CN111103538A - Automatic test system for temperature rise of three-phase asynchronous alternating current motor winding - Google Patents
Automatic test system for temperature rise of three-phase asynchronous alternating current motor winding Download PDFInfo
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- CN111103538A CN111103538A CN201811257128.0A CN201811257128A CN111103538A CN 111103538 A CN111103538 A CN 111103538A CN 201811257128 A CN201811257128 A CN 201811257128A CN 111103538 A CN111103538 A CN 111103538A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses an automatic test system for the winding temperature rise of a three-phase asynchronous alternating current motor, which comprises a first switch and a second switch, wherein the first switch and the second switch are respectively used for connecting or disconnecting a circuit between a tested motor and a variable frequency power supply and a circuit between an accompanying motor and the variable frequency power supply; the voltage and current sensor is used for monitoring voltage and current data of the tested motor and the accompanying motor; the temperature sensing unit is used for measuring the surface temperature of the tested motor and the temperature of the cooling medium; the torque meter is used for measuring the rotating speed of the tested motor and the accompanying motor; the direct-current resistance measuring instrument is connected with the tested motor through the vacuum contactor and is used for measuring the resistance value of the winding of the tested motor; and the control unit is used for receiving the measurement data of the voltage and current sensor, the temperature sensing unit, the torquemeter and the direct-current resistance measuring instrument and controlling the first switch, the second switch, the vacuum contactor and the variable frequency power supply to work so as to automatically carry out temperature rise test of the motor winding. The method can improve the accuracy of the test result and ensure the personal safety of the tester to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of alternating current motor tests, and particularly relates to an automatic test system for temperature rise of a winding of a three-phase asynchronous alternating current motor.
Background
In the running process of the motor, if the temperature is too high, the insulating material of the winding of the motor is damaged, so that the service life of the motor is influenced, and therefore, a temperature rise test is an essential test project in motor test projects. The motor temperature rise test comprises a direct method and an indirect method, and the direct method is generally adopted. The direct method is that a tested motor runs under load under rated frequency, rated voltage and rated load or nameplate current, a feedback method is generally adopted, namely a set of variable frequency power supply respectively drives two motors with the same specification and model to drag, wherein one motor is tested, the other motor is an auxiliary motor, the tested motor drives the auxiliary motor to run, and the auxiliary motor is in a power generation state and feeds back electric energy to a direct current bus of the variable frequency power supply to partially provide energy required by the running of the tested motor. The common detection methods of the temperature rise of the motor include a thermocouple method and a resistance method. Because the resistance method can comprehensively reflect the average temperature rise condition of the motor winding, the resistance method is usually adopted for detecting the temperature rise of the motor winding. The working principle of the resistance method is that according to the winding resistance value and the corresponding time measured after the tested motor is completely stopped, the resistance value of the motor winding at the energy-off moment is calculated based on the measured winding resistance value and the corresponding time, and then the temperature rise value is calculated according to the value. It can be known from the working principle of the resistance method that in order to ensure accurate calculation of the resistance value, the winding resistance value of the tested motor must be measured as soon as possible after the tested motor is powered off, and the measured value is ensured to strictly correspond to the corresponding measuring time.
The operation process of the existing motor temperature rise test is that a tester manually measures the cold direct current resistance value and the cooling medium temperature of a motor by using a measuring instrument before the test, the tester manually sends a stop command according to the test type and starts manual timing when the test is finished, the tester manually measures the winding resistance value of the motor by using the measuring instrument after the motor is completely stopped, the resistance value and the corresponding time are manually recorded immediately after the resistance value is read, the resistance value and the time are measured for multiple times according to a certain time interval and are recorded until the winding resistance changes smoothly, and the tester inputs the measured data into a computer for display and calculation after the recording is finished. According to the operation process of the existing temperature rise test, a tester manually switches a measuring instrument to a motor winding after a motor completely stops, so that the resistor is cooled due to heat dissipation caused by time delay, and the result of the resistance value is inaccurate; slight deviation between the resistance measurement value and the corresponding time in the measurement process also has certain influence on the calculation. In addition, the shutdown condition is manually judged by a tester, and data such as the direct current resistance value, the time, the temperature and the like of the motor in the whole test process are manually collected and recorded by the tester, so that the labor amount of the tester is increased, the situation that the shutdown condition is met but the tester does not send a shutdown command in time to cause energy waste possibly exists, and the tester needs to enter a test site for measurement in the test process and possibly has factors influencing the personal safety of the tester.
