Data Sheet

Digital Stepper Drive DM320T
6
Figure 6: 6-lead motor full coil (higher torque) connections
5.3 Connections of 8-lead Motor
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.
5.3.1 Series Connection
A series motor configuration would typically be used in applications where a higher torque at lower speed is required.
Because this configuration has the most inductance, the performance will start to degrade at higher speed. In series
mode, the motors should also be run at only 70% of their rated current to prevent overheating.
Figure 7: 8-lead motor series connections
5.3.2 Parallel Connection
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 phase (or unipolar) current rating by 1.96,
or the bipolar current rating by 1.4, to determine the peak output current.
Figure 8: 8-lead motor parallel connections
6. Power Supply Selection
The DM320T can power medium and small size stepping motors (frame size from NEMA11 to 17). To get good driving
performances, it is important to select supply voltage and output current properly. Generally speaking, supply voltage
determines the high speed performance of the motor, while output current determines the output torque of the