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 on-board electric compressor that comprises: a housing; a compression unit; an electric motor; and an inverter device. The inverter device comprises: an inverter circuit that converts direct current power to alternating current power; and a noise reduction unit that is provided on an input side of the inverter circuit and that reduces common mode noise and normal mode noise that are included in the direct current power. The noise reduction unit comprises: a common mode choke coil; and a smoothing capacitor that, in cooperation with the common mode choke coil, constitutes a low pass filter circuit. The common mode choke coil has: a core that has a first core part and a second core part; a first winding that is wound around the first core part; and a second winding that is wound around the second core part.

Abstract: An on-board fluid machine includes a housing configured to allow fluid to flow into the housing, an electric motor accommodated in the housing, and a driver that is supplied with DC power and drives the electric motor. The driver includes a low-pass filter circuit and an inverter circuit. The low-pass filter circuit includes a common mode choke coil and a capacitor. The driver further includes a damping unit located at a position where magnetic field lines produced by the common mode choke coil generate eddy current.

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-board fluid machine includes a housing configured to allow fluid to flow into the housing, an electric motor accommodated in the housing, and a driver that is supplied with DC power and drives the electric motor. The driver includes a low-pass filter circuit and an inverter circuit. The low-pass filter circuit includes a common mode choke coil and a capacitor. The driver further includes a damping unit located at a position where magnetic field lines produced by the common mode choke coil generate eddy current.

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 case, a loop-shaped core accommodated in the case, a first winding and a second winding that are wound around the case, and a loop-shaped conductor that covers the core and the case. Parts of the conductor that are opposed to each other between the first winding and the second winding are spaced apart from each other. The case includes two projections that project from an outer surface of the case. The conductor is held by the two projections such that the conductor is spaced apart from the first winding and the second winding.

Abstract: The control section controls the electric motor to be driven such that the number of revolutions becomes equal to the target number of revolutions. If the control section sets the target number of revolutions to a number of revolutions of the electric motor requested by another control section, the control section changes the number of revolutions of the electric motor at an increase rate lower than or equal to the upper limit value of the increase rate or at a decrease rate lower than or equal to the upper limit value of the decrease rate. If the control section sets the target number of revolutions to a number-of-revolutions limit value, which is determined based on the voltage of a vehicle battery, the control section is able to decrease the number of revolutions of the electric motor at a decrease rate exceeding the upper limit value.

Abstract: An in-vehicle inverter device includes a noise reduction circuit, which has a common mode choke coil configured to reduce common mode noise and normal mode noise contained in DC power, and an inverter circuit, which receives the DC power in which the noise has been reduced. The noise reduction circuit includes: an input-side capacitor and an input-side resistor provided on the input side of the choke coil; an output-side capacitor and an output-side resistor provided on the output side of the choke coil; a first filter circuit that includes the choke coil, the input-side capacitor, and the input-side resistor; and a second filter circuit that includes the choke coil, the output-side capacitor, and the output-side resistor. The first and the second filter circuits reduce leakage noise generated in the inverter circuit.

Abstract: A motor-driven compressor includes a compression unit that includes movable and fixed scrolls and a compression chamber, an electric motor that includes a rotor and drives the compression unit, a motor drive circuit that drives the electric motor, an injection port that draws intermediate pressure refrigerant into the compression chamber, a controller that performs rotation control on the rotor, and a voltage detector that detects a terminal voltage of the electric motor. The compression unit compresses low pressure refrigerant drawn into the compression chamber to discharge high pressure refrigerant. The controller is configured to output a stop instruction to deactivate the rotation control of the rotor, determine a rotation condition of the rotor based on the voltage detected by the voltage detector after outputting the stop instruction, and perform, based on the determination, restart preparation control that includes outputting a lock instruction to electrically stop rotation of the rotor.

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 case, a loop-shaped core accommodated in the case, a first winding and a second winding that are wound around the case, and a loop-shaped conductor that covers the core and the case. Parts of the conductor that are opposed to each other between the first winding and the second winding are spaced apart from each other. The case includes two projections that project from an outer surface of the case. The conductor is held by the two projections such that the conductor is spaced apart from the first winding and the second winding.

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: This on-vehicle power conversion apparatus is provided with: a power conversion circuit to which DC power is inputted; and a noise reduction unit that is configured to reduce common-mode noise and normal-mode noise which are included in the DC power and that is provided to the input side of the power conversion circuit. The noise reduction unit is provided with: a core having a first core part and a second core part; a common-mode chalk coil having a first winding wire wound around the first core part and a second winding wire wound around the second coil part; and a smoothing capacitor that constitutes a low-pass filter circuit cooperatively with the common-mode chalk coil. The power conversion apparatus is further provided with a damping unit provided at a position intersecting the magnetic path of a magnetic flux leakage.

Abstract: This on-vehicle power conversion apparatus is provided with: a power conversion circuit to which DC power is inputted; and a noise reduction unit that is configured to reduce common- mode noise and normal-mode noise which are included in the DC power and that is provided to the input side of the power conversion circuit. The noise reduction unit is provided with: a core having a first core part and a second core part; a common-mode chalk coil having a first winding wire wound around the first core part and a second winding wire wound around the second coil part; and a smoothing capacitor that constitutes a low-pass filter circuit cooperatively with the common-mode chalk coil. The power conversion apparatus is further provided with a damping unit provided at a position intersecting the magnetic path of a magnetic flux leakage.

Abstract: When the magnitude of a motor current Iu is smaller than a threshold value at a timing when a polarity of the motor current Iu is expected to be reversed after the elapse of one control cycle, a control device sets a correction amount of a width of a pulse generated by PWM control at a correction amount +?. When the magnitude of the motor current is greater than the threshold value at the timing, the control device sets the correction amount of the width of the pulse generated by the PWM control at zero or a value ? smaller than the correction amount +?. As a result, an error of a dead time period in inverter control can be reduced.

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 on-board fluid machine includes a housing configured to allow fluid to flow into the housing, an electric motor accommodated in the housing, and a driver that is supplied with DC power and drives the electric motor. The driver includes a low-pass filter circuit and an inverter circuit. The low-pass filter circuit includes a common mode choke coil and a capacitor. The driver further includes a damping unit located at a position where magnetic field lines produced by the common mode choke coil generate eddy current.

Abstract: An on-board fluid machine includes a housing configured to allow fluid to flow into the housing, an electric motor accommodated in the housing, and a driver that is supplied with DC power and drives the electric motor. The driver includes a low-pass filter circuit and an inverter circuit. The low-pass filter circuit includes a common mode choke coil and a capacitor. The driver further includes a damping unit located at a position where magnetic field lines produced by the common mode choke coil generate eddy current.

Abstract: A vehicle inverter device is configured to convert DC power to AC power. The vehicle inverter device includes a circuit having switching elements and a noise reducer. The noise reducer is provided on an input side of the circuit and is configured to reduce common mode noise and normal mode noise contained in the DC power. The noise reducer is configured by a common mode choke coil, which includes a core, a first winding wound about a first winding portion of the core, and a second winding wound about a second winding portion of the core.