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DiscoverCircuits.com -- Hobby Corner
"Hobby Circuits for
your Hobby Projects"
Last Updated on:
06/19/2009 02:48:41 PM
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Automatic DC Motor Brake
designed by David Johnson, P.E. |
| 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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Click on Schematic below to view PDF
version of this Circuit |
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