DEVICE FOR SENSING MAGNETIC-POLE POSITION OF MOTOR

摘要

PURPOSE: To reduce the controller-cost of a motor and solve such problems as functional deterioration, defective wiring and disconnection which are accompanied by the wirings for obtaining the power supplies and outputs of ordinary sensors, by sensing the magnetic-pole position of the motor having an electric salient-pole quality without the use of an ordinary sensor. CONSTITUTION: A device for sensing a magnetic-pole position which is adapted to the system for driving such a motor having an electric salient-pole quality as a synchronous motor by a voltage PWM inverter. The device has means 23 for sensing synchronously with the switching of its inverter the variation parts of both the output-current ripple and the time-integration value of the output voltage of its inverter in each switching zone of the PWM control of its inverter. The device further has magnetic-pole position sensing means 10 for sensing the magnetic-pole position of the motor based on a current.volt age equation of the motor which is observed from the stator coordinate of the motor while using the variation parts of both the output-current ripple and the time-integration value of the output voltage of its inverter.