Electricity: motive power systems – Synchronous motor systems – Pole changing motor winding circuits
Patent
1978-03-29
1980-09-09
Truhe, J. V.
Electricity: motive power systems
Synchronous motor systems
Pole changing motor winding circuits
318773, H02P 748
Patent
active
042219990
ABSTRACT:
A three-phase motor is wound with three spaced phase windings each having first and second multiple section windings. The second winding sections of each are connected in series. The first winding has one end of all three phases connected in common. The second winding has one end connected to the common intermediate connection of the first winding sections. The outer ends of the windings are connected to a two-speed switch having two different positions for alternate direct connection of the two windings to incoming phase lines. In one position, both sections are in circuit with the three oppposite ends of the one winding connected to each other to form a second common connection. In second position, the second windings is disconnected and the first winding sections are connected in series in a star circuit, with the current flow in the two sections of each winding reversed from the first speed connection. The switch includes five separate switches, three of which have a common pole connected to a phase line and an associated high speed contact and low speed contact connected to the windings and two of which have interconnected common poles and associated contacts to the terminal ends of the second winding.
REFERENCES:
patent: 3070734 (1962-12-01), Rawcliffe
patent: 3175143 (1965-03-01), Rawcliffe
patent: 3197686 (1965-07-01), Rawcliffe et al.
patent: 3233159 (1966-02-01), Rawcliffe
A. O. Smith Corporation
Indyk Eugene S.
Truhe J. V.
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