CN109883566A - Electromotor winding temperature detection method based on magnetic flux - Google Patents
Electromotor winding temperature detection method based on magnetic flux Download PDFInfo
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Abstract
The present invention relates to motor running parameter detecting technology, it is at high cost to solve existing electromotor winding temperature detection method, the low problem of accuracy.Technical solution is summarized are as follows: the electromotor winding temperature that the present invention calculates, it is made of a cardinal temperature value and an amendment temperature value two parts, cardinal temperature value is calculated according to the variation relation between magnetic flux and temperature, amendment temperature value is calculated according to the variation relation between temperature and electric current.Beneficial effect is: the present invention calculates amendment temperature value with the change rate of electric current by temperature, cardinal temperature value is modified by correcting temperature value, finally obtained result more true and accurate, simultaneously, Frequency point is corresponding with the parameter prestored, and eliminating influences temperature computation bring because load is different, in addition, the present invention does not need to have saved cost in motor mounting temperature sensor.The present invention is especially suitable for compressors.
Description
Technical field
The present invention relates to motor running parameter detecting technologies, in particular to electromotor winding temperature detection technique.
Background technique
When electric motor operation, for electric current by making motor itself constantly generate heat, electromotor winding temperature is excessively high to will lead to electricity
Motivation failure of insulation, as the temperature rises can make the demagnetization current of certain permanent-magnet materials become smaller, and lead to motor step-out, permanent magnet
Situations such as demagnetization, occurs, and then entire motor operation efficiency is caused to decline or directly scrap, it is therefore desirable to detect motor around
The temperature of group simultaneously carries out corresponding protection control.
Existing electromotor winding temperature detection method generally by temperature sensor detection winding temperature or passes through software
Calculate winding temperature.When detecting using temperature sensor, the mounting temperature sensor on each motor is needed, it is at high cost.
When calculating using software, although the cost of temperature sensor can be saved, the side of winding temperature is calculated by software at present
The calculated winding temperature of method institute is all less accurate.Such as a kind of detection electromotor winding temperature disclosed in CN106404208A
Method and equipment comprising motor, are calculated temperature change value by the variation relation between magnetic flux and temperature, into
And electromotor winding temperature is calculated, it still, is inaccurate by the calculated temperature value of the above method, such as motor running
When, different loads has different phase currents, and the voltage of different current inverter output is also different, the variation of output voltage
It will affect the estimation of temperature.
Summary of the invention
The present invention is that the existing electromotor winding temperature detection method of solution is at high cost, and the low problem of accuracy provides one kind
Electromotor winding temperature detection method based on magnetic flux.
To solve the above problems, the technical solution adopted by the present invention is that:
Electromotor winding temperature detection method based on magnetic flux, including the pre- nonresident portion of parameter and temperature computation part；
The pre- nonresident portion of parameter includes:
If the residual magnetism temperature coefficient of motor is β, by β storage into storage device；
Temperature sensor is laid in the winding position of motor, motor running is made to need to carry out winding temperature detection
Under assigned frequency；
Under the assigned frequency, using any motor running operating condition as initial operating condition, make motor running in initial work
Under condition and detect acquisition φ0、id0、And T0, then according to id0WithIt calculatesWherein, φ0It is the electricity under initial operating condition
Motivation magnetic flux, id0It is the motor direct-axis current under initial operating condition,It is the motor quadrature axis current under initial operating condition, T0It is
The electromotor winding temperature that temperature sensor detects under initial operating condition,It is the motor current under initial operating condition；
It under the assigned frequency, is separately operable motor under at least N number of correction operating condition, and detects and obtain motor point
The φ under N number of correction operating condition is not operated inj、And Tj；Wherein, correction operating condition is the motor fortune different from initial operating condition
Row operating condition, φjIt is the motor flux amount under j-th of correction operating condition,It is the motor d-axis electricity under j-th of correction operating condition
