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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.
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 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.
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.
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.
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.
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 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.
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.
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 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.
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.