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Hybrid Stepper Motor Catalogue
MEZ close loop stepper servo systems
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Unipolar/Bipolar Connections (2-Phase Motors)

Connections Resistance
(Ohms)
Inductance
(mH)
Current
 (A)
Voltage
(V)
Holding Torque
(oz-in)
Unipolar Same as Catalog Same as Catalog Same as Catalog Same as Catalog Same as Catalog
Bipolar Series Catalog X 2 Catalog X 4 Catalog X 0.707 Catalog X 1.414 Catalog X 1.414
Bipolar Half Coil Same as Catalog Same as Catalog Same as Catalog Same as Catalog Same as Catalog
Bipolar Parallel Catalog X 0.5 Same as Catalog Catalog X 1.414 Catalog X 0.707 Catalog X 1.414
Customer'sDriver Motor
Choices
What to Do How to Do It End Result
Unipolar
(6 Leads)
6 Lead Motor Use as is
(Unipolar)
  6 Leads
8 Lead Motor Convert to
Unipolar
Tie yellow and orange together and use AND
Tie white and brown together and use
6 Leads
Bipolar
(4 Leads)
6 Lead Motor Convert to
Series
Tape off yellow and white leads and don't use 4 Leads
Convert to
Half Coil
Tape off black and red leads OR
Tape off green and blue leads
4 Leads
8 Lead Motor Convert to
Series
Connect yellow and orange and tape off AND
Connect white and brown and tape off
4 Leads
 Convert to
Parallel
Tie black and orange together AND
Tie yellow and green together AND
Tie red and brown together AND
Tie white and blue together
4 Leads
Convert to
Half Coil
Tape off black, yellow, red, and white OR
Tape off orange, green, brown, and blue
4 Leads

Unipolar and Bipolar Half Coil, because we're using less turns, doesn't give us great low speed torque, but because of the low inductance, holds the torque out to high speeds.

Bipolar Series uses the full coil so it gives very good low speed torque. But because of the high inductance, the torque drops off rapidly.

Bipolar Parallel also uses the full coil so it gives good low speed performance. And its low inductance allows the torque to be held out to high speeds. But remember, we must increase current by 40% to get those advantages.

 

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