Stream,It is the motor quadrature axis current under j-th of correction operating condition, TjIt is that temperature sensor detects under j-th of correction operating condition
Electromotor winding temperature, j and N are integer, N >=1,1≤j≤N；
According to φj、φ0、T0T of the motor running under N number of correction operating condition is calculated separately out with βj_C, according toWith
Motor running is calculated separately out under N number of correction operating conditionWherein, Tj_CIt is calculated electricity under j-th of correction operating condition
Motivation winding temperature,It is the motor current under j-th of correction operating condition；Then basisAnd the N that motor is run
T under a correction operating conditionj_C、TjWithThe K under the assigned frequency is calculated；Wherein, K is that motor is in same frequency
When, change rate that electromotor winding temperature changes with motor current；
The φ that will be obtained under the assigned frequency0、T0、K and the assigned frequency correspond storage and arrive storage device
In；
The temperature computation part includes:
Motor running frequency is detected in motor operation course, if current motor running frequency is equal in storage device
When any assigned frequency stored, then detects and obtain current motor direct-axis current, current motor quadrature axis current and current
Motor flux amount, and according to current motor direct-axis current, current motor quadrature axis current, current motor flux amount and
φ corresponding to β and the assigned frequency equal with current motor running frequency in storage device0、T0、And K, it calculates
Current electromotor winding temperature.
It is described as advanced optimizingCalculation formula use:It is describedCalculation formula adopt
With
As advanced optimizing, the Tj_CCalculation formula use
As advanced optimizing, as N=1, the calculation formula of K is used
As advanced optimizing, as N >=2, the calculation formula of K is used
As advanced optimizing, the calculation formula of current electromotor winding temperature is used:
If: φ is current motor flux amount, idFor current motor direct-axis current, iqFor current motor quadrature axis current,
idqFor current motor current, T is current electromotor winding temperature；
As advanced optimizing, multiple assigned frequencies for needing to carry out winding temperature detection are stored in the storage device
And φ corresponding with each assigned frequency0、T0、And K.
Beneficial effect is: the last calculated electromotor winding temperature of the present invention is repaired by a cardinal temperature value and one
Positive temperature value two parts composition,It is cardinal temperature value,It is amendment temperature value, according to electric current
After variation is modified cardinal temperature value, the final result more true and accurate；Meanwhile Frequency point and T0, the parameters such as K
It corresponds, eliminating influences temperature computation bring because load is different, and therefore, the temperature results that the present invention finally obtains are more
It is accurate to add.In addition, the present invention is after the pre- nonresident portion of parameter obtains relevant parameter and prestores, the later period only need to be by soft when calculating temperature
Part detection relevant parameter and call the parameter that accordingly prestores, therefore motor does not need mounting temperature sensor, saved at
This.The present invention is especially suitable for compressors.
Specific embodiment
Below with reference to embodiment, technical solution of the present invention is further illustrated.
The principle of the present invention is: the electromotor winding temperature that the present invention finally needs, by a cardinal temperature value and
One amendment temperature value two parts composition,It is calculated according to the variation relation between magnetic flux and temperature
Cardinal temperature value,It is according to the calculated amendment temperature value of variation relation between temperature and electric current, to K
Calculating be then the temperature and temperature sensor that are gone out using theoretical calculation observed temperature difference as temperature deviation, because of temperature biography
The observed temperature of sensor is most really and accurately temperature, then with the temperature deviation divided by the corresponding moment motor current relative to
The current deviation of motor current, obtains temperature with the change rate of electric current, repairs by the way that the change rate is calculated under initial operating condition
Positive temperature value is modified cardinal temperature value, finally obtained result more true and accurate；Meanwhile Frequency point and T0, the ginseng such as K
Number corresponds, and eliminating influences temperature computation bring because load is different, therefore, the temperature results that the present invention finally obtains
More true and accurate.In addition, the present invention is after the pre- nonresident portion of parameter obtains relevant parameter and prestores, the later period only needs when calculating temperature
By software detection relevant parameter and the parameter accordingly prestored is called, therefore motor does not need mounting temperature sensor, section
About cost.
