CN106452258B - A kind of three-phase induction motor parameter detection method and device - Google Patents
A kind of three-phase induction motor parameter detection method and device Download PDFInfo
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Abstract
The invention discloses a kind of three-phase induction motor parameter detection methods, comprising: carries out direct current experiment to three-phase induction motor to detect stator resistance；To the stall experiment under motor progress repeatedly different power frequencies and using stator resistance to detect fitting inductance and fitting resistance, fitting resistance value is constant when power frequency is less than or equal to threshold value, is the function of power frequency when power frequency is greater than threshold value；Rotor resistance, inductor rotor and rotor mutual inductance is calculated according to fitting inductance, fitting resistance and stator inductance, wherein stator inductance is to carry out three-phase no-load experiment to motor and detect.The invention also discloses a kind of three-phase induction motor parameter detection devices.By the above-mentioned means, the present invention it is contemplated that kelvin effect influence, fitting resistance value power frequency be greater than threshold value when be power frequency function, improve the accuracy of testing result.
Description
Technical field
The present invention relates to motor fields, more particularly to a kind of three-phase induction motor parameter detection method and device.
Background technique
Three-phase induction motor is also known as asynchronous machine, is produced by air-gap rotating magnetic field and the interaction of rotor windings induced current
Raw electromagnetic torque, to realize that energy converting between mechanical is a kind of alternating current generator of mechanical energy, manufacture simple with structure is held
Easily, the advantages that cheap, reliable for operation, sturdy and durable.Three-phase induction motor is a high-order, non-linear, close coupling, changeable
Amount system, controllability are poor.
In three-phase induction motor control method, using it is more be vector controlled.Vector controlled is by three-phase induction electricity
The stator current vector of machine carries out coordinate conversion, to be decomposed into the current component (exciting current) for generating magnetic field and generate torque
Current component (torque current) be controlled respectively, and control the amplitude and phase between two components simultaneously, i.e. control stator electricity
Flow vector.Vector controlled needs to acquire the phase of rotor flux to orient, and can just be coordinately transformed.It is utilized in practical application more
Electric moter voltage, electric current, revolving speed information calculate the amplitude and phase of magnetic linkage, this to three-phase induction motor parameter dependence very
It is high.If certain parameters of three-phase induction motor do not conform to the actual conditions, it will cause control performance decline and even break down.
With the raising of rotor current frequency, the eddy current effect of rotor bar will make rotor current be pressed against the upper of conducting bar
Layer, causes the current distribution is uneven in conducting bar even, here it is kelvin effects.Kelvin effect causes the increase of rotor resistance, so that
The rotor resistance of three phase induction motor is variation at different frequencies.And three-phase induction motor parameter detecting in the prior art
The influence of kelvin effect is not considered, the rotor resistance for causing detection to obtain may not be inconsistent with actual value.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of three-phase induction motor parameter detection method and devices, can
Solve the problems, such as that three-phase induction motor parameter detecting does not consider kelvin effect in the prior art.
In order to solve the above-mentioned technical problem, one technical scheme adopted by the invention is that: a kind of three-phase induction motor is provided
Parameter detection method, comprising: direct current experiment is carried out to detect stator resistance to three-phase induction motor；Motor is carried out repeatedly different
Under power frequency stall experiment and using stator resistance with detect fitting inductance and fitting resistance, fitting resistance value electric current frequency
Rate is constant when being less than or equal to threshold value, is the function of power frequency when power frequency is greater than threshold value；According to fitting inductance, fitting
Rotor resistance, inductor rotor and rotor mutual inductance is calculated in resistance and stator inductance, and wherein stator inductance is carried out to motor
Three-phase no-load experiment and detect and obtain；Wherein, to the motor carry out stall experiment include: lead to the motor it is single-phase
Alternating current so that rotor stall, when stall the revolving speed of the rotor be 0.
Wherein, the correlation function being fitted between resistance value and power frequency is quadratic function.
