Warner Stepper Motor

[gtrdude]

Hi,

I need data on an old Warner stepper motor that I removed from an Intergraph
plotter. So far I'm having trouble finding any because Warner is no longer
making these. If you have any suggestions as to where to look that would be
most helpful.

Model No.: SM-024-0035-TG
Part No.: 4020-635-153

It has 6 wires from the motor itself (red, brown, yellow, blue, green
orange)
and 5 wires from the rear part (red, green, brown, white, black)

Could the rear part of the motor be a position encoder???

The motor turns freely, so I'm not really sure what that means.

Thanks for any help

 

[Mark Harriss]

gtrdude wrote:

Hi,

I need data on an old Warner stepper motor that I removed from an
Intergraph
plotter. So far I'm having trouble finding any because Warner is no
longer
making these. If you have any suggestions as to where to look that would
be most helpful.

Model No.: SM-024-0035-TG
Part No.: 4020-635-153

It has 6 wires from the motor itself (red, brown, yellow, blue, green
orange)
and 5 wires from the rear part (red, green, brown, white, black)

Could the rear part of the motor be a position encoder???

The motor turns freely, so I'm not really sure what that means.

Thanks for any help

Nearly missed your post amongst all the perverted offerings
It sounds like a standard 6 wire servo with encoder at the back
athough the encoders I've seen have four wires typically, just
speculation but it may have an extra signal ground wire. Have you
tried looking up the data sheets of the IC's it's connected to
so you can reverse engineer it a bit?.

 

[gtrdude]

Nearly missed your post amongst all the perverted offerings
It sounds like a standard 6 wire servo with encoder at the back
athough the encoders I've seen have four wires typically, just
speculation but it may have an extra signal ground wire. Have you
tried looking up the data sheets of the IC's it's connected to
so you can reverse engineer it a bit?.

Yes you are right. The encoder has 4 wires and a ground wire that is
attached to the chassis of the stepper. Sorry.

I have messed with it a little bit further and found that there are 3 closed
loops in the 6 wires. The fact that the motor spins freely suggests that it
is a variable relucatance motor. But shouldn't the all coils have a common
connection for v.r.? In this motor none of the coils seem to have a common
connection. Anyway, the thing that I am pretty sure about is that it isn't
of permanent magnet construction.

I have tried using 12 volts across each of the coils and it seems to drive
the motor with a reasonable amount of torque. It draws well over 1 amp
which is the max my power supply can offer. I have no idea what the
recommended voltage is for this motor so I'm not game to push it too far.

 

[Mark Harriss]

gtrdude wrote:

Nearly missed your post amongst all the perverted offerings
It sounds like a standard 6 wire servo with encoder at the back
athough the encoders I've seen have four wires typically, just
speculation but it may have an extra signal ground wire. Have you
tried looking up the data sheets of the IC's it's connected to
so you can reverse engineer it a bit?.


Yes you are right. The encoder has 4 wires and a ground wire that is
attached to the chassis of the stepper. Sorry.

I have messed with it a little bit further and found that there are 3
closed loops in the 6 wires. The fact that the motor spins freely suggests
that it
is a variable relucatance motor. But shouldn't the all coils have a
common
connection for v.r.? In this motor none of the coils seem to have a
common
connection. Anyway, the thing that I am pretty sure about is that it
isn't of permanent magnet construction.

I have tried using 12 volts across each of the coils and it seems to drive
the motor with a reasonable amount of torque. It draws well over 1 amp
which is the max my power supply can offer. I have no idea what the
recommended voltage is for this motor so I'm not game to push it too far.

So it actually spins with DC applied?. If it were a 6 wire stepper it
would have a pair of center tapped windings.