CN2063644U - Intelligence slip and revolution meter - Google Patents
Intelligence slip and revolution meter Download PDFInfo
- Publication number
- CN2063644U CN2063644U CN 89220037 CN89220037U CN2063644U CN 2063644 U CN2063644 U CN 2063644U CN 89220037 CN89220037 CN 89220037 CN 89220037 U CN89220037 U CN 89220037U CN 2063644 U CN2063644 U CN 2063644U
- Authority
- CN
- China
- Prior art keywords
- chip microcomputer
- measure
- shaping
- cycle
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
The utility model discloses an intelligent meter used for measuring the slip ratio and the revolution speed of asynchronous motors. The intelligent meter adopts SCM, software and hardware technologies, uses induction coil method or speed measurement method and takes technical measures such as frequency selection filtering, limiting amplification, shaping, isolating, etc. as well as software/hardware anti-jamming measures such as switching power supply, digital filtering, etc. The measuring result is displayed by numbers and can be output to connect with machines. The utility model has the advantages of direct measurement of slip ratio and revolution speed, high precision of measurement, stable and reliable performance, high anti-interference ability, etc., and is applicable to all the motors adopting induction coil method or speed measurement method to measure the slip ratio. The utility model displays a more prominent superiority to submersible pumps or motors which only use induction coil method to measure the slip ratio.
Description
The utility model relates to electronic instrument, particularly measures the intelligent instrument of asynchronous motor revolutional slip.
An important physical amount when revolutional slip is the asynchronous motor operation.Inductive coil method and velocimetry are to measure revolutional slip two kinds of methods commonly used.In some cases, as the revolutional slip of test submersible motor and submersible pump, then can only adopt the inductive coil method to measure.Its sensor of inductive coil method examine signal contain the stator and rotor sensor current signal, but useful rotor inductive currents signal is very faint, much smaller than 50 all stator-induced electromagnetic stream signals, the scheme that extensively adopts is at present:
One, galvanometer method: utilize the magneto-electric galvanometer not react the characteristics of the above alternating potential of 10 He Zhi, pointer or luminous point are swung by rotor frequency, manually calculate beat of pointer times N, measure N required time T of swing with stopwatch simultaneously, according to formula f
N=N/T calculates rotor frequency f
NCalculate revolutional slip S according to formula (1) again.
S＝f
N／f
O·（％）………………（1）
In the formula: f
OBe mains frequency
Its two, survey all methods: measure rotor cycle TN with frequency meter, calculate revolutional slip S by (2) formula again.
S＝T
O／T
N（％）………………（2）
In the formula: T
OBe the electrical network cycle.
It is to utilize tachogenerator and frequency meter or knotmeter to measure rotating speed that velocimetry is surveyed revolutional slip, calculates revolutional slip by (3) formula again.
S＝（N
O－N）／N
O（％）……………………（3）
In the formula: N
OSynchronous rotational speed for asynchronous machine
N is the rotating speed of asynchronous motor
The measurement of revolutional slip at present exists following problems:
1. can not directly show revolutional slip S.The inductive coil method can't directly show rotation speed n, but will just can draw through calculating.
2. the revolutional slip measuring accuracy is low.By (2), (3) formula as can be known, revolutional slip is relevant with electrical network cycle or synchronous rotational speed, and the random fluctuation within the specific limits of electrical network cycle, and suppose all in the prior art that mains frequency is that 50 all substitutions are calculated, thus error introduced.
In the galvanometer scheme of inductive coil method, because amplitude of fluctuation is relevant with the signal power,, will be difficult to differentiate in case frequency is higher, therefore import personal error.Often increase number of oscillations N in order to reduce error, prolonged Measuring Time so again.
3. the galvanometer scheme instantaneous revolutional slip of energy measurement not.
4. the company's of being not easy to machine is tested automatically.
5. velocimetry is unsuitable for measuring under water.
The purpose of this utility model: design a kind of inductive coil method or velocimetry of utilizing, can transient measurement, directly show asynchronous motor revolutional slip, rotating speed; Measure mains frequency, cycle simultaneously, synchronous rotational speed, the high-precision meter in rotor inductive currents frequency and cycle.
For achieving the above object, the technical scheme that the utility model is taked is:
Use single-chip microcomputer, adopt interrupt mode, measure electrical network and rotor inductive currents cycle in real time.
Utilize microcomputer at a high speed, the high-accuracy arithmetic function, calculate in real time and show revolutional slip, rotating speed, realize measuring in real time.
