CN113125032A - Response measurement system and measurement method of motor temperature monitoring system - Google Patents
Response measurement system and measurement method of motor temperature monitoring system Download PDFInfo
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- CN113125032A CN113125032A CN201911398879.9A CN201911398879A CN113125032A CN 113125032 A CN113125032 A CN 113125032A CN 201911398879 A CN201911398879 A CN 201911398879A CN 113125032 A CN113125032 A CN 113125032A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
- G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
- G01K7/25—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit for modifying the output characteristic, e.g. linearising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
Abstract
The invention provides a response measuring system and a response measuring method of a motor temperature monitoring system, wherein the response measuring system of the motor temperature monitoring system comprises a coil winding, a thermistor temperature sensor, a temperature measuring element, a heat source, a data acquisition unit, a temperature conversion circuit and an upper computer, the output end of the temperature conversion circuit is in communication connection with the upper computer, the signal output end of the data acquisition unit is in communication connection with the upper computer, the upper computer inputs an input value tau in a fitting equation to fit a time and temperature mapping relation curve of the thermistor temperature sensor, and outputs the input value tau when the fitting equation fits the time and temperature mapping relation curve of the thermistor temperature sensor. The response characteristic of the motor temperature monitoring system can be quickly obtained in a short time, the problems of overlarge measurement error and excessively complex bench measurement in the prior art are solved, the measurement efficiency of the response measurement of the motor temperature monitoring system is improved, and the size and the measurement cost of a measurement sample are reduced.
Description
Technical Field
The invention belongs to the technical field of motors, and relates to a response measurement system and a measurement method of a motor temperature monitoring system.
Background
A motor for a new energy vehicle is usually provided with a temperature sensor, and the function of monitoring the temperature of a motor stator in the prior art is to monitor the temperature of the motor in real time during operation and ensure that a controller starts a protection instruction when the temperature of the motor is overheated. Based on the temperature monitoring function, the response performance of a temperature monitoring system in the motor is very important, if the response time of the temperature monitoring system is too long, the motor is subjected to a risk caused by over-temperature or the motor is protected excessively to influence the performance of the motor, and the response characteristic needs to be evaluated carefully during development and approval of the temperature monitoring system.
The response of prior art temperature monitoring systems is typically evaluated by two methods:
(1) estimating the response characteristics of the temperature monitoring system according to the thermal time constant of the temperature sensor part provided by a supplier and the empirical response delay of the temperature sensor/copper wire connection;
(2) a special temperature measuring motor is manufactured to carry out bench measurement, and temperature response characteristics are judged through temperature sensors fed back by the bench and other temperature measuring point signals.
The two methods have a lot of disadvantages to the response test of the temperature monitoring system, and if too many response delays according to the thermal time constant provided by a supplier and the temperature sensor/copper wire connection experience can cause the judged temperature response error to be too large; if the special temperature measurement motor is adopted for rack measurement, the rack measurement is too complex, and the structures of various temperature monitoring systems cannot be repeatedly verified in a large quantity. Therefore, there is a need to develop a test system that quickly assesses the response of a temperature monitoring system.
Disclosure of Invention
The invention aims to provide a response measurement system and a measurement method of a motor temperature monitoring system, and aims to solve the problems that the response measurement of the motor temperature monitoring system in the prior art is inaccurate and the bench measurement is too complex.
In order to solve the above technical problems, a first aspect of the present invention provides a response measurement system of a motor temperature monitoring system, including a coil winding, a thermistor temperature sensor, a temperature measurement element, a heat source, and a processing unit;
the thermistor temperature sensor is used for measuring the temperature of the coil winding;
the temperature measuring element is used for measuring the temperature of a measuring point on the coil winding, which is close to the thermistor temperature sensor;
the heat source is used for heating the coil winding;
the processing unit is in communication connection with the thermistor temperature sensor and the temperature measuring element;
the processing unit is used for obtaining a response constant value tau of the motor temperature monitoring system according to the temperature data measured by the temperature measuring element and the measurement data of the thermistor temperature sensor.
