CN103728499A - Method of measuring inductance of armature circuit of direct current motor by using three-phase fully controlled rectifier bridge - Google Patents
Method of measuring inductance of armature circuit of direct current motor by using three-phase fully controlled rectifier bridge Download PDFInfo
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Abstract
The invention provides a method of measuring the inductance of an armature circuit of a direct current motor by using a three-phase fully controlled rectifier bridge. As shown in the attached map 1, the method is characterized in that an electric drive device of a three-phase fully controlled rectifier bridge-direct current motor armature winding is adopted for measurement. When operating normally, the armature circuit of the direct current motor inputs three-phase alternating current and outputs direct current, and the output direct current is connected to the two ends of the direct current motor armature winding through a cable and a flat wave electric reactor. When the inductance of the armature circuit is measured, a direct current output end of the rectifier bridge outputs an alternating voltage by controlling the conduction angle of the three-phase fully controlled rectifier bridge, and therefore the current of the armature winding is alternatively fluctuant. The effective value of current of the armature winding and the effective value of the line voltage of the three-phase input alternating current at the time are measured, and the inductance of the armature circuit of the direct current motor is worked out through formula computing. The method of measuring the inductance of the armature circuit of the direct current motor by using the three-phase fully controlled rectifier bridge has the advantages that the inductance of the armature circuit of the direct current motor is measured by utilizing the existing alternating current-direct current three-phase fully controlled rectification electric drive equipment on site, no additional auxiliary equipment is needed, and the measurement method is accurate, simple and reliable.
Description
Affiliated technical field
The present invention relates to the Electrified Transmission field of the AC-DC of direct current generator, be specifically related to a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value.
Background technology
At present, the method for known measurement armature of direct current motor winding inductance is: at armature winding two ends, apply suitable alternating current power supply, measure alternating current in armature winding, pass through formula:
In formula:
L
n--the trial value of armature circuit inductance, H;
The effective value of U--alternating voltage, V;
Phase angle between θ--alternating voltage and alternating current;
F--frequency, Hz;
The effective value of I--alternating current, A.
Referring to national standard < < GBT1311-2008 direct current generator test method > > P6.
This method of testing is adapted in the laboratory of factory, direct current generator being done.And this inductance trial value only comprises that connection experimental power supply is to the inductance value of the cable of armature of direct current motor winding and the inductance value of armature of direct current motor winding self.In industry spot, after motor and DC rectifier are installed, the cable that the cable of connection armature of direct current motor is used with laboratory is different aspect length and model, and the inductance value of two kinds of cables is also different.In addition, sometimes also can in armature circuit, connect into smoothing reactor.If this two parts inductance value can not correctly count, will have a strong impact on direct current generator transient state runnability.So, in industry spot, must remeasure the inductance value of all electrical equipments that comprise DC drive system output stube cable, smoothing reactor and armature of direct current motor winding---be called armature of direct current motor loop inductance value.For large-scale dc motor, described in national standard < < < < GBT1311-2008 direct current generator test method > >, measure the method for armature circuit inductance and cannot implement in industry spot.For example, the direct current generator that is ZKJ3100/570 for model, capacity 1800kW, armature voltage 800V, electric current 2550A.In order to measure its armature winding circuit inductance value, need to configure separately rated current in the AC transformer of 2000A left and right in industry spot, this is impossible.
Summary of the invention
In order to solve a difficult problem of measuring large-scale dc motor armature winding circuit inductance value in industry spot, the present invention proposes to use in industry spot the method for measuring the total inductance of armature of direct current motor winding loop (comprising armature of direct current motor winding inductance, cable inductance and smoothing reactor inductance) to the three-phase full-controlled rectifier bridge of armature of direct current motor loop configuration.
