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Spintronics developer NVE has launched a versatile new series of tunnel magnetoresistance sensors that can be applied as rotary encoders or linear motion sensors. Creating a new range of options for design engineers, the new AET-Series of TMR off-axis rotational-linear sensors are the world’s only TMR encoder sensors, says the company.
They can be used with multipole ring magnets as rotary encoders or with magnetic scale tapes as linear motion sensors. High sensitivity allows for wide airgaps and accommodates mechanical tolerances. They feature simple interfaces and provide extremely high precision.
Standard AET-Series sensors are designed for pole pitches from 0.5 to 5 mm. Custom spacings are also available. Typical resolution is one one-thousandth of the pole pitch, or as little as 0.5 microns for linear motion sensing and 0.02 degrees for rotation sensing with a 16-pole ring magnet.
Half-bridge versions offer simplicity and miniaturization. Full-bridge versions provide twice the output signal and maximize noise immunity. Sine and cosine outputs provide direction information. Typical output amplitude is 200 millivolts peak-to-peak per volt for half-bridge versions and 400 millivolts peak-to-peak per volt for full-bridge versions. The large output signals allow direct interface to common microcontrollers with no amplification.
Key applications include rotary encoders; linear motion sensors; motion, speed, and position sensing; closed-loop servos; and automotive sensors.
Based in Eden Prairie, Minnesota, NVE is a leader in the practical commercialization of spintronics, a nanotechnology that relies on electron spin rather than electron charge to acquire, store and transmit information. The company manufactures high-performance spintronic products including sensors and couplers that are used to acquire and transmit data. For more info, see www.nve.com.