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Magnetic Rotary Encoders Approved for Speed

By Design World Staff | August 6, 2008

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By Desing World Staff

The FIA (Federation Internationale de  L‚’Automobile) recently certified Renishaw RM22 encoders for all levels of motor racing, including Formula 1.  Standard versions of these magnetic encoders can be used for by-wire systems in automobiles, off-road vehicles, lift equipment, defense applications and marine vessels. In addition to handling extreme conditions, these encoders provide by-wire feedback on wheel speed, steering and gearbox data.

The custom high-temperature versions of this magnetic encoder are confirmed for speed and position control. They provide ‚±0.5‚° accuracy at speeds to 60,000 rpm and temperatures up to 170‚°C for extended periods. An earlier custom version of the RM22 was run by an F1 team in 2007.

aug dn3 one.jpg

Salakazi Racing of Finland, Europe‚’s fastest drag racing motorcycle team, uses special RM22 encoders to monitor crankshaft position and clutch speed to reduce wheel spin when accelerating to speeds in excess of 300 km/h. They also use these encoders in Formula 1 racing.

The non-contact, solid-state encoders are available in 7-bit to 13-bit models and industry-standard absolute, incremental, or linear output formats.  Resolution positioning is up to 8,192 cpr.  Standard models are rated for speeds to 30,000 rpm and temperatures from -40‚°C to 125‚°C. 

The non-contact, two-part design imparts frictionless, wear-free, low-inertia operation and removes the need for seals or bearings, simplifying installation and ensuring long-term reliability. The compact encoder body is 22 mm in diameter and provides dirt immunity to IP68. The encoder comprises a magnetic actuator mounted on a shaft and separate metal-shell encoder body. Rotation of the magnet is sensed by a custom chip inside the encoder body and is processed to give the required output format.

Renishaw Inc.
www.renishaw.com

::Design World::


Filed Under: Automotive, Encoders (rotary) + resolvers, Motion control • motor controls

 

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