Stepper Motors

Discussion in 'General Electronics Chat' started by nanobyte, Jan 30, 2006.

1. nanobyte Thread Starter Senior Member

May 26, 2004
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While doing some reading on stepper motors I encountered a sentence saying that most stepper motors have four stator windings that are paired with a center-tapped common. What is a center-tapped common?

2. Jalal New Member

Jan 30, 2006
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Dear,
Each coil has two terminal.Say the four coils are aa' , bb' , cc' and dd'.Center tapped common means a'b'c'd' are shorted making a common point.You can call it as a neutral point of a f 4 wire star connected system. You give supply in a, b, c, d in a sequential way and the motor runs.

3. peajay Well-Known Member

Dec 10, 2005
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> four stator windings that are paired with a center-tapped common.

This is just like the two coil motors, except that each coil is center-tapped, so there are six wires coming out of the motor instead of four. That way you connect each center tap to the supply voltage for the motor, then ground each of the remaining four wires in sequence to turn the motor, which is much simpler than having to reverse polarity on the coils like you have to do with the non-center-tapped variety.

You can also drive these motors just like the non-center-tapped variety by simply ignoring the center tap.

May 16, 2005
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