CN102175270A - Low-voltage and direct-current Hall encoder - Google Patents
Low-voltage and direct-current Hall encoder Download PDFInfo
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- CN102175270A CN102175270A CN2011100449074A CN201110044907A CN102175270A CN 102175270 A CN102175270 A CN 102175270A CN 2011100449074 A CN2011100449074 A CN 2011100449074A CN 201110044907 A CN201110044907 A CN 201110044907A CN 102175270 A CN102175270 A CN 102175270A
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Abstract
The invention provides a low-voltage and direct-current Hall encoder, relating to the technical field of encoders. The encoder provided by the invention comprises an upper cover, an outer ring shell, gears and a fixing ring, wherein the upper cover, the outer ring shell, the gears and the fixing ring are connected integrally through a fixing bolt in sequence by taking the round center as the center; a PCB (printed circuit board) is arranged between the upper cover and the outer ring shell. The low-voltage and direct-current Hall encoder is characterized in that the PCB comprises a Hall gear sensor device, wherein the Hall gear sensor device is integrated with two Hall sensors, a magnetic steel sheet, a difference amplifier, a filter and a Schmidt trigger. The Schmidt trigger is used for digitizing a signal, and an opened collection electrode output circuit provides an output signal. The PCB is further integrated with functions of over-voltage protection, reversed polarity protection and electromagnetic interference resisting, thus the low-voltage and direct-current Hall encoder can be applied to the normal severe environment of vehicles with high measuring sensitivity, high precision and stable output signal.
Description
Technical field
The present invention relates to the encoder techniques field, be specifically related to a kind of low-voltage direct Hall scrambler.
Background technology
Scrambler is the precision measurement device that machinery and electronics are combined closely, and generally is applied to the measurement of mechanical angle, speed, position.It is converted to electronic signal (electronic pulse signal or serial data) by photovoltaic principals or electromagnetic principle with the geometric displacement amount of a machinery, this electronic signal need be connected to control system (e.g.PLC, high speed counting module, frequency converter etc.) usually, control system is through calculating the data that just can obtain measuring, so that carry out further work.But a Hall element only is installed generally on the existing magnetic coder; and it does not have overvoltage protection, reverse polarity protection and anti-electromagnetic interference function etc.; as can't keep high measurement sensitivity and precision in the common rugged surroundings of automobile, the output of signal is also unstable.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of can adapt to the common rugged surroundings of automobile, and keeps high measurement sensitivity and precision, the low-voltage direct Hall scrambler of stable output signal.
Technical matters to be solved by this invention realizes by the following technical solutions,
A kind of low-voltage direct Hall scrambler, comprise loam cake, outer annular shell, gear and set collar, described loam cake, outer annular shell, gear and set collar are that the center is linked to be an integral body successively by a set bolt with the center of circle, be provided with the PCB circuit board between described loam cake and the outer annular shell, it is characterized in that: comprise a Hall gear sensor device on the described PCB circuit board, integrated two Hall elements, magnetic links, a differential amplifier, a wave filter and a Schmidt trigger on the described Hall gear sensor device.
Described PCB circuit board is provided with an opener electrode output circuit, is used to provide output signal, also integrated overvoltage protection, reverse polarity protection and anti-electromagnetic interference function on the PCB circuit board, thereby can be applied in rugged surroundings common in the automobile.
Also be provided with an evaluation circuits on the described PCB circuit board, this circuit is only assessed the field intensity difference value, rather than absolute field intensity value, and the factors such as temperature drift, fabrication tolerance and magnetic field environment that this means can drop to minimum to the influence of measurement result.
Described two Hall elements are separated by 2.5 millimeters.
When this hall device is in the stationary magnetic field of any polarity, two Hall elements on it will produce same output signal.No matter the absolute strength in this magnetic field has muchly, and the difference between them always is zero.Yet owing to the gear teeth of an elemental area to magnetic field concentration, another unit, will produce a difference signal so, and amplify on chip if having magnetic field gradient between two Hall unit towards a backlash.In fact, this difference has embodied a little skew, and it can be revised by corresponding integrated controlling mechanism.This dynamic difference principle makes between sensor surface and the gear and exists than keeping high sensitivity under the condition of air gaps.
