Encoders & Feedback

About encoders & feedback

Encoders and feedback devices translate mechanical motion into electrical signals for control and measurement. This category encompasses incremental, absolute, rotary, and linear encoders, alongside resolvers. Incremental encoders output a series of pulses per unit of displacement, often in quadrature (A/B channels) with an index pulse (Z channel), providing relative position. Absolute encoders provide a unique digital code for each position, maintaining position information after power cycling, available in single-turn and multi-turn variants. Rotary encoders measure angular displacement, specified by resolution (PPR for incremental, bits for absolute), shaft diameter (e.g., 6mm, 10mm, 1/4", 3/8"), mounting style (flange, servo, hollow shaft), and output protocol (e.g., HTL, TTL, SSI, BiSS, Ethernet/IP, PROFINET). Linear encoders measure linear displacement, defined by resolution, measuring length, and output. Resolvers are analog inductive devices providing absolute angular position via sine/cosine signals, robust in harsh environments. Key selection parameters include resolution, accuracy, operating temperature range, shock/vibration resistance, IP rating (e.g., IP65, IP67), electrical interface, and supply voltage. Common materials include aluminum or stainless steel housings, with various bearing types for rotary units.