Current Waveform for Noise Reduction of a Switched Reluctance Motor Under Magnetically Saturated Condition

A novel method is proposed to derive the current waveform to reduce noise and vibration of a switched reluctance motor in a magnetically saturated region. Principle of noise and vibration reduction is based on reducing the variation of the radial force sum. To realize the minimum variation in the sum of the radial forces, radial force expression has been derived. In a magnetically saturated region, radial force expression is approximated with Fourier series with parameters as a function of current. With the proper approximation of radial force, the current waveform is derived to minimize the variation of the radial force sum. The proposed current waveform consists of dc, fundamental, second, and third harmonic components. Finite-element analysis and experiment result are included to show the validity of the proposed method.