Y-delta conversion switches on dual stator induction motor

Details Y-delta conversion switches on dual stator induction motor Y-delta conversion switches on dual stator induction motor

1990-09-26

1991-09-24

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

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

Patent

active

050516396

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 a first-connection changing switch for making the interconnection of respective stator windings of the stators the first series delta-connection in which the phase difference is 0.degree. when it is in its closed-state and a second-connection changing switch for making the respective stator windings the second series data-connection in which the phase difference is 120.degree. when it is in its closed-state. When both the first- and second-connection changing switches are closed, the interconnection of the stator windings becomes a parallel Y (or star)-connection in which the phase difference produced is 60.degree.. During the motor operation, at least one of the first-switch and the second-switch is always kept in its closed-state. The motor exhibits three different torque curves suitable for starting operation, an 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: 4785213 (1988-11-01), Satake

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