CN203732558U - Three-phase asynchronous motor speed measuring circuit - Google Patents
Three-phase asynchronous motor speed measuring circuit Download PDFInfo
- Publication number
- CN203732558U CN203732558U CN201420090613.4U CN201420090613U CN203732558U CN 203732558 U CN203732558 U CN 203732558U CN 201420090613 U CN201420090613 U CN 201420090613U CN 203732558 U CN203732558 U CN 203732558U
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- operational amplifier
- voltage
- frequency converter
- circuit
- photoelectric sensor
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Abstract
The utility model relates to a three-phase asynchronous motor speed measuring circuit, which comprises a first operational amplifier, a second operational amplifier, a voltage frequency converter, a light sensing sheet and a photoelectric sensor, wherein the photoelectric sensor is fixed near a rotating shaft of a rotor of a three-phase asynchronous motor, the light sensing sheet is fixedly arranged on the rotating shaft of the rotor of the three-phase asynchronous motor, and pulse electric signals are outputted according to the number of rotating turns of the motor; the first operational amplifier is connected to the photoelectric sensor and amplifies the pulse electric signals; the voltage frequency converter is connected to the first operational amplifier, receives the amplified pulse electric signals and outputs a voltage signal; and the second operation amplifier is connected to the voltage frequency converter, receives the voltage signal and outputs a final amplification signal. The three-phase asynchronous motor speed measuring circuit is simple in structure, low in cost, stable in operation, applicable to teaching, capable of converting optical signals into electric signals and stable in test effect, and avoids interferences of the electric signals.
Description
Technical field
The utility model relates to a kind of tachometer circuit, relates in particular to a kind of threephase asynchronous tachometer circuit.
Background technology
At a lot of universities and colleges electric machines laboratory, need to measure the rotating speed of threephase asynchronous and some other technical parameter of motor simultaneously.At present Rotational Speed of Asynchronous Motor measuring method mainly contains contact tachometer and traditional non-contact type velocity gauge, and the former needs speed sensor to be arranged in rotating shaft just to measure, and uses inconveniently, and limitation is very large; Have photoelectric encoder and an electromagnetic velocity meter and the latter commonly uses, these two kinds of method costs are higher and be not suitable as measurement instrument.The favourable method method complexity especially such as rotating speed of measuring by motor case vibration frequency in addition, reliability is not high.Also has a kind of magnetic leakage AC induction motor knotmeter, use 8031 single-chip microcomputers for core, all more complicated of hardware configuration and Software for Design, cost is also higher, be not suitable for school laboratory and detect the use of threephase asynchronous rotating speed, therefore need badly and develop a kind of be applicable to teaching, simple in structure, lower-cost threephase asynchronous tachometer circuit.
Utility model content
The purpose of this utility model is to provide a kind of threephase asynchronous tachometer circuit, so that circuit structure is simple, cost is lower, and stable.
To achieve these goals, the utility model provides a kind of threephase asynchronous tachometer circuit, comprises the first operational amplifier, the second operational amplifier, voltage to frequency converter, sensitive film and photoelectric sensor, wherein:
Described photoelectric sensor is fixed near a three-phase asynchronous motor rotor rotating shaft, and described sensitive film is fixedly installed in described three-phase asynchronous motor rotor rotating shaft, according to described motor revolution output pulse electrical signal;
Described the first operational amplifier, connects described photoelectric sensor, and described pulse signal is amplified;
Described voltage to frequency converter, connects described the first operational amplifier, receives the described pulse electrical signal amplifying, and exports a voltage signal;
Described the second operational amplifier, connects described voltage to frequency converter, receives described voltage signal, and exports a final amplifying signal.
Preferably, described voltage to frequency converter comprises a LM331 chip, a differentiating circuit, a low-pass filter and a timing circuit; Described differentiating circuit connects the input comparator inverting input in described LM331 chip, the R/C interface of described LM331 chip connects described timing circuit, the electric current output interface of described LM331 chip connects described low-pass filter, and described low-pass filter output interface connects described voltage signal.