Wherein, the stall experiment under different power frequencies is carried out repeatedly and using stator resistance to detect fitting electricity to motor
Sense and fitting resistance include: the stall experiment carried out repeatedly under different power frequencies to motor, obtain the equivalent resistance of motor,
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 fitting inductance and is fitted resistance:
Wherein k is fitting inductance, and R is fitting resistance, f1、f2For power frequency and it is respectively less than or is equal to threshold value, Rm1=
Req1-Rs, Rm2=Req2-Rs, Req1、Req2For corresponding equivalent resistance, RsFor stator resistance；Using following formula (3) according to electric current frequency
Fitting resistance is calculated in the experimental result that rate is greater than threshold value:
Wherein k is the fitting inductance being calculated, Rm=Req-Rs, ReqFor corresponding equivalent resistance, RsFor stator resistance.
Wherein, the equivalent resistance for obtaining motor includes: the two-phase synchronous rotating frame electricity obtained in vector control system
Press 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 fitting inductance, fitting resistance and stator inductance
Mutual inductance includes: inductor rotor LrEqual to stator inductance LsEqual to the equivalent electricity for obtaining motor to motor progress three-phase no-load experiment
Sense, rotor mutual inductanceRotor resistance
Wherein, the equivalent inductance for obtaining motor includes:
Obtain the two-phase synchronous rotating frame voltage U in vector control systemd、UqWith electric current Id、Iq；According to voltage and
Electric current calculates equivalent inductance:
Wherein f is power frequency.
Wherein, the correlation function being fitted between resistance value and power frequency be using least square method to fitting resistance value with
Power frequency carries out obtained from Function Fitting.
Wherein, further comprise: according to the estimated value of function digital simulation resistance, estimation being calculated according to estimated value
Equivalent resistance calculates the error between the equivalent resistance of estimation and testing result.
In order to solve the above-mentioned technical problem, another technical solution used in the present invention is: providing a kind of three-phase induction electricity
Machine parameter detection device, comprising: processor and detection circuit, processor connection detection circuit, detection circuit are also connected with three-phase sense
Answer motor；Processor carries out direct current experiment to motor for controlling detection circuit to detect stator resistance；Control detection circuit pair
Motor carries out repeatedly the stall experiment under different power frequencies and using stator resistance to detect fitting inductance and fitting resistance, intends
Closing resistance value is constant when power frequency is less than or equal to threshold value, is the function of power frequency when power frequency is greater than threshold value；
Rotor resistance, inductor rotor and rotor mutual inductance is calculated according to fitting inductance, fitting resistance and stator inductance, wherein stator
Inductance controls detection circuit and carries out three-phase no-load experiment to motor and detect to obtain；Wherein, the detection circuit is to described
Motor leads to single-phase alternating current so that rotor stall, when stall the revolving speed of the rotor be 0.
Wherein, detection circuit is the vector control circuit for controlling motor.
The beneficial effects of the present invention are: being obtained by the stall experiment detection carried out repeatedly to motor under different power frequencies
It is fitted resistance, fitting resistance is directly proportional to rotor resistance, it is contemplated that the influence of kelvin effect, fitting resistance value are big in power frequency
It is the function of power frequency when threshold value, improves the accuracy of testing result.
Detailed description of the invention
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 fitted between resistance value and power frequency in one embodiment of three-phase induction motor parameter detection method of the present invention
The schematic diagram of correlation function fitting result；
Fig. 6 is the structural schematic diagram 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 rotational speed difference, RsFor stator resistance, RrTo turn
Sub- resistance, LsFor stator inductance, LrFor inductor rotor, LmFor rotor mutual inductance, stator resistance, stator inductance, turns rotor resistance
Sub- inductance and rotor mutual inductance are 5 parameters of electric machine for needing to detect.
By controlling the electric current I being passed throughsMany experiments are carried out, every time experiment detection voltage Us, the port X-X ' can be calculated
The motor equivalent impedance seen into, to 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: direct current experiment is carried out to detect stator resistance to three-phase induction motor.
Direct current experiment is to lead to DC current to motor, and inductance is equivalent to short circuit, therefore calculated motor to DC current
Equivalent impedance is stator resistance.
S2: the stall experiment under different power frequencies is carried out repeatedly and using stator resistance to detect fitting inductance to motor
With fitting resistance.
Stall experiment is to lead to single-phase alternating current to motor, and according to electromagnetic induction principle, stator field will not be at this time
Row circle rotation, stator field can not generate the sinusoidal current of three-phase symmetrical in rotor three-phase winding, to make blocking rotor
Turn, rotor speed is 0 when stall, rotational speed difference s=1.
