Single-bearing photoelectric encoder

Abstract

The invention relates to a single-bearing photoelectric encoder. The encoder comprises a circuit board, a main shaft, a grating, a base and a bearing. A bearing chamber is formed in the lower surfaceof the base. The bearing is fixedly connected to the bearing chamber. The bearing comprises an outer ring bonded to the inner wall of the bearing chamber and an inner ring rotationally connected to the outer ring. The main shaft is bonded to the inner portion of the inner ring. A support assembly for preventing the main shaft from drifting in the axial direction is arranged below the bearing. During operation, a motor shaft is inserted to penetrate through the main shaft, and is fixed through a locking device. The body of the encoder is made of a high-temperature plastic material, and a bearing is omitted, axial drifting of the motor under measurement in a case of single-bearing is effectively avoided through an arrangement of a supporting assembly; and compared with a traditional encoder,the single-bearing photoelectric encoder is smaller in size and the height is reduced by about 10 mm, is more suitable for miniaturization of servo devices, and the product cost is reduced by about 10-15%.

Description

technical field [0001] The invention relates to the technical field of electronic measurement, in particular to a single-bearing photoelectric encoder. Background technique [0002] Photoelectric encoder is a sensor that converts the mechanical geometric displacement of the output shaft into pulse or digital quantity through photoelectric conversion. It is mainly used in various numerical control equipment and is the most widely used sensor at present. Photoelectric encoder is mainly composed of grating It is composed of a photoelectric detection device. In the servo system, the grating and the motor are coaxial so that the rotation of the motor drives the rotation of the grating, and then a number of pulse signals are output by the photoelectric detection device. According to the number of pulses per second of the signal, the current motor can be calculated. Rotating speed. One of the core problems of the incremental photoelectric encoder is to accurately ensure the air ga...

AI Technical Summary

Problems solved by technology

One of the core problems of the incremental photoelectric encoder is to accurately ensure the air gap between the grating and the photoelectric conversion chip on the circuit board. The integrated photoelectric encoder is currently the mainstream product in the servo market. For the integrated encoder In other words, because the upper and lower bearings are used to compensate for the axial movement of the motor during the measurement process, the size of the shaft system is easy to be fixed, but it has defects such as large volume and high cost.

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