CN113884218A - Motor steady-state temperature rise prediction method, device and system and storage medium - Google Patents
Motor steady-state temperature rise prediction method, device and system and storage medium Download PDFInfo
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Abstract
The invention discloses a motor steady-state temperature rise prediction method, device, system and storage medium. The motor steady-state temperature rise prediction method comprises the following steps: sequentially acquiring the actually measured temperatures of the three stator windings when the motor operates in a stable load at equal time intervals; correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element; determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings; and determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor. By adopting the scheme, the effects of shortening the testing time and saving energy are realized.
Description
Technical Field
The embodiment of the invention relates to a temperature rise test technology, in particular to a motor steady-state temperature rise prediction method, device and system and a storage medium.
Background
The motor temperature rise test is an important index for judging whether the motor insulating material and the production process meet the requirements of normal work, research and development of the design life of the motor. In the actual temperature rise test process, the tested motor is often required to run from a cold state to a thermal stability working condition under a stable load, and although the motor has different cooling modes, the motor can be thermally stable within 90-120 min. This makes the motor waste a large amount of time in carrying out the temperature rise test at the research and development stage, and the electric energy is just test inefficiency.
Disclosure of Invention
The invention provides a motor steady-state temperature rise prediction method, a device, a system and a storage medium, which are used for achieving the effects of shortening the test time and saving energy.
In a first aspect, an embodiment of the present invention provides a method for predicting a steady-state temperature rise of a motor, where the method for predicting a steady-state temperature rise of a motor includes:
sequentially acquiring the actually measured temperatures of the three stator windings when the motor operates in a stable load at equal time intervals;
correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element;
determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings;
and determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
In an optional embodiment of the present invention, the obtaining measured temperatures of three stator windings of the motor running in a stable load sequentially at equal time intervals includes:
inputting a stable load working condition to the motor;
determining whether the motor is operating at a steady load;
if yes, the actually measured temperatures of the three stator windings are obtained in sequence at equal time intervals.
In an alternative embodiment of the present invention, the determining whether the motor operates at a stable load includes:
acquiring an actual torque value of a motor test bench;
determining whether a deviation of the set torque value from said actual torque value is less than or equal to ± 0.5% >. the set torque value.
In an alternative embodiment of the invention, the temperature sensing element types include thermocouples;
the correcting of the actually measured temperature of the three stator windings based on the type of the temperature measuring element comprises the following steps:
and correcting the actually measured temperatures of the three stator windings based on a thermocouple temperature correction formula:
the thermocouple temperature correction formula is as follows: TB1 ═ T1; TB2 ═ T2; TB3 ═ T3;
wherein T1, T2 and T3 are measured temperatures of the three stator windings respectively; TB1, TB2, and TB3 are corrected temperatures of T1, T2, and T3, respectively;
correspondingly, the determining the steady-state temperature of the motor based on the corrected measured temperatures of the three stator windings includes:
determining the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator windings;
the motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB3)；
where Tw is the motor steady-state temperature.
In an alternative embodiment of the present invention, the determining whether the motor operates after stabilizing the load includes:
if so, recording the cold temperature of the stator winding of the motor.
In an alternative embodiment of the invention, the temperature sensing element type comprises a thermal resistor;
the correcting of the actually measured temperature of the three stator windings based on the type of the temperature measuring element comprises the following steps:
correcting the actually measured temperatures of the three stator windings based on a thermal resistance temperature correction formula and the cold temperature of the motor stator winding:
the thermal resistance temperature correction formula is as follows: TB1 ═ T1+ (T1-T0) × 0.1; TB2 ═ T2+ (T2-T1) × 0.1; TB3 ═ T3+ (T3-T2) × 0.1;
wherein T0 is the cold temperature of the stator winding of the motor, T1, T2 and T3 are the actual measurement temperatures of the three stator windings respectively, and TB1, TB2 and TB3 are the corrected temperatures of T1, T2 and T3 respectively;
correspondingly, the determining the steady-state temperature of the motor based on the corrected measured temperatures of the three stator windings includes:
determining the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator windings;
the motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB3)；
where Tw is the motor steady-state temperature.
In an optional embodiment of the invention, the motor cooling manner comprises at least one of natural cooling, air cooling, water cooling and oil cooling;
determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor comprises the following steps:
and determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium.
