Tricks of the trade let designers optimize servo-driven machines for
speed, accuracy, or a quick response. Today's servo-controlled machines
are faster, smaller, and smarter than ever. Even so, machine users
demand more and more performance, and this forces designers to keep
making improvements. But it can be a challenge to make a machine's
servosystem perform better because so many factors come into play:
servomotors, the feedback sensor, the servodrives, and the mechanical
transmission, to name a few. Read more
In one test, a trilobe lobe blower with a 110-kW motor and connected
to a separate frequency converter was compared to a screw blower using a
75-kW motor with integrated frequency drive. The result at maximum
volume flow of the lobe blower (2,145 m3/hr) shows a 32.1%
higher specific energy consumption (lobe: 141.0 J/l, screw 106.7 J/l).
At minimum volume flow (984 m3/hr) the difference in the
specific energy requirements is 64.4 % (lobe: 191.7 J/l, screw 117.2
J/l). Similar results were seen in other tests, demonstrating that
compared to traditional lobe blowers, rotary-screw devices can cut
energy consumption in half. Read more
Electric-motor manufacturers seeking Underwriters Laboratories' (UL)
“explosionproof” certification face a Dec. 11, 2010 deadline that
could change the way they design and build their products. On that date,
UL will require that motors fully comply with the UL 674 standard before
being labeled explosionproof.
Explosionproof does not mean the motor cannot explode or will survive a
catastrophic external explosion. It means the motor will prevent an
explosion or spark from within the motor from propagating into the
surrounding atmosphere, which may contain flammable gases and vapors.
Paul McGrath from Maxon Motor looks at the up and coming trends in
brush and brushless motors. Runtime: 4:28
A new family of frameless brushless motors, the KBM Series, comes in
14 sizes for low or high-voltage operation. Frame sizes range from 60 to
825 mm in diameter, and for 240 to 480-Vac operation. Each frame size is
available with up to three or four stack lengths and feature fully
encapsulated stator windings. Internal windings are rated for
continuous-duty operation up to 155°C. Rare-earth
neodymium-iron-boron magnets provide high continuous torque ranging from
1.07 to 2,540 lb-ft, and peak torque ranging from 3.62 to 9,450 lb-ft,
for maximum power ranging from 1.22 to 24.8 hp. Maximum available speeds
are 105 to 18,600 rpm.
The linear shaft motor now offers a new parallel option to simplify
cable management and routing when using multiple motors with one encoder
and one servodrive. Traditional systems require two drives, two
controllers, and two encoders connected together. The parallel option
provides the motors with mirrored cable exit locations (top), as opposed
to standard motors which have identical cable-exit locations
The new 1PH8 family of high-performance induction-motor drives and
servomotors are for heavy-duty machine tool and motion-control
applications. Available in 2.8 to 1,340 kW, the line combines induction
and high-powered servo technologies for greater efficiency and more
precision. A single stator and rotor design lets the modular adaptation
of the various motor options provide design flexibility and cost
The modular motor platform concept offers options such as assorted
bearing designs for increased cantilever forces or increased speeds up
to 20,000 rpm; solid or hollow shaft-design configuration to match the
mechanical interface; forced-air or water-cooled models; induction or
synchronous servomotor design — both feature the same mechanical and
electrical interface; and absolute or incremental encoders built-in for
high-resolution feedback and improved motion control in high power level
ENGINEERINGTV.COM IS ALL NEW!
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Are you designing Smart Energy products? Then you can't miss the
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Attend The Embedded Designers Forum to hear powerful keynote addresses
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ARCHIVED WEBCASTS AVAILABLE FOR FREE VIEWING
Here for a list of archived Machine Design webcasts.
With over 30,000 custom designs and experienced application and design
engineering support, LEESON can react quickly to your production &
Cool Muscle Servos, Your Complete Solution
The Cool Muscle line of integrated AC servos embeds the key requirements
necessary for sustainable machine design into the motor itself. This
seamless integration increases machine efficiency, maximizes energy
distribution, minimizes current consumption, reduces heat generation and
results in longer component and machine life.
Calculate Motor Speed, Torque or Power: The most common units
can be selected to help engineers find the data they need quickly. The
tool is freely available with no registration from Groschopp
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