Abstract
Aiming at the underwater acoustical directivity of permanent magnet (PM) motor, theoretical and numerical simulation methods are used to study radial force characteristics of fractional slot motor, when ideal sine wave power and containing harmonic current power supplied.It is found that radial force of the fractional slot PM motor with ideal sinusoidal phase current periodically appears after some teeth. When phase current contains noninterfering harmonic current, the radial force is aperiodic in time domain, but it is still periodic in frequency domain. When harmonic current in phase current is interferential, the radial force is aperiodic in both time domain and frequency domain. The aperiodic law is verified by an experiment in which phase current containing interfering harmonic current caused by pulse width modulation (PWM).The radial force is the driving source of electromagnetic vibration and noise. Different forces leads to different vibrations on tooth. The aperiodic law of radial force can explain the acoustic directivity.
| Original language | English |
|---|---|
| Pages (from-to) | 33-40 |
| Number of pages | 8 |
| Journal | Dianji yu Kongzhi Xuebao/Electric Machines and Control |
| Volume | 22 |
| Issue number | 2 |
| DOIs | |
| State | Published - 1 Feb 2018 |
| Externally published | Yes |
Keywords
- Electromagnetic force
- Electromagnetic vibration and noise
- Harmonic interference
- PM motors
- Radial force
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