CN104215906A - Method for testing motor efficiency based on automatic control - Google Patents
Method for testing motor efficiency based on automatic control Download PDFInfo
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Abstract
The invention provides a method for testing motor efficiency based on automatic control. According to the requirements of Three-Phase Asynchronous Motor Test Method GB1032, various output parameters such as voltage, current, frequency and output power of a load power source and a variable-frequency power source are automatically adjusted so that the purpose of automatically controlling various output parameters can be achieved in the test processes such as a motor hot test, a no-load test, a toque modification link and a load test; as a result, the operations are simple and convenient, the data accuracy is high, and the repeatability, the security and stability and the like can be improved.
Description
Technical field
The present invention relates to a kind of test method, being specifically related to a kind of test method of the motor efficiency test based on automatically controlling.
Background technology
Widely using of motor product, has greatly promoted the progress of human society, has facilitated the life of people; But also consumes a large amount of energy simultaneously, seriously pollute environment.According to investigations, 70% of industrial enterprise's electric power final use consumed by motor (living load).So in order to protection of the environment, economize energy with increase economic efficiency, various countries take measures one after another, to improve the efficiency of motor.Efficiently the concept of (energy-conservation) motor is just arisen at the historic moment, and standardization effort is also progressively carried out.Electric efficiency is higher, and the difficulty of raising is larger, and the efficiency value improved by technological improvement is also less.Therefore, should adopt when measuring high efficiency motor the method for testing that precision comparison is high.
According to GB1032 " threephase asynchronous test method " requirement, in motor efficiency testing experiment, be divided into the tests such as the resistance measurement of cold conditions end, heat test, load test, torque modification link, no-load test, at control output, mainly export with forms such as voltage, electric current, power, frequency, torque, rotating speeds, this part test figure is extremely important to indexs such as motor efficiency performances.In motor efficiency testing experiment in the past, automaticity is lower, control based on Manual test, the modes such as general employing manual adjustments voltage, electric current, power are tested, by simulation table and digital watch, the various parameters in motor experiment process are measured and record, transfer data to industrial computer by communication module, thus carry out calculating, the operation such as curve, complete efficiency test.But this research technique exist in process of the test operation more loaded down with trivial details, easily cause the technical barriers such as maloperation, data error is large, randomness is strong.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of test method of the motor efficiency test based on automatically controlling, according to GB1032 " threephase asynchronous test method " requirement, by the various output parameters of automatic regulating load power supply and variable-frequency power sources, comprise voltage, electric current, frequency, output power etc., test at motor heating, no-load test, torque modification link, in the processs of the test such as load test, realize the object automatically controlled, simple to operation like this, data accuracy is high, the everyways such as repeatability and security and stability increase.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides a kind of test method of the motor efficiency test based on automatically controlling, said method comprising the steps of:
Step 1: carry out motor heating test under motor nominal load;
Step 2: carry out motor load test on the basis of heat test;
Step 3: carry out torque modification under motor rated voltage and rated frequency;
Step 4: carry out motor no-load test.
Described step 1 specifically comprises the following steps:
Step 1-1: by specified operational factors such as the industrial computer setting rated voltage of motor, rated frequency and output ratings, and issue control command to load power source and variable-frequency power sources, load power source and variable-frequency power sources output to motor experiment stage body according to the specified operational factor of motor, and keep running;
Step 1-2: along with the operation of motor, the actual operation parameters such as virtual voltage, real output, actual frequency of measurement instrument moment feedback motor, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual operation parameters of motor is not in testing requirements setting value allowed band, industrial computer issues control command to load power source and variable-frequency power sources by setting value, load power source and variable-frequency power sources regulate current operating state, until motor running to rated operation, regulate and terminate; If the actual operation parameters of motor changes again, then continue in the manner described above to regulate;
Step 1-3: industrial computer collects the actual operation parameters of motor, contrasts with testing requirements setting value, if actual operation parameters is in testing requirements setting value allowed band, then records a corresponding service data of motor by industrial computer every 30min; If do not meet, then wait for and be adjusted to the laggard line item of rated operation.
