Torque ripple reducing device at the time of low-frequency PWM inverter

摘要

(57) [summary] [purpose] by the influence of the dead time I reduce the pulsation of the sixth-order torque generated at a low frequency. [Configuration] converter circuit 11 ₁ reverse parallel converter circuit and without that was connected to the switching element in anti-parallel, the DC voltage command Vd corresponding to the rotational speed of the output frequency or the motor 14 of the DC voltage Vd and the inverter circuit 13 * and the power and input to the base circuit 36 ​​from the synchronization voltage signal a making a phase control signal b in the phase control circuit 35, of the base circuit to determine the polarity of the DC voltage Ed and the DC voltage command Vd * of the differential voltage in polarity determination circuit 33 Enter the output in the order base drive circuit 37 or the reverse base drive circuit 38 forward side switching element T Phase control _F or reverse side switching element T _R is changed according to the number of the output frequency or the motor rotates the DC voltage Vd to.