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In this paper, a segment phase-shifted carrier PWM method is proposed. According to the sector, the modulation wave can be discontinuous with different zero sequence signal injected and the carrier wave are phase shifted, which is different from conventional SVPWM. Using this technique, the peak-to-peak value of the common-mode voltage in one PWM cycle can be reduced to one third of the DC bus voltage...
Two methods for initial rotor position estimation of interior permanent magnet synchronous motor (IPMSM) are developed based on di/dt principle in this paper. Pulse voltage vectors at different electrical angles are applied on the motor, and the di/dt of the motor are calculated to get the information of the rotor position. Fourier analysis is used in method I in order to get rid of the cogging effect...
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