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公开(公告)号：US20210044238A1
公开(公告)日：2021-02-11
申请号：US16977177
申请日：2018-12-11
Applicant: Hitachi, Ltd.
Inventor： Akeshi TAKAHASHI , Yoshitaka IWAJI , Shinji SUGIMOTO
Abstract: A rotating machine drive system includes: a rotating machine that includes a plurality of windings; a phase current detecting circuit that detects a phase current to be supplied to the rotating machine; an inverter device that includes an inverter circuit that converts DC power from a DC power supply into AC power, and a control device that controls power conversion being performed by an inverter main circuit on the basis of the phase current detected by the phase current detecting circuit, the inverter device operating the rotating machine at a variable speed; and a winding switching device that switches connections of the plurality of windings in accordance with a command from the control device. In a case where the rotation zone of the rotating machine is to be changed, the control device stops the current supply from the inverter circuit to the rotating machine, and switches the rotation zone of the rotating machine from a low-speed rotation zone to a high-speed rotation zone, or from the high-speed rotation zone to the low-speed rotation zone, on condition that a line internal voltage induced by a field magnetic flux of the rotating machine is lower than the DC voltage of the DC power supply.
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公开(公告)号：US20240322628A1
公开(公告)日：2024-09-26
申请号：US18578362
申请日：2022-08-01
Applicant: Hitachi, Ltd.
Inventor： Tetsuya SUTO , Akeshi TAKAHASHI , Makoto ITO
CPC classification number: H02K3/28 , H02K1/16 , H02K5/203 , B60K7/0007 , H02K2203/09
Abstract: A rotary electrical machine comprises a cylindrical stator that generates a magnetic field, a rotor that generates torque through the magnetic field, and a housing that accommodates the stator. The housing comprises a housing body covering an outer circumferential part of the stator, and a housing lid part attached to one end side of the housing body. The stator comprises a stator core having a plurality of teeth, and a stator coil mounted on the stator core, and the stator coil has a plurality of windings wound onto the plurality of teeth, and a crossover wire connecting at least two of the plurality of windings. The crossover wire comprises an insertion mechanism that is provided to the housing lid part and electrically connects end parts of the windings and an end part of the crossover wire through insertion contact.
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3.发明公开公开(公告)号：US20240162761A1
公开(公告)日：2024-05-16
申请号：US18281729
申请日：2022-01-14
Applicant: Hitachi, Ltd.
Inventor： Tetsuya SUTO , Akeshi TAKAHASHI , Makoto ITO
CPC classification number: H02K1/16 , B60K7/0007 , H02K3/28 , B60K2007/0061 , H02K2213/03
Abstract: The purpose of the present invention is to provide: a stator for a dynamo-electric machine, with which axial size can be reduced; and, an electrically powered wheel provided with the stator for the dynamo-electric machine. A stator 10 for a dynamo-electric machine is provided with a stator core 100, a plurality of coils 201A-201D, and jumper wires 202A-202C. The stator core 100 has first teeth 101 around which a coil is wound and second teeth 102 around which a coil is not wound. The first teeth 101 and the second teeth 102 are disposed alternatingly in the circumferential direction. The jumper wire 202 extends circumferentially and radially with a bent section to absorb variations in the spacing between one coil and another, and is disposed at a position overlapping the second teeth 102 when viewed from the axial direction of the dynamo-electric machine. Further, the jumper wire 202 is disposed closer to the stator core 100 relative to an axial end of a coil at least partially wound around the first teeth 101.
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4.发明公开公开(公告)号：US20230223824A1
公开(公告)日：2023-07-13
申请号：US18009894
申请日：2021-03-01
Applicant: Hitachi, Ltd.
Inventor： Takafumi HARA , Makoto ITO , Akeshi TAKAHASHI , Toshiyuki AJIMA
Abstract: A motor control device of the present invention is connected to a power converter for converting power from direct current power to alternating current power, and controls the drive of an alternating current motor that is driven using said alternating current power, and the motor control device is provided with: a carrier wave generator; a carrier wave frequency adjuster that adjusts the frequency of the carrier wave; and a gate signal generator that uses the carrier wave to pulse width modulate a voltage command according to a torque command, and generates a gate signal for controlling operation of the power converter, wherein the carrier wave frequency adjuster adjusts the voltage command and carrier wave phase difference to reduce eddy current loss generated in rotor magnets of the alternating current motor according to a d-axis current flowing to the alternating current motor and the rotational speed of the alternating current motor.
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公开(公告)号：US20190109514A1
公开(公告)日：2019-04-11
申请号：US16124373
申请日：2018-09-07
Applicant: Hitachi, Ltd.
Inventor： Ryuuichirou IWANO , Masanori SAWAHATA , Akeshi TAKAHASHI
Abstract: A rotating electrical machine includes a rotating electrical machine body including a stator, a rotor, a fan configured to circulate a coolant for cooling the stator and the rotor, and a casing containing the stator, the rotor and the fan; and a cooler connected to the rotating electrical machine body. The coolant flows from the machine body into the cooler. The cooler cools the coolant. The coolant flows out of the cooler into the machine body. The cooler has a flow resistance Ra satisfying a relation 0.15
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Patent Agency Ranking
公开(公告)号：US20240253447A1
公开(公告)日：2024-08-01
申请号：US18292549
申请日：2022-07-15
Applicant: Hitachi, Ltd.
