Design Guidelines
Transport System Design
70 MagneMotion
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
Motor Gap
For QuickStick HT motors installed in a transport system, there is always a space (Motor Gap)
between motors, as shown in Figure 3-8. The minimum space is 2 mm (for thermal expan-
sion), with typical spacing placing 1 m QuickStick HT motors on a 1 meter pitch.
Figure 3-8: Motor Gaps
Downstream Gap
An additional measurement between motors is the distance from the last block of the stator in
one motor to the first block of the stator in the next motor downstream. This space is referred
to as the Downstream Gap (shown in Figure 3-8) and includes the distance inside each motor
from the end of the stator to the end of the motor housing. The Downstream Gap varies based
on the length of the QSHT motors being used as shown in Figure 3-9.
NOTE: It is recommended that the maximum Downstream Gap between motors is 10% of
the magnet array length. When a dual-array vehicle is used, it’s 10% of the length of
one of the arrays. Larger gaps are possible, but cause greater loss of thrust. When
using larger gaps and dual-array vehicles, the gap between motors must not be larger
than the length of one magnet array. Contact ICT Customer Support for additional
information.
The Downstream Gap affects the force available for vehicle motion between motors. There is
a certain amount of thrust available per magnet array cycle, providing that the magnet array
cycle is located above the motor (magnet array coverage). There must be enough thrust to
move the vehicle past the gap between motors. Do not locate process stations within the gap
between motors as settling time and repeatability are negatively affected.
NOTE: The QuickStick HT motors do not compensate for the amount of thrust that is lost
when the magnet array is over the Downstream Gap. This means that if the array
only has half coverage as shown in Figure 3-7 the effective PID values and peak
thrust are halved and the system does not perform as it would with full coverage.
Motor Gap
Downstream Gap
QuickStick HT Motor
Motor Block
Vehicle Gap
(Motor Gap + 3 mm per 1 m Motor)
(side view)
Upstream Downstream
(Motor Gap + 4 mm per 1/2 m Motor)
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