WO2022249568A1 - Electric drive system - Google Patents

Electric drive system Download PDF

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Publication number
WO2022249568A1
WO2022249568A1 PCT/JP2022/004889 JP2022004889W WO2022249568A1 WO 2022249568 A1 WO2022249568 A1 WO 2022249568A1 JP 2022004889 W JP2022004889 W JP 2022004889W WO 2022249568 A1 WO2022249568 A1 WO 2022249568A1
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WO
WIPO (PCT)
Prior art keywords
winding
circuit
electric drive
drive system
coil
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Application number
PCT/JP2022/004889
Other languages
French (fr)
Japanese (ja)
Inventor
雅寛 堀
健 徳山
公則 澤畠
英明 後藤
Original Assignee
日立Astemo株式会社
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Publication of WO2022249568A1 publication Critical patent/WO2022249568A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/22—Multiple windings; Windings for more than three phases

Definitions

  • the present invention relates to an electric drive system.
  • Patent Literature 1 discloses a stator coil for a three-phase rotating electrical machine in which a plurality of helically wound sheet-like coils are laminated in the sheet thickness direction and electrically connected. The helically-wound sheet-like coil is wound around the stator core so that the coil conductor is helically connected to form a wave-wound structure.
  • the plurality of helical-wound sheet-like coils includes a series connection portion in which in-phase phase coils are connected in series between the helical-wound sheet-like coils, and a parallel connection portion in which in-phase phase coils are connected in parallel between the helical-wound sheet-like coils.
  • a connector In the rotating electrical machine described in Patent Document 1, in order to improve the efficiency of the rotating electrical machine by reducing the AC copper loss generated in the coil conductor near the rotor, the conductor of the coil conductor in the parallel connection portion close to the rotor is reduced.
  • the cross-sectional area is set to 1/the parallel number of the conductor cross-sectional area of the coil conductor of the series connection portion.
  • An object of the present invention is to provide a highly efficient electric drive system by reducing AC copper loss and preventing the generation of circulating current.
  • An electric drive system includes a rotating electric machine having a stator and a rotor rotatably arranged on the inner peripheral side of the stator, and a driving device that supplies electric power to the rotating electric machine.
  • the stator has a stator coil made of a rectangular wire and a stator core having a plurality of slots in which the stator coil is arranged.
  • the stator coil has a plurality of system windings that are wave-wound on the stator core.
  • the plurality of system windings include a first system winding mounted on the stator core with a spatial phase difference of 0° from a reference phase, and a first system winding mounted on the stator core with a spatial phase difference of n° from the reference phase.
  • the first winding system and the second winding system are respectively a first circuit formed by a coil conductor on the outer diameter side of the stator core and a parallel circuit formed by a coil conductor on the inner diameter side of the stator core. A certain second circuit is connected in series. The coil conductor on the inner diameter side is thinner than the coil conductor on the outer diameter side.
  • the drive device has a first inverter connected to the first winding system and a second inverter connected to the second winding system. The drive device applies voltages to the first winding system and the second winding system with the n° phase difference in terms of time.
  • a highly efficient electric drive system can be provided by reducing AC copper loss and preventing the generation of circulating current.
  • FIG. 1 is a diagram showing the configuration of an electric drive system.
  • FIG. 2 is a schematic side cross-sectional view of the electric drive system.
  • FIG. 3 is a schematic cross-sectional plan view showing a part of the rotary electric machine.
  • FIG. 4 is a perspective view of the stator, showing one end side of the stator.
  • FIG. 5 is a connection diagram of the stator coil.
  • FIG. 6 is a schematic diagram for explaining the positions of the phase windings arranged in the slots of the stator core.
  • FIG. 7 is a diagram for explaining the connection structure between the first circuit and the second circuit.
  • FIG. 8 is a diagram for explaining the induced voltages generated in the U1-phase winding and the U2-phase winding.
  • FIG. 9 is a diagram for explaining differences in configuration and effect between a circuit having in-slot conductors of the same thickness and a circuit having in-slot conductors of different thicknesses.
  • FIG. 10 is a diagram illustrating a parallel circuit Cp3 in which a circulating current is generated and a parallel circuit Cp4 in which the generation of circulating current is prevented.
  • FIG. 11 shows a circuit in which a circulating current is generated between the first system winding and the second system winding, and a circuit in which the generation of circulating current is prevented between the first system winding and the second system winding. It is a figure explaining a circuit.
  • FIG. 12 is a diagram showing an arrangement configuration of stator coils according to modification 1-1 of the present embodiment.
  • FIG. 12 is a diagram showing an arrangement configuration of stator coils according to modification 1-1 of the present embodiment.
  • FIG. 13 is a diagram showing the arrangement configuration of stator coils according to modification 1-2 of the present embodiment.
  • FIG. 14 is a torque waveform diagram of the rotary electric machines according to Modifications 1-1 and 1-2 of the present embodiment.
  • FIG. 15 is a schematic side cross-sectional view of an electric drive system according to Modification 2 of the present embodiment.
  • the electric drive system according to the present embodiment is an electric drive system suitable for use as a drive source for running an automobile.
  • the electric drive system according to this embodiment can be applied to, for example, a hybrid electric vehicle driven by both an engine and a rotating electric machine, and a pure electric vehicle running only by a rotating electric machine.
  • FIG. 1 is a diagram showing the configuration of the electric drive system 10
  • FIG. 2 is a schematic side sectional view of the electric drive system 10.
  • the electric drive system 10 includes a rotating electrical machine 110 and a drive device 170 that supplies electric power to the rotating electrical machine 110 .
  • drive device 170 detects electric currents of power storage device 179 , first inverter 171 A, second inverter 171 B, control circuit board 175 , drive circuit boards 173 A and 173 B, and rotating electric machine 110 . and current sensors 172A and 172B.
  • the power storage device 179 is a power supply device that is composed of a capacitor or a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery, and outputs high-voltage DC power of 250 V to 600 V or more. Power storage device 179 supplies electric power to rotating electric machine 110 during power running, and receives electric power from rotating electric machine 110 during regenerative running. Electric power is exchanged between power storage device 179 and rotary electric machine 110 via first inverter 171A and second inverter 171B, which are power conversion devices.
  • the rotational torque generated by the rotating electric machine 110 is transmitted to the wheels via the transmission 180 (see FIG. 2) and the differential gear (not shown), and the electric vehicle (also referred to as vehicle) runs.
  • Drive device 170 controls rotating electric machine 110 based on a torque command from an integrated control device (not shown) so that torque output or power generation according to the command is generated.
  • the first inverter 171A and the second inverter 171B have a plurality of power semiconductor elements.
  • the driving device 170 controls the switching operation of the power semiconductor elements based on commands from an integrated control device (not shown).
  • the switching operation of the power semiconductor elements causes rotating electric machine 110 to operate as a motor or as a generator.
  • the first inverter 171A and the second inverter 171B generate a rectangular wave from the DC voltage by switching operation (ON/OFF) of the power semiconductor element, and generate a simulated AC voltage.
  • the driving device 170 controls the magnitude and frequency of the AC voltage by controlling the period and timing of the switching operation of the power semiconductor element.
  • the first inverter 171A and the second inverter 171B are connected to the same power storage device (power supply device) 179 . That is, the DC link voltage is shared between the first inverter 171A and the second inverter 171B. In this configuration, two voltages can be output from the DC link voltage of one power storage device 179 by two inverters 171A and 171B. Also, by sharing the DC link voltage, the cost of the electric drive system 10 can be reduced.
  • the DC power from the power storage device 179 is supplied to the DC terminals of the first inverter 171A and the second inverter 171B.
  • Drive device 170 controls the switching operation of the power semiconductor element, converts the supplied DC power into three-phase AC power, and supplies the three-phase AC power to rotary electric machine 110 .
  • the rotor of rotating electrical machine 110 is rotationally driven by a rotational torque applied from the outside, and three-phase AC power is generated in the stator coils.
  • the generated three-phase AC power is converted into DC power by drive device 170, and the DC power is supplied to power storage device 179, whereby power storage device 179 is charged.
  • the drive circuit board 173A is provided with a drive circuit 174A that controls the switching operation of the power semiconductor elements of the first inverter 171A.
  • the drive circuit board 173B is provided with a drive circuit 174B that controls the switching operation of the power semiconductor elements of the second inverter 171B.
  • the control circuit board 175 is provided with a control circuit 176 that outputs control signals to the drive circuits 174A and 174B.
  • Drive circuits 174A and 174B generate drive signals for driving the power semiconductor elements based on control signals output from control circuit 176 .
  • the control circuit 176 constitutes a control device that controls the inverters 171A and 171B.
  • the control circuit 176 is composed of a microcomputer that calculates control signals (control values) for operating (turning on/off) a plurality of power semiconductor devices.
  • the control circuit 176 receives a torque command signal (torque command value) from an integrated control device (not shown), sensor outputs of the current sensors 172A and 172B, and sensor outputs of a rotation sensor (not shown) mounted on the rotary electric machine 110. is entered.
  • the control circuit 176 calculates control values based on those input signals, and outputs control signals (instructions) for controlling switching operations of the power semiconductor elements to the drive circuits 174A and 174B.
  • control circuit 176 It is commonly used by the control circuit 176, the first inverter 171A and the second inverter 171B. That is, commands from the same control circuit (control device) 176 are input to the first inverter 171A and the second inverter 172 . By sharing the control circuit 176, the cost of the electric drive system 10 can be reduced.
  • the electric drive system 10 includes a rotating electrical machine 110, a drive device 170, a transmission 180, and a housing 190 that accommodates them.
  • the housing 190 has a motor housing 191 that houses the rotating electric machine 110 , an inverter housing 197 that houses the driving device 170 , and a gear housing 198 that houses the transmission 180 .
  • the motor housing 191 and the inverter housing 197 are integrated by being fastened by fastening members 17 such as bolts and nuts. Since the rotating electric machine 110 and the drive device 170 are packaged into one package, the mounting work to the vehicle can be improved compared to the case where the rotating electric machine 110 and the drive device 170 are individually mounted to the vehicle. In addition, cables can be omitted compared to the case where rotating electric machine 110 and drive device 170 are separately arranged. As a result, the weight of the electric drive system 10 can be reduced, and noise can be reduced.
  • the gear housing 198 is fastened to the motor housing 191 by fastening members (not shown).
  • the rotating electrical machine 110 is, for example, a permanent magnet embedded three-phase synchronous motor generator.
  • the rotating electric machine 110 has a cylindrical stator 130 fixed to a motor housing 191 and a cylindrical rotor 150 rotatably arranged on the inner peripheral side of the stator 130 with a gap therebetween.
  • axial direction is a direction along the rotation center axis Ca of the rotary electric machine 110 (rotor 150). Note that the rotation center axis Ca coincides with the center axis of the stator 130 .
  • the “circumferential direction” is a direction along the direction of rotation of rotating electric machine 110 (the direction of rotation of rotor 150), that is, a circumferential direction orthogonal to the axial direction and centered on rotation center axis Ca.
  • a “radial direction” is a direction orthogonal to the rotation center axis Ca of the rotating electric machine 110 and the circumferential direction, that is, the radial direction.
  • the “inner peripheral side” refers to the radially inner side (inner diameter side), and the “outer peripheral side” refers to the opposite direction, that is, the radial outer side (outer diameter side).
  • FIG. 3 is a schematic cross-sectional plan view showing a portion of rotating electric machine 110
  • FIG. 4 is a perspective view of stator 130 showing one end side of stator 130.
  • stator 130 has a cylindrical stator core 131 and stator coils 160 mounted on stator core 131 .
  • the stator core 131 is formed, for example, by laminating a plurality of annular magnetic steel sheets.
  • the stator core 131 is fitted and fixed inside the motor housing 191 (see FIG. 2).
  • a plurality of (48 slots in this embodiment) slots 133 are formed in the inner peripheral portion of the stator core 131 parallel to the central axis direction of the stator core 131 .
  • the slots 133 are semi-closed parallel slots having side surfaces parallel to each other along the radial direction of the stator core 131 . That is, the slot 133 has a constant circumferential width from the outer peripheral end to the flange of the tooth 134 .
  • a plurality of phase windings of U-phase, V-phase, and W-phase that constitute stator coil 160 are arranged in slots 133 .
  • a plurality of slots 133 are formed at regular intervals in the circumferential direction of stator core 131 .
  • Teeth 134 are formed between the slots 133 .
  • a plurality of teeth 134 are formed to protrude from an annular core back 135 toward the rotation center axis Ca.
  • the teeth 134 form radial magnetic paths, and the core backs 135 form circumferential magnetic paths.
  • the teeth 134 guide the rotating magnetic field generated by the stator coil 160 to the rotor 150 and cause the rotor 150 to generate rotating torque.
  • rotor 150 includes rotor core 151 , multiple permanent magnets 152 fixed to rotor core 151 , and shaft 159 fixed to a through hole of rotor core 151 .
  • the rotor 150 is rotatably held inside the stator core 131 by supporting the shaft 159 with a plurality of bearings provided in the housing 190 .
  • the rotor core 151 is formed, for example, by laminating a plurality of annular electromagnetic steel sheets.
  • Permanent magnets 152 form the field poles of rotor 150 .
  • a neodymium-based or samarium-based sintered magnet, a ferrite magnet, a neodymium-based bond magnet, or the like can be used.
  • rectangular parallelepiped magnet insertion holes 153 are formed in the vicinity of the outer peripheral portion at regular intervals in the circumferential direction. It is fixed with an agent.
  • the circumferential width of the magnet insertion hole 153 is larger than the circumferential width of the permanent magnet 152 .
  • a magnetic gap is formed between the circumferential ends of the permanent magnet 152 and the circumferential ends of the magnet insertion hole 153 .
  • An adhesive may be embedded in this magnetic gap, or it may be integrally fixed with the permanent magnet 152 with resin.
  • the magnetization direction of the permanent magnet 152 is radial, and the magnetization direction is reversed for each field pole.
  • the permanent magnet 152 that forms the next magnetic pole is magnetized on the side of the stator 130 . is magnetized to the S pole, and the surface on the shaft 159 side is magnetized to the N pole.
  • FIG. 4 a stator coil 160 is wound around the stator core 131 by distributed winding (wave winding).
  • Distributed winding is a winding method in which a phase winding is wound around the stator core 131 so that the phase winding is accommodated in two slots 133 that are spaced across a plurality of slots 133 .
  • the stator coil 160 is formed by connecting a plurality of U-shaped segment conductors 165 in a wave shape.
  • the central portion of the segment conductor 165 constitutes one coil end 162A of the stator 130 in the axial direction. Both ends of the segment conductor 165 are welded to constitute the other axial coil end 162B of the stator 130 .
  • the stator coil 160 includes coil conductors (hereinafter referred to as in-slot conductors) 161 arranged in the slots 133 of the stator core 131 and protruding outside the slots 133 from both ends of the stator core 131 . It has coil ends 162A and 162B which are arranged coil conductors.
  • the stator coil 160 has a rectangular cross section and is formed of, for example, a rectangular wire in which a conductor (conductor wire) mainly composed of copper is covered with an insulating film such as an enamel film.
  • the in-slot conductor 161 arranged in the slot 133 has a radial length (hereinafter also referred to as coil height) Hi and Ho compared to a circumferential length (hereinafter also referred to as coil width) B. small.
  • in-slot conductors 161 having a rectangular cross section are arranged in a row in the radial direction in one slot 133 . That is, in the slot 133, a plurality of in-slot conductors (coil conductors) 161 are arranged in layers in the radial direction.
  • the accommodating portions for the coil conductors in the slots 133 in which the in-slot conductors 161 are arranged are arranged in order from the inner peripheral side (slot opening side) of the slot 133 toward the outer peripheral side as the first layer L1, the second layer L2, They are called the third layer L3, the fourth layer L4, the fifth layer L5, and the sixth layer L6.
  • the coil conductors arranged on the first layer L1 and the second layer L2 of the slot 133 are referred to as a first inner diameter side coil 160ia, and the coil conductors arranged on the third layer L3 and the fourth layer L4 of the slot 133 are referred to as the second inner diameter coil 160ia.
  • the coil conductors arranged in the fifth layer L5 and the sixth layer L6 of the slot 133 are referred to as outer diameter side coils 160o. That is, the outer coil 160o is formed by a coil conductor arranged on the outer diameter side of the stator core 131, and the inner coils 160ia and 160ib are formed by coil conductors arranged on the inner diameter side of the stator core 131.
  • the coil height (thickness) Hi of the in-slot conductor 161 of the first inner diameter side coil 160ia and the second inner diameter side coil 160ib is smaller than the coil height (thickness) Ho of the in-slot conductor 161 of the outer diameter side coil 160o ( Hi ⁇ Ho).
  • An insulating material 169 is provided between the inner peripheral surface of the slot 133 and the in-slot conductor (coil conductor) 161 and between the plurality of in-slot conductors (coil conductors) 161 in the slot 133 .
  • the insulating material 169 is, for example, varnish, and is filled between the inner peripheral surface of the slot 133 and the coil conductors and between adjacent coil conductors. Note that the insulating material 169 is not limited to varnish as long as it is a non-conductive material.
  • insulating paper may be used as the insulating material 169 .
  • the slot 133 may be filled with insulating paper and then filled with varnish. Thereby, the insulation reliability of rotating electric machine 110 can be improved.
  • FIG. 5 is a connection diagram of the stator coil 160.
  • the stator coil 160 has a plurality of system windings mounted on the stator core 131 by wave winding.
  • the stator coil 160 has a first winding system 160A connected to the first inverter 171A and a second winding system 160B connected to the second inverter 171B.
  • the first system winding 160A is composed of U1, V1 and W1 phase windings
  • the second system winding 160B is composed of U2, V2 and W2 phase windings.
  • the phase windings (U1, U2, V1, V2, W1, W2 phase windings) are arranged with proper spacing from each other by the slots 133 .
  • the U1-phase winding, V1-phase winding, and W1-phase winding are connected by star connection (Y connection).
  • the U1-phase winding, the V1-phase winding, and the W1-phase winding are connected at one end to a neutral point, and connected at the other end to the first inverter 171A.
  • the U2-phase winding, the V2-phase winding, and the W2-phase winding are connected by a star connection (Y connection).
  • the U2-phase winding, the V2-phase winding, and the W2-phase winding are connected to a neutral point at one end and connected to the second inverter 171B at the other end.
  • the U1, V1, W1 phase windings and the U2, V2, W2 phase windings each consist of six winding windings.
