By Desing World Staff
The FIA (Federation Internationale de L‚â€™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 ‚Â±0.5‚Â° accuracy at speeds to 60,000 rpm and temperatures up to 170‚Â°C for extended periods. An earlier custom version of the RM22 was run by an F1 team in 2007.
Salakazi Racing of Finland, Europe‚â€™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‚Â°C to 125‚Â°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.
Filed Under: Automotive, Encoders (rotary) + resolvers, Motion control • motor controls