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Why is Servo Motor Sizing so important?
The importance of
servo motor sizing should not be underestimated. Proper motor sizing will not
only result in significant cost savings by saving energy, reducing purchasing
and operating costs, reducing downtime, etc.; it also helps the engineer to
design better motion control systems.
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here
to read more...
Motion
Mechanisms' Inertia & Torque Calculations
This page provides all
equations necessary to calculate the inertia and torque of mechanisms like
gears, reducers, timing belts, rack & pinions, conveyors, and leadscrews.
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here
to read more...
Calculation
of Motion Parameters
This page
provides all equations necessary to determine the parameters of a triangular or
trapezoidal motion profile. The equation address velocity, acceleration,
distance and time based on what parameters are known and which need to be
determined. Click
here
to read more...
Holding
Brake and Motor Torque Requirements
The effect of a holding
brake on motor torque requirements is usually minimal in a regular rotary or
linear horizontal motion application and is therefore not necessarily
recommended. However, the torque and power reduction can be quite dramatic in
case of vertical linear applications. Click
here to read more...
Servo
Motor Selection Criteria
The motor data needed to select a motor
are rated speed, rated torque, intermittent torque, and rotor inertia. However,
the best servo motor selection criteria is to use the motor's performance curve
(torque over speed) and to verify it with the application requirements. Not all
motor data sheets do provide such detailed information, since some manufacturers
prefer to define the rated/intermittent torque and the rated speed of their
motors in a more conservatively manner. Under certain conditions it is, however,
possible to operate motors beyond their rated data.
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here
to read more...
Choosing the right PC-based
motion-control system requires evaluating motion controllers, software,
amplifiers, motors, and positioning hardware.
Vision Systems Design - July 2005 -
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here to read more...
Energy-Efficient
Motors Deliver Savings
Initial cost can blur much higher
product lifecycle cost. Industrial electric motors represent a classic example,
since 97-98% of their lifetime operating cost is attributed to electric energy
charges. Yet motors are not typically purchased with efficiency in mind.
Control Engineering July 1, 2005 -
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here to read
more...
Efficient
Motors Can Ease Energy Crunch
Newer and upgraded lines of
energy-efficient ac induction motors provide more choices for today's complex,
costly power management decisions.
Control Engineering May 1, 2001 -
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here to read
more...
Efficiency
to the Masses — of Electric Motors, that Is
The technology is here—and has been
here—but it takes incentive and legislation to raise the efficiency of
industrial motors in a practical way.
Control Engineering July 1, 1998 -
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here to read
more...
Motor
Guide
The cost of energy used by electric motors can be
up to 50 percent of total energy costs in a commercial building, and up to 75
percent of total energy costs in an industrial facility. Because a motor
consumes so much energy, its first year energy costs are generally several times
its purchase price; imagine spending $50,000 a year on gas for your $10,000 car!
When purchasing new motors, it makes sense to invest in premium-efficient models
that drastically cut energy costs over the entire motor lifetime. In addition,
good motor maintenance and motor controls can save even more energy.
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here
to read
more...
When
to Choose a Linear Motor
For rotary or linear motors,
motion is produced the same way and the same basic physics and electromagnetic
forces apply. The theory that produces "torque" in a rotary motor produces
"force" in a linear motor. But a closer look reveals that linear motors provide
unique advantages for motion applications. Click
here
to find out how linear motors work and what the advantages are for motion
applications.
Linear
Motors Hit Their Stride
Once considered expensive
and exotic, linear motors are at last becoming valuable workhorses in a variety
of OEM applications. Besides delivering nanometer precision in the semiconductor
and machine tool fields, linear motors are now meeting the needs of design
engineers in applications that range from medical equipment to packaging,
printing, and even metalworking.
Design News July 18, 2005 -
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here
to read more...
ELECTRIC
MOTORS
Electric motors, both ac motors and dc motors,
come in many shapes and sizes. Some are standardized electric motors for
general-purpose applications. Other electric motors are intended for specific
tasks. In any case, electric motors should be selected to satisfy the dynamic
requirements of the machines on which they are applied without exceeding rated
electric motor temperature. Thus, the first and most important step in electric
motor selection is determining load characteristics -- torque and speed versus
time. Electric motor selection is also based on mission goals, power available,
and cost.
Machine Design - Click
here
to read more...
Getting
torque-to-inertia right
The case of a pulsating-load
testing machine shows how to ballpark qualities that are important for deploying
electric motors.
Machine Design - Click
here
to read more...
AC
Motor - Basics of AC Motor Design Engineering
A synchronous and synchronous electric motors are
the two main categories of ac motors. The induction ac motor is a common form of
asynchronous motor and is basically an ac transformer with a rotating secondary.
The primary winding (stator) is connected to the power source and the shorted
secondary (rotor) carries the induced secondary current. Torque is produced by
the action of the rotor (secondary) currents on the air-gap flux. The
synchronous motor differs greatly in design and operational characteristics, and
is considered a separate class of ac motor. Machine Design - Click
here
to read more.
DC
Motors
Industrial applications use dc
motors because the speed-torque relationship can be varied to almost any useful
form -- for both dc motor and regeneration applications in either direction of
rotation. Continuous operation of dc motors is commonly available over a speed
range of 8:1. Infinite range (smooth control down to zero speed) for short
durations or reduced load is also common. Machine Design - Click
here
to read more...
Stepper
Motor
Stepper motors offer many
advantages. Although feedback is not usually required, stepper motors are
compatible with feedback signals, either analog or digital. Error is
noncumulative as long as pulse-to-step integrity is maintained by the stepper
motor. A stream of pulses can be counted into stepper motors, and the stepper
motor's final position will be known within a small percentage of one step.
Machine Design - Click
here
to read more...
Gearbox
repair & application
Selection and
application of a gearbox is synonymous to that of a motor, since motors drive
most reducers, either directly or indirectly. Over 85 percent of all
general-purpose industrial gearboxes are directly mounted to a motor. Similarly,
if repair work is scheduled for the motor, gearbox repair should be considered
at the same time. Both components are typically operating in the same
environment and are subjected to similar inherent loads. If the performance of
one suffers, the other will probably suffer too. In fact, the failure of the
motor may be a result of misapplication of the reducer and vice-versa.
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here
to read more...
Selecting
and Applying Speed Reducers
Speed reducers are
mechanical devices generally used for two purposes. The primary use is to
multiply the amount of torque generated by an input power source to increase the
amount of usable work. They also reduce the input power source speed to achieve
desired output speeds. Click
here
to read more...(PDF File)
Step
Motor Basics
Conventional AC and DC
motors operate on continuously applied input voltage and most often produce a
continuous (steady state) rotary motion. Unlike these motors, step motor (also
called a stepping motor or a stepper motor) will not produce continuous motion
from a continuous input voltage. It will stay in a particular position as long
as the power is "on". Click
here
to read more...(PDF File)
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