  • the loop winding is a winding that mechanically makes one turn around stator core 131 by connecting a plurality of segment conductors 165 .
  • eight segment conductors 165 form one winding.
  • the U1-phase winding of the first winding system 160A has a plurality of winding windings u12A0, u12B0, u34A0, u34B0, u56A0, and u56B0
  • the U2-phase winding of the second winding system 160B has a winding u12A30.
  • u12B30, u34A30, u34B30, u56A30, u56B30 has a winding u12A30.
  • FIG. 6 is a schematic diagram for explaining the positions of the phase windings arranged in the slots 133 of the stator core 131.
  • 12 slots 133 are arranged at an electrical angle of 360 degrees.
  • slot number "1" to slot number "12" in FIG. 6 correspond to two poles (one magnetic pole pair).
  • the number of slots 133 for one period of electrical angle is obtained by dividing the total number of slots (48 slots) by the number of pole pairs (4 pole pairs).
  • the number of pole pairs is the number of pairs of N poles and S poles, and corresponds to the number of poles of rotating electric machine 110/2.
  • Six in-slot conductors 161 are inserted into each slot 133 .
  • a cross mark "x" indicates the direction from one side of the stator core 131 to the opposite side, and a black circle mark " ⁇ " indicates the opposite direction.
  • the circuit windings u12A0, u12B0, u34A0, u34B0, u56A0, and u56B0 that constitute the U1 phase winding and the circuit windings u12A30, u12B30, u34A30, u34B30, u56A30, and u56B30 that constitute the U2 phase winding are shown.
  • the positions of the coil conductors forming the V1-phase winding, the V2-phase winding, the W1-phase winding, and the W2-phase winding are indicated by symbols V and W representing phases.
  • the slot pitch which is the distance between adjacent slots 133, is 7.5 degrees in mechanical angle. This spatially corresponds to a phase difference of 30 electrical degrees.
  • the phase difference between adjacent slots 133 is obtained by dividing 360° by 12, which is the number of slots 133 for one electrical angle cycle.
  • the winding winding u12A0 and the winding winding u12A30 arranged in the first layer L1 and the second layer L2 have a spatial phase difference of 30 degrees in electrical angle
  • the winding winding u12B0 and the winding winding u12B30 are: It has a spatial phase difference of 30 degrees in electrical angle
  • the winding winding u34A0 and the winding winding u34A30 arranged in the third layer L3 and the fourth layer L4 have a spatial phase difference of 30 degrees in electrical angle
  • the winding winding u34B0 and the winding winding u34B30 are: It has a spatial phase difference of 30 degrees in electrical angle.
  • the winding winding u56A0 and the winding winding u56A30 arranged in the fifth layer L5 and the sixth layer L6 have a spatial phase difference of 30 degrees in electrical angle, and the winding winding u56B0 and the winding winding u56B30 are It has a spatial phase difference of 30 degrees in electrical angle.
  • the U1-phase winding and the U2-phase winding are arranged so as to have a spatial phase difference of 30 degrees in electrical angle.
  • the V1-phase winding and the V2-phase winding are arranged so as to have a spatial phase difference of 30° in electrical angle
  • the W1-phase winding and the W2-phase winding are arranged to have a spatial phase difference of 30° in electrical angle. are arranged to have
  • the first system winding 160A and the second system winding 160B are attached to the stator core 131 so as to have a spatial phase difference of 30 degrees in electrical angle.
  • the first winding system 160A is attached to the stator core 131 with a spatial phase difference of 0° from the reference phase
  • the second winding system 160B has a spatial phase difference of 30° from the reference phase. is attached to the stator core 131 at .
  • the reference phase refers to the phase of slot 133 in which first system winding 160A is mounted.
  • the spatial phase difference n° between the first system winding 160A and the second system winding 160B corresponds to 360°/(number of slots 133/number of pole pairs).
  • a first circuit C11 formed by the outer diameter side coil 160o and a second circuit C12 formed by the inner diameter side coils 160ia and 160ib. are connected in series.
  • the first circuit C11 is a series circuit in which the encircling winding u56A0 and the encircling winding u56B0 arranged in the fifth layer L5 and the sixth layer L6 of the slot 133 are connected in series.
  • the second circuit C12 is a parallel circuit in which the first series circuit Cs11 and the second series circuit Cs12 are connected in parallel.
  • the first series circuit Cs11 includes the circulating winding u12A0 arranged on the first layer L1 and the second layer L2 of the slot 133, and the circulating winding u34A0 arranged on the third layer L3 and the fourth layer L4 of the slot 133. is a series circuit in which and are connected in series.
  • the second series circuit Cs12 includes the circulating winding u12B0 arranged in the first layer L1 and the second layer L2 of the slot 133, and the circulating winding u34B0 arranged in the third layer L3 and the fourth layer L4 of the slot 133. is a series circuit in which and are connected in series.
  • the first circuit C21 formed by the outer coil 160o and the second circuit C22 formed by the inner coils 160ia and 160ib are connected in series.
  • the first circuit C21 is a series circuit in which the encircling winding u56A30 and the encircling winding u56B30 arranged in the fifth layer L5 and the sixth layer L6 of the slot 133 are connected in series.
  • the second circuit C22 is a parallel circuit in which the first series circuit Cs21 and the second series circuit Cs22 are connected in parallel.
  • the first series circuit Cs21 includes the circulating winding u12A30 arranged on the first layer L1 and the second layer L2 of the slot 133, and the circulating winding u34A30 arranged on the third layer L3 and the fourth layer L4 of the slot 133. is a series circuit in which and are connected in series.
  • the second series circuit Cs22 includes the circulating winding u12B30 arranged on the first layer L1 and the second layer L2 of the slot 133, and the circulating winding u34B30 arranged on the third layer L3 and the fourth layer L4 of the slot 133. is a series circuit in which and are connected in series.
  • the circuit configurations of the V-phase winding and the W-phase winding are the same as the circuit configuration of the U-phase winding, so description thereof will be omitted.
  • the number of winding windings arranged in the first layer L1 and the second layer L2 that constitute the first series circuit Cs11 of the U1-phase winding, and the first layer L1 and the second layer that constitute the second series circuit Cs12 The number of winding windings arranged in the eye L2 is the same. Also, the number of winding windings arranged in the third layer L3 and the fourth layer L4 that constitute the first series circuit Cs11 of the U1-phase winding, and the third layer L3 and L3 that constitute the second series circuit Cs12 The number of winding windings arranged in the fourth layer L4 is the same.
  • the number of circling windings arranged in the first layer L1 and the second layer L2 forming the first series circuit Cs21 of the U2-phase winding and the number of the first layer L1 forming the second series circuit Cs22 and the number of winding windings arranged in the second layer L2 are the same.
  • the number of winding windings arranged in the third layer L3 and the fourth layer L4 that constitute the first series circuit Cs21 of the U2-phase winding, the third layer L3 that constitutes the second series circuit Cs22 and The number of winding windings arranged in the fourth layer L4 is the same.
  • the second layer when the first layer, the second layer, .
  • the number of windings is the same.
  • the round winding that constitutes the U1-phase winding is formed by connecting four wavy coils that are formed by connecting two U-shaped segment conductors 165 .
  • the number of wavy coils arranged on the s, s+1-th layers constituting the first series circuit Cs11 and the number of wavy coils arranged on the s, s+1-th layers constituting the second series circuit Cs12 are can be said to match. Thereby, it is possible to prevent a circulating current from being generated in the second circuit C12, which is a parallel circuit.
  • the number of winding windings arranged in the s, s+1-th layer (s is an odd number from 1 to m) constituting the first series circuit Cs21, and the number of windings s, constituting the second series circuit Cs22
  • the number of winding windings arranged on the s+1-th layer is the same.
  • the round winding that constitutes the U2-phase winding is formed by connecting four wavy coils formed by connecting two U-shaped segment conductors 165 .
  • the number of wavy coils arranged on the s, s+1-th layers constituting the first series circuit Cs21 and the number of wavy coils arranged on the s, s+1-th layers constituting the second series circuit Cs22 are can be said to match.
  • a parallel circuit (second circuit) of the V1, V2, W1 and W2 phases which have the same circuit configuration as the U1 and U2 phases, the occurrence of circulating current can be prevented.
  • connection structure between the first circuits C11, C21 and the second circuits C12, C22 will be described with reference to FIG. Since the connection structure between the first circuit C11 and the second circuit C12 of the U1 phase winding and the connection structure of the first circuit C21 and the second circuit C22 of the U2 phase winding are the same, the first circuit of the U1 phase winding
  • the connection structure between C11 and the second circuit C12 will be described as a representative.
  • connection conductor 168 is formed of, for example, a rectangular copper plate, and is connected to the lead wire of the first circuit C11 and the lead wire of the second circuit C12 by welding or the like.
  • the thickness of the coil conductor of the first circuit C11 is different from the thickness of the coil conductor of the second circuit C12 (coil height Hi) (see FIG. 3). It is difficult to weld coil conductors of different thicknesses directly by butt welding.
  • connection conductor 168 is welded to each of the side surface of the lead wire of the first circuit C11 and the side surface of the lead wire of the second circuit C12. That is, the connection conductor 168 and the first circuit C11 are connected via the weld, and the connection conductor 168 and the second circuit C12 are connected via the weld.
  • the first circuit C11 and the second circuit C12 can be easily connected by connecting the first circuit C11 and the second circuit C12 through the connection conductor 168 instead of connecting them directly. Therefore, the manufacturing cost of rotating electric machine 110 can be reduced.
  • the connection conductor 168 is not limited to a copper plate, and may be a conductive member such as a lead wire.
  • the induced voltages generated in the U1-phase winding and the U2-phase winding will be described with reference to FIG.
  • the induced voltage is generated due to the magnetic flux interlinking the coil.
  • induced voltages Vu12 ⁇ 0° spatially in phase with the reference phase are generated in the loop windings u12A0 and u12B0, and in the loop windings u34A0 and u34B0, the reference phase
  • An induced voltage Vu34 ⁇ 0° whose phase matches the reference phase is generated in the winding windings u56A0 and u56B0.
  • An induced voltage Vu56 ⁇ 30° having a phase difference is generated.
  • a similar induced voltage is also generated in the winding windings that constitute the V1-phase winding, the V2-phase winding, the W1-phase winding, and the W2-phase winding.
  • the drive device 170 applies a voltage with a temporal phase difference of 0° to the first system winding 160A with a spatial phase difference of 0°, and applies a voltage with a temporal phase difference of 0° to the second system winding with a spatial phase difference of n°.
  • a voltage with a temporal phase difference of n° is applied to the line 160B. Therefore, the circuit formed by the first system winding 160A and the circuit formed by the second system winding 160B are balanced in voltage, so that the generation of circulating current can be prevented.
  • the circuit connected to the second inverter 171B is spatially 30° and temporally 30° ahead of the circuit connected to the first inverter 171A.
  • FIG. 9 is a diagram for explaining the difference in configuration and effect between a circuit having in-slot conductors 161 with the same thickness and a circuit having in-slot conductors 161 with different thicknesses.
  • the circuit shown on the upper side of FIG. 9 (hereinafter referred to as a first reference circuit Cr1) has a configuration in which two system windings are connected in parallel, and four in-slot conductors 161 having a thickness t are arranged in a stator core 131. ing.
  • a large AC copper loss occurs in the first layer L1 and the second layer L2.
  • the AC copper loss increases as the coil conductor is arranged on the inner diameter side.
  • the circuit shown on the lower side of FIG. and four in-slot conductors 161 having a thickness of t/2 are arranged.
  • the total cross-sectional area of the insulating coating of the coil conductors in the slot 133 increases as the number of the in-slot conductors 161 increases. Therefore, in the second reference circuit Cr2, the cross-sectional area of the conductor decreases by the increase in the cross-sectional area of the insulating coating. As a result, the electrical resistance of the coil conductor increases, which increases DC copper loss. However, the amount of increase in DC copper loss is smaller than the amount of reduction in AC copper loss. Therefore, the total copper loss can be reduced in the second reference circuit Cr2 as compared with the first reference circuit Cr1. Moreover, the copper loss of each coil conductor can be leveled.
  • the thickness of the in-slot conductors 161 of the inner coils 160ia and 160ib is half the thickness of the in-slot conductors 161 of the outer coil 160o (see FIG. 3). can get.
  • the first reference circuit Cr1 has a 2Y connection, and the current supplied to each phase winding is 200A, which is half of the current 400A of the power supply.
  • the thickness of the in-slot conductor 161 on the inner diameter side is t/2. Therefore, in order to make the current density of the winding formed by the inner diameter side coils 160ia and 160ib equivalent to that of the outer diameter side coil 160o, the current flowing through the inner diameter side coils 160ia and 160ib is reduced to 100 A, which is 1/4. There is a need. Therefore, in the second reference circuit Cr2, the parallel circuit Cp is formed by connecting the circuits Ci formed by the inner diameter side coils 160ia and 160ib in parallel.
  • the third reference circuit Cr3 includes a series circuit in which a plurality of circular windings Cw12 arranged on the first layer L1 and the second layer L2 are connected in series, and a plurality of windings arranged on the third layer L3 and the fourth layer L4.
  • a parallel circuit Cp3 is connected in parallel with a series circuit in which the winding windings Cw34 of are connected in series.
  • the teeth 134 When the slots 133 are parallel slots, the teeth 134 have a tapered shape in which the width in the circumferential direction decreases from the core back 135 toward the rotation center axis Ca.
  • the magnetic saturation is different because the teeth 134 have different widths in the circumferential direction.
  • the magnetic flux is easier to pass through and the induced voltage increases.
  • the induced voltage Vu12 generated in the windings arranged in the first layer L1 and the second layer L2 the induced voltage Vu34 generated in the windings arranged in the third layer L3 and the fourth layer L4, and
  • the magnitude relationship of the induced voltage Vu56 generated in the loop windings arranged in the fifth layer L5 and the sixth layer L6 is Vu56>Vu34>Vu12. Therefore, in the third reference circuit Cr3, a voltage imbalance occurs in the parallel circuit Cp3, and a circulating current is generated.
  • the circuit shown on the lower side of FIG. 10 (hereinafter referred to as the fourth reference circuit Cr4) has the same configuration as the second reference circuit Cr2.
  • the fourth reference circuit Cr4 is a series circuit in which the circular windings Cw12 arranged on the first layer L1 and the second layer L2 and the circular windings Cw34 arranged on the third layer L3 and the fourth layer L4 are connected in series. have a parallel circuit Cp4 connected in parallel.
  • the configuration of the parallel circuit Cp4 formed by the U1-phase winding will be described below as a representative.
  • the number of winding windings Cw12 arranged in the first layer L1 and the second layer L2 of one of the series circuits constituting the parallel circuit Cp4 and the number of the other series circuit constituting the parallel circuit Cp4 are The number of winding windings Cw12 arranged in the first layer L1 and the second layer L2 is the same.
  • the number of winding windings Cw34 arranged in the third layer L3 and the fourth layer L4 of one of the series circuits constituting the parallel circuit Cp4 and the number of the winding windings Cw34 arranged in the other series circuit constituting the parallel circuit Cp4 is the same.
  • the circuit configurations of the U2-phase winding, the V1-phase winding, the V2-phase winding, the W1-phase winding, and the W2-phase winding are similar to that of the U1-phase winding.
  • the fourth reference circuit Cr4 the voltage in the parallel circuit Cp4 formed by the inner diameter side coils 160ia and 160ib is balanced, thereby preventing the generation of circulating current. Since the second circuits C12 and C22 (see FIG. 5) according to the present embodiment have the same configuration as the parallel circuit Cp4 of the fourth reference circuit Cr4, similar effects can be obtained.
  • FIG. 11 a circuit in which a circulating current is generated between the first system winding and the second system winding, and a circuit in which a circulating current is generated between the first system winding and the second system winding.
  • Prevented circuits are described.
  • a parallel circuit in which a circuit of the first system winding 160Ac with a spatial phase of 0° and a circuit of the second system winding 160Bc with a spatial phase of 30° are connected in parallel. is formed. Therefore, a voltage imbalance occurs between the circuit formed by the first system winding 160Ac and the circuit formed by the second system winding 160Bc, and a circulating current is generated.
  • the circuit by the first system winding 160A with a spatial phase of 0° and the circuit by the second system winding 160B with a spatial phase of 30° are provided. Independent and each connected to a different inverter.
  • a temporal phase difference of 30° is given to the power supply voltage applied to the second system winding 160B having a spatial phase of 30°.
  • the voltages of the circuit formed by the first system winding 160A and the voltage of the circuit formed by the second system winding 160B are balanced, so that the occurrence of circulating current can be prevented. That is, it is possible to prevent a current difference from occurring between the circuit formed by the first system winding 160A and the circuit formed by the second system winding 160B.
  • the electric drive system 10 includes a rotating electrical machine 110 and a driving device 170 that supplies electric power to the rotating electrical machine 110 .
  • Rotating electric machine 110 has a stator 130 and a rotor 150 rotatably arranged on the inner peripheral side of stator 130 .
  • the stator 130 has a stator coil 160 made of a rectangular wire and a stator core 131 having a plurality of slots 133 in which the stator coils 160 are arranged.
  • the stator coil 160 has a plurality of system windings mounted on the stator core 131 by wave winding.
  • the plurality of system windings include a first system winding 160A attached to stator core 131 with a spatial phase difference of 0° from the reference phase, and a second system winding 160A attached to stator core 131 with a spatial phase difference of n° from the reference phase.
  • the first winding system 160A and the second winding system 160B are respectively formed by the first circuits C11 and C21 formed by the coil conductors on the outer diameter side of the stator core 131 and by the coil conductors on the inner diameter side of the stator core 131.
  • the second circuits C12 and C22 which are parallel circuits, are connected in series.
  • the coil conductors on the inner diameter side are thinner (coil height) than the coil conductors on the outer diameter side (in-slot conductors 161 of outer diameter side coil 160o).
  • the driving device 170 has a first inverter 171A connected to the first system winding 160A and a second inverter 172 connected to the second system winding 160B.
  • the driving device 170 applies voltages to the first system winding 160A and the second system winding 160B with a temporal phase difference of n°.
  • System windings 160A and 160B have a plurality of winding windings.
  • a plurality of coil conductors are radially arranged in layers in the slot 133 .
  • the second circuits C12 and C22 include first series circuits Cs11 and Cs21 in which a plurality of winding windings are connected in series and second series circuits Cs12 and Cs22 in which a plurality of winding windings are connected in series. connected in parallel.