Fitting inductance is calculated according to experimental result, is fitted resistance, wherein fitting resistance is directly proportional to rotor resistance.Experiment
As a result it can refer to equivalent resistance, equivalent inductance or the equivalent impedance of motor.
When power frequency is lower, the influence that can ignore kelvin effect thinks that rotor resistance value remains unchanged；With electricity
The raising of frequency is flowed, kelvin effect makes rotor resistance value become larger.Since fitting resistance is directly proportional to rotor resistance, when electric current frequency
When rate is less than or equal to threshold value, fitting resistance value is constant, and fitting resistance value is power frequency when power frequency is greater than threshold value
Function.
In an embodiment of the invention, the correlation function being fitted between resistance value and power frequency is using least square
Method carries out obtained from Function Fitting fitting resistance value and power frequency.In general, the correlation function that fitting obtains is two
Secondary function.
S3: three-phase no-load experiment is carried out to detect stator inductance to motor.
Three-phase no-load experiment is to lead to three-phase alternating current to motor, and not bringing onto load on armature spindle, at this time rotor speed
It is approximately equal to stator current rotation speed, then rotational speed difference s can be approximately the resistance in 0, Fig. 1 equivalent circuitIt is equivalent to open circuit, the motor equivalent inductance detected is equal to stator inductance.
S4: it is mutual that rotor resistance, inductor rotor and rotor are calculated according to fitting inductance, fitting resistance and stator inductance
Sense.
In three-phase induction motor, it is believed that inductor rotor is equal with stator inductance.It can according to fitting inductance and inductor rotor
Rotor mutual inductance is calculated, rotor resistance can be calculated according to rotor mutual inductance, inductor rotor and fitting resistance.Turn
Sub- resistance value is similar with fitting resistance value, is constant when power frequency is less than or equal to threshold value, when power frequency is greater than threshold value
For the function of power frequency.
It should be noted that in the present embodiment the execution of step S3 be upon step s 2, before step S4, actual step
The execution of S3 only needs before step S 4, and the execution with step S1, S2 does not need fixed sequencing.
Implementation through the foregoing embodiment carries out repeatedly the stall experiment detection under different power frequencies to motor and is intended
Resistance is closed, fitting resistance is directly proportional to rotor resistance, it is contemplated that the influence of kelvin effect, fitting resistance value are greater than in power frequency
It is the function of power frequency when threshold value, improves the accuracy of testing result.In addition, being carried out in existing certain detection methods
Stall is thought to can be ignored by the electric current of energized circuit when testing, i.e., by the inductance in Fig. 2It regards as opening a way, this
Error can be further brought to testing result, and not do this simplification in the present embodiment, testing result is more accurate.
Three-phase induction motor parameter detection method second embodiment of the present invention is examined in three-phase induction motor parameter of the present invention
On the basis of survey method first embodiment, the equivalent resistance digital simulation inductance and fitting resistance of motor are only used.
Specifically, in stall experiment, rotational speed difference s=1, the equivalent impedance of motor are as follows:
Wherein ωsFor electric current angular frequency, f is power frequency, ωs=2 π f, R are fitting resistance,K is fitting inductance,ReqFor the equivalent resistance of motor, XeqFor the equivalent of motor
Induction reactance.
According to the motor equivalent resistance that experiment obtains, can be calculated:
Wherein RmFor fitting resistance withActive component after parallel connection in impedance.
Fitting inductance k and fitting electricity is calculated according to the experimental result at least twice that power frequency is less than or equal to threshold value
Hinder R:
Wherein f1、f2For power frequency and it is respectively less than or is equal to threshold value, Rm1=Req1-Rs, Rm2=Req2-Rs, Req1For with frequency
Rate is f1Electric current carry out the correspondence motor equivalent resistance tested of stall, Req2To be f with frequency2Electric current to carry out stall real
The correspondence motor equivalent resistance tested.It should be noted that the fitting resistance R being calculated according to formula (1) and (2) is only applicable in
In the case that power frequency is less than or equal to threshold value, and the fitting inductance k being calculated can consider not by power frequency
It influences.
