Electric brake for an alternating current motor

Electricity: motive power systems – Braking – Plural – diverse or diversely controlled braking means

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Details

318375, 318373, 318380, H02P 308

Patent

active

057059039

ABSTRACT:
An electric brake circuit (10) for bringing an alternating current (AC) motor (12) to a rapid halt. When the AC motor is turned on, a braking capacitor (C1) is charged to a preselected voltage. A shunt regulator (18) prevents the braking capacitor from overcharging by shunting charging current to ground once the braking capacitor reaches the preselected voltage. In a preferred embodiment, a limit circuit (20) turns off the charging current on the subsequent positive phase of the AC line voltage powering the electric brake. By shutting off current flow to the circuit when the preselected voltage on the capacitor is reached, power consumption and size of the circuit are minimized.

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