CN110426555A - A kind of motor harmonic measuring method - Google Patents
A kind of motor harmonic measuring method Download PDFInfo
- Publication number
- CN110426555A CN110426555A CN201910818146.XA CN201910818146A CN110426555A CN 110426555 A CN110426555 A CN 110426555A CN 201910818146 A CN201910818146 A CN 201910818146A CN 110426555 A CN110426555 A CN 110426555A
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- motor
- harmonic
- measured motor
- electromotive force
- measured
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/18—Spectrum analysis; Fourier analysis with provision for recording frequency spectrum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
Abstract
The present invention discloses a kind of motor harmonic measuring method, includes the following steps: that controlling servo motor drives to measured motor uniform rotation；It acquires the voltage data to induced electromotive force between the adjacent two-phase of measured motor in real time by external A/D card, is drawn to form induction electric power curve according to voltage data；The induced electromotive force period is obtained according to induction electric power curve, induced electromotive force frequency is obtained according to the induced electromotive force period, the theoretical rotational speed of motor to be measured is calculated according to induced electromotive force frequency, whether the revolving speed according to calculated theoretical rotational speed check test system is normal；Fft analysis is carried out to induction electric power curve, obtains harmonic spectrum, the harmonic wave and harmonic amplitude to measured motor can be obtained according to harmonic spectrum.Solve the problems, such as that existing dynamo dynamometer machine can not be measured and be analyzed to motor harmonic wave.
Description
Technical field
The present invention relates to motor harmonic measure, in particular to a kind of motor harmonic measuring method.
Background technique
Motor harmonic wave is the important performance indexes of motor, and motor harmonic wave, which crosses senior general, increases motor by loss, and motor is caused to imitate
Rate and power factor (PF) are deteriorated；Temperature is caused to increase；Interference is generated to power supply line.Dynamo dynamometer machine currently on the market can not be right
Motor harmonic wave carries out test analysis.
Summary of the invention
In view of defect of the existing technology, the technical problem to be solved by the invention is to provide a kind of motor harmonic waves
Measurement method, it is intended to solve the problems, such as that existing dynamo dynamometer machine can not carry out test analysis to motor harmonic wave.
To achieve the above object, the present invention provides a kind of motor harmonic measuring method, and described method includes following steps:
Step S1, control servo motor drives to measured motor uniform rotation；It is described to be connected to measured motor by first shaft coupling
It is connected to central axis, is connected with angular encoder on the central axis；
Step S2, pass through the external A/D card acquisition in real time voltage to induced electromotive force between the adjacent two-phase of measured motor
Data；It is drawn to form induction electric power curve E according to the voltage dataij(t)；Described i, j are the number of phases to measured motor
Number；
Step S3, according to the induction electric power curve Eij(t) induced electromotive force cycle T is obtained, according to the induction electric
Gesture cycle T can obtain induced electromotive force frequency f, describedIt can be calculated according to the induced electromotive force frequency f to measured motor
Theoretical rotational speed n, it is describedThe p is the number of pole-pairs to measured motor；According to the calculated theoretical rotational speed n
Whether the revolving speed n ' of check test system is normal；
Step S4, according to the induction electric power curve Eij(t)；To the induction electric power curve Eij(t) FFT is carried out
Analysis；Time-domain signal is converted into frequency-region signal；Harmonic spectrum is obtained, can be obtained according to the harmonic spectrum described to measured motor
Harmonic wave and harmonic amplitude.
In the technical scheme, by the way that the angular encoder is arranged, it is ensured that measuring mechanism completes one completely
Periodic sampling；By the induction electric power curve E for treating measured motorij(t) fft analysis is carried out, the harmonic spectrum is obtained, according to
The harmonic spectrum can obtain the harmonic wave to measured motor, and motor harmonic wave can not be measured by solving existing dynamo dynamometer machine
The problem of with analysis.
Furthermore, the servo motor and it is described between measured motor pass through pulley drive；The servo motor
Output shaft be connected with driving wheel；It is described that driven wheel is connected with by the central axis to measured motor.
In the technical scheme, by setting belt pulley for the servo motor and the transmission between measured motor
Transmission, can isolate the interference of the servo motor, guarantees the accuracy of measurement result.
Furthermore, the step S2 further include:
Acquire the pivoting angle data to measured motor in real time by the angular encoder.
In the technical scheme, by acquiring the pivoting angle data to measured motor in real time, it is ensured that measuring machine
Structure completes a complete periodic sampling.