Inventor： Tetsuya SUTO , Akeshi TAKAHASHI , Makoto ITO
CPC classification number: B60K7/0007 , H02K1/16 , H02K7/102 , H02K9/19
Abstract: An in-wheel motor with improved driving force has a simplified cooling structure for the motor and a braking device. The in-wheel motor has a motor that transmits motive power to a wheel, at least a portion of the motor being disposed inside the wheel; a first cooling part and a second cooling part that cool a stator of the motor; and a braking device that applies braking to the wheel. The braking device 25 is formed from a brake disc that rotates with the wheel and a brake caliper that induces braking by imparting friction to the brake disc. The brake caliper operates in the axial direction of the motor to induce braking in the brake disc. A portion of an axial-direction end of the brake caliper is in contact with the stator. The first cooling part and the second cooling part cool the braking device through the stator.
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公开(公告)号：US20240039355A1
公开(公告)日：2024-02-01
申请号：US18039772
申请日：2021-10-20
Applicant: Hitachi, Ltd.
Inventor： Akeshi TAKAHASHI , Tetsuya SUTO , Makoto ITO
CPC classification number: H02K3/28 , H02K15/0407 , H02K15/0081 , B60L50/51 , B21D28/26 , B60L2210/40
Abstract: A rotating electrical machine according to the present invention has a plurality of segmented coils respectively disposed in a plurality of layers aligned in a row in a radial direction inside a slot of a stator core. The segmented coils comprise: first regions (111a, 121a) that each have a straight line section disposed inside the slot and a protrusion that protrudes to the outside of the slot from one end of the straight line section; and second regions (112a, 122a) that are formed so as to extend toward one side in the circumferential direction from the other end of the respective straight line section, and such that the position in the radial direction changes. The tip end section of the second region (112a) of a first segmented coil (110a) disposed in a prescribed layer within a prescribed slot is disposed and connected so as to be adjacent, in the radial direction, to the tip end section of the first region (121a) of a second segmented coil (120a) disposed in the prescribed layer within a slot adjacent to the prescribed slot.
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公开(公告)号：US20230268790A1
公开(公告)日：2023-08-24
申请号：US18020206
申请日：2021-05-25
Applicant: Hitachi, Ltd.
Inventor： Makoto ITO , Tetsuya SUTO , Akeshi TAKAHASHI
Abstract: A rotary electric machine (100) comprising, in order to increase a torque density, a stator (101) and a rotor (102) provided so as to be rotatable about the axial center (C), wherein: phase coils (120G) each having a substantially rectangular coil-cross-section are arranged in a row in the radial direction in a slot (110) so as to constitute a plurality of layers; the phase coils (120G) are each wound over a group of three or more slots (110) which are contiguously arranged in the circumferential direction; identical-phase slots (111) are provided on each of which only a combination of phase coils (120G) of an identical phase are arranged; different-phase slots (112) are provided on each of which only a combination of phase coils (120G) of two different phases are arranged; and the different-phase slots (112) are disposed one by one so as to be adjacent to respective two sides of sets of identical-phase slots (111) comprising at least two slots arranged contiguously in the circumferential direction.
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公开(公告)号：US20240317015A1
公开(公告)日：2024-09-26
申请号：US18578034
申请日：2022-06-28
Applicant: Hitachi, Ltd.
Inventor： Akeshi TAKAHASHI , Hiroyuki TOYODA , Masaki KOYAMA , Yuji ENOMOTO , Kinya NAKATSU
CPC classification number: B60H1/00392 , B60H1/00321 , B60H1/00485 , B60H1/143
Abstract: The purpose of the present invention is to provide a low-cost heat cycle system that can reduce power consumption; an in-wheel motor that is driven by using this heat cycle system; and a vehicle in which this heat cycle system is installed. This heat cycle system is provided with: a compressor; an accumulator; an electric drive unit comprising an electric motor; a refrigerant compressed by the compressor; and an indoor heat exchanger and an outdoor heat exchanger responsible for heat exchange of the refrigerant. The heat cycle system comprises a four-way valve that comprises a single circulation path for circulating the refrigerant and that can switch the connection destination of a refrigerant discharge section of the compressor to the indoor heat exchanger or the outdoor heat exchanger. A cooling unit of the electric drive unit is arranged upstream of the accumulator in the flow of the refrigerant.
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公开(公告)号：US20240097524A1
公开(公告)日：2024-03-21
申请号：US18267286
申请日：2021-11-25
Applicant: Hitachi, Ltd.
Inventor： Akeshi TAKAHASHI , Tetsuya SUTO , Makoto ITO
CPC classification number: H02K5/203 , B60K7/0007 , H02K5/165 , H02K9/197 , H02K2209/00
Abstract: This rotating electric machine comprises: a stator having a stator core around which a plurality of coils are wound; a rotor supported to be rotatable relative to the stator with a predetermined gap therebetween; a rotor case that holds the rotor; and a first bearing and a second bearing that rotatably support the rotor case. The rotating electric machine includes: a first flow path formation body that forms a first flow path through which a refrigerant flows to a coil end part protruding from the stator core; a first case part which forms an accommodation space of the first bearing, is connected to the first flow path of the first flow path formation body, and fills the accommodation space with the refrigerant; a second flow path formation body which forms a second flow path through which the refrigerant flows to a coil end part disposed on the opposite side from the coil end part in the axial direction; and a second case part which forms an accommodation space of the second bearing, is connected to the second flow path of the second flow path formation body, and fills the accommodation space with the refrigerant.
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