CN109883575B  Motor winding temperature detection method based on winding resistance  Google Patents
Motor winding temperature detection method based on winding resistance Download PDFInfo
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 CN109883575B CN109883575B CN201910249841.9A CN201910249841A CN109883575B CN 109883575 B CN109883575 B CN 109883575B CN 201910249841 A CN201910249841 A CN 201910249841A CN 109883575 B CN109883575 B CN 109883575B
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Abstract
The invention relates to a motor operation parameter detection technology, and solves the problems of high cost and low accuracy of the existing motor winding temperature detection method. The technical scheme is summarized as follows: the motor winding temperature calculated by the invention consists of a basic temperature value and a correction temperature value, the basic temperature value is calculated according to the change relation between the resistance and the temperature, and the correction temperature value is calculated according to the change relation between the temperature and the current. The beneficial effects are that: the invention calculates the corrected temperature value through the change rate of the temperature along with the current, corrects the basic temperature value through the corrected temperature value, the final result is more real and accurate, meanwhile, the frequency point corresponds to the prestored parameters, the influence on the temperature calculation caused by different loads is eliminated, in addition, the invention does not need to install a temperature sensor on the motor, and the cost is saved. The invention is particularly suitable for fans.
Description
Technical Field
The invention relates to a motor operation parameter detection technology, in particular to a motor winding temperature detection technology.
Background
When the motor works, the motor is continuously heated by current, the motor insulation failure can be caused by overhigh temperature of a motor winding, the demagnetization current of certain permanent magnet materials is reduced along with the temperature rise, the conditions of motor step loss, permanent magnet demagnetization and the like are caused, and the running efficiency of the whole motor is reduced or the whole motor is directly scrapped, so that the temperature of the motor winding needs to be detected and corresponding protection control is carried out.
The existing motor winding temperature detection method generally detects the winding temperature through a temperature sensor or calculates the winding temperature through software. When the temperature sensor is used for detection, the temperature sensor needs to be installed on each motor, and the cost is high. When software is used for calculation, although the cost of the temperature sensor can be saved, the winding temperature calculated by the method for calculating the winding temperature through software is not accurate at present. For example, CN106404208A discloses a method for detecting a winding temperature of a motor and a device including the motor, which calculate a temperature variation value through a variation relationship between a resistance and a temperature, and further calculate a winding temperature of the motor, however, the temperature value calculated by the above method is not accurate, for example, when the motor is running, different loads have different phase currents, different voltages output by different current frequency converters also differ, and a variation of an output voltage affects an estimation of the temperature.
Disclosure of Invention
The invention provides a motor winding temperature detection method based on winding resistance, which aims to solve the problems of high cost and low accuracy of the existing motor winding temperature detection method.
In order to solve the problems, the invention adopts the technical scheme that:
the motor winding temperature detection method based on winding resistance comprises a parameter prestoring part and a temperature calculating part;
the parameter prestoring part comprises:
setting the resistance temperature coefficient of the motor winding as alpha, and storing the alpha in a storage device;
arranging a temperature sensor at the winding position of the motor to enable the motor to operate at a specified frequency required to carry out winding temperature detection;
under the specified frequency, any motor operation condition is taken as an initial condition, the motor is operated under the initial condition, and R is detected and obtained_{0}、And T_{0}Then according toAndcalculate outWherein R is_{0}Is the resistance of the motor windings in the initial operating condition,is the directaxis current of the motor under the initial working condition,is motor quadrature axis current, T, under initial operating conditions_{0}Is the motor winding temperature detected by the temperature sensor under the initial working condition,is the motor current at the initial operating condition;
under the specified frequency, the motor is respectively operated under at least N correction working conditions, and R of the motor respectively operated under N correction working conditions is detected and acquired_{j}、And T_{j}(ii) a Wherein the correction condition is a motor operation condition different from the initial condition, R_{j}Is the resistance of the motor winding in the jth correction condition,is the motor direct axis current in the jth correction condition,motor quadrature axis current, T, under jth correction condition_{j}The motor winding temperature detected by the temperature sensor under the jth correction working condition is j and N are integers, N is more than or equal to 1, and j is more than or equal to 1 and less than or equal to N;
according to R_{j}、R_{0}、T_{0}And alpha respectively calculating T of the motor under N correction working conditions_{j_C}According toAndrespectively calculating the operation of the motor under N correction working conditionsWherein, T_{j_C}Is the calculated motor winding temperature for the jth correction condition,is the motor current at the jth correction condition; then according toAnd T under N correction conditions under which the motor operates_{j_C}、T_{j}Andcalculating to obtain K under the specified frequency; k is the change rate of the motor winding temperature along with the change of the motor current when the motor is at the same frequency;
r to be obtained at the specified frequency_{0}、T_{0}、K and the specified frequency are stored in a storage device in a onetoone correspondence manner;
the temperature calculation section includes:
detecting the running frequency of the motor in the running process of the motor, if the current running frequency of the motor is equal to any one of the designated frequencies stored in the storage device, detecting and acquiring the current directaxis current of the motor, the current alternatingaxis current of the motor and the current resistance of the motor winding, and according to the current directaxis current of the motor, the current alternatingaxis current of the motor, the current resistance of the motor winding, alpha in the storage device and R corresponding to the designated frequency equal to the current running frequency of the motor_{0}、T_{0}、And K, calculating the current motor winding temperature.
