Parameter Identification of Pmsm Using Lsa Method

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract In the last 20 years Permanent Magnet Synchronous Machine (PMSM) are becoming more indispensable in many industrial applications. The PMSM is superior to both induction motor drives and DC motor drives because of the inherent advantages of these motors include high efficiency, high power factor, high power density, easy maintenance, fast dynamic response, and the minimum magnet cost because of low magnet weight requirement. Parameter identification is necessity to get good performance of PMSM drive. Here least square approximation is used find the parameters of motor such as stator inductance and resistance, viscous coefficient and inertia constant without any sensors and encoders. Many advantages of sensor less control such as reduced hardware complexity, low cost, reduced size, cable elimination, increased noise immunity, increased reliability and decreased maintenance.