Magnetic field waveform in stator yoke and teeth has twofundamental frequencies, i.e. fp and fc. Due to operationaround natural speed, the CW voltage, current and frequency,are lower than those for the PW [9]. Hence, the timeoscillations of Pp pole pairs component is superimposed on thelower frequency waveform with Pc pole pairs. Fig. 3(a) showsthe magnetic field waveform in a stator tooth of D-180prototype BDFIG (see Appendix), where oscillations with twofrequencies are evident.
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