| Abstract |
This paper introduces a method of rotor impedance control. By using controlled
capacitor/inductor connected in series in the rotor circuit. The proposed system can be operate
as speed control system or soft starting system to limit the starting current of the motor. An
approach to a three MOSFETs–based a rotor circuit of induction motor is presented. The
experimental realization of the drive posed some serious problems, notably with regard to the
successful driving pulses of MOSFETs over a wide speed range. Analysis of the secondary
MOSFETs-controlled motor raised many interesting challengers. It was decided to use an
equivalent circuit approach to the analysis because the primary voltage and current were both
largely sinusoidal. The equivalent circuit used is based on the single-phase equivalent of a
balanced sinusoidal three-phase system. The effective value of the external rotor inductance
or capacitance is calculated. We have studied motor performance specially speed, motor
starting current, and torque during the control of duty cycle of MOSFETs. Also, MOSFETs
performance has been studied. Closed loop speed control of motor speed have been
investigated using hysteresis control based on controlling MOSFETs ON or OFF.
Experimental results have been carried out in our Lab. Now, compare the Experimental
results with the simulation results gives a good relative. |
