Continuous Operation Control of PMSM in the case of DC Power Supply Loss

Abstract

In the PMSM sensorless drive system, when the power supply is lost, the position of rotor cannot be estimated by the usual control method. And the system stops due to the Filter Condenser (FC) voltage or the rotation speed decrease. To solve this problem, we proposed effective control methods at the interruption of power supply. There are three methods depending on inertial loads of the application and duration of the power interruption. In this paper, we explain the structure and characteristics of the three control methods and compare them. And we propose an appropriate continuous operation control depending on application and usage environment.