G - Physics – 05 – B
Patent
G - Physics
05
B
318/18, 318/84
G05B 19/40 (2006.01) G05B 19/23 (2006.01) H02P 3/18 (2006.01)
Patent
CA 1055109
MOTION CONTROL SYSTEM FOR AN INDUCTIVELY CONTROLLED MULTI-PHASE MOTOR Abstract of the Disclosure A control system moves an inductively controlled multi-phase motor in a forward or reverse direction. The motion may be in steps or it may be a continuous rotation. Dynamic braking of the rotation in either direction, either in steps or continuous rotation, is achieved by activating one or more phases of the multi-phase motor that lag the selected phase. Detent is accomplished by deactivating the lagging phase or phases at a prescribed time so that the selected rotational phase will then be applied to stop the motor at the desired motor pole. When the rotation of the motor is continuous and stopping is required, the dynamic braking circuitry continually compares the decaying voltage of a predetermined standard RC time constant circuit with the decaying voltage of a measuring RC time constant circuit that varies in accordance with the velocity of the motor. A comparator circuit compares the two voltages and, until they reach a minimal prescribed difference, causes a current to flow in the motor coils associated with the lagging phase or phases. When a limit is reached, two specified motor phases are selected, one being a lagging phase with respect to the other, the lagging phase being deactivated after a prescribed period of time has elapsed, so that the motor then detents at the prescribed motor pole.
223082
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