Abstract
In this paper, a novel sensorless control strategy with the injection of a high-frequency pulsating sinusoidal voltage into a rotating reference frame for a surface-mounted permanent magnet synchronous motor (SPMSM) is proposed. Conventional schemes may face the problems of applying to the motor with no obvious salient pole effect, and the effect of filter on the bandwidth of the system. Different from the conventional schemes, the new proposed strategy injects a high-frequency pulsating sinusoidal voltage signal is injected into the estimate d-q rotating reference frame, and the rotor position information is obtained from the response of injected high-frequency current signal in the $\alpha $ - $\beta $ stationary reference frame other than the d-q rotating reference frame,which can avoid failure of applying to the SPMSM with no obvious salient pole effect. With this approach, band-pass filter, which is necessary in the conventional sensorless control, is removed to simplify the control structure and improve the system dynamic control performance. Therefore, this paper proposes a simple structure, which modulates the high-frequency current signal directly and only passes through the low-pass filter to obtain the estimated rotor position angle. Finally, the feasibility of the improved high-frequency pulsating sinusoidal voltage injection control method is verified by simulation and experiment.
Highlights
Permanent magnet synchronous motor (PMSM) has become the best choice for many industrial applications because of its high efficiency and high torque density compared with induction machines, especially in the field of advanced manufacturing and electric drive [1]–[5]
A high-frequency pulsating sinusoidal voltage signal having a frequency of 900 Hz and an amplitude of 5 V is injected on the estimated d-axis, and rotor position information is extracted from the high-frequency current response of the two-phase stationary reference frame
IMPROVED HIGH-FREQUENCY PULSATING SINUSOIDAL VOLTAGE INJECTION METHOD FOR CURRENT SIGNAL PROCESSING In the improved experimental method, the interruption frequency of the system is set as 10 kHz
Summary
Permanent magnet synchronous motor (PMSM) has become the best choice for many industrial applications because of its high efficiency and high torque density compared with induction machines, especially in the field of advanced manufacturing and electric drive [1]–[5]. A. ROTOR POSITION EXTRACTION The high-frequency pulsating sinusoidal voltage is injected into the d -axis of the estimated rotating reference frame, and the angle signal is extracted from the high-frequency current response of the α-β two-phase stationary reference frame. In position-sensorless control using high-frequency pulsating sinusoidal voltage injection method, the current vector iαβ in two-phase stationary reference frame includes the fundamental current vector iαβb, the high-frequency current component iαβh, and the high order harmonic current vector iαβx caused by the PWM switching signal.
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