Absolute multi-turn photoelectric encoder

Abstract

The invention discloses an absolute multi-turn photoelectric encoder. The photoelectric encoder comprises a mounting sleeve, a front end cover, a rear end cover, a middle support plate, an input toothshaft, a multi-stage gear set, a photoelectric code disc, a photoelectric module, a conditioning circuit board, and a code disc shaft. The front end cover and the rear end cover are fixedly connectedto the front end and the rear end of the mounting sleeve respectively. The middle support plate is fixed in the mounting sleeve. The inner end of the input tooth shaft extends into the mounting sleeve. The multi-stage gear set is arranged in the mounting sleeve and is between the front end cover and the middle support plate. The photoelectric code disc, the photoelectric module, and the conditioning circuit board are arranged in the mounting sleeve and are located between the rear end cover and the middle support plate. The code disc shaft passes through the middle support plate, is fixedly connected with the multi-stage gear set by the front end, and is fixedly connected with the photoelectric code disc by the rear end. The photoelectric module is connected with the conditioning circuitboard. According to the absolute multi-turn photoelectric encoder, a binary cyclic redundancy code reflecting the position of the photoelectric code disc is generated by means of a photoelectric coupling between the photoelectric module and the code disc and a predetermined reduction ratio is achieved through the multi-stage gear set, so as to guarantee that the binary encoded value output withinthe effective number of uses is not repeated; and a standard RS485 bus interface output is provided through a signal conditioning circuit.

Description

technical field [0001] The invention relates to the field of photoelectric encoders, in particular to an absolute multi-turn photoelectric encoder. Background technique [0002] Photoelectric encoders are currently widely used in the field of motion control. They are mainly used to detect the rotational angular displacement of rotating equipment such as motors and related physical quantity detection. By directly detecting angular displacement, linear displacement, rotational speed and linear velocity can be indirectly detected. Photoelectric encoder can be divided into incremental type and absolute value type according to the functional principle. When the shaft rotates at a certain angle, the incremental encoder provides a certain number of square wave pulses or sine and cosine pulses according to a certain ratio. Quantitative encoders are mainly used to detect the speed of a rotating shaft. For absolute encoders, within the measuring range, each axis position of the rotar...

AI Technical Summary

Problems solved by technology

Unlike incremental photoelectric encoders, absolute multi-turn photoelectric encoders are difficult to design and manufacture and relatively expensive

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