Sectional motor starting winding circuit for three-phase motors

Details Sectional motor starting winding circuit for three-phase motors Sectional motor starting winding circuit for three-phase motors

1982-01-27

1983-11-22

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

H02P 142

Patent

active

044171927

ABSTRACT:
A circuit for starting three-phase motors having a pole pair number p=2 and an uneven slot number q (slots per pole and phase) which is larger than 1 has a motor winding which is divided into two sections which can be switched on successively. To avoid a unilateral magnetic pull on the rotor during start up, the winding section to be switched on first includes more than one-half of the coils employed in each phase. These coils are tied together to form at least two identical parallel branches which are spatially shifted 360.degree. per pole. The balance of the coils, which form the winding section to be switched on later, are tied together to form at least one further parallel branch, and this branch (or branches) has the same number of turns as each of the parallel branches of the winding section which is to be switched on first.

REFERENCES:
patent: 2649561 (1953-08-01), Hutchins
patent: 3068389 (1962-12-01), Cantonwine
patent: 3237072 (1966-02-01), Contonwine

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