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

H - Electricity

02

P

318/111

H02P 7/06 (2006.01) H02K 16/00 (2006.01) H02K 17/36 (2006.01) H02P 5/74 (2006.01)

Patent

CA 2026095

An induction motor of the invention, 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 which, in its closed state, makes the interconnection of respective stator windings of the stators a first series delta-connection in which the phase difference is 0°. The phase-changing device also comprises a second connection-changing switch which, in its closed state, makes the interconnection of respective stator windings of the stators a second series delta-connection in which the phase difference is 120°. When both the first and second connection-changing switches are closed, the interconnection of the stator windings becomes a parallel star-connection in which the phase difference produced is 60°. 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, intermediate speed operation, and normal or steady-state operation by the switching operation of the first and second switches.

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