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| Magnets • Materials • Manufacturing |
Lord Corporation Magnetorheological (MR) Fluid for Automotive Damping Systems
Lord Corp., after committing more than a decade of intense R&D, holds the world's most extensive patent portfolio on MR fluid formulations, devices and systems. The company has developed additives, lubricants and suspension aids to keep iron particles in place while preventing them from grinding away at seals, gaskets and metal components. The company has also compiled a body of scientific data through aggressive life cycle testing and installed commercial applications that clearly demonstrate the effectiveness, durability and performance of MR fluids, devices and systems.
LORD Corporation |
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Lower Cost Magnetic Encoders Solve Encoder Problems for Motor Manufacturers
Magnetic encoders have been typically reserved for heavy-duty industrial applications: Large and costly, they have long been the kings of encoders, not the foot soldiers used to fit common applications. These applications have been reserved for optical encoders due to price considerations. Recent technological developments have brought magnetic encoders to unprecedented price points, but not all designs share the high reliability and high performance of their high-quality ancestors.
Avtron Manufacturing, Inc. |
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| Application • Component Developments |
Magnetic Winding Optimization Using
Hyper-X Magnetic Technology
This white paper introduces a novel magnetic coil technology that can significantly reduce
dissipation and improve efficiency of magnetic components by optimizing winding parameters.
As consumer demands and system requirements continue to push the need for smaller
components, optimization of magnetic windings becomes a critical step to achieve overall
system miniaturization. Hyper-X Magnetic Technology (“Hyper-XMT”) is a patent-pending
method to achieve these goals.
Tabtronics |
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Perpendicular
Magnetic Recording Technology
An exciting new magnetic recording technology has been
introduced into hard drive storage. Perpendicular magnetic
recording (PMR) offers the customer higher capacities,
improved reliability and robustness, and a very positive
outlook for future growth in capacity and performance.
Through the efforts of a company-wide taskforce, Hitachi’s
first PMR drive, Travelstar 5K160, achieves best-of-breed
performance and quality and is well positioned to ramp
seamlessly to high volume production. Drive development
incorporated a year-long field test that successfully
demonstrated the viability of Hitachi’s advanced
design. Core technologies include second-generation
trailing-shield heads and advanced granular cobalt-chromium-platinum
(CoCrPt) oxide media. Jointly optimized head and media
designs, as well as advanced system integration, resulted
in very high performance with sharp write field gradients,
resistance to stray fields, and excellent media magnetic
and mechanical stability. Hitachi is an intellectual
property leader in perpendicular magnetic recording,
and has more than fifty patent-pending technologies
in the Travelstar 5K160.
Hitachi |
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Magnetoresistive
Random Access Memory
Magnetoresistive Random Access Memory (MRAM) combines
a magnetic device with standard silicon-based microelectronics
to obtain the combined attributes of non-volatility, high-speed
operation and unlimited read and write endurance not found
in any other existing memory technology. In this paper
we provide an overview of Freescale’s MRAM technology
and describe the MR2A16A, a 4 Mbit MRAM device. As shown
in Figure 1, the memory is based on a 1-transistor, 1-magnetic
tunnel junction (1T1MTJ) memory cell that employs a novel
bit structure and approach for operation. The MR2A16A
is fabricated with a 0.18µm CMOS process using five
levels of metal, including program current lines clad
with highly permeable material for magnetic flux concentration.
We describe how the cell architecture, bit structure,
and the toggle switching mode are combined to provide
significantly improved operational performance and manufacturability
as compared to MRAM based on conventional switching.
Freescale Semiconductor,
Inc. |
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IBM's
New Magnetic Hard-Disk-Drive Media Delays Superparamagnetic
Effects
IBM is mass-producing and shipping in its latest Travelstar
products a revolutionary new magnetic data storage media
for hard-disk drives. Developed by IBM Research, this
new magnetic media uses multilayer interactions and is
expected to permit longitudinal recording to achieve a
future data density of 100 gigabits/inch2 -- four times
the data density of today's products -- without suffering
from the projected data loss due to thermal instabilities.
This new media, called antiferromagnetically coupled (AFC)
media, will thus delay for several years the impact of
superparamagnetism in limiting future areal density increases.
It also requires few changes to other aspects of the hard-disk-drive
design, and will surely push back in time the industry's
consideration of more complex techniques proposed for
very high-density magnetic recording, such as, perpendicular
recording, patterned media or thermally-assisted writing.
IBM |
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Eliminating
Damage from Motor Shaft Currents Through Tachometers and
Encoders
Since the introduction of variable speed electronic
controls for DC and AC motors, users have noted a troubling
problem; voltage potential is sometimes induced on the
shaft of the motor. The resulting current can discharge
through gearbox bearings, through the motor bearings,
or through the encoder or tachometer attached to the motor.
This discharge causes the premature failure of motor bearings
and/or encoder bearings. This paper discusses the phenomenon
of encoder and motor damage due to motor shaft currents
through encoders, and proposes several remedies.
Avtron Manufacturing,
Inc. |
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PoEJack
The PoEJackTM -series is a family of products designed
to be used in Power over Ethernet (PoE) Powered-device
(PD) applications such as Voice over IP (VoIP) phones,
Wireless LAN Access Points, security and web cameras,
Analog Telephone Adapters (ATA), and Point of Sales terminals.
The POEJACKTM-series includes the TMIC1113 device for
802.3af specification power levels and the TMIC1124 device
for either 802.3af or 802.3at pre-specification power
levels. The POEJACKTM-series provides the functionality
required for PoE PD applications. By using innovative
silicon solutions built with standard CMOS technology.
This enables its customers to
bring to market higher performance PoE PD products with
low cost and small footprint. The POEJACKTM-series high
level of integration includes rectification and protection
circuitry, PD controller, and DC-DC converter. This high
level of integration provides significant reliability
and protection advantages as well
as simplifies the PoE PD design.
Transtek
Magnetics |
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