Dual-stator induction synchronous motor
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United States of America Patent
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-
Oct 19, 1993
Grant Date -
N/A
app pub date -
May 28, 1991
filing date -
May 26, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
An induction synchronous motor with two rotor cores and two stator cores includes a rotor having two mutually connected first rotor windings (31,31) of a predetermined number of poles and two mutually connected second rotor windings (33,34) connected of a different number of poles with respect to the number of poles of the first rotor windings; and two stators having two stator windings (21,22) of the number of poles identical with the number of poles of the first rotor windings (31,32) and two excitation windings (41,42) of the number of poles identical with the number of poles of the second rotor windings (33,34). The motor further includes a rectifier circuit (35) for rectifying outputs from the second rotor windings (33,34) and supplying the rectified voltages to the first rotor windings (31,32) at a synchronous operation. A phase shifter (SW1) associated with the first stator windings (21,22) produces a phase difference of 180.degree. between a rotating magnetic field around one of the rotor cores and that around the other one of the rotor cores. The motor starts based on a theory of an ordinary induction motor under a phase difference of 0.degree. and can operate as a synchronous motor after the rotating speed has reached its synchronous speed under the phase difference of 180.degree. produced by the phase shifter.
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