  • the number of winding windings arranged in the s, s+1-th layers (s is an odd number from 1 to m) constituting the circuits Cs11, Cs21, and the s, s+1-th layers constituting the second series circuits Cs12, Cs22 The number of round windings arranged in .
  • ⁇ Modification 1-1> For example, as shown in FIG. 12, six coil conductors of the U1 phase winding are arranged in one of the adjacent slots 133 (slot number "1"), and the other of the adjacent slots 133 (slot number "2") is arranged. ), six coil conductors of U2 phase winding may be arranged. In this case, six in-phase coil conductors are arranged in the same slot 133 in the V-phase winding and the W-phase winding as well.
  • the magnetic flux center axis of the stator coil 160 (outer diameter side coil 160o) forming the first circuits C11 and C21 and the magnetic flux center axis of the stator coil 160 forming the second circuits C12 and C22 are aligned. Match.
  • the coil conductors of the fifth and sixth layers may be shifted by one slot with respect to the arrangement configuration shown in FIG. .
  • the magnetic flux center axis Cm1 of the stator coil 160 (outer diameter side coil 160o) that constitutes the first circuits C11 and C21 and the magnetic flux center axis Cm2 of the stator coil 160 that constitutes the second circuits C12 and C22 are It electrically has a phase difference of 30°.
  • the torque waveform diagram on the left side of FIG. 14 is a torque waveform diagram of the rotating electrical machine 110 according to the modification 1-1
  • the torque waveform diagram on the right side of FIG. 14 is the torque waveform of the rotating electrical machine 110 according to the modification 1-2. It is a diagram.
  • motor housing 191 that houses the rotating electric machine 110 and the inverter housing 197 that houses the drive device 170 are integrated by being fastened by the fastening member 17 .
  • the motor housing 191 that accommodates the rotary electric machine 110 and the inverter housing 197 that accommodates the driving device 170 may be integrally formed.
  • motor housing 191 and inverter housing 197 can be formed as one structure by casting or die casting. According to this configuration, the work of fastening the motor housing 191 and the inverter housing 197 with the fastening member 17 is not required, so the number of assembly man-hours of the electric drive system 10 can be reduced.
  • the electric drive system 10 may be configured to include three or more system windings and three or more inverters individually connected to each system winding.
  • the number of slots NSPP per phase per pole of rotating electric machine 110 matches the number of inverters. In the rotating electric machine 110 having the number of slots per pole per phase NSPP of 2, a highly efficient electric drive system 10 including two inverters and two system windings can be obtained.
  • an electric drive system having three inverters and three system windings can be obtained.
  • a rotating electrical machine of an electric drive system including three inverters and three system windings individually connected to each inverter can employ, for example, a configuration with 72 slots and 8 magnetic poles.
  • the electric drive system 10 mounted on an automobile has been described as an example, but the present invention is not limited to this.
  • the present invention can be applied to various moving bodies such as elevators, railway vehicles, and the like, which generate driving force by rotating electric machines. It should be noted that the electric drive system is not limited to being mounted on a moving body.
  • Control circuit (control device) , 179... Power storage device (power supply device) 190... Case 191... Motor housing 197... Inverter housing 198... Gear housing C11... First circuit C12... Second circuit C21... First circuit C22... Second circuit, Ca... rotation center axis, Cm1, Cm2... magnetic flux center axis

Abstract

This electric drive system comprises a rotating electric machine and a drive device. The stator coil of the rotating electric machine has: a first system winding (160A) mounted on a stator core with a spatial phase difference of 0° with respect to a reference phase; and a second system winding (160B) mounted on the stator core with a spatial phase difference of n° with respect to the reference phase. The first and second system windings (160A, 160B) each have a first circuit (C11, C21) and a second circuit (C12, C22) which are connected in series, said first circuit (C11, C21) being formed by an outer diameter side coil, said second circuit (C12, C22) being a parallel circuit formed by an inner diameter side coil having a smaller thickness than that of the outer diameter side coil. The drive device has first and second inverters (171A, 171B) connected to the first and second system windings (160A, 160B) and applies voltage to the first and second system windings (160A, 160B) with the spatial phase difference of n°.

Description

電動駆動システムelectric drive system
　本発明は、電動駆動システムに関する。 The present invention relates to an electric drive system.
　ステータとロータを備え、ステータコイルに電力を供給することで回転磁界を発生させ、この回転磁界によってロータを回転させる回転電機が知られている（特許文献１参照）。特許文献１には、ヘリカル巻シート状コイルが、シート厚さ方向に複数枚積層されて電気的に接続された３相回転電機のステータコイルが開示されている。ヘリカル巻シート状コイルは、コイル導体が、ヘリカル状につながり波巻き構成となるようにステータコアに巻装されている。 A rotating electric machine is known that includes a stator and a rotor, supplies electric power to a stator coil to generate a rotating magnetic field, and rotates the rotor by the rotating magnetic field (see Patent Document 1). Patent Literature 1 discloses a stator coil for a three-phase rotating electrical machine in which a plurality of helically wound sheet-like coils are laminated in the sheet thickness direction and electrically connected. The helically-wound sheet-like coil is wound around the stator core so that the coil conductor is helically connected to form a wave-wound structure.
　複数枚のヘリカル巻シート状コイルは、ヘリカル巻シート状コイル間において同相の相コイルが直列接続されている直列接続部と、ヘリカル巻シート状コイル間において同相の相コイルが並列接続されている並列接続部と、を有する。特許文献１に記載の回転電機では、ロータ近辺のコイル導体に発生する交流銅損を低減することにより、回転電機の高効率化を図るために、ロータに近接する並列接続部のコイル導体の導体断面積が、直列接続部のコイル導体の導体断面積の並列数分の１とされている。 The plurality of helical-wound sheet-like coils includes a series connection portion in which in-phase phase coils are connected in series between the helical-wound sheet-like coils, and a parallel connection portion in which in-phase phase coils are connected in parallel between the helical-wound sheet-like coils. a connector; In the rotating electrical machine described in Patent Document 1, in order to improve the efficiency of the rotating electrical machine by reducing the AC copper loss generated in the coil conductor near the rotor, the conductor of the coil conductor in the parallel connection portion close to the rotor is reduced. The cross-sectional area is set to 1/the parallel number of the conductor cross-sectional area of the coil conductor of the series connection portion.
特開２０１４－０９０６１５号公報JP 2014-090615 A
　回転電機を駆動する電動駆動システムでは、ステータコイルによって並列回路が形成される場合に、循環電流に起因した損失が発生することがある。このため、並列回路が形成される場合には、循環電流の発生を防止することが重要である。 In an electric drive system that drives a rotating electrical machine, loss due to circulating current may occur when a parallel circuit is formed by stator coils. Therefore, when a parallel circuit is formed, it is important to prevent the generation of circulating current.
　本発明は、交流銅損を低減し、かつ循環電流の発生を防止することにより、高効率の電動駆動システムを提供することを目的とする。 An object of the present invention is to provide a highly efficient electric drive system by reducing AC copper loss and preventing the generation of circulating current.
　本発明の一態様による電動駆動システムは、ステータと前記ステータの内周側に回転可能に配置されるロータとを有する回転電機と、前記回転電機に電力を供給する駆動装置と、を備える。前記ステータは、平角線からなるステータコイルと、前記ステータコイルが配置される複数のスロットを有するステータコアと、を有する。前記ステータコイルは、前記ステータコアに波巻きで装着される複数の系統巻線を有する。前記複数の系統巻線は、基準位相と空間的に位相差０°で前記ステータコアに装着される第１系統巻線と、前記基準位相と空間的に位相差ｎ°で前記ステータコアに装着される第２系統巻線と、を有する。前記ｎ°は、３６０°／（前記スロットの数／極対数）である。前記第１系統巻線及び前記第２系統巻線は、それぞれ、前記ステータコアの外径側のコイル導体により形成される第１回路と、前記ステータコアの内径側のコイル導体により形成される並列回路である第２回路と、が直列に接続される。前記内径側のコイル導体は、前記外径側のコイル導体よりも厚みが小さい。前記駆動装置は、前記第１系統巻線に接続される第１インバータと、前記第２系統巻線に接続される第２インバータと、を有する。前記駆動装置は、前記第１系統巻線及び前記第２系統巻線に対し、時間的に前記ｎ°の位相差で電圧を印加する。 An electric drive system according to one aspect of the present invention includes a rotating electric machine having a stator and a rotor rotatably arranged on the inner peripheral side of the stator, and a driving device that supplies electric power to the rotating electric machine. The stator has a stator coil made of a rectangular wire and a stator core having a plurality of slots in which the stator coil is arranged. The stator coil has a plurality of system windings that are wave-wound on the stator core. The plurality of system windings include a first system winding mounted on the stator core with a spatial phase difference of 0° from a reference phase, and a first system winding mounted on the stator core with a spatial phase difference of n° from the reference phase. and a second system winding. Said n° is 360°/(number of slots/number of pole pairs). The first winding system and the second winding system are respectively a first circuit formed by a coil conductor on the outer diameter side of the stator core and a parallel circuit formed by a coil conductor on the inner diameter side of the stator core. A certain second circuit is connected in series. The coil conductor on the inner diameter side is thinner than the coil conductor on the outer diameter side. The drive device has a first inverter connected to the first winding system and a second inverter connected to the second winding system. The drive device applies voltages to the first winding system and the second winding system with the n° phase difference in terms of time.
　本発明によれば、交流銅損を低減し、かつ循環電流の発生を防止することにより、高効率の電動駆動システムを提供することができる。 According to the present invention, a highly efficient electric drive system can be provided by reducing AC copper loss and preventing the generation of circulating current.
図１は電動駆動システムの構成を示す図であるFIG. 1 is a diagram showing the configuration of an electric drive system. 図２は電動駆動システムの側面断面模式図である。FIG. 2 is a schematic side cross-sectional view of the electric drive system. 図３は回転電機の一部を示す平面断面模式図であるFIG. 3 is a schematic cross-sectional plan view showing a part of the rotary electric machine. 図４はステータの斜視図であり、ステータの一端側を示す。FIG. 4 is a perspective view of the stator, showing one end side of the stator. 図５はステータコイルの結線図である。FIG. 5 is a connection diagram of the stator coil. 図６はステータコアのスロット内に配置される相巻線の位置を説明するための模式図である。FIG. 6 is a schematic diagram for explaining the positions of the phase windings arranged in the slots of the stator core. 図７は第１回路と第２回路の接続構造について説明する図である。FIG. 7 is a diagram for explaining the connection structure between the first circuit and the second circuit. 図８はＵ１相巻線及びＵ２相巻線に発生する誘起電圧について説明する図である。FIG. 8 is a diagram for explaining the induced voltages generated in the U1-phase winding and the U2-phase winding. 図９は、同じ厚みのスロット内導体を有する回路と、異なる厚みのスロット内導体を有する回路との構成及び効果の違いについて説明する図である。FIG. 9 is a diagram for explaining differences in configuration and effect between a circuit having in-slot conductors of the same thickness and a circuit having in-slot conductors of different thicknesses. 図１０は、循環電流が発生する並列回路Ｃｐ３と、循環電流の発生が防止された並列回路Ｃｐ４について説明する図である。FIG. 10 is a diagram illustrating a parallel circuit Cp3 in which a circulating current is generated and a parallel circuit Cp4 in which the generation of circulating current is prevented. 図１１は、第１系統巻線と第２系統巻線との間で循環電流が発生する回路と、第１系統巻線と第２系統巻線との間で循環電流の発生が防止された回路について説明する図である。FIG. 11 shows a circuit in which a circulating current is generated between the first system winding and the second system winding, and a circuit in which the generation of circulating current is prevented between the first system winding and the second system winding. It is a figure explaining a circuit. 図１２は、本実施形態の変形例１－１に係るステータコイルの配置構成について示す図である。FIG. 12 is a diagram showing an arrangement configuration of stator coils according to modification 1-1 of the present embodiment. 図１３は、本実施形態の変形例１－２に係るステータコイルの配置構成について示す図である。FIG. 13 is a diagram showing the arrangement configuration of stator coils according to modification 1-2 of the present embodiment. 図１４は、本実施形態の変形例１－１及び変形例１－２に係る回転電機のトルク波形図である。FIG. 14 is a torque waveform diagram of the rotary electric machines according to Modifications 1-1 and 1-2 of the present embodiment. 図１５は、本実施形態の変形例２に係る電動駆動システムの側面断面模式図である。FIG. 15 is a schematic side cross-sectional view of an electric drive system according to Modification 2 of the present embodiment.
　図面を参照して、本発明の実施形態に係る電動駆動システムについて説明する。本実施形態に係る電動駆動システムは、自動車の走行の駆動源として用いることが好適な電動駆動システムである。本実施形態に係る電動駆動システムは、例えば、エンジンと回転電機の双方によって駆動されるハイブリッド型の電気自動車、回転電機のみによって走行する純粋な電気自動車に適用できる。 An electric drive system according to an embodiment of the present invention will be described with reference to the drawings. The electric drive system according to the present embodiment is an electric drive system suitable for use as a drive source for running an automobile. The electric drive system according to this embodiment can be applied to, for example, a hybrid electric vehicle driven by both an engine and a rotating electric machine, and a pure electric vehicle running only by a rotating electric machine.
　図１は電動駆動システム１０の構成を示す図であり、図２は電動駆動システム１０の側面断面模式図である。図１及び図２に示すように、電動駆動システム１０は、回転電機１１０と、回転電機１１０に電力を供給する駆動装置１７０と、を備える。図１に示すように、駆動装置１７０は、蓄電装置１７９と、第１インバータ１７１Ａと、第２インバータ１７１Ｂと、制御回路基板１７５と、駆動回路基板１７３Ａ，１７３Ｂと、回転電機１１０の電流を検出する電流センサ１７２Ａ，１７２Ｂとを備えている。 FIG. 1 is a diagram showing the configuration of the electric drive system 10, and FIG. 2 is a schematic side sectional view of the electric drive system 10. As shown in FIG. As shown in FIGS. 1 and 2 , the electric drive system 10 includes a rotating electrical machine 110 and a drive device 170 that supplies electric power to the rotating electrical machine 110 . As shown in FIG. 1 , drive device 170 detects electric currents of power storage device 179 , first inverter 171 A, second inverter 171 B, control circuit board 175 , drive circuit boards 173 A and 173 B, and rotating electric machine 110 . and current sensors 172A and 172B.
　蓄電装置１７９は、キャパシタ、あるいはリチウムイオン電池、ニッケル水素電池などの二次電池で構成され、２５０ボルトから６００ボルト、あるいはそれ以上の高電圧の直流電力を出力する電源装置である。蓄電装置１７９は、力行走行時には回転電機１１０に電力を供給し、回生走行時には回転電機１１０から電力を受ける。蓄電装置１７９と回転電機１１０との間の電力の授受は、電力変換装置である第１インバータ１７１Ａ及び第２インバータ１７１Ｂを介して行われる。 The power storage device 179 is a power supply device that is composed of a capacitor or a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery, and outputs high-voltage DC power of 250 V to 600 V or more. Power storage device 179 supplies electric power to rotating electric machine 110 during power running, and receives electric power from rotating electric machine 110 during regenerative running. Electric power is exchanged between power storage device 179 and rotary electric machine 110 via first inverter 171A and second inverter 171B, which are power conversion devices.
　回転電機１１０による回転トルクは、変速機１８０（図２参照）とデファレンシャルギア（不図示）を介して車輪に伝達され、電気自動車（車両とも記す）が走行する。駆動装置１７０は、統合制御装置（不図示）からのトルク指令に基づき、指令通りのトルク出力あるいは発電電力が発生するように回転電機１１０を制御する。 The rotational torque generated by the rotating electric machine 110 is transmitted to the wheels via the transmission 180 (see FIG. 2) and the differential gear (not shown), and the electric vehicle (also referred to as vehicle) runs. Drive device 170 controls rotating electric machine 110 based on a torque command from an integrated control device (not shown) so that torque output or power generation according to the command is generated.
　第１インバータ１７１Ａ及び第２インバータ１７１Ｂは、複数のパワー半導体素子を有する。駆動装置１７０は、統合制御装置（不図示）からの指令に基づきパワー半導体素子のスイッチング動作を制御する。パワー半導体素子のスイッチング動作により、回転電機１１０は電動機としてあるいは発電機として運転される。第１インバータ１７１Ａ及び第２インバータ１７１Ｂは、ＤＣ電圧からパワー半導体素子のスイッチング動作（オン・オフ）により矩形波を生成し、模擬的に交流電圧を生成する。駆動装置１７０は、パワー半導体素子のスイッチング動作の周期やタイミングを制御することにより、交流電圧の大きさや周波数を制御する。 The first inverter 171A and the second inverter 171B have a plurality of power semiconductor elements. The driving device 170 controls the switching operation of the power semiconductor elements based on commands from an integrated control device (not shown). The switching operation of the power semiconductor elements causes rotating electric machine 110 to operate as a motor or as a generator. The first inverter 171A and the second inverter 171B generate a rectangular wave from the DC voltage by switching operation (ON/OFF) of the power semiconductor element, and generate a simulated AC voltage. The driving device 170 controls the magnitude and frequency of the AC voltage by controlling the period and timing of the switching operation of the power semiconductor element.
　第１インバータ１７１Ａと第２インバータ１７１Ｂとは同一の蓄電装置（電源装置）１７９に接続されている。つまり、第１インバータ１７１Ａと第２インバータ１７１ＢのＤＣリンク電圧が共有化されている。この構成では、１つの蓄電装置１７９のＤＣリンク電圧から、２つのインバータ１７１Ａ，１７１Ｂによって２つの電圧を出力することができる。また、ＤＣリンク電圧を共有化することにより、電動駆動システム１０を低コスト化できる。 The first inverter 171A and the second inverter 171B are connected to the same power storage device (power supply device) 179 . That is, the DC link voltage is shared between the first inverter 171A and the second inverter 171B. In this configuration, two voltages can be output from the DC link voltage of one power storage device 179 by two inverters 171A and 171B. Also, by sharing the DC link voltage, the cost of the electric drive system 10 can be reduced.
