H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/10
H02P 3/00 (2006.01)
Patent
CA 1246662
IMPROVED APPARATUS FOR STOPPING A GRINDING MILL ABSTRACT OF THE DISCLOSURE In a system having a large load driven by at least one electric motor through a clutch, when the system is to be stopped, the power is removed from the motor and the clutch opened or released. The motor and load will continue to move until stopped by friction and it is desirable to stop them more quickly. When the motor is freely rotating and the load oscillating, as in a grinding mill, the clutch may be pulsed at spaced intervals of time for a short duration to a level where the clutch is partly closed and this will slow both the motor and load. Alternately the motor may be electrically braked by placing a low resistance across the rotor windings and applying DC to the stator windings of the motor. When the motor is stopped it can be used to brake the load by locking the motor with an application of DC to the rotor and stator windings and periodically pulsing the clutch to partly close the clutch for short durations of time. In accordance with the invention the motor is not locked during the pulsing of the clutch but is caused to rotate very slowly in order to cause the slip rings carrying DC power to the rotor to rotate beneath the associated brushes to prevent generation of heat in a localized area beneath the brush.
485705
Canadian General Electric Company Limited
Eckersley Raymond A.
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