Optionally, the processing unit is further configured to convert the measurement data of the thermistor temperature sensor into temperature data of the thermistor temperature sensor, and obtain a time-temperature mapping relation curve L1 of the thermistor temperature sensor;
acquiring a mapping relation curve L2 of the time and the temperature of the temperature measuring element;
and the processing unit obtains a response constant value tau of the motor temperature monitoring system according to the L1 and the L2.
Optionally, the processing unit includes a data collector, a temperature conversion circuit and an upper computer;
the data collector is used for reading the temperature data measured by the temperature measuring element;
the temperature conversion circuit is used for acquiring the measurement data of the thermistor temperature sensor and converting the measurement data to obtain the temperature data of the thermistor temperature sensor;
the signal output end of the thermistor temperature sensor is connected to the input end of the temperature conversion circuit, and the output end of the temperature conversion circuit is in communication connection with the upper computer;
the signal input end of the data collector is connected to the temperature measuring element, and the signal output end of the data collector is in communication connection with the upper computer;
the upper computer is used for acquiring the L1;
obtaining the L2; and obtaining a response constant value tau of the motor temperature monitoring system according to the L1 and the L2.
Optionally, the tau is obtained by a fitting equation, where the fitting equation is:
Tsensor(t1)＝Tsensor(t0)+[Tactual(t1)-Tsensor(t0)]*(1-e(-[t1-t0]/tau))
wherein t0 and t1 are times, Tsenor (t1) is the fitting temperature at the time of t1, Tsenor (t0) is the fitting temperature at the time of t0, and Tactual (t1) is the temperature measured by the temperature measuring element at the time of t 1.
Optionally, the temperature conversion circuit is a resistance-potential signal conversion circuit.
Optionally, the heating position of the coil winding is close to the measuring point of the thermistor temperature sensor.
Optionally, the temperature measuring element is a contact temperature measuring element or a non-contact temperature measuring element.
Optionally, the contact temperature measuring element is a thermocouple, and the non-contact temperature measuring element is an infrared thermometer.
Optionally, the coil winding is provided with a coil winding, and the coil winding is provided with a coil winding and a temperature sensor support.
Optionally, the temperature measuring element is a thermocouple, a groove is formed in a portion of the coil winding, which is connected with the temperature sensor support, and the thermocouple is embedded in the groove;
or the temperature measuring element is an infrared thermometer, the infrared thermometer and the coil winding are arranged at intervals, and a detection area of the infrared thermometer covers the coil winding.
A second aspect of the present invention provides a response measurement method of a motor temperature monitoring system for temperature monitoring of a stator of the motor, comprising the steps of:
s1: heating the coil winding by adopting a heat source;
s2: measuring the temperature of the coil winding by adopting a thermistor temperature sensor, and outputting the measurement data of the thermistor temperature sensor through a temperature conversion circuit;
s3: measuring the actual temperature of a measuring point on the coil winding, which is close to the thermistor temperature sensor, by using a temperature measuring element, and outputting the measuring data of the temperature measuring element through a data acquisition unit;
s4: the upper computer establishes a time and temperature mapping relation curve of the thermistor temperature sensor according to data output by the temperature conversion circuit, and establishes a time and temperature mapping relation curve of the temperature measuring element according to data output by the data acquisition unit;
s5: the upper computer inputs an input value tau in a fitting equation to fit a time-temperature mapping relation curve of the thermistor temperature sensor, and outputs the input value tau when the fitting equation fits the time-temperature mapping relation curve of the thermistor temperature sensor as an equivalent thermal response time constant of the thermistor temperature sensor;
the fitting equation is:
Tsensor(t1)＝Tsensor(t0)+[Tactual(t1)-Tsensor(t0)]*(1-e(-[t1-t0]/tau))
wherein t0 and t1 are times, Tsenor (t1) is the fitting temperature at the time of t1, Tsenor (t0) is the fitting temperature at the time of t0, and Tactual (t1) is the temperature measured by the temperature measuring element at the time of t 1.