Specifically, a kind of electromotor winding temperature detection method based on magnetic flux provided by the invention is: including ginseng
The pre- nonresident portion of number and temperature computation part；
The pre- nonresident portion of parameter includes:
If the residual magnetism temperature coefficient of motor is β, by β storage into storage device；
Temperature sensor is laid in the winding position of motor, motor running is made to need to carry out winding temperature detection
Under assigned frequency；
Under the assigned frequency, using any motor running operating condition as initial operating condition, make motor running in initial work
Under condition and detect acquisition φ0、And T0, then basisWithIt calculatesWherein, φ0It is under initial operating condition
Motor flux amount,It is the motor direct-axis current under initial operating condition,It is the motor quadrature axis current under initial operating condition,
T0It is the electromotor winding temperature that temperature sensor detects under initial operating condition,It is the motor current under initial operating condition；
It under the assigned frequency, is separately operable motor under at least N number of correction operating condition, and detects and obtain motor point
The φ under N number of correction operating condition is not operated inj、And Tj；Wherein, correction operating condition is the motor fortune different from initial operating condition
Row operating condition, φjIt is the motor flux amount under j-th of correction operating condition,It is the motor d-axis electricity under j-th of correction operating condition
Stream,It is the motor quadrature axis current under j-th of correction operating condition, TjIt is that temperature sensor detects under j-th of correction operating condition
Electromotor winding temperature, j and N are integer, N >=1,1≤j≤N；
According to φj、φ0、T0T of the motor running under N number of correction operating condition is calculated separately out with βj_C, according toWithPoint
Motor running is not calculated under N number of correction operating conditionWherein, Tj_CIt is calculated electronic under j-th of correction operating condition
Machine winding temperature,It is the motor current under j-th of correction operating condition；Then basisAnd motor run it is N number of
Correct the T under operating conditionj_C、TjWithThe K under the assigned frequency is calculated；Wherein, when K is that motor is in same frequency,
The change rate that electromotor winding temperature changes with motor current；
The φ that will be obtained under the assigned frequency0、T0、K and the assigned frequency correspond storage and arrive storage device
In；
Temperature computation part includes:
Motor running frequency is detected in motor operation course, if current motor running frequency is equal in storage device
When any assigned frequency stored, then detects and obtain current motor direct-axis current, current motor quadrature axis current and current
Motor flux amount, and according to current motor direct-axis current, current motor quadrature axis current, current motor flux amount and
φ corresponding to β and the assigned frequency equal with current motor running frequency in storage device0、T0、And K, it calculates
Current electromotor winding temperature.
Above-mentioned detection method is optimized, specifically may is that the electric current of motor in order to obtain,Calculating it is public
Formula uses:Calculation formula useTj_CCalculation formula useTj_CIt is that the temperature value detected under initial operating condition adds the variation relative to temperature under initial operating condition
Value.If time, workload when prestoring parameter in order to save, N=1 can be taken, i.e., is only examined under a correction operating condition
It surveys and calculates, then the calculating of K can useAnd K, Ke Yijian more accurate under same frequency in order to obtain
The data under multiple correction operating conditions are surveyed and calculate, then as N >=2, the calculating of K can be usedWhen
The calculation formula of preceding electromotor winding temperature can use: set φ as current motor flux amount, idFor current motor d-axis
Electric current, iqFor current motor quadrature axis current, idqFor current motor current, T is current electromotor winding temperature；ThenEach Frequency point corresponds to one group of φ0、T0、And K, in order to
Keep the frequency coverage of temperature detection big, can store in the storage device and multiple need to carry out the specified of winding temperature detection
Frequency and φ corresponding with each assigned frequency0、T0、And K.
Embodiment
Concrete example illustrates technical solution of the present invention below, by taking compressor of air conditioner as an example, calculates motor in compressor
Winding temperature, the N=2 in this example.