The invention has the beneficial effects as follows: the present invention goes out in conjunction with the design of measuring vehicle speed actual environment, measures sensitivity and precision height, and stable output signal can be applied in rugged surroundings common in the automobile.
Description of drawings
Fig. 1 is an assembly structure synoptic diagram of the present invention;
Fig. 2 is that the present invention assembles the back structural representation;
Fig. 3 is a circuit diagram of the present invention;
Fig. 4 is circuit theory diagrams of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
As shown in Figures 1 to 4, a kind of low-voltage direct Hall scrambler, comprise loam cake 1, outer annular shell 3, gear 6 and set collar 7, loam cake 1, outer annular shell 3, gear 6 and set collar 7 are that the center is linked to be an integral body successively by a set bolt 5 with the center of circle, be provided with PCB circuit board 2 between loam cake 1 and the outer annular shell 2, comprise a Hall gear sensor device on the PCB circuit board 2, integrated two Hall elements, magnetic links, a differential amplifier, a wave filter and a Schmidt trigger on the Hall gear sensor device.
The present invention is for the generation and the assessment of difference signal, here can the such typical case of the ferromagnetic gear of induction should be used for explaining, a permanent magnet that is installed in any end in the device back side produces a constant bias magnetic field, and two Hall elements in the device are separated by 2.5 millimeters.If temporarily another is in the face of backlash in the face of gear teeth for a sensor, these gear teeth will be as a flux device so, and it has increased magnetic flux density by this Hall element, produces a differential signal thus.Along with the rotation of gear, the polarity of this differential signal will change, and the speed of change is the same with the speed of conversion between the gear teeth and the backlash.
When zero crossing directly appeared at the center of these gear teeth or backlash, the edge of these gear teeth will produce maximum difference.When this difference surpasses upper limit threshold, output transistor will turn-off.Along with difference drops to lower threshold, transistor is opened.
Integrated Hi-pass filter utilizes a time constant to regulate this difference signal to zero on it, and this time constant can be set by an external capacitive.This mode is only assessed (minimum speed limit depends on capacitance) to those with the difference that minimum speed limit changes.Output signal is unqualified under stable state, and the precision that it reached will allow to exist little HO hysteresis and than air gaps (maximum 3.5 millimeters).
A gear can be characterized by its modulus: m=d/z.Wherein d is the tooth footpath, and z is a gear teeth quantity.The gear teeth are T to the distance of the gear teeth, and the computing formula of tooth pitch is T=π * m.When a Hall element in the face of gear teeth and another Hall element during in the face of a backlash, the difference maximum of sensing.In this device two Hall elements be spaced apart 2.5 millimeters, be 1 at modulus, corresponding tooth pitch is that this device can be sensed difference under 3.14 millimeters the condition.
The output signal of gear tooth sensor is a square wave, the linear transformation of each change representative from the gear teeth to the backlash of on off state.For the distance of reaction of the rectangle gear teeth (for example modulus 2) and 1 to 2 millimeter, the dutycycle of signal was almost 1: 1.For the digital form switching sequence also can be realized assessment by a microcontroller and software.These sensor signals are connected in two interruption inputs of microcontroller, meanwhile, with the lower cutoff frequency of software monitoring.
If being proportional to the voltage of speed generates with digital form, perhaps there is a microcomputer to can be used as digitial controller in the Xiang Guan system, the counting input end that gear sensor is connected to a microcontroller (for example, the external input terminals of counter 0 on 8051 single-chip microcomputers), export the rotational speed that the number of times of high/low transformation is just known gear by counting this sensor in definite time window (Twindow).
