A more compact sensor
Original article date: November 1999
ROBERT WORRALL of Encoder Technology explains tells us why the Inductcoder sensor enjoys hostile environments
Based on the principle of magnetic induction, Inductcoder from Encoder Technology is a totally original sensor which offers significant benefits. Excellent repeatability, high resolution, high accuracy and quick response are the principal characteristics of this non-contact sensor, which could prove a particularly popular choice for applications in hostile environments. it is also exceptionally compact, light and attractively priced – indeed, it is now on special offer!
The development has resulted from sponsorship and support from the Government and from major names in the engineering industry. Now available in the UK, Inductcoder offers a serious challenge to existing position sensor technology and has already been adopted by some of the world’s leading machinery and systems manufacturers.
Typically, an absolute resolution of 220 (ie 20 bit) can be achieved with an ultra-small rotary Inductcoder sensor of only 10mm diameter! Such a device is not only extremely rugged, but is also highly effective.
Inductcoder is a digital absolute system which comprises a detecting element – a combination of magnetic coil and ferromagnetic material – and a conversion element. This converts mechanical deviation to the phase difference between the input and output signals and establishes position by measuring time.
This position data output is refreshed at every scan
(10-4s) and is interpolated further up to 10-4s x 1/128 to provide an even faster response.
Thanks to the phase difference detecting system, the relationship between amplitude and cable length does not need to be considered. Accordingly, Inductcoder has good repeatability. Minimal temperature drift is assured as compensation for any fluctuation is automatic and as the sensor uses an AC magnetic circuit, there is no hysteresis.
This unique device may be specified to suit a wide range of applications, including the control of hydraulic and pneumatic systems. Automated semiconductor production is also a prime market for the new sensor. As its detecting element consists only of magnetic coils, Inductcoder is highly resistant to vibration, shock, oil, dust and extremes of temperature.
Options include rotary, linear, wire, stroke detection, linear gauge and strain gauge types. There is an analogue output (0 to 10V, 4 to 20mA) and digital output, including parallel and series – RS232C, RS422 and Canbus. An incremental and absolute encoder high resolution signal is also available. Intelligent outputs for velocity, acceleration, multi-switch and diagnostic signal may also be specified.
- Encoder Technology
November 1999