CN101696979A - Non-contact differential type speed encoder - Google Patents
Non-contact differential type speed encoder Download PDFInfo
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- CN101696979A CN101696979A CN200910209444A CN200910209444A CN101696979A CN 101696979 A CN101696979 A CN 101696979A CN 200910209444 A CN200910209444 A CN 200910209444A CN 200910209444 A CN200910209444 A CN 200910209444A CN 101696979 A CN101696979 A CN 101696979A
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Abstract
The invention provides a non-contact differential type speed encoder, which is positioned on the outside of gear teeth of a speed measuring gear and comprises a magnetic element and hall elements, wherein the hall elements are arranged on/in a shell and symmetrically distributed, and two hall elements are symmetrically distributed. The hall elements output high levels when meeting a strong magnetic field and output low levels when meeting a weak magnetic field. The backs of the hall elements generate a magnetic field by using a permanent magnet. When gaps of the gear aim at the hall elements, magnetic lines of force are dispersed and the hall elements output the low levels; and when the teeth of the gear aim at the hall elements, magnetic lines of force are concentrated and the hall elements output the high levels. Thus, the higher the rotation speed of the gear is, the higher the frequency of output signals is. Then the rotation speed of a motor can be detected. Because the gear is not in contact with a detection element, the non-contact differential type speed encoder has no mechanical friction and has long service life; and because dust, water and the like do not affect work, the non-contact differential type speed encoder has strong adaptation to environment. In addition, because the gear can be arranged outside the motor, a hot environment in the motor is avoided.
Description
Technical field
The present invention relates to a kind of variable-frequency motor, a kind of specifically speed encoder that is applied on the variable-frequency motor.
Background technology
In variable-frequency motor, all need on motor, adorn scrambler and be used for detecting rotating speed of motor and direction.
The current encoder device is the monopolization of external major company, and price is very expensive, and institute's accounting row are too high in motor cost.
Because the detecting element of present scrambler mostly directly contacts with gear, so the mechanical friction meeting greatly reduces the life-span of scrambler.
Based on the problems referred to above, it is very necessary to develop long scrambler of a kind of low cost, high reliability and life-span.
Summary of the invention
The purpose of this invention is to provide the speed encoder that a kind of gear and detecting element do not contact, solve gear of using always and the scrambler that detecting element directly contacts make the life-span reduction because of mechanical friction problem.
The objective of the invention is to be achieved through the following technical solutions:
A kind of non-contact differential type speed encoder is positioned at outside the gear teeth of measure speed gears, comprises magnetic element and Hall element, Hall element is installed on the housing/in, described Hall element symmetric arrangement, described housing adopt plastics or other insulating material to make, and Hall element adopts two symmetric arrangement.
Magnetic element is positioned at the outside of Hall element, and magnetic element is a permanent magnet, and the magnetic direction of permanent magnet is vertical with Hall element.
Output high level when Hall element runs into high-intensity magnetic field, output low level during low-intensity magnetic field.
The back side of Hall element produces a magnetic field with permanent magnet, and when the gap alignment Hall element of gear, the magnetic line of force is disperseed, the Hall element output low level, and when gear teeth was aimed at Hall element, it is concentrated that the magnetic line of force becomes, Hall element output high level.Like this, gear rotational speed is high more, and output signal frequency is also just high approximately, can detect rotating speed of motor like this.
Gear does not contact with detecting element, does not so just have mechanical friction, and the life-span is long.
Adaptive faculty to environment is strong, and dust, water etc. can not influence work.
Gear can be contained in the outside of motor, avoids the hot environment of motor internal.
Description of drawings
With embodiment the present invention is described in further detail with reference to the accompanying drawings below.
Fig. 1 is the structural representation of the described non-contact differential type speed encoder of the embodiment of the invention
Among the figure:
1, magnetic element; 2, housing; 3, Hall element; 4, measure speed gears.
Embodiment
As shown in Figure 1, non-contact differential type speed encoder of the present invention, be positioned at the gear teeth outside of measure speed gears 4, comprise magnetic element 1 and Hall element 3, Hall element 3 is installed on the housing 2/in, described Hall element 3 symmetric arrangement, described housing 2 adopts plastics or other insulating material to make, and Hall element 3 adopts two symmetric arrangement.