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. low-voltage direct Hall scrambler; comprise loam cake; outer annular shell; gear and set collar; described loam cake; outer annular shell; gear and set collar are that the center is linked to be an integral body successively by a set bolt with the center of circle; be provided with the PCB circuit board between described loam cake and the outer annular shell; it is characterized in that: comprise a Hall gear sensor device on the described PCB circuit board; integrated two Hall elements on the described Hall gear sensor device; magnetic links; a differential amplifier; a wave filter and a Schmidt trigger; described PCB circuit board is provided with an opener electrode output circuit; be used to provide output signal, also integrated overvoltage protection on the PCB circuit board; reverse polarity protection and anti-electromagnetic interference (EMI) module.
2. a kind of low-voltage direct Hall scrambler according to claim 1, it is characterized in that: described PCB circuit board is provided with an evaluation circuits.
3. a kind of low-voltage direct Hall scrambler according to claim 1 is characterized in that: described two Hall elements are separated by 2.5 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100449074A CN102175270A (en) | 2011-02-24 | 2011-02-24 | Low-voltage and direct-current Hall encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100449074A CN102175270A (en) | 2011-02-24 | 2011-02-24 | Low-voltage and direct-current Hall encoder |
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| Publication Number | Publication Date |
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| CN102175270A true CN102175270A (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100449074A Pending CN102175270A (en) | 2011-02-24 | 2011-02-24 | Low-voltage and direct-current Hall encoder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982622A (en) * | 2014-05-16 | 2014-08-13 | 江苏宇海环保设备有限公司 | Gear component |
| CN113674536A (en) * | 2021-10-20 | 2021-11-19 | 南通天正信息技术服务有限公司 | Lane detection system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3484036B2 (en) * | 1997-02-25 | 2004-01-06 | 三菱電機株式会社 | Magnetic sensor |
| CN2708257Y (en) * | 2004-04-23 | 2005-07-06 | 韩国Aoc株式会社 | Flow sensor |
| US7132824B2 (en) * | 2004-05-20 | 2006-11-07 | Konica Minolta Photo Imaging, Inc. | Position detector, camera-shake compensation mechanism, and image capture apparatus |
| CN201408199Y (en) * | 2009-03-26 | 2010-02-17 | 南京奥联汽车电子电器有限公司 | Rotating speed sensor for Hall gear |
| CN201438117U (en) * | 2009-05-04 | 2010-04-14 | 上海积致电子科技有限公司 | Coder |
| CN202048924U (en) * | 2011-02-24 | 2011-11-23 | 合肥德通科贸有限公司 | Low-voltage direct-current Hall encoder |
-
2011
- 2011-02-24 CN CN2011100449074A patent/CN102175270A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3484036B2 (en) * | 1997-02-25 | 2004-01-06 | 三菱電機株式会社 | Magnetic sensor |
| CN2708257Y (en) * | 2004-04-23 | 2005-07-06 | 韩国Aoc株式会社 | Flow sensor |
| US7132824B2 (en) * | 2004-05-20 | 2006-11-07 | Konica Minolta Photo Imaging, Inc. | Position detector, camera-shake compensation mechanism, and image capture apparatus |
| CN201408199Y (en) * | 2009-03-26 | 2010-02-17 | 南京奥联汽车电子电器有限公司 | Rotating speed sensor for Hall gear |
| CN201438117U (en) * | 2009-05-04 | 2010-04-14 | 上海积致电子科技有限公司 | Coder |
| CN202048924U (en) * | 2011-02-24 | 2011-11-23 | 合肥德通科贸有限公司 | Low-voltage direct-current Hall encoder |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982622A (en) * | 2014-05-16 | 2014-08-13 | 江苏宇海环保设备有限公司 | Gear component |
| CN113674536A (en) * | 2021-10-20 | 2021-11-19 | 南通天正信息技术服务有限公司 | Lane detection system |
| CN113674536B (en) * | 2021-10-20 | 2021-12-24 | 南通天正信息技术服务有限公司 | Lane detection system |
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Application publication date: 20110907 |