A five-phase IM vector control system including 3rd current harmonics component

In this paper an effective five-phase induction motor (IM) and drive methods are proposed. Due to the additional degrees of freedom, five-phase IM drive presents unique characteristics. One of them is the ability of enhancing the torque producing capability of the motor. Also five-phase motor drives possess many other advantages compared to the traditional three-phase motor drives. Such as, reducing the amplitude and increasing of frequency of torque pulsation, reducing amplitude of current per phase without increasing the voltage per phase and increasing the reliability. In order to maximize the torque per ampere, the proposed motor has concentrated windings and the produced back-EMF is almost trapezoidal, and the motor is supplied with the combined sinusoidal plus third harmonic of currents. For presenting the superior performance of the proposed five-phase IM, the motors are also analyzed on synchronously rotating reference frame. To supply trapezoidal current waveform and exclude effect of 3rd harmonic current, new control stratagem is proposed. Experimental results clearly demonstrated a better steady state characteristic with proposed control method of a five-phase induction motor.