かご形3相誘導電動機の速度制御

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Generally, a 3 phase squirrel cage induction motor is a constant speed type, and it is driven at the speed of 2∿5% slips from synchronous speed. For the speed control methods of 3 phase squirrel cage induction motor, there are pole change, supply frequency change, supply voltage change methods, and the others. On the applying the pole change method, the 3 phase squirrel cage induction motor has only 2 or 3 speeds, and can not change the speed for the wide range. The supply frequency changing method requires the variable frequency changer that is more expensive than that motor. The supply voltage changing method is simpler than the other methods, but if the slip at the stalling torque is not displacement to the large amount of slip, the speed controlling range is narrow, furthermore, the speed regulation for the load torque variation is large. Therefore, the authors improved the supply voltage changing method by applying a special manner. That is, the stator of induction motor has 4 and 8 pole windings separately, and there is no mutual inductance in each other. On the othere hand, in order to expand the speed controlling range, it has to make the rotor resistance increases by means of the end ring with cutting out symmetrically, and up to the 0.5 slip of synchronous speed for the stalling torque. We are using the 3 phase sliding transformer, and make to change the supply voltage of 4 and 8 pole windings, according to the sum of both supplying voltage is constant. Then, the 4 pole machine acts as a induction motor and the 8 pole machine acts as a induction generator. So that, by the change of supplying voltage to each winding, the speed of the 3 phase squirrel cage induction motor is controlled widely and smoothly, in spite of on the load or no load, and for the constant load torque or square load torque. In this case, the power from induction generator is feeding back to the power source.
山梨大学の論文

かご形3相誘導電動機の速度制御

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