Design Guidelines
Transport System Design
QuickStick HT User Manual
103
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
Physical Length
The physical length of the high flux magnet arrays can be measured using a non-ferrous mea-
suring tool. The physical length can also be calculated, if the number of cycles is known.
The equation to calculate the physical length of a high flux magnet array is:
MagnetArrayLength
= (
Cycles
x 120) - 2 mm
Where:
MagnetArrayLength
– The length of the array, in millimeters.
Cycles
– The number of cycles in the array.
2 mm is subtracted from the overall length to allow ‘stacking’ of magnet arrays
end-to-end.
Magnet Array Length and Attractive Force
There is a strong magnetic attractive force present between the magnet array and the Quick-
Stick HT motor. This force is an important consideration in designing the support structure for
the QuickStick HT transport system and in determining the force that is required to move a
vehicle. The magnetic attractive force is always present, even if there is no power to the
motor. The amount of magnetic attractive force present is also dependent on the length of the
magnet array, see
.
Choose a magnet array length that is no longer than the vehicle length. Based on the applica-
tion, multiple magnet arrays can be used for each vehicle, side-by-side or end-to-end.
Magnet array length is measured in three ways:
•
Number of cycles.
•
Physical length in millimeters.
•
Number of poles.
Number of Cycles
The amount of thrust force and attractive force is reported as force per magnet array cycle.
The more cycles in the magnet array, the greater the thrust and attractive forces. A magnet
array cycle is:
•
The distance from the edge of a half North oriented magnet to the center line of a full
North oriented magnet as shown in
•
The distance from the center line of one full North oriented magnet to the centerline of
the next full North oriented magnet as shown in
.
•
For QSHT magnet arrays, the cycle length is always 120 mm.