Optionally, the input value tau is input by a manual input or an automatic generation manner of the upper computer.
Optionally, the temperature measuring element is a thermocouple.
Optionally, the S1 specifically includes:
immersing the coil winding into a high-temperature constant-temperature oil groove to heat the position, close to the thermistor temperature sensor, on the coil winding;
or connecting the lead wires of the same phase on the coil winding with the positive and negative electrodes of a low-voltage direct-current power supply respectively to heat the position, close to the thermistor temperature sensor, on the coil winding;
or a hot air generating device is arranged at a position close to the coil winding, and the position on the coil winding close to the thermistor temperature sensor is heated by the hot air generated by the hot air generating device.
Optionally, in the fitting equation, the amount of change of the temperature data measured by the temperature measuring element in the time interval from the time t0 to the time t1 is 100 ℃.
Compared with the prior art, the invention provides a response measurement system and a measurement method of a motor temperature monitoring system, the response measurement system of the motor temperature monitoring system comprises a coil winding, a thermistor temperature sensor, a temperature measuring element, a heat source, a data acquisition unit, a temperature conversion circuit and an upper computer, the data acquisition unit is used for reading temperature data measured by the temperature measuring element, the temperature conversion circuit is used for acquiring the measured data of the thermistor temperature sensor and converting the measured data into the temperature data of the thermistor temperature sensor, the signal output end of the thermistor temperature sensor is connected to the input end of the temperature conversion circuit, the output end of the temperature conversion circuit is in communication connection with the upper computer, the signal input end of the data acquisition unit is connected to the temperature measuring element, the signal output end of the data acquisition unit is in communication connection with the upper computer, the upper computer is stored with a fitting equation and is used for: and drawing a time and temperature mapping relation curve of the thermistor temperature sensor, drawing a time and temperature mapping relation curve of the temperature measuring element, inputting an input value tau in a fitting equation to fit the time and temperature mapping relation curve of the thermistor temperature sensor, and outputting the input value tau when the fitting equation fits the time and temperature mapping relation curve of the thermistor temperature sensor. The simulation system can simulate local actual structures such as a coil winding, a temperature sensor and a temperature sensor support of a motor stator, can quickly obtain the response characteristic of a motor temperature monitoring system in a short time, and can quickly replace different temperature sensors to measure. The measurement system solves the problems of overlarge measurement error and excessively complicated bench measurement in the prior art, remarkably improves the measurement efficiency of response measurement of the motor temperature monitoring system, and greatly reduces the size and the measurement cost of a measurement sample.
The invention provides a response measurement method of a motor temperature monitoring system, which comprises the steps of measuring the temperature of a coil winding by adopting a thermistor temperature sensor, outputting the measurement data of the thermistor temperature sensor through a temperature conversion circuit, measuring the actual temperature of a measurement point, close to the thermistor temperature sensor, on the coil winding by adopting a temperature measurement element, outputting the measurement data of the temperature measurement element through a data acquisition unit, establishing a time and temperature mapping relation curve of the thermistor temperature sensor by an upper computer according to the data output by the temperature conversion circuit, establishing a time and temperature mapping relation curve of the temperature measurement element according to the data output by the data acquisition unit by the upper computer, and fitting the time and temperature mapping relation curve of the thermistor temperature sensor by inputting an input value tau in a fitting equation by the upper computer, and outputting the input value tau when the fitting equation is used for fitting the time-temperature mapping relation curve of the thermistor temperature sensor to serve as the equivalent thermal response time constant of the thermistor temperature sensor. The measuring method solves the problems of overlarge measuring error and overlarge bench measurement in the prior art, obviously improves the measuring efficiency of response measurement of the motor temperature monitoring system, and greatly reduces the size and the measuring cost of a measuring sample.
