CN204313822U - A kind of novel measuring angle transducer - Google Patents

Abstract

The utility model discloses a kind of angular measurement sensor, comprise basic circle main body, distance measuring sensor and involute surface, involute surface is arranged on the axle side of basic circle main body, and distance measuring sensor is arranged on the position that can measure the change of involute surface distance.The utility model, based on involute urve generating principle, realizes measurement of angle by measuring generating line of involute length variations.After angle change, it is λ that distance measuring sensor measures length variations, according to formula the angle variable quantity that can ask.Angular measurement sensor of the present utility model obtains corresponding angle changing value by the length variations measuring generating line of involute, and this sensor construction is simple, and angle measurement accuracy is high, is easy to realize batch micro operations.

Description

A kind of novel measuring angle transducer

Technical field

The utility model is relevant with geometric measurement, is specifically related to a kind of novel measuring angle transducer, belongs to Precision Inspection and instrument field.

Background technology

Angle transducer is a kind of conventional geometric sense sensor, has and use widely in a lot of field such as Aero-Space, commercial production, machine-building and military science.The angular measurement sensor of main flow has photoelectric encoder, rotary transformer and disc type inductosyn in the market.

Photoelectric encoder is commonly called as Circular gratings, and angle information exports with the form of pulsed quantity by its Moire fringe utilizing Circular gratings to produce and photoelectric conversion technique.Compared with other angular measurement sensor, Circular gratings has the advantages such as volume is little, lightweight, angle measurement accuracy is high, fast response time, antijamming capability are strong, easy to use, is used widely in field of precision measurement.But because Circular gratings manufacturing process adopts photoetching process, circumference groove number is more, and measuring accuracy is also higher, and its manufacture difficulty is large, and cost is high, causes Circular gratings to hold at high price.Special for miniature precision instrument, be difficult to the measuring accuracy improving Circular gratings when radius is little.

Rotary transformer is commonly called as to revolve and becomes the angle measurement element of change that is a kind of output voltage with the change of rotor turns angle.It has advantage, widespread use and each fields of commercial production such as firm, heat-resisting, shock-resistant, antijamming capability is strong, fast response time, low cost of manufacture.The kind of rotary transformer is a lot, and wherein most widely used is sine and cosine resolver.Its principle is equivalent to a transformer that can rotate, along with angle change exports the cosine and sine signal relevant with rotor turns angle between stator to rotor.The angle measurement accuracy of such rotary transformer is usually 5 rads to 10 rads magnitudes.

Disc type inductosyn is a kind of angular transducer based on electromagnetic induction principle.The rotor of disc type inductosyn has N number of guide card.When rotor turns over angle θ, stator winding A and B responds to the corresponding induction electromotive force of output respectively.Inductosyn has amplitude discrimination type and phase demodulating type two kinds of working methods.Disc type inductosyn has degree of precision and resolving power, antijamming capability is strong, long service life, cost are lower, safeguard the features such as simple.

In three class angular transducers, the advantage of Circular gratings is that the dynamic measured is good, antijamming capability is strong, angle measurement accuracy is high, and shortcoming requires high to the machining precision of mechanical axis and installation accuracy, and its price is also relatively high.The advantage of rotary transformer is that cost is low, machining precision and installation accuracy low, shortcoming is that measuring accuracy is relatively low.Disc type inductosyn surveys that advantage is that low cost of manufacture, measuring accuracy are higher, machining precision and the low feature of installation accuracy.

The Circular gratings that current angle measurement accuracy is the highest, due to the restriction of photoetching process, cause Circular gratings angle measurement accuracy to be difficult to there is lifting again, particularly for minor radius Circular gratings, its angle measurement accuracy has become the key factor of restriction accuracy of instrument in a lot of fine measuring instrument.

Utility model content

The angle transducer measuring accuracy that the purpose of this utility model is to overcome prior art small volume is difficult to have the deficiency of lifting again, provides a kind of novel measuring angle transducer.

