CN103675409A - Measuring method and device for no-load back electromotive force of permanent magnet motor - Google Patents
Measuring method and device for no-load back electromotive force of permanent magnet motor Download PDFInfo
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- CN103675409A CN103675409A CN201310699191.0A CN201310699191A CN103675409A CN 103675409 A CN103675409 A CN 103675409A CN 201310699191 A CN201310699191 A CN 201310699191A CN 103675409 A CN103675409 A CN 103675409A
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Abstract
The invention discloses a measuring method and device for no-load back electromotive force of a permanent magnet motor. According to the method, a frequency converter is adopted for controlling the permanent magnet motor, and after the rotating speed of the permanent magnet motor is raised to excess rotating speed, power is off suddenly to make the permanent magnet motor halt freely; an mutual inductor and a voltage measuring instrument are used for measuring the voltage and the frequency of the permanent magnet motor, voltage data when the voltage and the frequency of the permanent magnet motor reach rated points are collected through the voltage measuring instrument, and the measured voltage data are the no-load back electromotive force of the permanent magnet motor. The measuring device for the no-load back electromotive force of the permanent magnet motor comprises the frequency converter, a killer switch, the voltage mutual inductor and the voltage measuring instrument. The single permanent magnet motor halts freely at the rated rotating speed, the voltage measuring instrument is used for measuring the voltage and the frequency when the rotating speed of the motor is lowered to the rated rotating speed, and the no-load back electromotive force of the permanent magnet motor is measured. The measuring method and device reduce detection conditions and can ensure reliability of the measured data, and a traditional measuring method is simplified.
Description
Technical field
The present invention relates to motor performance detection field, is the unloaded back electromotive force measuring method of a kind of magneto and device specifically.
Background technology
The unloaded back electromotive force of traditional magneto is measured adopt more and is accompanied examination motor drawing method to measure, or double-winding motor list cover drawing method is measured, as: adopt one to accompany examination motor to drag magneto to magneto rated speed, permanent magnet motor stator open circuit, then measure permanent magnet motor stator three-phase voltage, with this, record the unloaded back electromotive force of magneto.In actual testing process, each magneto need to be found the prime mover matching and drag, if Rig up error also easily causes motor shaft to be pulled.Accompanying connecting between examination motor and magneto is also a loaded down with trivial details operation, need to design corresponding shaft coupling, and for powerful magneto, carrying out shaft coupling centering is also a difficult point.
From the above mentioned, how to seek the unloaded back electromotive force measuring method of a kind of new magneto, to realize guaranteeing to simplify traditional experiment method under the prerequisite of data reliability, become the technical matters that those skilled in the art need solution badly.
Through retrieval, do not find identical domestic prior art.
Summary of the invention
Technical matters to be solved by this invention is, the unloaded back electromotive force measuring method of a kind of magneto and device are provided, and to realize simplification traditional measurement method, and guarantees the reliability of measurement data.
The invention provides following technical scheme: the unloaded back electromotive force measuring method of described magneto, adopt Frequency Converter Control magneto, magneto rotating speed is raised to the rotating speed of super required measurement after power-off suddenly make magneto utilize inertia freely to turn round; Use electrical parameter measurement instrument to measure voltage and the frequency of magneto, by electrical parameter measurement instrument, gather the magnitude of voltage under magneto different frequency, draw this curve, find out the magnitude of voltage of rated frequency point, this value is the unloaded back electromotive force of this magneto, and this curve is the unloaded back emf curve of this magneto under different frequency.
