CN106452258A - Method and device for parameter detection of three-phase induction motor - Google Patents
Method and device for parameter detection of three-phase induction motor Download PDFInfo
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Abstract
The invention discloses a method for parameter detection of a three-phase induction motor. The method comprises the following steps: performing a direct current test on the three-phase induction motor, thereby detecting stator resistance; repeatedly performing the locked-rotor test on the motor under different current frequencies and detecting fitting inductance and fitting resistance by utilizing the stator resistance, wherein the fitting resistance is a constant when the current frequency is less than or equal to a threshold and is a current frequency function when the current frequency is more than the threshold; calculating rotor resistance, rotor inductance and stator-rotor mutual inductance according to the fitting inductance, the fitting resistance and the stator inductance, wherein the stator inductance is acquired by detecting the motor through a three-phase no-load test. The invention also discloses a device for the parameter detection of the three-phase induction motor. Through the manner, the device can consider the influence of skin effect, the fitting resistance is the current frequency function when the current frequency is more than the threshold, and the accuracy of the detection result is improved.
Description
Technical field
The present invention relates to machine field, more particularly to a kind of three-phase induction motor parameter detection method and device.
Background technology
Three-phase induction motor, also known as asynchronous machine, is to be interacted with rotor windings faradic current by air-gap rotating magnetic field to produce
Raw electromagnetic torque, thus realizing a kind of alternating current generator that energy converting between mechanical is mechanical energy, having that structure is simple, manufacturing and holding
Easily, cheap, reliable, sturdy and durable the advantages of.Three-phase induction motor is a high-order, non-linear, close coupling, changeable
Amount system, its controllability is poor.
In three-phase induction motor control method, what application was more is vector controlled.Vector controlled is by three-phase induction electricity
The stator current vector of machine carries out Coordinate Conversion, thus being decomposed into the current component (exciting current) producing magnetic field and producing torque
Current component (torque current) be controlled by respectively, and control the amplitude between two components and phase place simultaneously, that is, control stator electricity
Flow vector.Vector controlled needs to try to achieve the phase place of rotor flux to orient, and just can carry out coordinate transform.Many utilizations in practical application
Electric moter voltage, electric current, amplitude and phase place to calculate magnetic linkage for the information of rotating speed, this is to three-phase induction motor parameter dependence very
High.If some parameters of three-phase induction motor do not conform to the actual conditions, control performance can be caused to decline and even to break down.
With the rising of rotor current frequency, the eddy current effect of rotor bar will make rotor current be pressed against the upper of sliver
Layer, leads to the CURRENT DISTRIBUTION in sliver uneven, here it is kelvin effect.Kelvin effect cause rotor resistance increase so that
The rotor resistance of three phase induction motor is change at different frequencies.And three-phase induction motor parameter detecting in prior art
Do not consider the impact of kelvin effect, cause to detect that the rotor resistance obtaining may be inconsistent with actual value.
Content of the invention
The invention mainly solves the technical problem of providing a kind of three-phase induction motor parameter detection method and device, can
Solve the problems, such as that in prior art, three-phase induction motor parameter detecting does not consider kelvin effect.
In order to solve above-mentioned technical problem, one aspect of the present invention is：A kind of three-phase induction motor is provided
Parameter detection method, including：Three-phase induction motor is carried out with direct current test to detect stator resistance；Multiple difference is carried out to motor
Stall under power frequency is tested and is utilized stator resistance to detect matching inductance and matching resistance, and matching resistance value is in electric current frequency
It is constant that rate is less than or equal to during threshold value, and power frequency is more than function during threshold value for power frequency；According to matching inductance, matching
Resistance and stator inductance are calculated rotor resistance, inductor rotor and rotor mutual inductance, and wherein stator inductance is that motor is carried out
Three-phase no-load experiment and detect and obtain.
Wherein, the correlation function between matching resistance value and power frequency is quadratic function.
