Abstract: A motor-driven compressor includes an inverter device. The inverter device includes a common mode choke coil. The common mode choke coil includes an annular core, two windings wound around the core, and an annular conductor that covers the two windings. The conductor is divided into a first metal plate and a second metal plate, which are combined to form an annular shape such that induced current flows in a circumferential direction of the conductor so as to hinder changes in leakage magnetic flux from the core. The second metal plate is thermally connected to the housing. The first metal plate is thermally connected to the second metal plate. At least one of an electrical resistance value or a thermal resistance value in a current path of the induced current is lower in the second metal plate than in the first metal plate.

Abstract: A damping unit includes a damping bent portion having the form of a flat plate and bent from a damping side portion. The damping bent portion is thermally coupled to a heat dissipation surface. This transfers the heat generated by the damping unit from the damping bent portion, in addition to the damping side portion, to the heat dissipation surface of an inverter case.

Abstract: A motor-driven compressor includes an inverter device. The inverter device includes a noise reducing unit. The noise reducing unit includes common-mode choke coils and a smoothing capacitor. The common-mode choke coils include a first coil and a second coil. The first coil includes a first core, a first winding, and a second winding. The first core includes a first straight portion and a second straight portion. The second coil includes a second core, a third winding, and a fourth winding. The second core includes a third straight portion and a fourth straight portion. The first coil and the second coil are arranged side by side such that a current flowing through the first winding and the third winding generates an annular magnetic flux that passes through both of the first straight portion and the third straight portion.

Abstract: An in-vehicle motor-driven compressor includes a common mode choke coil including an annular core having a through-hole, a first winding and a second winding wound around the core, and an annular conductor. The second winding is opposed to the first winding while being spaced apart from the first winding. The conductor surrounds the first and second windings, and the core. The conductor includes sections opposed to each other with the through-hole in between. The core is symmetrical with respect to at least one symmetry axis when the through-hole is viewed from the front. The first winding is located on one side of the at least one symmetry axis, and the second winding is located on the other side of the symmetry axis, so that the at least one symmetry axis is located between the first and second windings. The core includes an exposed section not covered with the conductor.

Abstract: An on-vehicle motor-driven compressor includes an inverter device having a noise reducer. The noise reducer includes a common mode choke coil. The common mode choke coil includes an annular core, first and second windings wound around the core, the second winding being spaced apart from and opposed to the first winding, an annular conductor that extends over the first winding and the second winding and covers the core, and an insulating layer located between an inner circumferential surface of the conductor and outer surfaces of the first winding and the second winding. The conductor is tubular and belt-shaped. The core includes an exposed portion that is not covered by the conductor. The insulating layer is tubular and belt-shaped. An entirety of the conductor is arranged within a range between opposite ends of the insulating layer.

Abstract: A metal film includes portions that are opposed to each other and located away from each other between the first winding and the second winding. The metal film includes the first linear part that is thermally coupled to a housing. The average value of electric resistance per unit length in the peripheral direction of the first linear part of the metal film is greater than an average value of electric resistance per unit length of locations other than the first linear part.

Abstract: A vehicle electric compressor includes a compression part, an electric motor, and an inverter device. The inverter device includes a noise reduction unit that includes a common mode choke coil. The common mode choke coil includes a core, a first winding wire, a second winding wire, and an electrical conductor that covers the core. The electrical conductor has a first insulation layer and a second insulation layer. The first insulation layer, the electrical conductor, and the second insulation layer form a laminated body including a loop-shaped portion that covers the core and a joint portion.

Abstract: An on-vehicle motor-driven compressor includes an inverter device having a noise reducer. The noise reducer includes a common mode choke coil. The common mode choke coil includes an annular core, first and second windings wound around the core, the second winding being spaced apart from and opposed to the first winding, an annular conductor that extends over the first winding and the second winding and covers the core, and an insulating layer located between an inner circumferential surface of the conductor and outer surfaces of the first winding and the second winding. The conductor is tubular and belt-shaped. The core includes an exposed portion that is not covered by the conductor. The insulating layer is tubular and belt-shaped. An entirety of the conductor is arranged within a range between opposite ends of the insulating layer.

Abstract: An in-vehicle motor-driven compressor includes a common mode choke coil including an annular core having a through-hole, a first winding and a second winding wound around the core, and an annular conductor. The second winding is opposed to the first winding while being spaced apart from the first winding. The conductor surrounds the first and second windings, and the core. The conductor includes sections opposed to each other with the through-hole in between. The core is symmetrical with respect to at least one symmetry axis when the through-hole is viewed from the front. The first winding is located on one side of the at least one symmetry axis, and the second winding is located on the other side of the symmetry axis, so that the at least one symmetry axis is located between the first and second windings. The core includes an exposed section not covered with the conductor.

Abstract: An in-vehicle motor-driven compressor includes a common mode choke coil. The common mode choke coil includes an annular core having a through-hole, a first winding and a second winding wound around the core, and a coated conductive wire. The second winding is opposed to the first winding while being spaced apart from the first winding. The coated conductive wire is wound around the core so as to surround the first winding, the second winding, and the core. The coated conductive wire has sections that are opposed to each other with the through-hole in between. An electric wire of the coated conductive wire is wound multiple turns around the core so as to at least partly overlap with the first and second windings. Both ends of the electric wire are electrically connected to each other. The core includes an exposed section that is not covered with the coated conductive wire.