In an optional embodiment of the invention, the determining the steady state temperature rise of the motor based on the steady state temperature of the motor and the ambient temperature or the temperature of the cooling medium comprises:
determining the steady-state temperature rise of the motor through a steady-state temperature rise formula based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium;
the steady-state temperature rise formula comprises delta T Tw-Th 1;
wherein: th1 is ambient temperature or temperature of cooling medium; the delta T is the steady-state temperature rise of the motor; tw is the motor steady-state temperature.
In a second aspect, an embodiment of the present invention further provides a device for predicting a steady-state temperature rise of a motor, where the device for predicting a steady-state temperature rise of a motor includes:
the acquisition module is used for sequentially acquiring the actually measured temperatures of the three stator windings when the motor operates in a stable load at equal time intervals;
the correction module is used for correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element;
the steady-state temperature determining module is used for determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings;
and the steady-state temperature rise determining module is used for determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
In a third aspect, an embodiment of the present invention further provides a system for predicting a steady-state temperature rise of a motor, where the system for predicting a steady-state temperature rise of a motor includes:
one or more processors;
storage means for storing one or more programs;
the temperature measuring element is used for measuring the temperature of the motor stator winding;
when executed by the one or more processors, cause the one or more processors to implement a method for predicting a steady state temperature rise of a motor according to any embodiment of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the method for predicting the steady-state temperature rise of the motor according to any embodiment of the present invention.
The measured temperatures of three stator windings when the motor runs in a stable load are sequentially obtained through the equal time intervals; then correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element; then determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings; and finally, determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor. The temperature rise value of the motor when the motor reaches the thermal stability working condition can be estimated only by sequentially acquiring the actual measurement temperature of the three stator windings of the motor running when the load is stabilized at equal time intervals, so that the accuracy of test data is guaranteed, the temperature rise test time is shortened, the test time is greatly shortened, energy is saved, and the effects of shortening the test time and saving energy are realized. Meanwhile, the three actually measured temperatures of the stator windings are corrected based on the type of the temperature measuring element, and then the steady-state temperature of the motor is determined based on the corrected three actually measured temperatures of the stator windings, so that the accuracy of the obtained steady-state temperature of the motor is improved, the obtained steady-state temperature rise of the motor is more accurate, and the accuracy of temperature rise prediction is improved.
Drawings
Fig. 1 is a flowchart of a method for predicting a steady-state temperature rise of a motor according to an embodiment of the present invention;
fig. 2 is a flowchart of a motor steady-state temperature rise prediction method according to a second embodiment of the present invention;
fig. 3 is a flowchart of a motor steady-state temperature rise prediction method according to a third embodiment of the present invention;
fig. 4 is a flowchart of a motor steady-state temperature rise prediction method according to a fourth embodiment of the present invention;
fig. 5 is a flowchart of a motor steady-state temperature rise prediction method according to a fifth embodiment of the present invention;
fig. 6 is a block flow diagram of a device for predicting steady-state temperature rise of a motor according to a sixth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a motor steady-state temperature rise prediction system according to a seventh embodiment of the present invention.
61, an acquisition module; 62. a correction module; 63. a steady state temperature determination module; 64. and a steady-state temperature rise determination module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a motor steady-state temperature rise prediction method according to an embodiment of the present invention, where the present embodiment is applicable to a motor temperature rise test situation, and the method may be executed by a motor steady-state temperature rise prediction system, and specifically includes the following steps:
s110, sequentially obtaining the actually measured temperatures of the three stator windings when the motor operates in a stable load at equal time intervals.
The method for acquiring the measured temperature of the stator winding during the operation of the motor is various, such as a thermometer method, an embedded thermometer method, a resistance method, and the like, and the manner of acquiring the temperature is not specifically limited herein. According to different specific requirements, the specific time values of the equal time intervals are correspondingly different. The three measured stator winding temperatures obtained in sequence at equal time intervals means that one measured stator winding temperature is obtained each time, and the time intervals of obtaining the measured stator winding temperatures twice are the same, so that the three measured stator winding temperatures are obtained.
