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 Last Updated on:  06/01/2008 08:11:57 PM

Automatic DC Motor Brake
In many DC motor powered systems you would like the motor to quickly come to a full stop.  This circuit provides an automatic electronic braking action to any DC motor ranging from 6v to 24v up to 1 amp of current.  Some of the component values could be changed for larger motors.
When power is applied to the hobby circuit, Q1 is turned on.  This routes zero volts to the gate of Q2, turning off Q2.  Current flows to the motor through the diode D2.  When power is removed from the circuit, Q1 quickly turns off which routes some stored charge from C1 to the gate of Q2.  This turns on Q2, which provides a heavy current path for the free spinning voltage emerging from the motor windings.  The value of R3 can be selected for any desired braking action.  The fastest braking time occurs when the resistance of R3 is zero ohms.
 

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DC Motor Drive with Automatic Brake

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