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Author Topic: STEPPER MOTOR GENERATOR MEETS BALL MAGNET  (Read 5273 times)

magnetman12003

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STEPPER MOTOR GENERATOR MEETS BALL MAGNET
« on: September 14, 2009, 03:19:11 AM »
Hi Guys,

I was experimenting with a stepper motor and a nearby ball magnet was attracted to its metal case. By chance it landed on the "Sweet Spot"   My U tube movie shows and tells all.  Maybe someone can tell me whats going on??      Try it.

http://www.youtube.com/watch?v=2bHyJDbd9og&feature=channel_page

Tom

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Re: STEPPER MOTOR GENERATOR MEETS BALL MAGNET
« Reply #1 on: September 14, 2009, 05:43:41 AM »
Looks like you increased the magnetic field that the rotor cuts through, increasing the output.

Was it harder to turn the shaft when the ball-magnet was in-place than when it wasn't (might not have been that noticeable with an LED load)?

 

magnetman12003

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Re: STEPPER MOTOR GENERATOR MEETS BALL MAGNET
« Reply #2 on: September 14, 2009, 06:00:23 AM »
I found that turning a 400 step motor is like turning a very fine tooth mechanical thumb ratchet.  With the ball magnet on the motors casing the turning felt not so very fine toothed but offered the same resistance??   I am now going to see what a 1 inch sphere magnet does.  I just hope I dont ruin the stepper motor in the process.

 Something inside the stepper motor is latched onto the ball magnets energy field and that is very apparent ???

Tom

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Re: STEPPER MOTOR GENERATOR MEETS BALL MAGNET
« Reply #3 on: September 14, 2009, 08:33:33 AM »
You won't hurt anything if you're just turning it by hand.

Now, if you were to drive it with another motor (like with a flexible shaft-coupler) rather than turning it by hand and you had a low-resistance load on it, you could, conceivably, burn the windings in your stepper-gen.

Try that (the motor-generator thing) with a couple of cheap radio shack dc motors (you can try the external booster-magnet thing on them too).

Tony