M542C Full Digital Stepper Drive Manual V2.0
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Figure 6: 6-lead motor full coil (higher torque) connections
4.4 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.
4.4.1 Series Connections
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
4.4.2 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.
Figure 8: 8-lead motor parallel connections
4.5 Power Supply Selection
The M542C can match medium and small size stepping motors (frame size from NEMA 17 to 23) made by Leadshine
or other motor manufactures around the world. To achieve 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 driven motor (particularly at lower speed). Higher
supply voltage will allow higher motor speed to be achieved, at the price of more noise and heating. If the motion
speed requirement is low, it’s better to use lower supply voltage to decrease noise, heating and improve reliability.
4.5.1 Regulated or Unregulated Power Supply
Both regulated and unregulated power supplies can be used to supply the drive. However, unregulated power supplies
are preferred due to their ability to withstand current surge. If regulated power supplies (such as most switching
supplies.) are indeed used, it is important to have large current output rating to avoid problems like current clamp, for
example using 4A supply for 3A motor-drive operation. On the other hand, if unregulated supply is used, one may use
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