Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Patent
1979-09-17
1981-09-22
Truhe, J. V.
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
318708, 361 29, H02H 708
Patent
active
042912636
ABSTRACT:
This invention relates to a system for protecting an amortisseur winding during the starting of a synchronous motor. The system compares the actual slip frequency of the accelerating motor with predetermined slip frequencies. These predetermined slip frequencies are each associated with a timer which measures successive time segments. Each timer is stopped when the actual slip frequency, which decreases as rotor speed increases, is less than the associated predetermined slip frequency. When the timer is stopped a successive timer is started. In this manner the acceleration of the motor is broken up into time segments. The initial timer is started when the motor starts. The final timer is stopped when the rotor field current is applied to bring the motor into synchronism. Should any timer be permitted to have its timed segment expire before being stopped, the motor is shut down. There is also provided a thermal memory which receives information from the expired timer as to its associated slip frequency. This information is used to inhibit the motor from being restarted until the amortisseur winding has cooled. Previous systems were straight timing functions which crudely approximated the motor's acceleration. The present invention provides a system that more closely approximates the motor's non-linear acceleration characteristic.
REFERENCES:
patent: 1797009 (1931-03-01), Matson
patent: 2169029 (1939-08-01), Michel
patent: 2308304 (1943-01-01), Reagan
patent: 2802161 (1957-08-01), Reagan et al.
patent: 3069609 (1962-12-01), De Snoo et al.
patent: 3388305 (1968-06-01), Smith
patent: 4128792 (1978-12-01), Herzog et al.
Herzog Gordon W.
Murdoch James C.
Stevenson Andrew C.
Canadian General Electric Company Limited
Eckersley Raymond A.
Moose Richard M.
Truhe J. V.
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