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:
There is provided an integrated electric compressor that is improved in reliability. Bus bar connection is employed for electrical connection between a power board 16 and the power source side and between the power board 16 and the motor side, and welding is employed for joining a bus bar to a capacitor 13 and a reactor 14, for joining board-side terminal parts of the bus bar to PN terminals 20a and 20b, and for joining UVW terminals 25a, 25b and 25c to housing-side terminals 28a, 28b and 28c. By employing resistance welding for the welding, the terminals can be joined to each other with stabilized quality. Further, since flat joint plates are provided on one end side of the housing-side terminals 28a, 28b and 28c, and the UVW terminals 25a, 25b and 25c are welded thereto, reliable joints between terminals can also be attained in these portions.
Abstract:
The present invention has an object to detect a three-phase AC motor current with high accuracy only with DC input current measuring means to a three-phase PWM inverter, and reduce resonance of a DC power supply by a ripple current in driving an AC motor with a DC current via a three-phase PWM inverter. A carrier wave Cry_e earlier than that of a V phase is used to sample a U phase and a carrier wave Cry_l always later than that of the V phase is used to sample a W phase. Thus, a sampling time sufficiently longer than an interval Ts of the carrier waves Cry_e, Cry_m and Cry_l can be ensured, and the current can be easily detected.
Abstract:
There is provided a control device of a permanent-magnet type synchronous motor that sets a synchronous operation current at start-up in response to a current limiting value determined from the temperature of an inverter that supplies three-phase power to the permanent-magnet type synchronous motor, that monitors an output voltage or an output current of the inverter during a rotation stabilizing period after start-up, and that updates the synchronous operation current using this output voltage or output current.
Abstract:
The present invention has an object to provide an on-vehicle air conditioner that can prevent breakage or the like caused by applying a high voltage. In an inverter system 20 that controls an operation of a motor 30 of a compressor for the on-vehicle air conditioner, a motor control microcomputer 24 operates by converting a voltage supplied from an on-vehicle battery power source 50 into a low voltage. Thus, the motor control microcomputer 24 is operated to perform failure diagnosis of a high voltage circuit Cb without a high voltage power source 40 being turned on. The failure diagnosis can be performed without power being supplied from the high voltage power source 40 to the high voltage circuit Cb, thereby preventing the high voltage circuit Cb from being broken by applying the high voltage even when there is some failure in the high voltage circuit Cb.
Abstract:
There is provided an apparatus for controlling an electric compressor, which can actuate the electric compressor rapidly through a simpler and lower-cost configuration while achieving reduction in weight, cost, and assembling time of the electric compressor. In the case where a pressure difference between the inlet side and the outlet side of the compressor body is present when a motor of the electric compressor is actuated, the motor is actuated at a number of revolutions lower than that in the normal mode. Thereby, even if a refrigerant has been liquefied on the outlet side of the compressor body, for example, the motor can be actuated by performing such action as to push out the liquefied refrigerant. In this case, the number of revolutions of the motor is increased by being changed stepwise or linearly, by which the number of revolutions of the motor is caused to reach a required number of revolutions as early as possible while surely performing the actuation.
Abstract:
An integrated-inverter electric compressor whose grounding effect and grounding reliability are increased by reliably grounding an inverter device to a housing and in which the size the inverter device are reduced by simplifying the grounding structure is provided. The integrated-inverter electric compressor includes an inverter device provided in an inverter container on the outer circumference of a housing. The inverter device includes an inverter module formed by integrating a power-related metal substrate and a resin case and is provided with a control-related substrate on the upper surface of the inverter module; the resin case is integrated with mounting legs provided at a plurality of locations on the circumference; the mounting legs are grounded to the power-related metal substrate and the control-related substrate; and grounding terminals, which frame-ground the substrates to the housing, are insert-molded in such a manner that the grounding terminals are securable to the inverter container with screws.
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 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:
There is provided an electric compressor capable of being actuated rapidly. During the time when the operation of an automotive air conditioner is stopping, by heating a motor 12, a refrigerant on the outlet side 11b of a compressor body 11 is heated. Thereby, the temperature of refrigerant on the outlet side 11b is raised, and the refrigerant is prevented from being liquefied on the outlet side 11b of the compressor body 11, by which the automotive air conditioner can be actuated rapidly. Besides, by rotating the motor 12 at the number of revolutions lower than that at the time of normal operation, the refrigerant liquefied on the outlet side lib of the compressor body 11 may be pushed out.