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Halloween is just around the corner, but even scarier are the rising
energy costs for business and industry. On top of that, new regulations
that address motor operation and efficiency are right around the corner.
Instead of replacing that motor, a variable ac drive might help cut that
motor's energy diet. Then, new motor controls monitor and record many
facets of motor operations for a more complete history of motor life.
The use of servo and stepmotors in industrial areas is on the rise, as
they offer several unique abilities beyond standard motors. But
stepmotors are prone to a condition known as resonance which limits how
they perform, so read about those techniques that eliminate this
performance-robbing effect.
-- Robert Repas
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A drive and motor constitute a constant torque system. That means
torque is available from very low speeds up to the motor's rated
nameplate speed. This varies sharply from a constant hp system where
lower speeds mean higher torque capacities. Simply put, you can't expect
an ac drive to be an electronic gearbox.
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BRUSHLESS MOTOR W/ INTEGRATED
GEARING
 Our Integrated
Brushless Gearmotor incorporates gearing into the body of the DC motor,
improving efficiency while reducing size and noise levels.
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The North American Operating Div. of Schneider Electric held Initi@tive 2008 this past August in Las
Vegas. One of the items on display was the TeSys T Motor Management
System by Telemecanique that combines primary motorprotection needs with
the ability to record motor history, statistics, and timestamped faults,
thus giving a real-time view of motor operation.
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Once relegated to light duty in the most protected environments,
servo and stepmotors are lacing up their steel-toed boots and venturing
out onto the plant floor. Here, they are setting productivity records,
but not without some serious forethought.
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Every stepmotor has a resonance spot. For each step that the motor
takes, the rotating part, or rotor, oscillates around the new position
before coming to a stop. The result is a motor that vibrates and has
jitter. Mindy Cheng from Lin Engineering looks at the cause of stepmotor
resonance and some of the many techniques used to minimize the problem.
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Want to take the in-wheel electric motor concept cars like iReal or
Pivo off roading? NASA is developing ATHLETE (All-Terrain Hex-Limbed
Extra-Terrestrial Explorer) which has in-wheel electric motors as the
"foot pads" for mechanical legs. The advantage to this set-up is the
small in-wheel electric motors are ideal for transport on flatter
surfaces while the robotic legs are better for rougher surfaces.
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The DRL Series of linear actuators is said to offer accuracy in a
small package. The actuator frame size is 1.2-in. square. It uses a
five-phase stepping motor and ground ball screw to provide consistent
position accuracies of 0.005 mm (0.0002 in.)
Oriental Motors Corp.
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Linear Shaft Motor Stage SCR100
 The SCR100
stage, is a 100mm wide, ultra high precision, compact single axis stage
that integrates a slide guide, encoder, and Linear Shaft Motor. The
SCR100 offers a wide range of advantages for ultra high performance and
accuracy applications. The SCR100 is a moving magnet design, which
locates all cables and connectors in the stationary base. The resulting
absence of any moving cable is clean and compact and eliminates motion
errors due to cable forces. The precision ground cross roller way
provides high stiffness and smooth motion. Together they are capable of
supporting higher torque levels due to offset loads with travels from
50mm to 300mm. The SCR stage is also available in widths of 50mm, 75mm,
and 150mm.
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The high-precision integrated motor-encoder assembly has a large
diameter clear aperture with integral high-resolution encoder. The unit
uses ABEC7-class precision ball bearings and has a tightly toleranced
hollow-shaft for optical applications requiring a large diameter clear
aperture.
BEI Kimco Magnetics
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RoHS-compliant integrated connectors for Size-14 hybrid linear
actuators are offered alone or with a harness assembly. The connector
has a positive latch for high connection integrity, is rated to 3 A, and
its mating connector handles wire gauges from 22 to 28 AWG.
Haydon Switch & Instrument Inc.
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Rev up your interdisciplinary design skills
What happens when a microcontroller turns on a power FET, sending a
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seal machine installed on a potato chip line at a Frito Lay plant in
central California? And how can you be sure that the encoders, prox
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And will the signals get through the networks fast enough, without being
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Begin your search here with a collection of
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CAD Library offers advanced CAD Resources
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UPCOMING IN-PERSON EVENTS
Design-2-Part Shows are America's longest running and most trusted
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Ten shows covering the country offer OEMs, engineers and purchasing
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UPCOMING WEBCASTS
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Introduction to Linear Actuators
Sponsored by HaydonKerk Motion Solutions
DATE: November 13th, 2008
TIME: 2:00pm ET/11am PT
What is a stepper motor based linear actuator? How does it work? How
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These are questions that will be answered in HaydonKerk Motion Solutions
first technical webinar. Engineering managers Frank Morton and Ray
LaChance explain linear actuators and how they are used to achieve
precision linear motion.
In this webinar:
Basic stepper motor theory
Components that make up a stepper motor-based linear actuator
The selection of a linear actuator based on load, resolution, and
travel requirements
Who should attend:
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ARCHIVED WEBCASTS AVAILABLE FOR FREE VIEWING
Click Here for a list of archived Machine Design
webcasts.
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Zero-Max
The new CD couplings feature zero backlash precision and high torsional
stiffness required in today's demanding servo motor applications with
high reverse loads and positioning requirements. Newly improved CD
couplings are designed with new clamp style hubs for increased torque
capacity on shafts without using keyways.
Now you can select and configure the exact CD® coupling solution for
your coupling application with 3D Partstream, the configurable 3D CAD
downloads at www.zero-max.com
LEESON's new SM2 Vector Series inverters deliver up to 200%
starting torque and control an Inverter rated motor down to 1Hz at full
output torque.
www.leeson.com
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Editorial questions: Robert Repas
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