It can be released by formula (6):
It, can be directly according to the fitting resistance R of motor when power frequency is greater than threshold valueeq, stator resistance RsIt is calculated
Rm, formula (3) are solved in conjunction with fitting inductance k and power frequency f, so that corresponding fitting resistance value is calculated, to reduce calculation amount.Meter
After calculation obtains fitting resistance value, Function Fitting can be carried out to obtain pass between the two to fitting resistance value and power frequency
Join function.
Rotor resistance, inductor rotor and rotor mutual inductance is calculated according to fitting inductance, fitting resistance and stator inductance.
Specifically, Lr=Ls=Leq, wherein LrFor inductor rotor, LsFor stator inductance, LeqFor to motor carry out three-phase no-load experiment and
The motor equivalent inductance of acquisition.According toRotor mutual inductance can be obtainedAccording to fitting resistanceRotor resistance can be obtained
As shown in figure 3, three-phase induction motor parameter detection method 3rd embodiment of the present invention, is in three-phase induction of the present invention
On the basis of parameter of electric machine detection method first embodiment, further comprise after step S2:
S5: according to the estimated value of function digital simulation resistance, the equivalent resistance of estimation being calculated according to estimated value, calculates
The equivalent resistance of estimation calculates the error between estimated value and testing result.
When electric current is greater than threshold value, according to estimating for the correlation function digital simulation resistance between fitting resistance value and power frequency
Calculation value.Since correlation function is obtained from Function Fitting, one between estimated value and actually detected obtained fitting resistance
As there are errors.If error is greater than preset value, indicates that the accuracy of correlation function is undesirable, need to select different type
Function re-start Function Fitting, it is on the contrary then indicate 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 fixed sequencing.
As shown in figure 4, three-phase induction motor parameter detection method fourth embodiment of the present invention, 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, and wherein α, β axis form two-phase stationary coordinate system, α axis and A, B, C three-phase
In A phase direction it is consistent, 90 ° of the advanced α axis of β axis；D, q axis forms two-phase synchronous rotating frame, and advanced α axis θ, the q axis of d axis is advanced
90 ° of d axis.Iqref、IdrefIt is the input instruction value of vector control system with θ, through analog-digital converter (Analog-to-
Digital Converter, ADC) detect obtained motor biphase current IA、IBThe I obtained after CLARKE and PARK transformationd、
IqWith Idref、IqrefRespectively constitute proportional, integral-derivative (proportion-integral-derivative, PID) controller
Feedback element, PID controller output be stator voltage Ud、Uq.Two-phase synchronous rotating frame voltage Ud、UqBecome by IPARK
It changes, so that it may obtain two-phase stationary coordinate system voltage Uα、Uβ；Uα、UβIt is converted by SVGEN, generates Ta、TbAnd Tc, Ta、TbAnd Tc
It is that (the comparison time of (Pulse Width Modulation, PWM) gives PWM controller, available for pulse width modulation
The signal driving three-phase induction motor of approximate sine wave thus can be generated in six road pwm signal required for three-phase inverter.
According to Id、IqAnd Ud、UqThe active power and reactive power of counting circuit, so that the equivalent resistance of circuit and equivalent be calculated
Inductance.
Specifically, the apparent energy of motor:
Wherein P is active power, and Q is reactive power.For measurement accuracy, counted after selecting the cumulative measurement time appropriate
Calculate the equivalent resistance and equivalent inductance of circuit.Especially when electric current is sine wave, time of measuring is multiple complete cycles.It is electric at this time
The equivalent resistance of machine:
Equivalent inductance:
Here is that the parameter of electric machine detects detailed process for example, the present embodiment is the present invention in one embodiment of the invention
The combination of first to fourth embodiment of three-phase induction motor parameter detection method, the three-phase induction motor of detection are Y/ delta connection,
Rated power Pn=0.55kW, voltage rating Un=380/220V, rated current In=1.74/3.0A, rated speed wn=
910r/min.It is detected using Tms320f28035DSP chip, PWM modulation frequency is 10kHz.