From mains supply, through frequency converter, then live wire is connected to magneto after killer switch, and electrical parameter measurement instrument is directly connected or is connected to magneto connection terminal measuring voltage and frequency by voltage sensor; Make magneto idle running to the rotating speed of super required measurement, then power-off suddenly, by electrical parameter measurement instrument, gather correlation parameter, measure motor speed through freely turning round and be down to voltage and the frequency data in stopped process, thereby obtain the unloaded back-emf value of magneto; Concrete steps comprise:
A, select the operation of suitable Frequency Converter Control magneto, with frequency converter, drag magneto idle running to approximately 1.1 times of specified or need to measure rotating speeds, move five minutes, treat that bearing break-in stablizes;
B, to the unexpected power-off of magneto, make it utilize inertia freely to turn round, by electrical parameter measurement instrument survey record, from power-cut time, start to be down to voltage, the frequency curve between stopping to motor speed, finding survey frequency is the electrical voltage point of rated frequency, this point voltage is the unloaded back electromotive force of the magneto that will measure, and this curve is the unloaded back emf curve of magneto.
When utilizing inertia freely to turn round for the separate unit magneto that there is no actuator, the unloaded back electromotive force measuring method of described magneto carries out voltage and frequency measurement.
During measurement, adopt the method for video recording or record to carry out data acquisition.
The unloaded back electromotive force measurement mechanism of described magneto, comprises frequency converter, killer switch and electrical parameter measurement instrument; Described frequency converter is connected on magneto through killer switch; Described electrical parameter measurement instrument is used for being connected to the measurement that magneto connection terminal carries out voltage and frequency.
The unloaded back electromotive force measurement mechanism of described magneto also comprises voltage sensor, and described electrical parameter measurement instrument is connected on magneto connection terminal by voltage sensor.Described electrical parameter measurement instrument is voltage-measuring equipment.
The unloaded back electromotive force measuring method of described magneto is to utilize magneto to have by oneself under the state that rotates (there is no actuator) the unloaded back electromotive force of this motor is measured.
The present invention is a kind of magneto inertia that utilizes, and freely turns round and measures the detection method of the unloaded back electromotive force of magneto, adopts separate unit simplex winding motor measuring method, has solved the problem that separate unit empty load of motor back electromotive force is measured.
Feature of the present invention is, by measuring separate unit magneto, from super rated speed, freely shuts down, and voltage and frequency when use voltage-measuring equipment measurement motor speed is down to rated speed, can record the unloaded back electromotive force of magneto.Than traditional, to dragging mensuration, the present invention has reduced testing conditions, makes to detect simpler and easy, has simplified traditional measurement method, and can guarantee the reliability of measurement data.
Accompanying drawing explanation
The unloaded back electromotive force measuring principle of the magneto schematic diagram that Fig. 1 provides for the embodiment of the present invention.
In figure: 1, electrical network bus, 2, frequency converter, 3, killer switch, 4, voltage transformer (VT), 5, magneto, 6, electrical parameter measurement instrument.
Embodiment
The embodiment of the invention discloses the unloaded back electromotive force measuring method of a kind of magneto, to realize simplification traditional measurement method, and guarantee the reliability of measurement data.The present invention is the measuring method to the unloaded back electromotive force of separate unit magneto, adopts frequency converter to control, magneto rotating speed is risen to the rotating speed of super required measurement after power-off suddenly make magneto utilize inertia freely to turn round; Use electrical parameter measurement instrument to measure voltage and the frequency of magneto, by electrical parameter measurement instrument, gather the magnitude of voltage under magneto different frequency, draw this curve, find out the magnitude of voltage of rated frequency point, this value is the unloaded back electromotive force of this magneto, and this curve is the unloaded back emf curve of this magneto under different frequency.
Below in conjunction with the embodiment of the present invention and accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described.Described magneto be take permagnetic synchronous motor as example.
As shown in Figure 1, the present invention is the unloaded back electromotive force measuring method of a kind of magneto.Described electrical parameter measurement instrument is voltage-measuring equipment.From electrical network bus 1, by frequency converter 2, then live wire accesses magneto 5 after killer switch 3, from magneto copper busbar, draws three voltage measurement lines, can be through overvoltage sensor 4 access voltage-measuring equipments 6; Make magneto 5 idle running, then power-off suddenly, gathers the correlation parameters such as voltage, frequency by voltage-measuring equipment 6.Its metering system is freely to shut down under super rated speed by magneto, and voltage and frequency when measurement motor speed is down to rated point obtain the unloaded back-emf value of magneto with this.Concrete operations are as follows:
1, select suitable frequency converter to control magneto operation, with frequency converter, drag magneto idle running to approximately 1.1 times of rated speeds, guarantee to collect the data of rated point in rotating speed decline process, move five minutes, treat bearing break-in.
