Motors & Drives
Boosting the reliability of rotating equipment
is being placed on reducing contamination in the bearing environment. Bearing Isolator technology, originally developed by Inpro/Seal in 1977, has been an integral part of increasing the mean time between repair (MTBR) and improving the reliability of a variety of rotating equipment. The Inpro/Seal Bearing Isolator is a two
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part dynamic seal consisting of a stator, most commonly press-fitted into the bearing housing, and a rotor attached to the shaft. The rotor and stator join together to form a non- contacting compound labyrinth seal with no wearing parts. It protects in two ways: bearing lubricant is captured in the inner portion of the labyrinth and flows back to the bearing housing; outside contamination attempting to enter the bearing housing is captured in the outer labyrinth paths and expelled
s end-users of rotating equipment seek to extend the life of these applications, increasing emphasis
through a port in the rotor by centrifugal force and gravity. The Bearing Isolator was invented to
replace lip seals as a sealing solution in industrial process equipment, such as pumps, motors, gearboxes, pillow blocks and other types of rotating equipment. Because of their contacting design, friction against the shaft limits the life span of lip seals to approximately 3000 hours. Alternatively, an Inpro/Seal Bearing Isolator lacks any wearing parts thereby sealing the bearing for the life of the equipment. The original Bearing Isolators had been in service for more than 25 years when the pump line on which they were installed was finally taken out of service. Currently there are over 4 million Bearing Isolators installed worldwide. l
Enter 20 or ✔ at
www.engineerlive.com/ies
Fig. 1. Bearing Isolator Technology has consistently increased reliability in motors, pumps, gearboxes, pillow blocks and other rotating equipment applications.
Inpro/Seal LLC is based in Rock Island, Illinois, USA.
www.inpro-seal.com
New range of sensorless brushless DC (SBLDC) gearmotors
increased design life for their equipment, Bison Gear & Engineering Corp is introducing a new line of sensorless brushless DC (SBLDC) parallel-shaft gearmotors with powers up to 124W (1/6HP). The new 34 frame Autonomotor gearmotors are powered by totally enclosed, non-ventilated (TENV) brushless motors that are sensorless to reduce cost, size and wiring complexity while offering improved reliability and noise immunity compared to brushless motors with shaft- mounted rotor position sensors. Employing modern DSP technology
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that facilitates the implementation of sensorless control algorithms and eliminates the need for position sensors (and associated wiring) required in conventional BLDC motor-control systems, Bison’s new low-voltage Autonomotor gearmotors are offered in eleven standard versions with gear ratios from 5:1 to 215.6:1 and rated output speeds from
20
www.engineerlive.com
n response to OEMs seeking higher energy efficiency and power density as well as simpler assembly and
470 to 11rpm with a 10:1 speed range. Speed can be adjusted with either a supplied potentiometer or a 0-5V DC signal. Continuous output torques range from 2.1 to 33.9Nm (19 to 300 in-lbs). The gearmotors use all-steel gearing and oil bath lubrication for a long operating life. Suitable for factory automation,
packaging equipment, foodservice equipment, alternative energy systems, stationary agricultural equipment and other machinery, the Autonomotor gearmotors are part of Bison Gear’s In-Stock, Instant-Ship programme that supports Bison’s distribution partners and offers same-day shipment. Matt Hanson, vice president of
portfolio management at Bison Gear, states: “The National Science Foundation grant awarded to Bison in 2005 for research on higher efficiency electric motors paved the way for this innovative new brushless DC development. l
For more information, visit
www.bisongear.com
Miniature inductive rotary encoder works with gear teeth
scanning. The encoder head measures only 9.0 x 6.8mm, with a thickness of 0.9mm, and provides A and B pulses in quadrature. The pulse-frequency ranges from zero up to 200kHz. The extremely small dimensions enable the encoder to be integrated inside spindles, drives and electric motors. The encoder scans gear teeth of different materials with modules 0.4 to 0.7. In order to achieve the best possible resolution, a pulse- multiplication factor ranging from x1 to x64 can be selected. The main features of this encoder are said
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to be its extremely small dimensions and its insensitivity to dust, water, oil, grease and even magnetic fields. l
For more information, visit
www.posic.com
sosic is launching a miniaturised inductive rotary encoder, known as the ID1101G, for gear-wheel
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