Drawings
FIG. 1 is a schematic structural diagram of a main body portion of a response measurement system of a motor temperature monitoring system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a time-to-temperature mapping of a thermistor temperature sensor and a time-to-temperature mapping of a temperature measuring element according to an embodiment of the present invention;
10-thermistor temperature sensor; 11-a coil winding; 12-heating position of coil winding; 13-a temperature sensor support; 14-temperature measuring element.
Detailed Description
The following describes a response measurement system and a measurement method of a motor temperature monitoring system according to the present invention in further detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the appended claims and the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements.
Example one
Fig. 1 is a schematic structural diagram of a main body part of a response measurement system of a motor temperature monitoring system according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram comparing a time-temperature mapping curve of a thermistor temperature sensor 10 and a time-temperature mapping curve of a temperature measuring element 14 according to an embodiment of the present invention. Referring to fig. 1 and 2, a response measuring system of a motor temperature monitoring system according to an embodiment of the present invention includes a coil winding 11, a thermistor temperature sensor 10, a temperature measuring element 14, a heat source, and a processing unit. The thermistor temperature sensor 10 is used to measure the temperature of the coil winding 11. The temperature measuring element 14 is used for measuring the temperature of a measuring point on the coil winding 11 close to the thermistor temperature sensor 10. The heat source is used for heating the coil winding 11, and the processing unit is in communication connection with the thermistor temperature sensor 10 and the temperature measuring element 14. The processing unit is used for obtaining a response constant value tau of the motor temperature monitoring system according to the temperature data measured by the temperature measuring element 14 and the measurement data of the thermistor temperature sensor 10.
Optionally, the processing unit is further configured to convert the measurement data of the thermistor temperature sensor 10 into temperature data of the thermistor temperature sensor 10, and obtain a time-temperature mapping curve L1 of the thermistor temperature sensor 10. A time versus temperature curve L2 for the temperature sensing element 14 can also be obtained. And the processing unit obtains a response constant value tau of the motor temperature monitoring system according to the L1 and the L2.
Optionally, the processing unit includes a data collector, a temperature conversion circuit, and an upper computer. The data collector is used for reading the temperature data measured by the temperature measuring element 14, and the temperature conversion circuit is used for collecting the measurement data of the thermistor temperature sensor 10 and converting the measurement data to obtain the temperature data of the thermistor temperature sensor 10. The signal output end of the thermistor temperature sensor 10 is connected to the input end of the temperature conversion circuit, and the output end of the temperature conversion circuit is in communication connection with the upper computer. The signal input end of the data acquisition unit is connected to the temperature measuring element 14, and the signal output end of the data acquisition unit is in communication connection with the upper computer. The upper computer is used for acquiring the L1 and can also acquire the L2. And obtaining a response constant value tau of the motor temperature monitoring system according to the L1 and the L2.
Optionally, the tau is obtained by fitting an equation, the fitting equation being:
Tsensor(t1)＝Tsensor(t0)+[Tactual(t1)-Tsensor(t0)]*(1-e(-[t1-t0]/tau))
wherein t0 and t1 are times, Tsensor (t1) is the fitting temperature at time t1, Tsensor (t0) is the fitting temperature at time t0, and Tactual (t1) is the temperature measured by the temperature measuring element 14 at time t 1.
The response capability of the motor temperature monitoring system is evaluated by indirectly reflecting the self temperature response capability of the thermistor temperature sensor 10 through the input value tau, so that the local actual structures of a coil winding 11, a temperature sensor bracket 13 and the like of a motor stator can be simulated, the response characteristic of the motor temperature monitoring system can be quickly obtained in a short time, and different temperature sensors can be quickly replaced for measurement. The measurement system solves the problems of overlarge measurement error and excessively complicated bench measurement in the prior art, remarkably improves the measurement efficiency of response measurement of the motor temperature monitoring system, and greatly reduces the size and the measurement cost of a measurement sample.
