Permanent magnet synchronous motor d-axis inductance and q-axis inductance measuring method

The invention relates to a permanent magnet synchronous motor d-axis inductance and q-axis inductance measuring method. According to the method, a test device is mainly composed of a prime mover controlled by an inverter, a tested permanent magnet synchronous motor and a three-phase symmetrical resistive load; the prime mover is connected with the tested permanent magnet synchronous motor through a coupling; and a switching switch is controlled, so that switching between no-load operation and resistive load operation of the permanent magnet synchronous motor can be realized. In a testing process, the prime mover drives the permanent magnet synchronous motor to operate as a power generator, and the d-axis inductance and q-axis inductance of the permanent magnet synchronous motor can be obtained according to relevant parameters obtained from a no-load test and a load test.