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unipolar everything is shorted?

P

Phil

Jan 1, 1970
0
Hi, I am connecting a unipolar stepper motor. to check my
connections, I used a continuity tester. I found out that all the
wires were shorted!. On further inspection, I found out hte
centertaps are connected together by my controller board - hence
shorting all the windings. Is this supposed to happen?
 
R

Roger Hamlett

Jan 1, 1970
0
Phil said:
Hi, I am connecting a unipolar stepper motor. to check my
connections, I used a continuity tester. I found out that all the
wires were shorted!. On further inspection, I found out hte
centertaps are connected together by my controller board - hence
shorting all the windings. Is this supposed to happen?
Probably...
You don't give enough of a description to really be sure. However unipolar
steppers, in most cases, will have four windings, which all have to be
connected to the 'common' rail at one end. The commonest configuration
(actually designed so the motor can also be used in bipola mode), is two
'pairs' of windings, each with a centre tap, and these taps are connected
together. The other end of each winding, then goes to the four driver
sources. The resistance of each winding may be quite low (anything from
perhaps 200R, on a 'small' motor, down to possiblty 1.5R, on larger
motors. Most normal 'continuity testers', will see resistances at the
lower end of this, as a 'short'.
You need to identify the type of motor, and then get the data sheet, to
see how the connections are done.

Best Wishes
 
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