Wherein, motor is carried out repeatedly with the stall under different power frequencies test and utilize stator resistance to detect matching electricity
Sense and matching resistance include：Motor is carried out repeatedly with the stall experiment under different power frequencies, obtains the equivalent resistance of motor, its
In the power frequency tested at least twice be less than or equal to threshold value；It is less than or equal to the experimental result meter of threshold value according to power frequency
Calculation obtains matching inductance and matching resistance：
Wherein k is matching inductance, and R is matching resistance, f1、f2For power frequency and respectively less than or equal to threshold value, Rm1=
Req1-Rs, Rm2=Req2-Rs, Req1、Req2For corresponding equivalent resistance, RsFor stator resistance；Using with following formula (3) according to electric current frequently
The experimental result that rate is more than threshold value is calculated matching resistance：
Wherein k is calculated matching inductance, Rm=Req-Rs, ReqFor corresponding equivalent resistance, RsFor stator resistance.
Wherein, the equivalent resistance obtaining motor includes：Obtain the biphase synchronous rotating frame electricity in vector control system
Pressure Ud、UqWith electric current Id、Iq；Equivalent resistance is calculated according to voltage and current：
Wherein ReqFor equivalent resistance.
Wherein, rotor resistance, inductor rotor and rotor are calculated according to matching inductance, matching resistance and stator inductance
Mutual inductance includes：Inductor rotor LrEqual to stator inductance LsIt is equal to and three-phase no-load experiment is carried out to motor and obtains the equivalent electric of motor
Sense, rotor mutual inductanceRotor resistance
Wherein, the equivalent inductance obtaining motor includes：
Obtain the biphase synchronous rotating frame voltage U in vector control systemd、UqWith electric current Id、Iq；According to voltage and
Current calculation equivalent inductance：
Wherein f is power frequency.
Wherein, the correlation function between matching resistance value and power frequency be using method of least square to matching resistance value with
Power frequency is carried out obtained from Function Fitting.
Wherein, further include：According to the estimated value of function digital simulation resistance, estimation is calculated according to estimated value
Equivalent resistance, calculates the error between the equivalent resistance of estimation and testing result.
In order to solve above-mentioned technical problem, another technical solution used in the present invention is：A kind of three-phase induction electricity is provided
Machine parameter detection device, including：Processor and testing circuit, processor connection detection circuit, testing circuit is also connected with three-phase sense
Answer motor；Processor is used for controlling testing circuit motor to be carried out with direct current experiment to detect stator resistance；Control testing circuit pair
The stall that motor is carried out repeatedly under different power frequencies is tested and utilizes stator resistance to detect matching inductance and matching resistance, intends
Closing resistance value is constant when power frequency is less than or equal to threshold value, and power frequency is more than function during threshold value for power frequency；
Rotor resistance, inductor rotor and rotor mutual inductance, wherein stator are calculated according to matching inductance, matching resistance and stator inductance
Inductance controls testing circuit to carry out three-phase no-load experiment to motor and detect and obtain.
Wherein, testing circuit is the vector control circuit of controlled motor.
The invention has the beneficial effects as follows：Obtained by motor is carried out repeatedly with the stall experiment detection under different power frequencies
Matching resistance, matching resistance is directly proportional to rotor resistance it is contemplated that the impact of kelvin effect, and matching resistance value is big in power frequency
It is the function of power frequency when threshold value, improve the degree of accuracy of testing result.
Brief description
Fig. 1 is the T-I equivalent circuit diagram of three-phase induction motor；
Fig. 2 is the flow chart of three-phase induction motor parameter detection method first embodiment of the present invention；
Fig. 3 is the flow chart of three-phase induction motor parameter detection method 3rd embodiment of the present invention；
Fig. 4 is the schematic diagram of vector control system in three-phase induction motor parameter detection method fourth embodiment of the present invention；
Fig. 5 is in three-phase induction motor parameter detection method one embodiment of the present invention between matching resistance value and power frequency
The schematic diagram of correlation function fitting result；
Fig. 6 is the structural representation of three-phase induction motor parameter detection device first embodiment of the present invention.
