Patent ID: 9243638
Filing Date: 2016-01-26
CPC Classification: F04C,H02K

Claim Text:
1. A motor-driven compressor comprising: a compression unit; an electric motor including a rotation shaft coupled to the compression unit, a rotor rotated integrally with the rotation shaft and including a rotor core, and a stator surrounding the rotor, wherein rotation of the rotation shaft drives the compression unit, the stator includes a stator core, which is provided with teeth, and a coil, which is arranged in a slot between the teeth, the coil includes a first coil end, which is located at a compression unit side, and a second coil end, which is located at an opposite side of the compression unit side, the rotor core includes a plurality of refrigerant passages extending through the rotor core along an axial direction of the rotation shaft, each of the refrigerant passages includes a first opening that opens in the compression unit side, and the first opening includes a first radially outer region located at an outer side of the first opening in the radial direction of the rotation shaft, wherein a hypothetical circle in the radial direction of the rotation shaft lies along outermost portions of the refrigerant passages; a motor drive circuit that drives the electric motor; a housing that accommodates the electric motor and the compression unit, wherein the stator is fixed to an inner surface of the housing, the housing has an interior including a first region in which the first coil end is located and a second region in which the second coil end is located, the first region and the second region are in communication through the refrigerant passage of the rotor core, and the housing includes a suction port connected to an external refrigerant circuit, wherein the suction port opens in the second region; and a first end plate arranged on a first region side end of the rotor core, wherein the first end plate includes a first communication port, wherein an outer diameter of the first communication port is an inner diameter of the first end plate, wherein the first region and the refrigerant passages are in communication through the first opening and the first communication port, and the inner diameter of the first end plate is smaller than a diameter of the hypothetical circle so that the first radially outer region is covered by the first end plate.