Position measuring devices that rely on the principle of mutual induction include resolvers, linear variable differential transformers (LVDTs), and inductive encoders. Two of these technologies — resolvers and LVDTs — are based on the construction and operation of a transformer. In the case of an LVDT, voltage is applied to a primary winding and induced in […]
Encoders
Magnetic ring encoder features functional safety for machine tool applications
HEIDENHAIN’s new absolute modular magnetic angle encoder is for applications needing contamination-resistant encoders with functional safety (FS) for machine feedback. This new ECM 2400 encoder supplements HEIDENHAIN’s portfolio of absolute angle encoders and is designed for machine tool applications that require a sturdy encoder with medium accuracy. The ECM 2400 is suitable for applications with […]
Absolute encoder interfaces: Differences between SSI, BiSS, Hiperface, and EnDat
Absolute encoders can communicate with controllers through parallel or serial wiring, over a fieldbus, or via an Ethernet-based protocol such as EtherCAT. Of these options, serial communication is a simpler solution than parallel wiring (which requires a twisted pair of wires for each bit of output) and is well-suited for applications that aren’t complex enough […]
New spring-loaded pivot arm for wheel-encoder assemblies
POSITAL has introduced a new spring-loaded pivot arm mounting system for wheel-encoder assemblies. Like earlier spring-loaded mounting brackets, this device is designed to minimize slippage by maintaining a steady contact pressure between the wheel and the moving surface. However, the pivot arm can accommodate larger lateral movements of the moving surface. Spring tension can be […]
Programmability is a key encoder design trend
Encoders are central to motion control applications, providing feedback in order to increase system accuracy and reliability. As other components in motion systems evolve, encoder manufacturers are making sure that their offerings keep pace with these broader technological changes. For instance, the rise in high-performance networks for motion control is in part driven by the […]
What is a tachogenerator and when is it used?
There are several ways to measure the position of a rotary axis, and some position measuring devices, such as incremental and absolute encoders, can also derive the speed of the axis by evaluating a combination of distance, time, and pulses. But for applications that require only speed measurement — without position information — a tachogenerator may […]
Safety encoder features ultra-compact dimensions
With the TRK38, TWK introduces an ultra-compact single-turn magnetic encoder developed with safety-oriented applications in mind. With a diameter of only 38 mm and a length of also 38 mm, and a weight of 60 g, the sensor is suitable for mounting in confined installation spaces. The TRK38 detects position and speed in a safety-oriented […]
Multiturn absolute encoders with line driver feature integrated referencing
In combination with brushless dc servomotors, the new magnetic AEMT-12/16 L absolute encoder from FAULHABER delivers absolute angle information with a preset multi-turn resolution of 16 bits (65,536 revolutions) and a single-turn resolution of 12 bits (4,096 steps) for commutation, speed control and motion control. This position data can be queried by an SSI Interface […]
Smarter, faster angle encoders improve direct-drive motor performance
HEIDENHAIN has introduced smarter and faster versions of the RCN absolute angle encoders series for use in machine tools requiring high speed, accuracy and contamination resistance. The new models RCN 2001, 5001 and 8001 are especially useful with fast rotating axes and direct-drive motors because the permissible speeds are up to three times higher than […]
Multi-turn encoders for miniature motors require no battery backup
POSITAL’s new 22-mm multiturn kit encoders are high-precision multiturn absolute position feedback devices for miniature motors and drives. While motion feedback devices for small motors have previously been limited to single-turn or incremental encoders, the new compact kit encoders from POSITAL now provide full multiturn measurement capabilities – without any need for backup batteries. The […]