EM882S Digital Stepper Drive User Manual
Motion Control Products Ltd. Tel.: (+44) 01202 599922
5.2 6-lead Motor Connection
EM882S can power 6-lead stepper motors through half coil connection (half chopper) or full coil (full copper)
connection. The half coil connection only uses one half of the motor’s winding and is usually selected in applications
requiring high speed but lower torque. The full coil connection uses the full coil winding and is usually selected in
high-torque required applications. Refer to figure 8 and 9 for those two connections.
P4
P4
Figure 8
6-lead motor half coil connection
Figure 9
6-lead motor full coil connection
5.3 8-lead Motor Connection
EM882S can power 8-lead in series or parallel connection in series or parallel.
Series connected 8-lead stepper motors are typically implemented in applications which higher torque at lower speed
movement is required. Because a stepper motors under series connection has the most inductance, the performance
will start to degrade when the motor runs at higher speed. For this connection, it is suggested to set an EM882S
’s
output RMS current to no more
than 70% of the stepper motor’s phase current to prevent overheating. See the figure
10 for how to connect an 8-lead stepper motor for series connection.
Parallel connected 8-lead stepper motors are typically implemented in applications which higher torque at high speed
movement is required. Compared with series connection, a parallel connected stepper motor has lower inductance
and therefore have better torque performance at higher speed movement. Although setting the drive output current
to 1.4 times of driven motor phase current will get the most torque, it is suggested to set an EM882S
’s output current
(peak of sinusoidal) to no more than 1.2 times the stepper motor’s phase current to
prevent overheating. Refer to the
figure 11 for how to connect an 8-lead stepper motor for parallel connection.
P4
P4
Figure 10
8-lead motor series connection
Figure 11
8-lead motor parallel connection
6. Power Supply Selection
EM882S is designed to power stepper motors (frame sizes NEMA 23 to 34) made by Leadshine or other motor
manufacturers. To get optimal performances, it is important to select proper power supply type, voltage, and supply
output current. In general power supply voltage determines the high speed performance of a stepper motor, while
drive output current determines the driven motor torque output. Higher supply voltage can increases motor speed
torque performance, but at the same time result in more noise and motor heating. For low motor speed applications,