For example, in one embodiment, the time interval of the equal time interval is 10min, when the motor operates under a stable load, the measured temperature of the first stator winding is obtained at an interval of 10min, then the measured temperature of the second stator winding is obtained at an interval of 10min, and finally the measured temperature of the third stator winding is obtained at an interval of 10 min.
And S120, correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element.
Wherein the temperatures measured by different temperature sensing elements may be different, e.g., the temperatures measured by some of the temperature sensing elements may lag. And correcting the measured temperatures of the three stator windings, namely compensating the measured temperatures of the three stator windings according to the temperature measurement defects of the temperature measurement element.
And S130, determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings.
The motor steady-state temperature refers to the temperature of a motor stator winding when the motor is in a thermal stability working condition. The three actually measured stator winding temperatures are corrected based on the type of the temperature measuring element, and then the motor steady-state temperature is determined based on the corrected three actually measured stator winding temperatures, so that the precision of the obtained motor steady-state temperature is improved.
And S140, determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
The motor steady-state temperature rise refers to a numerical value that the temperature of a motor stator winding is higher than the ambient temperature when the motor runs in a steady state. The motor cooling mode refers to a mode of cooling the motor after the temperature of the motor rises, and according to different use requirements, the motor cooling mode can comprise natural cooling, air cooling, water cooling, oil cooling and the like.
Based on a large amount of test data accumulation, the change rule of the temperature of the running stator of the motor under the stable load can be expressed by the following functional relationship:
T＝Tw-(Tw-T0)*e-at。
wherein a is a normal number related to a test object, a test condition and a test environment, T0 is the cold state temperature of the motor stator, and Tw is the steady state temperature of the motor.
Based on the formula, the motor steady-state temperature can be obtained through reverse estimation through actually measured temperatures of the three stator windings, and then the motor steady-state temperature rise is obtained.
According to the scheme, the actually measured temperatures of the three stator windings when the motor operates at a stable load are sequentially obtained through equal time intervals; then correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element; then determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings; and finally, determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor. The temperature rise value of the motor when the motor reaches the thermal stability working condition can be estimated only by sequentially acquiring the actual measurement temperature of the three stator windings of the motor running when the load is stabilized at equal time intervals, so that the accuracy of test data is guaranteed, the temperature rise test time is shortened, the test time is greatly shortened, energy is saved, and the effects of shortening the test time and saving energy are realized. Meanwhile, the three actually measured temperatures of the stator windings are corrected based on the type of the temperature measuring element, and then the steady-state temperature of the motor is determined based on the corrected three actually measured temperatures of the stator windings, so that the accuracy of the obtained steady-state temperature of the motor is improved, the obtained steady-state temperature rise of the motor is more accurate, and the accuracy of temperature rise prediction is improved.
Example two
Fig. 2 is a flowchart of a method for predicting a steady-state temperature rise of a motor according to a second embodiment of the present invention, which is optimized based on the first embodiment. Optionally, the three stator winding actual measurement temperatures of motor operation when stabilizing load are obtained in proper order to the equal time span, include: inputting a stable load working condition to the motor; determining whether the motor is operating at a steady load; if yes, the actually measured temperatures of the three stator windings are obtained in sequence at equal time intervals.
As shown in fig. 2, the method specifically includes:
and S210, inputting a stable load working condition to the motor.
The input of the stable load working condition to the motor means that the running state of the motor is under the condition that the load of the motor is stable and unchanged.
And S220, determining whether the motor operates in a stable load.
There are various ways to determine whether the motor operates in a stable load, and the determination is not particularly limited herein.
Illustratively, in a specific embodiment, the determining whether the motor is operating at a steady load includes: acquiring an actual torque value of a motor test bench; determining whether a deviation of the set torque value from said actual torque value is less than or equal to ± 0.5% >. the set torque value.
The motor test bench is used for bearing the motor when the motor is subjected to temperature rise test. Torque is a specific moment that causes an object to rotate. The actual torque value refers to the current actual torque value of the motor test bench, and the set torque value refers to the torque value which is supposed to be possessed by the motor test bench when the motor runs in a stable load. When the deviation between the set torque value and the actual torque value is less than or equal to +/-0.5% of the set torque value, the deviation between the set torque value and the actual torque value is small, namely, the motor is supposed to operate at a stable load. Therefore, whether the motor operates in a stable load or not can be conveniently judged by determining whether the deviation between the set torque value and the actual torque value is less than or equal to +/-0.5 percent.
