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As the new editor for Motors Monthly, I first want to thank Kelsey
Rubenking for doing an excellent job on the newsletters during her
summer intern position here at Penton. Now that she's back at school,
it's up to me to carry on.
This month takes a look at how piezomotion helps shrink motors yet still
maintains power. Speaking of power, saving it has gone big time with the
passage of the Energy Independence and Security Act that now mandates
efficiency standards for the most common types of electric motors. But
even though Congress mandates, the question arises whether it will be
possible to get the special steels and alloys needed to boost efficiency
to specified levels. The video pick this month looks at an electric toy
motor circa 1910.
— Robert Repas
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Two maxims about today’s technology are that it does more in a
smaller package. Unfortunately, standard electric motors with magnets
and coils don't scale well. Their power drops off noticeably as they
become smaller. Instead of the typical magnet and coil construction,
piezoelectric motors designed for tiny places use piezoceramic compounds
that pull or push armatures into position using direct physical contact.
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With the stroke of a pen, legislators have forced electric motors to
get more efficient. Included in the 310-page Energy Independence and
Security Act of 2007 (EISA) is one important page on Electric Motor
Efficiency Standards that, for the first time, impacts how machine
designers select motors.
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2010 is shaping up to be a hot year for energy efficiency. That’s
when new DOE minimum efficiency requirements kick in for both medium-
voltage dry-type and liquidfilled transformers and induction motors. The
only problem: There may not be enough steel to make NEMA Premium motors
and transformers the new standards call for.
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The video pick this month is a flywheel-enhanced electric solenoid
motor from 1910. Designed originally as a child's toy, it no doubt gave
its owner many fascinating hours of play with this new-fangled
ee-lek-triss-ity.
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The EC16 brushless dc motor from Maxon Precision Motors Inc.
measures 16 × 56 mm, is rated to 40 W, and has a 0 to 60,000-rpm speed
range. Advantages of the motor include high efficiency, no cogging, and
the large linear speed/torque gradient.
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The digital MD plus Series of field-programmable closed-loop drives
from Dart Controls Inc. have an advanced velocity-form PID algorithm for
control of dc motors from 0.02 to 2 hp with a standard universal power
supply input from 85 to 265 Vac. An isolated 4-to-20-mA input/output
signal integrates the drive with existing process-control systems.
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The Movitrac LTE B drive from SEW Eurodrive Inc. simplifies control
of asynchronous motors by adding dynamic braking, better low-speed motor
control and embedded communications. The drive comes in three sizes with
either a standard IP20 (15 hp) or rugged IP55/NEMA 12k (10 hp) housing
for demanding environment.
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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
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capacity on shafts without using keyways.
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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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