Double 7.5-kW Three-Phase Switched Reluctance Motors Parallel Drive System for Electric Locomotive Traction

This paper has proposed an electric locomotive in coal mine drawn by the parallel drive system of the switched reluctance dual motors. The principles of the Switched Reluctance motor drive operated at four quadrants with the fixed conducting angles PWM control strategy, the scheme of the symmetrical traction at I-quadrant and at Ill-quadrant, and the scheme of the symmetrical regenerative braking control at II- quadrant and at IV-quadrant, are given. The major components of the prototype are explained in detail. The closed-loop rotor speed control of the main motor, synchronization of the rotor speed and balance distribution of loads between the main motor and the subordinate motor have been implemented by the fuzzy logic algorithm. The experimental results of the prototype are included. It is shown that the rotor speed error of the subordinate motor is within 5% and the error of the output torque of the subordinate motor is within 10%.