Dynamics Condition in 6/10 Switched Reluctance Motor with Noise Reduction by Selective Radial Force Harmonics Reduction

A method of ‘selective radial force harmonics reduction’ has been reported to be effective in reducing the vibration and acoustic noise in a three-phase 6/10 switched reluctance motor. The method selectively reduces specific radial force harmonics, which cause the major acoustic noise at respective harmonics. In 6/10 SRM, peaks of vibration and acoustic noise are found aside of multiples of third harmonic, such as 2, 4, 5, 7, and 8. By selective radial force harmonics reduction, the respective harmonics of vibration and acoustic noise are significantly lowered. In this paper, further verification of the proposed method is presented. The verification is carried out not only in a static condition, but also in a dynamics condition. Experiments are carried out to the three-phase 6/10 switched reluctance motor under conditions of a constant torque and a sudden change of torque, respectively. The effectiveness of the proposed method is verified. In static condition, a current from the proposed method generates low instantaneous vibration and acoustic noise harmonics, compared with a conventional excitation by a square current. In addition, the instantaneous vibration by the proposed method is also low when the load torque suddenly changes.