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Topic: Driving a 1.4V 3.8A Vexta? (Read 2036 times) previous topic - next topic

roypardi

Hi - I have a 1.4V 3.8A Vexta  unipolar (4 wire) stepper pulled from some recycled hardware.

It's a nice motor I am wondering how (and if it is worth bothering) to drive it. I usually use H-Bridges (L293 or SN754410NE) but those won't handle that current. Apart from buying a dedicated driver ($$) for this motor is there a cheap way I can drive this?


As an aside - can someone explain what the deal is with low voltage/high current steppers? I've used high voltage/high current motors before but this one seems like an oddball.


Grumpy_Mike

Quote
As an aside - can someone explain what the deal is with low voltage/high current steppers? I've used high voltage/high current motors before but this one seems like an oddball.

It's quite usual for a stepping motor. In order to get the maximum speed you drive it with as high a voltage as possible. Then you use a chopping regulated driver to limit the current to the right value. These sorts of drivers are not cheap as you will probbly need one with external FETs.

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