Described step 2 specifically comprises the following steps:
Step 2-1: when the temperature difference that stator winding temperature and nominal load heat test record is within 5K, according to testing requirements, by the output power of rated voltage, rated frequency and first POL in the load test of industrial computer setting motor, industrial computer issues control order automatically to load power source and variable-frequency power sources;
Step 2-2: load power source and variable-frequency power sources output rated voltage, the output power of rated frequency and first POL is to motor stage body, the virtual voltage of measurement instrument moment feedback motor, actual frequency, the actual operation parameters such as real output, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual operation parameters of motor is not in testing requirements setting value allowed band, then issue control command to load power source and variable-frequency power sources by testing requirements setting value, load power source and variable-frequency power sources regulate current operating state, until motor running is in rated voltage, under rated frequency, and in the output power range of first POL till stable operation, regulate and terminate,
Step 2-3: industrial computer collects the actual operation parameters of motor, contrast with the output power of rated voltage, rated frequency and first POL in load test, if actual operation parameters is in testing requirements setting value allowed band, then record the corresponding service data of motor, if do not meet, then wait for and be adjusted to first laggard line item of POL steady operational status;
Step 2-4: after the actual operating data record of motor is complete, under motor is operated in rated voltage and rated frequency, by the output power of second POL in industrial computer setting load test, and regulated by load power source and variable-frequency power sources, and operate by above-mentioned process of the test, complete the test of each POL by that analogy.
Described step 3 specifically comprises the following steps:
Step 3-1: by rated voltage and the rated frequency of industrial computer setting motor, industrial computer issues control order automatically to variable-frequency power sources, and variable-frequency power sources exports to motor stage body, runs under being adjusted to rated voltage and rated frequency;
Step 3-2: the actual operation parameters such as virtual voltage, actual frequency, actual power input of measurement instrument moment feedback motor, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual operation parameters of motor is not in testing requirements setting value allowed band, then issue control command to variable-frequency power sources according to testing requirements setting value, variable-frequency power sources regulates current operating state, until motor running is under rated frequency and rated voltage, regulates and terminate;
Step 3-3: industrial computer collects the actual operation parameters of motor, contrasts with testing requirements setting value, if actual operation parameters is in testing requirements setting value allowed band, then records the corresponding service data of motor; If do not meet, then wait for and be adjusted to the laggard line item of specified running status.
Described step 4 specifically comprises the following steps:
Step 4-1: motor and load are thrown off, by industrial computer record power input, after the difference of two readings in succession meeting 30min power input of being separated by is not more than the condition of 3% of previous reading, according to testing requirements, carry out no-load test, by industrial computer setting motor rated frequency and required first the testing site voltage of motor no-load test, industrial computer issues control order regulates rated frequency and first testing site voltage to variable-frequency power sources automatically;
Step 4-2: variable-frequency power sources sets according to testing requirements, export the voltage of rated frequency and first testing site to motor stage body, the virtual voltage of measurement instrument moment feedback motor, actual current, the actual operation parameters such as actual power input, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual working state of motor is not in testing requirements setting value allowed band, then issue control command to variable-frequency power sources according to testing requirements setting value, variable-frequency power sources regulates current operating state, run until motor can meet with rated frequency, till voltage is first testing site state of no-load test requirement, regulate and terminate,
Step 4-3: industrial computer collects motor running parameter, and contrast with testing requirements setting value, if actual operation parameters is in testing requirements setting value allowed band, then record the corresponding service data of motor; If do not meet, then wait for motor be adjusted to rated frequency under and carry out record by first testing site voltage range of no-load test requirement;
Step 4-4: after data record is complete, by the operational factor of second testing site of industrial computer setting no-load test, and operates by above-mentioned process of the test, completes the test of each testing site in no-load test by that analogy.