As a further optimization, theThe calculation formula of (2) adopts:the abovementionedIs calculated by
As a further optimization, the T_{j_C}Is calculated by
As a further optimization, when N is 1, the calculation formula of K is adopted
As a further optimization, when N is more than or equal to 2, the calculation formula of K is adopted
As a further optimization, the current calculation formula of the motor winding temperature adopts:
setting: r is the resistance of the current motor winding, i_{d}For the current motor directaxis current, i_{q}For the present motor quadratureaxis current,the current motor current is, and T is the current motor winding temperature;
as a further optimization, a plurality of specified frequencies needing to be subjected to winding temperature detection and R corresponding to each specified frequency are stored in the storage device_{0}、T_{0}、And K.
The beneficial effects are that: the motor winding temperature finally calculated by the invention consists of a basic temperature value and a corrected temperature value,that is to say the value of the basic temperature,namely, the temperature value is corrected, and after the basic temperature value is corrected according to the current change, the finally obtained result is more real and accurate; at the same time, the frequency point and T_{0}And the parameters such as K correspond to each other one by one, so that the influence on temperature calculation caused by different loads is eliminated, and the finally obtained temperature result is more accurate. In addition, after the corresponding parameters are obtained and prestored in the parameter prestoring part, the corresponding parameters are detected and the corresponding prestored parameters are called only through software when the temperature is calculated in the later period, so that the motor does not need to be provided with a temperature sensor, and the cost is saved. The invention is particularly suitable for motors with larger winding resistance values, such as motors of fans.
Detailed Description
The technical scheme of the invention is further explained by combining the embodiment.
The principle of the invention is as follows: the motor winding temperature which is finally obtained by the invention consists of a basic temperature value and a corrected temperature value,namely a basic temperature value calculated according to the variation relationship between the resistance and the temperature,namely, the corrected temperature value is calculated according to the change relation between the temperature and the current, and the calculation of K is the difference between the theoretically calculated temperature and the actually measured temperature of the temperature sensorThe difference is used as temperature deviation, because the actually measured temperature of the temperature sensor is the most real and accurate temperature, the temperature deviation is divided by the current deviation of the motor current at the corresponding moment relative to the motor current under the initial working condition to obtain the change rate of the temperature along with the current, the corrected temperature value calculated by the change rate corrects the basic temperature value, and the finally obtained result is more real and accurate; at the same time, the frequency point and T_{0}And the parameters such as K correspond to each other one by one, so that the influence on temperature calculation caused by different loads is eliminated, and finally the obtained temperature result is more real and accurate. In addition, after the corresponding parameters are obtained and prestored in the parameter prestoring part, the corresponding parameters are detected and the corresponding prestored parameters are called only through software when the temperature is calculated in the later period, so that the motor does not need to be provided with a temperature sensor, and the cost is saved.
Specifically, the invention provides a motor winding temperature detection method based on winding resistance, which comprises the following steps: comprises a parameter prestoring part and a temperature calculating part;
the parameter prestoring part comprises:
setting the resistance temperature coefficient of the motor winding as alpha, and storing the alpha in a storage device;
arranging a temperature sensor at the winding position of the motor to enable the motor to operate at a specified frequency required to carry out winding temperature detection;
under the specified frequency, any motor operation condition is taken as an initial condition, the motor is operated under the initial condition, and R is detected and obtained_{0}、And T_{0}Then according toAndcalculate outWherein R is_{0}Is the resistance of the motor windings in the initial operating condition,is the directaxis current of the motor under the initial working condition,is motor quadrature axis current, T, under initial operating conditions_{0}Is the motor winding temperature detected by the temperature sensor under the initial working condition,is the motor current at the initial operating condition;
under the specified frequency, the motor is respectively operated under at least N correction working conditions, and R of the motor respectively operated under N correction working conditions is detected and acquired_{j}、And T_{j}(ii) a Wherein the correction condition is a motor operation condition different from the initial condition, R_{j}Is the resistance of the motor winding in the jth correction condition,is the motor direct axis current in the jth correction condition,motor quadrature axis current, T, under jth correction condition_{j}The motor winding temperature detected by the temperature sensor under the jth correction working condition is j and N are integers, N is more than or equal to 1, and j is more than or equal to 1 and less than or equal to N;
according to R_{j}、R_{0}、T_{0}And alpha respectively calculating T of the motor under N correction working conditions_{j_C}According toAndrespectively calculating the operation of the motor under N correction working conditionsWherein, T_{j_C}Is the calculated motor winding temperature for the jth correction condition,is the motor current at the jth correction condition; then according toAnd T under N correction conditions under which the motor operates_{j_C}、T_{j}Andcalculating to obtain K under the specified frequency; k is the change rate of the motor winding temperature along with the change of the motor current when the motor is at the same frequency;
r to be obtained at the specified frequency_{0}、T_{0}、K and the specified frequency are stored in a storage device in a onetoone correspondence manner;
the temperature calculation section includes:
detecting the running frequency of the motor in the running process of the motor, if the current running frequency of the motor is equal to any one of the designated frequencies stored in the storage device, detecting and acquiring the current directaxis current of the motor, the current alternatingaxis current of the motor and the current resistance of the motor winding, and according to the current directaxis current of the motor, the current alternatingaxis current of the motor, the current resistance of the motor winding, alpha in the storage device and R corresponding to the designated frequency equal to the current running frequency of the motor_{0}、T_{0}、And K, calculating the current motor winding temperature.