2, to the unexpected power-off of magneto; it is freely shut down; using voltage as synchronisation source; voltage, frequency by voltage-measuring equipment survey record between power-cut time starts to be brought down below rated speed to motor speed; finding survey frequency is the electrical voltage point of rated frequency; this point voltage is the unloaded back electromotive force of the magneto that will measure; the electric voltage frequency that can measure according to voltage-measuring equipment judges that whether magneto rotating speed is at ratings, can judge by the frequency of measuring voltage the rotating speed of magneto.
The unloaded back electromotive force measuring method of above-mentioned magneto, when data acquisition is carried out in test shutdown, because speed declines comparatively fast, can adopt the method for video recording to gather.
The unloaded back electromotive force measurement mechanism of described magneto comprises a frequency converter 2, is serially connected in transformer, killer switch 3, a set of voltage transformer (VT) 4 and voltage-measuring equipment 6 between electrical network bus 1 and frequency converter 2; Described frequency converter and killer switch are connected in series, and described voltage transformer (VT) is connected on the extension line (connection terminal) of magneto 5 copper busbars, and described voltage-measuring equipment is connected on voltage transformer (VT).
Described voltage transformer (VT) and voltage-measuring equipment can be three, form a set of; Described three voltage transformer (VT) are connected in three phase lines of motor copper busbar extension line, and described voltage-measuring equipment connects respectively three voltage transformer (VT).
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within being all included in protection scope of the present invention.
Claims (6)
1. the unloaded back electromotive force measuring method of magneto, is characterized in that, adopts Frequency Converter Control magneto, magneto rotating speed is raised to the rotating speed of super required measurement after power-off suddenly make magneto utilize inertia freely to turn round; Use electrical parameter measurement instrument to measure voltage and the frequency of magneto, by electrical parameter measurement instrument, gather the magnitude of voltage under magneto different frequency, draw this curve, find out the magnitude of voltage of rated frequency point, this value is the unloaded back electromotive force of this magneto, and this curve is the unloaded back emf curve of this magneto under different frequency.
2. the unloaded back electromotive force measuring method of magneto according to claim 1, is characterized in that,
From mains supply, through frequency converter, then live wire is connected to magneto after killer switch, and electrical parameter measurement instrument is directly connected or is connected to magneto connection terminal measuring voltage and frequency by voltage sensor; Make magneto idle running to the rotating speed of super required measurement, then power-off suddenly, by electrical parameter measurement instrument, gather correlation parameter, measure motor speed through freely turning round and be down to voltage and the frequency data in stopped process, thereby obtain the unloaded back-emf value of magneto; Concrete steps comprise:
A, select the operation of suitable Frequency Converter Control magneto, with frequency converter, drag magneto idle running to approximately 1.1 times of specified or need to measure rotating speeds, move five minutes, treat that bearing break-in stablizes;
B, to the unexpected power-off of magneto, make it utilize inertia freely to turn round, by electrical parameter measurement instrument survey record, from power-cut time, start to be down to voltage, the frequency curve between stopping to motor speed, finding survey frequency is the electrical voltage point of rated frequency, this point voltage is the unloaded back electromotive force of the magneto that will measure, and this curve is the unloaded back emf curve of magneto.
3. the unloaded back electromotive force measuring method of magneto according to claim 1, it is characterized in that, when the unloaded back electromotive force measuring method of described magneto utilizes inertia freely to turn round for the separate unit magneto that there is no actuator, carry out voltage and frequency measurement.
4. the unloaded back electromotive force measuring method of magneto according to claim 1, is characterized in that, during measurement, adopts the method for video recording or record to carry out data acquisition.
