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Design Guidelines
Transport System Design
20 MagneMotion
Rockwell Automation Publication MMI-UM002E-EN-P - March 2016
Vehicle Gap
The Vehicle Gap, shown in Figure 3-12 , is the distance maintained between the magnet array
and the MagneMover LITE motor. This gap should be maintained throughout the transport
system to ensure consistent operation of the vehicle (the larger the gap the lower the thrust).
Figure 3-12: Vehicle Gap
Standard MM LITE motors have integral rails that ensure a Vehicle Gap of 1 mm ±0.5 mm for
G3 pucks and 1.5 mm ±0.5 mm for G4.2 and later pucks is maintained throughout the Magne-
Mover LITE transport system. When designing a guideway to be used with the MagneMover
LITE railless motors the same gap and tolerance must be maintained to meet the standard
thrust requirements.
The guide rails on which the vehicles move should typically be held flat to within ±0.5 mm,
with a Vehicle Gap of 1 - 2 mm more than the tolerance of the track and vehicle. The greater
the tolerance on the flatness of the guideway the larger the Vehicle Gap must be to ensure the
magnet array never touches the top of the motor.
• A guideway using G3 pucks held to ±0.5 mm should have a nominal Vehicle Gap of
about 1 mm, with a total gap range of 0.5 to 1.5 mm.
• A guideway using G4.2 and later pucks held to ±0.5 mm should have a nominal Vehi-
cle Gap of about 1.5 mm, with a total gap range of 1.0 to 2.0 mm.
NOTE: The Vehicle Gap must be such that any deviations in the flatness of the guide rails
will not allow the magnet array on the vehicle to touch down on either the guide rails
or the motors.
The Vehicle Gap recommendations shown are for reference only. Using a smaller minimum
Vehicle Gap or a larger maximum Vehicle Gap may be possible. However, exceeding the
Vehicle Gap recommendations may make it difficult for the position sensors in the motor to
precisely locate the vehicles. Please contact MMI Technical Support for additional informa-
tion.
• Minimum Vehicle Gap is 0.5 mm, 1.0 mm is the recommended minimum.
• Maximum Vehicle Gap is 2.0 mm, 1.5 mm is the recommended maximum.
Magnet Array
MM LITE Motor
Vehicle Gap