CN102486388A - Device and method for testing accuracy of counting system of encoder - Google Patents

Abstract

The invention discloses a device for testing the accuracy of a counting system of an encoder. The device for testing the accuracy of the counting system of the encoder comprises a sleeve sleeved on a shaft of the encoder and an indicator positioned on the sleeve, wherein the sleeve and the shaft of the encoder are in relative rest, and a mark point is marked at the position indicated by the indicator. By the invention, the accuracy of a controller in the counting of signals of encoder can be simply and reliably verified, and the error rate is lower.

Description

Encoder to count system correctness proving installation and method

Technical field

The displacement that the present invention relates to often relate in the Industry Control and rotational angle device for accurately measuring and method.

Background technology

Scrambler is a kind of displacement and rotational angle measured sensor that is widely used in the Industry Control.Encoder output generally is made up of A and B two phase signals.A, B item signal had different phase and make up when clockwise rotated and rotates counterclockwise, and controller rotates still inverse clock rotation according to different phase combination judgement clockwise, like accompanying drawing 1.Such as, when rising edge appears in a-signal, if this moment, the B signal was a low level signal, then for clockwise rotates, if the B signal is high level then is that inverse clock rotates at this moment.Receive that clockwise rotates rising edge or the negative edge signal that triggers, and then can add 1 with counter if receive the controller of handling code device signal; If receive the rising edge or the negative edge signal of counterclockwise triggering, then can counter be subtracted 1.Scrambler revolves turn around corresponding rising edge or negative edge trigger pip to be fixed.So controller through reference position relatively the time Counter Value then can calculate the acquisition scrambler with end position hour counter value and turned over how many angles.If scrambler links to each other with the straight-line displacement movement transforming device through rotating, then can turn over how many angles and know straight ahead or retreated how many distances through understanding.

Traditional checking encoder to count system correctness method of testing has two kinds.

Whether first method is to adopt encoder data capture card capturing and coding device signal simultaneously, come the Counter Value of access control device correct through the Counter Value of comparing data capture card and the method for controller Counter Value then.Like accompanying drawing 2.There is following shortcoming in this method: 1. encoder data capture card signal input line and controller signals incoming line are connected in parallel, and can cause interference each other, cause the count value miscount; 2. rely on the correctness of encoder data capture card, the situation of most or minority also might appear in the scrambler capture card; 3. need to buy the encoder data capture card.

Second method is to adopt a more high-precision scrambler 2 and original 1 coaxial connection of scrambler.Such as, scrambler originally rotates a circle and can produce 60 rising edges or negative edge, and scrambler more rotates a circle and can produce 600 rising edges or negative edge.Re-use the encoder data capture card and handle the signal of scrambler 2.The Counter Value of last comparison coder data collecting card Counter Value and controller is like Fig. 3.The shortcoming of this method is: need to buy high-precision scrambler and encoder data capture card 1.; 2. need special mechanical connecting element be made or bought in two coaxial connections of scrambler.

Summary of the invention

Technical matters to be solved by this invention provides a kind of encoder to count system correctness proving installation, and the access control device that it can be simple and reliable is to the correctness of code device signal counting.

In order to solve above technical matters, the invention provides a kind of encoder to count system correctness proving installation; Comprise: the cover that on the axle of scrambler, is overlapping is static relatively between cover and the coder shaft; Be positioned at the pointer that puts, a gauge point is arranged in the position of pointed.

Beneficial effect of the present invention is: access control device that can be simple and reliable is to the correctness of code device signal counting, and error is lower.

The present invention also provides a kind of encoder to count system correctness method of testing, may further comprise the steps:

Step 1, on the axle of scrambler, put a cover, this cover is static relatively between coder shaft;

Step 2, insert a root pointer putting, do a gauge point in the position of pointed, and the Counter Value of record this moment is m;

Step 3, take down pointer, let scrambler along with action element rotatablely moves;

Step 4, after scrambler motion stops, pointer being inserted on the original jack of plastic jacket again, and rotary coder shaft, make pointer arrow mark point once more, the Counter Value of writing down this moment is n;

Step 5, scrambler a the Counter Value that rotated a circle; If the remainder of

is 0, explain that then encoder to count is correct.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.

