Synchronizing synchronous motors, motors prior to clutch closure
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United States of America Patent
Stats
-
Jan 1, 1985
Issued Date -
N/A
app pub date -
Dec 19, 1983
filing date -
Dec 9, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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