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Based on analysis of sources of the noise of switched reluctance motor (SRM), the paper puts forward methods to reduce noise in terms of torque ripple and phase change from the point of control view. In the low speed stage, phase current closed-loop segmented according to the sine and cosine curve, maintain a constant torque to reduce the torque ripple. Put forward soft turn-off method at the time...
This paper first analyzes the mechanism of vibration noise and torque ripple of the switched reluctance motor, and then studies methods of reducing torque ripple and noise reduction according to the principle. In order to reduce the noise, two-step phase conduction is proposed when motor starts. Meanwhile, each phase of the shutoff in advance will be replaced by reducing duty ratio slowly. In order...
The airgap magnetic field distribution and back-emf waveform are analyzed from the 3-D finite element models of the permanent magnet brushless DC (BLDC) motor with air-cored stator. The influence of magnet thickness, length of airgap and outer diameter of the rotor on the performance is investigated. It can be found that waveform of back-emf can be improved to reach flat roof width with 120° electrical...
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