If yes, go to step S230.
And S230, sequentially acquiring the actually measured temperatures of the three stator windings at equal time intervals.
The three measured stator winding temperatures obtained in sequence at equal time intervals mean that one measured stator winding temperature is obtained each time, and the time intervals of obtaining the measured stator winding temperatures twice are the same, so that the three measured stator winding temperatures are obtained.
And S240, correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element.
And S250, determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings.
And S260, determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
EXAMPLE III
Fig. 3 is a flowchart of a method for predicting a steady-state temperature rise of a motor according to a third embodiment of the present invention, which is optimized based on the second embodiment. Optionally, the temperature measuring element type comprises a thermocouple; the correcting of the actually measured temperature of the three stator windings based on the type of the temperature measuring element comprises the following steps: and correcting the actually measured temperatures of the three stator windings based on a thermocouple temperature correction formula: the thermocouple temperature correction formula is as follows: TB1 ═ T1; TB2 ═ T2; TB3 ═ T3; wherein T1, T2 and T3 are measured temperatures of the three stator windings respectively; TB1, TB2, and TB3 are corrected temperatures of T1, T2, and T3, respectively; correspondingly, the determining the steady-state temperature of the motor based on the corrected measured temperatures of the three stator windings includes: determining the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator windings; the motor steady-state temperature formula specifically comprises: t isw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB 3); where Tw is the motor steady-state temperature.
As shown in fig. 3, the method specifically includes:
and S310, inputting a stable load working condition to the motor.
And S320, determining whether the motor operates in a stable load.
If yes, go to step S330.
S330, sequentially obtaining the actually measured temperatures of the three stator windings at equal time intervals.
S340, correcting the actually measured temperatures of the three stator windings based on a thermocouple temperature correction formula: the thermocouple temperature correction formula is as follows: TB1 ═ T1; TB2 ═ T2; TB3 ═ T3; wherein T1, T2 and T3 are measured temperatures of the three stator windings respectively; TB1, TB2, and TB3 are corrected temperatures of T1, T2, and T3, respectively.
The temperature is timely measured by the thermocouple without hysteresis, so that the measured temperature of the stator winding can be directly taken as the corrected temperature.
S350, determining the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator windings; the motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB3)；
where Tw is the motor steady-state temperature.
In this way, the change rule of the temperature of the stator of the motor running under a stable load can be expressed by the following functional relationship:
T＝Tw-(Tw-T0)*e-at(ii) a Wherein a is a normal number related to a test object, a test condition and a test environment, T0 is the cold state temperature of the motor stator, and Tw is the steady state temperature of the motor.
Based on the formula, the motor steady-state temperature formula can be obtained through reverse deduction through the three actually measured stator winding temperatures T1, T2 and T3, and the motor steady-state temperature can be conveniently obtained according to the three actually measured stator winding temperatures T1, T2 and T3 through the motor steady-state temperature formula. By utilizing the accurate measurement value of the short-time temperature in the motor temperature rise test and combining a specific function relation, the temperature rise value of the motor under the thermal stability working condition can be predicted, the efficiency of the motor stator winding steady-state temperature rise test is improved, the time cost and the power consumption cost of the test are reduced, and the utilization rate of the motor test bench is improved.
And S360, determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
Example four
Fig. 4 is a flowchart of a method for predicting a steady-state temperature rise of a motor according to a fourth embodiment of the present invention, which is optimized based on the second embodiment. Optionally, the determining whether the motor operates after stabilizing the load includes: if so, recording the cold temperature of the stator winding of the motor. Optionally, the temperature measuring element type includes a thermal resistor; the correcting of the actually measured temperature of the three stator windings based on the type of the temperature measuring element comprises the following steps: correcting the actually measured temperatures of the three stator windings based on a thermal resistance temperature correction formula and the cold temperature of the motor stator winding: the thermal resistance temperature correction formula is as follows: TB1 ═ T1+ (T1-T0) × 0.1; TB2 ═ T2+ (T2-T1) × 0.1; TB3 ═ T3+ (T3-T2) × 0.1; wherein T0 is the cold temperature of the stator winding of the motor, T1, T2 and T3 are the actual measurement temperatures of the three stator windings respectively, and TB1, TB2 and TB3 are the corrected temperatures of T1, T2 and T3 respectively; correspondingly, the determining the steady-state temperature of the motor based on the corrected measured temperatures of the three stator windings includes: determining the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator windings; the motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB3)；
where Tw is the motor steady-state temperature.