　回転電機１１０を電動機として運転する場合は、蓄電装置１７９からの直流電力が第１インバータ１７１Ａ及び第２インバータ１７１Ｂの直流端子に供給される。駆動装置１７０は、パワー半導体素子のスイッチング動作を制御して供給された直流電力を３相交流電力に変換し、回転電機１１０に供給する。一方、回転電機１１０を発電機として運転する場合には、回転電機１１０のロータが外部から加えられる回転トルクで回転駆動され、ステータコイルに３相交流電力が発生する。発生した３相交流電力は駆動装置１７０で直流電力に変換され、その直流電力が蓄電装置１７９に供給されることにより、蓄電装置１７９が充電される。 When the rotating electrical machine 110 is operated as an electric motor, the DC power from the power storage device 179 is supplied to the DC terminals of the first inverter 171A and the second inverter 171B. Drive device 170 controls the switching operation of the power semiconductor element, converts the supplied DC power into three-phase AC power, and supplies the three-phase AC power to rotary electric machine 110 . On the other hand, when rotating electrical machine 110 is operated as a generator, the rotor of rotating electrical machine 110 is rotationally driven by a rotational torque applied from the outside, and three-phase AC power is generated in the stator coils. The generated three-phase AC power is converted into DC power by drive device 170, and the DC power is supplied to power storage device 179, whereby power storage device 179 is charged.
　駆動回路基板１７３Ａには、第１インバータ１７１Ａのパワー半導体素子のスイッチング動作を制御する駆動回路１７４Ａが設けられている。駆動回路基板１７３Ｂには、第２インバータ１７１Ｂのパワー半導体素子のスイッチング動作を制御する駆動回路１７４Ｂが設けられている。 The drive circuit board 173A is provided with a drive circuit 174A that controls the switching operation of the power semiconductor elements of the first inverter 171A. The drive circuit board 173B is provided with a drive circuit 174B that controls the switching operation of the power semiconductor elements of the second inverter 171B.
　制御回路基板１７５には、駆動回路１７４Ａ，１７４Ｂに制御信号を出力する制御回路１７６が設けられている。駆動回路１７４Ａ，１７４Ｂは、制御回路１７６から出力された制御信号に基づいて、パワー半導体素子を駆動させるための駆動信号を発生する。 The control circuit board 175 is provided with a control circuit 176 that outputs control signals to the drive circuits 174A and 174B. Drive circuits 174A and 174B generate drive signals for driving the power semiconductor elements based on control signals output from control circuit 176 .
　制御回路１７６は各インバータ１７１Ａ，１７１Ｂを制御する制御装置を構成している。制御回路１７６は、複数のパワー半導体素子を動作（オン・オフ）させるための制御信号（制御値）を演算するマイクロコンピュータによって構成される。制御回路１７６には、統合制御装置（不図示）からのトルク指令信号（トルク指令値）、電流センサ１７２Ａ，１７２Ｂのセンサ出力、回転電機１１０に搭載された回転センサ（不図示）のセンサ出力が入力される。制御回路１７６は、それらの入力信号に基づいて制御値を演算し、駆動回路１７４Ａ，１７４Ｂにパワー半導体素子のスイッチング動作を制御するための制御信号（指令）を出力する。 The control circuit 176 constitutes a control device that controls the inverters 171A and 171B. The control circuit 176 is composed of a microcomputer that calculates control signals (control values) for operating (turning on/off) a plurality of power semiconductor devices. The control circuit 176 receives a torque command signal (torque command value) from an integrated control device (not shown), sensor outputs of the current sensors 172A and 172B, and sensor outputs of a rotation sensor (not shown) mounted on the rotary electric machine 110. is entered. The control circuit 176 calculates control values based on those input signals, and outputs control signals (instructions) for controlling switching operations of the power semiconductor elements to the drive circuits 174A and 174B.
　制御回路１７６、第１インバータ１７１Ａと第２インバータ１７１Ｂとで共通に使用される。つまり、第１インバータ１７１Ａと第２インバータ１７２には同一の制御回路（制御装置）１７６からの指令が入力される。制御回路１７６を共通化することにより、電動駆動システム１０を低コスト化できる。 It is commonly used by the control circuit 176, the first inverter 171A and the second inverter 171B. That is, commands from the same control circuit (control device) 176 are input to the first inverter 171A and the second inverter 172 . By sharing the control circuit 176, the cost of the electric drive system 10 can be reduced.
　図２を参照して、電動駆動システム１０の構造について説明する。図２に示すように、電動駆動システム１０は、回転電機１１０と、駆動装置１７０と、変速機１８０と、それらを収容する筐体１９０と、を備える。 The structure of the electric drive system 10 will be described with reference to FIG. As shown in FIG. 2, the electric drive system 10 includes a rotating electrical machine 110, a drive device 170, a transmission 180, and a housing 190 that accommodates them.
　筐体１９０は、回転電機１１０を収容するモータハウジング１９１と、駆動装置１７０を収容するインバータハウジング１９７と、変速機１８０を収容するギヤハウジング１９８と、を有する。モータハウジング１９１とインバータハウジング１９７とは、ボルト、ナット等の締結部材１７によって締結されることにより一体化されている。回転電機１１０と駆動装置１７０が１パッケージ化されているため、回転電機１１０と駆動装置１７０を個別に車両へ取り付ける場合に比べて、車両への取付作業を向上できる。また、回転電機１１０と駆動装置１７０とを別々に配置させる場合に比べてケーブルを省略することができる。これにより、電動駆動システム１０の軽量化を図ることができ、さらにノイズを低減することもできる。 The housing 190 has a motor housing 191 that houses the rotating electric machine 110 , an inverter housing 197 that houses the driving device 170 , and a gear housing 198 that houses the transmission 180 . The motor housing 191 and the inverter housing 197 are integrated by being fastened by fastening members 17 such as bolts and nuts. Since the rotating electric machine 110 and the drive device 170 are packaged into one package, the mounting work to the vehicle can be improved compared to the case where the rotating electric machine 110 and the drive device 170 are individually mounted to the vehicle. In addition, cables can be omitted compared to the case where rotating electric machine 110 and drive device 170 are separately arranged. As a result, the weight of the electric drive system 10 can be reduced, and noise can be reduced.
　ギヤハウジング１９８は、図示しない締結部材によりモータハウジング１９１に締結される。 The gear housing 198 is fastened to the motor housing 191 by fastening members (not shown).
　回転電機１１０は、例えば、永久磁石埋込型の三相同期電動発電機である。回転電機１１０は、モータハウジング１９１に固定された円筒状のステータ１３０と、ステータ１３０の内周側に隙間をあけて回転可能に配置される円筒状のロータ１５０とを有する。なお、以下の説明において、「軸方向」、「周方向」、「径方向」とは、次のとおりである。「軸方向」とは、回転電機１１０（ロータ１５０）の回転中心軸Ｃａに沿う方向である。なお、回転中心軸Ｃａは、ステータ１３０の中心軸と一致する。「周方向」とは、回転電機１１０の回転方向（ロータ１５０の回転方向）に沿う方向、すなわち軸方向に直交しかつ回転中心軸Ｃａを中心とする円周方向である。「径方向」とは、回転電機１１０の回転中心軸Ｃａ及び周方向に直交する方向、すなわち半径方向である。また、「内周側」は径方向内側（内径側）を指し、「外周側」はその逆方向、すなわち径方向外側（外径側）のことを指す。 The rotating electrical machine 110 is, for example, a permanent magnet embedded three-phase synchronous motor generator. The rotating electric machine 110 has a cylindrical stator 130 fixed to a motor housing 191 and a cylindrical rotor 150 rotatably arranged on the inner peripheral side of the stator 130 with a gap therebetween. In the following description, "axial direction", "circumferential direction", and "radial direction" are as follows. "Axial direction" is a direction along the rotation center axis Ca of the rotary electric machine 110 (rotor 150). Note that the rotation center axis Ca coincides with the center axis of the stator 130 . The “circumferential direction” is a direction along the direction of rotation of rotating electric machine 110 (the direction of rotation of rotor 150), that is, a circumferential direction orthogonal to the axial direction and centered on rotation center axis Ca. A “radial direction” is a direction orthogonal to the rotation center axis Ca of the rotating electric machine 110 and the circumferential direction, that is, the radial direction. In addition, the “inner peripheral side” refers to the radially inner side (inner diameter side), and the “outer peripheral side” refers to the opposite direction, that is, the radial outer side (outer diameter side).
　図３及び図４を参照して、ステータ１３０について説明する。図３は回転電機１１０の一部を示す平面断面模式図であり、図４はステータ１３０の斜視図であり、ステータ１３０の一端側を示す。図３及び図４に示すように、ステータ１３０は、円筒状のステータコア１３１と、ステータコア１３１に装着されるステータコイル１６０とを有する。ステータコア１３１は、例えば、円環形状の電磁鋼板を複数枚積層することにより形成される。ステータコア１３１は、モータハウジング１９１（図２参照）の内側に嵌合固定される。 The stator 130 will be described with reference to FIGS. 3 and 4. FIG. 3 is a schematic cross-sectional plan view showing a portion of rotating electric machine 110, and FIG. 4 is a perspective view of stator 130 showing one end side of stator 130. As shown in FIG. As shown in FIGS. 3 and 4 , stator 130 has a cylindrical stator core 131 and stator coils 160 mounted on stator core 131 . The stator core 131 is formed, for example, by laminating a plurality of annular magnetic steel sheets. The stator core 131 is fitted and fixed inside the motor housing 191 (see FIG. 2).
　ステータコア１３１の内周部には、ステータコア１３１の中心軸方向に平行な複数（本実施形態では４８個）のスロット１３３が形成される。スロット１３３は、ステータコア１３１の径方向に沿って互いに平行な側面を有する半閉平行スロットである。つまり、スロット１３３は、外周端からティース１３４の鍔部まで一定の周方向幅を有する。スロット１３３には、ステータコイル１６０を構成するＵ相、Ｖ相、Ｗ相の複数の相巻線が配置される。複数のスロット１３３は、ステータコア１３１の円周方向に等間隔で形成される。 A plurality of (48 slots in this embodiment) slots 133 are formed in the inner peripheral portion of the stator core 131 parallel to the central axis direction of the stator core 131 . The slots 133 are semi-closed parallel slots having side surfaces parallel to each other along the radial direction of the stator core 131 . That is, the slot 133 has a constant circumferential width from the outer peripheral end to the flange of the tooth 134 . A plurality of phase windings of U-phase, V-phase, and W-phase that constitute stator coil 160 are arranged in slots 133 . A plurality of slots 133 are formed at regular intervals in the circumferential direction of stator core 131 .
　スロット１３３間にはティース１３４が形成される。複数のティース１３４は環状のコアバック１３５から回転中心軸Ｃａに向かって突出するように形成されている。ティース１３４は径方向の磁路を形成し、コアバック１３５は周方向の磁路を形成する。ティース１３４は、ステータコイル１６０によって発生した回転磁界をロータ１５０に導き、ロータ１５０に回転トルクを発生させる。 Teeth 134 are formed between the slots 133 . A plurality of teeth 134 are formed to protrude from an annular core back 135 toward the rotation center axis Ca. The teeth 134 form radial magnetic paths, and the core backs 135 form circumferential magnetic paths. The teeth 134 guide the rotating magnetic field generated by the stator coil 160 to the rotor 150 and cause the rotor 150 to generate rotating torque.
　図２及び図３を参照して、ロータ１５０について説明する。図２及び図３に示すように、ロータ１５０は、ロータコア１５１と、ロータコア１５１に固定される複数の永久磁石１５２と、ロータコア１５１の貫通孔に固定されるシャフト１５９とを備える。図２に示すように、シャフト１５９が筐体１９０に設けられた複数の軸受によって支承されることにより、ロータ１５０がステータコア１３１の内側で回転可能に保持される。 The rotor 150 will be described with reference to FIGS. 2 and 3. FIG. As shown in FIGS. 2 and 3 , rotor 150 includes rotor core 151 , multiple permanent magnets 152 fixed to rotor core 151 , and shaft 159 fixed to a through hole of rotor core 151 . As shown in FIG. 2 , the rotor 150 is rotatably held inside the stator core 131 by supporting the shaft 159 with a plurality of bearings provided in the housing 190 .
　ロータコア１５１は、例えば、円環形状の電磁鋼板を複数枚積層することにより形成される。永久磁石１５２は、ロータ１５０の界磁極を形成する。永久磁石１５２には、ネオジウム系、サマリウム系の焼結磁石、フェライト磁石、ネオジウム系のボンド磁石などを用いることができる。 The rotor core 151 is formed, for example, by laminating a plurality of annular electromagnetic steel sheets. Permanent magnets 152 form the field poles of rotor 150 . For the permanent magnet 152, a neodymium-based or samarium-based sintered magnet, a ferrite magnet, a neodymium-based bond magnet, or the like can be used.
　図３に示すように、ロータコア１５１には、直方体形状の磁石挿入孔１５３が外周部近傍において周方向に等間隔で形成されており、各磁石挿入孔１５３には永久磁石１５２が埋め込まれ、接着剤などで固定されている。磁石挿入孔１５３の周方向の幅は、永久磁石１５２の周方向の幅よりも大きい。永久磁石１５２の周方向両端と磁石挿入孔１５３の周方向両端との間には磁気的空隙が形成される。この磁気的空隙には接着剤を埋め込んでもよいし、樹脂で永久磁石１５２と一体に固めてもよい。 As shown in FIG. 3, in the rotor core 151, rectangular parallelepiped magnet insertion holes 153 are formed in the vicinity of the outer peripheral portion at regular intervals in the circumferential direction. It is fixed with an agent. The circumferential width of the magnet insertion hole 153 is larger than the circumferential width of the permanent magnet 152 . A magnetic gap is formed between the circumferential ends of the permanent magnet 152 and the circumferential ends of the magnet insertion hole 153 . An adhesive may be embedded in this magnetic gap, or it may be integrally fixed with the permanent magnet 152 with resin.
　永久磁石１５２の磁化方向は径方向を向いており、界磁極毎に磁化方向の向きが反転している。つまり、ある磁極を形成するための永久磁石１５２のステータ１３０側の面がＮ極、シャフト１５９側の面がＳ極に磁化されていたとすると、隣の磁極を形成する永久磁石１５２のステータ１３０側の面はＳ極、シャフト１５９側の面はＮ極に磁化されている。 The magnetization direction of the permanent magnet 152 is radial, and the magnetization direction is reversed for each field pole. In other words, if the surface of the permanent magnet 152 on the side of the stator 130 for forming a certain magnetic pole is magnetized to the N pole and the surface on the side of the shaft 159 is magnetized to the S pole, the permanent magnet 152 that forms the next magnetic pole is magnetized on the side of the stator 130 . is magnetized to the S pole, and the surface on the shaft 159 side is magnetized to the N pole.
　図３～図７を参照してステータコイル１６０について説明する。図４に示すように、ステータコア１３１には、ステータコイル１６０が分布巻き（波巻き）で巻き回されている。分布巻きとは、複数のスロット１３３を跨いで離間した二つのスロット１３３に相巻線が収納されるように、相巻線がステータコア１３１に巻かれる巻線方式である。 The stator coil 160 will be described with reference to FIGS. 3 to 7. FIG. As shown in FIG. 4, a stator coil 160 is wound around the stator core 131 by distributed winding (wave winding). Distributed winding is a winding method in which a phase winding is wound around the stator core 131 so that the phase winding is accommodated in two slots 133 that are spaced across a plurality of slots 133 .
　ステータコイル１６０は、Ｕ字形状の複数のセグメント導体１６５が波状に接続されることで形成される。セグメント導体１６５は、中央部がステータ１３０の軸方向一方のコイルエンド１６２Ａを構成する。セグメント導体１６５の両側の端部は、溶接されてステータ１３０の軸方向他方のコイルエンド１６２Ｂを構成する。 The stator coil 160 is formed by connecting a plurality of U-shaped segment conductors 165 in a wave shape. The central portion of the segment conductor 165 constitutes one coil end 162A of the stator 130 in the axial direction. Both ends of the segment conductor 165 are welded to constitute the other axial coil end 162B of the stator 130 .
　図３及び図４に示すように、ステータコイル１６０は、ステータコア１３１のスロット１３３内に配置されるコイル導体（以下、スロット内導体と記す）１６１と、ステータコア１３１の両端からスロット１３３外に突出して配置されるコイル導体であるコイルエンド１６２Ａ，１６２Ｂとを有する。ステータコイル１６０は、断面が矩形状であり、例えば、銅を主成分とした導体（導線）にエナメル被膜等の絶縁被膜が覆われた平角線により形成される。スロット１３３内に配置されるスロット内導体１６１は、その径方向の長さ（以下、コイル高さとも記す）Ｈｉ，Ｈｏが、その周方向の長さ（以下、コイル幅とも記す）Ｂに比べて小さい。 As shown in FIGS. 3 and 4 , the stator coil 160 includes coil conductors (hereinafter referred to as in-slot conductors) 161 arranged in the slots 133 of the stator core 131 and protruding outside the slots 133 from both ends of the stator core 131 . It has coil ends 162A and 162B which are arranged coil conductors. The stator coil 160 has a rectangular cross section and is formed of, for example, a rectangular wire in which a conductor (conductor wire) mainly composed of copper is covered with an insulating film such as an enamel film. The in-slot conductor 161 arranged in the slot 133 has a radial length (hereinafter also referred to as coil height) Hi and Ho compared to a circumferential length (hereinafter also referred to as coil width) B. small.
　図３のスロット拡大図に示すように、１つのスロット１３３内に、矩形断面を有する６本のスロット内導体１６１が径方向に１列に並んで配置されている。つまり、スロット１３３には、複数のスロット内導体（コイル導体）１６１が、径方向に層状に配置されている。以下、各スロット内導体１６１が配置されるスロット１３３内のコイル導体の収容部を、スロット１３３の内周側（スロット開口側）から外周側に向かって順に１層目Ｌ１、２層目Ｌ２、３層目Ｌ３、４層目Ｌ４、５層目Ｌ５、６層目Ｌ６と称する。 As shown in the enlarged view of the slot in FIG. 3, six in-slot conductors 161 having a rectangular cross section are arranged in a row in the radial direction in one slot 133 . That is, in the slot 133, a plurality of in-slot conductors (coil conductors) 161 are arranged in layers in the radial direction. In the following, the accommodating portions for the coil conductors in the slots 133 in which the in-slot conductors 161 are arranged are arranged in order from the inner peripheral side (slot opening side) of the slot 133 toward the outer peripheral side as the first layer L1, the second layer L2, They are called the third layer L3, the fourth layer L4, the fifth layer L5, and the sixth layer L6.