Direct current experiment is carried out to motor, even Idref=I, Iqref=0, θ=0 °.For the accuracy of measurement, carry out different
It is repeatedly measured under electric current.Work as Idref=2, it is tested respectively three times when 3,4A, obtains 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 °.I=2A is enabled, change is passed through
Power frequency f, respectively according to the I detectedd、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 tested in conjunction with direct currents, the electricity of the fitting under different frequency group is calculated using formula (1) and (2)
Feel k and fitting resistance R, calculated result is as shown in table 3:
Table 3
It can be obtained by table 3, be fitted inductance value k=1.2998, be fitted resistance value R=3.842.
As power frequency f > 5Hz, according to power frequency f, corresponding equivalent resistance ReqAnd stator resistance RsIt can count
Corresponding fitting resistance value R is calculated, as shown in table 4:
Table 4
Function Fitting is carried out according to the fitting resistance value R in table 4 when f > 5Hz, 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 formulaThe equivalent resistance of estimation, Yi Jiyu is calculated
Error between testing result, as shown in table 6:
Table 6
As can be seen from Table 6, error indicates that the accuracy of correlation function meets the requirements less than 0.06 Ω.
Three-phase no-load experiment is carried out to motor, even Idref=2A, IqrefWhen=0, θ=sin (2 π ft), f=10Hz, survey
Obtain stator inductance Ls=Leq=0.2272H.Inductor rotor LrWith stator inductance LsIt is equal, then Lr=Ls=0.2272H, rotor
Mutual inductanceAccording to rotor resistanceIt can obtain: as f≤5Hz, Rr=4.22 Ω；Work as f
When > 5Hz, Rr=0.00037f2+0.0462f+3.76Ω。
According to parameter of electric machine testing result, the speed-sensorless control system based on direct field oriented control is constructed
System, voltage and current mixed model test speed estimate value under different rotating speeds, test result such as 7 institute of table as Flux Observation Model
Show:
Table 7
It can be obtained by table 7, speed estimate value and rotary speed actual value and rotational speed command value approach, and indicate 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 12,11 connection detection circuit 12 of processor, detection circuit 12 are also connected with three-phase induction motor.Processor 11 and detection circuit
12 can be discrete different components/chip/circuit, also can integrate in same chip, such as controlling three-phase induction
Digital Signal Processing (Digital Signal Processing, DSP) chip of motor.
Processor 11 carries out direct current experiment to motor for controlling detection circuit 12 to detect stator resistance；Control detection electricity
Road 12 carries out repeatedly the stall experiment under different power frequencies and using stator resistance to motor to detect fitting inductance and fitting
Resistance, fitting resistance value are constant when power frequency is less than or equal to threshold value, and power frequency is power frequency when being greater than threshold value
Function；Rotor resistance, inductor rotor and rotor mutual inductance is calculated according to fitting inductance, fitting resistance and stator inductance,
Wherein stator inductance control detection circuit 12 carries out three-phase no-load experiment to motor and detects to obtain.
In one embodiment of three-phase induction motor parameter detection device of the present invention, detection circuit is to control the vector control of motor
Circuit processed specifically refers to Fig. 4 and its corresponding description.It should be noted that Fig. 4 in CLARKE, PARK, IPARK and
SVGEN transformation can realize that PID controller, PWM controller and three-phase inverter can be point by way of software or hardware
Vertical, it also can integrate together.
The concrete function of each section can refer to the present invention in each embodiment of three-phase induction motor parameter detection device of the present invention
Corresponding description in three-phase induction motor parameter detection method embodiment, is not repeated herein.
In several embodiments provided by the present invention, it should be understood that disclosed device and method can pass through it
Its mode is realized.For example, device embodiments described above are only schematical, for example, the module or unit
Division, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or group
Part can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown
Or the mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, device or unit it is indirect
Coupling or communication connection can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.Some or all of unit therein can be selected to realize present embodiment scheme according to the actual needs
Purpose.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
It is each that equipment (can be personal computer, server or the network equipment etc.) or processor (processor) execute the present invention
The all or part of the steps of embodiment the method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory
(ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic or disk
Etc. the various media that can store program code.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (10)
1. a kind of three-phase induction motor parameter detection method characterized by comprising
Direct current experiment is carried out to detect stator resistance to three-phase induction motor；
Stall experiment under different power frequencies is carried out repeatedly and using the stator resistance to detect fitting electricity to the motor
Sense and fitting resistance, the fitting resistance value are constant, the power frequency when the power frequency is less than or equal to threshold value
It is the function of the power frequency when greater than threshold value；
Rotor resistance, inductor rotor and rotor is calculated according to the fitting inductance, the fitting resistance and stator inductance
Mutual inductance, wherein the stator inductance is to carry out three-phase no-load experiment to the motor and detect；
Wherein, carrying out the stall experiment to the motor includes: to lead to single-phase alternating current to the motor, so that blocking rotor
Turn, when stall the revolving speed of the rotor be 0.