As shown in fig. 4, the method specifically includes:
and S410, inputting a stable load working condition to the motor.
And S420, determining whether the motor operates in a stable load.
If yes, steps S430 and S440 are performed.
And S430, sequentially acquiring the actually measured temperatures of the three stator windings at equal time intervals.
And S440, recording the cold temperature of the stator winding of the motor.
S450, correcting the actually measured temperatures of the three stator windings based on a thermal resistance temperature correction formula and the cold state temperature of the motor stator windings: the thermal resistance temperature correction formula is as follows: TB1 ═ T1+ (T1-T0) × 0.1; TB2 ═ T2+ (T2-T1) × 0.1; TB3 ═ T3+ (T3-T2) × 0.1; wherein T0 is the cold state temperature of the stator winding of the motor, T1, T2 and T3 are the measured temperatures of the three stator windings respectively, and TB1, TB2 and TB3 are the corrected temperatures of T1, T2 and T3 respectively.
Because the temperature has hysteresis when adopting thermal resistance temperature measurement, compensate the temperature through above-mentioned thermal resistance temperature correction formula, can make the temperature after the correction more be close to actual temperature, improved temperature accuracy.
S460, determining the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator windings; the motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)//(2TB2-TB1-TB3)；
where Tw is the motor steady-state temperature.
The motor steady-state temperature is determined based on the corrected three stator winding actual measurement temperatures, so that the accuracy of the obtained motor steady-state temperature is improved, the obtained motor steady-state temperature rise is accurate, and the accuracy of temperature rise prediction is improved.
And S470, determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
EXAMPLE five
Fig. 5 is a flowchart of a method for predicting a steady-state temperature rise of a motor according to a fifth embodiment of the present invention, and the embodiment of the present invention is optimized based on the fourth embodiment. Optionally, the motor cooling mode includes at least one of natural cooling, air cooling, water cooling and oil cooling; determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor comprises the following steps: and determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium.
As shown in fig. 5, the method specifically includes:
and S510, inputting a stable load working condition to the motor.
And S520, determining whether the motor operates in a stable load.
If yes, steps S530 and S540 are performed.
And S530, sequentially acquiring the actually measured temperatures of the three stator windings at equal time intervals.
And S540, recording the cold temperature of the stator winding of the motor.
S550, correcting the actually measured temperatures of the three stator windings based on a thermal resistance temperature correction formula and the cold state temperature of the motor stator windings: the thermal resistance temperature correction formula is as follows: TB1 ═ T1+ (T1-T0) × 0.1; TB2 ═ T2+ (T2-T1) × 0.1; TB3 ═ T3+ (T3-T2) × 0.1; wherein T0 is the cold state temperature of the stator winding of the motor, T1, T2 and T3 are the measured temperatures of the three stator windings respectively, and TB1, TB2 and TB3 are the corrected temperatures of T1, T2 and T3 respectively.
S560, determining the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator windings; the motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)//(2TB2-TB1-TB3)；
where Tw is the motor steady-state temperature.
And S570, determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium.
The cooling medium is a medium for cooling the motor. Such as water when water is cooled and oil when oil is cooled. Because the method is a method for predicting the steady-state temperature rise of the motor in a short time, the environmental stability of the motor after thermal stability cannot be accurately obtained. Therefore, the steady-state temperature rise of the motor can be determined by the ambient temperature or the temperature of the cooling medium for different cooling modes. For example, the motor cooling means includes at least one of natural cooling, air cooling, water cooling, and oil cooling. The steady-state temperature rise of the motor can be determined through the ambient temperature during natural cooling, and the steady-state temperature rise of the motor can be determined through the cooling medium during water cooling.
In addition, the time for obtaining the ambient temperature or the temperature of the cooling medium can be obtained when the actually measured temperature of the stator winding is obtained for the last time, that is, if T1, T2 and T3 are obtained in sequence along the time, the ambient temperature or the temperature of the cooling medium can be obtained at the time of T3, and then the steady-state temperature rise of the motor is determined based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium, so that the obtained steady-state temperature rise of the motor is relatively accurate.
For example, the determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium includes: determining the steady-state temperature rise of the motor through a steady-state temperature rise formula based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium; the steady state temperature rise formula includes: Δ T-Tw-Th 1; wherein: th1 is ambient temperature or temperature of cooling medium; the delta T is the steady-state temperature rise of the motor; tw is the motor steady-state temperature.
Through the formula, the stable temperature rise of the motor can be conveniently obtained.
EXAMPLE six
The sixth embodiment of the invention provides comparison conditions before and after data correction of different test prototypes, and the motor steady-state temperature predicted value after correction mentioned in the first table is the predicted value according to the formula T in the previous stepw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB3) to obtain the motor steady-state temperature Tw.
As can be seen from table one, after the three actually measured stator winding temperatures T1, T2 and T3 are corrected by different types of test prototypes to obtain TB1, TB2 and TB3, compared with the actually-measured motor steady-state temperature predicted values, the steady-state temperature difference obtained by the actual test is reduced, and the corrected deviation is greatly smaller than the uncorrected deviation, which indicates that the three actually-measured stator winding temperatures T1, T2 and T3 are corrected according to the method, so that the accuracy of the obtained motor steady-state temperature is effectively improved.
Watch 1
EXAMPLE seven
The seventh embodiment of the present invention further provides a device for predicting a steady-state temperature rise of a motor, and fig. 6 is a block diagram of a process of the device for predicting a steady-state temperature rise of a motor according to the seventh embodiment of the present invention. The motor steady-state temperature rise prediction device provided by the embodiment of the invention can execute the motor steady-state temperature rise prediction method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. As shown in fig. 6, the device for predicting the steady-state temperature rise of the motor may specifically include the following modules:
and the acquisition module 61 is used for sequentially acquiring the actually measured temperatures of the three stator windings when the motor operates in a stable load at equal time intervals.
The correction module 62 is used for correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element;
and the steady-state temperature determining module 63 is used for determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings.
And a steady-state temperature rise determination module 64 for determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
In an alternative embodiment of the present invention, the obtaining module 61 further includes an input submodule, a determining submodule, and a obtaining submodule.
And the input submodule is used for inputting a stable load working condition to the motor.
A determination submodule for determining whether the electric machine is operating at a steady load.
And the obtaining submodule is used for sequentially obtaining the actually measured temperatures of the three stator windings at equal time intervals if the actual measured temperatures of the three stator windings are the same.
In an alternative embodiment of the present invention, the determination submodule includes an acquisition unit and a determination unit.
And the acquisition unit is used for acquiring the actual torque value of the motor test bench.
A determination unit for determining whether a deviation of a set torque value from said actual torque value is less than or equal to ± 1% of the set torque value.
In an alternative embodiment of the invention, the temperature sensing element type comprises a thermocouple.
And the correction module 62 is further configured to correct the measured temperatures of the three stator windings based on a thermocouple temperature correction formula.
The thermocouple temperature correction formula is as follows: TB1 ═ T1; TB2 ═ T2; TB3 ═ T3.
Wherein T1, T2 and T3 are measured temperatures of the three stator windings respectively; TB1, TB2, and TB3 are corrected temperatures of T1, T2, and T3, respectively.
And the steady-state temperature determining module 63 is further configured to determine the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator winding.
The motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB3)。
where Tw is the motor steady-state temperature.
In an optional embodiment of the present invention, the device for predicting steady-state temperature rise of a motor further includes a recording module.
And the recording module is used for recording the cold temperature of the stator winding of the motor if the motor runs in a stable load.
In an alternative embodiment of the invention, the temperature sensing element type comprises a thermal resistor.
And the correcting module 62 is further configured to correct the measured temperatures of the three stator windings based on a thermal resistance temperature correction formula.
The thermal resistance temperature correction formula is as follows: TB1 ═ T1+ (T1-T0) × 0.1; TB2 ═ T2+ (T2-T1) × 0.1; TB3 ═ T3+ (T3-T2) × 0.1.