　スロット１３３の１層目Ｌ１及び２層目Ｌ２に配置されるコイル導体を第１内径側コイル１６０ｉａと記し、スロット１３３の３層目Ｌ３及び４層目Ｌ４に配置されるコイル導体を第２内径側コイル１６０ｉｂと記し、スロット１３３の５層目Ｌ５及び６層目Ｌ６に配置されるコイル導体を外径側コイル１６０ｏと記す。つまり、外径側コイル１６０ｏは、ステータコア１３１の外径側に配置されるコイル導体により形成され、内径側コイル１６０ｉａ，１６０ｉｂは、ステータコア１３１の内径側に配置されるコイル導体により形成される。 The coil conductors arranged on the first layer L1 and the second layer L2 of the slot 133 are referred to as a first inner diameter side coil 160ia, and the coil conductors arranged on the third layer L3 and the fourth layer L4 of the slot 133 are referred to as the second inner diameter coil 160ia. The coil conductors arranged in the fifth layer L5 and the sixth layer L6 of the slot 133 are referred to as outer diameter side coils 160o. That is, the outer coil 160o is formed by a coil conductor arranged on the outer diameter side of the stator core 131, and the inner coils 160ia and 160ib are formed by coil conductors arranged on the inner diameter side of the stator core 131.
　第１内径側コイル１６０ｉａ及び第２内径側コイル１６０ｉｂのスロット内導体１６１のコイル高さ（厚み）Ｈｉは、外径側コイル１６０ｏのスロット内導体１６１のコイル高さ（厚み）Ｈｏよりも小さい（Ｈｉ＜Ｈｏ）。本実施形態では、第１内径側コイル１６０ｉａ及び第２内径側コイル１６０ｉｂのスロット内導体１６１のコイル高さ（厚み）Ｈｉは、外径側コイル１６０ｏのスロット内導体１６１のコイル高さ（厚み）Ｈｏの半分である（Ｈｉ＝（１／２）Ｈｏ）。 The coil height (thickness) Hi of the in-slot conductor 161 of the first inner diameter side coil 160ia and the second inner diameter side coil 160ib is smaller than the coil height (thickness) Ho of the in-slot conductor 161 of the outer diameter side coil 160o ( Hi<Ho). In this embodiment, the coil height (thickness) Hi of the slot conductor 161 of the first inner diameter coil 160ia and the second inner diameter coil 160ib is the coil height (thickness) of the slot conductor 161 of the outer coil 160o. It is half of Ho (Hi=(1/2)Ho).
　スロット１３３の内周面とスロット内導体（コイル導体）１６１との間、及び、スロット１３３内の複数のスロット内導体（コイル導体）１６１同士の間には、絶縁材１６９が設けられている。絶縁材１６９は、例えば、ワニスであり、スロット１３３の内周面とコイル導体との間及び隣接するコイル導体間に充填される。なお、絶縁材１６９は、非導電性の物質であればよく、ワニスに限定されない。例えば、絶縁材１６９には、絶縁紙を採用してもよい。スロット１３３内に絶縁紙を設けた上でワニスを充填してもよい。これにより、回転電機１１０の絶縁信頼性を向上することができる。 An insulating material 169 is provided between the inner peripheral surface of the slot 133 and the in-slot conductor (coil conductor) 161 and between the plurality of in-slot conductors (coil conductors) 161 in the slot 133 . The insulating material 169 is, for example, varnish, and is filled between the inner peripheral surface of the slot 133 and the coil conductors and between adjacent coil conductors. Note that the insulating material 169 is not limited to varnish as long as it is a non-conductive material. For example, insulating paper may be used as the insulating material 169 . The slot 133 may be filled with insulating paper and then filled with varnish. Thereby, the insulation reliability of rotating electric machine 110 can be improved.
　図５はステータコイル１６０の結線図である。ステータコイル１６０は、ステータコア１３１に波巻きで装着される複数の系統巻線を有している。本実施形態では、ステータコイル１６０は、第１インバータ１７１Ａに接続される第１系統巻線１６０Ａと、第２インバータ１７１Ｂに接続される第２系統巻線１６０Ｂとを有している。第１系統巻線１６０Ａは、Ｕ１，Ｖ１，Ｗ１の相巻線で構成され、第２系統巻線１６０Ｂは、Ｕ２，Ｖ２，Ｗ２の相巻線で構成される。各相巻線（Ｕ１，Ｕ２，Ｖ１，Ｖ２，Ｗ１，Ｗ２相巻線）は、スロット１３３によって相互に適正な間隔をもって配列される。 FIG. 5 is a connection diagram of the stator coil 160. FIG. The stator coil 160 has a plurality of system windings mounted on the stator core 131 by wave winding. In this embodiment, the stator coil 160 has a first winding system 160A connected to the first inverter 171A and a second winding system 160B connected to the second inverter 171B. The first system winding 160A is composed of U1, V1 and W1 phase windings, and the second system winding 160B is composed of U2, V2 and W2 phase windings. The phase windings (U1, U2, V1, V2, W1, W2 phase windings) are arranged with proper spacing from each other by the slots 133 .
　Ｕ１相巻線、Ｖ１相巻線、Ｗ１相巻線は、スター結線（Ｙ結線）により接続される。Ｕ１相巻線、Ｖ１相巻線及びＷ１相巻線は、一端側が中性点で接続され、他端側が第１インバータ１７１Ａに接続される。Ｕ２相巻線、Ｖ２相巻線、Ｗ２相巻線は、スター結線（Ｙ結線）により接続される。Ｕ２相巻線、Ｖ２相巻線及びＷ２相巻線は、一端側が中性点で接続され、他端側が第２インバータ１７１Ｂに接続される。 The U1-phase winding, V1-phase winding, and W1-phase winding are connected by star connection (Y connection). The U1-phase winding, the V1-phase winding, and the W1-phase winding are connected at one end to a neutral point, and connected at the other end to the first inverter 171A. The U2-phase winding, the V2-phase winding, and the W2-phase winding are connected by a star connection (Y connection). The U2-phase winding, the V2-phase winding, and the W2-phase winding are connected to a neutral point at one end and connected to the second inverter 171B at the other end.
　Ｕ１，Ｖ１，Ｗ１相巻線及びＵ２，Ｖ２，Ｗ２相巻線はそれぞれ６つの周回巻線で構成されている。周回巻線は、複数のセグメント導体１６５が接続されることにより、ステータコア１３１を機械的に１周する巻線である。本実施形態では、８つのセグメント導体１６５によって１つの周回巻線が形成される。例えば、第１系統巻線１６０ＡのＵ１相巻線は複数の周回巻線ｕ１２Ａ０，ｕ１２Ｂ０，ｕ３４Ａ０，ｕ３４Ｂ０，ｕ５６Ａ０，ｕ５６Ｂ０を有し、第２系統巻線１６０ＢのＵ２相巻線は周回巻線ｕ１２Ａ３０，ｕ１２Ｂ３０，ｕ３４Ａ３０，ｕ３４Ｂ３０，ｕ５６Ａ３０，ｕ５６Ｂ３０を有している。 The U1, V1, W1 phase windings and the U2, V2, W2 phase windings each consist of six winding windings. The loop winding is a winding that mechanically makes one turn around stator core 131 by connecting a plurality of segment conductors 165 . In this embodiment, eight segment conductors 165 form one winding. For example, the U1-phase winding of the first winding system 160A has a plurality of winding windings u12A0, u12B0, u34A0, u34B0, u56A0, and u56B0, and the U2-phase winding of the second winding system 160B has a winding u12A30. , u12B30, u34A30, u34B30, u56A30, u56B30.
　図６はステータコア１３１のスロット１３３内に配置される相巻線の位置を説明するための模式図である。本実施形態では、電気角３６０度にスロット１３３が１２個配置されており、例えば、図６のスロット番号「１」からスロット番号「１２」までが２極分（１磁極対分）に相当する。電気角１周期分のスロット１３３の数は、全スロット数（４８スロット）を極対数（４極対）で割ることにより求められる。なお、極対数とは、Ｎ極とＳ極のペアの個数であり、回転電機１１０の極数／２に相当する。 FIG. 6 is a schematic diagram for explaining the positions of the phase windings arranged in the slots 133 of the stator core 131. FIG. In this embodiment, 12 slots 133 are arranged at an electrical angle of 360 degrees. For example, slot number "1" to slot number "12" in FIG. 6 correspond to two poles (one magnetic pole pair). . The number of slots 133 for one period of electrical angle is obtained by dividing the total number of slots (48 slots) by the number of pole pairs (4 pole pairs). The number of pole pairs is the number of pairs of N poles and S poles, and corresponds to the number of poles of rotating electric machine 110/2.
　回転電機１１０の毎極スロット数は６であり、毎極毎相スロット数ＮＳＰＰは２（ＮＳＰＰ＝スロット数／極数／相数＝４８スロット／８極／３相＝６／３）である。各スロット１３３には、スロット内導体１６１が６本ずつ挿通されている。図中、ステータコア１３１の一方側から反対側への方向を示すクロス印「×」、その逆の方向を示す黒丸印「●」をそれぞれ記した。なお、図６では、Ｕ１相巻線を構成する周回巻線ｕ１２Ａ０，ｕ１２Ｂ０，ｕ３４Ａ０，ｕ３４Ｂ０，ｕ５６Ａ０，ｕ５６Ｂ０及びＵ２相巻線を構成する周回巻線ｕ１２Ａ３０，ｕ１２Ｂ３０，ｕ３４Ａ３０，ｕ３４Ｂ３０，ｕ５６Ａ３０，ｕ５６Ｂ３０について示し、Ｖ１相巻線、Ｖ２相巻線、Ｗ１相巻線及びＷ２相巻線を構成するコイル導体の位置については、相を表す符号Ｖ，Ｗを示す。 The number of slots per pole of the rotating electric machine 110 is 6, and the number of slots per pole per phase NSPP is 2 (NSPP = number of slots/number of poles/number of phases = 48 slots/8 poles/3 phases = 6/3). Six in-slot conductors 161 are inserted into each slot 133 . In the drawing, a cross mark "x" indicates the direction from one side of the stator core 131 to the opposite side, and a black circle mark "●" indicates the opposite direction. In FIG. 6, the circuit windings u12A0, u12B0, u34A0, u34B0, u56A0, and u56B0 that constitute the U1 phase winding and the circuit windings u12A30, u12B30, u34A30, u34B30, u56A30, and u56B30 that constitute the U2 phase winding are shown. The positions of the coil conductors forming the V1-phase winding, the V2-phase winding, the W1-phase winding, and the W2-phase winding are indicated by symbols V and W representing phases.
　回転電機１１０はスロット１３３の数が４８であるため、隣接するスロット１３３間の距離であるスロットピッチは、機械角で７．５°である。これは、空間的に電気角３０°の位相差に相当する。隣接するスロット１３３間の位相差は、３６０°を電気角１周期分のスロット１３３の数である１２で割ることで求められる。 Since the rotating electric machine 110 has 48 slots 133, the slot pitch, which is the distance between adjacent slots 133, is 7.5 degrees in mechanical angle. This spatially corresponds to a phase difference of 30 electrical degrees. The phase difference between adjacent slots 133 is obtained by dividing 360° by 12, which is the number of slots 133 for one electrical angle cycle.
　１層目Ｌ１及び２層目Ｌ２に配置される周回巻線ｕ１２Ａ０と周回巻線ｕ１２Ａ３０とは、空間的に電気角３０°の位相差を持ち、周回巻線ｕ１２Ｂ０と周回巻線ｕ１２Ｂ３０とは、空間的に電気角３０°の位相差を持つ。３層目Ｌ３及び４層目Ｌ４に配置される周回巻線ｕ３４Ａ０と周回巻線ｕ３４Ａ３０とは、空間的に電気角３０°の位相差を持ち、周回巻線ｕ３４Ｂ０と周回巻線ｕ３４Ｂ３０とは、空間的に電気角３０°の位相差を持つ。５層目Ｌ５及び６層目Ｌ６に配置される周回巻線ｕ５６Ａ０と周回巻線ｕ５６Ａ３０とは、空間的に電気角３０°の位相差を持ち、周回巻線ｕ５６Ｂ０と周回巻線ｕ５６Ｂ３０とは、空間的に電気角３０°の位相差を持つ。 The winding winding u12A0 and the winding winding u12A30 arranged in the first layer L1 and the second layer L2 have a spatial phase difference of 30 degrees in electrical angle, and the winding winding u12B0 and the winding winding u12B30 are: It has a spatial phase difference of 30 degrees in electrical angle. The winding winding u34A0 and the winding winding u34A30 arranged in the third layer L3 and the fourth layer L4 have a spatial phase difference of 30 degrees in electrical angle, and the winding winding u34B0 and the winding winding u34B30 are: It has a spatial phase difference of 30 degrees in electrical angle. The winding winding u56A0 and the winding winding u56A30 arranged in the fifth layer L5 and the sixth layer L6 have a spatial phase difference of 30 degrees in electrical angle, and the winding winding u56B0 and the winding winding u56B30 are It has a spatial phase difference of 30 degrees in electrical angle.
　このように、Ｕ１相巻線とＵ２相巻線は空間的に電気角３０°の位相差を持つように配置される。同様に、Ｖ１相巻線とＶ２相巻線は空間的に電気角３０°の位相差を持つように配置され、Ｗ１相巻線とＷ２相巻線は空間的に電気角３０°の位相差を持つように配置される。 In this way, the U1-phase winding and the U2-phase winding are arranged so as to have a spatial phase difference of 30 degrees in electrical angle. Similarly, the V1-phase winding and the V2-phase winding are arranged so as to have a spatial phase difference of 30° in electrical angle, and the W1-phase winding and the W2-phase winding are arranged to have a spatial phase difference of 30° in electrical angle. are arranged to have
　本実施形態では、第１系統巻線１６０Ａと第２系統巻線１６０Ｂが、空間的に電気角３０°の位相差を持つように、ステータコア１３１に装着されている。別の言い方をすれば、第１系統巻線１６０Ａは、基準位相と空間的に位相差０°でステータコア１３１に装着され、第２系統巻線１６０Ｂは、基準位相と空間的に位相差３０°でステータコア１３１に装着されている。ここで、基準位相とは、第１系統巻線１６０Ａが装着されるスロット１３３の位相のことを指す。第１系統巻線１６０Ａと第２系統巻線１６０Ｂの空間的な位相差ｎ°は、３６０°／（スロット１３３の数／極対数）に相当する。 In this embodiment, the first system winding 160A and the second system winding 160B are attached to the stator core 131 so as to have a spatial phase difference of 30 degrees in electrical angle. In other words, the first winding system 160A is attached to the stator core 131 with a spatial phase difference of 0° from the reference phase, and the second winding system 160B has a spatial phase difference of 30° from the reference phase. is attached to the stator core 131 at . Here, the reference phase refers to the phase of slot 133 in which first system winding 160A is mounted. The spatial phase difference n° between the first system winding 160A and the second system winding 160B corresponds to 360°/(number of slots 133/number of pole pairs).
　図５に示すように、第１系統巻線１６０ＡのＵ１相巻線において、外径側コイル１６０ｏによって形成される第１回路Ｃ１１と、内径側コイル１６０ｉａ，１６０ｉｂによって形成される第２回路Ｃ１２とは直列に接続されている。第１回路Ｃ１１は、スロット１３３の５層目Ｌ５及び６層目Ｌ６に配置される周回巻線ｕ５６Ａ０と周回巻線ｕ５６Ｂ０とが直列に接続された直列回路である。第２回路Ｃ１２は、第１の直列回路Ｃｓ１１と第２の直列回路Ｃｓ１２とが並列に接続された並列回路である。第１の直列回路Ｃｓ１１は、スロット１３３の１層目Ｌ１及び２層目Ｌ２に配置される周回巻線ｕ１２Ａ０と、スロット１３３の３層目Ｌ３及び４層目Ｌ４に配置される周回巻線ｕ３４Ａ０とが直列に接続された直列回路である。第２の直列回路Ｃｓ１２は、スロット１３３の１層目Ｌ１及び２層目Ｌ２に配置される周回巻線ｕ１２Ｂ０と、スロット１３３の３層目Ｌ３及び４層目Ｌ４に配置される周回巻線ｕ３４Ｂ０とが直列に接続された直列回路である。 As shown in FIG. 5, in the U1-phase winding of the first system winding 160A, a first circuit C11 formed by the outer diameter side coil 160o and a second circuit C12 formed by the inner diameter side coils 160ia and 160ib. are connected in series. The first circuit C11 is a series circuit in which the encircling winding u56A0 and the encircling winding u56B0 arranged in the fifth layer L5 and the sixth layer L6 of the slot 133 are connected in series. The second circuit C12 is a parallel circuit in which the first series circuit Cs11 and the second series circuit Cs12 are connected in parallel. The first series circuit Cs11 includes the circulating winding u12A0 arranged on the first layer L1 and the second layer L2 of the slot 133, and the circulating winding u34A0 arranged on the third layer L3 and the fourth layer L4 of the slot 133. is a series circuit in which and are connected in series. The second series circuit Cs12 includes the circulating winding u12B0 arranged in the first layer L1 and the second layer L2 of the slot 133, and the circulating winding u34B0 arranged in the third layer L3 and the fourth layer L4 of the slot 133. is a series circuit in which and are connected in series.
　第２系統巻線１６０ＢのＵ２相巻線において、外径側コイル１６０ｏによって形成される第１回路Ｃ２１と、内径側コイル１６０ｉａ，１６０ｉｂによって形成される第２回路Ｃ２２とは直列に接続されている。第１回路Ｃ２１は、スロット１３３の５層目Ｌ５及び６層目Ｌ６に配置される周回巻線ｕ５６Ａ３０と周回巻線ｕ５６Ｂ３０とが直列に接続された直列回路である。第２回路Ｃ２２は、第１の直列回路Ｃｓ２１と第２の直列回路Ｃｓ２２とが並列に接続された並列回路である。第１の直列回路Ｃｓ２１は、スロット１３３の１層目Ｌ１及び２層目Ｌ２に配置される周回巻線ｕ１２Ａ３０と、スロット１３３の３層目Ｌ３及び４層目Ｌ４に配置される周回巻線ｕ３４Ａ３０とが直列に接続された直列回路である。第２の直列回路Ｃｓ２２は、スロット１３３の１層目Ｌ１及び２層目Ｌ２に配置される周回巻線ｕ１２Ｂ３０と、スロット１３３の３層目Ｌ３及び４層目Ｌ４に配置される周回巻線ｕ３４Ｂ３０とが直列に接続された直列回路である。なお、Ｖ相巻線及びＷ相巻線における回路構成は、Ｕ相巻線の回路構成と同様であるので、説明を省略する。 In the U2-phase winding of the second system winding 160B, the first circuit C21 formed by the outer coil 160o and the second circuit C22 formed by the inner coils 160ia and 160ib are connected in series. . The first circuit C21 is a series circuit in which the encircling winding u56A30 and the encircling winding u56B30 arranged in the fifth layer L5 and the sixth layer L6 of the slot 133 are connected in series. The second circuit C22 is a parallel circuit in which the first series circuit Cs21 and the second series circuit Cs22 are connected in parallel. The first series circuit Cs21 includes the circulating winding u12A30 arranged on the first layer L1 and the second layer L2 of the slot 133, and the circulating winding u34A30 arranged on the third layer L3 and the fourth layer L4 of the slot 133. is a series circuit in which and are connected in series. The second series circuit Cs22 includes the circulating winding u12B30 arranged on the first layer L1 and the second layer L2 of the slot 133, and the circulating winding u34B30 arranged on the third layer L3 and the fourth layer L4 of the slot 133. is a series circuit in which and are connected in series. The circuit configurations of the V-phase winding and the W-phase winding are the same as the circuit configuration of the U-phase winding, so description thereof will be omitted.
