. As the degree of weakening of the magnetic flux between the β-phase coils 33 (β1) and 34 (β2) decreases, the inductance of each β-phase coil 33 (β1) and 34 (β2) increases compared to the leakage inductance due to leakage flux when the magnetic fluxes cancel each other out. For example, in the model of the rotating electric machine 16 (M) shown in Figure 2, the magnetic flux waveform becomes four-pole as indicated by magnetic flux line F.

[0060] As the combination of the number of turns of each coil β1, β2 at the first pole and the second pole of the stator core 42 is reversed, for example, the magnetic flux waveforms of each coil β1, β2 become inverted and cancel each other out, so that the torque generated in the rotating electric machine 16(M) during AC charging is zero. For example, if the rotor 41 and stator core 42 of the rotating electric machine 16(M) have eight poles, when current is passed in reverse phase to the winding pattern shown in Table 1 above, the magnetic flux waveform of the stator core 42 will have 16 poles. The ratio of the number of magnetic poles between the rotor 41 and the stator core 42 is 1:2, resulting in a magnetic circuit that generates magnetic flux but does not generate torque.

[0061] As described above, in the electric device 10 of the embodiment, the combination of the number of turns of each coil β1, β2 is different between the first pole and the second pole of the stator core 42, thereby preventing the magnetic fluxes from canceling each other out even when current is passed in reverse phase during parallel connection. This makes it possible to generate an inductance greater than the leakage inductance, thereby suppressing current ripple and distortion, and thereby improving charging efficiency. By having an inverted correspondence relationship between the number of turns of each coil β1 and β2 at the first pole and the second pole, the number of turns of each coil β1 and β2 can be made the same as each other throughout the stator core 42. This makes it possible to suppress torque generation in the rotating electric machine 16 during AC charging and to suppress the generation of impact noises such as gear rattles caused by torque pulsation. The back electromotive force waveforms of each coil β1 and β2 during power running and regeneration of the rotating electric machine 16 can be made the same as when the number of turns of each coil β1 and β2 at the first pole and the second pole are the same, making it possible to achieve equivalent power running and regeneration performance.

[0062] The coils β1 and β2 are arranged in opposing slots 43 of the stator core 42 across the central axis O, so that even when current is supplied in reverse phase during parallel connection, a magnetic flux distribution that cancels out the torque on the rotor 41 can be generated. By suppressing the torque generation of the rotating electric machine 16 during AC charging, it is possible to suppress the generation of impact noises such as gear rattles caused by torque pulsation.

[0063] By arranging the β-phase first coil 33 (β1) in the first slot SL1 and the second slot SL2, and the β-phase second coil 34 (β2) in the third slot SL3 and the fourth slot SL4, the inductance can be increased, and current ripple and distortion can be further suppressed.

[0064] When the rotating electric machine 16(M) is driven by the power storage device 11, the power control unit 10a can function as an inverter of a quadruple full-bridge circuit. When the power storage device 11 is being charged with DC from an external power source, the combination of each coil of the rotating electric machine 16(M) and each full-bridge circuit can function as a non-insulated DC-DC converter. When the power storage device 11 is being charged with AC from an external power source, the combination of each α-phase coil 23(α1), 24(α2) of the rotating electric machine 16(M) with the first full-bridge circuit 12a and the second full-bridge circuit 12b can function as an insulated bidirectional DC-DC converter. The combination of each β-phase coil 33(β1), 34(β2) with the third and fourth full-bridge circuits 13a, 13b can function as a rectifier circuit. For example, in the case of a voltage boost operation during AC charging, rapid charging can be performed for the voltage of the power storage device 11 that is higher than the charging voltage from the external power source.

[0065] (Variation) Modifications of the embodiment will be described below. Note that the same parts as those in the above-described embodiment will be denoted by the same reference numerals, and descriptions thereof will be omitted or simplified. In the above-described embodiment, the α-phase coils α1, α2 are arranged, like the β-phase coils β1, β2, so that the combinations of the number of turns are different between the first pole and the second pole that form a pole pair (N pole and S pole) in the stator core 42. However, this is not limiting. For example, the number of turns of the coils α1, α2 may be the same for the first pole and the second pole. FIG. 5 is a modeled configuration diagram of a rotating electrical machine 16A according to a first modified example of the embodiment. Table 3 below shows an example of the number of turns of each of the coils α1, α2, β1, β2 corresponding to the north and south poles in each of the first and second pole pairs in the rotating electric machine 16A of the first modified example shown in FIG.

