KR101725984B1 - Position detecting sensor and assembly thereof - Google Patents

Abstract

A sensing sensor and position sensing sensor assembly are disclosed. The position sensor according to an exemplary embodiment may include a measurer in which absolute position information is recorded according to a position resolution of n bits to be output and a sensor unit arranged to face the measurer and including n + 2 unit sensors have.

Description

[0001] POSITION DETECTING SENSOR AND ASSEMBLY THEREOF [0002]

The following description relates to a sensing sensor and a position sensing sensor assembly.

In order to recognize a constant distance or a rotation angle as an absolute position, a linear or rotary encoder may use an absolute position track using a random number table such as a pseudocode. It is possible to output the absolute position information of high resolution by integrating the incremental signal together with the absolute position information.

If the absolute position track is 4 bits, it can be divided into 16 intervals per 360 degrees of rotation. The inverse tangent can be calculated by using the sine wave of one period and the analog signal of the cosine wave output method for the divided region, and the accurate position can be calculated within one period (360 degrees / 16) Accurate location information can be output within 360 degrees by integrating with location information.

In order to detect such an absolute position track, an optical sensor, a magnetic sensor, an electric sensor, or the like may be used.

For example, Korean Patent Laid-Open Publication No. 2013-0061285 discloses a position sensor using magnetic induction. Wherein the position sensor is configured to uniformly maintain the flatness of the wing member so that the measured value of the sensor can be uniformly maintained.

An object of the present invention is to provide a position sensing sensor and a position sensing sensor assembly capable of recognizing a boundary of an absolute position track and improving the accuracy of position information recognition.

The above and other objects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

The position sensor according to an exemplary embodiment may include a sensor having position information recorded according to a position resolution of n bits to be output and a sensor unit disposed to face the sensor and including n + 2 unit sensors .

On one side, the sensor unit can recognize a first region, a second region, and a third region that is a boundary between the first region and the second region.

On one side, the unit sensors may be arranged in a columnar shape at intervals of 360 ÷ 2 ⁿ degrees.

On one side, the unit sensors may be linearly arranged at intervals of distance ÷ 2 ⁿ degrees to be measured.

On one side, the measurer may determine the position information using the n-bit pseudocode.

According to an embodiment of the present invention, there is provided a position sensor assembly including a main body, a shaft formed in a central portion of the main body, a measurer formed along the periphery of the shaft and having absolute position information recorded according to a positional resolution of n bits to be output, And a sensor unit disposed on the substrate and disposed to face the measurer, the sensor unit including n + 2 unit sensors.

The position sensing sensor and the position sensing sensor assembly according to an exemplary embodiment of the present invention may further include a unit sensor and recognize an intermediate interface, thereby improving the accuracy of the sensor regardless of the movement direction, speed, or the surrounding environment.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned may be clearly understood by those skilled in the art from the following description.

1 is a perspective view schematically illustrating a position sensing sensor assembly according to an embodiment.
Figure 2 illustrates a method for generating a 4-bit pseudo code.
Figure 3 illustrates how a sensor unit recognizes a 4-bit pseudo code measurer.

Hereinafter, embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments, detailed description of known functions and configurations incorporated herein will be omitted when it may make the best of an understanding clear.

In describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

1 is a perspective view schematically showing a position sensing sensor assembly 1 according to one embodiment.

Referring to FIG. 1, the position sensing sensor assembly 1 according to an embodiment may include a body portion 130 and a shaft 140. A hollow may be formed in the central portion of the body portion 130, and the shaft 140 may be positioned in the hollow. A substrate 160 may be disposed above the body portion 130. The substrate 160 may comprise a PCB substrate.

The measurer 110 may be formed along the circumference of the shaft 140.

The measurer 110 may record the absolute position information according to the position resolution of n bits to be output. The position information may include polarity, resistance, change in conductivity, and the like.

