| 摘要 |
PURPOSE:To maintain the efficiency and the torque of a motor at the low speed time and at the accelerating or decelerating time by automatically providing frequency-voltage characteristics adapted respectively for constant speed and accelerating or decelerating time of the motor for driving a square torque load. CONSTITUTION:An electric power from an AC power source 1 is applied through a converter 2 and an inverter 3 to a load motor 5. The output of a setter 6 is applied to a lamp function generator 7 and a voltage command switch 8. The output of the generator 7 is supplied to a voltage instructing switch 8 and an oscillator 9. A voltage control circuit 10 recevies an intput to different terminals in response to the magnitude of the input or output of the generator 7 from the switch 8, and recevies a voltage feedback signal through the inverter 11 and the diode 12. The current control circuit 13 compares the outputs from a current transformer 14 and a diode 15 with the output of the circuit 10, thereby forming a minor loop. A pulse distributor 16 controls the inverter 3 with the pulse signal from the oscillator 9. |