To go upThe detection method is optimized, and specifically comprises the following steps: in order to obtain the current of the motor,the calculation formula of (2) adopts: is calculated byT_{j_C}Is calculated byT_{j_C}Is the value of the temperature detected at the initial condition plus the value of the change from the temperature at the initial condition. If N is 1, that is, the detection and calculation are performed only under one calibration condition, in order to save time and workload when the parameters are prestored, the calculation of K may be performed byIn order to obtain more accurate K under the same frequency, data under multiple correction conditions can be detected and calculated, and when N is larger than or equal to 2, the calculation of K can be carried out by adoptingThe formula for calculating the current motor winding temperature can be as follows: let R be the resistance of the current motor winding, i_{d}For the current motor directaxis current, i_{q}For the present motor quadratureaxis current,the current motor current is, and T is the current motor winding temperature; thenEach frequency point corresponds to a group of R_{0}、T_{0}、And K, in order to make the frequency coverage range of temperature detection large, a plurality of specified frequencies required to be detected by winding temperature and R corresponding to each specified frequency can be stored in the storage device_{0}、T_{0}、And K.
Examples
The following specifically exemplifies the technical solution of the present invention, taking a fan as an example, and calculates the winding temperature of the motor of the fan, where N in this example is 2.
Firstly, the corresponding parameters required to be prestored are obtained through experiments, and the method adopts the following steps:
step one, setting the resistance temperature coefficient of a motor winding as alpha, and storing the alpha in a storage device; where alpha is supplied by the manufacturer of the motor.
Secondly, distributing a temperature sensor at the winding position of the motor to enable the motor to operate at a specified frequency required to carry out winding temperature detection; this example assumes that the motor winding temperature needs to be detected at 50 HZ.
Step three, operating the fan under an initial working condition (the initial working condition is assumed to be frequency 50HZ and ambient temperature is 25 ℃) and detecting to obtain the resistance R of the motor winding under the initial working condition_{0}Direct shaft current of motor under initial working conditionMotor quadrature axis current under initial working conditionAnd the motor winding temperature T detected by the temperature sensor under the initial working condition_{0}Then calculating the motor current under the initial working condition
Fourthly, the fan is operated under a first correction working condition (the first correction working condition is assumed to be frequency 50HZ and ambient temperature 35 ℃ in the example), and then the resistance R of the motor winding under the first correction working condition is detected_{1}Motor direct axis current under first correction conditionMotor quadrature axis current under first correction conditionAnd the temperature T of the motor winding detected by the temperature sensor in the first correction condition_{1}(ii) a Then the calculated motor winding temperature T under the first correction working condition is obtained through calculation_{1_C}，And motor current in the first correction condition
Step five, the compressor is operated under a second correction working condition (the second correction working condition is assumed to be frequency 50HZ and ambient temperature 40 ℃ in the example), and then the resistance R of the motor winding under the second correction working condition is detected_{2}And the motor direct axis current under the second correction working conditionMotor quadrature axis current under second correction conditionAnd a second correction of the motor winding temperature T detected by the temperature sensor in the operating condition_{2}(ii) a Then the calculated motor winding temperature T under the second correction working condition is obtained through calculation_{2_C}，And motor current in a second correction condition
Step six, according toAnd T under the 2 correction working conditions operated by the motor_{1_C}、T_{1}、T_{2_C}、T_{2}Andk at a frequency of 50HZ is calculated,
step seven, obtaining R at the frequency of 50HZ_{0}、T_{0}、K and the frequency 50HZ are stored in the storage device in a onetoone correspondence.
