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The integral sliding mode variable structure control (ISMVSC)has many characteristics such as fast response,small overshoot, strong robustness and antidisturb- ance, so it is suitable for permanent magnet synchronous motor (PMSM)which is a high-order, nonlinear and strong coupling multi-variant system. The ISMVSC strategy is introduced into the vector control system of the PMSM, and the system is...
The mathematical models of five-phase permanent magnet synchronous motor (PMSM) in abc frame and alphabeta frame are established, and the relationships between the torque and fundamental components, loss and harmonic components are revealed. To suppress the high third harmonic current appeared in five-phase machine especially, a novel space vector pulse width modulation (SVPWM) method which has a...
This paper presents a comprehensive research on torque ripples of brushless dc motor drive in conduction region based on the mathematical models.The phenomenon of torque ripples of conduction exists because of diode freewheeling happened under the conventional PWM schemes. Through theoretical and mathematical analysis, a new method for reducing the torque ripple in brushless dc motors with a single...
In this paper, a new direct torque control (DTC) method of multi-phase induction motor for electrical propulsion is proposed. The classical DTC method for three phase induction motor uses the hysteresis-loop controller based on the switching table, in which the stator flux and torque ripple exists obviously. The new DTC method mentioned above applies the space vector PWM (SVPWM), which can achieve...
This paper presents a comprehensive research on torque ripples of brushless dc motor drive in conduction region based on the mathematical models.The phenomenon of torque ripples of conduction exists because of diode freewheeling happened under the conventional PWM schemes.Through theoretical and mathematical analysis, A new method for reducing the torque ripple in brushless dc motors with a single...
The developments of electric propulsion technique need high power propulsion motor testing system, in which propeller load simulation is an important part. In this paper, a new doubly-fed machine load system is presented to simulate the stable and dynamical properties of marine propeller operating in different conditions. By changing the magnitude and phase of the rotor voltage, the input torque of...
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