Compared with prior art, beneficial effect of the present invention is:
1. the present invention passes through the various output parameters of industrial computer automatic regulating load power supply and variable-frequency power sources, realize the object automatically controlling each output parameter, for testing requirements, to controls that automatically adjusts such as heat test, load test, torque modification link, no-load tests, easily easy to operate, solve the operation that Manual test method traditional at present brings loaded down with trivial details, easily cause maloperation problem, improve security and stability and the operability of test;
2. the present invention is directed to testing requirements, in the processs of the test such as heat test, load test, torque modification link, no-load test, by the auto-adjustment control that industrial computer is precise and stable, solve the problems such as the data error that Manual test method traditional at present brings is large, data are unstable, improve the accuracy of data, reach the object accurately controlled, ensure that the high precision of test figure, finally ensure that the accuracy of efficiency calculation;
3. solve the problems such as randomness that Manual test method traditional at present brings is strong, automatic control and adjustment load power source and each output parameter of variable-frequency power sources is realized by industrial computer by the present invention, can according to testing requirements, setting range of adjustment, and data are recorded under testing requirements condition, decrease the randomness tested and bring within the specific limits, avoid the record of invalid test figure and the adjustment of test and data record and synchronously can not wait shortcoming, improve the repeatability of test, ensure that test stability;
4. the present invention is according to testing requirements, and by precise and stable regulating and controlling, ensure that the precise and stable of the data in each test needed for efficiency, the efficiency value calculated is more reliable, objective, improves the test method to high efficiency motor efficiency test.
Accompanying drawing explanation
Fig. 1 is the test method schematic diagram based on the motor efficiency test automatically controlled.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention is based on the flourish of current converter technology and proven technique, according in GB1032 " threephase asynchronous test method " to the requirement of motor efficiency testing experiment, pass through industrial computer, respectively in heat test, load test, torque modification link, in the processs of the test such as no-load test, to the voltage of load power source and variable-frequency power sources, electric current, the parameters such as power automatically adjust and realize automatically controlling to export object, easy to operate like this, improve the safety and stability of test, improve the accuracy of data in each process of the test, thus raise the efficiency the accuracy of calculating, repeatable high.
According in GB1032 " threephase asynchronous test method " to the requirement of motor efficiency testing experiment, in conjunction with the technical scheme in the present invention, require that converter power supply hardware supported computer software controls, voltage-regulation amplitude should be accurate to 0.1V as much as possible, frequency adjustment amplitude should be accurate to 0.01Hz as much as possible, and load power source supports that computer software controls.
According to GB1032 " threephase asynchronous test method " requirement, the test method based on the motor efficiency test automatically controlled comprises heat test, load test, torque modification link, no-load test.
As Fig. 1, the invention provides a kind of test method of the motor efficiency test based on automatically controlling, said method comprising the steps of:
Step 1: carry out motor heating test under motor nominal load;
Step 2: carry out motor load test on the basis of heat test;
Step 3: carry out torque modification under motor rated voltage and rated frequency;
Step 4: carry out motor no-load test.
(1) heat test
In actual heat test process in the past, motor stable operation is under rated condition, but along with the carrying out of test, the voltage, electric current, output power, frequency etc. of motor all can produce moderate fluctuation change, even can not meet the testing requirements of motor stable operation under rated condition sometimes, the secondary data thereupon recorded every 30min, can not ensure the accuracy of data.Need to observe the parameter states such as motor voltage, electric current, output power, frequency at any time, the parameters such as manual adjustments voltage, output power record, have impact on the accuracy of efficiency calculation data significantly.
