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.
Connections
Resistance (Ohms)
Inductance (mH)
Current (A)
Voltage (V)
Holding Torque (oz-in)
Unipolar
Same as NamePlate
Same as NamePlate
Same as NamePlate
Same as
NamePlate
Same as NamePlate
Bipolar Series
NamePlate
X 2
NamePlate
X 4
NamePlate
X 0.707
NamePlate
X 1.414
NamePlate
X 1.414
Bipolar Half Coil
Same as NamePlate
Same as NamePlate
Same as NamePlate
Same as
NamePlate
Same as NamePlate
Bipolar Parallel
NamePlate
X 0.5
Same
as NamePlate
NamePlate
X 1.414
NamePlate
X 0.707
NamePlate X 1.414
Driver
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
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.
