Tech Briefs Magazine - June 2021 - MD-8

When Selecting a Sensor
for Motor Feedback
Options Abound
n many motion control applications, it
is necessary to know the position,
speed, and perhaps even acceleration
of a motor's rotor or its load. Depending
on the application and design specifics,
the motor controller might need to
know these parameters precisely, approx -
imately, or perhaps not at all. By knowing
the motor situation and rotor status,
the motor controller has a closed-loop
scenario (Figure 1).
Of course, a motor's speed, position,
and acceleration are closely linked.
Because speed is the derivative (time
rate of change) of position and acceleraI
Processor
&
Algorithms
Interface
Drivers
8
Cov
ToC
MOSFETs/
IGBTs
Feedback sensor
& Interface
Figure 1. In many motor management and control
applications, real-time details of the position and/or
speed of the rotor, provided by a sensor assembly,
are critical for effective closed-loop feedback and
thus accurate performance on the objectives.
(Source: Bill Schweber)
tion is the derivative of speed, it is possible
to determine all three factors, even
when knowing just one of them (also
note the complement: speed is the integral
of acceleration and position is the
integral of speed).
However, in practice, this method of
determining associated parameters is
often (but not always) inadequate be -
cause of resolution and noise. For example,
knowing the rotor has completed
another revolution tells you about all
three variables but with very low and usually
unacceptable resolution. Depending
on the application, the resolution and
Motion Design, June 2021

http://www.abpi.net/ntbpdfclicks/l.php?202106TBNAV

Tech Briefs Magazine - June 2021

Table of Contents for the Digital Edition of Tech Briefs Magazine - June 2021

Tech Briefs Magazine - June 2021 - Intro
Tech Briefs Magazine - June 2021 - Sponsor
Tech Briefs Magazine - June 2021 - Band1
Tech Briefs Magazine - June 2021 - Band2
Tech Briefs Magazine - June 2021 - Cov1
Tech Briefs Magazine - June 2021 - Cov2
Tech Briefs Magazine - June 2021 - 1
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Tech Briefs Magazine - June 2021 - Cov3
Tech Briefs Magazine - June 2021 - Cov4
Tech Briefs Magazine - June 2021 - MD-Cov1
Tech Briefs Magazine - June 2021 - MD-Cov2
Tech Briefs Magazine - June 2021 - MD-1
Tech Briefs Magazine - June 2021 - MD-2
Tech Briefs Magazine - June 2021 - MD-3
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Tech Briefs Magazine - June 2021 - MD-8
Tech Briefs Magazine - June 2021 - MD-9
Tech Briefs Magazine - June 2021 - MD-10
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Tech Briefs Magazine - June 2021 - MD-23
Tech Briefs Magazine - June 2021 - MD-24
Tech Briefs Magazine - June 2021 - MD-Cov3
Tech Briefs Magazine - June 2021 - MD-Cov4
Tech Briefs Magazine - June 2021 - ST-Cov1
Tech Briefs Magazine - June 2021 - ST-Cov2
Tech Briefs Magazine - June 2021 - ST-1
Tech Briefs Magazine - June 2021 - ST-2
Tech Briefs Magazine - June 2021 - ST-3
Tech Briefs Magazine - June 2021 - ST-4
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Tech Briefs Magazine - June 2021 - ST-8
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