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Unipolar Stepper Motor with NJM3517

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avi8or1

New Member
I'm trying to work on a project where we drive a stepper motor. Unfortunately, I'm stuck on even where to begin.

The Motor:
The motor we have has only 4 leads, which leads me to believe it's a unipolar motor? I tried to look up the part number, but there are no datasheets on the motor from the numbers on the label that I have. The wire colors are brown, yellow, orange, and (I can't remember) black?.

The Chip (NJM-3517)
EDIT: Here's a link for the datasheet:
http://www.datasheetcatalog.org/datasheet/newjapanradio/ee04001.pdf
*VCC +5V
*INH GND
*HSM' GND
*DIR VCC (+5V)
*GND' GND
*STEP Square wave with an amplitude of 5V

I'm not sure whether or not to hook up the two sets of wires to PA1, PA2 & PB1, PB2; or PA1, LA & PB1, LB; or something completely different.

I've also tried measuring the outputs from PA1, PA2, PB1, and PB2 on an oscilloscope, but seem to get nothing. I thought maybe I had blown the chip, but I got a new chip and it did the same thing, so I think that I'm wiring it up wrong.

Any advice would be awesome. Thanks!

-avi8or
 
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shortbus=

Well-Known Member
Most Helpful Member
You have a Bipolar motor and a chip for a unipolar motor. You need either a 6wire motor or a diferent chip.

All the rest of the information you need is in the data sheet.

Go here to get more information; Jones on Stepping Motors
 

avi8or1

New Member
You have a Bipolar motor and a chip for a unipolar motor. You need either a 6wire motor or a diferent chip.

All the rest of the information you need is in the data sheet.

Go here to get more information; Jones on Stepping Motors

How did you know that it was a bipolar motor? The handout that our professor gave us said that unifilar (unipolar) motors have 4 leads and bifilar (bipolar) have 6 or sometimes 8 leads. :confused:

But, we ended up using an MC3479 chip, which (I just looked) drives a bipolar motor. What do you know, it worked!
 
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