Magnetics Business & Technology - July/August 2019 - 12
FEATURE ARTICLE
Tech Briefing: Diametrically-Magnetized Magnets - Perfect for Magnetic Angle &
Rotation Sensing
By Daniel A. Baker, NVE Corporation
Diametrically-magnetized magnets have the poles on opposite
sides of the magnet diameter, making them perfect for magnetic
angle and rotation sensing (see Figure 1).This magnetization
direction differs from conventional axially-magnetized disk magnets that have the north pole on one face and the south pole on
the other. This orientation is often ideal for proximity sensing
Magnetic angle sensing applications include robotics,
mechatronics, flow meters, man-machine interfaces
such as knobs, automotive applications including cam/
crank-shaft position and small motor controls such as
power seats.
Magnet Materials
Diametrically-magnetized rare-earth magnets, such as
neodymium iron boron (NdFeB), are used with semiconductor angle sensors such as Hall-effect sensors.
These rare-earth magnets are expensive but have high
magnetic energy products for high field strengths and
low remanent magnetization temperature coefficients so
they are fairly temperature stable.
Figure 1. Magnetic angle sensor
Wide Range of Applications
Compared to other technologies, magnetic angle sensors
are accurate, noncontact, full 360-degree rotation, low
power, and provide absolute (not just relative) position.
Ferrite diametrically-magnetized magnets are used in
high-volume, low cost applications such as wall clock
movements. Ferrites have lower energy products and
produce smaller magnetic fields and their strength varies
more with temperature, often make them incompatible
with legacy sensors. A new generation of magnetic angle
sensors, however, has enough operating latitude to work
well with these lower cost ferrite magnets.
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Magnetics Business & Technology - July/August 2019
Table of Contents for the Digital Edition of Magnetics Business & Technology - July/August 2019
Magnetics Business & Technology - July/August 2019
Contents
ABB Powers Tourists to Niagara Falls with First US-Built All-Electric Vessels, Equipped with Both Permanent- Magnet and Inductive-Magnet Thruster Motors
Toyota Develops New Magnet for Electric Motors Aiming to Reduce Use of Critical Rare-Earth Element by Up to 50%
Race to Develop Electric-Powered Autonomous Aircraft Opening New Market for Permanent-Magnet Motors
Tech Tips: The Economics of a Transformer
Editor’s Choice/ Features
Research & Development
Product News
Industry News
Resource Guide
Marketplace/ Advertising Index
Magnetics Business & Technology - July/August 2019 - Magnetics Business & Technology - July/August 2019
Magnetics Business & Technology - July/August 2019 - Cover2
Magnetics Business & Technology - July/August 2019 - Contents
Magnetics Business & Technology - July/August 2019 - Editor’s Choice/ Features
Magnetics Business & Technology - July/August 2019 - 5
Magnetics Business & Technology - July/August 2019 - Toyota Develops New Magnet for Electric Motors Aiming to Reduce Use of Critical Rare-Earth Element by Up to 50%
Magnetics Business & Technology - July/August 2019 - 7
Magnetics Business & Technology - July/August 2019 - 8
Magnetics Business & Technology - July/August 2019 - 9
Magnetics Business & Technology - July/August 2019 - 10
Magnetics Business & Technology - July/August 2019 - 11
Magnetics Business & Technology - July/August 2019 - 12
Magnetics Business & Technology - July/August 2019 - 13
Magnetics Business & Technology - July/August 2019 - Race to Develop Electric-Powered Autonomous Aircraft Opening New Market for Permanent-Magnet Motors
Magnetics Business & Technology - July/August 2019 - 15
Magnetics Business & Technology - July/August 2019 - Research & Development
Magnetics Business & Technology - July/August 2019 - 17
Magnetics Business & Technology - July/August 2019 - Product News
Magnetics Business & Technology - July/August 2019 - 19
Magnetics Business & Technology - July/August 2019 - 20
Magnetics Business & Technology - July/August 2019 - 21
Magnetics Business & Technology - July/August 2019 - Industry News
Magnetics Business & Technology - July/August 2019 - 23
Magnetics Business & Technology - July/August 2019 - 24
Magnetics Business & Technology - July/August 2019 - 25
Magnetics Business & Technology - July/August 2019 - Resource Guide
Magnetics Business & Technology - July/August 2019 - 27
Magnetics Business & Technology - July/August 2019 - 28
Magnetics Business & Technology - July/August 2019 - 29
Magnetics Business & Technology - July/August 2019 - 30
Magnetics Business & Technology - July/August 2019 - 31
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Magnetics Business & Technology - July/August 2019 - 33
Magnetics Business & Technology - July/August 2019 - 34
Magnetics Business & Technology - July/August 2019 - 35
Magnetics Business & Technology - July/August 2019 - Marketplace/ Advertising Index
Magnetics Business & Technology - July/August 2019 - 37
Magnetics Business & Technology - July/August 2019 - 38
Magnetics Business & Technology - July/August 2019 - Cover3
Magnetics Business & Technology - July/August 2019 - Cover4
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