Stepper motor control

461

03:43:03

Stepper motor control 

published 10 years ago

hurz

10 years ago

current is 180degree shifted. You are lucky if the motor turns in the direction you want. It might even dont turn and just vibrate. It needs a 90degree shifted current to work for a bipolar stepper. Hope this helps spinning

rich11292000

10 years ago

All true. That's why single phase motors have capacitors to create a 3rd pole for direction.

hurz

10 years ago

I'm not a motor guru, but a cap can only be used for (asynchronous?) motors with more or less constant sine wave frequency. Cap and Coil must fit together to make a proper phase shift. Stepper motor do run with rectangular/triangle waves and different frequencies from high to low and even static to hold some Newton for a stop/hold momentum.

rich11292000

10 years ago

Correct, a stepper could be configured to use a cap but you would have to use it like an asynchronous motor. Worthless/bad idea.

hurz

10 years ago

NoNo, this not a bad idea. Its an Idea and a good comment! Its only an unusual way to operate a stepper. But its possible, why not!

hurz

10 years ago

BTW, after having a look to the circuit and not just on scope ;-) this circuit is anyway not working for several reasons

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