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In this paper, a new modulating signal for pulse width modulation (PWM) inverter system suitable for Permanent Magnet synchronous motor (PMSM) drive is proposed. The PMSM with the sinusoidal electromotive force (EMF) driven by the non-sinusoidal PWM voltage generates a torque ripple. And, the torque ripple is similarly generated in PMSM with the trapezoidal EMF driven in the sinusoidal PWM voltage. The new PWM strategy makes a great improvement of the characteristics in the three-phase PWM inverter for the PMSM. The proposed PWM strategy can reduce torque ripple more than sinusoidal PWM method. Although the output voltage waveform is a non-sinusoidal waveform, the motor driven by the proposed modulating signal produces approximately constant torque. By using the proposed modulating signal, the amplitude of the fundamental component is increased more than that of a conventional sine wave inverter. The usefulness of the proposal method was confirmed by a theoretical analysis, the simulation by modeling the system, and the experiments.

Modified Trapezoidal Modulating Signal suitable for PM Synchronous Motor Drives