Abstract
Two-level voltage source inverters with pulse width modulation (PWM) generate multiple carrier harmonics, thereby exciting high-frequency noise from the motor. Based on a special dual-branch three-phase permanent magnet synchronous motor (PMSM), a method that utilizes a known modified space vector PWM technique is proposed. This method is able to suppress unpleasant high-frequency vibration noise as well as acoustic noise more effectively than other methods. Vibration noise near the twice carrier frequency is eliminated, and PWM vibration noise around the carrier frequency is also reduced. In particular, vibration and acoustic noise at the twice carrier frequency are eliminated using a carrier phase-shift of 0.5π and the special winding structure of the dual-branch PMSM. The effectiveness of the proposed method is confirmed using detailed experimental results.
Highlights
Introduction of the proposed method2.1 Review of the modified Space vector pulse width modulation (SVPWM)Traditional seven-segment regular sampled SVPWM generates high-frequency harmonics near the carrier frequency and its multiples
It can be observed that Modified SVPWM (MSVPWM) decreases the carrier frequency harmonics by 17.4 dBA and has almost no effect on the twice carrier frequency harmonics
This paper presents an effective method combining the carrier phase-shift technique and MSVPWM for branch three-phase permanent magnet synchronous motor (PMSM), driven by paralleled voltage source inverters (VSIs) with coupled inductors, to eliminate high-frequency PWM vibration
Summary
Permanent magnet synchronous motors (PMSMs) are widely utilized for various applications and in various devices, such as electric vehicles, electric ship propulsion, aircraft, robotics, and space exploration[1]. Shifting carrier phase by π / 2 for two-segment three-phase PMSMs driven by interleaved paralleled VSIs without coupled inductors can largely reduce torque ripple in terms of even-order carrier frequency It has almost no effect on the reduction of vibration noise[5]. The total elimination of the twice carrier frequency is mainly dependent on the special structure of the motor rather than the coupled inductors, with which identical noise elimination cannot be achieved for other types of dual three-phase PMSMs driven by the same topology.
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