The Identification Method of Electrical Parameters of PM Motor Without Current Sensor and its Application to Servo System

Abstract

It is very important to identify the electrical parameters accurately for the current control system, the current simulator and some of sensor-less system. Generally, the electrical parameters of PM motor are identified by using the signal of motor voltage and motor current. However, current seneor has indivisual difference. This paper proposes a new identification method of both the main flux and the electrical time constant of PM motor without current sensor.
Moreover, in order to confirm the validity of this method, this paper describes self tuning of a current control system and a current simulator as an application example to a servo system, and shows an experiment result.