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Piher's new fully featured rotary sensor offers a small package and cost effective alternative to encoder technology
Piher has announced the immediate availability of a new shaft angle rotary sensor – the PST-360 Through-Hole Position Sensor. The PST-360 combines a through-shaft design with 360° absolute position feedback in an extremely thin package.
Key features include through hole sensing where the shaft passes directly through the sensor, high accuracy absolute position feedback over 360°, and a true non-contacting sensing element. The new sensor incorporates a proprietary ring magnet with Hall chip for the sensor element. This combination does not rely on gears or other rotating parts, maximizing robustness and sensing accuracy. The proprietary design provides a streamlined sensor with only one moving part along with electronics designed for harsh environments. The result is a cost-effective product in an extremely small package.
Measuring just 9.8mm thick with a body diameter of 37mm and 50.0mm mounting hole spacing, engineers can now integrate a fully featured rotary sensor directly on their existing shafts without the packaging issues that typically accompany encoders or other through shaft sensing devices. The exceptionally low profile fits easily in places that were previously too narrow for pre-packaged rotary sensors. The standard model features a 14.05mm diameter double flatted shaft design. Custom rotor configurations are available from Piher to adapt existing OEM shafts to the standard PST-360 Sensor.
The PST-360 utilities a patented Hall effect technology to enable true non-contacting through-hole shaft sensing with only one moving part –the proprietary ring magnet. This design is extremely robust with fully encapsulated electronics surrounding the durable ring magnet. Unlike optical encoders it has no sensitivity to dust or dirt and can tolerant high vibration cycles as the ring magnet never comes into contact with the sensing electronics. The device is a true absolute sensor providing high accuracy position feedback at power on.
The new device offers electrical angles up to 360° with no dead band and linearity error as low as ±0.5%. Rated for use at -40ºC to +85ºC (others upon request), the sensor can be programmed with full scale output with angles as narrow as 20 degrees. The device supports most common electrical signal outputs with minimal investment. Optional outputs include: Analog, PWM up to 12 bits or Serial Protocol (SPI) up to 14 bits and includes a second output channel to provide a programmable switch signal. A fully redundant version with a dual core sensor is also available, yielding a true quad redundant sensor in the same packaging.
With its integrated redundancy, the new sensor is ideally suited for use in a wide range of off-highway, construction and agriculture equipment steer-by-wire applications. It can be easily adapted to fit marine outboard steering and throttle control, sport and exercise equipment, wind indicators, automation equipment and medical devices. A wide range of popular mating connectors is available as optional features.
“The PST-360 provides a breakthrough in terms of simplicity, size, cost and robustness especially when compared to existing absolute angle sensors and encoders,” explains Paul Cain, Piher International’s General Manager for North America. “The propriety Hall design incorporates a rotating ring magnet as the sensing source, allowing for the smaller package and simplified electronics.”
For more information, or details on the full range of Piher products available from Anglia, please email info@anglia.com
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This news article was originally published in November 2011.
