Magnetics Business & Technology - January/February 2024 - 20

PRODUCT NEWS
Hall-Based Motor Position Sensor for e-Mobility Designed by Moving Magnet Technologies
Accurate motor position sensors are required to ensure the efficient
and reliable control of electric machines. Various technical solutions
are available but, despite the widespread use of magneto-sensitive
sensors in end-of-shaft configurations, such a technology was not
seen in through-shaft configurations -- until now, says French mechatronics
design firm Moving Magnet Technologies.
MMT has developed an innovative and simple magnetic solution
that consists only of a rotor magnet and two 2D Hall ICs, according
to Antoine Delaporte, research and development engineer with
the company. At its core, the technology uses a specific sinusoidal
magnetization pattern that can be repeated over multiple periods.
The principle already confers an excellent intrinsic accuracy as a
single-probe sensor; however, requirements for motor control are
stricter than for traditional applications, and the accuracy commonly
required is ±1 electrical degree in all conditions. This is where the
second Hall IC and a simple algebraic signal cross-combination
come into play.
Delaporte cites several benefits of such a design:
*
parasitic harmonics in the probe signal
*
Improvement of the accuracy to under ±1 electrical degree
and increased robustness to mechanical tolerances by reducing the
erated by the motor by use of signal cross-combination
*
electric machines
The raw output signals can be fed directly to the electronics used to
drive the electric machine, requiring only simple signal processing.
Alternatively, the signal processing can easily be carried out inside
the position sensor itself to get a standalone device with the desired
communication protocol.
The technology has the benefits of Hall Effect sensors on which
mode, bringing an intrinsic safety state in case of failure
*
Mitigation of the influence of external magnetic fields genPossibility
of single-probe measurement in degraded
Reduced mass and overall dimensions even for large
20 Magnetics Business & Technology * January/February 2024
www.MagneticsMag.com
http://www.MagneticsMag.com

Magnetics Business & Technology - January/February 2024

Table of Contents for the Digital Edition of Magnetics Business & Technology - January/February 2024

Contents
Magnetics Business & Technology - January/February 2024 - Cover1
Magnetics Business & Technology - January/February 2024 - Cover2
Magnetics Business & Technology - January/February 2024 - Contents
Magnetics Business & Technology - January/February 2024 - 4
Magnetics Business & Technology - January/February 2024 - 5
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Magnetics Business & Technology - January/February 2024 - Cover3
Magnetics Business & Technology - January/February 2024 - Cover4
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https://www.nxtbook.com/nxtbooks/webcom/magnetics_2012winter
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