Electronic brake for motor

Electricity: motive power systems – Induction motor systems – Reversing

Reexamination Certificate

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Details

C318S375000, C318S378000, C318S381000, C318S445000, C318S272000, C318S277000

Reexamination Certificate

active

06906493

ABSTRACT:
In an electronic system, motor braking is accomplished by applying direct current (DC) voltage, developed across a capacitive element during a run mode operation, across terminals of an alternating current (AC) or an induction motor. While the motor is ON, i.e. during the run mode operation, a diode rectifies an AC input voltage applied across a capacitor for charging thereof. Resistive elements in series with the capacitor control a charging rate thereof. When a relay or switch flips over to a STOP or OFF mode, i.e. a braking mode operation, all of the stored DC voltage, which was charged across the capacitor during the run mode operation, is dropped across a coil of the motor. This DC voltage creates an electric force applied to stop quickly and efficiently the motor shaft rotation. In preferred embodiments of the invention, it was found that the higher the capacitance of the electrolytic capacitor, the faster and more efficient the stopping action will be for the motor.

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patent: 5-64474 (1993-03-01), None

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