HOW TO FIND THE COILS IN SMALL STEPPER MOTOR ( Only 4 WIRES)

Hi ,
I have bought a stepper motor which is having only 4 wires and also small in size. Usually stepper motors will be having 5 or 5 wires with 2 pair of coils and 1 common,so we can easily find out the terminals. but in this how I can find out the common and other terminals, I want to interface to the 8051 controller for the complete PROXIMITY ROBOT project since with that stepper motor I can't make the Choasis and other thing, since it is big in size.

CAN ANY ONE HELP IN THIS MATTER.

REGARDS n THANKS
Sanath Mcx

Hi sanath,
I think you've got a Bipolar stepper motor which has two coils separated with no common. it has 4 wires instead of 5 or 6 wires in case of uni polar stepper motor. Below is a digram of Bipolar stepper motor



To check which wire for which coil.. simply do the connectivity test

Thanx alot Ajay,
i didn't know about this Bi-Polar Stepper Motor. Now I will try to find the wires for corresponding coils.
:-) :-) :-)

soon i am going to write a new tutorial for stepper motors...
i only discussed about Unipolar Stepper motors (5 or 6 wires). But i think i have to write for Bipolar motors too

i have a deiled info on stepper motors soon i will share with u

I have already put all the information about stepper motors in my tutorial.. please take a look. if you think something is missing please tell me

Hello exo ed

I have removed your post to keep this thread on track.
As Ajay said in your other, similar post

exo ed, this is not right place to post
Please post in 8051 discussion forum.

=Ajay

You Can Refer datasheet for That Stepper Motor


karan