Preferably, described the first operational amplifier and described the second operational amplifier adopt a LM358 chip.
The utility model, owing to adopting above technical scheme, compared with technical scheme before, has following advantage and good effect:
1) the utility model provides a kind of threephase asynchronous tachometer circuit is simple in structure, cost is lower, and stable, is applicable to teaching and uses;
2) a kind of threephase asynchronous tachometer circuit that the utility model provides, adopts photoelectric sensor, and light signal is converted into electric signal, and test effect stability, has avoided the interference of electric signal.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of threephase asynchronous tachometer circuit in the utility model embodiment.
Embodiment
Further illustrate the utility model with specific embodiment with reference to the accompanying drawings.
As shown in Figure 1, a kind of threephase asynchronous tachometer circuit that the utility model provides, comprise the first operational amplifier 1, the second operational amplifier 2, voltage to frequency converter 3, sensitive film and photoelectric sensor 4, wherein the first operational amplifier 1 and the second operational amplifier 2 adopt a LM358 integrated chip, and outside connects the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 and the tenth resistance R 10.
Photoelectric sensor is fixed near a three-phase asynchronous motor rotor rotating shaft, in rotating shaft, be provided with a sensitive film, the every rotation of rotating shaft one week, the light that light source on photoelectric sensor sends can reflect to photoelectric sensor 4 by sensitive film, now photoelectric sensor is just exported a pulse electrical signal, and photoelectric sensor is by comprising that the testing circuit being made up of light emitting diode D3, D1, D2 forms.Adopt photoelectric sensor, light signal is converted into electric signal, test effect stability, has avoided the interference of electric signal.
The first operational amplifier 1, connects photoelectric sensor 4, and pulse signal F is amplified.
Voltage to frequency converter 4, connects the first operational amplifier 1, receives the pulse electrical signal f amplifying, and exports a voltage signal V.
LM331 chip is for being made up of parts such as input comparator, timing comparator, R-S trigger, output driving tube, return-to-zero transistor, bandgap circuit, precision current source circuit, current switch, output protection pipes.
Circuit as shown in Figure 1, realized by LM331 chip and peripheral circuit by voltage to frequency converter.Peripheral circuit comprises a differentiating circuit, a low-pass filter and a timing circuit; Timing circuit is made up of the 4th resistance R 4 and the second capacitor C 2; The 3rd capacitor C 3 and the 5th resistance R 5 form low-pass filter, and the first resistance R 1 and the first capacitor C 1 form differentiating circuit, and for fear of in the time that electromotor velocity is very low, corresponding pulses low width is too large, the impact that may cause the normal work of circuit.
The input comparator in-phase input end that the inverting input of the input comparator in LM331 chip connects in differentiating circuit, LM331 chip connects DC voltage, the R/C interface of LM331 chip connects timing circuit, the electric current output interface 7 of LM331 chip connects low-pass filter, low-pass filter output interface output voltage signal V.
The second operational amplifier 2, connects voltage to frequency converter 3, receiver voltage signal V, and export a final amplifying signal Vout.
In the specific works process of voltage to frequency converter inside be wherein:
The differentiating circuit that input pulse electric signal f forms through the first resistance R 1 and the first capacitor C 1 is added to the inverting input of input comparator, the in-phase input end of input comparator is through resistance R 2, the 3rd resistance R 3 dividing potential drops and add DC voltage, and inverting input is added with the DC voltage of Vcc through resistance R 1.In the time that the negative edge of input pulse arrives, producing a negative spike pulse through differentiating circuit the first resistance R 1, the first capacitor C 1 is added on the Vcc of inverting input of input comparator, in the time that negative sense spike pulse is greater than certain value, input comparator output high level makes rest-set flip-flop set, now current source charges to the 3rd capacitor C 3, because the cut-off of return-to-zero transistor makes power Vcc pass through the 4th resistance R 4, the second capacitor C 2 is charged simultaneously.In the time that the 3rd capacitor C 3 both end voltage reach certain value, timing comparator output high level resets rest-set flip-flop, and now the 3rd capacitor C 3 is discharged by the 5th resistance R 5, simultaneously, return-to-zero transistor turns, the second capacitor C 2 is discharged rapidly, completes charge and discharge process one time.After this,, in the time that the pulse negative edge of input electric impulse signal f arrives, circuit repeats the above-mentioned course of work.The duration of charging of the 3rd capacitor C 3 is determined by timing circuit the 4th resistance R 4, the second capacitor C 2, and the frequency of input pulse is higher, and in capacitor C 3, the electric charge of accumulation is just more, and output voltage is just higher, has realized the conversion of frequency and voltage.
