| 摘要 |
PURPOSE:To prevent excessive vibration of torque by detecting a slip angle of a rotating magnetic flux and a rotor, and by providing a feedback control to adjust the slip angle equal to an instructed amount. CONSTITUTION:Power is supplied to an induction motor 5 through an AC source 1, converter 2, DC reactor 3, and an inverter 4. Motor speed is detected by a tachogenerator 6, and is compared with a reference speed at a comparator 7 and resulting deviation signals are sent to a function generator 9 to generate an amount of current to be instructed I1*. A comparator 13 compares a signal coming from a power source current detector 12 with the amount being instructed, and a result is transferred through a current controller 14 and phase controller 15 to the converter 2 where a thyristor striking signal is produced. A slip angle between the rotor and the secondary magnetic flux of the motor is detected by a slip detector 19, and is compared with an output from a function generator 10 by a comparator 20. Resulting deviation signals are sent to a commutation controller 21 where commutation of the inverter is controlled. |