To achieve these goals, the utility model provides following technical scheme:

A kind of angular measurement sensor, comprise basic circle main body, distance measuring sensor and involute surface, involute surface is arranged on the axle side of basic circle main body, and distance measuring sensor is arranged on and can measures on the position of involute surface apart from change.Further, described basic circle main body is right cylinder, and involute surface is curved surface attached thereto, involute surface.Involute surface, has the feature of involute urve, is the structure derived by basic circle main body, and distance measuring sensor can be facilitated to carry out the mensuration of fall change.

When angular measurement sensor work of the present utility model, the angle of basic circle body rotation is first delivered on involute surface, then distance measuring sensor records involute surface and changes to the distance of distance measuring sensor test point, the corresponding corresponding angle change of size of distance change.Based on involute urve generating principle, realize measurement of angle by measuring generating line of involute length variations, its measuring principle as shown in Figure 1: after angle change α, it is λ that distance measuring sensor measures length variations.According to formula λ/r _bangle change α, the wherein r that can ask _bfor base radius.Angular measurement sensor of the present utility model obtains corresponding angle changing value by the length variations measuring generating line of involute, and this sensor construction is simple, and angle measurement accuracy is high, is easy to realize batch micro operations.

Compared with prior art, the beneficial effects of the utility model:

Angular measurement sensor of the present utility model obtains corresponding angle changing value by the length variations measuring generating line of involute, and this sensor construction is simple, and angle measurement accuracy is high, is easy to realize batch micro operations.

Accompanying drawing illustrates:

Fig. 1 is measurement of angle schematic diagram.

Fig. 2 is involute surface Distribution Principle figure.

Fig. 3 is flank of tooth Data Matching schematic diagram.

Mark in figure: 1-basic circle main body, 2-distance measuring sensor, 3-involute urve/involute surface, common test region on 301-involute surface, r _athe maximum radius of-involute urve, r _b-base radius, α-basic circle rotational angle.

Embodiment

The utility model can select different distance measuring sensors according to demand, and angle measurement accuracy is relevant with involute urve machining precision and distance measuring sensor precision.For the basic circle of diameter 10mm.The range error corresponding angle error of 0.1 μm is:

$\frac{\±0.0001}{\mathrm{\π}\×10}\×360\×3600=\±{4.1}^{\′\′}$

So the Circular gratings prior art of minor diameter is difficult to realize processing and manufacturing.

For major diameter angular transducer, measuring accuracy of the present utility model is high equally.With the angular measurement sensor of diameter 500mm, calculate with 500mm base radius, the range error corresponding angle error of 0.1 μm is:

$\frac{\±0.0001}{\mathrm{\π}\×500}\×360\×3600=\±0.08^{\′\′}$

So large diameter Circular gratings, precision reaches ± and 0.08 ", prior art is difficult to realize processing and manufacturing.

Further, described distance measuring sensor can be contact measuring head, also can be contactless gauge head.As laser interference formula distance measuring sensor, ultrasonic distance-measuring sensor, infrared distance measuring sensor.

Further, involute surface has multiple, and preferred multiple involute surface is for angularly distributing or being uniformly distributed.

Further, when the number of involute urve is n, the maximum radius of involute urve

Further, for avoiding single involute urve only can measure angle among a small circle, the utility model can also design involute surface to be had multiple.Preferably, being distributed as of these involute surfaces angularly distributes.As shown in Figure 2, design is distribution involute urve structure angularly, and the number of involute urve is n, then involute urve maximum radius is actual r _asuitably can get larger, press calculate theoretical r _a, r on this basis _aincrease 10%-50% amplitude, as 20%, 30%, 40%.Namely

Further, distance measuring equipment is arranged on the generation line direction of involute urve, and preferred distance measuring equipment range finding direction line is on the extended line of generation line of involute urve.Now be in vertical or subvertical state between piano wire with involute urve, test result accurately and reliably.Preferred, distance measuring equipment is laser ranging system, ultrasonic distance-measuring sensor or infrared distance measuring sensor.Adopt laser ranging system to test on the extended line of the generation line of involute urve, realized the mensuration of distance by laser interferometer.Namely distance measuring equipment piano wire now and basic circle tangent.

