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DC Motors - controlling the angle

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malek2610

malek2610

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DC Motors

Hello everyone,

I use a DC motor and I know how to control the speed and the direction of my motor, but I want to control the angle of rotation, so can you help me please, because I can't find a solution for this problem.

thank you !
 

Re: DC Motors

Unless it's a stepper motor, I don't think you can. Normal DC motors have no reference 'zero' position so even if you could move by a determined number of degrees, you wouldn't know the starting point.

Brian.
 

DC Motors

You would need to add a feedback system e.g. encoder, servo potentiometer.

Keith.
 
Re: DC Motors

hello,

this can be resolved very easily with a hall effect encoder
put a mechanical obstacle
read the encoder pulses,
when the encoder stops counting,
you know who is standing in the point 0..
and from the point 0 has turned the engine backwards and estimate how many pulse per spin you.
divide by the degrees you want to know and you have your engine positioning.
This is a solution that is widely used in vending machines

example:

get 720 pulses per rotation

720/360º = 2 = pulse x degrees

90º to have to count 180 pulses

another option is to work with time, but if your mechanics are not needed is not a good solution

regards.
 

DC Motors

You can position DC motors by monitoring the motor current. The brush commutation creates a ripple in the motor current which can be used to control position.

**broken link removed**
 

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