　Ｕ１相巻線の第１の直列回路Ｃｓ１１を構成する１層目Ｌ１及び２層目Ｌ２に配置される周回巻線の数と、第２の直列回路Ｃｓ１２を構成する１層目Ｌ１及び２層目Ｌ２に配置される周回巻線の数は一致する。また、Ｕ１相巻線の第１の直列回路Ｃｓ１１を構成する３層目Ｌ３及び４層目Ｌ４に配置される周回巻線の数と、第２の直列回路Ｃｓ１２を構成する３層目Ｌ３及び４層目Ｌ４に配置される周回巻線の数は一致する。 The number of winding windings arranged in the first layer L1 and the second layer L2 that constitute the first series circuit Cs11 of the U1-phase winding, and the first layer L1 and the second layer that constitute the second series circuit Cs12 The number of winding windings arranged in the eye L2 is the same. Also, the number of winding windings arranged in the third layer L3 and the fourth layer L4 that constitute the first series circuit Cs11 of the U1-phase winding, and the third layer L3 and L3 that constitute the second series circuit Cs12 The number of winding windings arranged in the fourth layer L4 is the same.
　同様に、Ｕ２相巻線の第１の直列回路Ｃｓ２１を構成する１層目Ｌ１及び２層目Ｌ２に配置される周回巻線の数と、第２の直列回路Ｃｓ２２を構成する１層目Ｌ１及び２層目Ｌ２に配置される周回巻線の数は一致する。また、Ｕ２相巻線の第１の直列回路Ｃｓ２１を構成する３層目Ｌ３及び４層目Ｌ４に配置される周回巻線の数と、第２の直列回路Ｃｓ２２を構成する３層目Ｌ３及び４層目Ｌ４に配置される周回巻線の数は一致する。 Similarly, the number of circling windings arranged in the first layer L1 and the second layer L2 forming the first series circuit Cs21 of the U2-phase winding and the number of the first layer L1 forming the second series circuit Cs22 and the number of winding windings arranged in the second layer L2 are the same. Also, the number of winding windings arranged in the third layer L3 and the fourth layer L4 that constitute the first series circuit Cs21 of the U2-phase winding, the third layer L3 that constitutes the second series circuit Cs22 and The number of winding windings arranged in the fourth layer L4 is the same.
　このように、本実施形態では、スロット１３３の内周側から外周側に向かって順に１層目、２層目、・・・、ｍ層目、ｍ＋１層目とした場合、第１の直列回路Ｃｓ１１を構成するｓ，ｓ＋１層目（ｓは、１～ｍまでの奇数）に配置される周回巻線の数と、第２の直列回路Ｃｓ１２を構成するｓ，ｓ＋１層目に配置される周回巻線の数が同じである。なお、Ｕ１相巻線を構成する周回巻線は、Ｕ字状のセグメント導体１６５が２つ接続されることにより形成される波状コイルが、４つ接続されることにより形成される。このため、第１の直列回路Ｃｓ１１を構成するｓ，ｓ＋１層目に配置される波状コイルの数と、第２の直列回路Ｃｓ１２を構成するｓ，ｓ＋１層目に配置される波状コイルの数とが一致しているともいえる。これにより、並列回路である第２回路Ｃ１２に循環電流が発生することを防止できる。 Thus, in the present embodiment, when the first layer, the second layer, . The number of winding windings arranged in the s, s+1-th layers (s is an odd number from 1 to m) constituting Cs11, and the number of windings arranged in the s, s+1-th layers constituting the second series circuit Cs12 The number of windings is the same. The round winding that constitutes the U1-phase winding is formed by connecting four wavy coils that are formed by connecting two U-shaped segment conductors 165 . Therefore, the number of wavy coils arranged on the s, s+1-th layers constituting the first series circuit Cs11 and the number of wavy coils arranged on the s, s+1-th layers constituting the second series circuit Cs12 are can be said to match. Thereby, it is possible to prevent a circulating current from being generated in the second circuit C12, which is a parallel circuit.
　同様に、第１の直列回路Ｃｓ２１を構成するｓ，ｓ＋１層目（ｓは、１～ｍまでの奇数）に配置される周回巻線の数と、第２の直列回路Ｃｓ２２を構成するｓ，ｓ＋１層目に配置される周回巻線の数が同じである。なお、Ｕ２相巻線を構成する周回巻線は、Ｕ字状のセグメント導体１６５が２つ接続されることにより形成される波状コイルが、４つ接続されることにより形成される。このため、第１の直列回路Ｃｓ２１を構成するｓ，ｓ＋１層目に配置される波状コイルの数と、第２の直列回路Ｃｓ２２を構成するｓ，ｓ＋１層目に配置される波状コイルの数とが一致しているともいえる。これにより、並列回路である第２回路Ｃ２２に循環電流が発生することを防止できる。さらに、Ｕ１相及びＵ２相と同様の回路構成であるＶ１相、Ｖ２相、Ｗ１相及びＷ２相における並列回路（第２回路）においても、循環電流が発生することを防止できる。 Similarly, the number of winding windings arranged in the s, s+1-th layer (s is an odd number from 1 to m) constituting the first series circuit Cs21, and the number of windings s, constituting the second series circuit Cs22 The number of winding windings arranged on the s+1-th layer is the same. The round winding that constitutes the U2-phase winding is formed by connecting four wavy coils formed by connecting two U-shaped segment conductors 165 . Therefore, the number of wavy coils arranged on the s, s+1-th layers constituting the first series circuit Cs21 and the number of wavy coils arranged on the s, s+1-th layers constituting the second series circuit Cs22 are can be said to match. Thereby, it is possible to prevent a circulating current from being generated in the second circuit C22, which is a parallel circuit. Furthermore, in a parallel circuit (second circuit) of the V1, V2, W1 and W2 phases, which have the same circuit configuration as the U1 and U2 phases, the occurrence of circulating current can be prevented.
　図７を参照して、第１回路Ｃ１１，Ｃ２１と第２回路Ｃ１２，Ｃ２２の接続構造について説明する。Ｕ１相巻線の第１回路Ｃ１１と第２回路Ｃ１２の接続構造と、Ｕ２相巻線の第１回路Ｃ２１と第２回路Ｃ２２の接続構造は同様であるので、Ｕ１相巻線の第１回路Ｃ１１と第２回路Ｃ１２の接続構造を代表して説明する。 A connection structure between the first circuits C11, C21 and the second circuits C12, C22 will be described with reference to FIG. Since the connection structure between the first circuit C11 and the second circuit C12 of the U1 phase winding and the connection structure of the first circuit C21 and the second circuit C22 of the U2 phase winding are the same, the first circuit of the U1 phase winding The connection structure between C11 and the second circuit C12 will be described as a representative.
　図７に示すように、第１回路Ｃ１１と第２回路Ｃ１２とは、スロット１３３の外側において、接続用導体１６８によって接続される。接続用導体１６８は、例えば、矩形平板状の銅板により形成され、溶接等により第１回路Ｃ１１の引出し線と第２回路Ｃ１２の引出し線とに接続される。 As shown in FIG. 7, the first circuit C11 and the second circuit C12 are connected by a connection conductor 168 outside the slot 133. The connection conductor 168 is formed of, for example, a rectangular copper plate, and is connected to the lead wire of the first circuit C11 and the lead wire of the second circuit C12 by welding or the like.
　上述したように、第１回路Ｃ１１のコイル導体の厚み（コイル高さＨｏ）と、第２回路Ｃ１２のコイル導体の厚み（コイル高さＨｉ）とは異なる（図３参照）。厚みの異なるコイル導体を突き合わせ等で直接溶接する場合、溶接作業が難しい。 As described above, the thickness of the coil conductor of the first circuit C11 (coil height Ho) is different from the thickness of the coil conductor of the second circuit C12 (coil height Hi) (see FIG. 3). It is difficult to weld coil conductors of different thicknesses directly by butt welding.
　これに対して、本実施形態では、接続用導体１６８を第１回路Ｃ１１の引出し線の側面と第２回路Ｃ１２の引出し線の側面のそれぞれに溶接する。つまり、接続用導体１６８と第１回路Ｃ１１とが溶接部を介して接続されるとともに、接続用導体１６８と第２回路Ｃ１２とが溶接部を介して接続される。第１回路Ｃ１１と第２回路Ｃ１２を直接接続するのではなく接続用導体１６８を介して接続することにより、第１回路Ｃ１１と第２回路Ｃ１２とを容易に接続することができる。このため、回転電機１１０の製造コストを低減することができる。なお、接続用導体１６８は、銅板に限らず、リード線などの導電部材であってもよい。 On the other hand, in the present embodiment, the connection conductor 168 is welded to each of the side surface of the lead wire of the first circuit C11 and the side surface of the lead wire of the second circuit C12. That is, the connection conductor 168 and the first circuit C11 are connected via the weld, and the connection conductor 168 and the second circuit C12 are connected via the weld. The first circuit C11 and the second circuit C12 can be easily connected by connecting the first circuit C11 and the second circuit C12 through the connection conductor 168 instead of connecting them directly. Therefore, the manufacturing cost of rotating electric machine 110 can be reduced. The connection conductor 168 is not limited to a copper plate, and may be a conductive member such as a lead wire.
　図８を参照して、Ｕ１相巻線及びＵ２相巻線に発生する誘起電圧について説明する。誘起電圧は、コイルに鎖交する磁束に起因して発生する。上述したように、第１系統巻線１６０Ａと第２系統巻線１６０Ｂとが、空間的な位相差ｎ°（＝３０°）を有している。このため、駆動装置１７０は、第１系統巻線１６０Ａ及び第２系統巻線１６０Ｂに対し、時間的にｎ°（＝３０°）の位相差で電圧を印加する。 The induced voltages generated in the U1-phase winding and the U2-phase winding will be described with reference to FIG. The induced voltage is generated due to the magnetic flux interlinking the coil. As described above, the first system winding 160A and the second system winding 160B have a spatial phase difference n° (=30°). Therefore, the driving device 170 applies voltages with a temporal phase difference of n° (=30°) to the first winding system 160A and the second winding system 160B.
　図８に示すように、周回巻線ｕ１２Ａ０，ｕ１２Ｂ０には、基準位相と空間的に位相が一致する誘起電圧Ｖｕ１２∠０°が発生し、周回巻線ｕ３４Ａ０，ｕ３４Ｂ０には、基準位相と空間的に位相が一致する誘起電圧Ｖｕ３４∠０°が発生し、周回巻線ｕ５６Ａ０，ｕ５６Ｂ０には、基準位相と空間的に位相が一致する誘起電圧Ｖｕ５６∠０°が発生する。また、周回巻線ｕ１２Ａ３０，ｕ１２Ｂ３０には、基準位相と空間的にｎ°（＝３０°）の位相差を持つ誘起電圧Ｖｕ１２∠３０°が発生し、周回巻線ｕ３４Ａ０，ｕ３４Ｂ０には、基準位相と空間的にｎ°（＝３０°）の位相差を持つ誘起電圧Ｖｕ３４∠３０°が発生し、周回巻線ｕ５６Ａ０，ｕ５６Ｂ０には、基準位相と空間的にｎ°（＝３０°）の位相差を持つ誘起電圧Ｖｕ５６∠３０°が発生する。なお、Ｖ１相巻線、Ｖ２相巻線、Ｗ１相巻線及びＷ２相巻線を構成する周回巻線にも同様の誘起電圧が発生する。 As shown in FIG. 8, induced voltages Vu12∠0° spatially in phase with the reference phase are generated in the loop windings u12A0 and u12B0, and in the loop windings u34A0 and u34B0, the reference phase An induced voltage Vu34∠0° whose phase matches the reference phase is generated in the winding windings u56A0 and u56B0. In addition, an induced voltage Vu12∠30° having a spatial phase difference of n° (=30°) from the reference phase is generated in the circulation windings u12A30 and u12B30, and the reference phase and an induced voltage Vu34∠30° having a phase difference of n° (=30°) spatially is generated, and the winding windings u56A0 and u56B0 have a reference phase and a spatial position of n° (=30°) An induced voltage Vu56∠30° having a phase difference is generated. A similar induced voltage is also generated in the winding windings that constitute the V1-phase winding, the V2-phase winding, the W1-phase winding, and the W2-phase winding.
　上述したように、駆動装置１７０は、空間的に位相差０°の第１系統巻線１６０Ａに時間的に位相差０°の電圧を印可し、空間的に位相差ｎ°の第２系統巻線１６０Ｂに時間的に位相差ｎ°の電圧を印可する。このため、第１系統巻線１６０Ａにより形成される回路と、第２系統巻線１６０Ｂにより形成される回路とは、電圧がバランスすることになるので、循環電流の発生を防ぐことができる。 As described above, the drive device 170 applies a voltage with a temporal phase difference of 0° to the first system winding 160A with a spatial phase difference of 0°, and applies a voltage with a temporal phase difference of 0° to the second system winding with a spatial phase difference of n°. A voltage with a temporal phase difference of n° is applied to the line 160B. Therefore, the circuit formed by the first system winding 160A and the circuit formed by the second system winding 160B are balanced in voltage, so that the generation of circulating current can be prevented.
　本実施形態では、第１インバータ１７１Ａに接続された回路に対して、第２インバータ１７１Ｂに接続された回路は、空間的に３０°進み、時間的に３０°進んでいる。時間的な３０°の進みは、空間的には３０°遅れることに等価となるため、３０°－３０°＝０°となる。よって、第１インバータ１７１Ａに接続された回路と第２インバータ１７１Ｂに接続された回路の電圧がバランスする。 In this embodiment, the circuit connected to the second inverter 171B is spatially 30° and temporally 30° ahead of the circuit connected to the first inverter 171A. A temporal advance of 30° is equivalent to a spatial delay of 30°, so 30°−30°=0°. Therefore, the voltages of the circuit connected to the first inverter 171A and the voltage of the circuit connected to the second inverter 171B are balanced.
　以上のように構成される本実施形態に係る電動駆動システム１０によって得られる効果について、以下で説明する参考例と比較しながら説明する。本実施形態では、ステータコア１３１の外周側に配置された外径側コイル１６０ｏのコイル高さＨｏ（厚み）に比べて、ステータコア１３１の内周側に配置された内径側コイル１６０ｉａ，１６０ｉｂのコイル高さＨｉ（厚み）が小さい。この構成により、交流銅損を低減することができる。 The effects obtained by the electric drive system 10 according to this embodiment configured as described above will be described in comparison with the reference example described below. In this embodiment, compared with the coil height Ho (thickness) of the outer coil 160o arranged on the outer peripheral side of the stator core 131, the coil heights of the inner coils 160ia and 160ib arranged on the inner peripheral side of the stator core 131 Thickness Hi (thickness) is small. With this configuration, AC copper loss can be reduced.
　図９は、同じ厚みのスロット内導体１６１を有する回路と、異なる厚みのスロット内導体１６１を有する回路との構成及び効果の違いについて説明する図である。図９の上側に示す回路（以下、第１参考回路Ｃｒ１と記す）は、２つの系統巻線が並列に接続された構成であり、ステータコア１３１に厚みｔのスロット内導体１６１が４つ配置されている。この構成では、１層目Ｌ１及び２層目Ｌ２において大きな交流銅損が発生する。交流銅損は、内径側に配置されるコイル導体ほど大きくなる。 FIG. 9 is a diagram for explaining the difference in configuration and effect between a circuit having in-slot conductors 161 with the same thickness and a circuit having in-slot conductors 161 with different thicknesses. The circuit shown on the upper side of FIG. 9 (hereinafter referred to as a first reference circuit Cr1) has a configuration in which two system windings are connected in parallel, and four in-slot conductors 161 having a thickness t are arranged in a stator core 131. ing. In this configuration, a large AC copper loss occurs in the first layer L1 and the second layer L2. The AC copper loss increases as the coil conductor is arranged on the inner diameter side.
　これに対して、図９の下側に示す回路（以下、第２参考回路Ｃｒ２と記す）は、２つの系統巻線が並列に接続された構成であり、厚みｔのスロット内導体１６１が２つ、厚みｔ／２のスロット内導体１６１が４つ配置されている。スロット内導体１６１の厚みを半分にする場合、交流銅損は、（１／２）４＝１／１６となる。内径側に配置されるスロット内導体１６１の厚みを半分にすることで、第１参考回路Ｃｒ１に比べて、交流銅損を大きく低減することができる。 On the other hand, the circuit shown on the lower side of FIG. , and four in-slot conductors 161 having a thickness of t/2 are arranged. When the thickness of the in-slot conductor 161 is halved, the AC copper loss is (1/2) 4 =1/16. By halving the thickness of the in-slot conductor 161 arranged on the inner diameter side, the AC copper loss can be greatly reduced compared to the first reference circuit Cr1.
