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8-wire stepper motor

  • Thread starter Marco Trapanese
  • Start date
M

Marco Trapanese

Jan 1, 1970
0
Hello,

I have a stepper motor with 8-wire. My board need to drive bipolar
stepper. So I can connect the phases in series or in parallel.

What are the differences in the two cases?

I need to move the motor as fast as possible for 30-40 steps. The load
is very light. Which configuration should I use?

Thanks
Marco / iw2nzm
 
M

Marco Trapanese

Jan 1, 1970
0
Marco said:
What are the differences in the two cases?

Well, if I'm not wrong the series connection gives higher torque but
lower speed due to the higher inductance. Parallel connection of the
windings is suitable for high speed application.

Marco / iw2nzm
 
Well, if I'm not wrong the series connection gives higher torque but
lower speed due to the higher inductance. Parallel connection of the
windings is suitable for high speed application.

It all depends on the current you power supply can deliver, and the
voltage it can generate across the windings.

Putting the coils in parallel means that you have to supply twice as
much curret to generate the same torque, but the back-emf (in voltage
per radian per second) is halved. Obviously, the inductance of the two
coils in parallel is only a quarter of that of the two coils in
series, so the time (and/or voltage) required to change twice the
curent through the parallel coil) is halved.

If the driver can't deliver the higher current required by the
parallel connection, it's speed advantage over the serial arrangement
is purely theoretical.

Note the the back emf consant (in volts per radian per second) is - at
least in theory - exactly the same as the torque constant in newton
metres per amp (from conservation of energy).
 
M

Marco Trapanese

Jan 1, 1970
0
It all depends on the current you power supply can deliver, and the
voltage it can generate across the windings.

Putting the coils in parallel means that you have to supply twice as
much curret to generate the same torque, but the back-emf (in voltage
per radian per second) is halved. Obviously, the inductance of the two
coils in parallel is only a quarter of that of the two coils in
series, so the time (and/or voltage) required to change twice the
curent through the parallel coil) is halved.

If the driver can't deliver the higher current required by the
parallel connection, it's speed advantage over the serial arrangement
is purely theoretical.

Note the the back emf consant (in volts per radian per second) is - at
least in theory - exactly the same as the torque constant in newton
metres per amp (from conservation of energy).


Thank you for your answer!

Marco / iw2nzm
 
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