CN2766243Y - Digital velocimeter composed by tachometer generator with dual functions - Google Patents
Digital velocimeter composed by tachometer generator with dual functions Download PDFInfo
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- CN2766243Y CN2766243Y CN 200420022682 CN200420022682U CN2766243Y CN 2766243 Y CN2766243 Y CN 2766243Y CN 200420022682 CN200420022682 CN 200420022682 CN 200420022682 U CN200420022682 U CN 200420022682U CN 2766243 Y CN2766243 Y CN 2766243Y
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Abstract
The utility model relates to a digital speed measuring instrument composed of a speed measuring generator with dual function. A small-power permanent-magnet synchronous generator in the utility model is driven by a measured machine to synchronously rotate, and the generator adopts a stator iron magnetic saturation control circuit to control the amplitude value of the output alternating voltage thereof; the output terminal of the generator is simultaneously connected with a rotation speed pulse output coupling and shaping circuit, and a power supply rectifying and voltage stabilizing circuit to simultaneously provide requisite rotation speed signals and an operating power supply for the normal operation of a digital testing circuit. Thereby, the digital speed measuring instrument with compact structure and without external supply of power is formed.
Description
Affiliated technical field
The utility model relates to a kind of device of measurement mechanical velocity of rotation, and especially being fit to no externally fed needs the occasion of precision measurement to use again.
Background technology
Present known tech-generator can be divided into voltage output and pulse is exported two kinds according to the type of its signal output.Voltage output type tech-generator is that the mechanical separator speed that will import is transformed into direct current or ac voltage signal, and the amplitude of this voltage signal is directly proportional with tested rotating speed.Determine the value of the mechanical separator speed of input according to the voltage magnitude size of its output.Its advantage is can directly promote electromagnetic type pointer instrument to show rotating speed.But the linear error of this type of tech-generator, temperature coefficient are all bigger, and measurement range is less, should not do precision measurement and use, and also are difficult for being connected with digital device such as computing machine.
Pulse output type tech-generator with pulsed frequency as output signal.The frequency of pulse signal is directly proportional with rotating speed, and promptly it rotates a circle and can export one or several pulses, and it is less demanding to amplitude of output voltage.This type of tech-generator has the advantage that measuring accuracy height, test specification greatly, are not subjected to influence of temperature change, but the pulse signal of output must could correctly be measured the value of the mechanical separator speed of input after signal processing circuit.And the work of signal processing circuit must provide working power by the outside.This has just limited the use occasion of this type of equipment that tests the speed.
More than two big class tech-generators be the signal element of measuring rotating speed, the simple function of tach signal only is provided.
Summary of the invention
For improving measuring accuracy and measurement range, when adopting the pulsed tech-generator, must solve signal processing circuit is supplied with working power by the outside problem.
The utility model provides a kind of digital tachometer that is made of the tech-generator with power supply capacity, the tech-generator that adopts is not only the tach signal element, also provide simultaneously the parts of signal processing circuit working power, needn't be by outside supply power, thus expand and made things convenient for the use of Digital Speed Testing instrument greatly.
The technical scheme that its technical matters that solves the utility model adopts is:
Adopt a kind of miniwatt permanent magnet AC synchronous generator as tach signal and working power production part.During this generator work, take into account the frequency and the output power of output voltage, the dual-use function that tach signal and supply power are provided is promptly arranged.
The frequency of the voltage of generator speed and output has following definite relation:
Wherein, n: rotating speed (rev/min) f: supply frequency (hertz)
P: motor number of pole-pairs
When number of pole-pairs was 60, rotating speed equated with frequency, n=f.
When same rotating speed, number of pole-pairs is many more, and the alternating voltage frequency of generation is high more, and promptly the resolution of signal is also just high more.
