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Renishaw: Sealed Magnetic Rotary Encoders
Sealed magnetic encoder.
Hoffman Estates, IL — OnAxis™ magnetic encoders from Renishaw bring high performance, robust armored construction, simple mounting system, small size and low purchase price to demanding motor control, shaft position and velocity measurement applications for OEMs. Part of the company's family of high-performance, industrial-strength encoders, the solid-state On-Axis units have a Hall sensor ASIC epoxy-embedded inside a rugged metal housing.

According to the company, the encoders deliver IP68 sealing, tolerate an extreme temperature range (-40 to +125°C), and provide superior resistance to shock, vibration, G forces and pressures. Non-contact, frictionless, zero-wear operation delivers "fit and forget" reliability.

Designed for easy integration with electric motors and other shaft-drive devices, the encoder ASIC/metal case can be mounted to motor backs, fit into a cast or machined hole, or simply fastened down with two screws. Actuator magnets can be mounted onto or inset into the shaft. No adjustment is needed after mounting. The magnetic encoders are available in analog, incremental and absolute formats with resolutions up to 13 bit (8192 counts per revolution), speeds to over 30,000 rpm, measurement accuracies to 0.5°, and 5V or 24V power supply.

The hard-body sealed encoders reportedly deliver high EMC immunity when shielded according to installation instructions. Units are RoHS compliant, and versions can be ordered for immersion applications (pumps, gearboxes, etc.).

Inside the encoder is a small diametrically polarized magnet and a custom Hall sensor ASIC which contains a circular array of Hall effect sensors that generate a voltage when exposed to a magnetic flux field. The ASIC detects the change in magnetic flux as the magnet rotates above it. Sine and cosine voltage outputs from the sensor array vary with magnetic position and are converted to absolute angle position by a fast flash interpolator. The absolute angle position value is output through a parallel binary interface or a serial SSI interface.

For more information, contact: Renishaw, Inc., 5277 Trillium Blvd., Hoffman Estates, IL 60192 847-286-9953 fax: 847-286-9974 Web: http://www.renishaw.com/encoders

 
 

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