First by testing the parameter for obtaining and needing to prestore accordingly, this example uses following steps:
Step 1: setting the residual magnetism temperature coefficient of motor as β, by β storage into storage device；Wherein β is by motor
Manufacturer provides.
Step 2: the winding position in motor lays temperature sensor, motor running is made to need to carry out winding temperature
It spends under the assigned frequency of detection；This example hypothesis needs to detect electromotor winding temperature in 50HZ.
Step 3: compressor is made to operate in initial operating condition, (this example assumes initial operating condition are as follows: frequency 50HZ, environment temperature 25
DEG C, system pressure 2.5MP), then detection obtains the motor flux amount φ under initial operating condition0, motor under initial operating condition
Direct-axis currentMotor quadrature axis current under initial operating conditionWith the motor that temperature sensor detects under initial operating condition
Winding temperature T0, then calculate the motor current under initial operating conditionFor motor flux amount,
An armature supply flux observer is arranged by speed-sensorless control in this example, is counted in real time by the flux observer
Calculate the magnetic flux of motor.
Step 4: compressor is made to operate in first correction operating condition, (this example assumes first correction operating condition are as follows: frequency
50HZ, 35 DEG C of environment temperature, system pressure 3MP), then detection obtains the motor flux amount φ under first correction operating condition1、
Motor direct-axis current under first correction operating conditionMotor quadrature axis current under first correction operating conditionWith first
The electromotor winding temperature T that temperature sensor detects under a correction operating condition1；Then it is calculated under first correction operating condition and counts
The electromotor winding temperature T of calculating1_C,And the motor current under first correction operating condition
Step 5: compressor is made to operate in second correction operating condition, (this example assumes second correction operating condition are as follows: frequency
50HZ, 40 DEG C of environment temperature, system pressure 3.5MP), then detection obtains the motor flux amount under second correction operating condition
φ2, motor direct-axis current under second correction operating conditionMotor quadrature axis current under second correction operating conditionWith
The electromotor winding temperature T that temperature sensor detects under second correction operating condition2；Then second correction operating condition is calculated
Under calculated electromotor winding temperature T2_C,And the motor current under second correction operating condition
Step 6: according toAnd above-mentioned 2 T corrected under operating condition that motor is run1_C、T1、T2_C、T2WithThe K under frequency 50HZ is calculated,
Step 7: the φ that will be obtained at said frequencies 50HZ0、T0、K and frequency 50HZ correspond storage to depositing
In storage device.
After pre-storing parameter through the above steps, it can detect under the premise of compressor operates in 50HZ, any operating condition
Electromotor winding temperature, the detailed process of this example temperature detection are as follows:
If: φ is current motor flux amount, idFor current motor direct-axis current, iqFor current motor quadrature axis current,
idqFor current motor current, T is current electromotor winding temperature.
The running frequency of its motor of real-time detection in compressor operational process, if detecting current motor running frequency
Equal to 50HZ, then detects and obtain current motor direct-axis current id, current motor quadrature axis current iqWith current motor flux amount
φ, and call β and the corresponding φ of frequency 50HZ in storage device0、T0、And K, current electricity is then calculated by formula
Motivation winding temperature T, specific formula for calculation are as follows:
By the above process, when can calculate compressor and operating in 50HZ, the temperature of its motor winding under any operating condition
Degree.According to above method, other are needed to detect ginseng corresponding to the Frequency point and each Frequency point of electromotor winding temperature
Number is prestored, and can detect the electromotor winding temperature under any operating condition of other Frequency points.
