Abstract: An object is to provide a motor-driven compressor capable of reducing cost required when a failure occurs in part of components configuring an inverter device. A power substrate assembly 50 is removably fixed to a housing body 10 in an inverter accommodation chamber 13, and a control substrate assembly 70 and a filter circuit assembly 90 are removably fixed to a cover 30. Therefore, when the cover 30 is removed from the housing body 10, the power substrate assembly 50, the control substrate assembly 70, and the filter circuit assembly 90 can be independently removed from the housing body 10 or the cover 30, and new power substrate assembly 50, control substrate assembly 70, and filter circuit assembly 90 can be independently mounted on the housing body 10 or the cover 30.

Abstract: A capacitor unit is integrally provided with: a capacitor main body; a pair of bus bars that are connected to a pair of corresponding electrodes of the capacitor main body; and a casing that internally contains the capacitor main body and the bus bars and is made of resin. The bus bars are each provided with an input terminal on a first end side to which a connection terminal of a high-voltage cable for DC power is connected, while being each provided with an output terminal on a second end side to which an inverter substrate is connected.

Abstract: A substrate includes a substrate body, a flux coating portion which is coated with flux promoting solder fluidity on a surface of the substrate body, a conduction portion which is disposed on the surface of the substrate body to be separated from the flux coating portion and is conductive, and a silk portion which is disposed between the flux coating portion and the conduction portion on the surface of the substrate body and is provided by silk printing.

Abstract: An electric wire lead-in part structure (15) includes: a conductor insertion hole (16) formed through a wall part (2Ca) of an inverter accommodating chamber; a conductor member (17) made of an electrically conductive material and inserted into the conductor insertion hole (16) in a waterproof manner and also, electrically conducted to the conductor insertion hole (16) and holding a power supply cable (11) passed therethrough; a shield grounding part (50) for electrically conducting a shield part (45) of the power supply cable (11) to the conductor member (17) at a position where the conductor member (17) is provided; and an electric wire waterproofing part (40) for waterproofing a gap between the conductor member (17) and the power supply cable (11).

Abstract: A circuit assembly (20) provided with: a circuit board (21); a capacitor (30) connected to the circuit board (21); and a circuit casing (20C) configured to house the circuit board (21) and the capacitor (30). The capacitor (30) is provided with: a component body (31) including a pair of connection terminals (32A and 33A) to be fixed to the circuit board (21); and a first fixing unit (41) and a second fixing unit (42) configured to fix the component body (31) to the circuit casing (20C) at both sides. The connection terminals (32A and 33A) are disposed with a fixed line (L1) connecting the first fixing unit (41) and the second fixing unit (42) interposed therebetween, and both of the pair of connection terminals (32A and 33A) protrudes sideward from the component body (31) between a first surface of the circuit board (21) and the circuit casing (20C), and extends toward the circuit board (21).

Abstract: A capacitor unit is integrally provided with: a capacitor main body; a pair of bus bars that are connected to a pair of corresponding electrodes of the capacitor main body; and a casing that internally contains the capacitor main body and the bus bars and is made of resin. The bus bars are each provided with an input terminal on a first end side to which a connection terminal of a high-voltage cable for DC power is connected, while being each provided with an output terminal on a second end side to which an inverter substrate is connected.

Abstract: An affixing structure that reduces costs and reduces the risk of vibration causing damage or the like to electrical connection terminals on an electronic component affixed to a circuit board is provided. In the affixing structure, which is affixed to a circuit board (21) via a plurality of lead frames (55) that are part of a transformer (50), at least one second side wall perpendicular to a first side wall where the lead frames (55) are arranged is adhesively supported on the circuit board (21) by a support (60). The height (H3) of the part of the support (60) in contact with the transformer (50) is greater than or equal to the height (H2) of the center of gravity of the electronic component, and the length (L) of the support (60) in the direction of the first side wall is greater than or equal to the height (H3).

Abstract: This electric compressor includes a compressor which rotates around an axis to compress a fluid, a motor which rotatably drives the compressor around the axis, and a control unit having a first component and a second component and controlling current supply to the motor during driving using the first component and the second component. An allowable current when the first component and the second component are exposed to the same temperature is set to be smaller in the second component than in the first component. The second component is disposed at a place in which cooling capability is greater than that of the first component so that allowable power of the second component at rated use is set to be greater than an allowable power of the first component.

Abstract: Provided is an air conditioning apparatus that is capable of suppressing increases in volume and cost of the apparatus and performing more suitable overheating protection. An electric compressor is an inverter-integrated electric compressor (10) integrally including a compressor (5), an electric motor (6) that drives the compressor (5), and an inverter (7) including a temperature sensor (11) that detects the temperature in the vicinity of a semiconductor switching device, wherein a controller (3) estimates a discharge temperature of the compressor (5) on the basis of a correlation of respective pressure loading characteristics for the detected temperature of the inverter (7), for the rotational speed of the compressor (5), and for the motive force of the compressor (5) in a refrigerating cycle (2).

Abstract: Provided is an air conditioning apparatus that is capable of suppressing increases in volume and cost of the apparatus and performing more suitable overheating protection. An electric compressor is an inverter-integrated electric compressor integrally including a compressor, an electric motor that drives the compressor, and an inverter including a temperature sensor that detects the temperature in the vicinity of a semiconductor switching device, wherein a controller estimates a discharge temperature of the compressor on the basis of a correlation of respective pressure loading characteristics for the detected temperature of the inverter, for the rotational speed of the compressor, and for the motive force of the compressor in a refrigerating cycle.

