Transient Performance Analysis of Permanent Magnet Synchronous Motors Using the Finite Element Method

This paper describes the computational method of the transient performance for permanent magnet synchronous motors using the finite element method. The new method is proposed, where the mechanical, electromagnetic and electric circuit equations for the permanent magnet machines are transformed into the discrete equations by using a time-stepping finite element technique. First, the position of the rotor at a certain time is determined by solving the mechanical equation. Next, the electromagnetic and electric circuit equations are solved directly by using the finite element method. In this paper, no load current is obtained from this analysis. An agreement between calculated and measured values for no load current is good. Therefore, it is clear that this method is reasonable.