Permanent magnet ball joint with posture sensing function and measuring method of permanent magnet ball joint

Abstract

The invention discloses a permanent magnet ball joint with a posture sensing function and a measuring method of the permanent magnet ball joint. The permanent magnet ball joint comprises a first permanent magnet, a second permanent magnet, a rotary shaft, a spherical shell, an upper base, a lower base and a Hall sensor. The first permanent magnet is sealed in the spherical shell. The second permanent magnet is fixedly arranged on the lower base. The Hall sensor is arranged on the second permanent magnet. A groove is formed in the lower base, and an opening of the groove faces upwards. One end of the spherical shell is embedded in the groove of the lower base. The other end of the spherical shell stretches out of the upper base to be fixedly connected with the rotary shaft. The rotary shaft drives the spherical shell to rotate relative to the upper base, the second permanent magnet and the lower base. By the adoption of the permanent magnet ball joint with the posture sensing function and the measuring method of the permanent magnet ball joint, multi-degree-of-freedom rotation of the rotary shaft is achieved, the polarization directions of the upper permanent magnet and the lower permanent magnet are opposite, part of gravity of the rotary shaft is counteracted by repulsive force, the positive pressure to a contact portion between the rotary shaft and a bearing is reduced, then the friction is reduced, the abrasion is reduced, the service life of the bearing is prolonged, and vibration and noise are reduced; a good lubricating function is achieved through magnetorheological fluid, and friction is reduced; the position of the rotary shaft can be obtained conveniently and rapidly through detection of the Hall sensor and the mapping relation.

Description

technical field [0001] The invention relates to the field of magnetic field sensing, in particular to a permanent magnet ball joint with built-in attitude sensing and a measuring method thereof. Background technique [0002] Traditional mechanical bearings are generally composed of inner rings, outer rings, rolling elements, and cages. There is friction between the bearings and the shaft, resulting in useless power consumption, which not only reduces transmission efficiency but also generates noise. In addition, due to the large relative movement space in the rolling bearings in the traditional bearings, the bearings have poor ability to withstand impact loads, low service life under high-speed and heavy-load conditions, and there are large mechanical vibrations and noises. [0003] In some occasions where rotation with multiple degrees of freedom is required, designers often use multi-degree-of-freedom bearings. Traditional multi-degree-of-freedom bearings include spherica...

AI Technical Summary

Problems solved by technology

Traditional multi-degree-of-freedom bearings include spherical rolling bearings, universal joints, Hooke hinges, etc. Although these multi-degree-of-freedom bearings can achieve multi-degree-of-freedom rotation, they have some shortcomings: the manufacturing of spherical rolling bearings requires high precision, and long-term motion wear The accuracy of the movement cannot be guaranteed; the structure of the universal joint and Hooke hinge is complex, and the movement is not flexible enough

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