5. the unloaded back electromotive force measurement mechanism of magneto, is characterized in that, comprises frequency converter, killer switch and electrical parameter measurement instrument; Described frequency converter is connected on magneto through killer switch; Described electrical parameter measurement instrument is used for being connected to the measurement that magneto connection terminal carries out voltage and frequency.
6. the unloaded back electromotive force measurement mechanism of magneto according to claim 5, is characterized in that, also comprise voltage sensor, described electrical parameter measurement instrument is connected on magneto connection terminal by voltage sensor; Described electrical parameter measurement instrument is voltage-measuring equipment.
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Cited By (8)
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| CN103944480A (en) * | 2014-04-21 | 2014-07-23 | 许继电气股份有限公司 | Rotor magnetic flux linkage distinguishing method for permanent magnet motor |
| CN104949798A (en) * | 2015-06-03 | 2015-09-30 | 东南大学 | Method of measuring rotational inertia of motor |
| AT516531A1 (en) * | 2014-11-27 | 2016-06-15 | Minebea Co Ltd | Method for determining the voltage induced in the windings of an electric machine at a constant speed by measuring the induced voltage during the run-out of this electric machine |
| CN105717451A (en) * | 2016-01-22 | 2016-06-29 | 刘玉臻 | Pumping unit and method and device for measuring no-load counter electromotive force of permanent magnet motor of pumping unit |
| CN106291058A (en) * | 2016-08-15 | 2017-01-04 | 珠海凌达压缩机有限公司 | Counter electromotive force measuring device and method of motor |
| CN106997025A (en) * | 2017-05-23 | 2017-08-01 | 核工业理化工程研究院 | The measurement apparatus of counter electromotive force of motor |
| CN110850286A (en) * | 2019-10-21 | 2020-02-28 | 上海奥波电子有限公司 | Method for testing electromagnetic characteristics of permanent magnet brushless motor |
| CN112067996A (en) * | 2020-09-16 | 2020-12-11 | 岳延香 | Method, system and device for measuring no-load back electromotive force of permanent magnet synchronous motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103944480A (en) * | 2014-04-21 | 2014-07-23 | 许继电气股份有限公司 | Rotor magnetic flux linkage distinguishing method for permanent magnet motor |
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| AT516531B1 (en) * | 2014-11-27 | 2019-08-15 | Minebea Mitsumi Inc | Method for determining the voltage induced in the windings of an electric machine at a constant speed by measuring the induced voltage during the run-out of this electric machine |
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| CN104949798B (en) * | 2015-06-03 | 2017-08-04 | 东南大学 | A kind of method of measurement motor rotary inertia |
| CN105717451A (en) * | 2016-01-22 | 2016-06-29 | 刘玉臻 | Pumping unit and method and device for measuring no-load counter electromotive force of permanent magnet motor of pumping unit |
| CN105717451B (en) * | 2016-01-22 | 2018-10-30 | 日照正泽自动化科技有限公司 | Pumping unit and pumping unit permanent magnet motor no-load back electromotive force measurement method, device |
| CN106291058A (en) * | 2016-08-15 | 2017-01-04 | 珠海凌达压缩机有限公司 | Counter electromotive force measuring device and method of motor |
| CN106997025A (en) * | 2017-05-23 | 2017-08-01 | 核工业理化工程研究院 | The measurement apparatus of counter electromotive force of motor |
| CN106997025B (en) * | 2017-05-23 | 2024-02-02 | 核工业理化工程研究院 | Measuring device for counter electromotive force of motor |
| CN110850286A (en) * | 2019-10-21 | 2020-02-28 | 上海奥波电子有限公司 | Method for testing electromagnetic characteristics of permanent magnet brushless motor |
| CN112067996A (en) * | 2020-09-16 | 2020-12-11 | 岳延香 | Method, system and device for measuring no-load back electromotive force of permanent magnet synchronous motor |
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