[0066] [Table 3]

[0067] As shown in Figure 5 and Table 3 above, in the rotating electric machine 16A of the first modified example, the combinations of the number of turns of each of the coils β1 and β2 at the first and second poles that form a pole pair (N pole and S pole) in the stator core 42 are different, and the number of turns of each of the coils α1 and α2 are the same.

[0068] In the above-described embodiment, the number of turns of the β-phase first coil 33 (β1) or the β-phase second coil 34 (β2) is zero for each of the first and second poles that form a pole pair (N pole and S pole) in the stator core 42. However, this is not limited to this. For example, the first and second poles may each have a β-phase first coil 33 (β1) and a β-phase second coil 34 (β2). Fig. 6 is a modeled configuration diagram of a rotary electric machine 16B according to a second modified example of the embodiment. Note that the number of turns of each of the coils α1, α2, β1, and β2 shown in Fig. 6 is a schematic example. As shown in FIG. 6, a rotary electric machine 16B of the second modification includes coils α1 and α2 with different numbers of turns and coils β1 and β2 with different numbers of turns on each of the first and second poles. Table 4 below shows an example of the number of turns of each of the coils α1, α2, β1, β2 corresponding to the north and south poles in each of the first and second pole pairs in the rotating electric machine 16B of the second modified example shown in FIG.

[0069] [Table 4]

[0070] As shown in Table 4 above, in the rotating electric machine 16B of the second modified example, the ratio of the number of turns of the coils β1, β2 provided on each of the first and second poles is β1:β2 = 1:3 or β1:β2 = 3:1. In the rotating electric machine 16B of the second modified example, the coils α1, α2 of the α phase are similar to the coils β1, β2 of the β phase, and the ratio of the number of turns of the coils α1, α2 provided on each of the first and second poles is α1:α2 = 1:3 or α1:α2 = 3:1.

[0071] In the second modified example described above, for example, the number of turns of each of the coils α1 and α2 in the first pole and the second pole may be the same. Fig. 7 is a modeled configuration diagram of a rotary electric machine 16C according to a third modified example of the embodiment. Note that the number of turns of each of the coils α1, α2, β1, and β2 shown in Fig. 7 is a schematic example. As shown in FIG. 7, a rotating electric machine 16C of the third modification includes coils α1 and α2 with the same number of turns and coils β1 and β2 with different numbers of turns on each of the first and second poles. Table 5 below shows an example of the number of turns of each of the coils α1, α2, β1, β2 corresponding to the north and south poles in each of the first and second pole pairs in the rotating electric machine 16C of the third modified example shown in FIG. FIG. 8 is a configuration diagram showing an example of distributed winding of a rotating electrical machine 16C in a third modified example of the embodiment, corresponding to Table 5 below.

[0072] [Table 5]

[0073] As shown in FIG. 8 and Table 5, in the rotating electric machine 16C of the third modified example, the ratio of the number of turns of the coils β1 and β2 provided in each of the first and second poles is β1:β2=1:3 or β1:β2=3:1. The number of turns of the coils α1 and α2 in the first and second poles is the same. For example, if the rotor 41 and stator core 42 of the rotating electric machine 16C of the third modified example have eight poles, when current is passed in reverse phase with respect to the winding pattern shown in Table 5, the magnetic flux waveform of the stator core 42 will be four poles. The ratio of the number of magnetic poles of the rotor 41 and the stator core 42 is 2:1, resulting in a magnetic circuit in which magnetic flux is generated but torque is not generated.

[0074] In the above-described embodiment, the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) are magnetically coupled to each other with the same polarity. However, this is not limiting. The β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) may be magnetically coupled to each other with opposite polarities. In this case, for example, a disconnector may be connected between one end of the β-phase first coil 33 (β1) and a midpoint R2 of the second phase of the third full-bridge circuit 13a, or a disconnector may be connected between one end of the β-phase second coil 34 (β2) and a midpoint R3 of the third phase of the fourth full-bridge circuit 13b. In short, in the parallel mode during AC charging, it is sufficient that current flows in a direction that weakens the magnetic fluxes of the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2), depending on the polarity of the magnetic coupling between them.

[0075] In the above-described embodiment, current flows from the external AC power supply to the β-phase first coil 33 (β1) and the β-phase second coil 34 (β2) during AC charging, but this is not limited to this. For example, at least one of a circuit breaker that switches on (conduction) and off (disconnection) of the connection between the AC power supply connection unit 15 and the β-phase first coil 33 (β1) and a circuit breaker that switches on (conduction) and off (disconnection) of the connection between the AC power supply connection unit 15 and the β-phase second coil 34 (β2) may be provided. In this case, the current may be set to flow only through the β-phase first coil 33 (β1) or the β-phase second coil 34 (β2).

