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Need help with reversing DC motor circuit

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perni_a

New Member
Hi all,
Im needing help with a small personal project of mine, and I'm only starting out with working with components.

I have a 12V DC motor and I need it to do the folowing...

When 12v+ is applied, I need the motor to operate from the home position in the forward direction (clockwise).
When it reaches a point, triggered by a N.O. momentary switch, I need the motor to stop.
When 12V is removed, I need the motor to reverse direction (anti-clockwise) back to the original starting position and stop (again stated with another N.O. momentary switch) - and ready to go again when power is applied.
Contstant 12V is available for use, plus also switched 12V to start the process and end the process.

Any help you guys can shed would be greatly appreciated.
 

MikeMl

Well-Known Member
Most Helpful Member
I posted this somewhere about a week ago:
 

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Gary B

New Member
This could be easily done with a single 12 volt DPDT relay if you were to use NC limit switches instead of the NO specified. I don't have a graphics program to draw a picture so here it is in words:
+12 control to relay core and through one make contact. That movable contact to one side of the motor and the other side of the motor to to the other swinger. the second make contact goes to the limit switch and then to ground. the second break contact goes to fixed +12. The break side of the first break contact goes to the other limit switch and then to ground.

In other words, lets call the relay K, its contacts as K1MFB & K2MFB and the two terminals of the motor as M= and M-. +12 control to K and K1M. the other side of K coil to ground. K1F to M+. K1B to limit switch and the other side of the switch to ground. M- to K2F. K2B +12 perminant power. K2M to other limit switch and the other side of that switch also to ground.

To use the specified normally open switches, you have to use an additional relays or transistors to make it work.
 
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MOSFET KILLER

New Member
H-Bridges or Full Bridges are sometimes used to drive electric motors, they can use any transistor that can handle the current of the motor. If you use transistors you will need a lower voltage to turn them on, but transistors are trickier to use than relays.
 
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