Full Coil Configurations; Connections To 8-Lead Motors - Motion DMD870 User Manual

DMD870 Digital Stepper Drive User's Manual

Full Coil Configurations

The full coil configuration on a six lead motor should be used in applications where higher
torque at lower speeds is desired. This configuration is also referred to as full copper. In full
coil mode, the motors should be run at only 70% of their rated current to prevent
overheating.
Figure 5: 6-lead motor full coil (higher torque) connections
8-lead Motors Connections
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 6: 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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