Random Asymmetric Carrier PWM Method for PMSM Vibration Reduction

Abstract

The underwater noise can be caused by the radial electromagnetic vibration of permanent magnet synchronous motor (PMSM) for electric propulsion. The difficulty in decreasing the underwater noise is not only the high-frequency but also low-frequency vibration reduction. This paper proposes a novel random asymmetric carrier pulse width modulation (RACPWM) method for PMSM vibration reduction in the whole frequency range. Instead of the conventional symmetric triangular carrier PWM, the asymmetric carrier PWM (ACPWM) is used to decrease the low-frequency phase current harmonics and the associated low-frequency vibration. Meanwhile, in order to suppress the high-frequency vibration, the RACPWM control based on the amplitude randomization of the sawtooth carrier is further presented to reduce the high-frequency phase current harmonics. Moreover, the RACPWM is equivalent to the random slope ACPWM in view of the output signals. Furthermore, without the need of any additional circuits in the drive, the presented method is simple to implement by software. Simulation and experimental results show that the proposed RACPWM method can effectively reduce both the low-frequency and the high-frequency vibration. INDEX TERMS Permanent magnet synchronous motor (PMSM), asymmetric carrier, sawtooth carrier, vibration reduction, underwater noise, current harmonics.

Effect of Electromagnetic Force Caused by PMSM on the Vibration/Noise of Reciprocating Compressors

“…Second, studies on noise/vibration reduction of PMSM drives and electromagnetic noise/vibration in the carrier frequency domain according to DC voltage fluctuations were conducted [18], [19]. Also introduces the PWM method and control algorithm for noise/vibration reduction in PMSM [20], [21]. However, no study was conducted on the effect of motor noise/vibration on the noise/vibration of the reciprocating compressor.…”

Novel Variable Switching Frequency PWM Strategy for a SiC-MOSFET-Based Electric Vehicle Inverter to Increase Battery Usage Time

“…Meanwhile, there has been recent active research on the VSF pulse width modulation (VSFPWM) strategy to improve the inverter's efficiency, based on various theoretical backgrounds. Examples of published studies include a VSF control method that ensures only minimum control precision based on the real-time rotational speed (revolutions per minute) of the motor [13], a VSF control method for reducing the phase current ripple applied to the load and minimizing the switching frequency [14]- [20], and a control method with random variation of the switching frequency to reduce the peak magnitude of the load phase current [21], [22]. The various methods employed in previously published studies have been effective at reducing switching loss and improving the total harmonic distortion (THD) of the phase current.…”

Analysis and Reduction of Slot Frequency Vibration of PMSMs With the Force-Harmonic Coupling Model Considering Phase Angle Characteristic

“…The permanent-magnet synchronous machines (PMSMs) are the most attractive candidates for the use as the power sources for underwater vehicles and contribute to the performance of the power system due to its ease of fabrication, inherent high efficiency, and high efficiency [1], [2]. However, as an essential performance for the underwater vehicles, concealment is vulnerable to low-frequency vibration and noise caused by PMSMs [3], [4]. In the low frequency domain, the slot frequency vibration plays a significant vibroacoustic role for PMSMs, the frequency of which is equal to the multiplication of slot number and mechanical rotation frequency [5], [6].…”