Embodiment:
The present invention, provides a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor winding loop inductance value, and referring to accompanying drawing 1, accompanying drawing 1 is circuit theory diagrams of the present invention.In Fig. 1, VT1, VT2, VT3, VT4, VT5, VT6 are controllable silicons, and they have formed three-phase full-controlled rectifier bridge, and it is the AC-DC driver of armature of direct current motor winding; Ua, ub, uc are three-phase alternating current input voltages; Id is the electric current of armature circuit of flowing through; The rotor locking of direct current generator is motionless, field copper no power, and the inverse electromotive force of armature winding is just 0 like this, so the armature winding circuit of direct current generator just a pure inductance La of equivalence and a resistance R a in Fig. 1; La comprises armature winding inductance, cable inductance and smoothing reactor inductance, and Ra comprises armature winding resistance, cable resistance and smoothing reactor resistance.
The invention is characterized in: it adopts three-phase full-controlled rectifier bridge---the electric actuator of armature of direct current motor winding is measured.During normal operation, its input is three-phase alternating current, and output is direct current, and output direct current is connected to the two ends of armature of direct current motor winding by cable and smoothing reactor.But when measuring armature circuit inductance value, by controlling the conduction angle of three-phase full-controlled rectifier bridge, at the voltage of an alternation of rectifier bridge DC output end output, thereby make armature winding electric current, be also alternation fluctuation.Measure the now effective value of armature winding electric current and the line voltage effective value of three-phase input AC electricity, by formula, calculate, calculate the inductance value of armature of direct current motor winding loop.
Referring to accompanying drawing 1:
1, according to a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value provided by the invention, adopt three-phase full-controlled rectifier bridge, VT1, VT2, VT3, VT4, VT5, VT6 are controllable silicons, they have formed three-phase full-controlled rectifier bridge, and it is the AC-DC driver of armature of direct current motor winding;
2, according to a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value provided by the invention, the ac input end input three-phase alternating current u of three-phase full-controlled rectifier bridge
a, u
b, u
c.U
aleading u
b120 °, phasing degree, u
bleading u
c120 °, phasing degree, u
cleading u
a120 °, phasing degree.Three-phase alternating current top-stitching voltage effective value is UL;
3, according to a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value provided by the invention, the output of three-phase full-controlled rectifier bridge is connected by the armature winding of cable, smoothing reactor and direct current generator.The rotor locking of direct current generator is motionless, field copper no power, and the inverse electromotive force of armature winding is just 0 like this.So just equivalent pure inductance L of the armature winding circuit of direct current generator in Fig. 1
awith a resistance R
a.La comprises armature winding inductance, cable inductance and smoothing reactor inductance, and Ra comprises armature winding resistance, cable resistance and smoothing reactor resistance;
4, according to a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value provided by the invention, by applying 90 ° of trigger angle---with respect to line voltage u
ac90 ° of zero crossing phase shift angle, allow rectifier bridge output voltage be operated in the fluctuation status of checker, the inductance of armature winding, under fluctuation voltage effect alternately, produces cyclic fluctuation current i d like this, the effective value of this current value is I
d;
5, according to a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value provided by the invention, utilize formula:
Calculate the inductance value of pure inductance La.
The invention has the beneficial effects as follows, can utilize the inductance value in on-the-spot existing, AC-DC three-phase full-controlled rectifier bridge device measuring armature of direct current motor loop, without increasing any optional equipment, measuring method accurately, simple, reliable.
Below in conjunction with example, the present invention is further described:
During test, use the flat ripple reactance that nominal value is 10mH to replace armature winding circuit; Made three-phase fully-controlled controllable silicon rectifying bridge, full-controlled rectifier bridge trigger board and TI2407DSP controller---the three-phase alternating current electric wire voltage rating of controlling Trigger Angle, input is 380VAC.
Accompanying drawing 2 be test record pattern: CH2 record be the commutating voltage waveform of rectifier bridge output---be added in the voltage waveform of smoothing reactor input end; CH3 is the exchange current waveform of rectifier bridge output---the waveform of the electric current by smoothing reactor.
Test findings is as following table:
Can see and use a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor winding loop inductance value of the present invention, measure reactor inductance value and actual inductance value error only has 1.3%, visible the method and device are feasible and accurately.
