Synchronizing synchronous motors, motors prior to clutch closure

Details Synchronizing synchronous motors, motors prior to clutch closure Synchronizing synchronous motors, motors prior to clutch closure

1983-12-19

1985-01-01

Truhe, J. V.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Synchronizing or phasing control

318 5, 318 53, 318 59, 318 66, 2411012, H02P 546

Patent

active

044917678

ABSTRACT:
In the inching of a grinding mill or similar apparatus which is driven by a pair of synchronous motors through fluid actuated clutches, the motors must be angularly alined one with the other in order that the load be shared equally between the motors. The apparatus of the invention connects the field supply to both motor fields and then it connects a zero frequency supply (i.e. a DC supply) to the stator windings of both motors and ramps up or increases the amplitude of the supply. This brings the rotors into alinement without undue oscillation. When the amplitude of the low frequency supply reaches a predetermined level, the clutches are closed or locked and the motors are connected to the load with the rotors in angular coincidence or alinement.

REFERENCES:
patent: 3557686 (1971-01-01), Sapolsky
patent: 3557692 (1971-01-01), Lee
patent: 3742321 (1973-06-01), Bergman et al.
patent: 3991349 (1976-11-01), Watson et al.
patent: 3991350 (1976-11-01), Miyagoshi
patent: 4042128 (1977-08-01), Shrader
General Electric Technical Information, GET-1722C "Spotting Equipment for Synchronous Motors", General Electric Co., Nov. 1966.
D. D. Stephen, "Synchronous Motors and Condensers" Chapman & Hall Ltd., London, England 1958.

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