CN102486388B - 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

Accuracy of counting system of encoder method of testing

Technical field

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

Background technology

Scrambler is a kind of sensor that displacement in Industry Control and rotational angle are measured that is widely used in.Encoder output is generally made up of A and B two phase signals.When clockwise rotates and rotates counterclockwise, A, B item signal have different phase combination, and controller judges that according to different phase combination clockwise rotates or inverse clock rotates, as accompanying drawing 1.Such as, in the time there is rising edge in a-signal, if now B signal is low level signal, for clockwise rotates, if now B signal is high level, for inverse clock rotates.If the controller of reception & disposal code device signal is received clockwise and is rotated the rising edge or the negative edge signal that trigger, counter can be added to 1; If receive rising edge or the negative edge signal of counterclockwise triggering, counter can be subtracted to 1.Scrambler revolves turn around corresponding rising edge or negative edge trigger pip to be fixed.So controller by reference position relatively time Counter Value and end position hour counter value can calculate and obtain scrambler and turned over how many angles.If scrambler is connected with straight-line displacement movement transforming device by rotating, can turns over how many angles by understanding and know straight ahead or retreated how many distances.

Traditional checking accuracy of counting system of encoder method of testing has two kinds.

First method is to adopt encoder data capture card capturing and coding device signal simultaneously, whether correctly then carrys out the Counter Value of access control device by the Counter Value of comparing data capture card and the method for controller Counter Value.As accompanying drawing 2.There is following shortcoming in this method: 1. encoder data capture card signal input line and controller signals input line are connected in parallel, and can cause interference each other, cause count value miscount; 2. the correctness that relies on encoder data capture card, also likely there is the situation of majority or minority in scrambler capture card; 3. need to buy encoder data capture card.

The second method is to adopt a more high-precision scrambler 2 to be coaxially connected with original scrambler 1.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 encoder data capture card and process the signal of scrambler 2.The Counter Value of last comparison coder data collecting card Counter Value and controller, as Fig. 3.The shortcoming of this method is: need to buy high-precision scrambler and encoder data capture card 1.; 2. two scramblers coaxially need to be connected, make or buy special mechanical connecting element.

Summary of the invention

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

In order to solve above technical matters, the invention provides a kind of accuracy of counting system of encoder proving installation; Comprise: the cover overlapping on the axle of scrambler is relative static between cover and scrambler axle; Be positioned at the pointer putting, have a gauge point in the position of pointed.

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

The present invention also provides a kind of accuracy of counting system of encoder method of testing, comprises the following steps:

Step 1, on the axle of scrambler, put a cover, relative static between this cover and scrambler axle;

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

Step 3, take down pointer, allow 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 again, the Counter Value of writing down is now n;

Step 5, scrambler a the Counter Value that rotated a circle, if

remainder be 0, illustrate that encoder to count is correct.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.

Fig. 1 is encoder output schematic diagram;

Fig. 2 is current the first checking accuracy of counting system of encoder method of testing schematic diagram;

Fig. 3 is current the second checking accuracy of counting system of encoder method of testing schematic diagram;

Fig. 4 is the schematic diagram installing described in the embodiment of the present invention.

Embodiment

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

First, put a plastic jacket or wax cover on the axle of scrambler, this plastic jacket and wax cover can not have relative angle motion with scrambler axle; Then, insert a root pointer on plastic jacket, do a gauge point in the position of pointed, as Fig. 4, and record Counter Value is now m; Then, take down pointer, allow scrambler along with action element rotatablely moves, action element can be motor; After scrambler motion stops, pointer is inserted on the original jack of plastic jacket again, and manual rotation scrambler axle, making pointer arrow mark point again, the Counter Value of writing down is now n.A the Counter Value if scrambler has rotated a circle, if

remainder be 0, illustrate that encoder to count is correct.

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

Therefore no matter scrambler rotation is how many all, as long as beginning is consistent with final gauge point, the poor m-n of twice count value of scrambler should be just the integral multiple of a.Only have a kind of situation to occur error, may Counter Error just be equivalent to turn one week or a few week, but such probability of error is still lower more, calculates with scrambler 60 Counter Values that rotated a circle, the probability that this error occurs is 1/60 × 100%, is about 1.6%.360 Counter Values if scrambler has rotated a circle, the probability that this error occurs is 1/360 × 100%, is about 0.0027%.

The present invention is not limited to embodiment discussed above.Above the description of embodiment is intended in order to describe and illustrate the technical scheme the present invention relates to.Apparent conversion based on 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, to make those of ordinary skill in the art can apply numerous embodiments of the present invention and multiple alternative reaches object of the present invention.

Claims (1)

1. an accuracy of counting system of encoder method of testing, is characterized in that, comprises the following steps:

Step 1, on the axle of scrambler, put a cover, relative static between this cover and scrambler axle;

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

Step 3, take down pointer, allow 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 again, the Counter Value of writing down is now n;

Step 5, scrambler a the Counter Value that rotated a circle, if

remainder be 0, illustrate that encoder to count is correct.

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