Specific embodiment
The T-I equivalent circuit diagram of three-phase induction motor is as shown in figure 1, wherein s is speed discrepancy, RsFor stator resistance, RrFor turning
Sub- resistance, LsFor stator inductance, LrFor inductor rotor, LmFor rotor mutual inductance, stator resistance, rotor resistance, stator inductance, turn
Sub- inductance and rotor mutual inductance are 5 parameters of electric machine needing detection.
By controlling the electric current I being passed throughsCarry out many experiments, every time experiment detection voltage Us, X-X ' port can be calculated
The motor equiva lent impedance seen into, thus obtain the parameter of electric machine.
As shown in Fig. 2 three-phase induction motor parameter detection method first embodiment of the present invention includes：
S1：Three-phase induction motor is carried out with direct current test to detect stator resistance.
Direct current experiment is to lead to DC current to motor, and inductance is equivalent to short circuit, the motor therefore calculating to DC current
Equiva lent impedance is stator resistance.
S2：Stall motor being carried out repeatedly under different power frequencies is tested and is utilized stator resistance to detect matching inductance
With matching resistance.
Stall experiment is to lead to single-phase alternating current to motor, and according to electromagnetic induction principle, now stator field will not enter
Row circumference rotates, and stator field cannot generate the sinusoidal current of three-phase symmetrical in rotor three-phase winding, so that blocking rotor
Turn, during stall, rotor speed is 0, speed discrepancy s=1.
Matching inductance, matching resistance are calculated according to experimental result, wherein matching resistance is directly proportional to rotor resistance.Experiment
Result may refer to equivalent resistance, equivalent inductance or the equiva lent impedance of motor.
When power frequency is relatively low, the impact that can ignore kelvin effect thinks that rotor resistance value keeps constant；With electricity
The rising of stream frequency, kelvin effect makes rotor resistance value become big.Because matching resistance is directly proportional to rotor resistance, when electric current frequency
When rate is less than or equal to threshold value, matching resistance value is constant, and when power frequency is more than threshold value, matching resistance value is power frequency
Function.
In an embodiment of the invention, the correlation function between matching resistance value and power frequency is to use least square
Method is carried out obtained from Function Fitting to matching resistance value and power frequency.In general, the correlation function that matching obtains is two
Secondary function.
S3：Motor is carried out with three-phase no-load test to detect stator inductance.
Three-phase no-load experiment is to lead to three-phase alternating current to motor, and not bringing onto load on armature spindle, now rotor speed
It is approximately equal to stator current rotary speed, then speed discrepancy s can be approximately the resistance in 0, Fig. 1 equivalent circuitBe equivalent to open circuit, detect that the motor equivalent inductance obtaining is equal to stator inductance.
S4：Rotor resistance, inductor rotor and rotor are calculated according to matching inductance, matching resistance and stator inductance mutual
Sense.
It is believed that inductor rotor is equal with stator inductance in three-phase induction motor.Can according to matching inductance and inductor rotor
To calculate rotor mutual inductance, rotor resistance can be calculated according to rotor mutual inductance, inductor rotor and matching resistance.Turn
Sub- resistance value is similar with matching resistance value, is constant when power frequency is less than or equal to threshold value, when power frequency is more than threshold value
Function for power frequency.
It should be noted that the execution of step S3 is upon step s 2 in the present embodiment, before step S4, actual step
The execution of S3 only need to before step S 4, and the execution with step S1, S2 does not need fixing sequencing.
By the enforcement of above-described embodiment, stall experiment detection motor being carried out repeatedly under different power frequencies is intended
Close resistance, matching resistance is directly proportional to rotor resistance it is contemplated that the impact of kelvin effect, matching resistance value is more than in power frequency
It is the function of power frequency during threshold value, improve the degree of accuracy of testing result.Additionally, in existing some detection methods, carrying out
Think and be negligible by the electric current of energized circuit during stall experiment, will inductance in Fig. 2Regard as opening a way, this
Error can be brought further to testing result, and in the present embodiment, not do this simplification, testing result is more accurate.
