PSR8078 User Manual
REV1.0 5
5. Connecting the Motor
The stepper drive PSR8078 can drive any 2-pahse and 4-pahse hybrid stepping motors.
5.1 Connections to 4-lead Motors
4-lead motors are the least flexible but easiest to wire. Speed and torque will depend on
winding inductance. In setting the drive output current, multiply the specified phase current
by 1.4 to determine the peak output current.
Figure 4: 4-lead Motor Connections
5.2 Connections to 6-lead Motors
Like 8-lead stepping motors, 6-lead motors have two configurations available for high speed
or high torque operation. The higher speed configuration, or half coil, is so described
because it uses one half of the motor’s inductor windings. The higher torque configuration, or
full coil, uses the full windings of the phases.
5.2.1 Half Coil Configurations
As previously stated, the half coil configuration uses 50% of the motor phase windings. This
gives lower inductance, hence, lower torque output. Like the parallel connection of 8-lead
motor, the output torque will be more stable at higher speed. This configuration is also
referred to as half chopper. In setting the drive output current multiply the specified per phase
(or unipolar) current rating by 1.4 to determine the peak output current.
Figure 5: 6-lead motor half coil (higher speed) connections
PSR8078 User Manual
REV1.0 6
5.2.2 Full Coil Configurations
The full coil configuration on a 6-lead motor should be used in applications where higher
torque at lower speed 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 6: 6-lead motor full coil (higher torque) connections
5.3 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.
5.3.1 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
