Incremental Encoders - POSIC - #1

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Overview Incremental Encoders OIE-V1A Page 1 of 2 www.posic.com 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 toothcounting applications with targets like gears, indexwheels (with only 1 tooth), PCB-disks, slotted steel disks. Out+ Out- 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. A B 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. A B I 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.