Wherein T0 is the cold temperature of the stator winding of the motor, T1, T2 and T3 are the actual measurement temperatures of the three stator windings respectively, and TB1, TB2 and TB3 are the corrected temperatures of T1, T2 and T3 respectively;
and the steady-state temperature determining module 63 is further configured to determine the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator winding and the cold-state temperature of the stator winding of the motor.
The motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB3)。
where Tw is the motor steady-state temperature.
In an alternative embodiment of the present invention, the motor cooling manner includes at least one of natural cooling, air cooling, water cooling, and oil cooling.
The steady-state temperature rise determination module 64 is further configured to determine the steady-state temperature rise of the motor according to a steady-state temperature rise formula based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium.
The steady state temperature rise formula includes: Δ T-Tw-Th 1.
Wherein: th1 is ambient temperature or temperature of cooling medium; the delta T is the steady-state temperature rise of the motor; tw is the motor steady-state temperature.
It should be noted that: in the above embodiment, when the temperature is preset, the motor steady-state temperature rise prediction apparatus is exemplified by only the division of the functional modules, and in practical application, the function distribution may be completed by different functional modules according to needs, that is, the internal structure of the motor steady-state temperature rise prediction apparatus is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the motor steady-state temperature rise prediction device and the motor steady-state temperature rise prediction method provided by the embodiment belong to the same concept, and specific implementation processes are detailed in the method embodiment and are not described again.
Example eight
Fig. 7 is a schematic structural diagram of a steady-state temperature rise prediction system of a motor according to an eighth embodiment of the present invention, as shown in fig. 7, the steady-state temperature rise prediction system of the motor includes a processor 70, a memory 71, an input device 72, an output device 73, and a temperature measuring element 74; the number of the processors 70 in the motor steady-state temperature rise prediction system can be one or more, and one processor 70 is taken as an example in fig. 7; the processor 70, the memory 71, the input device 72, the output device 73 and the temperature measuring element 74 in the motor steady state temperature rise prediction system can be connected by a bus or other means, and the bus connection is taken as an example in fig. 7.
The memory 71 is a computer readable storage medium, and can be used for storing software programs, computer executable programs, and modules, such as program instructions/modules corresponding to the motor steady-state temperature rise prediction method in the embodiment of the present invention (for example, the obtaining module 61, the correcting module 62, the steady-state temperature determining module 63, and the steady-state temperature rise determining module 64 in the motor steady-state temperature rise prediction apparatus). The processor 70 executes various functional applications and data processing of the motor steady-state temperature rise prediction system by running software programs, instructions and modules stored in the memory 71, that is, the motor steady-state temperature rise prediction method is realized.
The memory 71 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 71 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 71 may further include a memory remotely located from the processor 70, and these remote memories may be connected to the motor steady state temperature rise prediction system via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 72 may be used to receive entered numerical or character information and generate key signal inputs relating to user settings and function control of the motor steady state temperature rise prediction system. The output device 73 may include a display device such as a display screen. The temperature sensing element 74 may be a thermal resistor, thermocouple, or the like.
Example nine
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, where the computer-executable instructions are executed by a computer processor to perform a method for predicting a steady-state temperature rise of a motor, and the method includes:
sequentially acquiring the actually measured temperatures of the three stator windings when the motor operates in a stable load at equal time intervals;
correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element;
determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings;
and determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the method for predicting the steady-state temperature rise of the motor provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the device for predicting the steady-state temperature rise of the motor, each unit and each module included in the device are only divided according to functional logic, but are not limited to the above division, as long as the corresponding function can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (11)
1. A motor steady-state temperature rise prediction method is characterized by comprising the following steps:
sequentially acquiring the actually measured temperatures of the three stator windings when the motor operates in a stable load at equal time intervals;
correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element;
determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings;
and determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
2. The motor steady-state temperature rise prediction method according to claim 1, wherein the step of sequentially obtaining the measured temperatures of three stator windings of the motor running under a stable load at equal time intervals comprises the steps of:
inputting a stable load working condition to the motor;
determining whether the motor is operating at a steady load;
if yes, the actually measured temperatures of the three stator windings are obtained in sequence at equal time intervals.
