CN201780305U - High-speed motor speed measuring circuit - Google Patents
High-speed motor speed measuring circuit Download PDFInfo
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- CN201780305U CN201780305U CN2010202548179U CN201020254817U CN201780305U CN 201780305 U CN201780305 U CN 201780305U CN 2010202548179 U CN2010202548179 U CN 2010202548179U CN 201020254817 U CN201020254817 U CN 201020254817U CN 201780305 U CN201780305 U CN 201780305U
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Abstract
The utility model discloses a high-speed motor speed measuring circuit, which is characterized in that a motor speed sensor is connected to a filter circuit unit, the filter circuit unit is connected with a comparison/shaping circuit unit, the comparison/shaping circuit unit is connected with an optically coupled isolation circuit unit, and then the optically coupled isolation circuit unit is connected to a DSP/QEP unit. The high-speed motor speed measuring circuit has the characteristics of high accuracy and capability of measuring the revolving speed of a high-speed motor and avoiding the interference of control circuits, and the like, is easy in implementation, and can adapt to speed sensors for sine wave or square signal output in different voltage grades through adjustment.
Description
Technical field
The utility model relates to the circuit that a kind of DSP/QEP of use carries out motor speed measurement, can be widely used in various fields such as measurement and control system.
Background technology
In the closed-loop control system of motor, owing to need to obtain in real time rotating speed of motor information, at a high speed, high-precision sensor and corresponding treatment circuit be absolutely necessary.Speed pickup sine wave output or square-wave signal are realized high resolving power, high-precision test easily, have obtained using widely in the modern electrical machine detection technique.The DSP of TI company 2000 series controls one of state-of-the-art processor in field at present, the frequency of operation of its last word is up to 150MHz, the control accuracy of control system and the ability of real-time process information have been improved greatly, being used to motor position and tachometric survey of its distinctive QEP circuit and speed pickup provides perfect solution, but for high-speed electric expreess locomotive, the measurement of normal signal treatment circuit occurs crosstalking and the phenomenon of pulse-losing.
Summary of the invention
For above-mentioned phenomenon, designed a kind of high-speed electric expreess locomotive tachometric survey circuit, concrete technical scheme of the present utility model is: speed pickup is connected to the filtering circuit unit, the filtering circuit unit connects relatively shaping circuit unit, relatively the shaping circuit unit connects the optical coupling isolation circuit unit, and the optical coupling isolation circuit unit is received the DSP/QEP unit again.
This circuit adopts high speed amplifier and high speed photo coupling, and comprise the filtering circuit unit signal (sine wave or square wave) of speed pickup output is carried out Filtering Processing, interference beyond the rejection frequency scope band, again through comparing the shaping circuit unit, signal waveform is shaped as square wave, by the optical coupling isolation circuit circuit, signal is imported the DSP/QEP unit at last.
Utilize ripe principle and technology during design circuit as far as possible, the chip of selection is guaranteeing under the prerequisite that every technical indicator meets the requirements, and preferentially selects chip commonly used, that be familiar with for use, has improved the reliability of system as far as possible.Filter range of this circuit and input voltage range scalable.
The beneficial effects of the utility model are: it is simple that this circuit has method for designing, and debugging is convenient, and circuit parameter is accurate, and circuit is reliable and stable, avoids front stage circuits to disturb, and characteristic of accurate tests the speed.Lose pulse when making high speed and be mixed with control aspect such as crosstalk and be improved.
Description of drawings
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Among Fig. 1,1 speed pickup, 2, the filtering circuit unit, 3, shaping circuit unit relatively, 4, the optical coupling isolation circuit unit, 5, the DSP/QEP unit.
Embodiment
As shown in Figure 1: this circuit comprises filtering circuit unit 2 to the processing of speed pickup 1 output signal, compares shaping circuit unit 3, optical coupling isolation circuit unit 4 three parts, and final signal is input to DSP/QEP unit 5.
The concrete circuit theory of the utility model as shown in Figure 2, this circuit can be handled the two-way rate signal, and amplitude less than the signal of 15V (no matter sine wave or square wave), is inserted FCAP, OUTF1 is that the square-wave signal of VOUT is to the DSP/QEP pin with output amplitude.
Below will illustrate respectively inserting sine wave and square-wave signal,
The a sinusoidal signal: when inserting sine wave signal, resistance R 1 and R6 do not weld, and sinusoidal rate signal enters amplifier through after the filtering, and relatively the back output signal is a square-wave signal, through behind the optical coupling isolation circuit, carries out filtering, outputs to the DSP/QEP pin.
