Patent ID: 6481985
Filing Date: 2002-11-19
Classification: F04B

Abstract:
A motor-driven compressor that performs suction, compression, and discharge of a refrigerant comprising:a housing, wherein the housing includes four cylinder bores separated by equal angular intervals; pistons located in the cylinder bores, respectively; a drive shaft rotatably support by the housing; a swash plate, which is integrally rotated with the drive shaft; a transmission mechanism, which transmits the rotation of the swash plate to the pistons; and a motor, which drives the drive shaft, the motor including: stators, the number of which is the same as that of the cylinder bores, the respective stators being located at angular positions that match the angular positions of the respective cylinder bores; a rotor that is integrally rotated with the drive shaft; and magnets, the number of which is the same as that of the stators, the magnets being arranged at predetermined angular intervals about the periphery of the rotor, wherein the ratio of the discharge pressure to the suction pressure, when the discharge displacement of the compressor is maximum, is in a range of 2 to 4.5.