Survey Zhou Shizhong and select the 6MHZ crystal oscillator for use.
It is relevant with power of motor, structural manufacturing process and sensor installation site that inductive coil is obtained the power of signal, in order to guarantee that instrument adapts to various occasions and uses, partly adopt frequency-selective filtering in simulation, amplitude limit amplifies, and improves noise margin and technical measures such as smit circuit shaping, isolation.
Adopt software and hardware interference protection measures such as photoelectricity isolation, Switching Power Supply, digital filtering, make instrument have the on-the-spot reliably working of strong interferers.
Adopt the parallel interface chip that test result is exported, be convenient to connect machine, realize measuring automatically.
The utlity model has following advantage:
1. employing single chip microcomputer, with the data that measure in real time after computing, the directly digital revolutional slip that shows.
2. single-chip microcomputer is selected the 6MHz crystal oscillator for use, and good stability is surveyed the Zhou Jingdu height, has overcome various personal errors, makes whole instrument good stability, the precision height.
3. adopt software and hardware interference protection measures such as switching type power supply and photoelectricity isolation, be applicable to steady operation under the occasion of strong interferers.
4. measure the object of revolutional slip for being suitable for the inductive coil method, as: submersible motor, submersible pump etc. provide direct reading instrument.
Be described further below in conjunction with embodiment:
Fig. 1 is the intelligent slip tachometer of measuring schematic diagram of adapted inductive coil sensor.
1-inductive coil sensor; The 2-frequency-selecting filter;
The 3-limiting amplifier; 4-Si Mite shaping circuit;
5-photoelectricity is isolated; 6-mains frequency sensor;
7-shaping circuit (with 4); 8-photoelectricity is isolated (with 5);
The 9-one-chip computer; The 10-parallel interface.
Place the inductive coil sensor (1) of tested motor housing or end, examine to such an extent that the rotor sensor current signal takes out the rotor signal through wave filter (2), amplitude limit send single-chip microcomputer (9) interrupting input end 1NT after amplifying (3) shaping (4) and photoelectricity isolation (5)
OSensor (6) examine power network signal after (8) are isolated in shaping (7), send single-chip microcomputer (9) interrupting input end 1NT1, f
OBehind four frequency divisions as the self-correcting signal.
Single-chip microcomputer is measured f under software control
NSignal N
1In the cycle of individual cycle, measure f simultaneously
OSignal N
2The cycle of individual cycle.Calculate rotating speed, frequency and slip with the multibyte floating-point arithmetic routine, get number of pole-pairs and calculate synchronous rotational speed.Measurement result is kept in the internal memory, and the result can be specified by button at random and show.The result also can export through 8155 parallel interfaces at random.
Fig. 2 is the intelligent slip tachometer of measuring schematic diagram of joining tachogenerator.
Among the figure: 11 is tachogenerator.
The pulse signal of photoelectricity or magnetoelectricity tachogenerator (11) output send singlechip interruption input end 1NT after amplifying (3) shaping (4) and isolating (5).
Mains frequency send middle-end input end 1NT1 through sensor (6) shaping (7) with after isolating.To f
OFour frequency divisions are as the self-correcting signal.
Single-chip microcomputer is measured f signal N simultaneously under software control
3Individual cycle and f
OSignal N
2The cycle of individual cycle.Calculate slip, frequency, cycle and rotating speed through multibyte floating-point binary operation, get number of pole-pairs and calculate synchronous rotational speed.
The result can be specified by button at random and show.
The result also can export through 8155 parallel interfaces.
Claims (5)
1, a kind of intelligence instrument of measuring the asynchronous motor revolutional slip is characterized in that:
A, application single chip microcomputer adopt inductive coil sensor (1) output signal f ' N, and through frequency-selective filtering (2), amplitude limit amplifies (3), after smit circuit (4) shaping, delivers to single-chip microcomputer (9) interrupting input end 1NT
0
B, electric network source detect signal f ' o through sensor (6), send another interrupting input end of single-chip microcomputer (9) 1NT after smit circuit (7) shaping
1
C, single-chip microcomputer adopt interrupt mode, measure the N of rotor current signal fN simultaneously
1The N of individual cycle and power network current signal fo
2The period T N of individual cycle and To, after the multibyte floating-point operation, the directly digital revolutional slip that shows.