Magnetic element 1 is positioned at the outside of Hall element 3, and magnetic element 1 is a permanent magnet, and the magnetic direction of permanent magnet is vertical with Hall element 3.
Output high level when Hall element 3 runs into high-intensity magnetic field, output low level during low-intensity magnetic field.
The back side of Hall element 3 produces a magnetic field with permanent magnet, and when the gap alignment Hall element 3 of gear, the magnetic line of force is disperseed, Hall element 3 output low levels, and when gear 4 teeth were aimed at Hall element, it is concentrated that the magnetic line of force becomes, Hall element 3 output high level.Like this, gear 4 rotating speeds are high more, and output signal frequency is also just high approximately, can detect rotating speed of motor like this.
Technological difficulties of the present invention comprise:
The duty temperature influence of 1 Hall element own is obvious, even when spending such as 20 and 50 corresponding same magnetic fields when spending, output also can be different.
The changes of magnetic field of 2 permanent magnets, magnetic field, long back of the magnetic field time of permanent magnet can die down.
3 accuracies of gear are had relatively high expectations, and the width of tooth will be always.
The concentricity requirement of 4 pairs of gears is higher, and the gear decentraction will influence the variation in magnetic field, and then electric signal output is influenced.
The solution of above-mentioned technological difficulties:
Adopt two Hall element I, II arranged side by side to detect simultaneously, suppose that the detected useful signal of I is A, the detected signal of II is B.
Because two elements are in the same environment, so because temperature variation, " interference " that the deviation that the inhomogeneous grade of gear decentraction gear is caused produces on two elements also is the same, can represent with C.
So becoming behind two signal subtractions: (A+C)-(B+C)=A-B, output signal becomes and disturbs that it doesn't matter, just with to connect a true detected signal of Hall element relevant.
So through after the above-mentioned design, the technique effect that the present invention reaches is:
Gear does not contact with detecting element, does not so just have mechanical friction, and the life-span is long.
Adaptable to environment, dust, water etc. can not affect work.
Gear can be contained in the outside of motor, avoids the hot environment of motor internal.
Claims (3)
1. non-contact differential type speed encoder is positioned at the gear teeth outside of measure speed gears, it is characterized in that, comprises magnetic element and Hall element, and Hall element is installed on the housing/in, described Hall element symmetric arrangement.
2. non-contact differential type speed encoder according to claim 1 is characterized in that magnetic element is positioned at the outside of Hall element, and magnetic element is a permanent magnet, and the magnetic direction of permanent magnet is vertical with Hall element.
3. non-contact differential type speed encoder according to claim 1 is characterized in that, Hall element adopts two symmetric arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910209444A CN101696979A (en) | 2009-10-30 | 2009-10-30 | Non-contact differential type speed encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910209444A CN101696979A (en) | 2009-10-30 | 2009-10-30 | Non-contact differential type speed encoder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101696979A true CN101696979A (en) | 2010-04-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910209444A Pending CN101696979A (en) | 2009-10-30 | 2009-10-30 | Non-contact differential type speed encoder |
Country Status (1)
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| CN (1) | CN101696979A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486384A (en) * | 2010-12-06 | 2012-06-06 | 沈阳理工大学 | Solar wireless multiturn coder |
