Feedback Devices

Feedback devices are a class of device required for closed loop operation. They provide a signal back to the drive or motion controller to monitor an operation or process and verify that proper operation occurs. In Motion Control applications, there are two primary feedback devices: Resolvers and Encoders.

A resolver is an electromagnetic feedback device which converts angular shaft position into analog signals. These signals can be processed in various ways, such as with an RDC (resolver-to-digital converter) to produce digital position information. There are two basic types of resolvers; transmitter and receiver. A transmitter-type is designed for rotor primary excitation and stator secondary outputs.

Position is determined by the ratio of the sine output amplitude to cosine output amplitude. A receiver-type is designed for stator primary excitations and rotor secondary output. Position is determined by the phase shift between the rotor output signal and one of the primary excitation signals.

The most popular type of Feedback Device is the Encoder. An encoder is an electromechanical device for translating linear or rotary displacement into a corresponding series of digital signals or analog output voltage.


Incremental Vs. Absolute Encoders:

Incremental Encoders

A device that generates electrical signals by means of a rotating disk that passes between a light source and photodetectors.

Incremental encoders have two output signals, or channels, commonly referred to as channel A and B. The A and B outputs are nominally 90º out of phase with each other and are interpreted by a motion controller to determine position/velocity information. The lead/lag relationship between the A and B channels provides directional information.

It is important to understand that each mechanical position is not uniquely defined. When the incremental encoder is powered on, the position of an incremental encoder is not known, since the output signals are not unique to any singular position. Incremental encoders often provide a third output that pulses once per revolution of the disk. This is typically called the Index, or Z-channel, and is commonly used for homing/reference moves.

Absolute Encoders

Absolute encoders have a unique value (voltage, binary count, etc.) for each mechanical position. 

When an absolute encoder is powered on, the position is known. Absolute encoders most commonly provide digital data in a parallel or serial format to the motion controller which is used to determine position/velocity information.

Since they provide absolute position information when powered on they eliminate the need for a homing/reference move in a motion system.

Electromate supplies feedback devices for optical & miniature encoders throughout Canada in regions like Ontario, British Columbia, and Quebec.


Encoders, Inclinometers, and Tachometers We Provide:

Optical Sensors

Includes distance sensors for all operating ranges, color/contrast sensors for sorting and detecting, and the standard photoelectric sensors of differing sizes, ranges and switching variants.


Inductive Sensors

Inductive sensors are extremely precise due to their high repeatability levels. Their simple design and uncomplicated commissioning ensure minimal downtimes.


Tilt Sensors

Electromate proudly carries TILTIX Inclinometers made by Posital. Also called tilt sensors, they're designed to measure the angle of an object with respect to the force of gravity. These tilt or level meters determine pitch and/or roll angle and output these values via the appropriate electrical interface. Inclinometers are easy to integrate to an application, because there's no need for mechanical linkages aside from the installation itself. 


Ultrasonic Sensors

A useful alternative where optical sensors come up against their physical limits. This applies, for example, for objects with uneven surfaces or under difficult ambient conditions, or with highly transparent media as well as moving, highly reflective liquid surfaces.


Vision Sensors

A high-performance smart camera fitted in a compact and light-weight housing forms. The hardware is optimally enhanced by the VISOR® software, which enables the set-up of applications in a few simple steps and the adjustment of process parameters. Thanks to the software, the process can also be continuously monitored.


Draw Wire Encoders

They measure linear motion by displacing a stainless-steel wire wound around a wire drum. The drum actuates the rotary encoder coupled to it via a coupling. The wire in the housing is retracted by a spring. A proportional output is provided by the encoder. Measurements are accurate and reliable.


Linear Encoders

Linear encoders sense and digitize linear position change for position measurement and feedback to control systems.  Linear encoders are available in two types, absolute and incremental, as defined by their position signals.  


Rotary Encoders

Electromechanical devices that convert angular position or motion of a shaft to analog or digital output signals. Rotary encoders typically fall under one of three major mounting styles: hollow-shaft, hub-shaft, and shafted.

High Vacuum Encoders

Incremental encoders with small vacuum-rated sensors for motion control applications operated in a vacuum. Specified in a wide range of applications due to their combination of performance, small size, and high vacuum rating. 


Linear Displacement Transducers

Linear displacement transducers are linear sensors that work on the magnetostrictive principle, whereby a torsional strain pulse is induced in a specially designed magnetostrictive waveguide by the momentary interaction of two magnetic fields. The interaction between these two magnetic fields produces a strain pulse which travels at sonic speed along the sensor waveguide until the pulse is detected at the head of the transducer where the electronics are embedded.