Abstract: In an inverter control apparatus, a phase current calculation section calculates each of phase currents flowing into a motor by using measurement results of a current sensor, and a voltage command generation section calculates three-phase voltage commands by using each of the estimated phase currents. A command modulation section compares the phase voltage commands with each other, to specify a full-on phase or a full-off phase on the basis of the comparison result and then to set the voltage command of the specified phase to a full-on voltage or a full-off voltage, and offsets the voltage commands of the other two phases according to the full-on voltage or the full-off voltage to modulate the voltage commands into voltage commands allowing the line voltage between the other two phases to be kept constant.

Abstract: In an inverter control apparatus, a phase current calculation section calculates each of phase currents flowing into a motor by using measurement results of a current sensor, and a voltage command generation section calculates three-phase voltage commands by using each of the estimated phase currents. A command modulation section compares the phase voltage commands with each other, to specify a full-on phase or a full-off phase on the basis of the comparison result and then to set the voltage command of the specified phase to a full-on voltage or a full-off voltage, and offsets the voltage commands of the other two phases according to the full-on voltage or the full-off voltage to modulate the voltage commands into voltage commands allowing the line voltage between the other two phases to be kept constant.

Abstract: An object of the present invention is to achieve stable inverter control by means of current detection using one current sensor in all of periods in which overmodulation control is performed. An inverter controller includes a ?-axis current calculation section that holds, in advance, a ?-axis current arithmetic expression including a direct current as a parameter, and calculates a ?-axis current using a direct current detected by a current sensor for the ?-axis current arithmetic expression.

Abstract: This invention provides an affixing structure that reduces costs and makes it possible to lower the risk of vibration causing damage or the like to electrical connection terminals on an electronic component affixed to a circuit board. The affixing structure, which is affixed to a circuit board (21) via a plurality of lead frames (55) that are part of a transformer (50), is characterized in that at least one second side wall that is perpendicular to a first side wall where the lead frames (55) are arranged is adhesively supported on the circuit board (21) by a support (60), the height (H3) of the part of the support (60) in contact with the transformer (50) is greater than or equal to the height (H2) of the center of gravity of the electronic component, and the length (L) of the support (60) in the direction of the first side wall is greater than or equal to the aforementioned height (H3).

Abstract: To suppress a ripple contained in current flowing into a DC power supply during one-pulse control in a motor drive apparatus receiving electric power from the DC power supply. A motor drive apparatus 1 includes an inverter control device (10) provided with a one-pulse control mode in which, during one electrical angle cycle, a positive rectangular pulse voltage and a negative rectangular pulse voltage are applied, as gate drive signals, to a switching element corresponding to each phase. When performing the one-pulse control mode, the inverter control device (10) gradually increases or reduces a duty in a predetermined phase angle width at rising and falling edges of the rectangular wave voltage.

Abstract: Provided are a circuit assembly including a circuit component fixing structure capable of preventing damage to a fixing portion and a connection terminal caused by vibrations, and a vehicular electric compressor. The circuit assembly includes: a circuit board; a circuit component connected to the circuit board; and a circuit casing housing both the circuit board and the circuit component. The circuit component includes a component body disposed facing the circuit board inside the circuit casing, a connection terminal directly fixed to the circuit board, and a first fixing portion and a second fixing portion that are fixed to the circuit casing around the component body. In a direction orthogonal to the circuit board, the first fixing portion is positioned on a side of the circuit board with respect to the center of gravity of the circuit component, and the second fixing portion is positioned on a side away from the circuit board with respect to the center of gravity.

Abstract: A control circuit board (25) configuring an inverter (21) serves as a thermally-conductive substrate. One surface of the control circuit board (25) is installed in a heat transferable manner on a heat-dissipating planar part (31) disposed on a housing (2), while heat-producing electrical components (39) are disposed in a heat transferable manner on the other surface of the control circuit board (25). The control circuit board (25) includes a substrate body (41) constituted of an insulator, and heat-conducting through members (42) constituted of a good thermal conductor filled through in a thickness direction of the substrate body (41). One end of each of the heat-conducting through members (42) is disposed in a heat transferable manner on the heat-dissipating planar part (31), and the electrical component (39) is disposed in a heat transferable manner on the other end.

Abstract: Provided is an inverter-integrated electric compressor in which the layout of a wiring path connected to an IPM is optimized, the wiring path is simplified, and the noise interference due to disturbance is suppressed, thereby improving the controllability. In an inverter-integrated electric compressor in which an inverter box is provided on the outer periphery of a housing accommodating a compressor and a motor, the inverter box integrally accommodating an inverter device, the inverter device includes an IPM constituting an inverter circuit, and UVW output terminals arranged on one side of the IPM are disposed, in the inverter box, so as to face a glass-sealed terminal that applies power from the inverter device to the motor.

Abstract: To suppress a ripple contained in current flowing into a DC power supply during one-pulse control in a motor drive apparatus receiving electric power from the DC power supply. A motor drive apparatus 1 includes an inverter control device (10) provided with a one-pulse control mode in which, during one electrical angle cycle, a positive rectangular pulse voltage and a negative rectangular pulse voltage are applied, as gate drive signals, to a switching element corresponding to each phase. When performing the one-pulse control mode, the inverter control device (10) gradually increases or reduces a duty in a predetermined phase angle width at rising and falling edges of the rectangular wave voltage.

Abstract: An object is to provide an inverter module that can ensure satisfactory anti-vibration strength, moisture resistance, and isolation for each of the upper and lower boards of the inverter module and that can reduce the weight and cost, and to provide an integrated-inverter electric compressor. In an inverter module (21) in which a power system board (23) and a control board (31) are integrated via a resin case (22), the inverter module (21) is configured such that the power system board (23), on which a semiconductor switching device (24) is mounted, is provided at the lower part of the resin case (22) and the control board (31), on which a control-and-communication circuit is mounted, is provided thereabove.