Patent ID: 8118564
Filing Date: 2012-02-21
Classification: F04C

Abstract:
1. A motor-driven compressor mounted to an engine of a vehicle comprising: a compression mechanism for compressing a refrigerant gas; an electric motor for driving the compression mechanism; an inverter assembly for converting direct-current power into polyphase alternating-current power to supply to the electric motor and controlling a rotational speed of the electric motor, wherein the inverter assembly comprises, as members thereof, a substrate having an electric circuit and an electronic component connected to the substrate; and an inverter chamber detachably accommodating the inverter assembly, wherein a vibration damping member is arranged in the inverter assembly, and the weight of the vibration damping member is determined such that a resonance frequency of the substrate, to which the vibration damping member is mounted, shifts at least to the frequency range with smaller amplitude of vibrations produced by the engine, wherein the vibration damping member is not in contact with the outer wall of the inverter chamber during stand-still of the compressor.