Furthermore, the step S3 further include:
By the theoretical rotational speed n being calculated compared with the revolving speed n ' of the test macro, the test macro is judged
Revolving speed n ' it is whether normal；
If the revolving speed n ' of the test macro is abnormal, alarm is exported；
If the revolving speed n ' of the test macro is normal, continue following step S4.
In the technical scheme, by on-line checking, whether the revolving speed n ' for prejudging the test macro is normal, can be timely
Stopping measurement, avoid measurement result inaccurate.
Furthermore, the method also includes:
It is biggish humorous that the energy such as 3 order harmonics, 5 order harmonics, 7 order harmonics are extracted from the harmonic spectrum obtained through fft analysis
Wave amplitude, by the obtained harmonic amplitude compared with the boundary value of setting, whether judgement is described qualified to measured motor；
If it is described to measured motor be it is unqualified, export alarm；
If to measured motor it is qualification described, prints qualified label and be pasted on described on measured motor.
In the technical scheme, by on-line checking, whether anticipation in advance is described qualified to measured motor.
The beneficial effects of the present invention are: in the present invention, by the way that the angular encoder is arranged, it is ensured that measuring mechanism
Complete a complete periodic sampling；By the induction electric power curve E for treating measured motorij(t) fft analysis is carried out, institute is obtained
Harmonic spectrum is stated, the harmonic wave to measured motor can be obtained according to the harmonic spectrum, solving existing dynamo dynamometer machine can not be right
The problem of motor harmonic wave is measured and is analyzed.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of motor harmonic measuring method of the present invention；
Fig. 2 is a kind of structural schematic diagram of motor harmonic measure of the invention mechanism；
Fig. 3 is the induced electromotive force curve graph in the embodiment of the invention to measured motor；
Fig. 4 is harmonic spectrum figure in the embodiment of the invention；
Fig. 5 is harmonic amplitude datagram in the embodiment of the invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples:
As shown in Figure 1, being the flow diagram of the present embodiment, include the following steps:
Step S1, control servo motor 200 drives to measured motor uniform rotation；It is described to pass through first shaft coupling to measured motor
500 are connected with central axis 400, are connected with angular encoder 100 on the central axis 400；
Step S2, pass through the external A/D card acquisition in real time voltage to induced electromotive force between the adjacent two-phase of measured motor
Data；It is drawn to form induction electric power curve E according to the voltage dataij(t)；Described i, j are the number of phases to measured motor
Number；
Step S3, according to the induction electric power curve Eij(t) induced electromotive force cycle T is obtained, according to the induction electric
Gesture cycle T can obtain induced electromotive force frequency f, describedIt can be calculated according to the induced electromotive force frequency f to measured motor
Theoretical rotational speed n, it is describedThe p is the number of pole-pairs to measured motor；According to the calculated theoretical rotational speed n
Whether the revolving speed n ' of check test system is normal；
Step S4, according to the induction electric power curve Eij(t)；To the induction electric power curve Eij(t) FFT is carried out
Analysis；Time-domain signal is converted into frequency-region signal；Harmonic spectrum is obtained, can be obtained according to the harmonic spectrum described to measured motor
Harmonic wave and harmonic amplitude.
Below by embodiment, the present invention will be described:
The method is implemented in a kind of motor harmonic measure mechanism, and motor harmonic measure mechanism includes angular coding
Device 100, servo motor 200, bracket 300；Angular encoder bracket 301 and servo motor bracket are installed on the bracket 300
302；The angular encoder 100 is installed on the angular encoder bracket 301；The servo motor 200 is installed in described
On servo motor bracket 302；The intermediate position of the angular encoder bracket 301 offers first through hole；In the first through hole
It is installed on first bearing 303；Central axis 400 is also installed in the first through hole, it is logical that the central axis 400 passes through described first
Hole and the first bearing 303；The central axis 400 is connected with the first belt pulley 600 by second shaft coupling 800；It is described to watch
The output shaft for taking motor 200 is connected with the second belt pulley 700；Second belt pulley 700 is main pulley, first belt
Wheel 600 is slave pulley；First belt pulley 600 is connected with second belt pulley 700 by belt；The central axis
400 one end far from the second shaft coupling 800 are connected with by the first shaft coupling 500 to measured motor；The servo electricity
Machine 200 is indirectly driven described to be measured by first belt pulley 600, second belt pulley 700 and the central axis 400
Motor rotation；It is installed on the bracket 300 and clamps bracket 304 to measured motor, it is described to install to measured motor in the electricity to be measured
Machine clamps on bracket 304.
In the present embodiment, it is described to measured motor be threephase asynchronous machine.
