4 3 APPARATUS AND METHOD FOR REDUCING TORQUE RIPPLE IN THREE PHASE MOTOR CONTROLLER USING FOUR SWITCHING ELEMENTS

摘要

The present invention to a voltage generated by relates to the torque ripple reduction apparatus and method of the three-phase motor controller using the four switching elements, charging and discharging a DC voltage which is in particular input using the four switching elements to rotate the three-phase motor and upper and lower DC link capacitor to supply the inverter to the three-phase one arbitrary phase of the motor a DC link and a current detector for detecting a current of the place connected to the neutral terminal, by integrating the current detected by the said upper and lower and obtain a voltage difference of the DC link capacitor indirectly integrator, the voltage difference obtained in the above, compensation for using a difference in speed and the rotor position between the actual speed and the reference speed of the motor switches the a, B phase switching elements of the inverter calculating the components, and provides the switching time, including a compensation component to obtain a voltage command generator for controlling the speed of the motor And, phase, and detecting the voltage difference between the bottom of the direct current link terminal indirectly, to one by adjusting the switching times according to the detected voltage difference so as to reduce the ripple in the generated torque.