Re: over voltage of a 12vdc motor
- From: Tim Wescott <tim@xxxxxxxxxxxxxxxx>
- Date: Mon, 30 Apr 2007 09:51:27 -0700
CCE wrote:
I have a 12vdc motor from a power car window and I need to run it at aThe motor brushes get stressed by high currents; if you start the motor on higher than normal voltages they'll get stressed more, leading to faster (sometimes immediate) wear.
higher speed. The load on the motor is pretty low. What can I expect
if I run this motor at 18 or 24 v?
The motor bearings get stressed by high speeds; running the motor on a higher voltage will make it go faster. Whether this causes problems depends on your bearings.
Iron losses will be higher because the armature windings will be running at higher than normal frequencies, but if you're loading it lightly this may not be an issue.
The brushes may bounce if you're going at 2x the normal speed, leading to quicker (but not immediate) wear and intermittent lower torque.
If you're driving it from something that can limit the current as it starts up you may be fine, or you may run into brush or bearing problems. If it's a car window motor chances are that it's running pretty close to the limits of its design, but you can only tell by giving it a whirl.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
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"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
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