This specification defines the dimensional and magnetic properties of a multipole magnetic ring for use with the linear position magnetic encoder for off-axis rotary applications. Magnetic Multipole Ring Plastic Ferrite for Sensor
Left Images shows the proper placement of a multipole ring over the Linear Incremental (off-axis) Position Sensor. The centerline of the magnetic ring (median Hall sensor scan path) is located over the Hall array.
The magnetic ring is designed such that the pole length lp matches the required length at the scan path (typically the center) of the ring. The IC is oriented in perpendicular with respect to the rotation center.
The magnetic ring is designed such that the pole length lp matches the required length at the scan path (typically the center) of the ring. The IC is oriented in perpendicular with respect to the rotation center.
Marking
The magnet ring has two marks at the backside:
One mark shows the number of poles (72) the other mark shows a single digit letter (A…F), which is of no relevance.
One mark shows the number of poles (72) the other mark shows a single digit letter (A…F), which is of no relevance.
Mounting the Magnet Ring
The magnet ring may be mounted directly on magnetic or non-magnetic surfaces. When magnetic surfaces are used, the ring may be mounted on top of the surface, but not immersed in a cavity, as this may weaken the magnetic field of the magnet. When mounting the magnet on a non-magnetic surface, either method is acceptable.
Depending on the carrier material, there are several adhesives available to glue the ring to the surface. For general ruggedness and vibration demands, the use of two-component-adhesive (binder + hardener) has proven to be successful in most cases.
A sensor magnet in housing is a permanent magnet that is epoxy encapsulated in a plastic or metal housing that is either cylindrical panel mount or adjustable screw mount, rectangular screw mount, or other custom mounted housing. Our sensor magnet products are used to actuate various magnetic reed sensors, hall effect sensor, and magnetic reed switches. The magnet is typically mounted to the moving part while the sensor or switch is mounted to a fixed surface.
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