Absolute magnetic-electric rotary encoder with low cost, high accuracy and multiple circles

Abstract

The invention provides an absolute magnetic-electric rotary encoder with low cost, high accuracy and multiple circles, belonging to one of a shaft angle sensor and a displacement sensor. A main shaft supports against a main fixed bottom plate through a bearing, the front end of a pinion shaft is fixed on the main shaft through a screw, and the pinion shaft drives a circle recording component to complete a circle counting function; a bump part at the tail end of the pinion shaft is tightly assembled and fixed with an Nd-Fe-B magnet and angle position information in a single circle is obtained through a magnetic-electric induction chip fixed on a comprehensive circuit board; the comprehensive circuit board comprehensively processes the obtained number of circles and the angle position information of the single circle simultaneously to form continuous position information; the circle recording component and the comprehensive circuit board are fixed on the main fixed bottom plate through the screw and a gasket; all the elements are installed in a shell, and the whole encoder adopts an elastic installation way. With the novel magnetic-electric device with high integrity and the self-designed comprehensive circuit board, the invention simplifies installation structure, thereby being very compact and effectively reducing product axial size; and the invention adopts the magnetic-electric way, thereby greatly reducing the cost in the premise of ensuring measurement accuracy in comparison with the photoelectric way and being capable of adapting to the severe operation environment, therefore, the invention can be widely applied to the industry field, the automobile field, even the consumption field where accurate multiple-circle position measurement is required.

Description

technical field [0001] The invention relates to a low-cost high-precision multi-turn absolute magnetoelectric rotary encoder, specifically a multi-turn position detection element or feedback element for industrial equipment, automotive equipment or consumer equipment, belonging to a shaft angle and displacement sensor. Background technique [0002] Before the present invention, photoelectric technology was widely used in non-contact multi-turn rotary encoders. The application of photoelectric rotary encoders has a history of several decades, and there are various types and sizes of products on the market. [0003] Although the photoelectric rotary encoder is also non-contact, it still has some obvious disadvantages. On the one hand, through-beam photoelectric rotary encoders are not only triggered by shading lines and spacers on the grating disc, but also by dust and dirt particles, which is especially evident on high-precision code discs with small shading and spacers . ...

AI Technical Summary

Problems solved by technology

Even so, humidity inside the sensor can rise due to temperature changes, potentially blocking the grating disk and rendering the encoder unusable in high humidity conditions

On the other hand, LED light-emitting tubes have a limited service life, and in some applications with high safety requirements, the preventive replacement cycle is usually 6 to 12 months

[0004] Moreover, the photoelectric rotary encoder uses a grating disk and a photoelectric component reading mechanism, so it has high processing requirements for installing the spindle and fixing the bottom plate. If the verticality and concentricity are not good, the reading mechanism will not be able to read accurate position data.

[0005] At the same time, due to the high complexity of the grating disk and the reading mechanism, its processing cost and use cost are also high. Therefore, considering the cost factor, the photoelectric absolute encoder cannot be widely used, and for some companies that need to use an absolute encoder Occasionally, due to cost reasons, incremental rotary encoders are used one after another, and the origin is memorized by its built-in battery, which is combined into a pseudo-absolute encoder. However, if the battery line is not connected, its essence is still an incremental rotary encoder. device, and the need for an external battery also brings a lot of trouble in practical applications. At present, this method is more common in some Japanese servo systems.

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