Claims (6)
1. the present invention, provides a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor winding loop inductance value, referring to accompanying drawing 1, it is characterized in that: it adopts three-phase full-controlled rectifier bridge---and the electric actuator of armature of direct current motor winding is measured.During normal operation, its input is three-phase alternating current, and output is direct current, and output direct current is connected to the two ends of armature of direct current motor winding by cable and smoothing reactor.But when measuring armature circuit inductance value, by controlling the conduction angle of three-phase full-controlled rectifier bridge, at the voltage of an alternation of rectifier bridge DC output end output, thereby make armature winding electric current, be also alternation fluctuation.Measure the now effective value of armature winding electric current and the line voltage effective value of three-phase input AC electricity, by formula, calculate, calculate the inductance value of armature of direct current motor winding loop.
2. a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value according to claim 1, it is characterized in that: referring to accompanying drawing 1, adopt three-phase full-controlled rectifier bridge, VT1, VT2, VT3, VT4, VT5, VT6 are controllable silicons, they have formed three-phase full-controlled rectifier bridge, and it is the AC-DC driver of armature of direct current motor winding.
3. a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value according to claim 1, is characterized in that: referring to accompanying drawing 1, the ac input end of three-phase full-controlled rectifier bridge is inputted three-phase alternating current u
a, u
b, u
c.U
aleading u
b120 °, phasing degree, u
bleading u
c120 °, phasing degree, u
cleading u
a120 °, phasing degree.Three-phase alternating current voltage between lines effective value is U
l.
4. a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value according to claim 1, is characterized in that: referring to accompanying drawing 1, the output of three-phase full-controlled rectifier bridge is connected by the armature winding of cable and direct current generator.The rotor locking of direct current generator is motionless, field copper no power, and the inverse electromotive force of armature winding is just 0 like this.So just equivalent pure inductance L of the armature winding circuit of direct current generator in Fig. 1
awith a resistance R
a.La comprises armature winding inductance, cable inductance and smoothing reactor inductance, and Ra comprises armature winding resistance, cable resistance and smoothing reactor resistance.
5. a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value according to claim 1, is characterized in that: referring to accompanying drawing 1, by applying 90 ° of trigger angle---with respect to line voltage u
ac90 ° of zero crossing phase shift angle, allow rectifier bridge output voltage be operated in the fluctuation status of checker, the inductance of armature winding, under fluctuation voltage effect alternately, produces cyclic fluctuation current i like this
d, the effective value of this current value is I
d.
6. a kind of method of using three-phase full-controlled rectifier bridge to measure armature of direct current motor loop inductance value according to claim 1, is characterized in that: referring to accompanying drawing 1, utilize formula,
Calculate the inductance value of pure inductance La.
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| CN201310578949.5A CN103728499B (en) | 2013-11-15 | 2013-11-15 | Method of measuring inductance of armature circuit of direct current motor by using three-phase fully controlled rectifier bridge |
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| CN201310578949.5A CN103728499B (en) | 2013-11-15 | 2013-11-15 | Method of measuring inductance of armature circuit of direct current motor by using three-phase fully controlled rectifier bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941103A (en) * | 2014-05-09 | 2014-07-23 | 北京航天爱威电子技术有限公司 | Device and method for measuring inductance value of electric reactor in active power filter |
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| CA2125562A1 (en) * | 1991-12-10 | 1993-06-24 | Henrik Huovila | Method for determination of inductance |
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| JP2010071905A (en) * | 2008-09-22 | 2010-04-02 | Sumitomo Heavy Ind Ltd | Method and device of measuring capacitance of electric double layer capacitor |
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2013
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| US3843925A (en) * | 1973-06-11 | 1974-10-22 | V Shlyandin | Method for measuring parameters of complex electric circuit components and device for effecting same |
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| CN103941103A (en) * | 2014-05-09 | 2014-07-23 | 北京航天爱威电子技术有限公司 | Device and method for measuring inductance value of electric reactor in active power filter |
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