Three-phase induction motor parameter detection method second embodiment of the present invention, is in three-phase induction motor parameter of the present invention inspection
On the basis of survey method first embodiment, only use equivalent resistance digital simulation inductance and the matching resistance of motor.
Specifically, in stall experiment, speed discrepancy s=1, the equiva lent impedance of motor is：
Wherein ωsFor electric current angular frequency, f is power frequency, ωs=2 π f, R are matching resistance,K is matching inductance,ReqFor the equivalent resistance of motor, XeqEquivalent for motor
Induction reactance.
The motor equivalent resistance being obtained according to experiment, can be calculated：
Wherein RmFor matching resistance withActive component in impedance after parallel connection.
Matching inductance k and matching electricity are calculated according to the experimental result at least twice that power frequency is less than or equal to threshold value
Resistance R：
Wherein f1、f2For power frequency and respectively less than or equal to threshold value, Rm1=Req1-Rs, Rm2=Req2-Rs, Req1It is with frequency
Rate is f1Electric current carry out the stall corresponding motor equivalent resistance that obtains of experiment, Req2It is with frequency as f2Electric current to carry out stall real
Test the corresponding motor equivalent resistance obtaining.It should be noted that the matching resistance R being calculated according to formula (1) and (2) is only applicable
In the case that power frequency is less than or equal to threshold value, and the matching inductance k calculating can consider and is not subject to power frequency
Impact.
Can be released by formula (6)：
When power frequency is more than threshold value, matching resistance R that can directly according to motoreq, stator resistance RsCalculate
Rm, solve formula (3) in conjunction with matching inductance k and power frequency f, thus calculating corresponding matching resistance value, to reduce amount of calculation.Meter
After calculation obtains matching resistance value, Function Fitting can be carried out to obtain pass between the two to matching resistance value and power frequency
Connection function.
Rotor resistance, inductor rotor and rotor mutual inductance are calculated according to matching inductance, matching resistance and stator inductance.
Specifically, Lr=Ls=Leq, wherein LrFor inductor rotor, LsFor stator inductance, LeqBe that motor is carried out with three-phase no-load experiment and
The motor equivalent inductance obtaining.According toRotor mutual inductance can be obtainedAccording to matching resistanceRotor resistance can be obtained
As shown in figure 3, three-phase induction motor parameter detection method 3rd embodiment of the present invention, it is in three-phase induction of the present invention
On the basis of parameter of electric machine detection method first embodiment, further include after step S2：
S5：According to the estimated value of function digital simulation resistance, it is calculated the equivalent resistance of estimation according to estimated value, calculate
The equivalent resistance of estimation calculates the error between estimated value and testing result.
When electric current is more than threshold value, according to estimating of the correlation function digital simulation resistance between matching resistance value and power frequency
Calculation value.Because correlation function is obtained from Function Fitting, therefore one between estimated value and the actually detected matching resistance obtaining
As there is error.If error is more than preset value, represents that the accuracy of correlation function is undesirable, need to select dissimilar
Function re-start Function Fitting, otherwise then represent that the accuracy of correlation function meets the requirements.
It should be noted that the execution of this step should upon step s 2, before step S4, the execution with step S3 is not
Need fixing sequencing.
As shown in figure 4, three-phase induction motor parameter detection method fourth embodiment of the present invention, it is in three-phase induction of the present invention
On the basis of parameter of electric machine detection method first embodiment, detected by the vector control system of motor.
Fig. 4 is the schematic diagram of vector control system, wherein α, β axle composition two-phase rest frame, α axle and A, B, C three-phase
In A phase direction consistent, 90 ° of β axle advanced α axle；D, q axle forms biphase synchronous rotating frame, d axle advanced α axle θ, and q axle is advanced
90 ° of d axle.Iqref、IdrefWith θ for vector control system input instruction value, through analog-digital converter (Analog-to-
Digital Converter, ADC) detect the motor biphase current I obtainingA、IBThe I obtaining after CLARKE and PARK conversiond、
IqWith Idref、IqrefRespectively constitute proportional, integral-derivative (proportion-integral-derivative, PID) controller
Feedback element, PID controller is output as stator voltage Ud、Uq.Biphase synchronous rotating frame voltage Ud、UqBecome through IPARK
Change it is possible to obtain two-phase rest frame voltage Uα、Uβ；Uα、UβThrough SVGEN conversion, generate Ta、TbAnd Tc, Ta、TbAnd Tc
It is that (the comparison time of (Pulse Width Modulation, PWM) gives PWM controller, can obtain for pulse width modulation
Six road pwm signals required for three-phase inverter, the signal that thus can generate approximate sine wave drives three-phase induction motor.
