Abstract: Aiming at the problem that the low-speed sensorless control system of interior permanent magnet

synchronous motor (IPMSM) based on high-frequency voltage signal injection method cannot identify the initial

position of the rotor, which causes the motor to start up difficultly, a starting strategy of IPMSM was proposed. In

this strategy, the high frequency pulse triangular wave voltage signal was injected into d,q axis, and the high

frequency response current was decomposed by Fourier transform to modulate the signal to obtain the angle error

information, and the Luenberger observer was used to estimate the rotor angle instead of the phase-locked loop

composed of a single PI regulator the rotor angle; the high-frequency pulsating triangle wave voltage signal injection method has the problem that the permanent magnet N/S pole cannot be identified, so this strategy used the twice rotor reservation method to simply and effectively locate the rotor to the position that can be accurately estimated by the position observer, without permanent magnet N/S pole judgment, the control process is simple and easy to operate. The Matlab/Simulink simulation results show that the proposed starting strategy is stable and effective.

    Key words: interior permanent magnet synchronous motor (IPMSM) ; sensorless; high-frequency pulsating

triangle wave voltage signal injection method; twice rotor reservation method