2, a kind of intelligence instrument of measuring the asynchronous motor revolutional slip is characterized in that:
A, application single chip microcomputer, the tach signal f ' that adopts magneto-electric or photoelectric measure speeding sensor (11) to export amplifies (3) through amplitude limit, after smit circuit (4) shaping, send single-chip microcomputer (9) interrupting input end 1NT
O
B, electric network source detect signal f through sensor (6)
O', after smit circuit (7) shaping, send another interrupting input end of single-chip microcomputer 1NT
1
C, single-chip microcomputer adopt interrupt mode, measure the N of tach signal f simultaneously
3The cycle of individual cycle and mains frequency f
ON
2The cycle of individual cycle, after the multibyte floating-point operation, the directly digital revolutional slip that shows.
3, intelligence instrument as claimed in claim 1 or 2 is characterized in that: instrument adopts switching regulator D.C. regulated power supply and photoelectric isolating circuit.
4, intelligence instrument as claimed in claim 1 or 2 is characterized in that: measurement data can connect machine through parallel interface (10) output.
5, intelligence instrument as claimed in claim 1 or 2 is characterized in that: measurement data is carried out the denary number floating-point with four light-emitting nixie tubes and is shown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89220037 CN2063644U (en) | 1989-11-15 | 1989-11-15 | Intelligence slip and revolution meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89220037 CN2063644U (en) | 1989-11-15 | 1989-11-15 | Intelligence slip and revolution meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2063644U true CN2063644U (en) | 1990-10-10 |
Family
ID=4874792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89220037 Expired - Lifetime CN2063644U (en) | 1989-11-15 | 1989-11-15 | Intelligence slip and revolution meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2063644U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329735C (en) * | 2003-09-02 | 2007-08-01 | 成都希望电子研究所 | Apparatus for testing rotating speed of asynchronous motor |
| CN106771316A (en) * | 2016-12-26 | 2017-05-31 | 渤海造船厂集团有限公司 | The rotating speed and rate measuring method of motor |
-
1989
- 1989-11-15 CN CN 89220037 patent/CN2063644U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1329735C (en) * | 2003-09-02 | 2007-08-01 | 成都希望电子研究所 | Apparatus for testing rotating speed of asynchronous motor |
| CN106771316A (en) * | 2016-12-26 | 2017-05-31 | 渤海造船厂集团有限公司 | The rotating speed and rate measuring method of motor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102914665B (en) | Motor revolving speed measurement and fault state detection system | |
| CN101408553B (en) | Rotary peed-measuring and frequency outputting device | |
| CN103630702A (en) | Electrical-isolation accurate digital type measuring interface circuit for alternating current speed measuring motor | |
| CN103368496A (en) | Frequency converter M/T velocity-measuring system and method based on DSP (Digital Signal Processor) | |
| CN103308706A (en) | Method and device for detecting rotating speed of vane pump | |
| CN208606651U (en) | A kind of digitlization tape measure | |
| CN2063644U (en) | Intelligence slip and revolution meter | |
| CN104949798B (en) | A kind of method of measurement motor rotary inertia | |
| CN200965471Y (en) | Winch rotary direction identification and rotary angle measurement device | |
| CN208847829U (en) | A kind of device and altimeter and slide calliper rule based on rotating excitation field displacement measurement | |
| CN2742445Y (en) | Self powered digital tachometer | |
| CN203551587U (en) | Electrical isolation quasi-digital measuring interface circuit used for AC speed-measuring motor | |
| CN202285021U (en) | Instrument for measuring wheel speed | |
| CN102183290B (en) | A kind of method improving time frequency conversion accuracy of shaft torsional vibration signals | |
| CN2766243Y (en) | Digital velocimeter composed by tachometer generator with dual functions | |
| CN205785503U (en) | A kind of rotating machinery vibrating measures system | |
| CN208506069U (en) | A kind of velocity-measuring system based on photoelectric sensor | |
| CN200976038Y (en) | Extruding press synthetic measuring instrument | |
| CN2260330Y (en) | Intelligence type rotational speed measuring device | |
| CN1410745A (en) | Integrated vibration signal complete period equal phase high speed synchronous data collection system | |
| CN202004719U (en) | Direct torque control system based on DSP (Digital Signal Processor) speed-free sensor | |
| CN220137163U (en) | Rotating speed measuring instrument of totally-enclosed variable frequency motor | |
| CN110646633B (en) | Speed detection system and speed detection method for alternating current winding motor | |
| CN203148965U (en) | Motor rotating speed measuring system | |
| CN2135141Y (en) | Meter for measuring velocity and volume of flow for water in pipe or canal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |