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In modern electrical drives all regulators are implemented in discrete-time domain. The design of current controller in the continuous time and its following discretization is a common and effective procedure as long as the ratio between the fundamental frequency and the sampling frequency remains sufficiently small. If this condition is violated, the performance of the closed loop system becomes...
To analyze the steady state equivalent circuit model of an induction motor to establish the equation that justify the use of a constant V/f speed control of open loop and closed loop control. The main objective is to maintain the speed at fixed reference. To investigate the control schemes for controlling induction machine, particularly the scalar control and vector control method and to evaluate...
Different techniques for the asymmetries in the rotor of asynchronous machines in closed-loop controlled drives have been developed; they usually need to monitor currents and speed. This paper investigates the detection of rotor asymmetries in field oriented controlled induction machines based only on the measured currents and without the measurement of the speed. The paper uses the indicator for...
The starting current is big and the torque is small when the motor begins to start with the nominal voltage .The discrete variable frequency method can solve the above two questions, at the same time brings the torque oscillation.The paper analyses the cause in detail, and then presents the solved method: the combination between discrete variable frequency method improvement and power factor closed...
This paper proposes to simulate the characteristics of wind turbine by PMSM (permanent magnet synchronous motor). On the aspects of wind turbine power-speed curve and torque-speed curve as well as PMSM open-loop and closed-loop control, the characteristics of wind turbine and PMSM are compared and analyzed. PMSM can simulate part of characteristics of wind turbine by open-loop frequency control, and...
This paper proposes a closed-loop control strategy to operate an off-the-shelf single-phase induction motor (IM) as a symmetrical two-phase IM. The proposed control strategy employs the slip frequency control technique to independently control the stator currents of both the main and auxiliary windings and make them follow a predefined sinusoidal waveform. Experimental results show that the proposed...
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