Further, the temperature conversion circuit is a resistance-potential signal conversion circuit.
Further, the heating position 12 of the coil winding is close to the measuring point of the thermistor temperature sensor 10. To obtain a measurement result in a short time, the measurement efficiency can be improved. It should be appreciated that the heating locations 12 of the coil windings in fig. 1 are for illustration only, and in practice the heating locations 12 of the coil windings may be elsewhere on the coil windings 11.
Further, the temperature measuring element 14 is a contact temperature measuring element or a non-contact temperature measuring element.
Further, the upper computer is a PC or an industrial personal computer.
Further, the contact temperature measuring element is a thermocouple, and the non-contact temperature measuring element is an infrared thermometer. The thermal capacity of the thermocouple is very small, and the temperature data measured by the thermocouple can be equivalently considered as the actual temperature of the measuring point of the thermistor temperature sensor 10. It should be appreciated that such a limitation is only intended to illustrate a specific kind of the contacting temperature measuring element, which in practice may also be a fiber optic temperature sensor, and the non-contacting temperature measuring element, which may also be a precision radiation pyrometer.
Further, still include temperature sensor support 13, temperature sensor support 13's one end fixed connection in on the coil winding 11, the other end connect in temperature sensor's input.
Further, the temperature measuring element 14 is a thermocouple, a groove is formed in a portion, connected with the temperature sensor support 13, of the coil winding 11, and the thermocouple is embedded in the groove, so that a temperature measuring result of the contact type temperature measuring element 14 is more accurate, and accuracy of a response measuring system of the motor temperature monitoring system is improved.
Or, the temperature measuring element 14 is an infrared thermometer, the infrared thermometer and the coil winding 11 are arranged at an interval, and a detection area of the infrared thermometer covers the coil winding 11. Therefore, the detection area of the infrared thermometer is prevented from covering other objects, such as the temperature sensor bracket 13, and the accuracy of the response measurement system of the motor temperature monitoring system can be improved.
Example two
The invention provides a response measuring method of a motor temperature monitoring system, which is used for monitoring the temperature of a stator of a motor and comprises the following steps:
s1, heating the coil winding 11 by adopting a heat source;
s2: measuring the temperature of the coil winding 11 by using a thermistor temperature sensor 10, and outputting the measurement data of the thermistor temperature sensor 10 through a temperature conversion circuit;
s3: measuring the actual temperature of a measuring point on the coil winding 11, which is close to the thermistor temperature sensor 10, by using a temperature measuring element 14, and outputting the measuring data of the temperature measuring element 14 through a data acquisition unit;
s4: the upper computer establishes a time and temperature mapping relation curve of the thermistor temperature sensor 10 according to the data output by the temperature conversion circuit, and establishes a time and temperature mapping relation curve of the temperature measuring element 14 according to the data output by the data acquisition unit;
s5: the upper computer inputs an input value tau in a fitting equation to fit a time-temperature mapping relation curve of the thermistor temperature sensor 10, and outputs the input value tau when the fitting equation fits the time-temperature mapping relation curve of the thermistor temperature sensor 10, wherein the input value tau is used as an equivalent thermal response time constant of the thermistor temperature sensor 10;
the fitting equation is:
Tsensor(t1)＝Tsensor(t0)+[Tactual(t1)-Tsensor(t0)]*(1-e(-[t1-t0]/tau))
wherein, t0And t1Is time, Tsensor(t1) Is t1Fitting temperature at time, Tsensor(t0) Is t0Fitting temperature at time, Tactual(t1) Is t1The temperature measured by the temperature sensing element 14 at that time.
The method can simulate the local actual structures of the coil winding 11, the temperature sensor bracket 13 and the like of the motor stator, can quickly obtain the response characteristic of the motor temperature monitoring system in a short time, and can quickly replace different temperature sensors for measurement. The measuring method solves the problems of overlarge measuring error and overlarge bench measurement in the prior art, obviously improves the measuring efficiency of response measurement of the motor temperature monitoring system, and greatly reduces the size and the measuring cost of a measuring sample.
