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| Analytical Calculation for Air Gap Flux Density of Multi-Pole Permanent Magnetic Brushless DC Motor |
| Meng Guangwei, Li Huaishu |
| Naval University of Engineering Wuhan 430033 China |
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Abstract In this paper, based on equivalent surface current method, analytical formulas for air gap radial flux density of multi-pole brushless DC motor (BLDCM) in stator inner surface is obtained, when magnetic tile model magnetized in parallel is different centers and different radii. By means of comparison of the detecting back EMF waveform of the multi-phase prototype motor, the analytical formula is effective and accurate. The analytical formula of air gap flux density generated by permanent magnet whose shape is different radii and centres is deduced, solving the problem that flat-roofed back EMF waveform is difficult to obtain by magnetic tile model magnetized in parallel, improving the precision of air gap flux density and parameter calculation. All these provide important theory basis for accurately designing and analysing about multi-pole BLDCM.
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Received: 03 November 2010
Published: 07 March 2014
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2011, Vol. 26 
