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Design Guidelines
Transport System Design
MagneMover LITE User Manual 11
Rockwell Automation Publication MMI-UM002E-EN-P - March 2016
LITE motor) the MM LITE motors provide approximately 6 N [1.3 lbf] thrust per magnet
array cycle (see
Table 3-3 ). The magnet array comes in one length (1 cycle), however two
arrays can be used in a dual array vehicle effectively doubling the length of the magnet array.
Required Thrust
The thrust required to move a vehicle (puck) is determined by several variables:
• Friction or drag between the vehicle and the guideway.
• Mass to be moved.
• Required acceleration.
Motor Gap
For MagneMover LITE motors installed in a transport system where V-Braces are used to
lock the motors together, there will always be a space (Motor Gap) between motors, as shown
in
Figure 3-6 , with the required Motor Gap being 1 mm, which places MM LITE motors on a
1 meter pitch.
Figure 3-6: MagneMover LITE 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, which is referred to as
the Downstream Gap (shown in
Figure 3-6 and is equivalent to the Motor Gap plus 2 mm).
NOTE: MagneMotion recommends 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 may be possible, but will cause greater loss
of thrust. Please contact MMI Technical Support for additional information.
The Downstream Gap affects the force available for moving vehicles 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. Note that process stations should not be
located within the gap between motors as settling time and repeatability may be negatively
affected.
NOTE: The MagneMover LITE motors do not compensate for the amount of thrust lost
when the magnet array is over the Downstream Gap. This means that if the array
Motor Gap (1 mm)
Downstream Gap
MagneMover LITE 1 m Motor
Motor Block
Vehicle Gap
(Motor Gap + 2 mm)
(side view)