NDLI: Testing the Homogeneity of Magnets for Rotary Position Sensors

Content Provider	IEEE Xplore Digital Library
Author	Blagojevic, M. Markovic, N. Popovic, R.S.
Copyright Year	1965
Abstract	Inhomogeneity of the magnetic field around the magnet used in magnetic angle sensors affects the accuracy of the rotary position sensor. The setup for testing the homogeneity of the field of small rotating permanent magnets must meet several conditions, including the following: 1) two-axis magnetic field probe used for the test must be placed very accurately at the centerline of the rotation axis of the magnet; 2) offsets of probe measurement channels must be canceled; 3) magnetic sensitivities of the measurement channels must be equal; and 4) sensitivity vectors of the measurement channels should be mutually orthogonal. In this paper, we describe a procedure that leads to fulfilment of these conditions. To align the probe position with respect to the magnet rotation axis, we roughly scan the magnet, establish a misalignment error function, and then calculate the position of the minimum of this function. The position of the minimum corresponds to the rotation axis. Then, the center of the sensitive spot of the probe is precisely aligned with the axis of rotation, and the corrections of the offsets, amplitude mismatch and shift are done. These corrections are performed using the Fourier analysis of the probe signals. After the probe alignment and the corrections, the homogeneity error is reduced for a factor of 6-7, and the residual error is of the order of the noise of the applied Hall probe.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	5
Page Count	5
File Size	988358
File Format	PDF
ISSN	00189464
Volume Number	50
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic field measurement Probes Magnetic fields Magnetic sensors Rotation measurement Sensitivity Magnetic angular encoder Angular error Hall sensors Homogeneity of magnetic field magnetic angular encoder homogeneity of magnetic field
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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