H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/13, 341/89
H02P 1/54 (2006.01) B02C 17/24 (2006.01) B02C 25/00 (2006.01)
Patent
CA 1185315
ELECTRIC INCHING IMPULSE CONTROL ABSTRACT OF THE DISCLOSURE There is provided an electrical inching control for inching a drive system comprising a grinding mill driven by one or more three phase synchronous motors. The electric inching control includes an inching power bus and contactors or the solid state equivalent thereof. The inching bus supplies energy to the stator windings of the synchronous motors. The contactors or switches connect the positive and negative sides of a direct current power supply to the different phases of the stator windings in a sequency which provides a stepped rotating magnetic field, and the-rotor field windings are excited with direct current. The interacting stator and rotor fields causes a rotation of the rotor a predetermined amount with each step causing the mill also to rotate a respective predetermined amount. The electric inching control of the present invention further includes a vibration sensor which detects vibration in the gearing driving the mill and the signal from the vibration sensor is applied to a feedback voltage magnitude control which adjusts the magnitude of voltage applied to the stator windings of the synchronous motors reducing the voltage as the signal representing vibration increases to reduce the adverse mechanical forces incurred by the mill.
391915
Eastcott Peter Deh.
Trussler Ronald C.
Canadian General Electric Company Limited
Eckersley Raymond A.
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