Further, involute urve is that curved-surface structure spiral is attached on basic circle cylinder.

Further, near involute surface, multiple distance measuring equipment is provided with.

Below in conjunction with test example and embodiment, the utility model is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the utility model is only limitted to following embodiment, all technology realized based on the utility model content all belong to scope of the present utility model.

Embodiment 1

First select as required suitable distance measuring sensor, be described for laser interference range finding.According to involute urve each point X and Y-coordinate under involute equation generation rectangular coordinate system, generate involute surface with wire cutting machine processing.Time processing can the involute surface of the some same precision same sizes of Mass production.Laser interference distance measuring equipment is arranged on the generation line direction of involute urve, namely the measurement laser of laser interference distance measuring equipment and basic circle tangent.Now laser is on the generation line extended line of involute urve.Distance change now by measuring laser interferometer can obtain for angle changing value.After angle change α, it is λ that distance measuring sensor measures length variations.According to formula λ/r _bangle change α, the wherein r that can ask _bfor base radius.

Embodiment 2

Involute urve is distributed as and angularly distributes, and as shown in Figure 2, involute urve has multiple, adds up to n=11, then the theoretical maximum radius of involute urve is r _aaccording to formula calculate.Actual r _asuitably can get larger, increase by 1.2 times that 20% gets calculated value.

As shown in Figure 3, involute urve is the curved-surface structure that wire cutting machine processing generates, curved-surface structure presents spiral style, the spiral formula curved surface of multiple symmetry is set, there is multiple involute urve structure division, multiple distance measuring sensor is set accordingly, the change of Simultaneously test distance, obtain multiple data, then process obtains accurate angle changing value.

Further, same involute surface is provided with multiple distance measuring sensor, the change of Simultaneously test distance, Simultaneously test solves average value.

Above embodiment only in order to the utility model is described and and technical scheme described by unrestricted the utility model, although this instructions has been described in detail the utility model with reference to each above-mentioned embodiment, but the utility model is not limited to above-mentioned embodiment, therefore anyly the utility model is modified or equivalent to replace; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of utility model, it all should be encompassed in the middle of right of the present utility model.

Claims (10)

1. an angular measurement sensor, comprises basic circle main body, distance measuring sensor and involute surface, and involute surface is arranged on the axle side of basic circle main body, and distance measuring sensor is arranged on the position that can measure the change of involute surface distance.

2. angular measurement sensor according to claim 1, it is characterized in that, described basic circle main body is right cylinder, and involute surface is curved surface attached thereto, involute surface.

3. angular measurement sensor according to claim 1, it is characterized in that, described distance measuring sensor is contact measuring head.

4. angular measurement sensor according to claim 1, it is characterized in that, described distance measuring sensor is contactless gauge head.

5. angular measurement sensor according to claim 4, it is characterized in that, described distance measuring sensor is laser interference formula distance measuring sensor, ultrasonic distance-measuring sensor or infrared distance measuring sensor.

6. angular measurement sensor according to claim 1, it is characterized in that, involute surface has multiple, and preferred multiple involute surface is for angularly distributing or being uniformly distributed.

7. angular measurement sensor according to claim 6, is characterized in that, when the number of involute urve is n, and the maximum radius of involute urve $r_a\≥\sqrt{{\left(\frac{2\×\mathrm{\π}\×r_b}{n}\right)}^2+{r_b}^2};$ R _bfor base radius.

8. angular measurement sensor according to claim 7, is characterized in that,

9. angular measurement sensor according to claim 1, it is characterized in that, distance measuring equipment is arranged on the generation line direction of involute urve, and preferred distance measuring equipment range finding direction line is on the extended line of generation line of involute urve.

10. angular measurement sensor according to claim 1, it is characterized in that, involute urve is that curved-surface structure spiral is attached on basic circle cylinder.