The polarity of the measurer 110 and the change of the electrical characteristic can be determined using a random number table using pseudo code (Pseducode). However, this is an example, and other methods other than pseudo code may be used.

The sensor unit 120 may be disposed to face the measurer 110, and may be located on the substrate 160.

The sensor unit 120 may include n + 2 unit sensors. n is the number of bits applied to the measurer, and the sensor unit 120 may include two more unit sensors than this. This may mean that the sensor unit 120 includes n + 2 or more unit sensors, and is not limited to n + 2.

FIG. 1 illustrates a case where absolute position information is recorded according to the position resolution of 4 bits, and the sensor unit 120 is provided by six unit sensors. Hereinafter, the case where 4 bits are applied will be mainly described for convenience of explanation. Which is illustrative and not limiting the number of bits.

The signal sensed by the sensor unit can be processed by a control unit (not shown), and the type of the control unit is not limited.

The position sensing sensor assembly 1 may further include a bracket 150 provided on one side of the main body 130. The bracket 150 can fix the body portion 130 to the object to be measured.

The pseudo code may be generated as an exclusive OR (EOR). The polynomial of Table 1 can be used for this purpose.

Resolution (Bits) Polynomial Period N

2

3 3

7 4

15 5

31 6

63 7

127 8

255 9

511 10

1023 11

2047 12

4095 13

8191 14

16383 15

32767 16

65535

Figure 2 illustrates a method for generating a 4-bit pseudo code.

Referring to FIG. 2, since an arbitrary initial value except for 0000 and 1111, which are all values of all four bits, is input and a polynomial corresponding to 4 bits of Table 1 is referenced, The exclusive OR can be performed on the orders a3 and a4. The pseudo code can be generated by inputting the resultant value into the lowest order term (a1), and moving the existing lowest order term by one order.

If there are more than 3 terms of the referenced polynomial for pseudo-code generation, the final value can be input to the lowest order by performing the exclusive-OR of the two orders from the highest order. For example, in the case of an 8-bit encoder, there are four order terms such as 8th order, 6th order, 5th order, and 4th order in the polynomial, so 8 bits and 6 bits are calculated as exclusive ORs, . After computing the recalculated value and the 4-bit value as an exclusive OR, the result value can be input to the 1-bit value.

Absolute position information requires 2 ⁿ pieces of information in the case of an n-bit encoder, but since the pseudo code is 2 ⁿ -1, the highest value is 1 and all other values are 0, the lowest value is 1, 2 ⁿ codes can be generated by placing a code with all zeros (track 9 below) between tracks of zero.

In this way, the pseudo code shown in Table 2 can be generated.

Track No a1 a2 a3 a4 One 0 One 0 One 2 One 0 One 0 3 One One 0 One 4 One One One 0 5 One One One One 6 0 One One One 7 0 0 One One 8 0 0 0 One 9 0 0 0 0 10 One 0 0 0 11 0 One 0 0 12 0 0 One 0 13 One 0 0 One 14 One One 0 0 15 0 One One 0 16 One 0 One One

With reference to the higher order (a4) of the pseudo code, 0 can be defined as an S pole and 1 can be defined as an N pole. Accordingly, the measurer 110 can be constituted by disposing permanent magnets or magnetizing polarities, respectively. However, the positional information of the measurer 110 according to the pseudo code is illustrative and is not limited to the above.

Figure 3 illustrates how a sensor unit recognizes a 4-bit pseudo code measurer.

Referring to FIG. 3, the polarity of the measurer 110 determined according to the pseudo code can be expressed as shown in FIG. The polarity of the measurer 110 may be formed by disposing a permanent magnet or through a magnetizing process.

The measurer 110 may be arranged in a columnar form. In this case, the polarity of the measurer 110 may be formed at intervals of 360 ÷ 2 ⁿ . The interval may be 360 ÷ 16 degrees and 22.5 degrees for 4 bits.

