CN205352419U

CN205352419U - Magnetic resistance absolute encoder

Info

Publication number: CN205352419U
Application number: CN201521023934.3U
Authority: CN
Inventors: 王忠杰; 孟宪强; 于海洋; 杨尚; 刘伯愚
Original assignee: CHANGCHUN YUHENG OPTICS Co Ltd
Current assignee: CHANGCHUN YUHENG OPTICS Co Ltd
Priority date: 2015-12-11
Filing date: 2015-12-11
Publication date: 2016-06-29
Anticipated expiration: 2025-12-11

Abstract

The utility model relates to a magnetic resistance absolute encoder belongs to encoder passive measurement technical field. The metallic disc centre of a circle and rotation axis center eccentric mounting, this metallic disc are ferromagnetic nature material, and a magneto resistive sensor places the radial orientation at rotation center, just with the metallic disc coplanar. The advantage is: novel structure, it is low to the environmental requirement, user simple to operate, the precision is reliable, is fit for installing hollow shaft or the solid shafting rear end at the heavy -calibre, and does not hinder motor shaft other terminal erection equipments, requires lowly to the motor, and photoelectric encoder can be solved to axial float and diameter runout sensitivity scheduling problem to the method, has improved the adaptability of product. Expansion nature is good, can be applied to one -loop absolute type photoelectric encoder, incremental encoder.

Description

A kind of magnetic resistance absolute type encoder

Technical field

This utility model belongs to encoder passive measurement technical field.

Background technology

Absolute type encoder has the wide market demand, therefore each producer insistent research and development absolute type encoder all the time, absolute encoder is always up taking as the leading factor with photo-electric for a long time, there is certain angular deviation in the groove of grating disc and the groove of indication grating, after grating disc rotates, irradiate through directional light, light cell produces light and dark Morie fringe, light cell perception light intensity change output cosine and sine signal；Shortcoming is that environmental requirement is higher, it is easy to be subject to the erosion of greasy dirt, and grating disc is glass material, it is easy to be subject to the impact of the environment such as exterior vibration, impact, and code-disc occurs broken, and needs to do encapsulation process.

Magneto-electric RESEARCH AND DEVELOPMENT OF SINGLE RING ABSOLUTE ENCODER also answers the market demand to be applied in every field simultaneously, its principle: fix a magnetic post in the axle center of rotating shaft, hall device is placed in the surface of magnetic post, magnetic post rotates in one week process, the magnetic flux direction that Hall element receives is continually changing, and exports cosine and sine signal by processing of circuit；This mounting means is only applicable to axle head and installs, it is impossible to realizing big hollow axle and install, and the magnetic scope of magnetic post is little, the waveform sine obtained is inadequate, limits the segmentation to waveform.

Summary of the invention

This utility model provides a kind of magnetic resistance absolute type encoder, to solve existence environmental requirement is higher, is only applicable to axle head and installs, big hollow axle cannot be realized install, and the magnetic scope of magnetic post is little, the waveform sine obtained is inadequate, the problem limiting the segmentation to waveform.

This utility model adopts the technical scheme that: the rosette center of circle and rotating shaft center are eccentrically mounted, and this rosette is ferromagnetic property material, and a magnetoresistive transducer is placed on the radial direction of center of rotation, and with rosette same plane.

Described N number of magnetoresistive transducer difference certain angle is placed, and with center of rotation apart from equal, N >=2, N is natural number.

Said two magnetoresistive transducer differs 90 degree of directions and places, and with center of rotation apart from equal.

Described rosette is made a call to an aperture at eccentric direction or adds a metal derby in eccentric opposite direction.

Described magnetoresistive transducer is connected with signal processor.

