Capacitive rotary encoder without built-in bearing and its installation method

Abstract

The invention relates to a capacitance type rotary encoder without a built-in bearing. The capacitance type rotary encoder comprises a rotor mechanism, a stator mechanism, and installation accessories. The rotor mechanism comprises a spindle, a fixed ring and a rotary table. The stator mechanism comprises a shell, an upper circuit board and a lower circuit board. The bottom of the shell is provided with a plurality of convex points. The shell is provided with a containing cavity for receiving the rotary table. The upper circuit board and the upper surface of the rotary table have a first gap, the lower circuit board and the lower surface of the rotary table have a second gap, and the height of the second gap is equal to the heights of the convex points. At the same time, the invention provides an installation method of the capacitance type rotary encoder without a built-in bearing. The capacitance type rotary encoder and the installation method have the advantages that the capacitance type structure without a built-in bearing is used, the installation space is saved, the sizes of the installation accessories can be set according to the size of an installation terminal, the structural requirement for the installation terminal is reduced, and the installation universality is improved. The precision of an axial gap is realized through convex point assistance in installation, the radial concentricity is realized through the installation accessories, and the installation is very simple and convenient.

Description

technical field [0001] The invention relates to the field of rotary encoder design, in particular to a capacitive rotary encoder without a built-in bearing and an installation method thereof. Background technique [0002] At present, rotary encoders can be divided into photoelectric, magnetoelectric and capacitive in principle, and can be divided into two structures with built-in bearings and without built-in bearings from the mechanical mechanism. Compared with rotary encoders with built-in bearings, the advantages of rotary encoders without built-in bearings are: saving space, allowing high-speed shafts, no additional starting torque, and service life not limited by bearing life, etc. However, the rotary encoder without built-in bearing also has disadvantages: it is disturbed by the movement of the motor shaft and difficult to install. The capacitive encoder adopts the principle of full-circle scanning detection, which allows high axial and radial errors, which can just m...

AI Technical Summary

Problems solved by technology

However, there is no direct fixed connection between the rotor mechanism and the stator mechanism of the capacitive rotary encoder without built-in bearing, and there is free floating space for the rotor mechanism on the stator mechanism, resulting in the widespread installation difficult question

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