Origin of resonance noise and analysis of randomising turn‐on angle method in switched reluctance motor

Radial vibration and torque ripple are the most two important factors to acoustic noise, especially when resonance is excited. This study focuses on radial vibration, which is composed of vibration impulse and fundamental vibration. The respective influence of the two components to resonance noise is analysed. It is experimentally demonstrated that fundamental vibration is more significant to resonance noise compared with vibration impulse. Accordingly, based on the already proposed randomising turn‐on angle method, the reduction effect of the method is analysed in detail using different control parameters like different variation range of turn‐on angle and different overlapping. The resonance noise is substantially reduced, which verifies the effectiveness of the randomising turn‐on angle. In addition, it is found that the reduction effect is almost the same by different control parameters, which shows the flexibility of the method.