Patent ID: 7932691
Filing Date: 2011-04-26
Classification: H02P

Abstract:
1. A controller configured to generate torque command currents controlling a permanent magnet alternating current (AC) motor, the controller comprising: a current ripple detector configured to detect current ripple in stator currents of the permanent magnet AC motor and to generate a current ripple signal in response thereto; a startup torque command module configured to modify a predetermined startup torque command in response to the current ripple signal to generate a torque command, the start up torque command module being coupled to the current ripple detector; a torque-to-current converter configured to convert the torque command to the torque command currents; and a first startup switch controller configured to couple the startup torque command module to the torque-to-current converter after startup of the permanent magnet AC motor while a detected speed of the permanent magnet AC motor is less than a predetermined speed.