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AMO encoders convert displacement into periodic electrical signals, which are then converted into counting pulses, with the number of pulses representing the magnitude of displacement. According to their operating principle, encoders can be divided into incremental and absolute types. Incremental encoders convert displacement into periodic electrical signals, which are then converted into counting pulses, with the number of pulses representing the magnitude of displacement. An encoder is a device that converts angular or linear displacement into electrical signals. The former is called a code disk, and the latter a code scale. According to the readout method, encoders can be divided into contact and non-contact types. Contact types use brush outputs, where a brush contacting a conductive or insulating area indicates whether the code status is "1" or "0"; non-contact types use photosensitive or magnetosensitive elements as receiving sensors. When using photosensitive elements, transparent and opaque areas indicate whether the code status is "1" or "0".

AMO encoder classification

According to their operating principle, encoders can be divided into incremental and absolute types. Incremental encoders convert displacement into periodic electrical signals, which are then converted into counting pulses, with the number of pulses representing the magnitude of displacement. Each position of an absolute encoder corresponds to a specific digital code, so its reading depends only on the start and end positions of the measurement, not on the intermediate process. Rotary incremental encoders output pulses during rotation, and their position is determined by counting equipment. When the encoder is stationary or power is lost, the position is retained in the internal memory of the counting device. Therefore, after a power loss, the encoder must not move, and no pulses must be lost due to interference during pulse output when power is restored; otherwise, the zero point remembered by the counting device will shift. The magnitude of this shift is unknown and can only be detected when erroneous production results occur. The solution is to add a reference point. Each time the encoder passes the reference point, the reference position corrects the memory position of the counting device. Before reaching the reference point, position accuracy cannot be guaranteed. For this reason, industrial control systems often include methods such as finding the reference point before each operation or homing at startup. For example, the positioning of printers and scanners uses the principle of incremental encoders. Each time they are powered on, a clicking sound is heard as they search for the reference zero point before starting work.

AMO encoder features

When the encoder shaft rotates, corresponding pulses are output. The direction of rotation and the increase or decrease in pulse count are determined by the subsequent direction-detection circuit and counter. The counting start point can be set arbitrarily, allowing for multi-turn infinite accumulation and measurement. The Z signal, which outputs one pulse per revolution, can serve as the reference mechanical zero position. The encoder shaft outputs a fixed number of pulses per revolution, determined by the number of lines on the encoder grating. To improve resolution, the original pulse count can be multiplied using two signals, A and B, with a 90-degree phase difference, or a high-resolution encoder can be used.

AMO encoder operating principle

Equally spaced slots (divided into transparent and opaque sections) are cut along the edge of a code disk. A light source and a photosensitive element are installed on opposite sides of the slotted disk. As the disk rotates with the working shaft, each slot passing causes a change in light intensity. After shaping and amplification, electrical pulse output signals with specific amplitude and power are generated. The number of pulses equals the number of slots passed. These pulse signals are sent to a counter for counting, and the angle of rotation of the disk is determined from the counted digital value. To determine the direction of rotation, two photoelectric conversion devices can be used. Their relative spatial positions are arranged to ensure that the signals they produce have a phase difference of 1/4 cycle.

Weidou Intelligent Technology specializes in selling German AMO rotary encoders, AMO incremental encoders, AMO absolute encoders, AMO optical encoders, AMO magnetic encoders, AMO shafted encoders, AMO hollow shaft encoders, AMO contact brush encoders, AMO angle encoders, AMO linear encoders, AMO digital encoders, AMO draw-wire encoders, AMO position encoders, AMO hollow bore encoders, and AMO spindle encoders. All AMO products are original imports from Germany. Customers are welcome to inquire and place orders.