3. The method of predicting steady state temperature rise of an electric motor according to claim 2, wherein said determining whether said electric motor is operating at a steady load comprises:
acquiring an actual torque value of a motor test bench;
determining whether a deviation of the set torque value from said actual torque value is less than or equal to ± 0.5% >. the set torque value.
4. The motor steady state temperature rise prediction method of claim 1, wherein the temperature sensing element type comprises a thermocouple;
the correcting of the actually measured temperature of the three stator windings based on the type of the temperature measuring element comprises the following steps:
and correcting the actually measured temperatures of the three stator windings based on a thermocouple temperature correction formula:
the thermocouple temperature correction formula is as follows: TB1 ═ T1; TB2 ═ T2; TB3 ═ T3;
wherein T1, T2 and T3 are measured temperatures of the three stator windings respectively; TB1, TB2, and TB3 are corrected temperatures of T1, T2, and T3, respectively;
correspondingly, the determining the steady-state temperature of the motor based on the corrected measured temperatures of the three stator windings includes:
determining the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator windings;
the motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB3)；
where Tw is the motor steady-state temperature.
5. The motor steady-state temperature rise prediction method according to claim 2 or 3, wherein the determining whether the motor is operating after a steady load comprises:
if so, recording the cold temperature of the stator winding of the motor.
6. The method of claim 5, wherein the temperature sensing element type comprises a thermal resistor;
the correcting of the actually measured temperature of the three stator windings based on the type of the temperature measuring element comprises the following steps:
correcting the actually measured temperatures of the three stator windings based on a thermal resistance temperature correction formula and the cold temperature of the motor stator winding:
the thermal resistance temperature correction formula is as follows: TB1 ═ T1+ (T1-T0) × 0.1; TB2 ═ T2+ (T2-T1) × 0.1; TB3 ═ T3+ (T3-T2) × 0.1;
wherein T0 is the cold temperature of the stator winding of the motor, T1, T2 and T3 are the actual measurement temperatures of the three stator windings respectively, and TB1, TB2 and TB3 are the corrected temperatures of T1, T2 and T3 respectively;
correspondingly, the determining the steady-state temperature of the motor based on the corrected measured temperatures of the three stator windings includes:
determining the steady-state temperature of the motor through a motor steady-state temperature formula based on the corrected three measured temperatures of the stator windings;
the motor steady-state temperature formula specifically comprises:
Tw＝TB1+(TB2-TB1)2/(2TB2-TB1-TB3)＝(TB22-TB1TB3)/(2TB2-TB1-TB3)；
where Tw is the motor steady-state temperature.
7. The motor steady-state temperature rise prediction method according to any one of claims 1 to 4, wherein the motor cooling manner comprises at least one of natural cooling, air cooling, water cooling and oil cooling;
determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor comprises the following steps:
and determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium.
8. The method of claim 7, wherein determining the steady state temperature rise of the motor based on the steady state temperature of the motor and the ambient temperature or the temperature of the cooling medium comprises:
determining the steady-state temperature rise of the motor through a steady-state temperature rise formula based on the steady-state temperature of the motor and the ambient temperature or the temperature of the cooling medium;
the steady state temperature rise formula includes: Δ T-Tw-Th 1;
wherein: th1 is ambient temperature or temperature of cooling medium; the delta T is the steady-state temperature rise of the motor; tw is the motor steady-state temperature.
9. A motor steady-state temperature rise prediction device, comprising:
the acquisition module is used for sequentially acquiring the actually measured temperatures of the three stator windings when the motor operates in a stable load at equal time intervals;
the correction module is used for correcting the actually measured temperatures of the three stator windings based on the type of the temperature measuring element;
the steady-state temperature determining module is used for determining the steady-state temperature of the motor based on the corrected actually measured temperatures of the three stator windings;
and the steady-state temperature rise determining module is used for determining the steady-state temperature rise of the motor based on the steady-state temperature of the motor and the cooling mode of the motor.
10. A motor steady state temperature rise prediction system, comprising:
one or more processors;
storage means for storing one or more programs;
the temperature measuring element is used for measuring the temperature of the motor stator winding;
when executed by the one or more processors, cause the one or more processors to implement a motor steady state temperature rise prediction method as recited in any of claims 1-8.
11. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out a method for predicting the steady-state temperature rise of an electric motor according to any one of claims 1 to 8.
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