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INDEX |
MY EXPERIENCE IN AUTONOMOUS ROBOTICS | |
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Stepper Motor
Introduction Identifying the Leads of Stepper motor Stepping of stepper motor and more links
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Identifying the leads of Stepper motor Stepper motors are available with 4 wires, 5 wires, 6 wires. Wires are not like a DC motor. 4 wire stepper motor is surely a bipolar motor, 5 wire motor will be surely a unipolar motor and 6 wire motor can be used as a unipolar motor as well as a bipolar motor. If you short two pins of 6 wire motor it become unipolar and if you leave two wires open then it become bipolar motor. The next task is to identify the leads of the stepper motor. Let's start with a 6 wire motor. First take a multimeter having continuity test and resistance testing.
The inside of a 6 motor stepper wire is like this. Every wire has different colors. So take a paper and note down the color. Now start identification, it is a logical task. You can see that resistance between (a,f),(a,d),(d,b),(b,f),(c,d)(c,f),(e,c),(e,a) are infinite because there is no connection between them. So first identify the wires which are having infinite impedance between them. The two coils are identical and let the resistance of the coil be X so the resistance between (a,c),(d,f) will be X. Second thing is that resistance between (d,e),(e,f),(a,b),(b,c) are X/2. Do these analysis and identify the lead and give the terminal names a,b,c,d,e,f. Now you got the wire color and terminal names. Do the analysis carefully, by applying some logic. If you short circuit (e,b) then the motor will be unipolar and if you leave (e,b) open then the motor will be bipolar. The motor i have got is having resistance ,X=30 ohm. You can do same analysis for bipolar as well as unipolar motors. For a bipolar (a,c),(d,f) coils exist and the resistance between (a,c) and (d,f) is X and high impedance between (a,f),(c,f),(a,d),(c,d). For unipolar motor the one i used is having resistance X=30 ohm . In that case first find the common lead,B
You can see that resistance between (B,a),(B,c),(B,d),(B,f)
will be X/2 and resistance between (a,c),(d,f) will
be X ,same with (a,d) and (c,f). So you should
first identify the common lead. Another way of identification is
given in the following link |
