Method for sensorless speed estimation of an asynchronous induction machine

摘要

The method involves measuring voltage applied on an asynchronous machine (11) based on a desired value for speed. A value for torque generating current and an internal torque (27) of the asynchronous machine are determined by the measured voltage. A load torque (26) working on the asynchronous machine is measured from a difference of the torque generating current from a field-oriented control (10) and an observer module (12). An actual speed of the asynchronous machine is measured by the load torque of a torque module and the internal torque of the observer module.