According to Id、IqAnd Ud、UqThe active power of counting circuit and reactive power, thus be calculated the equivalent resistance of circuit and equivalent
Inductance.
Specifically, the apparent energy of motor：
Wherein P is active power, and Q is reactive power.For measurement accuracy, count after selecting the suitable cumulative measurement time
Calculate equivalent resistance and the equivalent inductance of circuit.Particularly when electric current is for sine wave, time of measuring is multiple complete cycles.Now electricity
The equivalent resistance of machine：
Equivalent inductance：
Illustration that in one embodiment of the invention parameter of electric machine detect detailed process is presented herein below, the present embodiment is the present invention
The combination of three-phase induction motor parameter detection method first to fourth embodiment, the three-phase induction motor of detection is Y/ delta connection,
Rated power Pn=0.55kW, rated voltage Un=380/220V, rated current In=1.74/3.0A, rated speed wn=
910r/min.Detected using Tms320f28035DSP chip, PWM frequency is 10kHz.
Direct current experiment is carried out to motor, even Idref=I, Iqref=0, θ=0 °.For the accuracy measuring, carry out difference
Repeatedly measure under electric current.Work as Idref=2,3,4A when test respectively three times, obtain circuit equivalent resistance Req, as shown in table 1：
Table 1
Stator resistance R can be obtained by table 1sFor 5.35 Ω.
Stall experiment is carried out to motor, even Idref=Isin (2 π ft), Iqref=0, θ=0 °.Make I=2A, by changing
Power frequency f, respectively according to the I detectingd、IqAnd Ud、UqCalculate corresponding equivalent resistance Req, as shown in table 2：
Table 2
The threshold value of power frequency is 5Hz, selects the different f less than or equal to threshold value respectively1And f2And it is corresponding equivalent
Resistance, the stator resistance R obtaining in conjunction with direct current experiments, it is calculated the matching electricity under different frequency group using formula (1) and (2)
Sense k and matching resistance R, result of calculation is as shown in table 3：
Table 3
Can be obtained by table 3, matching inductance value k=1.2998, matching resistance value R=3.842.
As power frequency f ＞ 5Hz, according to power frequency f, corresponding equivalent resistance ReqAnd stator resistance RsCan count
Calculate corresponding matching resistance value R, as shown in table 4：
Table 4
Function Fitting is carried out according to matching resistance value R during f ＞ 5Hz in table 4, as shown in figure 5, fitting function is R=
0.00034f2+ 0.04273f+3.4263, according to the estimated value of fitting function digital simulation resistance, as shown in table 5：
Table 5
Estimated value in table 5 is substituted into formulaIt is calculated the equivalent resistance of estimation, Yi Jiyu
Error between testing result, as shown in table 6：
Table 6
As can be seen from Table 6, error is less than 0.06 Ω, represents that the accuracy of correlation function meets the requirements.
Three-phase no-load experiment is carried out to motor, even Idref=2A, Iqref=0, θ=sin (2 π ft), during f=10Hz, surveys
Obtain stator inductance Ls=Leq=0.2272H.Inductor rotor LrWith stator inductance LsEqual, then Lr=Ls=0.2272H, rotor
Mutual inductanceAccording to rotor resistanceCan obtain：As f≤5Hz, Rr=4.22 Ω；Work as f
During ＞ 5Hz, Rr=0.00037f2+0.0462f+3.76Ω.
