Rockwell Automation 700-1384-01, User Manual, Page: 104 / 344

Design Guidelines
Transport System Design
104 MagneMotion
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
The smallest magnet array available for use with QSHT motors is 2 cycles (238 mm [9.4 in]).
With a 2 cycle magnet array the recommended maximum Motor Gap (distance between
motors) is 24 mm (see
Downstream Gap on page 70 ).
NOTE: When determining the number of cycles that are required for the magnet array, be
sure to account for the Downstream Gap.
Number of Poles
The number of poles in a magnet array is simply the number of North and South-oriented
poles in the magnet array. The number of poles is always an odd number (see
Figure 3-30 ) as
it includes the half magnets at each end of the array. The number of poles can also be calcu-
lated from the number of cycles (
cycles * 2 + 1).
Magnet Array Width
Magnet arrays are available in several different widths. The application determines the width
that is used.
Regular width arrays are used in applications where the array does not need to be wider than
the motor. These applications are typically when QSHT motors are arranged in a straight line.
Wide arrays are used in applications where the array must be wider than the motor. This array
width is typically used when QSHT motors are arranged in a curve to provide coverage when
there is a misalignment between the motor and the magnet array. This loss of coverage due to
misalignment leads to a loss of thrust.
Magnet Array Forces
As mentioned previously, there is a certain amount of thrust and attractive force available per
magnet array cycle; however, the number of cycles is not the only variable that affects avail-
able thrust. Other variables are the Vehicle Gap and the Downstream Gap. These other vari-
ables and their effect on available thrust are discussed later in this chapter.
Magnet Array Use
The QuickStick HT magnet arrays are intended for use as the QSHT motor secondary as part
of the vehicle only and must not be used for any other purpose.
Protect all magnet arrays on the transport system from debris accumulation. If debris is accu-
mulated, it can get caught between the magnet array and the motor. Any accumulated debris
affects the performance and can damage the cover of the motor or the magnet array, see
Cleaning Magnet Arrays on page 285 .
Proper precautions must be taken when magnet arrays with stainless steel covers that are not
welded are used in wash down applications or in environments where water or fluids are con-
tacting the array. The mounting must secure the array with a suitable form of gasketing to pre-