Tech Briefs Magazine - December 2022 - MD6

Open Loop
Drive Sends Power
large also reduces the overall machine
efficiency and raises operating costs. The
larger the motor, the higher cost for
breakers, cables, and other support infrastructure,
and this can cascade upward
throughout the application design.
As an example, consider a multi-axis
system with an XYZ gantry. If you put too
large a motor on the first axis, and it is a
carry-to-carry axis, you are just adding
more mass that must be carried to the
other two axes. This means that the
whole gantry system must be bigger to
support it.
Control Sends
Move Command
Closed Loop
Drive Compares
Actual to Desired
Position and Sends
Power
Motor Moves
A precise measurement of inertia is
also necessary to determine whether
other aspects of the drive system will
benefit from simple changes. Instead of
selecting a motor with higher inertia,
which is physically larger and more expensive,
reducing the lead of the drive
screw, pitch of the belt or a higher gear
ratio may help. These changes reduce
the system inertia seen by the motor.
This is analogous to pushing on a door
at the handle rather than pushing on it
beside the hinge.
Control Sends
Move Command
Feedback Device
Returns Motor Position
Motor Moves
Figure 3: Many of today's motors rely on closed feedback loops that monitor the motor position against its
target position and make constant course corrections. (Image: Thomson Industries, Inc.)
Belt-driven systems are optimal for
high speed but often require gearing
for good motor matches. Each revolution
of the input shaft produces much
greater output than a single rotation of
a ball screw. Where the typical pitch on
a belt-driven system, for example, might
be 150 mm, a comparable ball screw
pitch might be only in the 5 mm to 25
mm range. The smaller the distance the
mechanism moves for each motor turn,
the less inertia the motor sees through
the mechanism, and the less likely is the
need for gearheads to achieve a more
favorable ratio, according to the following
equation:
Inertia Ratio with gearhead =
Inertia Ratio without gearhead/
gearhead Ratio^2
An accurate calculation of the inertia
of each component is key to selecting
the right motor or motor and gearhead
combination.
Figure 4: Electric linear actuators using brushless motors, which offer higher speeds, longer life and less
maintenance, are becoming more common and affordable. (Image: Thomson Industries, Inc.)
6
Smarter and More Efficient Motors
Of course, motion control technology
itself has not been sitting still. Advances
in motor efficiency and electronics improve
selection and may compensate for
match discrepancies to some extent.
Where 10 or 15 years ago, we might be
Motion Design, December 2022

Tech Briefs Magazine - December 2022

Table of Contents for the Digital Edition of Tech Briefs Magazine - December 2022

Tech Briefs Magazine - December 2022 - Intro
Tech Briefs Magazine - December 2022 - Sponsor
Tech Briefs Magazine - December 2022 - Cov1
Tech Briefs Magazine - December 2022 - Cov2
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Tech Briefs Magazine - December 2022 - 13b
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Tech Briefs Magazine - December 2022 - Cov3
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Tech Briefs Magazine - December 2022 - MDCov1
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Tech Briefs Magazine - December 2022 - MD1
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