DC Tachometers

Provide a convenient means of converting rotational speed into an isolated analog voltage signal suitable for remote monitoring and velocity control applications. Tachometers are particularly suited in precision integrator and velocity servo applications, both of which require a highly linear speed/voltage relationship with minimum ripple.


Feedback Device Suppliers:

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  1. DS-37 Netzer Precision DS Series Encoders
    DS-37

    17 bit Absolute Electric Encoder, 37 mm Diameter; Analog Sin/Cos, Digital SSI or BiSS-C Output

  2. DS-58 Netzer Precision DS Series Encoders
    DS-58

    18 bit Absolute Electric Encoder, 58 mm Diameter; Digital SSI or BiSS-C Output

  3. DS-90 Netzer Precision DS Series Encoders
    DS-90

    19 bit Absolute Electric Encoder, 90 mm Diameter; Digital SSI or BiSS-C Output

  4. E Series - Analog Output Linear Displacement Transducers MTS Sensors
    E Series - Analog Output

    E Series - Analog Output

  5. E Series - CANopen Output Linear Displacement Transducers MTS Sensors
    E Series - CANopen Output

    E Series - CANopen Output

  6. E Series - SSI Output Linear Displacement Transducers MTS Sensors
    E Series - SSI Output

    E Series - SSI Output

  7. E Series - Start/Stop Output Linear Displacement Transducers MTS Sensors
    E Series - Start/Stop Output

    E Series - Start/Stop Output

  8. EP2 Series - Analog Output Linear Displacement Transducers MTS Sensors
    EP2 Series - Analog Output

    EP2 Series - Analog

  9. EP2 Series - CANopen Output Linear Displacement Transducers MTS Sensors
    EP2 Series - CANopen Output

    EP2 Series - CANopen Output

  10. EP2 Series - SSI Output Linear Displacement Transducers MTS Sensors
    EP2 Series - SSI Output

    EP2 Series - SSI Output

  11. EP2 Series - Start/Stop Output Linear Displacement Transducers MTS Sensors
    EP2 Series - Start/Stop Output

    EP2 Series - Start/Stop Output

  12. ER Series - Analog Output Linear Displacement Transducers MTS Sensors
    ER Series - Analog Output

    ER Series - Analog Output

  13. ER Series - CANopen Output Linear Displacement Transducers MTS Sensors
    ER Series - CANopen Output

    ER Series - CANopen Output

  14. ER Series - SSI Output Linear Displacement Transducers MTS Sensors
    ER Series - SSI Output

    ER Series - SSI Output

  15. ER Series - Start/Stop Output Linear Displacement Transducers MTS Sensors
    ER Series - Start/Stop Output

    ER Series - Start/Stop Output

  16. FE 10-RL Through-beam laser sensor
    FE 10-RL Through-beam laser sensor

    NPN Switching Output with M8 plug/3-wire/200mm Pigtail

  17. FE 10-RL Through-beam laser sensor
    FE 10-RL Through-beam laser sensor

    PNP Switching Output with M8 plug/3-wire/200mm Pigtail

  18. FE 10-RL Through-beam laser sensor
    FE 10-RL Through-beam laser sensor

    NPN Switching Output with M8 plug/4-wire/200mm Pigtail

  19. FE 10-RL Through-beam laser sensor
    FE 10-RL Through-beam laser sensor

    PNP Switching Output with M8 plug/4-wire/200mm Pigtail

  20. FE 10-RL Through-beam laser sensor
    FE 10-RL Through-beam laser sensor

    PNP Switching Output with 4-wire/2m Cable

  21. FE 10-RL Through-beam laser sensor
    FE 10-RL Through-beam laser sensor

    NPN Switching Output with M8 plug/4-pin

  22. FE 10-RL Through-beam laser sensor
    FE 10-RL Through-beam laser sensor

    PNP Switching Output with M8 plug/4-pin

  23. FE 10-RL Through-beam laser sensor
    FE 10-RL Through-beam laser sensor

    NPN Switching Output with 4-wire/2m Cable

  24. FG Optical windows
    FG Optical windows

    Switching Output with

  25. FG Optical windows
    FG Optical windows

    Switching Output with

  26. FG Optical windows
    FG Optical windows

    Switching Output with

  27. FGL Metall Fork sensors with metal housings
    FGL Metall Fork sensors with metal housings

    PNP Switching Output with Metal M8 plug/3-pin

  28. FGL Metall Fork sensors with metal housings
    FGL Metall Fork sensors with metal housings

    PNP Switching Output with Metal M8 plug/3-pin

  29. FGL Metall Fork sensors with metal housings
    FGL Metall Fork sensors with metal housings

    PNP Switching Output with Metal M8 plug/3-pin

  30. FGL Metall Fork sensors with metal housings
    FGL Metall Fork sensors with metal housings

    PNP Switching Output with Metal M8 plug/3-pin

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