In the present embodiment, a kind of motor harmonic measuring method is provided, is included the following steps:
Step S1, control servo motor 200 drives to measured motor uniform rotation；
It is noted that described be connected with central axis 400, the central axis by first shaft coupling 500 to measured motor
Angular encoder 100 is connected on 400；The servo motor 200 and it is described between measured motor pass through pulley drive；It is described
The output shaft of servo motor 200 is connected with driving wheel；It is described that driven wheel is connected with by the central axis 400 to measured motor.
Step S2, pass through the external A/D card acquisition in real time voltage to induced electromotive force between the adjacent two-phase of measured motor
Data；It is drawn to form induction electric power curve E according to the voltage dataij(t)；The induction electric power curve Eij(t) as schemed
Shown in 3.
Step S3, according to the induction electric power curve Eij(t) induced electromotive force cycle T is obtained, according to the induction electric
Gesture cycle T can obtain induced electromotive force frequency f, describedIt can be calculated according to the induced electromotive force frequency f to measured motor
Theoretical rotational speed n, it is describedThe p is the number of pole-pairs to measured motor；
Specifically, the step S3 further include:
By the theoretical rotational speed n being calculated compared with the revolving speed n ' of the test macro, the test macro is judged
Revolving speed n ' it is whether normal；
If the revolving speed n ' of the test macro is abnormal, alarm is exported；
If the revolving speed n ' of the test macro is normal, continue following step S4.
Step S4, according to the induction electric power curve Eij(t)；To the induction electric power curve Eij(t) FFT is carried out
Analysis；Time-domain signal is converted into frequency-region signal；Harmonic spectrum is obtained, the harmonic spectrum is as shown in Figure 4；
The harmonic wave and harmonic amplitude to measured motor can be obtained according to the harmonic spectrum；Rotor rotation turns around 360
Degree, the position of fundamental frequency should be identical as motor number of pole-pairs, and corresponding harmonic wave is answered are as follows: fundamental frequency * harmonic order；Such as: motor number of pole-pairs is 4
Pole, after induced electromotive force carries out FFT decomposition, fundamental frequency position should be at 4HZ, and corresponding 3 order harmonics should be at 4*3=12HZ, 5 ranks
Harmonic wave should be at 4*5=20HZ, and 7 order harmonics should be at 4*7=28HZ；The obtained harmonic amplitude is stored and recorded in
In table, as shown in Figure 5.
Specifically, the method also includes:
It is biggish humorous that the energy such as 3 order harmonics, 5 order harmonics, 7 order harmonics are extracted from the harmonic spectrum obtained through fft analysis
Wave amplitude, by the obtained harmonic amplitude compared with the boundary value of setting, whether judgement is described qualified to measured motor；
If it is described to measured motor be it is unqualified, export alarm；
If to measured motor it is qualification described, prints qualified label and be pasted on described on measured motor.
Specific embodiments of the present invention are described in detail above.It should be appreciated that specific embodiments of the present invention are not unique,
Those skilled in the art design according to the present invention can make many modifications and variations within the scope of the claims.
Therefore, all those of skill in the art pass through logic point on the basis of existing technology according to a particular embodiment of the invention
Analysis, reasoning or the limited available technical solution of experiment, all should be within the scope of protection determined by the claims.
Claims (5)
1. a kind of motor harmonic measuring method, which is characterized in that described method includes following steps:
Step S1, control servo motor drives to measured motor uniform rotation；It is described to be connected with to measured motor by first shaft coupling
Central axis is connected with angular encoder on the central axis；
Step S2, pass through the external A/D card acquisition in real time voltage data to induced electromotive force between the adjacent two-phase of measured motor；
It is drawn to form induction electric power curve E according to the voltage dataij(t)；Described i, j are that the number of phases to measured motor is numbered；
Step S3, according to the induction electric power curve Eij(t) induced electromotive force cycle T is obtained, according to the induced electromotive force week
Phase T can obtain induced electromotive force frequency f, describedThe reason to measured motor can be calculated according to the induced electromotive force frequency f
It is described by revolving speed nThe p is the number of pole-pairs to measured motor；It is verified according to the calculated theoretical rotational speed n
Whether the revolving speed n ' of test macro is normal；
Step S4, according to the induction electric power curve Eij(t)；To the induction electric power curve Eij(t) fft analysis is carried out；
Time-domain signal is converted into frequency-region signal；Harmonic spectrum is obtained, the harmonic wave to measured motor can be obtained according to the harmonic spectrum
And harmonic amplitude.
2. a kind of harmonic measuring method as described in claim 1, which is characterized in that the servo motor and described to measured motor
Between pass through pulley drive；The output shaft of the servo motor is connected with driving wheel；It is described to pass through the center to measured motor
Axis connection has driven wheel.