By output parameters such as the automatic regulating load output power of industrial computer and variable-frequency power sources voltage, electric current, frequencies, and automatically record test figure by testing requirements, can the effectively stability of motor rated condition and the accuracy of data record in warranty test process, step 1 specifically comprises the following steps:
Step 1-1: by specified operational factors such as the industrial computer setting rated voltage of motor, rated frequency and output ratings, and issue control command to load power source and variable-frequency power sources, load power source and variable-frequency power sources output to motor experiment stage body according to the specified operational factor of motor, and keep running;
Step 1-2: along with the operation of motor, the actual operation parameters such as virtual voltage, real output, actual frequency of measurement instrument moment feedback motor, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual operation parameters of motor is not in testing requirements setting value allowed band, industrial computer issues control command to load power source and variable-frequency power sources by setting value, load power source and variable-frequency power sources regulate current operating state, until motor running to rated operation, regulate and terminate; If the actual operation parameters of motor changes again, then continue in the manner described above to regulate;
Step 1-3: industrial computer collects the actual operation parameters of motor, contrasts with testing requirements setting value, if actual operation parameters is in testing requirements setting value allowed band, then records a corresponding service data of motor by industrial computer every 30min; If do not meet, then wait for and be adjusted to the laggard line item of rated operation.
(2) load test
In load test, by testing requirements should be fast as far as possible complete test, to reduce the impact of the change of motor temperature in process of the test on test findings.But in the load test of reality, along with the adjustment of load, motor actual motion voltage, output power can change thereupon, in each POL range of adjustment, regulate in a manual manner, be difficult to voltage and output power are satisfied condition simultaneously, if regulating time is long, then can increase the impact of motor temperature change on test findings in process of the test.
By the automatic regulating load output power of industrial computer and variable-frequency power sources output parameter, automatically test figure is recorded according to testing requirements at each POL, the impact of motor temperature change on test findings in process of the test can be reduced, the stability of more effective warranty test process and the accuracy of data record, specifically comprise the following steps:
Step 2-1: when the temperature difference that stator winding temperature and nominal load heat test record is within 5K, according to testing requirements, by the output power of rated voltage, rated frequency and first POL in the load test of industrial computer setting motor, industrial computer issues control order automatically to load power source and variable-frequency power sources;
Step 2-2: load power source and variable-frequency power sources output rated voltage, the output power of rated frequency and first POL is to motor stage body, the virtual voltage of measurement instrument moment feedback motor, actual frequency, the actual operation parameters such as real output, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual operation parameters of motor is not in testing requirements setting value allowed band, then issue control command to load power source and variable-frequency power sources by testing requirements setting value, load power source and variable-frequency power sources regulate current operating state, until motor running is in rated voltage, under rated frequency, and in the output power range of first POL till stable operation, regulate and terminate,
Step 2-3: industrial computer collects the actual operation parameters of motor, contrast with the output power of rated voltage, rated frequency and first POL in load test, if actual operation parameters is in testing requirements setting value allowed band, then record the corresponding service data of motor, if do not meet, then wait for and be adjusted to first laggard line item of POL steady operational status;
Step 2-4: after the actual operating data record of motor is complete, under motor is operated in rated voltage and rated frequency, by the output power of second POL in industrial computer setting load test, and regulated by load power source and variable-frequency power sources, and operate by above-mentioned process of the test, complete the test of each POL by that analogy.
(3) torque modification
Torque modification link, needs tested motor to run under rated voltage and rated frequency, measures and records power input, stator current, rotating speed, torque, winding temperature, frequency etc.In actual tests process, process of the test is more loaded down with trivial details, needs manual adjustments, and test error is larger.
Automatically regulate variable-frequency power sources output parameter by industrial computer, and automatically record test figure by testing requirements, can the effectively stability of motor and the accuracy of data record in warranty test process, specifically comprise the following steps:
Step 3-1: by rated voltage and the rated frequency of industrial computer setting motor, industrial computer issues control order automatically to variable-frequency power sources, and variable-frequency power sources exports to motor stage body, runs under being adjusted to rated voltage and rated frequency;
Step 3-2: the actual operation parameters such as virtual voltage, actual frequency, actual power input of measurement instrument moment feedback motor, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual operation parameters of motor is not in testing requirements setting value allowed band, then issue control command to variable-frequency power sources according to testing requirements setting value, variable-frequency power sources regulates current operating state, until motor running is under rated frequency and rated voltage, regulates and terminate;
Step 3-3: industrial computer collects the actual operation parameters of motor, contrasts with testing requirements setting value, if actual operation parameters is in testing requirements setting value allowed band, then records the corresponding service data of motor; If do not meet, then wait for and be adjusted to the laggard line item of specified running status.