After the parameters are prestored in the steps, the temperature of the motor winding under any working condition on the premise that the fan runs at 50HZ can be detected, and the specific process of temperature detection in the embodiment is as follows:
setting: r is the resistance of the current motor winding, i_{d}For the current motor directaxis current, i_{q}For the present motor quadratureaxis current,for the present motor current, T is the present motor winding temperature.
Detecting the running frequency of the motor of the fan in real time in the running process of the fan, and detecting and acquiring the directaxis current i of the current motor if the detected running frequency of the current motor is equal to 50HZ_{d}Current motor quadrature axis current i_{q}R corresponding to the current motor winding resistance R and recall alpha in the memory means and frequency 50HZ_{0}、T_{0}、And K, calculating the current motor winding temperature T through a formula, wherein the specific calculation formula is as follows:
through the process, the temperature of the motor winding under any working condition when the air outlet machine runs at 50HZ can be calculated. According to the method, other frequency points needing to detect the motor winding temperature and parameters corresponding to the frequency points are prestored, so that the motor winding temperature of other frequency points under any working condition can be detected.
Claims (5)
1. The motor winding temperature detection method based on the winding resistance comprises a parameter prestoring part and a temperature calculating part, and is characterized in that:
the parameter prestoring part comprises:
setting the resistance temperature coefficient of the motor winding as alpha, and storing the alpha in a storage device;
arranging a temperature sensor at the winding position of the motor to enable the motor to operate at a specified frequency required to carry out winding temperature detection;
under the specified frequency, any motor operation condition is taken as an initial condition, the motor is operated under the initial condition, and R is detected and obtained_{0}、i_{d0}、And T_{0}Then according to i_{d0}Andcalculate outWherein R is_{0}Is the resistance of the motor winding in the initial operating condition, i_{d0}Is the directaxis current of the motor under the initial working condition,is motor quadrature axis current, T, under initial operating conditions_{0}Is the motor winding temperature detected by the temperature sensor under the initial working condition,is the motor current at the initial operating condition;
under the specified frequency, the motor is respectively operated under at least N correction working conditions, and R of the motor respectively operated under N correction working conditions is detected and acquired_{j}、And T_{j}(ii) a Wherein the correction condition is a motor operation condition different from the initial condition, R_{j}Is the resistance of the motor winding in the jth correction condition,is the motor direct axis current in the jth correction condition,motor quadrature axis current, T, under jth correction condition_{j}The motor winding temperature detected by the temperature sensor under the jth correction working condition is j and N are integers, N is more than or equal to 1, and j is more than or equal to 1 and less than or equal to N;
according to R_{j}、R_{0}、T_{0}And alpha are respectively calculatedT for motor running under N correction working conditions_{j_C}According toAndrespectively calculating the operation of the motor under N correction working conditionsWherein, T_{j_C}Is the calculated motor winding temperature for the jth correction condition,is the motor current at the jth correction condition; then according toAnd T under N correction conditions under which the motor operates_{j_C}、T_{j}Andcalculating to obtain K under the specified frequency; k is the change rate of the motor winding temperature along with the change of the motor current when the motor is at the same frequency; wherein, T is_{j_C}Is calculated by
R to be obtained at the specified frequency_{0}、T_{0}、K and the specified frequency are stored in a storage device in a onetoone correspondence manner;
the temperature calculation section includes:
detecting the motor running frequency in the running process of the motor, and if the current motor running frequency is equal to the stored motor running frequencyWhen any one of the specified frequencies stored in the storage device is used, the current motor directaxis current, the current motor quadratureaxis current and the current resistance of the motor winding are detected and obtained, and the current motor directaxis current, the current motor quadratureaxis current, the current resistance of the motor winding, alpha in the storage device and R corresponding to the specified frequency equal to the current motor running frequency are used for detecting and obtaining the current motor directaxis current, the current motor quadratureaxis current and the current resistance of the motor winding_{0}、T_{0}、And K, calculating the current motor winding temperature, and setting: r is the resistance of the current motor winding, i_{d}For the current motor directaxis current, i_{q}For the current motor quadratureaxis current, i_{dq}The current motor current is, and T is the current motor winding temperature; the current motor winding temperature is calculated by the formula:
2. the winding resistancebased motor winding temperature detection method of claim 1, wherein:
the abovementionedThe calculation formula of (2) adopts:the abovementionedIs calculated by
3. The winding resistancebased motor winding temperature detection method of claim 1, wherein:
when N is 1, the calculation formula of K is adopted
4. The winding resistancebased motor winding temperature detection method of claim 1, wherein:
when N is more than or equal to 2, the calculation formula of K is adopted
5. The winding resistancebased motor winding temperature detection method according to any one of claims 1 to 4, wherein: storing a plurality of designated frequencies for which the winding temperature detection is required and R corresponding to each of the designated frequencies in the storage device_{0}、T_{0}、And K.
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