3. a kind of harmonic measuring method as described in claim 1, which is characterized in that the step S2 further include:
Acquire the pivoting angle data to measured motor in real time by the angular encoder.
4. a kind of harmonic measuring method as described in claim 1, which is characterized in that the step S3 further include:
By the theoretical rotational speed n being calculated compared with the revolving speed n ' of the test macro, turning for the test macro is judged
Whether fast n ' is normal；
If the revolving speed n ' of the test macro is abnormal, alarm is exported；
If the revolving speed n ' of the test macro is normal, continue following step S4.
5. a kind of harmonic measuring method as described in claim 1, which is characterized in that the method also includes:
The biggish harmonic wave width of the energy such as 3 order harmonics, 5 order harmonics, 7 order harmonics is extracted from the harmonic spectrum obtained through fft analysis
Value, by the obtained harmonic amplitude compared with the boundary value of setting, whether judgement is described qualified to measured motor；
If it is described to measured motor be it is unqualified, export alarm；
If to measured motor it is qualification described, prints qualified label and be pasted on described on measured motor.
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| CN201910818146.XA CN110426555A (en) | 2019-08-30 | 2019-08-30 | A kind of motor harmonic measuring method |
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| CN201910818146.XA CN110426555A (en) | 2019-08-30 | 2019-08-30 | A kind of motor harmonic measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366774A (en) * | 2020-03-19 | 2020-07-03 | 上海梓一测控技术有限公司 | Reverse electromotive force testing equipment and method for automobile EPS motor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030042857A (en) * | 2001-11-26 | 2003-06-02 | 백정복 | Method of Testing Fault of DC Motor and Device thereof |
| CN101262153A (en) * | 2008-04-21 | 2008-09-10 | 哈尔滨理工大学 | Cage inductive electromotor with detection loop and detection method for its rotor broken bar |
| CN101672894A (en) * | 2009-10-14 | 2010-03-17 | 华北电力大学（保定） | Motor rotor turn-to-turn short circuit diagnosis method based on high-order harmonic shaft voltage signals |
| CN201514468U (en) * | 2009-11-10 | 2010-06-23 | 哈尔滨理工大学 | Cage type induction motor rotor strip breaking failure detecting device and motor with the device |
| CN102072779A (en) * | 2010-11-17 | 2011-05-25 | 哈尔滨工业大学 | Rotor-groove harmonic analysis based method for identifying temperature of sensorless rotor for submersible motor |
| CN108802523A (en) * | 2018-05-31 | 2018-11-13 | 山西大学 | Wind power generator unit frequency converter is monitored on-line and trouble-shooter |
| CN108957322A (en) * | 2018-08-24 | 2018-12-07 | 佛山市顺德区金泰德胜电机有限公司 | The measurement method of magneto counter electromotive force and used measuring device |
-
2019
- 2019-08-30 CN CN201910818146.XA patent/CN110426555A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030042857A (en) * | 2001-11-26 | 2003-06-02 | 백정복 | Method of Testing Fault of DC Motor and Device thereof |
| CN101262153A (en) * | 2008-04-21 | 2008-09-10 | 哈尔滨理工大学 | Cage inductive electromotor with detection loop and detection method for its rotor broken bar |
| CN101672894A (en) * | 2009-10-14 | 2010-03-17 | 华北电力大学（保定） | Motor rotor turn-to-turn short circuit diagnosis method based on high-order harmonic shaft voltage signals |
| CN201514468U (en) * | 2009-11-10 | 2010-06-23 | 哈尔滨理工大学 | Cage type induction motor rotor strip breaking failure detecting device and motor with the device |
| CN102072779A (en) * | 2010-11-17 | 2011-05-25 | 哈尔滨工业大学 | Rotor-groove harmonic analysis based method for identifying temperature of sensorless rotor for submersible motor |
| CN108802523A (en) * | 2018-05-31 | 2018-11-13 | 山西大学 | Wind power generator unit frequency converter is monitored on-line and trouble-shooter |
| CN108957322A (en) * | 2018-08-24 | 2018-12-07 | 佛山市顺德区金泰德胜电机有限公司 | The measurement method of magneto counter electromotive force and used measuring device |
Non-Patent Citations (1)
| Title |
|---|
| 吕伟文 主编: "《机械设计基础》", 31 August 2007, 电子科技大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366774A (en) * | 2020-03-19 | 2020-07-03 | 上海梓一测控技术有限公司 | Reverse electromotive force testing equipment and method for automobile EPS motor |
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Application publication date: 20191108 |