Positek's Rotary Transducers

Positek's Rotary Transducers are cost-effective alternatives to traditional rotary potentiometers. Non-contact transducers using Positek's novel PIPS® (Positek Inductive Position Sensor) technology are most suitable for demanding control and feedback applications. For many applications, traditional rotary potentiometers can give reliability and signal integrity problems after a period of time. The life of traditional rotary potentiometers is limited by wear on the track and contacts, particularly when high levels of vibrations exist. Also, a traditional rotary potentiometer can give a noisy output signal due to micro lifting of the wiper contacts.

In a Positek inductive Rotary transducer the inductive coil is completely protected from the moving parts and therefore is not subject to any wear. The coil in a Positek inductive Rotary transducer is constructed using printed circuit board techniques. The life and the ability to withstand high vibration levels is therefore considerably extended.

Positek's patented ASIC provides the Positek's inductive Rotary transducer with the ability to consistently produce a stable output signal. The basic circuit operates from a 5 volt supply and produces a 0 to 5 volt output which is ratiometric to the supply voltage. The current drain is typically 10mA. The supply voltage and output are common in automotive applications but in the fluid power industry a wide range of input/output options need to be available.

A particular feature of Positek's inductive Rotary transducer is the wide variety of standard interface options available. Using a small amount of additional circuitry within the inductive Rotary transducer cater for these options.

Interface options available are:

Gain and offset of a Positek inductive Rotary transducer is set during calibration but these can be trimmed in the field if adjustable type is specified.

The range of Positek's inductive sensors available can cater for rotary movement of up to 160 degrees. The linearity of Positek's inductive Rotary transducer is better than 0.1º over 90º rotation although the sensor has a maximum range of 160º rotation.

Positek's non-contact inductive Rotary transducer offer excellent performance and durability from a low cost device making them a better alternative to traditional ones.

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