Because power required during signal processing circuit work is less, generally only is several watts, so the output power of common miniwatt permanent magnet AC synchronous generator can both satisfy its demand.But the technical matters that solves is that the alternating current fluctuation of output is too big, output voltage is too low when the slow-speed of revolution, do not reach the requirement of signal processing circuit work, and output voltage is very high when high rotating speed, usually can reach the several times of signal processing circuit operating voltage or tens times, bring very big difficulty to stable power-supplying.
The technical scheme that the utility model is taked is: strengthen the number of turn of stator coil, reduce the sectional area of stator core, and adopt stator core magnetic saturation mu balanced circuit.
The voltage amplitude of permanent-magnet synchronous AC generator output is directly proportional with the stator coil number of turn and rotor speed.After the stator coil number of turn increases, when slowly running, motor just can export higher voltage, reach the required magnitude of voltage of signal processing circuit work.When the increase of synchronous alternating-current generator rotating speed, when the alternating voltage of output was elevated to certain value, the mu balanced circuit of stator core magnetic saturation was at this moment started working, and made and flow through bigger electric current in the stator coil.Because the stator core sectional area is less, so iron core is saturated rapidly under the bigger function of current, make the alternating voltage of output keep stable, no longer the increase with generator speed increases.
Stator core magnetic saturation voltage stabilizing circuit is to be inverted the voltage stabilizing diode that is connected by current-limiting resistance and two polarity to be in series, and this circuit is connected in parallel on two output terminals of stator coil.When alternating voltage reached certain value, voltage stabilizing diode was breakdown, and the electric current that at this moment flows through stator coil increases, and caused increasing until saturated by the magnetic flux of stator core, and the alternating voltage of output is no longer raise, and reached the purpose of voltage stabilizing.
The alternating voltage of process magnetic saturation voltage stabilizing is again through just becoming the working power of signal processing circuit after the rectifying and wave-filtering voltage stabilizing.Rotational speed pulse signal can be obtained by two kinds of methods.One is obtained from the alternating current of synchronous generator output by coupling transformer; It two is to increase a signal coil in synchronous generator except that potential winding in addition, and supply voltage is produced by different coils respectively with signal voltage.
Signal processing circuit obtains rotational speed pulse signal and working power simultaneously, thereby can make things convenient for the value of measuring the input mechanical separator speed accurately.
The permanent magnet AC synchronous generator can adopt any version, as common rotor formula, Lundell or the like.As everyone knows, various permanent magnet motors also can be used as generator and use.Therefore various forms of permasyn morots, permanent magnetic step motor also can be used as magneto alternator of the present utility model, just will cooperate the work of magnetic saturation mu balanced circuit when design, reduce the sectional area of stator core.Simultaneously, suitably design the line footpath and the number of turn of stator coil.
The beneficial effects of the utility model are: after use has the tech-generator of dual-use function, when obtaining tach signal, the working power of picked up signal treatment circuit makes the simpler compactness of digital tachometer table, thereby has enlarged the use occasion of digital tachometer table greatly.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the circuit theory diagrams with tech-generator of dual-use function of the present utility model
Fig. 2 is the embodiment circuit block diagram
Fig. 3 is the embodiment outside drawing
Embodiment:
Stator coil L output AC voltage～V of permanent magnet AC synchronous generator F in Fig. 1 is through D
5-D
8Become DC voltage behind the bridge rectifier circuit of forming, pass through the filtering capacitor C again
1, C
2And circuit of three-terminal voltage-stabilizing integrated IC
2, become stable dc supply.Simultaneously～and V process signal coupling transformer T, be input to amplifier IC
1, after amplifying shaping, become rotational speed pulse signal, be transported to signal processing circuit.D wherein
1, D
2, be IC
1Output terminal protection diode, R
4Be input pickup resistance.If in magneto alternator, increase by one group of signal coil, can omit signal coupling transformer T so.R
2, R
3For voltage bias resistance, at IC
1End of oppisite phase add certain threshold voltage, with the elimination undesired signal.