| CN102826179A (en) * | 2012-07-28 | 2012-12-19 | 成都宽和科技有限责任公司 | Sensing element with adjustable positions and magnetic fluxes of magnetic blocks in shell |
| CN102826176A (en) * | 2012-07-28 | 2012-12-19 | 成都宽和科技有限责任公司 | Turntable sensing element with adjustable magnetic fluxes of magnetic blocks and points |
| CN102826186A (en) * | 2012-07-28 | 2012-12-19 | 成都宽和科技有限责任公司 | Rotary table type sensor provided with magnetic blocks with adjustable positions and magnetic fluxes for booster bicycle |
| CN103776495A (en) * | 2014-02-24 | 2014-05-07 | 安徽理工大学 | Non-contact type gear rotational speed detection experimental device |
| CN105572411A (en) * | 2016-01-08 | 2016-05-11 | 华南农业大学 | Differential type anti-strong-interference real time velometer based on Arduino, and control method thereof |
| CN105905764A (en) * | 2016-06-15 | 2016-08-31 | 上海三菱电梯有限公司 | Elevator traction machine |
| CN107317436A (en) * | 2016-04-27 | 2017-11-03 | 蒂森克虏伯电梯（上海）有限公司 | A kind of permanent magnetic synchronous traction machine |
| CN110658354A (en) * | 2018-06-28 | 2020-01-07 | 英飞凌科技股份有限公司 | Sensor device and method for producing a sensor device |
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| CN2775610Y (en) * | 2005-03-04 | 2006-04-26 | 长沙锐星舞台声光设备厂 | Angular transducer |
| CN1932523A (en) * | 2006-07-21 | 2007-03-21 | 杭州术通高端仪器有限公司 | Electric machine internal mean value filter trigger velometer |
| CN201527431U (en) * | 2009-10-30 | 2010-07-14 | 无锡新大力电机有限公司 | Non-contact differential speed encoder |
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Patent Citations (3)
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| CN2775610Y (en) * | 2005-03-04 | 2006-04-26 | 长沙锐星舞台声光设备厂 | Angular transducer |
| CN1932523A (en) * | 2006-07-21 | 2007-03-21 | 杭州术通高端仪器有限公司 | Electric machine internal mean value filter trigger velometer |
| CN201527431U (en) * | 2009-10-30 | 2010-07-14 | 无锡新大力电机有限公司 | Non-contact differential speed encoder |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102486384A (en) * | 2010-12-06 | 2012-06-06 | 沈阳理工大学 | Solar wireless multiturn coder |
| CN102826179A (en) * | 2012-07-28 | 2012-12-19 | 成都宽和科技有限责任公司 | Sensing element with adjustable positions and magnetic fluxes of magnetic blocks in shell |
| CN102826176A (en) * | 2012-07-28 | 2012-12-19 | 成都宽和科技有限责任公司 | Turntable sensing element with adjustable magnetic fluxes of magnetic blocks and points |
| CN102826186A (en) * | 2012-07-28 | 2012-12-19 | 成都宽和科技有限责任公司 | Rotary table type sensor provided with magnetic blocks with adjustable positions and magnetic fluxes for booster bicycle |
| CN102826186B (en) * | 2012-07-28 | 2014-02-05 | 成都宽和科技有限责任公司 | Rotary table type sensor provided with magnetic blocks with adjustable positions and magnetic fluxes for power-assisted bicycle |
| CN103776495B (en) * | 2014-02-24 | 2016-08-17 | 安徽理工大学 | A kind of contactless gear rotational speed test experience device |
| CN103776495A (en) * | 2014-02-24 | 2014-05-07 | 安徽理工大学 | Non-contact type gear rotational speed detection experimental device |
| CN105572411A (en) * | 2016-01-08 | 2016-05-11 | 华南农业大学 | Differential type anti-strong-interference real time velometer based on Arduino, and control method thereof |
| CN105572411B (en) * | 2016-01-08 | 2019-02-12 | 华南农业大学 | The anti-strong jamming real time speed measuring device of differential type and control method based on Arduino |
| CN107317436A (en) * | 2016-04-27 | 2017-11-03 | 蒂森克虏伯电梯（上海）有限公司 | A kind of permanent magnetic synchronous traction machine |
| CN105905764A (en) * | 2016-06-15 | 2016-08-31 | 上海三菱电梯有限公司 | Elevator traction machine |
| CN110658354A (en) * | 2018-06-28 | 2020-01-07 | 英飞凌科技股份有限公司 | Sensor device and method for producing a sensor device |
| US11150260B2 (en) | 2018-06-28 | 2021-10-19 | Infineon Technologies Ag | Sensor devices and methods for producing sensor devices |
| CN110658354B (en) * | 2018-06-28 | 2022-02-15 | 英飞凌科技股份有限公司 | Sensor device and method for producing a sensor device |
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Application publication date: 20100421 |