Prologue Technology represents POSIC's inductive position sensor. The POSIC inductive position sensor combines the advantages of the inductive sensing principle and silicon integration. Using coil-on-chip technology, the bulky coil windings of the related resolvers and LVDTs are reduced to the size of a silicon chip. In the same package, an application specific integrated circuit (ASIC) provides signal conditioning with digital or analog outputs. A separate signal processing board provides interpolation and a robust interface, suitable for motion control and industrial control applications. Applications include upgrades to Hall effect based systems, motor control (brushless, miniature DC, servo), machines (textile, wood, etc.), instrumented mechanical parts (bearings, hydraulics, gear boxes), instrumentation (metering, strain, torque), dimensional measurement (calipers, gauges and robotics), where position and direction information is required.

New for 2009

New for 2009 is the new series of Incremental sensors. Of special interest is the triple channel encoder specifically designed for incremental position and a reference position sensing is required. This is achieved in an 11 x 11 mm package that is only 0.9 mm thick. The IT 3401 will be of interest for those manufacturing X-Y tables. The POSIC implementation is smaller and resistant to liquids, dust and magnetic fields from motors or any stray magnetic interference.

Below is the over view of the product series.

Sensing principle

POSIC encoders employ a differential inductive sensing principle to measure the position of ferromagnetic and/or electrically conducting objects, such as gears, discs, strips etc. The sensing principle is insensitive to magnetic fields, has a high immunity against electromagnetic perturbations and is robust against dust, particles, grease, oil etc.

Applications

Mechatronics and motion control: brushed and brushless motors, voice coil actuators, linear actuators.

Automotive: X-by-wire, electric steering, electric braking, valve control, hybrid drive.

Industrial: robotics, assembly equipment, vehicle control, hydraulic/pneumatic systems, valve position.

Medical and life sciences: pumps, dosing systems, lab automation equipment.

Single Channel Encoder

A Single Channel sensor provides one analog or digital output signal and can be used for a wide variety of targets of different materials, dimensions and shapes. Virtually any metallic object (steel, aluminum, copper, brass ...) with a structure on its surface (teeth, grooves, holes, slits, ribs) can be detected. Transitions between materials (e.g. metal - air or steel - copper) can be measured as well.

Single channel sensors are mainly used for tooth-counting applications with targets like gears, index-wheels (with only 1 tooth), PCB-disks, slotted steel disks.

A single channel sensor outputs either a differential analog signal (IS2201) or a digital signal providing one pulse per tooth/period (IS1101).

Dual Channel Encoder

A Dual Channel encoder provides two digital output signals in quadrature and scans a linear or rotational target. The linear or rotational target consists of a standard PCB with a pattern of copper stripes with a pitch of 1.2 mm.

The interpolation factor per period of 1.2 mm is adjustable from x1 (2 bits) to x 1024 (10 bits), corresponding to a linear resolution of 0.3 mm to 0.3 um.

The bandwidth is adjustable from 10 Hz to 40 kHz (period frequency), corresponding to a linear speed range from 10 mm/s to 50 m/s.

Triple Channel Encoder

The Triple Channel encoders are used for applications where incremental position information and a reference position (Index) are required.

The target is very similar to the targets for the Dual Channel encoder, but contains two tracks: one for the A and B signals and one for the Index. The Index signal is synchronized to the A and B signals and thus provides a very accurate and repeatable reference.

More Details:
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