(4) no-load test
Before actual no-load test, the difference being difficult to two readings in succession meeting 30min power input of being separated by is not more than 3% of previous reading, when actual no-load test, variable voltage motor being imposed to rated frequency is difficult to regulate accurately and timely record, test is main with manual operation, operation is more loaded down with trivial details, and the error caused also increases thereupon.
Automatically frequency converter output parameter is regulated by industrial computer, and automatically record test figure by testing requirements, can the effectively stability of motor running and the accuracy of data record in warranty test process, and the flatness that no-load curve is drawn, specifically comprise the following steps:
Step 4-1: motor and load are thrown off, by industrial computer record power input, after the difference of two readings in succession meeting 30min power input of being separated by is not more than the condition of 3% of previous reading, according to testing requirements, carry out no-load test, by industrial computer setting motor rated frequency and required first the testing site voltage of motor no-load test, industrial computer issues control order regulates rated frequency and first testing site voltage to variable-frequency power sources automatically;
Step 4-2: variable-frequency power sources sets according to testing requirements, export the voltage of rated frequency and first testing site to motor stage body, the virtual voltage of measurement instrument moment feedback motor, actual current, the actual operation parameters such as actual power input, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual working state of motor is not in testing requirements setting value allowed band, then issue control command to variable-frequency power sources according to testing requirements setting value, variable-frequency power sources regulates current operating state, run until motor can meet with rated frequency, till voltage is first testing site state of no-load test requirement, regulate and terminate,
Step 4-3: industrial computer collects motor running parameter, and contrast with testing requirements setting value, if actual operation parameters is in testing requirements setting value allowed band, then record the corresponding service data of motor; If do not meet, then wait for motor be adjusted to rated frequency under and carry out record by first testing site voltage range of no-load test requirement;
Step 4-4: after data record is complete, by the operational factor of second testing site of industrial computer setting no-load test, and operates by above-mentioned process of the test, completes the test of each testing site in no-load test by that analogy.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; those of ordinary skill in the field still can modify to the specific embodiment of the present invention with reference to above-described embodiment or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims of the present invention awaited the reply.
Claims (5)
1., based on a test method for the motor efficiency test automatically controlled, it is characterized in that: said method comprising the steps of:
Step 1: carry out motor heating test under motor nominal load;
Step 2: carry out motor load test on the basis of heat test;
Step 3: carry out torque modification under motor rated voltage and rated frequency;
Step 4: carry out motor no-load test.
2. the test method of the motor efficiency test based on automatically controlling according to claim 1, is characterized in that: described step 1 specifically comprises the following steps:
Step 1-1: by specified operational factors such as the industrial computer setting rated voltage of motor, rated frequency and output ratings, and issue control command to load power source and variable-frequency power sources, load power source and variable-frequency power sources output to motor experiment stage body according to the specified operational factor of motor, and keep running;
Step 1-2: along with the operation of motor, the actual operation parameters such as virtual voltage, real output, actual frequency of measurement instrument moment feedback motor, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual operation parameters of motor is not in testing requirements setting value allowed band, industrial computer issues control command to load power source and variable-frequency power sources by setting value, load power source and variable-frequency power sources regulate current operating state, until motor running to rated operation, regulate and terminate; If the actual operation parameters of motor changes again, then continue in the manner described above to regulate;
Step 1-3: industrial computer collects the actual operation parameters of motor, contrasts with testing requirements setting value, if actual operation parameters is in testing requirements setting value allowed band, then records a corresponding service data of motor by industrial computer every 30min; If do not meet, then wait for and be adjusted to the laggard line item of rated operation.