[0076] In the above-described embodiment, the DC power supply connection unit 14 is connected in a parallel pattern to the negative electrode of the second power conversion unit 13 and the midpoint of each of the first switch 22 and the second switch 32 (i.e., between the two transistors connected in anti-series), but this is not limiting. For example, the DC power supply connection unit 14 may be connected in a series pattern to the negative electrode of the second power conversion unit 13 and the midpoint Q4 of the first power conversion unit 12 and the midpoint R4 of the second power conversion unit 13. For example, the DC power supply connection unit 14 may be connected in another parallel pattern to the negative electrode of the second power conversion unit 13 and the midpoints Q2 and Q4 of the first power conversion unit 12 and the midpoints R2 and R4 of the second power conversion unit 13.

[0077] In the above-described embodiment, the functional configuration of the electronic control unit 18 during AC charging of the electric device 10 shown in Fig. 3 may not require acquisition of the phase of the input voltage Vac of the external AC power supply. For example, an output voltage sensor may be provided that detects the output voltage Vo across both ends (between the positive and negative poles) of the capacitor 37, and a voltage control unit may be provided that outputs a current amplitude target value of the input current Iac of the external AC power supply by PI (proportional-integral) control or the like based on the output voltage Vo acquired from the output voltage sensor and a target voltage.

[0078] The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0079] 10...electrical equipment, 10a...power control unit, 11...power storage device, 12...first power conversion section, 12a...first full bridge circuit (third full bridge circuit), 12b...second full bridge circuit (fourth full bridge circuit), 13...second power conversion section, 13a...third full bridge circuit (first full bridge circuit), 13b...fourth full bridge circuit (second full bridge circuit), 14...DC power supply connection section, 15...AC power supply connection section (AC power supply connection member), 16, 16A, 16B, 16C...rotating electric machine, 17...gate drive unit, 18...electronic control unit, 22 ...first switch, 23...α phase first coil (α1) (coil, third coil), 24...α phase second coil (α2) (coil, fourth coil), 25...first circuit breaker, 26...second circuit breaker, 32...second switch, 33...β phase first coil (β1) (coil, first coil), 34...β phase second coil (β2) (coil, second coil), 35...third circuit breaker (first circuit breaker), 36...fourth circuit breaker (second circuit breaker), 41...rotor, 42...stator core, 43...slot, SL1...first slot, SL2...second slot, SL3...third slot, SL4...fourth slot.

Claims

1. a power storage device; a rotating electric machine having a rotor and a plurality of coils; a power control unit connected to the rotating electric machine and the power storage device, the power control unit controlling power exchange between the power storage device and the rotating electric machine; an AC power supply connection member that connects the rotating electric machine to an external AC power supply; Equipped with the power control unit includes a first full bridge circuit connected to both ends of a first coil and a second coil that form a predetermined phase connected to the AC power supply connection member among the plurality of coils, and a second full bridge circuit connected to both ends of the second coil; The rotating electric machine includes a stator core having slots in which the first coil and the second coil are arranged, the first pole and the second pole forming a pole pair having different combinations of winding numbers. Electrical equipment.

2. The first coil and the second coil are arranged in the slots that face each other across the central axis of the stator core. The electrical device according to claim 1 .

3. The first coil is disposed in a first slot and the second coil is disposed in a second slot, the first slot and the second slot being the slots facing each other across the central axis of the stator core. The electrical device according to claim 2.

4. The combination of the number of turns of the first coil and the second coil at the first pole and the second pole of all pole pairs of the stator core is the same. The electrical device according to any one of claims 1 to 3.

5. The predetermined phase is an AC input phase that converts AC power input into DC power output.

5. The electrical device according to claim 4.

6. The power control unit a first breaker connected between one end of the first coil and the first full bridge circuit; a second circuit breaker connected between one end of the second coil and the second full bridge circuit; a third full bridge circuit connected to both ends of a third coil and a fourth full bridge circuit connected to both ends of the fourth coil, the third coil and the fourth coil forming a DC conversion phase for converting DC power among the plurality of coils; a third breaker connected between the positive electrodes of the third full bridge circuit and the fourth full bridge circuit; a fourth breaker connected between the negative electrodes of the third full bridge circuit and the fourth full bridge circuit; Equipped with The electrical device according to claim 5.

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