The measurer 110 and the sensor unit 120 may be arranged to face each other. The n + 2 unit sensors 121, 122, 123, 124, 125, and 126 may be disposed at the same interval as the polarity of the measurer 110. That is, the unit sensors may be arranged at intervals of 360 ÷ 2 ⁿ , and in the case of 4 bits, 6 unit sensors may be arranged at intervals of 22.5 degrees.

Alternatively, the measurer may have a polarity at an interval of ÷ 2 ⁿ degrees to be measured, and the sensor unit 120 may be linearly arranged at an interval of ÷ 2 ⁿ degrees to be measured. 3 shows a case where the measurer 110 and the sensor unit 120 are arranged in a linear manner.

However, the above intervals are not absolute and may include similar ranges.

Up to four unit sensors of the six unit sensors 121, 122, 123, 124, 125, and 126 may be positioned at the interface where the polarity changes. The two or more unit sensors may be positioned at the same interface with the front and rear polarities.

The sensor unit 120 can recognize the first area, the second area, and the third area that is the boundary between the first area and the second area. That is, the sensor unit 120 can recognize the measurer 110 as three regions.

For example, the first region may refer to the S pole of the measurer 110 and the second region may refer to the N pole of the measurer 110. The sensor unit 120 may have an output value of 0 for the first area and an output value of 1 for the second area. And in the third region which is the interface, it can have an output value of -1.

If the boundary value is not recognized, the sensor unit located at the interface of different polarities can judge the polarity depending on the moving direction or speed at the same position by the hysteresis phenomenon.

On the other hand, by further recognizing the boundary surface, it is possible to prevent the polarity judged according to the case from being changed, thereby improving the accuracy of the sensor.

However, this is an example, the first region necessarily means the S pole, or the first region does not necessarily have an output value of zero. The first region may denote the N pole or the second region may denote the S pole and may have an output value of 1 in the first region or an output value of -1 in the second region.

3 illustrates a case where the fifth unit sensor 125 and the sixth unit sensor 126 are located at the interface where the polarities of the front and the back are not changed.

It can be seen that the fifth unit sensor 125 and the sixth unit sensor 126 have an output value of 1 and face the N pole of the measurer 110. [ Since the fourth unit sensor 124 has an output value of -1, the fourth unit sensor is located between the N-pole and the S-pole, and the third unit sensor 123 has an output value of -1. It can be seen that the sensor 123 is located between the S-pole and the N-pole.

In this way, the positions of the first unit sensor 121 and the second unit sensor 122 can be grasped, and consequently the polarity of the measurer 110 can be grasped.

That is, the section is recognized as three regions, and the sensor unit includes n + 2 unit sensors, so that accurate position information can be recognized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments and equivalents to the claims are within the scope of the following claims.

110 Measurer
120 sensor unit
130 body portion
140 Shaft
150 bracket
160 substrate

Claims (6)

A measurer to which position information is recorded according to a position resolution of n bits to be output; And
And a sensor unit arranged to face the measurer and including n + 2 unit sensors,
The measurer records positional information at an interval of distance ÷ 2 ⁿ to be measured,
Wherein the unit sensors are linearly arranged at intervals of a distance ÷ 2n degrees to be measured.
The method according to claim 1,
Wherein the sensor unit is capable of recognizing a first region, a second region, and a third region that is a boundary between the first region and the second region.
delete delete The method according to claim 1,
Wherein the measurer determines position information using the n-bit pseudocode.
A body portion;
A shaft formed at a central portion of the main body;
A measurer formed along the circumference of the shaft and recording absolute position information according to a position resolution of n bits to be output;
A substrate disposed above the main body; And
And a sensor unit disposed on the substrate and arranged to face the measurer, the sensor unit including n + 2 unit sensors,
The measurer records position information at intervals of 360 ÷ 2 ⁿ degrees,
Wherein the unit sensors are disposed circumferentially at intervals of 360 占 2n degrees.

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