Disclosure of Invention
One of the technical problems to be solved by the invention is to provide an automatic testing system for the temperature rise of a three-phase asynchronous alternating current motor winding, so that the accuracy of the motor temperature rise testing result is improved, and the personal safety of testing personnel is ensured to the maximum extent.
In order to solve the above technical problem, embodiments of the present application first provide an automatic testing system for temperature rise of winding of three-phase asynchronous ac motor, which is applied to temperature rise test of winding of motor including variable frequency power supply, motor under test and motor under test, the automatic testing system includes,
a first switch for connecting or disconnecting a circuit between the motor under test and a variable frequency power supply;
the second switch is used for connecting or disconnecting the circuit between the accompanying motor and the variable-frequency power supply;
a voltage current sensor for monitoring voltage current data of the tested motor and the accompanying motor;
a temperature sensing unit for measuring a surface temperature of the electric machine under test and a temperature of the cooling medium;
the torque meter is used for measuring the rotating speeds of the tested motor and the accompanying motor;
the direct-current resistance measuring instrument is connected with the tested motor through the vacuum contactor and is used for measuring the resistance value of the winding of the tested motor;
and the control unit is used for receiving the measurement data of the voltage and current sensor, the temperature sensing unit, the torquemeter and the direct-current resistance measuring instrument and controlling the first switch, the second switch, the vacuum contactor and the variable-frequency power supply to work so as to automatically perform the temperature rise test of the motor winding.
Preferably, the control unit consists of a PLC controller and an industrial personal computer;
the industrial personal computer receives the measurement data sent by the voltage and current sensor, the temperature sensing unit, the torquemeter and the direct current resistance measuring instrument and sends out a corresponding control command based on the test type of the temperature rise test;
and the PLC receives and drives the first switch, the second switch and the vacuum contactor to act based on the control command, and controls the output state of the variable frequency power supply.
Preferably, the industrial personal computer is configured to,
opening a section of storage area in a running test program, and storing the surface temperature data of the tested motor collected at a first preset time interval within a first preset time before the current moment;
and when the test type is long-term temperature rise, judging based on the temperature data in the storage area, and if the temperature rise of the surface of the tested motor reaches a preset threshold value, sending a shutdown command to the PLC.
Preferably, the first predetermined period of time is 1 hour and the first predetermined time interval is 1 minute.
Preferably, the industrial personal computer is configured to,
after a shutdown command is sent to the PLC, whether the tested motor completely stops or not is judged based on a speed signal of the tested motor detected by the torque meter;
and when the tested motor is judged to be completely stopped, controlling the direct-current resistance measuring instrument to measure the resistance value of the winding of the tested motor for multiple times, and calculating the winding resistance value at the moment of the energy failure of the tested motor according to the measured value and the measuring time corresponding to the measured value.
Preferably, the dc resistance measuring instrument is controlled to measure the resistance value of the winding of the tested motor for a plurality of times, specifically,
and controlling the direct current resistance measuring instrument to measure the resistance value of the winding of the tested motor for multiple times at a second preset time interval until the total measuring time is longer than a second preset time and the change rate of the measured value is smaller than a preset value.
Preferably, the main contacts of the vacuum contactor are respectively connected with the measuring end of the direct current resistance measuring instrument and any two-phase winding of the tested motor.
Preferably, the first switch and the second switch are both ac contactors;
and the PLC carries out interlocking control according to the auxiliary contact signals of the first switch and the vacuum contactor so as to ensure that the first switch and the vacuum contactor cannot be closed simultaneously and ensure the correct switching of the test loop and the resistance measurement loop.
Preferably, the winding temperature rise automatic test system further comprises a display connected with the industrial personal computer.
Preferably, the temperature sensing unit comprises an infrared temperature sensor for measuring the surface temperature of the tested motor.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the automatic test system automatically reads the temperature of the cooling medium and the cold direct current resistance of the tested motor before the temperature rise test, automatically judges the parking condition according to the test type given by a tester before the test starts in the test process to realize automatic parking, and can save energy compared with the prior art; after the test is finished, the system automatically finishes the measurement and collection of the thermal state direct current resistance and the time of the motor, and automatically calculates the temperature rise data according to the measurement result. The whole test process is automatically finished without manual field measurement of testers, so that the interference is reduced, the accuracy of test results is ensured, and the personal safety of the testers is ensured to the maximum extent.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technology or prior art of the present application and are incorporated in and constitute a part of this specification. The drawings expressing the embodiments of the present application are used for explaining the technical solutions of the present application, and should not be construed as limiting the technical solutions of the present application.