The output terminal parallel connection of L by R
1, D
3, D
4The magnetic saturation AC voltage-stabilizing circuit that is connected into.When the peak value of～V surpasses D
3, D
4During voltage of voltage regulation value after the series connection, D
3, D
4Breakdown, the electric current that flows through L increases, and the magnetic flux by electricity generator stator core is increased, and until saturated, reaches～purpose that V is stable.R wherein
1Be current-limiting resistance, play protection D
3, D
4And the effect of L.
Fig. 2 is the block scheme of embodiment circuit.Except that permanent magnet AC synchronous generator, magnetic saturation AC voltage-stabilizing circuit, rectifying and voltage-stabilizing filtering circuit, pulse coupling shaping circuit, also have signal processing circuit and digital display circuit.Signal processing circuit by time-base signal circuit, counting circuit, latch decoder driver circuit and form.
Above circuit constitutes complete measuring digital rotating speed circuit.
Fig. 3 is the outside drawing of embodiment.Permanent magnet AC synchronous generator rotor axle 1 stretches out housing 2 outsides, by the measured object driven rotary, imports tested mechanical separator speed.Housing 2 is fixed together with dial plate 3, back plate 5.Digital display board 4 is fixed on dial plate 3 central authorities.The inside of housing 2 is equipped with permanent magnet AC synchronous generator and all electric components except that digital display circuit.
The permanent magnet AC synchronous generator sends alternating current under the drive of tested mechanical rotation, handle the numerical signal that tested mechanical separator speed is exported in the back by the electric wiring that is installed in the same housing again, is transported to the digital display board 4 that is installed on the dial plate 3 and shows.Back plate 5 is used for the usefulness of instrument installation.Support 6 is the connecting piece of back plate 5 and dial plate 3.
Claims (3)
1, a kind of digital tachometer with tech-generator composition of dual-use function, form by tech-generator and digital test circuit, it is characterized in that: tech-generator adopts magneto alternator, the generator voltage output terminal is connected to tacho-pulse output coupled circuit and power supply rectifier and voltage regulator circuit, output speed pulse signal and working power respectively simultaneously.
2, the digital rotational speed meters of forming according to the described tech-generator with dual-use function of claim 1, it is characterized in that: the stator coil of magneto alternator is connected to the stator core magnetic saturation AC voltage-stabilizing circuit that is formed by connecting by current-limiting resistance, voltage stabilizing diode.
3, the digital rotational speed meters of forming according to the described tech-generator with dual-use function of claim 1 is characterized in that: tech-generator is installed in the same instrument housing with all electronic circuit, forms the digital tachometer of an independent completion, compactness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420022682 CN2766243Y (en) | 2004-05-13 | 2004-05-13 | Digital velocimeter composed by tachometer generator with dual functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420022682 CN2766243Y (en) | 2004-05-13 | 2004-05-13 | Digital velocimeter composed by tachometer generator with dual functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2766243Y true CN2766243Y (en) | 2006-03-22 |
Family
ID=36606905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420022682 Expired - Fee Related CN2766243Y (en) | 2004-05-13 | 2004-05-13 | Digital velocimeter composed by tachometer generator with dual functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2766243Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107031503A (en) * | 2017-06-06 | 2017-08-11 | 深圳市宇辰智能科技有限公司 | A kind of mobile warning sign |
| CN108312960A (en) * | 2017-06-06 | 2018-07-24 | 深圳市宇辰智能科技有限公司 | A kind of mobile warning sign |
-
2004
- 2004-05-13 CN CN 200420022682 patent/CN2766243Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107031503A (en) * | 2017-06-06 | 2017-08-11 | 深圳市宇辰智能科技有限公司 | A kind of mobile warning sign |
| CN108312960A (en) * | 2017-06-06 | 2018-07-24 | 深圳市宇辰智能科技有限公司 | A kind of mobile warning sign |
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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: 20060322 |