According to parameter of electric machine testing result, build the speed-sensorless control system based on direct field oriented control
System, voltage x current mixed model, as Flux Observation Model, tests speed estimate value under different rotating speeds, test result such as table 7 institute
Show：
Table 7
Can be obtained by table 7, speed estimate value is close with rotary speed actual value and rotational speed command value, represent parameter of electric machine testing result
Accuracy is high.
As shown in fig. 6, three-phase induction motor parameter detection device first embodiment of the present invention includes：Processor 11 and detection
Circuit 12, processor 11 connection detection circuit 12, testing circuit 12 is also connected with three-phase induction motor.Processor 11 and testing circuit
12 can be discrete different components/chip/circuit it is also possible to be integrated in same chip, be for example used for controlling three-phase induction
Digital Signal Processing (Digital Signal Processing, the DSP) chip of motor.
Processor 11 is used for controlling testing circuit 12 motor to be carried out with direct current experiment to detect stator resistance；Control detection electricity
The stall that road 12 is carried out to motor repeatedly under different power frequencies is tested and is utilized stator resistance to detect matching inductance and matching
Resistance, matching resistance value is constant when power frequency is less than or equal to threshold value, and it is power frequency that power frequency is more than during threshold value
Function；Rotor resistance, inductor rotor and rotor mutual inductance are calculated according to matching inductance, matching resistance and stator inductance,
Wherein stator inductance controls testing circuit 12 to carry out three-phase no-load experiment to motor and detect and obtain.
In three-phase induction motor parameter detection device one embodiment of the present invention, testing circuit is the vector control of controlled motor
Circuit processed, specifically refers to Fig. 4 and its corresponding description.It should be noted that CLARKE, PARK, IPARK in Fig. 4 and
SVGEN conversion can be realized by way of software or hardware, and PID controller, PWM controller and three-phase inverter can be point
Vertical it is also possible to integrate.
In each embodiment of three-phase induction motor parameter detection device of the present invention, the concrete function of each several part refers to the present invention
Corresponding description in three-phase induction motor parameter detection method embodiment, here is not repeated.
It should be understood that disclosed apparatus and method in several embodiments provided by the present invention, can be passed through it
Its mode is realized.For example, device embodiments described above are only schematically, for example, described module or unit
Division, only a kind of division of logic function, actual can have other dividing mode when realizing, for example multiple units or group
Part can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not execute.Another, shown
Or the coupling each other that discusses or direct-coupling or communication connection can be by some interfaces, device or unit indirect
Coupling or communication connection, can be electrical, mechanical or other forms.
The described unit illustrating as separating component can be or may not be physically separate, show as unit
The part showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected according to the actual needs to realize present embodiment scheme
Purpose.
In addition, can be integrated in a processing unit in each functional unit in each embodiment of the present invention it is also possible to
It is that unit is individually physically present it is also possible to two or more units are integrated in a unit.Above-mentioned integrated list
Unit both can be to be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If described integrated unit is realized and as independent production marketing or use using in the form of SFU software functional unit
When, can be stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially
The part in other words prior art being contributed or all or part of this technical scheme can be in the form of software products
Embody, this computer software product is stored in a storage medium, including some instructions with so that a computer
Equipment (can be personal computer, server, or network equipment etc.) or processor (processor) execution the present invention each
The all or part of step of embodiment methods described.And aforesaid storage medium includes：USB flash disk, portable hard drive, read only memory
(ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CD
Etc. various can be with the medium of store program codes.
The foregoing is only embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilization is originally
Equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, is included within the scope of the present invention.
Claims (10)
1. a kind of three-phase induction motor parameter detection method is it is characterised in that include：
Three-phase induction motor is carried out with direct current test to detect stator resistance；
Described motor is carried out repeatedly with the stall under different power frequencies test and utilize described stator resistance to detect matching electricity
Sense and matching resistance, described matching resistance value is constant when described power frequency is less than or equal to threshold value, described power frequency
It is the function of described power frequency during more than threshold value；
Rotor resistance, inductor rotor and rotor are calculated according to described matching inductance, described matching resistance and stator inductance
Mutual inductance, wherein said stator inductance carries out three-phase no-load experiment to described motor and detects and obtain.