Claims (7)
1. the electromotor winding temperature detection method based on magnetic flux, including the pre- nonresident portion of parameter and temperature computation part, special
Sign is:
The pre- nonresident portion of parameter includes:
If the residual magnetism temperature coefficient of motor is β, by β storage into storage device；
Temperature sensor is laid in the winding position of motor, motor running is made to need to carry out the specified of winding temperature detection
Under frequency；
Under the assigned frequency, using any motor running operating condition as initial operating condition, make motor running under initial operating condition
And it detects and obtains φ0、And T0, then basisWithIt calculatesWherein, φ0It is the motor under initial operating condition
Magnetic flux,It is the motor direct-axis current under initial operating condition,It is the motor quadrature axis current under initial operating condition, T0It is just
The electromotor winding temperature that temperature sensor detects under beginning operating condition,It is the motor current under initial operating condition；
It under the assigned frequency, is separately operable motor under at least N number of correction operating condition, and detects acquisition motor and transport respectively
φ of the row under N number of correction operating conditionj、And Tj；Wherein, correction operating condition is the motor running work different from initial operating condition
Condition, φjIt is the motor flux amount under j-th of correction operating condition,It is the motor direct-axis current under j-th of correction operating condition,
It is the motor quadrature axis current under j-th of correction operating condition, TjIt is the motor that temperature sensor detects under j-th of correction operating condition
Winding temperature, j and N are integer, N >=1,1≤j≤N；
According to φj、φ0、T0T of the motor running under N number of correction operating condition is calculated separately out with βj_C, according toWithIt counts respectively
Motor running is calculated under N number of correction operating conditionWherein, Tj_CBe under j-th of correction operating condition calculated motor around
Group temperature,It is the motor current under j-th of correction operating condition；Then basisAnd N number of correction that motor is run
T under operating conditionj_C、TjWithThe K under the assigned frequency is calculated；Wherein, it is electronic when K is that motor is in same frequency
The change rate that machine winding temperature changes with motor current；
The φ that will be obtained under the assigned frequency0、T0、K and the assigned frequency correspond storage into storage device；
The temperature computation part includes:
Motor running frequency is detected in motor operation course, is deposited if current motor running frequency is equal in storage device
When any assigned frequency of storage, then detects and obtain current motor direct-axis current, current motor quadrature axis current and current electronic
Machine magnetic flux, and according to current motor direct-axis current, current motor quadrature axis current, current motor flux amount and storage
φ corresponding to β and the assigned frequency equal with current motor running frequency in device0、T0、And K, it calculates current
Electromotor winding temperature.
2. the electromotor winding temperature detection method based on magnetic flux as described in claim 1, it is characterised in that:
It is describedCalculation formula use:It is describedCalculation formula use
3. the electromotor winding temperature detection method based on magnetic flux as described in claim 1, it is characterised in that:
The Tj_CCalculation formula use
4. the electromotor winding temperature detection method based on magnetic flux as described in claim 1, it is characterised in that:
As N=1, the calculation formula of K is used
5. the electromotor winding temperature detection method based on magnetic flux as described in claim 1, it is characterised in that:
As N >=2, the calculation formula of K is used
6. the electromotor winding temperature detection method based on magnetic flux as described in claim 1, it is characterised in that: current electronic
The calculation formula of machine winding temperature uses:
If: φ is current motor flux amount, idFor current motor direct-axis current, iqFor current motor quadrature axis current, idqFor
Current motor current, T are current electromotor winding temperature；
7. the electromotor winding temperature detection method as claimed in any one of claims 1 to 6 based on magnetic flux, it is characterised in that:
Multiple assigned frequencies for needing to carry out winding temperature detection and opposite with each assigned frequency are stored in the storage device
The φ answered0、T0、And K.
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| CN111380626A (en) * | 2020-03-23 | 2020-07-07 | 四川长虹空调有限公司 | Air conditioner compressor winding temperature calculation calibration method |
| CN111473470A (en) * | 2020-04-22 | 2020-07-31 | 四川长虹空调有限公司 | System and method for judging rapid leakage of refrigerant of variable-frequency refrigeration system |
| CN111928447A (en) * | 2020-07-20 | 2020-11-13 | 四川虹美智能科技有限公司 | Refrigerant leakage judging method and device |
| CN112147488A (en) * | 2020-09-25 | 2020-12-29 | 杰华特微电子（杭州）有限公司 | Chip parameter testing and calibrating method |
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