Absolute encoders allow control of a wide range of motor motors.

Absolute EncoderIt is used to detect (check and test) the position and speed of rotary motion systems.Absolute EncoderClosed-loop control can be implemented for a variety of motor control applications, such as switched reluctance motors and AC induction motors.

A typical absolute encoder consists of a slotted wheel placed on a motor drive shaft and a transmitter/detector module for detecting (checking and testing) the slots on that wheel. Absolute encoders are widely used in water conservancy, light industry, machinery, metallurgy, textile, petroleum, aviation, marine and other industries. Specific to the project category such as: rotary table, gate opening, valve opening, hoist crane positioning, traveling crane positioning, level measurement, missile launch angle positioning, missile air rudder measurement, electronic latitude and longitude and other high-precision measurement and positioning occasions. Typically, there are three outputs, namely: A-phase, B-phase and index, and the information provided can be received to provide information about the motion of the motor shaft, including distance and direction.

The relationship between the two channels, phase A and phase B, is unique. Absolute encoder code value" and the measured "position" corresponds to the only, with "power failure memory" function, no rotary measurement accumulation error, in "a cycle "It is superior to incremental encoder in the field of measurement and control, and the range can be adjusted by adding a front reduction gearbox. If phase A is ahead of phase B, then the direction of rotation of the motor is considered to be positive. If phase A lags behind phase B, then the motor's direction of rotation is considered reversed. The third channel, called the index pulse, generates one pulse per revolution and is used as a reference to determine absolute position. The quadrature signal generated by the encoder can have four distinct states. Note that the order of these states is reversed when the direction of rotation is changed. The encoder captures the phase signals and index pulses and converts the information into a digital count of position pulses. Typically, this count value is incremented as the drive shaft rotates in one direction and decremented as the drive shaft rotates in the other direction. By selecting the ;x4 ;measurement mode, the QEI logic causes the position counter to count on both the rising and falling edges of the A-phase and B-phase input signals, which can provide more accurate data for determining the encoder position.

The Absolute Encoder Interface Module provides an interface to incremental encoders. An incremental encoder encoder is a device that converts an angular or linear displacement into an electrical signal. The former is called a code disk and the latter is called a code scale. According to the readout method encoder can be divided into contact and non-contact two kinds. Contact with the brush output, a brush contact conductive area or insulated area to indicate the state of the code is "1" or "0"; non-contact acceptance of the sensitive element is a photosensitive element or a magnetic element, the use of light-sensitive components to light-transmitting and light-impermeable areas to indicate the state of the code is "1" or "0"; non-contact acceptance of sensitive elements are light-sensitive elements or magnetic elements, light-sensitive elements to transmittance and opaque areas to indicate The QEI consists of decoding logic for decoding phase A and phase B signals, and an increment/decrement counter for totalizing the count value.