2. method according to claim 1 is it is characterised in that pass between described matching resistance value and described power frequency
Connection function is quadratic function.
3. method according to claim 2 it is characterised in that
The described stall described motor being carried out repeatedly under different power frequencies is tested and is utilized described stator resistance to detect plan
Close inductance and matching resistance includes：
Described motor is carried out repeatedly with the stall experiment under different power frequencies, obtains the equivalent resistance of described motor, wherein extremely
Few power frequency tested twice is less than or equal to described threshold value；
Described matching inductance and matching resistance are calculated according to the experimental result that power frequency is less than or equal to described threshold value：
Wherein k is described matching inductance, and R is described matching resistance, f1、f2For power frequency and respectively less than or equal to described threshold value,
Rm1=Req1-Rs, Rm2=Req2-Rs, Req1、Req2For corresponding equivalent resistance, RsFor described stator resistance；
Using with following formula (3), described matching resistance is calculated according to the experimental result that power frequency is more than described threshold value：
Wherein k is calculated described matching inductance, Rm=Req-Rs, ReqFor corresponding equivalent resistance, RsFor described stator electricity
Resistance.
4. method according to claim 3 it is characterised in that
The described equivalent resistance obtaining described motor includes：
Obtain the biphase synchronous rotating frame voltage U in vector control systemd、UqWith electric current Id、Iq；
Described equivalent resistance is calculated according to described voltage and current：
Wherein ReqFor equivalent resistance.
5. method according to claim 3 it is characterised in that
Rotor resistance, inductor rotor and rotor are calculated according to described matching inductance, described matching resistance and stator inductance
Mutual inductance includes：
Described inductor rotor LrEqual to described stator inductance LsIt is equal to and three-phase no-load experiment is carried out to described motor and obtains described electricity
The equivalent inductance of machine, described rotor mutual inductanceDescribed rotor resistance
6. method according to claim 5 it is characterised in that
The described equivalent inductance obtaining described motor includes：
Obtain the biphase synchronous rotating frame voltage U in vector control systemd、UqWith electric current Id、Iq；
Described equivalent inductance is calculated according to described voltage and current：
Wherein f is power frequency.
7. method according to claim 2 it is characterised in that
Correlation function between described matching resistance value and described power frequency is to described matching resistance using method of least square
Value and power frequency are carried out obtained from Function Fitting.
8. method according to claim 1 is it is characterised in that further include：
Calculate the estimated value of described matching resistance according to described function, be calculated the equivalent electric of estimation according to described estimated value
Resistance, calculates the error between the equivalent resistance of described estimation and testing result.
9. a kind of three-phase induction motor parameter detection device is it is characterised in that include：Processor and testing circuit, described process
Device connects described testing circuit, and described testing circuit is also connected with three-phase induction motor；
Described processor is used for controlling described testing circuit described motor to be carried out with direct current experiment to detect stator resistance；Control institute
State the stall that testing circuit carries out repeatedly under different power frequencies to described motor to test and utilize described stator resistance to detect
Matching inductance and matching resistance, described matching resistance value is constant when described power frequency is less than or equal to threshold value, described electricity
Stream frequency is the function of described power frequency when being more than threshold value；According to described matching inductance, described matching resistance and stator inductance
It is calculated rotor resistance, inductor rotor and rotor mutual inductance, wherein said stator inductance is to control described testing circuit to institute
State motor to carry out three-phase no-load experiment and detect obtaining.
10. device according to claim 9 is it is characterised in that described testing circuit is the vector control controlling described motor
Circuit processed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108459271A (en) * | 2018-02-07 | 2018-08-28 | 福建睿能科技股份有限公司 | The detection method and detection device of two-phase induction motor, the device with store function |
| CN108964554A (en) * | 2017-05-18 | 2018-12-07 | Zf 腓德烈斯哈芬股份公司 | The monitoring of the torque of revolving-field type machine |
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