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Unipolar/Bipolar Connections (2-Phase Motors)

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

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.