Further, the input value tau is input by manual input or automatically generated by the upper computer.
Further, the temperature measuring element 14 is a thermocouple. The thermal capacity of the thermocouple is very small, and the temperature data measured by the thermocouple can be equivalently considered as the actual temperature of the measuring point of the thermistor temperature sensor 10. It should be appreciated that such a limitation is merely used to illustrate the kind of the temperature measuring element 14, and the temperature measuring element 14 may be a temperature measuring element having high measurement accuracy such as an infrared thermometer.
Further, the heat source may heat the coil winding 11 in the following manners:
immersing the coil winding 11 in a high-temperature constant-temperature oil tank to heat the position, close to the thermistor temperature sensor 10, on the coil winding 11;
or, the conducting wires of the same phase on the coil winding 11 are respectively connected with the positive and negative electrodes of a low-voltage direct-current power supply to heat the position, close to the thermistor temperature sensor 10, on the coil winding 11;
or, a hot air generating device is disposed at a position close to the coil winding 11, and the position on the coil winding 11 close to the thermistor temperature sensor 10 is heated by the hot air generated by the hot air generating device.
It should be appreciated that such a limitation is merely illustrative of the manner in which the heat source heats the coil winding 11, and the manner in which the heat source heats the coil winding 11 may also be heating by infrared radiation heating or the like.
Further, from t in the fitting equation0Time to t1Within the time interval of the moment, when the variation of the temperature data measured by the temperature measuring element 14 reaches 100 ℃, the accuracy of a response measuring system of the motor temperature monitoring system is improved, and at t0Time to t1The greater the amount of change in the temperature data measured by the temperature sensing element 14 over the time interval at that moment, the closer the input value tau in the fitting equation is to the actual thermal response time constant of the thermistor temperature sensor 10, and the greater the accuracy of the response measurement system of the motor temperature monitoring system, it being appreciated that such a limitation is merely illustrative of the amount of change in the temperature data measured by the temperature sensing element 14, t0Time to t1The amount of change in the temperature data measured by the temperature measuring element 14 in the time interval of the time may be 70 ℃ or 140 ℃.
In summary, the present invention provides a response measurement system and a measurement method of a motor temperature monitoring system, the response measurement system of the motor temperature monitoring system includes a coil winding, a thermistor temperature sensor, a temperature measuring element, a heat source, a data acquisition unit, a temperature conversion circuit and an upper computer, the data acquisition unit is used for reading temperature data measured by the temperature measuring element, the temperature conversion circuit is used for acquiring the measured data of the thermistor temperature sensor and converting the measured data into temperature data of the thermistor temperature sensor, a signal output end of the thermistor temperature sensor is connected to an input end of the temperature conversion circuit, an output end of the temperature conversion circuit is communicatively connected to the upper computer, a signal input end of the data acquisition unit is connected to the temperature measuring element, a signal output end of the data acquisition unit is communicatively connected to the upper computer, the upper computer is stored with a fitting equation and is used for: and drawing a time and temperature mapping relation curve of the thermistor temperature sensor, drawing a time and temperature mapping relation curve of the temperature measuring element, inputting an input value tau in a fitting equation to fit the time and temperature mapping relation curve of the thermistor temperature sensor, and outputting the input value tau when the fitting equation fits the time and temperature mapping relation curve of the thermistor temperature sensor. The simulation system can simulate local actual structures such as a coil winding, a temperature sensor and a temperature sensor support of a motor stator, can quickly obtain the response characteristic of a motor temperature monitoring system in a short time, and can quickly replace different temperature sensors to measure. The measurement system solves the problems of overlarge measurement error and excessively complicated bench measurement in the prior art, remarkably improves the measurement efficiency of response measurement of the motor temperature monitoring system, and greatly reduces the size and the measurement cost of a measurement sample.