Above-mentioned disclosed be only specific embodiment of the utility model, this embodiment is only that clearer explanation the utility model is used, and not to restriction of the present utility model, the changes that any person skilled in the art can think of, all should drop in protection domain.
Claims (3)
1. a threephase asynchronous tachometer circuit, is characterized in that, comprises the first operational amplifier, the second operational amplifier, voltage to frequency converter, sensitive film and photoelectric sensor, wherein:
Described photoelectric sensor is fixed near a three-phase asynchronous motor rotor rotating shaft, and described sensitive film is fixedly installed in described three-phase asynchronous motor rotor rotating shaft, according to described motor revolution output pulse electrical signal;
Described the first operational amplifier, connects described photoelectric sensor, and described pulse signal is amplified;
Described voltage to frequency converter, connects described the first operational amplifier, receives the described pulse electrical signal amplifying, and exports a voltage signal;
Described the second operational amplifier, connects described voltage to frequency converter, receives described voltage signal, and exports a final amplifying signal.
2. a kind of threephase asynchronous tachometer circuit as claimed in claim 1, is characterized in that, described voltage to frequency converter comprises a LM331 chip, a differentiating circuit, a low-pass filter and a timing circuit; Described differentiating circuit connects the input comparator inverting input in described LM331 chip, the R/C interface of described LM331 chip connects described timing circuit, the electric current output interface of described LM331 chip connects described low-pass filter, and described low-pass filter output interface connects described voltage signal.
3. a kind of threephase asynchronous tachometer circuit as claimed in claim 1, is characterized in that, described the first operational amplifier and described the second operational amplifier adopt a LM358 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090613.4U CN203732558U (en) | 2014-02-28 | 2014-02-28 | Three-phase asynchronous motor speed measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090613.4U CN203732558U (en) | 2014-02-28 | 2014-02-28 | Three-phase asynchronous motor speed measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203732558U true CN203732558U (en) | 2014-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420090613.4U Expired - Fee Related CN203732558U (en) | 2014-02-28 | 2014-02-28 | Three-phase asynchronous motor speed measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203732558U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861598A (en) * | 2017-11-30 | 2019-06-07 | 大陆汽车电子(芜湖)有限公司 | System and method for detecting the revolving speed of brushed DC motor |
| CN110376397A (en) * | 2019-08-15 | 2019-10-25 | 杭州电子科技大学 | The quick tachometer circuit of single-phase asynchronous AC tachometer generator high-precision |
-
2014
- 2014-02-28 CN CN201420090613.4U patent/CN203732558U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861598A (en) * | 2017-11-30 | 2019-06-07 | 大陆汽车电子(芜湖)有限公司 | System and method for detecting the revolving speed of brushed DC motor |
| CN109861598B (en) * | 2017-11-30 | 2020-12-04 | 纬湃汽车电子(芜湖)有限公司 | System and method for detecting rotation speed of brushed direct current motor |
| CN110376397A (en) * | 2019-08-15 | 2019-10-25 | 杭州电子科技大学 | The quick tachometer circuit of single-phase asynchronous AC tachometer generator high-precision |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20150228 |
|
| EXPY | Termination of patent right or utility model |