　なお、第２参考回路Ｃｒ２では、スロット内導体１６１の本数の増加により、スロット１３３内におけるコイル導体の絶縁被膜の総断面積が増加する。したがって、第２参考回路Ｃｒ２では、絶縁被膜の断面積の増加分だけ、導体の断面積が減少する。その結果、コイル導体の電気抵抗が増加するため、直流銅損が増加する。しかしながら、交流銅損の低減量に比べて直流銅損の増加量は小さい。このため、第２参考回路Ｃｒ２では、第１参考回路Ｃｒ１に比べて、全銅損を低減することができる。また、各コイル導体の銅損を平準化することができる。スロット内導体１６１の温度も平準化されるため、ステータコイル１６０のピーク温度も低減することができる。本実施形態においても、内径側コイル１６０ｉａ，１６０ｉｂのスロット内導体１６１の厚みが、外径側コイル１６０ｏのスロット内導体１６１の厚みの半分とされているため（図３参照）、同様の効果が得られる。 In addition, in the second reference circuit Cr2, the total cross-sectional area of the insulating coating of the coil conductors in the slot 133 increases as the number of the in-slot conductors 161 increases. Therefore, in the second reference circuit Cr2, the cross-sectional area of the conductor decreases by the increase in the cross-sectional area of the insulating coating. As a result, the electrical resistance of the coil conductor increases, which increases DC copper loss. However, the amount of increase in DC copper loss is smaller than the amount of reduction in AC copper loss. Therefore, the total copper loss can be reduced in the second reference circuit Cr2 as compared with the first reference circuit Cr1. Moreover, the copper loss of each coil conductor can be leveled. Since the temperature of the in-slot conductor 161 is also leveled, the peak temperature of the stator coil 160 can also be reduced. Also in the present embodiment, the thickness of the in-slot conductors 161 of the inner coils 160ia and 160ib is half the thickness of the in-slot conductors 161 of the outer coil 160o (see FIG. 3). can get.
　第１参考回路Ｃｒ１は、２Ｙ結線とされ、電源の電流４００Ａに対して各相巻線に通電される電流は１／２の２００Ａとなる。一方、第２参考回路Ｃｒ２では、内径側のスロット内導体１６１の厚みがｔ／２である。したがって、内径側コイル１６０ｉａ，１６０ｉｂにより形成される周回巻線の電流密度を、外径側コイル１６０ｏと同等とするためには、内径側コイル１６０ｉａ，１６０ｉｂに流れる電流を１／４の１００Ａにする必要がある。このため、第２参考回路Ｃｒ２では、内径側コイル１６０ｉａ，１６０ｉｂにより形成される回路Ｃｉが、並列に接続されることで並列回路Ｃｐが形成されている。 The first reference circuit Cr1 has a 2Y connection, and the current supplied to each phase winding is 200A, which is half of the current 400A of the power supply. On the other hand, in the second reference circuit Cr2, the thickness of the in-slot conductor 161 on the inner diameter side is t/2. Therefore, in order to make the current density of the winding formed by the inner diameter side coils 160ia and 160ib equivalent to that of the outer diameter side coil 160o, the current flowing through the inner diameter side coils 160ia and 160ib is reduced to 100 A, which is 1/4. There is a need. Therefore, in the second reference circuit Cr2, the parallel circuit Cp is formed by connecting the circuits Ci formed by the inner diameter side coils 160ia and 160ib in parallel.
　第２参考回路Ｃｒ２では、各並列回路Ｃｐにおいてコイル導体の誘起電圧がバランスしない場合に循環電流が発生する。図１０を参照して、循環電流が発生する並列回路Ｃｐ３と、循環電流の発生が防止された並列回路Ｃｐ４について説明する。図１０の上側に示す回路（以下、第３参考回路Ｃｒ３と記す）は、第２参考回路Ｃｒ２と同様の構成を有する。第３参考回路Ｃｒ３は、１層目Ｌ１及び２層目Ｌ２に配置される複数の周回巻線Ｃｗ１２が直列に接続された直列回路と、３層目Ｌ３及び４層目Ｌ４に配置される複数の周回巻線Ｃｗ３４が直列に接続された直列回路とが並列に接続された並列回路Ｃｐ３を有する。 In the second reference circuit Cr2, a circulating current is generated when the induced voltages of the coil conductors are not balanced in each parallel circuit Cp. A parallel circuit Cp3 in which a circulating current is generated and a parallel circuit Cp4 in which the generation of a circulating current is prevented will be described with reference to FIG. The circuit shown on the upper side of FIG. 10 (hereinafter referred to as the third reference circuit Cr3) has the same configuration as the second reference circuit Cr2. The third reference circuit Cr3 includes a series circuit in which a plurality of circular windings Cw12 arranged on the first layer L1 and the second layer L2 are connected in series, and a plurality of windings arranged on the third layer L3 and the fourth layer L4. A parallel circuit Cp3 is connected in parallel with a series circuit in which the winding windings Cw34 of are connected in series.
　スロット１３３が平行スロットである場合、ティース１３４はコアバック１３５から回転中心軸Ｃａに向かうにつれて周方向の幅が短くなる先細り形状となっている。ティース１３４の周方向の幅が異なることで磁気飽和が異なる。ティース１３４の周方向の幅が大きいほど、磁束が通りやすくなるため誘起電圧が大きくなる。つまり、１層目Ｌ１及び２層目Ｌ２に配置される周回巻線に発生する誘起電圧Ｖｕ１２、３層目Ｌ３及び４層目Ｌ４に配置される周回巻線に発生する誘起電圧Ｖｕ３４、並びに、５層目Ｌ５及び６層目Ｌ６に配置される周回巻線に発生する誘起電圧Ｖｕ５６の大小関係は、Ｖｕ５６＞Ｖｕ３４＞Ｖｕ１２となる。このため、第３参考回路Ｃｒ３では、並列回路Ｃｐ３において、電圧のアンバランスが生じ、循環電流が発生する。 When the slots 133 are parallel slots, the teeth 134 have a tapered shape in which the width in the circumferential direction decreases from the core back 135 toward the rotation center axis Ca. The magnetic saturation is different because the teeth 134 have different widths in the circumferential direction. As the width of the teeth 134 in the circumferential direction increases, the magnetic flux is easier to pass through and the induced voltage increases. That is, the induced voltage Vu12 generated in the windings arranged in the first layer L1 and the second layer L2, the induced voltage Vu34 generated in the windings arranged in the third layer L3 and the fourth layer L4, and The magnitude relationship of the induced voltage Vu56 generated in the loop windings arranged in the fifth layer L5 and the sixth layer L6 is Vu56>Vu34>Vu12. Therefore, in the third reference circuit Cr3, a voltage imbalance occurs in the parallel circuit Cp3, and a circulating current is generated.
　図１０の下側に示す回路（以下、第４参考回路Ｃｒ４と記す）は、第２参考回路Ｃｒ２と同様の構成を有する。第４参考回路Ｃｒ４は、１層目Ｌ１及び２層目Ｌ２に配置される周回巻線Ｃｗ１２と３層目Ｌ３及び４層目Ｌ４に配置される周回巻線Ｃｗ３４が直列に接続された直列回路同士が、並列に接続された並列回路Ｃｐ４を有する。 The circuit shown on the lower side of FIG. 10 (hereinafter referred to as the fourth reference circuit Cr4) has the same configuration as the second reference circuit Cr2. The fourth reference circuit Cr4 is a series circuit in which the circular windings Cw12 arranged on the first layer L1 and the second layer L2 and the circular windings Cw34 arranged on the third layer L3 and the fourth layer L4 are connected in series. have a parallel circuit Cp4 connected in parallel.
　以下、Ｕ１相巻線により形成される並列回路Ｃｐ４の構成を代表して説明する。第４参考回路Ｃｒ４では、並列回路Ｃｐ４を構成する一方の直列回路の１層目Ｌ１及び２層目Ｌ２に配置される周回巻線Ｃｗ１２の数と、並列回路Ｃｐ４を構成する他方の直列回路の１層目Ｌ１及び２層目Ｌ２に配置される周回巻線Ｃｗ１２の数とが同じである。また、第４参考回路Ｃｒ４では、並列回路Ｃｐ４を構成する一方の直列回路の３層目Ｌ３及び４層目Ｌ４に配置される周回巻線Ｃｗ３４の数と、並列回路Ｃｐ４を構成する他方の直列回路の３層目Ｌ３及び４層目Ｌ４に配置される周回巻線Ｃｗ３４の数とが同じである。なお、Ｕ２相巻線、Ｖ１相巻線、Ｖ２相巻線、Ｗ１相巻線及びＷ２相巻線の回路構成は、Ｕ１相巻線と同様の回路構成である。したがって、第４参考回路Ｃｒ４では、内径側コイル１６０ｉａ，１６０ｉｂにより形成された並列回路Ｃｐ４での電圧がバランスするため、循環電流の発生が防止される。本実施形態に係る第２回路Ｃ１２，Ｃ２２（図５参照）は、第４参考回路Ｃｒ４の並列回路Ｃｐ４と同様の構成であるため、同様の効果が得られる。 The configuration of the parallel circuit Cp4 formed by the U1-phase winding will be described below as a representative. In the fourth reference circuit Cr4, the number of winding windings Cw12 arranged in the first layer L1 and the second layer L2 of one of the series circuits constituting the parallel circuit Cp4 and the number of the other series circuit constituting the parallel circuit Cp4 are The number of winding windings Cw12 arranged in the first layer L1 and the second layer L2 is the same. Further, in the fourth reference circuit Cr4, the number of winding windings Cw34 arranged in the third layer L3 and the fourth layer L4 of one of the series circuits constituting the parallel circuit Cp4 and the number of the winding windings Cw34 arranged in the other series circuit constituting the parallel circuit Cp4 The number of winding windings Cw34 arranged on the third layer L3 and the fourth layer L4 of the circuit is the same. The circuit configurations of the U2-phase winding, the V1-phase winding, the V2-phase winding, the W1-phase winding, and the W2-phase winding are similar to that of the U1-phase winding. Therefore, in the fourth reference circuit Cr4, the voltage in the parallel circuit Cp4 formed by the inner diameter side coils 160ia and 160ib is balanced, thereby preventing the generation of circulating current. Since the second circuits C12 and C22 (see FIG. 5) according to the present embodiment have the same configuration as the parallel circuit Cp4 of the fourth reference circuit Cr4, similar effects can be obtained.
　図１１を参照して、第１系統巻線と第２系統巻線との間で循環電流が発生する回路と、第１系統巻線と第２系統巻線との間で循環電流の発生が防止された回路について説明する。図１１の上側に示す第４参考回路Ｃｒ４では、空間位相０°の第１系統巻線１６０Ａｃによる回路と、空間位相３０°の第２系統巻線１６０Ｂｃによる回路とが並列に接続された並列回路が形成されている。このため、第１系統巻線１６０Ａｃによる回路と第２系統巻線１６０Ｂｃによる回路との間に電圧のアンバランスが発生し、循環電流が発生する。 Referring to FIG. 11, a circuit in which a circulating current is generated between the first system winding and the second system winding, and a circuit in which a circulating current is generated between the first system winding and the second system winding. Prevented circuits are described. In the fourth reference circuit Cr4 shown on the upper side of FIG. 11, a parallel circuit in which a circuit of the first system winding 160Ac with a spatial phase of 0° and a circuit of the second system winding 160Bc with a spatial phase of 30° are connected in parallel. is formed. Therefore, a voltage imbalance occurs between the circuit formed by the first system winding 160Ac and the circuit formed by the second system winding 160Bc, and a circulating current is generated.
　これに対して、図１１の下側に示す本実施形態に係る回路では、空間位相０°の第１系統巻線１６０Ａによる回路と、空間位相３０°の第２系統巻線１６０Ｂによる回路とが独立しており、それぞれが異なるインバータに接続されている。また、空間位相３０°の第２系統巻線１６０Ｂに通電する電源電圧に時間的に３０°の位相差が与えられる。これにより、本実施形態では、第１系統巻線１６０Ａによる回路と第２系統巻線１６０Ｂによる回路の電圧がバランスするため、循環電流の発生を防止することができる。つまり、第１系統巻線１６０Ａによる回路と第２系統巻線１６０Ｂによる回路との間に電流差が生じることを防止できる。 On the other hand, in the circuit according to the present embodiment shown on the lower side of FIG. 11, the circuit by the first system winding 160A with a spatial phase of 0° and the circuit by the second system winding 160B with a spatial phase of 30° are provided. Independent and each connected to a different inverter. In addition, a temporal phase difference of 30° is given to the power supply voltage applied to the second system winding 160B having a spatial phase of 30°. As a result, in the present embodiment, the voltages of the circuit formed by the first system winding 160A and the voltage of the circuit formed by the second system winding 160B are balanced, so that the occurrence of circulating current can be prevented. That is, it is possible to prevent a current difference from occurring between the circuit formed by the first system winding 160A and the circuit formed by the second system winding 160B.
　上述した実施形態によれば、次の作用効果を奏する。 According to the above-described embodiment, the following effects are obtained.
　（１）電動駆動システム１０は、回転電機１１０と、回転電機１１０に電力を供給する駆動装置１７０とを備える。回転電機１１０は、ステータ１３０と、ステータ１３０の内周側に回転可能に配置されるロータ１５０とを有する。ステータ１３０は、平角線からなるステータコイル１６０と、ステータコイル１６０が配置される複数のスロット１３３を有するステータコア１３１と、を有している。ステータコイル１６０は、ステータコア１３１に波巻きで装着される複数の系統巻線を有している。複数の系統巻線は、基準位相と空間的に位相差０°でステータコア１３１に装着される第１系統巻線１６０Ａと、基準位相と空間的に位相差ｎ°でステータコア１３１に装着される第２系統巻線１６０Ｂとを有している。ｎ°は、３６０°／（スロット１３３の数／極対数）である。第１系統巻線１６０Ａ及び第２系統巻線１６０Ｂは、それぞれ、ステータコア１３１の外径側のコイル導体により形成される第１回路Ｃ１１，Ｃ２１と、ステータコア１３１の内径側のコイル導体により形成される並列回路である第２回路Ｃ１２，Ｃ２２とが直列に接続されている。内径側のコイル導体（内径側コイル１６０ｉａ，１６０ｉｂのスロット内導体１６１）は、外径側のコイル導体（外径側コイル１６０ｏのスロット内導体１６１）よりも厚み（コイル高さ）が小さい。駆動装置１７０は、第１系統巻線１６０Ａに接続される第１インバータ１７１Ａと、第２系統巻線１６０Ｂに接続される第２インバータ１７２とを有している。駆動装置１７０は、第１系統巻線１６０Ａ及び第２系統巻線１６０Ｂに対し、時間的にｎ°の位相差で電圧を印加する。 (1) The electric drive system 10 includes a rotating electrical machine 110 and a driving device 170 that supplies electric power to the rotating electrical machine 110 . Rotating electric machine 110 has a stator 130 and a rotor 150 rotatably arranged on the inner peripheral side of stator 130 . The stator 130 has a stator coil 160 made of a rectangular wire and a stator core 131 having a plurality of slots 133 in which the stator coils 160 are arranged. The stator coil 160 has a plurality of system windings mounted on the stator core 131 by wave winding. The plurality of system windings include a first system winding 160A attached to stator core 131 with a spatial phase difference of 0° from the reference phase, and a second system winding 160A attached to stator core 131 with a spatial phase difference of n° from the reference phase. 2-system winding 160B. n° is 360°/(number of slots 133/number of pole pairs). The first winding system 160A and the second winding system 160B are respectively formed by the first circuits C11 and C21 formed by the coil conductors on the outer diameter side of the stator core 131 and by the coil conductors on the inner diameter side of the stator core 131. The second circuits C12 and C22, which are parallel circuits, are connected in series. The coil conductors on the inner diameter side (in-slot conductors 161 of inner diameter side coils 160ia and 160ib) are thinner (coil height) than the coil conductors on the outer diameter side (in-slot conductors 161 of outer diameter side coil 160o). The driving device 170 has a first inverter 171A connected to the first system winding 160A and a second inverter 172 connected to the second system winding 160B. The driving device 170 applies voltages to the first system winding 160A and the second system winding 160B with a temporal phase difference of n°.
　この構成によれば、交流銅損を低減し、かつ循環電流の発生を防止することにより、高効率の電動駆動システム１０を提供することができる。 According to this configuration, it is possible to provide a highly efficient electric drive system 10 by reducing AC copper loss and preventing the generation of circulating current.
　（２）系統巻線１６０Ａ，１６０Ｂは、複数の周回巻線を有している。スロット１３３には、複数のコイル導体が径方向に層状に配置されている。第２回路Ｃ１２，Ｃ２２は、複数の周回巻線が直列に接続された第１の直列回路Ｃｓ１１，Ｃｓ２１と、複数の周回巻線が直列に接続された第２の直列回路Ｃｓ１２，Ｃｓ２２とが並列に接続されている。スロット１３３の内周側から外周側に向かって順に１層目、２層目、・・・、ｍ層目、ｍ＋１層目とした場合（本実施形態において、ｍ＝５）、第１の直列回路Ｃｓ１１，Ｃｓ２１を構成するｓ，ｓ＋１層目（ｓは、１～ｍまでの奇数）に配置される周回巻線の数と、第２の直列回路Ｃｓ１２，Ｃｓ２２を構成するｓ，ｓ＋１層目に配置される周回巻線の数は一致する。 (2) System windings 160A and 160B have a plurality of winding windings. A plurality of coil conductors are radially arranged in layers in the slot 133 . The second circuits C12 and C22 include first series circuits Cs11 and Cs21 in which a plurality of winding windings are connected in series and second series circuits Cs12 and Cs22 in which a plurality of winding windings are connected in series. connected in parallel. When the first layer, second layer, . The number of winding windings arranged in the s, s+1-th layers (s is an odd number from 1 to m) constituting the circuits Cs11, Cs21, and the s, s+1-th layers constituting the second series circuits Cs12, Cs22 The number of round windings arranged in .
　この構成によれば、第１の直列回路Ｃｓ１１，Ｃｓ２１と第２の直列回路Ｃｓ１２，Ｃｓ２２とにより形成される並列回路である第２回路Ｃ１２，Ｃ２２において、循環電流が発生することを防止することができる。 According to this configuration, it is possible to prevent a circulating current from being generated in the second circuits C12 and C22, which are parallel circuits formed by the first series circuits Cs11 and Cs21 and the second series circuits Cs12 and Cs22. can be done.
　次のような変形例も本発明の範囲内であり、変形例に示す構成と上述の実施形態で説明した構成を組み合わせたり、以下の異なる変形例で説明する構成同士を組み合わせたりすることも可能である。 The following modifications are also within the scope of the present invention, and it is also possible to combine the configurations shown in the modifications with the configurations described in the above embodiments, or to combine the configurations described in the following different modifications. is.
　＜変形例１＞
　ステータコア１３１のスロット１３３へのステータコイル１６０の配置構成は、上記実施形態に限定されない。 <Modification 1>
The arrangement configuration of stator coils 160 in slots 133 of stator core 131 is not limited to the above embodiment.