The utility model has the advantages that: novel structure, environmental requirement is low, use magnetoresistive transducer, can be used for optical-electricity encoder cannot the environment of greasy dirt of normal operation, anti-vibration, relatively photoelectric encoder failure rate is low；Magnetoresistive sensor technology used is ripe, and rosette difficulty of processing is low, also solves, while reducing cost, the problem that photoelectric encoder is high to requirement on machining accuracy.User installation is convenient, and precision is reliable, is adapted for mount on bigbore hollow axle or solid shafting rear end, and do not interfere with other installation equipment of motor shaft end, requiring low to motor, the method can solve photoelectric encoder to problems such as axial float and circular runout sensitivities, improves the adaptability of product.Expansion is good, can be applicable to RESEARCH AND DEVELOPMENT OF SINGLE RING ABSOLUTE ENCODER, incremental encoder.

Accompanying drawing explanation

Fig. 1 is structure principle chart of the present utility model；

Fig. 2 is that this utility model has material reducing aperture or at reversely reinforced structure principle chart；

Fig. 3 is the structure principle chart of the N number of magnetoresistive transducer of this utility model.

Detailed description of the invention

Rosette 1 center of circle O1 and rotating shaft 3 center O are eccentrically mounted, and this rosette is ferromagnetic property material, and a magnetoresistive transducer 2 is placed on the radial direction of center of rotation, and with rosette same plane；

Described N number of magnetoresistive transducer difference certain angle is placed, and with center of rotation apart from equal, N >=2, N is natural number,

Said two magnetoresistive transducer differs 90 degree of directions and places, and with center of rotation apart from equal,

Described rosette is made a call to a material reducing aperture 5 at eccentric direction or adds a metal derby 6 in eccentric opposite direction,

Described magnetoresistive transducer is connected with signal processor 4.

Operation principle, in the process of eccentric metal disk rotational one circle, with the gap journey sine regularity change of magnetoresistive transducer, namely output signal is sine relation with rotational angle.

Magnetoresistive transducer 1, magnetoresistive transducer 22 ' difference 90 degree, eccentric metal disk is in rotary course, and the gap between the same position of disk and two magnetoresistive transducers is identical, and this makes two paths of signals waveform identical, but the phase contrast of difference 90 degree.

Rosette plays an aperture material reducing or reversely reinforced at eccentric direction, and satisfying dynamic equilibrium requirement keeps rosette not produce centrifugal force.

The cosine and sine signal of magnetoresistive transducer output, after signal processor segments, the sine and cosine ripple in one cycle is subdivided into N part, every portion has absolute positional relation, can use as absolute type encoder, there is positioning function, the any position in 360 degree can be measured, also local angle change can be measured, as: angle displacement detects, high-accuracy turntable, the joint etc. that the little scope of industrial robot rotates, apply also for the situation of a rosette and N number of magnetoresistive transducer, i.e. magnetoresistive transducer one, magnetoresistive transducer two ... magnetoresistive transducer N is placed on center of rotation radial direction, certain angle is differed between magnetoresistive transducer, as shown in Figure 3, and with rosette in the same plane, the signal of the sine and cosine waveform of the certain phase contrast of N number of difference can be obtained, N > 2, N is natural number.

Claims

1. a magnetic resistance absolute type encoder, it is characterised in that: the rosette center of circle and rotating shaft center are eccentrically mounted, and this rosette is ferromagnetic property material, and a magnetoresistive transducer is placed on the radial direction of center of rotation, and with rosette same plane.

2. a kind of magnetic resistance absolute type encoder according to claim 1, it is characterised in that: N number of magnetoresistive transducer difference certain angle is placed, and with center of rotation apart from equal, N >=2, N is natural number.

3. a kind of magnetic resistance absolute type encoder according to claim 2, it is characterised in that: two magnetoresistive transducers differ 90 degree of directions and place, and with center of rotation apart from equal.

4. a kind of magnetic resistance absolute type encoder according to claim 1, it is characterised in that: rosette is made a call to an aperture at eccentric direction or adds a metal derby in eccentric opposite direction.

5. a kind of magnetic resistance absolute type encoder according to claim 1, it is characterised in that: magnetoresistive transducer is connected with signal processor.