Induction motor switchable between series delta and parallel wye

Details Induction motor switchable between series delta and parallel wye Induction motor switchable between series delta and parallel wye

1990-09-27

1991-11-26

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68R, 318771, H02P 132, H02P 528, H02P 800, H02P 1306

Patent

active

050685597

ABSTRACT:
An induction motor, including a single rotor formed in one-piece and first and second stators disposed side by side, has a phase changing device for varying the phase difference between the rotational magnetic field generated by the first stator and that generated by the second stator. The phase changing device comprises at least first and second short-circuiting switches for short-circuiting or disconnecting the series-junction nodes of the stator windings. The first switching produces a configuration intermediate to series delta and parallel Y (Wye), and the second completes the transformation from delta to Y. The motor presents three different torque curves suitable for starting operation, intermediate speed operation and normal or steady-state operation by the switching operation of the first- and second-switches.

REFERENCES:
patent: 2182646 (1939-12-01), Shutt
patent: 4446415 (1984-05-01), Taylor et al.

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