　＜変形例１－１＞
　例えば、図１２に示すように、隣接するスロット１３３の一方（スロット番号「１」のスロット）にＵ１相巻線のコイル導体を６本配置し、隣接するスロット１３３の他方（スロット番号「２」のスロット）にＵ２相巻線のコイル導体を６本配置してもよい。この場合、Ｖ相巻線及びＷ相巻線においても同様に、同じスロット１３３に同相のコイル導体が６本配置される。つまり、本変形例では、第１回路Ｃ１１，Ｃ２１を構成するステータコイル１６０（外径側コイル１６０ｏ）の磁束中心軸と、第２回路Ｃ１２，Ｃ２２を構成するステータコイル１６０の磁束中心軸とが一致している。 <Modification 1-1>
For example, as shown in FIG. 12, six coil conductors of the U1 phase winding are arranged in one of the adjacent slots 133 (slot number "1"), and the other of the adjacent slots 133 (slot number "2") is arranged. ), six coil conductors of U2 phase winding may be arranged. In this case, six in-phase coil conductors are arranged in the same slot 133 in the V-phase winding and the W-phase winding as well. That is, in this modification, the magnetic flux center axis of the stator coil 160 (outer diameter side coil 160o) forming the first circuits C11 and C21 and the magnetic flux center axis of the stator coil 160 forming the second circuits C12 and C22 are aligned. Match.
　＜変形例１－２＞
　さらに、トルク脈動を低減することを目的として、図１３に示すように、５層目及び６層目のコイル導体を図１２に示す配置構成に対して、１スロットだけずらして配置してもよい。本変形例では、第１回路Ｃ１１，Ｃ２１を構成するステータコイル１６０（外径側コイル１６０ｏ）の磁束中心軸Ｃｍ１と、第２回路Ｃ１２，Ｃ２２を構成するステータコイル１６０の磁束中心軸Ｃｍ２が、電気的に３０°の位相差を持っている。 <Modification 1-2>
Furthermore, for the purpose of reducing torque pulsation, as shown in FIG. 13, the coil conductors of the fifth and sixth layers may be shifted by one slot with respect to the arrangement configuration shown in FIG. . In this modification, the magnetic flux center axis Cm1 of the stator coil 160 (outer diameter side coil 160o) that constitutes the first circuits C11 and C21 and the magnetic flux center axis Cm2 of the stator coil 160 that constitutes the second circuits C12 and C22 are It electrically has a phase difference of 30°.
　図１４の左側のトルク波形図は、変形例１－１に係る回転電機１１０のトルク波形図であり、図１４の右側のトルク波形図は、変形例１－２に係る回転電機１１０のトルク波形図である。変形例１－２では、第１回路Ｃ１１，Ｃ２１と第２回路Ｃ１２，Ｃ２２に空間的な位相差３０°を持たせているため、トルク脈動の６次成分が１８０°（＝６×３０°）の位相差を持っている。つまり、第１回路Ｃ１１，Ｃ２１の磁束によるトルク波形と第２回路Ｃ１２，Ｃ２２の磁束によるトルク波形とが反転する。これにより、第１回路Ｃ１１，Ｃ２１の磁束によるトルク脈動と、第２回路Ｃ１２，Ｃ２２の磁束によるトルク脈動とが相殺される。したがって、本変形例１－２（図１３参照）では、変形例１－１（図１２参照）に比べて、回転電機１１０の合計トルクのトルク脈動を低減することができる。その結果、回転電機１１０で発生する音、振動を低減することができる。 The torque waveform diagram on the left side of FIG. 14 is a torque waveform diagram of the rotating electrical machine 110 according to the modification 1-1, and the torque waveform diagram on the right side of FIG. 14 is the torque waveform of the rotating electrical machine 110 according to the modification 1-2. It is a diagram. In modification 1-2, since the first circuits C11, C21 and the second circuits C12, C22 have a spatial phase difference of 30°, the sixth-order component of the torque ripple is 180° (=6×30° ). That is, the torque waveform due to the magnetic fluxes of the first circuits C11 and C21 and the torque waveform due to the magnetic fluxes of the second circuits C12 and C22 are inverted. As a result, the torque pulsation caused by the magnetic fluxes of the first circuits C11 and C21 and the torque pulsation caused by the magnetic fluxes of the second circuits C12 and C22 are offset. Therefore, in this modified example 1-2 (see FIG. 13), torque pulsation of the total torque of rotating electric machine 110 can be reduced compared to modified example 1-1 (see FIG. 12). As a result, it is possible to reduce the noise and vibration generated in rotating electric machine 110 .
　＜変形例２＞
　上記実施形態では、回転電機１１０を収容するモータハウジング１９１と駆動装置１７０を収容するインバータハウジング１９７とが締結部材１７によって締結されることにより一体化されている例について説明したが、本発明はこれに限定されない。図１５に示すように、回転電機１１０を収容するモータハウジング１９１と駆動装置１７０を収容するインバータハウジング１９７とは一体成形により形成されていてもよい。例えば、モータハウジング１９１とインバータハウジング１９７は、鋳造やダイキャストにより１つの構造物として成形することができる。この構成によれば、締結部材１７によってモータハウジング１９１とインバータハウジング１９７とを締結する作業が不要になるため、電動駆動システム１０の組立工数を低減できる。 <Modification 2>
In the above-described embodiment, an example in which the motor housing 191 that houses the rotating electric machine 110 and the inverter housing 197 that houses the drive device 170 are integrated by being fastened by the fastening member 17 has been described. is not limited to As shown in FIG. 15, the motor housing 191 that accommodates the rotary electric machine 110 and the inverter housing 197 that accommodates the driving device 170 may be integrally formed. For example, motor housing 191 and inverter housing 197 can be formed as one structure by casting or die casting. According to this configuration, the work of fastening the motor housing 191 and the inverter housing 197 with the fastening member 17 is not required, so the number of assembly man-hours of the electric drive system 10 can be reduced.
　＜変形例３＞
　上記実施形態では、スロット１３３に６つのコイル導体が層状に配置される例について説明したが、本発明はこれに限定されない。８つ以上のコイル導体がスロット１３３に層状に配置されていてもよい。また、スロット１３３の数、磁極数についても、上記実施形態に限定されない。 <Modification 3>
In the above embodiment, an example in which six coil conductors are arranged in layers in the slot 133 has been described, but the present invention is not limited to this. Eight or more coil conductors may be arranged in layers in the slot 133 . Also, the number of slots 133 and the number of magnetic poles are not limited to those in the above embodiment.
　＜変形例４＞
　上記実施形態では、複数の系統巻線として第１系統巻線１６０Ａと第２系統巻線１６０Ｂが設けられる例について説明したが、本発明はこれに限定されない。電動駆動システム１０は、３つ以上の系統巻線と、各系統巻線に個別に接続された３つ以上のインバータとを備える構成であってもよい。回転電機１１０の毎極毎相スロット数ＮＳＰＰは、インバータの数に一致する。毎極毎相スロット数ＮＳＰＰが２の回転電機１１０では、２つのインバータと２つの系統巻線とを備えた高効率の電動駆動システム１０を得ることができる。毎極毎相スロット数ＮＳＰＰが３の回転電機１１０では、３つのインバータと３つの系統巻線とを備えた電動駆動システムを得ることができる。３つのインバータと、各インバータに個別に接続された３つの系統巻線とを備えた電動駆動システムの回転電機は、例えば、スロット数が７２、磁極数が８の構成を採用することができる。 <Modification 4>
In the above embodiment, the example in which the first system winding 160A and the second system winding 160B are provided as the plurality of system windings has been described, but the present invention is not limited to this. The electric drive system 10 may be configured to include three or more system windings and three or more inverters individually connected to each system winding. The number of slots NSPP per phase per pole of rotating electric machine 110 matches the number of inverters. In the rotating electric machine 110 having the number of slots per pole per phase NSPP of 2, a highly efficient electric drive system 10 including two inverters and two system windings can be obtained. In the rotating electric machine 110 having the number of slots per pole per phase NSPP of 3, an electric drive system having three inverters and three system windings can be obtained. A rotating electrical machine of an electric drive system including three inverters and three system windings individually connected to each inverter can employ, for example, a configuration with 72 slots and 8 magnetic poles.
　＜変形例５＞
　上記実施形態では、自動車に搭載される電動駆動システム１０を例に説明したが、本発明はこれに限定されない。エレベータ、鉄道車両等、回転電機によって駆動力を発生させる種々の移動体に本発明を適用することができる。なお、電動駆動システムは、移動体に搭載される場合に限定されることもない。 <Modification 5>
In the above-described embodiment, the electric drive system 10 mounted on an automobile has been described as an example, but the present invention is not limited to this. The present invention can be applied to various moving bodies such as elevators, railway vehicles, and the like, which generate driving force by rotating electric machines. It should be noted that the electric drive system is not limited to being mounted on a moving body.
　以上、本発明の実施形態について説明したが、上記実施形態は本発明の適用例の一部を示したに過ぎず、本発明の技術的範囲を上記実施形態の具体的構成に限定する趣旨ではない。 Although the embodiments of the present invention have been described above, the above embodiments merely show a part of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments. do not have.
　１０…電動駆動システム、１７…締結部材、１１０…回転電機、１３０…ステータ、１３１…ステータコア、１３３…スロット、１３４…ティース、１３５…コアバック、１５０…ロータ、１５１…ロータコア、１５２…永久磁石、１５３…磁石挿入孔、１５９…シャフト、１６０…ステータコイル、１６０Ａ…第１系統巻線、１６０Ｂ…第２系統巻線、１６０ｉａ…第１内径側コイル、１６０ｉｂ…第２内径側コイル、１６０ｏ…外径側コイル、１６１…スロット内導体（コイル導体）、１６８…接続用導体、１６９…絶縁材、１７０…駆動装置、１７１Ａ…第１インバータ、１７１Ｂ…第２インバータ、１７６…制御回路（制御装置）、１７９…蓄電装置（電源装置）、１９０…筐体、１９１…モータハウジング、１９７…インバータハウジング、１９８…ギヤハウジング、Ｃ１１…第１回路、Ｃ１２…第２回路、Ｃ２１…第１回路、Ｃ２２…第２回路、Ｃａ…回転中心軸、Ｃｍ１，Ｃｍ２…磁束中心軸 DESCRIPTION OF SYMBOLS 10... Electric drive system, 17... Fastening member, 110... Rotating electric machine, 130... Stator, 131... Stator core, 133... Slot, 134... Teeth, 135... Core back, 150... Rotor, 151... Rotor core, 152... Permanent magnet, 153... Magnet insertion hole 159... Shaft 160... Stator coil 160A... First system winding 160B... Second system winding 160ia... First inner diameter side coil 160ib... Second inner diameter side coil 160o... Outside Radial side coil 161... In-slot conductor (coil conductor) 168... Connection conductor 169... Insulating material 170... Drive device 171A... First inverter 171B... Second inverter 176... Control circuit (control device) , 179... Power storage device (power supply device) 190... Case 191... Motor housing 197... Inverter housing 198... Gear housing C11... First circuit C12... Second circuit C21... First circuit C22... Second circuit, Ca... rotation center axis, Cm1, Cm2... magnetic flux center axis

Claims (10)

  1. 　ステータと前記ステータの内周側に回転可能に配置されるロータとを有する回転電機と、前記回転電機に電力を供給する駆動装置と、を備える電動駆動システムであって、
    　前記ステータは、平角線からなるステータコイルと、前記ステータコイルが配置される複数のスロットを有するステータコアと、を有し、
    　前記ステータコイルは、前記ステータコアに波巻きで装着される複数の系統巻線を有し、
    　前記複数の系統巻線は、基準位相と空間的に位相差０°で前記ステータコアに装着される第１系統巻線と、前記基準位相と空間的に位相差ｎ°で前記ステータコアに装着される第２系統巻線と、を有し、
    　前記ｎ°は、３６０°／（前記スロットの数／極対数）であり、
    　前記第１系統巻線及び前記第２系統巻線は、それぞれ、前記ステータコアの外径側のコイル導体により形成される第１回路と、前記ステータコアの内径側のコイル導体により形成される並列回路である第２回路と、が直列に接続され、
    　前記内径側のコイル導体は、前記外径側のコイル導体よりも厚みが小さく、
    　前記駆動装置は、前記第１系統巻線に接続される第１インバータと、前記第２系統巻線に接続される第２インバータと、を有し、
    　前記駆動装置は、前記第１系統巻線及び前記第２系統巻線に対し、時間的に前記ｎ°の位相差で電圧を印加する、
    　電動駆動システム。     An electric drive system comprising: a rotating electric machine having a stator and a rotor rotatably arranged on an inner peripheral side of the stator; and a driving device for supplying electric power to the rotating electric machine,
    The stator has a stator coil made of a rectangular wire and a stator core having a plurality of slots in which the stator coil is arranged,
    The stator coil has a plurality of system windings that are wave-wound on the stator core,
    The plurality of system windings include a first system winding mounted on the stator core with a spatial phase difference of 0° from a reference phase, and a first system winding mounted on the stator core with a spatial phase difference of n° from the reference phase. and a second system winding,
    The n ° is 360 ° / (number of slots / number of pole pairs),
    The first winding system and the second winding system are respectively a first circuit formed by a coil conductor on the outer diameter side of the stator core and a parallel circuit formed by a coil conductor on the inner diameter side of the stator core. A second circuit and a are connected in series,
    The coil conductor on the inner diameter side is thinner than the coil conductor on the outer diameter side,
    The driving device has a first inverter connected to the first system winding and a second inverter connected to the second system winding,
    The driving device applies a voltage to the first system winding and the second system winding with a temporal phase difference of n°.
    electric drive system.
  2. 　請求項１に記載の電動駆動システムにおいて、
    　前記回転電機の毎極毎相スロット数は２である、
    　電動駆動システム。     The electric drive system according to claim 1,
    The number of slots per pole per phase of the rotating electric machine is 2,
    electric drive system.
  3. 　請求項１に記載の電動駆動システムにおいて、
    　前記系統巻線は、複数の周回巻線を有し、
    　前記スロットには、複数の前記コイル導体が径方向に層状に配置され、
    　前記第２回路は、前記複数の周回巻線が直列に接続された第１の直列回路と、前記複数の周回巻線が直列に接続された第２の直列回路と、が並列に接続され、
    　前記スロットの内周側から外周側に向かって順に１層目、２層目、・・・、ｍ層目、ｍ＋１層目とした場合、前記第１の直列回路を構成するｓ，ｓ＋１層目（ｓは、１～ｍまでの奇数）に配置される周回巻線の数と、前記第２の直列回路を構成する前記ｓ，ｓ＋１層目に配置される周回巻線の数は一致する、
    　電動駆動システム。     The electric drive system according to claim 1,
    The system winding has a plurality of winding windings,
    A plurality of the coil conductors are arranged in layers in the radial direction in the slots,
    wherein the second circuit includes a first series circuit in which the plurality of winding windings are connected in series and a second series circuit in which the plurality of winding windings are connected in series, which are connected in parallel;
    , m-th layer, and m+1-th layer in order from the inner peripheral side to the outer peripheral side of the slot, the s and s+1-th layers constituting the first series circuit (s is an odd number from 1 to m) and the number of winding windings arranged in the s and s+1th layers constituting the second series circuit is the same,
    electric drive system.
  4. 　請求項１に記載の電動駆動システムにおいて、
    　前記第１回路を構成する前記ステータコイルの磁束中心軸と前記第２回路を構成する前記ステータコイルの磁束中心軸が電気的に３０°の位相差を持つ、
    　電動駆動システム。     The electric drive system according to claim 1,
    The magnetic flux center axis of the stator coil that constitutes the first circuit and the magnetic flux center axis of the stator coil that constitutes the second circuit electrically have a phase difference of 30°,
    electric drive system.
  5. 　請求項１に記載の電動駆動システムにおいて、
    　前記第１回路と前記第２回路とが接続用導体によって接続される、
    　電動駆動システム。     The electric drive system according to claim 1,
    wherein the first circuit and the second circuit are connected by a connecting conductor;
    electric drive system.
  6. 　請求項１に記載の電動駆動システムにおいて、
    　前記スロットの内周面と前記コイル導体との間、及び、前記スロット内の複数の前記コイル導体同士の間には、絶縁材が設けられている、
    　電動駆動システム。     The electric drive system according to claim 1,
    An insulating material is provided between the inner peripheral surface of the slot and the coil conductor, and between the plurality of coil conductors in the slot,
    electric drive system.
  7. 　請求項１に記載の電動駆動システムにおいて、
    　前記第１インバータと前記第２インバータとが同一の電源装置に接続されている、
    　電動駆動システム。     The electric drive system according to claim 1,
    The first inverter and the second inverter are connected to the same power supply device,
    electric drive system.
  8. 　請求項１に記載の電動駆動システムにおいて、
    　前記第１インバータと前記第２インバータには同一の制御装置からの指令が入力される、
    　電動駆動システム。     The electric drive system according to claim 1,
    A command from the same control device is input to the first inverter and the second inverter,
    electric drive system.
  9. 　請求項１に記載の電動駆動システムにおいて、
    　前記回転電機を収容するハウジングと前記駆動装置を収容するハウジングとが締結部材によって締結されることにより一体化されている、
    　電動駆動システム。     The electric drive system according to claim 1,
    A housing that accommodates the rotating electric machine and a housing that accommodates the driving device are integrated by being fastened by a fastening member,
    electric drive system.
  10. 　請求項１に記載の電動駆動システムにおいて、
    　前記回転電機を収容するハウジングと前記駆動装置を収容するハウジングとは一体成形により形成されている、
    　電動駆動システム。     The electric drive system according to claim 1,
    The housing that accommodates the rotating electric machine and the housing that accommodates the driving device are integrally formed,
    electric drive system.
PCT/JP2022/004889 2021-05-25 2022-02-08 Electric drive system WO2022249568A1 (en)

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JP2016167963A (en) * 2014-11-10 2016-09-15 デンソートリム株式会社 Dynamo-electric machine for internal combustion engine
WO2019159579A1 (en) * 2018-02-15 2019-08-22 日立オートモティブシステムズ株式会社 Motor and motor device

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JP2012157236A (en) * 2011-01-04 2012-08-16 Asmo Co Ltd Brushless motor and brushless motor drive method
JP2014090615A (en) * 2012-10-31 2014-05-15 Aisin Seiki Co Ltd Wave winding for three-phase rotary electric machine
JP2016167963A (en) * 2014-11-10 2016-09-15 デンソートリム株式会社 Dynamo-electric machine for internal combustion engine
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