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Aiming at the problem of large permanent magnet (PM) loss in traditional magnetic-field modulated brushless double-rotor machines (MFM-BDRMs), an MFM-BDRM with the same polarity of PM rotor is proposed, which can reduce PM loss, save PM material, improve the mechanical strength of PM rotor, and still keep good electromagnetic performance. First, the magnetic field distribution in the air gap, the...
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