The invention provides a response measurement method of a motor temperature monitoring system, which comprises the steps of measuring the temperature of a coil winding by adopting a thermistor temperature sensor, outputting the measurement data of the thermistor temperature sensor through a temperature conversion circuit, measuring the actual temperature of a measurement point, close to the thermistor temperature sensor, on the coil winding by adopting a temperature measurement element, outputting the measurement data of the temperature measurement element through a data acquisition unit, establishing a time and temperature mapping relation curve of the thermistor temperature sensor by an upper computer according to the data output by the temperature conversion circuit, establishing a time and temperature mapping relation curve of the temperature measurement element according to the data output by the data acquisition unit by the upper computer, and fitting the time and temperature mapping relation curve of the thermistor temperature sensor by inputting an input value tau in a fitting equation by the upper computer, and outputting the input value tau when the fitting equation is used for fitting the time-temperature mapping relation curve of the thermistor temperature sensor to serve as the equivalent thermal response time constant of the thermistor temperature sensor. The measuring method solves the problems of overlarge measuring error and overlarge bench measurement in the prior art, obviously improves the measuring efficiency of response measurement of the motor temperature monitoring system, and greatly reduces the size and the measuring cost of a measuring sample.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the measuring method disclosed by the embodiment, as the adopted measuring system corresponds to the system part disclosed by the embodiment, the description of the measuring system involved in the measuring method is simpler, and the relevant points can be referred to the system part for description.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (15)
1. A response measurement system of a motor temperature monitoring system is characterized by comprising a coil winding, a thermistor temperature sensor, a temperature measuring element, a heat source and a processing unit;
the thermistor temperature sensor is used for measuring the temperature of the coil winding;
the temperature measuring element is used for measuring the temperature of a measuring point on the coil winding, which is close to the thermistor temperature sensor;
the heat source is used for heating the coil winding;
the processing unit is in communication connection with the thermistor temperature sensor and the temperature measuring element;
the processing unit is used for obtaining a response constant value tau of the motor temperature monitoring system according to the temperature data measured by the temperature measuring element and the measurement data of the thermistor temperature sensor.
2. The response measuring system of a motor temperature monitoring system according to claim 1, wherein said processing unit is further configured to convert the measurement data of said thermistor temperature sensor into temperature data of said thermistor temperature sensor, and obtain a time-to-temperature mapping curve L1 of said thermistor temperature sensor;
acquiring a mapping relation curve L2 of the time and the temperature of the temperature measuring element;
and the processing unit obtains a response constant value tau of the motor temperature monitoring system according to the L1 and the L2.
3. The response measurement system of the motor temperature monitoring system according to claim 2, wherein the processing unit includes a data collector, a temperature conversion circuit, and an upper computer;
the data collector is used for reading the temperature data measured by the temperature measuring element;
the temperature conversion circuit is used for acquiring the measurement data of the thermistor temperature sensor and converting the measurement data to obtain the temperature data of the thermistor temperature sensor;
the signal output end of the thermistor temperature sensor is connected to the input end of the temperature conversion circuit, and the output end of the temperature conversion circuit is in communication connection with the upper computer;
the signal input end of the data collector is connected to the temperature measuring element, and the signal output end of the data collector is in communication connection with the upper computer;
the upper computer is used for acquiring the L1;
obtaining the L2; and obtaining a response constant value tau of the motor temperature monitoring system according to the L1 and the L2.
4. The response measurement system of the motor temperature monitoring system of claim 3, wherein the tau is derived by a fitting equation:
Tsensor(t1)＝Tsensor(t0)+[Tactual(t1)-Tsensor(t0)]*(1-e(-[t1-t0]/tau))
wherein, t0And t1Is time, Tsensor(t1) Is t1Fitting temperature at time, Tsensor(t0) Is t0Fitting temperature at time, Tactual(t1) Is t1The temperature measured by the temperature measuring element at the moment.
