| 摘要 |
PURPOSE:To apply a torque boost being large when an output of an inverter is low and decreasing as the output frequency increases, to the inverter by integrating a magnetic flux command signal as a torque boost command signal. CONSTITUTION:Data of a magnetic flux command signal is output from a microcomputer 1, and a signal Bphisinomega is generated by a D/A converter 1. The above data is converted to a signal Ephisinomegat by a D/A converter 3, and integrated by an integrator 10 to generate a signal represented by -(C/omega)phicosomegat. When both the signals and a signal -Dphisinomegat integrated by an integrator 9 from the fed-back output voltage are added by an amplifier 4, the resultantly obtained signal becomes a signal differentiated from a magnetic flux command signal and a torque boost command signal, and represented by a formula I. This signal is compared with a triangular wave generated by a triangular wave generation circuit 5 by a comparator 6, a PWM signal is generated, insulated and amplified by a driver 8 to drive a power switching element 7. |
