Method and apparatus for switching back a change-pole motor

Details Method and apparatus for switching back a change-pole motor Method and apparatus for switching back a change-pole motor

1993-12-03

1995-07-25

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318768, H02P 748

Patent

active

054365465

ABSTRACT:
To enable a gentle switching back of a change-pole motor to a low speed while ensuring the full moment or torque on passing into motor operation, a method for switching back the change-pole motor to the lower speed is proposed wherein initially there is a two-phase switching back to the lower speed, and wherein, on dropping below the predetermined switching current, the third phase is switched in. For this purpose, an ammeter is provided in the switched-in phase, with a comparator being provided for comparing the actual current with the predetermined switching current, and with a switch also being provided in the third phase to be switched in.

REFERENCES:
patent: 3872694 (1975-03-01), Sikamori et al.
patent: 4122919 (1978-10-01), Anzai
patent: 4348626 (1982-09-01), London
patent: 4994725 (1991-02-01), Gschlossl

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