Synchronizing synchronous motors prior to clutch closure

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

H - Electricity

02

P

318/14, 318/74,

H02P 1/54 (2006.01) H02P 5/74 (2006.01)

Patent

CA 1193648

SYNCHRONIZING SYNCHRONOUS MOTORS PRIOR TO CLUTCH CLOSURE ABSTRACT OF THE DISCLOSURE 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 synchronized 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 to the stator windings of both motors and ramps up or increases the amplitude of the low frequency supply. This brings the rotors into synchronism 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 synchronized.

417913

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