Tech Briefs Magazine - December 2022 - MD3

Best
Practices
to Optimize
Motor Selection
Balancing torque, speed, and inertia for optimal application performance.
O
ptimizing motor
selection for
motion control applications can
have significant performance,
cost, and maintenance benefits. Select
too large a motor and you could overwhelm
your actuators and incur unnecessary
equipment and energy costs.
Select too small a motor and you may
not achieve the torque and speed you
need for effective performance.
The first thing to note about motor
selection is that it is initially not about
the motor. Thinking about whether you
need a servo or stepper motor, DC or AC
synchronous or some other type of
motor without detailing your application
requirements can be a wasted exercise
or could lock you into one type or
another, limiting your options for cost
and performance optimization.
Start with the Application
Typical motion applications include
belt-driven conveyors, index tables or
rotary devices, robotic arms, gates, and
Motion Design, December 2022
automated guided vehicles. Whatever
your application, before you start looking
through motor specs, you must determine
the load on all axes, the degree
of precision you require and
amount of control you need over the
process. Every mechanism is a little bit
different, and there are a wide variety
of ways to calculate the motor requirements.
Hand calculations are good for
simple systems and most manufacturers
provide motor sizing tools for their
various products.
Another critical parameter is the
amount of available bus voltage. Voltage
correlates with high speed and lower
machine cycle time. If your application
calls for more speed than your available
voltage can support, you will need a different
winding and rotor configuration.
Other factors that should be addressed
early in the selection process
are the location of the motors and the
expertise available to make and implement
the selection. Location is critical
because installation in dirty or extreme
temperatures will negatively impact
ultimate performance and drive
up maintenance costs. Having the
right expertise available is important
because, if you do need outside assistance,
the later you bring it into the
process, the more costly it will be and
the more cycles you will have spent up
to that point.
Turning to the Motor
Once application requirements for
load, precision, voltage, and other variables
have been determined, attention
can turn to identifying the motor speed,
torque, and inertia you will need to meet
them. Figure 1 shows the relationship
between torque and speed of a servo
motor. The motor must have the right
speed and torque to hit the operating
point defined by your control requirements.
If your application requires
movement at speed X with Y torque, the
average of the maximum and minimum
3

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
Tech Briefs Magazine - December 2022 - 1
Tech Briefs Magazine - December 2022 - 2
Tech Briefs Magazine - December 2022 - 3
Tech Briefs Magazine - December 2022 - 4
Tech Briefs Magazine - December 2022 - 5
Tech Briefs Magazine - December 2022 - 6
Tech Briefs Magazine - December 2022 - 7
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Tech Briefs Magazine - December 2022 - 11
Tech Briefs Magazine - December 2022 - 12
Tech Briefs Magazine - December 2022 - 13b
Tech Briefs Magazine - December 2022 - 12b
Tech Briefs Magazine - December 2022 - 13
Tech Briefs Magazine - December 2022 - 14
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Tech Briefs Magazine - December 2022 - 48
Tech Briefs Magazine - December 2022 - Cov3
Tech Briefs Magazine - December 2022 - Cov4
Tech Briefs Magazine - December 2022 - MDCov1
Tech Briefs Magazine - December 2022 - MDCov2
Tech Briefs Magazine - December 2022 - MD1
Tech Briefs Magazine - December 2022 - MD2
Tech Briefs Magazine - December 2022 - MD3
Tech Briefs Magazine - December 2022 - MD4
Tech Briefs Magazine - December 2022 - MD5
Tech Briefs Magazine - December 2022 - MD6
Tech Briefs Magazine - December 2022 - MD7
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Tech Briefs Magazine - December 2022 - MD19
Tech Briefs Magazine - December 2022 - MD20
Tech Briefs Magazine - December 2022 - MDCov3
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Tech Briefs Magazine - December 2022 - BETCov1
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