In order to obtain the dq inductance of permanent magnet synchronous motor (PMSM) accurately, a method combining analytical calculation and experimental measurement is proposed, which is more universal and more accurate than traditional methods. In this paper, the main inductance and leakage inductances of PMSM are deduced by analytical method, then the dq inductance of nine-phase PMSM is calculated by programming. The extremum method is used for experimental measurement, that is, the maximum and minimum of equivalent impedance between phases are measured by impedance measuring instrument, and the dq inductance can be obtained through the derived relationship. The results measured by extremum method are compared with those calculated by the analytical method. The experimental results are highly consistent with the calculated results, which verifies the accuracy of the two methods.
 

permanent magnet synchronous motor; dq inductance; stator leakage inductance; extremum method