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Stepper motor overcurrent

Stepper motor overcurrent

Stepper motor overcurrent

(OP)
Hello,

My company  hold water pipe valves open with stepper motors when water is flowing through.
They also regulate the flow  with these steppers.

We have a stepper motor with a rated current-per-phase   of  324mA (=6V/18.5R)

My company are proposing to operate this motor  in full stepping mode, with a chopper driver, with 750mA average current in each of the two motor phase windings.

Here is the stepper motor datasheet..................


The stepper motors are the UBB(1/5), 6V, 18.5 Ohms per phase type on this datasheet:-

DATASHEET:
http://www.auf-vertrieb.business.t-online.de/pdf/UBB.pdf

-Please can you second my opinion that this is madness?

-this is way too much current for this motor?
 

RE: Stepper motor overcurrent

You would need almost 14V (at stop) to get 750mA through 18.5ohms, and higher at speed. Looks problematic to me for a 6V motor.

The power dissipation of 750mA is over 5x greater than that of 324mA. That would be very hard to get rid of.

Curt Wilson
Delta Tau Data Systems

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