2. the method according to claim 1, wherein the pass between the fitting resistance value and the power frequency
Connection function is quadratic function.
3. according to the method described in claim 2, it is characterized in that,
The stall experiment under motor progress repeatedly different power frequencies is simultaneously quasi- to detect using the stator resistance
It closes inductance and fitting resistance includes:
Stall experiment under different power frequencies is carried out repeatedly to the motor, the equivalent resistance of the motor is obtained, wherein extremely
Few power frequency tested twice is less than or equal to the threshold value；
The fitting inductance and fitting resistance is calculated according to the experimental result that power frequency is less than or equal to the threshold value:
Wherein k is the fitting inductance, and R is the fitting resistance, f1、f2For power frequency and be respectively less than or be equal to the threshold value,
Rm1=Req1-Rs, Rm2=Req2-Rs, Req1、Req2For corresponding equivalent resistance, RsFor the stator resistance；
The fitting resistance is calculated according to the experimental result that power frequency is greater than the threshold value using following formula (3):
Wherein k is the fitting inductance being calculated, Rm=Req-Rs, ReqFor corresponding equivalent resistance, RsFor the stator electricity
Resistance.
4. according to the method described in claim 3, it is characterized in that,
The equivalent resistance for obtaining the motor includes:
Obtain the two-phase synchronous rotating frame voltage U in vector control systemd、UqWith electric current Id、Iq；
The equivalent resistance is calculated according to the voltage and current:
Wherein ReqFor equivalent resistance.
5. according to the method described in claim 3, it is characterized in that,
Rotor resistance, inductor rotor and rotor is calculated according to the fitting inductance, the fitting resistance and stator inductance
Mutual inductance includes:
The inductor rotor LrEqual to the stator inductance LsThe electricity is obtained equal to three-phase no-load experiment is carried out to the motor
The equivalent inductance of machine, the rotor mutual inductanceThe rotor resistance
6. according to the method described in claim 5, it is characterized in that,
The equivalent inductance for obtaining the motor includes:
Obtain the two-phase synchronous rotating frame voltage U in vector control systemd、UqWith electric current Id、Iq；
The equivalent inductance is calculated according to the voltage and current:
Wherein f is power frequency.
7. according to the method described in claim 2, it is characterized in that,
Correlation function between the fitting resistance value and the power frequency is using least square method to the fitting resistance
Value carries out obtained from Function Fitting with power frequency.
8. the method according to claim 1, wherein further comprising:
The estimated value that the fitting resistance is calculated according to the function, the equivalent electricity of estimation is calculated according to the estimated value
Resistance, calculates the error between the equivalent resistance and testing result of the estimation.
9. a kind of three-phase induction motor parameter detection device characterized by comprising processor and detection circuit, the processing
Device connects the detection circuit, and the detection circuit is also connected with three-phase induction motor；
The processor carries out direct current experiment to the motor for controlling the detection circuit to detect stator resistance；Control institute
Detection circuit is stated to the stall experiment under motor progress repeatedly different power frequencies and using the stator resistance to detect
It is fitted inductance and fitting resistance, the fitting resistance value is constant, the electricity when the power frequency is less than or equal to threshold value
It is the function of the power frequency when flowing frequency greater than threshold value；According to the fitting inductance, the fitting resistance and stator inductance
Rotor resistance, inductor rotor and rotor mutual inductance is calculated, wherein the stator inductance is the control detection circuit to institute
Motor is stated to carry out three-phase no-load experiment and detect；
Wherein, the detection circuit leads to single-phase alternating current to the motor, so that rotor stall, the rotor turns when stall
Speed is 0.
10. device according to claim 9, which is characterized in that the detection circuit is to control the vector control of the motor
Circuit processed.
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