B square-wave signal: when inserting square-wave signal,, can obtain the relatively magnitude of voltage of pin of amplifier by regulating resistance R 1, R2 and R6, R7, after relatively, the square-wave signal of input is by shaping, again by after the light-coupled isolation, carry out filtering, output to the DSP/QEP pin.
Simultaneously, external photoelectric encoder can be measured quadrature coding pulse, timer timing pulse and counting direction sequential logic by DSP, determines the position and the rotating speed of motor.
The above; it only is the preferable embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and utility model design thereof, all should be encompassed within the protection domain of the present utility model.
Claims (1)
1. high-speed electric expreess locomotive tachometric survey circuit, it is characterized in that: motor speed sensor (1) is connected to filtering circuit unit (2), filtering circuit unit (2) connects relatively shaping circuit unit (3), relatively shaping circuit unit (3) connect optical coupling isolation circuit unit (4), and optical coupling isolation circuit unit (4) receive DSP/QEP unit (5) again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202548179U CN201780305U (en) | 2010-07-07 | 2010-07-07 | High-speed motor speed measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202548179U CN201780305U (en) | 2010-07-07 | 2010-07-07 | High-speed motor speed measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201780305U true CN201780305U (en) | 2011-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202548179U Expired - Fee Related CN201780305U (en) | 2010-07-07 | 2010-07-07 | High-speed motor speed measuring circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN201780305U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138718A (en) * | 2011-11-24 | 2013-06-05 | 中国北车股份有限公司大连电力牵引研发中心 | Device and method for processing signals and electric locomotive |
| CN103401660A (en) * | 2013-08-05 | 2013-11-20 | 江苏唐恩科技有限公司 | Orthogonal signal decoding system and method based on Cortex core single-chip microcomputer |
| CN105005226A (en) * | 2015-07-22 | 2015-10-28 | 株洲南车时代电气股份有限公司 | Locomotive frequency signal input acquisition circuit |
| CN106546762A (en) * | 2016-11-02 | 2017-03-29 | 北京机械设备研究所 | A kind of measurement of rotating speed circuit method of work in asynchronous generator power-generating control system |
| CN107328951A (en) * | 2017-08-21 | 2017-11-07 | 安徽中家智康科技有限公司 | It is a kind of that the method for reducing frequency-changeable compressor tachometric survey error is realized by dividing measurement |
-
2010
- 2010-07-07 CN CN2010202548179U patent/CN201780305U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138718A (en) * | 2011-11-24 | 2013-06-05 | 中国北车股份有限公司大连电力牵引研发中心 | Device and method for processing signals and electric locomotive |
| CN103138718B (en) * | 2011-11-24 | 2016-08-31 | 中国北车股份有限公司 | Signal processing apparatus, processing method and electric locomotive |
| CN103401660A (en) * | 2013-08-05 | 2013-11-20 | 江苏唐恩科技有限公司 | Orthogonal signal decoding system and method based on Cortex core single-chip microcomputer |
| CN103401660B (en) * | 2013-08-05 | 2016-09-07 | 江苏唐恩科技有限公司 | The decoding system and method for orthogonal signalling based on Cortex kernel single-chip microcomputer |
| CN105005226A (en) * | 2015-07-22 | 2015-10-28 | 株洲南车时代电气股份有限公司 | Locomotive frequency signal input acquisition circuit |
| CN105005226B (en) * | 2015-07-22 | 2018-06-29 | 株洲南车时代电气股份有限公司 | A kind of locomotive frequency signal inputs Acquisition Circuit |
| CN106546762A (en) * | 2016-11-02 | 2017-03-29 | 北京机械设备研究所 | A kind of measurement of rotating speed circuit method of work in asynchronous generator power-generating control system |
| CN106546762B (en) * | 2016-11-02 | 2019-05-10 | 北京机械设备研究所 | A kind of measurement of rotating speed circuit working method in asynchronous generator power-generating control system |
| CN107328951A (en) * | 2017-08-21 | 2017-11-07 | 安徽中家智康科技有限公司 | It is a kind of that the method for reducing frequency-changeable compressor tachometric survey error is realized by dividing measurement |
| CN107328951B (en) * | 2017-08-21 | 2020-01-17 | 安徽中家智康科技有限公司 | Method for reducing measurement error of rotating speed of variable frequency compressor through frequency division measurement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 Termination date: 20130707 |