3. the test method of the motor efficiency test based on automatically controlling according to claim 1, is characterized in that: described step 2 specifically comprises the following steps:
Step 2-1: when the temperature difference that stator winding temperature and nominal load heat test record is within 5K, according to testing requirements, by the output power of rated voltage, rated frequency and first POL in the load test of industrial computer setting motor, industrial computer issues control order automatically to load power source and variable-frequency power sources;
Step 2-2: load power source and variable-frequency power sources output rated voltage, the output power of rated frequency and first POL is to motor stage body, the virtual voltage of measurement instrument moment feedback motor, actual frequency, the actual operation parameters such as real output, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual operation parameters of motor is not in testing requirements setting value allowed band, then issue control command to load power source and variable-frequency power sources by testing requirements setting value, load power source and variable-frequency power sources regulate current operating state, until motor running is in rated voltage, under rated frequency, and in the output power range of first POL till stable operation, regulate and terminate,
Step 2-3: industrial computer collects the actual operation parameters of motor, contrast with the output power of rated voltage, rated frequency and first POL in load test, if actual operation parameters is in testing requirements setting value allowed band, then record the corresponding service data of motor, if do not meet, then wait for and be adjusted to first laggard line item of POL steady operational status;
Step 2-4: after the actual operating data record of motor is complete, under motor is operated in rated voltage and rated frequency, by the output power of second POL in industrial computer setting load test, and regulated by load power source and variable-frequency power sources, and operate by above-mentioned process of the test, complete the test of each POL by that analogy.
4. the test method of the motor efficiency test based on automatically controlling according to claim 1, is characterized in that: described step 3 specifically comprises the following steps:
Step 3-1: by rated voltage and the rated frequency of industrial computer setting motor, industrial computer issues control order automatically to variable-frequency power sources, and variable-frequency power sources exports to motor stage body, runs under being adjusted to rated voltage and rated frequency;
Step 3-2: the actual operation parameters such as virtual voltage, actual frequency, actual power input of measurement instrument moment feedback motor, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual operation parameters of motor is not in testing requirements setting value allowed band, then issue control command to variable-frequency power sources according to testing requirements setting value, variable-frequency power sources regulates current operating state, until motor running is under rated frequency and rated voltage, regulates and terminate;
Step 3-3: industrial computer collects the actual operation parameters of motor, contrasts with testing requirements setting value, if actual operation parameters is in testing requirements setting value allowed band, then records the corresponding service data of motor; If do not meet, then wait for and be adjusted to the laggard line item of specified running status.
5. the test method of the motor efficiency test based on automatically controlling according to claim 1, is characterized in that: described step 4 specifically comprises the following steps:
Step 4-1: motor and load are thrown off, by industrial computer record power input, after the difference of two readings in succession meeting 30min power input of being separated by is not more than the condition of 3% of previous reading, according to testing requirements, carry out no-load test, by industrial computer setting motor rated frequency and required first the testing site voltage of motor no-load test, industrial computer issues control order regulates rated frequency and first testing site voltage to variable-frequency power sources automatically;
Step 4-2: variable-frequency power sources sets according to testing requirements, export the voltage of rated frequency and first testing site to motor stage body, the virtual voltage of measurement instrument moment feedback motor, actual current, the actual operation parameters such as actual power input, after industrial computer collects instrument parameter, compare with testing requirements setting value, if the actual working state of motor is not in testing requirements setting value allowed band, then issue control command to variable-frequency power sources according to testing requirements setting value, variable-frequency power sources regulates current operating state, run until motor can meet with rated frequency, till voltage is first testing site state of no-load test requirement, regulate and terminate,
Step 4-3: industrial computer collects motor running parameter, and contrast with testing requirements setting value, if actual operation parameters is in testing requirements setting value allowed band, then record the corresponding service data of motor; If do not meet, then wait for motor be adjusted to rated frequency under and carry out record by first testing site voltage range of no-load test requirement;
Step 4-4: after data record is complete, by the operational factor of second testing site of industrial computer setting no-load test, and operates by above-mentioned process of the test, completes the test of each testing site in no-load test by that analogy.
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