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steppr motor question

steppr motor question

Postby funtasma » Fri Oct 08, 2010 2:39 pm

I bought the wrong motor. Instead of a bipolar I baught a six wired unipolar motor. I know I can simply use the motor by forgetting about the middle cable of each phase to cmbine the two circuits of the phase to one. But when I do this the Ohm value doubles according to what I meassured (from 5.5 to 11).

Now my question: Does also the required Ampere double from 1.2A to 2.4A? This would be important to know since I don't want to grill my controller. 8)

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Re: steppr motor question

Postby WalterMo » Fri Oct 08, 2010 3:22 pm

You bought the right motor. This one is more universal. :idea:
The current does not double, it will be halved. 0.6A per coil is sufficient to drive a gear and to pan a laser.

Your motor driver will be glad because it will not be heated up so much. :)


Edit: The oddity is: The current is halved, but the power of the motor shaft is the same. Important for the power of the motor (or a relay) is the product of current and number of turns of the coil.

In the bipolar mode the whole coil (2 x ½) is always used. The current is flowing alternating in both directions.
In the unipolar mode only the ½ coils are alternating used by a current which doesn't change its direction.
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Re: steppr motor question

Postby funtasma » Fri Oct 08, 2010 8:31 pm

Thanks Walter, then I can start building!!
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