Patent ID: 7084598
Filing Date: 2006-08-01
Classification: B60H,F04B,H02P

Abstract:
1. A driver of an electric compressor for driving a dc brush-less motor, said driver comprising: a power supply; and an inverter coupled to said power supply, wherein said driver operates such that an ac current having a sine-waveform is output from said inverter to the dc brush-less motor, wherein said driver drives a compressing mechanism that sucks fluid, and then compresses and discharges the fluid, wherein said driver controls the dc brush-less motor such that, during a start-up mode of driving the dc brush-less motor, a phase of the current of a winding of the dc brush-less motor is advanced with respect to a phase of the induction voltage generated in the winding in order to obtain sufficient torque to start driving the dc brush-less motor, wherein said driver controls the dc brush-less motor such that, immediately after the start-up mode is complete, the advancement of the phase of the current of the winding with respect to the phase of the induction voltage generated in the winding is reduced, and wherein the dc brush-less motor is an interior permanent magnet (IPM) motor.