5. The response measurement system of a motor temperature monitoring system of claim 1, wherein the temperature conversion circuit is a resistance-to-potential signal conversion circuit.
6. The response measurement system of the motor temperature monitoring system of claim 1, wherein the heating location of the coil winding is proximate to the measurement point of the thermistor temperature sensor.
7. The response measurement system of the motor temperature monitoring system of claim 1, wherein the temperature measuring element is a contact temperature measuring element or a non-contact temperature measuring element.
8. The response measurement system of the motor temperature monitoring system according to claim 7, wherein the contact temperature measurement element is a thermocouple and the non-contact temperature measurement element is an infrared thermometer.
9. The response measurement system of a motor temperature monitoring system of claim 1, further comprising a temperature sensor support, one end of the temperature sensor support being fixedly connected to the coil winding and the other end being connected to an input of the temperature sensor.
10. The response measurement system of the motor temperature monitoring system according to claim 9, wherein the temperature measuring element is a thermocouple, a portion of the coil winding connected to the temperature sensor bracket is provided with a groove, and the thermocouple is embedded in the groove;
or the temperature measuring element is an infrared thermometer, the infrared thermometer and the coil winding are arranged at intervals, and a detection area of the infrared thermometer covers the coil winding.
11. A response measurement method of a motor temperature monitoring system for temperature monitoring of a stator of the motor, comprising the steps of:
s1, heating the coil winding by adopting a heat source;
s2: measuring the temperature of the coil winding by adopting a thermistor temperature sensor, and outputting the measurement data of the thermistor temperature sensor through a temperature conversion circuit;
s3: measuring the actual temperature of a measuring point on the coil winding, which is close to the thermistor temperature sensor, by using a temperature measuring element, and outputting the measuring data of the temperature measuring element through a data acquisition unit;
s4: the upper computer establishes a time and temperature mapping relation curve of the thermistor temperature sensor according to data output by the temperature conversion circuit, and establishes a time and temperature mapping relation curve of the temperature measuring element according to data output by the data acquisition unit;
s5: the upper computer inputs an input value tau in a fitting equation to fit a time-temperature mapping relation curve of the thermistor temperature sensor, and outputs the input value tau when the fitting equation fits the time-temperature mapping relation curve of the thermistor temperature sensor as an equivalent thermal response time constant of the thermistor temperature sensor;
the fitting equation is:
Tsensor(t1)＝Tsensor(t0)+[Tactual(t1)-Tsensor(t0)]*(1-e(-[t1-t0]/tau))
wherein, t0And t1Is time, Tsensor(t1) Is t1Fitting temperature at time, Tsensor(t0) Is t0Fitting temperature at time, Tactual(t1) Is t1The temperature measured by the temperature measuring element at the moment.
12. The response measurement method of the motor temperature monitoring system according to claim 11, wherein the input value tau is input by a manual input or automatically generated by the upper computer.
13. The response measuring method of the motor temperature monitoring system according to claim 11, wherein the temperature measuring element is a thermocouple.
14. The response measurement method of the motor temperature monitoring system according to claim 11, wherein the S1 specifically includes:
immersing the coil winding into a high-temperature constant-temperature oil groove to heat the position, close to the thermistor temperature sensor, on the coil winding;
or connecting the lead wires of the same phase on the coil winding with the positive and negative electrodes of a low-voltage direct-current power supply respectively to heat the position, close to the thermistor temperature sensor, on the coil winding;
or a hot air generating device is arranged at a position close to the coil winding, and the position on the coil winding close to the thermistor temperature sensor is heated by the hot air generated by the hot air generating device.
15. The response measurement method of a motor temperature monitoring system according to claim 11, wherein the t is in the fitting equation0Time to the t1And in the time interval of the moment, the variation of the temperature data measured by the temperature measuring element is 100 ℃.
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