Connections To 8-Lead Motors; Series Connections; Parallel Connections - SUNWIND M542H User Manual

Sunwind Electronics Company Ltd.
Stepper Motor Driver:M542H
Figure 7: 6-lead motor full coil (higher torque) connections

Connections to 8-lead Motors

8 lead motors offer a high degree of flexibility to the system designer in that they may be connected
in series or parallel, thus satisfying a wide range of applications.

Series Connections

A series motor configuration would typically be used in applications where a higher torque at lower
speeds is required. Because this configuration has the most inductance, the performance will start to
degrade at higher speeds. In series mode, the motors should also be run at only 70% of their rated
current to prevent over heating.
Figure 8: 8-lead motor series connections

Parallel Connections

An 8 lead motor in a parallel configuration offers a more stable, but lower torque at lower speeds. But
because of the lower inductance, there will be higher torque at higher speeds. Multiply the per phase (or
unipolar) current rating by 1.96, or the bipolar current rating by 1.4, to determine the peak output current.
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