Automatic parameter measurement for permanent magnet synchronous motors compensating dead-time effect

This paper presents an automatic parameter measurement strategy for surface-mounted permanent magnet synchronous motors. The strategy consists of the DC test, single-phase AC test, and drive test. To automatically implement these tests, d-q axes currents in the stationary reference frame are appropriately controlled for each test using an inverter drive system. The advantage of the proposed strategy is that additional equipment such as rotary encoder and torque transducer are unnecessary. In addition, the dead-time effect of the inverter is compensated to improve accuracy of the calculated parameters. Parameter measurement results with the dead-time compensation are compared to the results without compensation.