High starting torque induction motor

Details High starting torque induction motor High starting torque induction motor

1995-09-08

1998-05-12

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68B, 310 68E, 310211, H02K 1718, H02K 1716

Patent

active

057510822

ABSTRACT:
A high starting torque induction motor with simultaneously reduced starting current adapted to be associated with a drive having a high load torque on starting that includes a stator, a rotor, a first end ring fixed on said rotor, a second movable end ring associated with said rotor and having a lower electrical resistance than the first ring, and a centrifugal device associated with the second ring and operable upon the rotation of the rotor at a predetermined speed such that, when the motor is electrically energized, the high resistance of the first ring produces a high starting torque at reduced starting current, and when the motor achieves a predetermined speed, the second ring is moved into engagement with the first ring reducing the effective resistance and permitting normal operation of the electric motor.

REFERENCES:
patent: 3904731 (1975-09-01), Orkin et al.
patent: 4377731 (1983-03-01), Georgelin
patent: 5068560 (1991-11-01), Lundquist

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