Abstract
Keywords:
Low voltage, Large current, IPMSM, Sensorless control, Dead-time compensation strategy
Abstract:
Interior Permanent Magnet Synchronous Motors (IPMSM) have been widely used for their high performance
To control IPMSM, knowledge of rotor position and velocity are necessary, so a position and velocity sensor has to be connected the motor. But it has many problems. For that reason, many sensorless control algorithms have been developed for permanent magnet motors. Usually, those algorithms are using a motor that is supplied with over 100 [V]. Firstly, we clarify some dead-time compensation methods make position estimation error in various sensorless control methods.
Secondary to solve this problem, new dead-time compensation strategy is proposed. It compensates with state value on dq-frame, so that voltage and current that compensated by proposed strategy are less pulsation than compensated by basic strategy. Experimental results showed that the sensorless control system produce position estimation, which is used proposed compensation strategy is less position estimation error than 1/3 of which is used basic compensation strategy. The result is same which without position sensor. Those experiments show proposed dead-time compensation strategy is available for low voltage motors.