TMR Sensors: What They Are and How They Benefit Various Applications
Tunnel magnetoresistance (TMR) is a type of magnetic sensing technology which is increasing in use for various types of sensors and applications.
Christian Fell, general manager of Fraba Inc., said TMR is typically comprised of two ferromagnetic layers which are coupled and separated by a very thin non-magnetic, non-conductive insulation layer. Electrons tunnel through this insulation layer to provide a measurement.
Fraba uses TMR for its position sensors due to the high level of accuracy provided by this technology, as well as the many other benefits it offers.
According to Fell, TMR makes it possible to achieve high resolutions similar to those of optical sensors. This is opening up new application opportunities for position sensors such as rotary encoders, including within hydraulic systems utilized in heavy-duty mobile equipment.
In this interview with Power & Motion, Fell overviews TMR sensor designs and the various benefits, as well as possible application uses, of this magnetic sensing technology.
About the Author
Sara Jensen
Executive Editor, Power & Motion
Sara Jensen is executive editor of Power & Motion, directing expanded coverage into the modern fluid power space, as well as mechatronic and smart technologies. She has over 15 years of publishing experience. Prior to Power & Motion she spent 11 years with a trade publication for engineers of heavy-duty equipment, the last 3 of which were as the editor and brand lead. Over the course of her time in the B2B industry, Sara has gained an extensive knowledge of various heavy-duty equipment industries — including construction, agriculture, mining and on-road trucks —along with the systems and market trends which impact them such as fluid power and electronic motion control technologies.
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