Induction motor switchable between series delta and parallel wye
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United States of America Patent
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-
Nov 26, 1991
Grant Date -
N/A
app pub date -
Sep 27, 1990
filing date -
Oct 5, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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