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Old 01-30-2008, 11:08 PM   #1
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DC Motor help

This is actually for my car. I'm trying to create a DIY flip panel.

Like: push button. small panel flips 180 degrees. Push button again. Panel flips back over.

I have no experience working with motors but I learn quickly via trial and error.

My problem is I'm not quite sure how to get the motor to stop after a specific time or number of revolutions that way it doesn't just continually spin when I push the button.

I know I'll need a 12VDC Motor. Any idea how many RPMs would suffice? The panel won't flip fast. I'm imagining something similar to the motorized LCD head units.

Any help would be much appreciated!


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Old 01-31-2008, 12:26 AM   #2
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I'd use something called a 'linear actuator"; try this link to see how they work:


Here's a link to a company that sells them.



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Old 01-31-2008, 12:32 AM   #3
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Yes. I just found that site. I've been searching for a more cost effective method though. But after researching it would seem I would need to fork over the hundred dollars for a linear actuator.

On the other hand the flip panels for car audio head units motors and not actuators. Someone suggested taking apart an old CD drive and somehow using it's motor and gear to power a flip panel.

Does this sound feasible?
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Old 01-31-2008, 11:51 AM   #4
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Relays or reversing switch will work you will have to work out a switch that will open the circuit similar to a limit switch when the panel reaches where you want it to stop. This will remove voltage from the motor. I few examples below.
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DC Motor help-reversing-motor-2.jpg   DC Motor help-reversing-motor.jpg  

Last edited by Stubbie; 01-31-2008 at 11:59 AM.
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Old 01-31-2008, 12:04 PM   #5
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Windscreen washer motors are perfect for this appliaction although external mods will need to be done to it. They are relatively small, operate at comparatively low speeds, cheap & readily available as a second hand item.

"Limit switches" can be used to operate the motor in your desired application, in much the same way that limit switches are used to control windscreen wipers. A small gearbox could be fitted to the motor & then a metal cable could be used to provide the turning force from the gearbox to the load.

In the past, I have designed my own electric "overdrive" for a Toyota Landcruiser, using one of these motors & a couple of limit switches. It worked beautifully.
Switchboard design engineer & Licensed Electrician (Australia).
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