A position Sensor-less Control of PM Motor

摘要

To achieve a high efficiency drive of PM motors, the information of the motor axis is needed. But, not only the cost-performance and machine size but also the restrict of circumstance like as chemical vapor, magnetci noise and mechanical vibration do not allow to use position sensor. We will propose a poistion estimation method from the dynamic equations of the fixed two phase currents. We assumed that the electic position angle and electric angular speed to not vary each PWM sampling period. The harmonic noise in estimated electric angle was eliminated using Newton's Method Applying the proposed technique we cintrolled a PM motor under speed change fro m50rpm to 100rpm.