Abstract: An on-vehicle motor-driven compressor includes a compression unit, an electric motor, and an inverter device. The inverter device includes an inverter circuit and a noise reducer. The noise reducer includes a common-mode choke coil and a smoothing capacitor. The common-mode choke coil includes a loop-shaped core, a first winding wound around the core, a second winding wound around the core, the second winding being spaced apart from and opposed to the first winding, and a loop-shaped conductor that covers the core while extending over the first winding and the second winding. The core includes an exposed portion that is not covered with the conductor. Parts of the conductor that are opposed to each other between the first winding and the second winding are spaced apart from each other.

Abstract: A metal film includes portions that are opposed to each other and located away from each other between the first winding and the second winding. The metal film includes the first linear part that is thermally coupled to a housing. The average value of electric resistance per unit length in the peripheral direction of the first linear part of the metal film is greater than an average value of electric resistance per unit length of locations other than the first linear part.

Abstract: An electric compressor includes a compression portion, an electric motor portion, a motor drive circuit portion, and a housing in which the compression portion, the electric motor portion, and the motor drive circuit portion are arranged in this order in an axial direction. The electric compressor further includes a partition wall, a refrigerant inlet, and a conductive member. The refrigerant inlet is disposed at a position in the housing closer to a partition wall than to the compression portion. The conductive member electrically connects the motor drive circuit portion and the electric motor portion. The electric compressor includes a shield member configured to block flow of refrigerant taken in through the refrigerant inlet and flowing toward the conductive member. The shield member is disposed in the electric motor portion so as to be located between the refrigerant inlet and the conductive member.

Abstract: An on-vehicle motor-driven compressor includes a compression unit, an electric motor, and an inverter device. The inverter device includes an inverter circuit and a noise reducer. The noise reducer includes a common-mode choke coil and a smoothing capacitor. The common-mode choke coil includes a loop-shaped core, a first winding wound around the core, a second winding wound around the core, the second winding being spaced apart from and opposed to the first winding, and a loop-shaped conductor that covers the core while extending over the first winding and the second winding. The core includes an exposed portion that is not covered with the conductor. Parts of the conductor that are opposed to each other between the first winding and the second winding are spaced apart from each other.

Abstract: A motor-driven compressor for a vehicle includes a housing, a compression unit, a motor, and an inverter device. The inverter device includes an inverter circuit, a capacitor, a current sensor, a determination means configured to control switching elements in response to the current sensor not detecting a flow of current when the motor stops operating and configured to determine whether or not the current sensor detects a flow of current when controlling the switching elements, and a discharge starting means configured to start discharging the capacitor when the determination means determines that the flow of current has not been detected.

Abstract: A motor-driven fluid machine has three motor wires. The innermost one of the three motor wires in the radial direction of a rotary shaft on a specific section of an outer end portion of a coil end is defined as a first motor wire. The first motor wire has a first extension, which extends from an inner side toward an outer side in the radial direction of the rotary shaft at a position between the specific section and a downstream side in the extending direction of the motor wires, and a second extension, which is continuous from the first extension and extends from the outer side toward the inner side in the radial direction of the rotary shaft to be connected to a corresponding conductive member.

Abstract: A motor-driven compressor for a vehicle includes a housing, a compression unit, a motor, and an inverter device. The inverter device includes an inverter circuit, a capacitor, a current sensor, a determination means configured to control switching elements in response to the current sensor not detecting a flow of current when the motor stops operating and configured to determine whether or not the current sensor detects a flow of current when controlling the switching elements, and a discharge starting means configured to start discharging the capacitor when the determination means determines that the flow of current has not been detected.

Abstract: An electric compressor includes a compression portion, an electric motor portion, a motor drive circuit portion, and a housing in which the compression portion, the electric motor portion, and the motor drive circuit portion are arranged in this order in an axial direction. The electric compressor further includes a partition wall, a refrigerant inlet, and a conductive member. The refrigerant inlet is disposed at a position in the housing closer to a partition wall than to the compression portion. The conductive member electrically connects the motor drive circuit portion and the electric motor portion. The electric compressor includes a shield member configured to block flow of refrigerant taken in through the refrigerant inlet and flowing toward the conductive member. The shield member is disposed in the electric motor portion so as to be located between the refrigerant inlet and the conductive member.

Abstract: An overlapping portion of an insulating portion formed in an annular shape is held between a workbench having a linear projection and an ultrasonic horn having a circular projection with at least part of the linear projection and of the circular projection opposed to each other and ultrasonically welded. In the ultrasonic welding, even though the ultrasonic horn under ultrasonic vibration rotates on the overlapping portion of the insulating portion, the area in the overlapping portion held between the linear projection and the circular projection with at least part of the linear projection and of the circular projection opposed to each other is not reduced after ultrasonic vibration is applied to the ultrasonic horn.

Abstract: Annular portions of a first interphase insulting sheet have void portions. After a U-phase coil is inserted in wave winding, bridge portions are mounted to slots for an adjacent V-phase coil. The void portions are formed at positions corresponding to the bridge portions that are disposed between any two of coil ends. The annular portions are stretched to form a generally pentagon shape, which facilitates mounting of the V-phase coil. The void portions formed at positions that do not need insulation will not impair the insulating function of the first interphase insulating sheet. The void portions formed in alignment with extension of the bridge portions will not cause a drop in the strength of the annular portions.