Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-12-26
1991-11-26
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310211, H02K 1718, H02K 1716
Patent
active
050685600
ABSTRACT:
A modification of the squirrel cage of an alternating current motor reduces the starting current amperage. A conventional motor squirrel cage, which includes rotor bars and shorting rings, is modified so that the cage may have two or more controllable resistance values by segmenting the shorting rings. A high resistance cage is obtained for initial motor starting when the open segmented shorting rings provide a high resistance path within the squirrel cage circuit. Subsequent to the motor's attaining full rotation speed, a low resistance value of the squirrel cage is achieved by shunting the segmented shorting rings, which gives the motor its optimum running efficiency. In one embodiment, a mechanical means is used to accomplish the shunting of the shorting rings. In a second embodiment, a solid state control device is used to accomplish the shunting of the shorting rings.
REFERENCES:
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patent: 3445699 (1969-05-01), Beaudry et al.
patent: 3496397 (1970-02-01), Andresen
patent: 4439704 (1984-03-01), Adelski et al.
Rebsch D. L.
Stephan Steven L.
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