Fig. 1 is the encoder output synoptic diagram;

Fig. 2 is present first kind of checking encoder to count system correctness method of testing synoptic diagram;

Fig. 3 is present second kind of checking encoder to count system correctness method of testing synoptic diagram;

Fig. 4 is the said schematic representation of apparatus of the embodiment of the invention.

Embodiment

The present invention comes the correctness of access control device to the code device signal counting through a kind of simple and reliable method.If counting is correct, displacement that count value is corresponding and rotational angle just can accurately be measured.As shown in Figure 4, the said encoder to count of embodiment of the invention system correctness proving installation; Be included in the plastic jacket or the wax cover that are overlapping on the axle of scrambler, static relatively between plastic jacket or wax cover and the coder shaft, that is to say that plastic jacket and wax cover can not have the relative angle motion with coder shaft; Be positioned at plastic jacket or wax has put pointer, a gauge point is arranged in the position of pointed.

At first, on the axle of scrambler, put a plastic jacket or wax cover, this plastic jacket and wax cover can not have the relative angle motion with coder shaft; Then, on plastic jacket, insert a root pointer, do a gauge point in the position of pointed, like Fig. 4, and record Counter Value at this moment is m; Then, take down pointer, let scrambler along with action element rotatablely moves, action element can be a motor; After the scrambler motion stops, pointer is inserted on the original jack of plastic jacket again, and manual rotary coder shaft, making pointer arrow mark point once more, the Counter Value of writing down this moment is n.A Counter Value if scrambler has rotated a circle; If the remainder of

is 0, explain that then encoder to count is correct.

The present invention only on coder shaft, increases an axle sleeve and pointer just can be verified the encoder to count correctness.The reliability of this verification method is also quite high, has only when counting error just in time is the several times of a and can think that just the encoder to count system counts is correct by mistake.So the correctness of using this method validation is

Therefore no matter how much all the scrambler rotation is, as long as beginning is consistent with final gauge point, the poor m-n of twice count value of scrambler just should be the integral multiple of a.Have only a kind of situation error to occur; Promptly maybe Counter Error just be equivalent to change all or several weeks, but such probability of error is still lower more, calculates with scrambler 60 Counter Values that rotated a circle; The probability that this error takes place is 1/60 * 100%, is about 1.6%.360 Counter Values if scrambler has rotated a circle, the probability that this error takes place is 1/360 * 100%, is about 0.0027%.

The present invention is not limited to the embodiment that preceding text are discussed.More than the description of embodiment is intended in order to describe and explain the technical scheme that the present invention relates to.Based on the conspicuous conversion of the present invention enlightenment or substitute and also should be considered to fall into protection scope of the present invention.Above embodiment is used for disclosing best implementation method of the present invention, so that those of ordinary skill in the art can use numerous embodiments of the present invention and multiple alternative reaches the object of the invention.

Claims (3)

1. encoder to count system correctness proving installation; It is characterized in that, comprising:

The cover that on the axle of scrambler, is overlapping is static relatively between cover and the coder shaft;

Be positioned at the pointer that puts, a gauge point is arranged in the position of pointed.

2. encoder to count as claimed in claim 1 system correctness proving installation is characterized in that, the said cover that on the axle of scrambler, is overlapping is plastic jacket or wax cover.

3. an encoder to count system correctness method of testing is characterized in that, may further comprise the steps:

Step 1, on the axle of scrambler, put a cover, this cover is static relatively between coder shaft;

Step 2, insert a root pointer putting, do a gauge point in the position of pointed, and the Counter Value of record this moment is m;

Step 3, take down pointer, let scrambler along with action element rotatablely moves;

Step 4, after scrambler motion stops, pointer being inserted on the original jack of plastic jacket again, and rotary coder shaft, make pointer arrow mark point once more, the Counter Value of writing down this moment is n;

Step 5, scrambler a the Counter Value that rotated a circle; If the remainder of

is 0, explain that then encoder to count is correct.

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