FIG. 1 is a schematic diagram of an automatic test system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a testing process using the automatic test system shown in fig. 1.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The embodiments and the features of the embodiments can be combined without conflict, and the technical solutions formed are all within the scope of the present invention.
The invention provides an automatic test system for the winding temperature rise of a three-phase asynchronous alternating current motor, which is applied to the motor winding temperature rise test comprising a variable frequency power supply, a tested motor and an accompanying motor.
The automatic test system of the present invention is shown in fig. 1, and includes,
a first switch 1 for connecting or disconnecting a circuit between the tested motor 2 and the variable frequency power supply 3;
a second switch 4 for connecting or disconnecting a circuit between the test-accompanying motor 5 and the variable frequency power supply 3;
a voltage current sensor 6 for monitoring voltage current data of the tested motor 2 and the accompanying motor 5;
a temperature sensing unit 7 for measuring a surface temperature of the electric machine under test and a temperature of the cooling medium;
a torque meter 8 for measuring the rotation speed of the tested motor 2 and the accompanying motor 5;
a direct current resistance measuring instrument 9 connected to the tested motor 2 through a vacuum contactor 10 for measuring a resistance value of a winding of the tested motor; specifically, a main contact of the vacuum contactor is respectively connected with a measuring end of the direct current resistance measuring instrument and any two-phase winding of the tested motor. Compared with a common contactor and a common relay, the vacuum contactor has smaller contact resistance (about 100u omega) and is less influenced by climate change, so that the influence on the resistance measurement of a motor winding is small, and the resistance measurement result is more accurate.
The device also comprises a control unit 11, which is used for receiving the measurement data of the voltage and current sensor 6, the temperature sensing unit 7, the torquemeter 8 and the direct current resistance measuring instrument 9, and controlling the first switch 1, the second switch 4, the vacuum contactor 10 and the variable frequency power supply 3 to work so as to automatically perform the temperature rise test of the motor winding.
In order to further understand the present invention, how the testing system automatically performs the temperature rise test of the motor winding is described in detail below with reference to a specific embodiment.
In this embodiment, the first switch 1 and the second switch 4 are ac contactors, and the temperature sensing unit 7 includes an infrared temperature sensor for measuring the surface temperature of the tested motor.
As shown in fig. 1, in this embodiment, the control unit 11 is constituted by an industrial personal computer 111 and a PLC controller 112. The test system also comprises a display 12 connected with the industrial personal computer 111.
The industrial personal computer 111 is mainly responsible for data acquisition and calculation, and the PLC controller 112 is mainly responsible for control. Specifically, the industrial personal computer 111 receives measurement data sent by the voltage and current sensor 6, the temperature sensing unit 7, the torquemeter 8 and the direct current resistance measuring instrument 9, and sends out a corresponding control command based on the test type of the temperature rise test; the PLC controller 112 receives and drives the first switch 1, the second switch 4 and the vacuum contactor 10 to act based on the control command, and controls the output state of the variable frequency power supply 3.
In this embodiment, a flow of performing a temperature rise test on a motor winding by using an automatic test system is shown in fig. 2.
When the test is started, the PLC controller 112 first controls the first switch 1 to be turned off in step S100, and the PLC controller 112 controls the vacuum contactor 10 to be turned on when detecting an off signal of the first switch 1.
And then, step S101 is carried out, after the vacuum contactor 10 is closed, the PLC 112 informs the industrial personal computer 111 to work, the industrial personal computer 111 collects the temperature of the cooling medium through the temperature sensing unit 7 and simultaneously sends a corresponding command to the direct current resistance measuring instrument 9, the direct current resistance measuring instrument 9 measures the cold resistance of the winding of the tested motor through the closed vacuum contactor 10 and transmits the cold resistance to the industrial personal computer 111 for storage, and the corresponding cooling medium temperature and the cold resistance are displayed in an upper computer interface through the display 12. In the invention, the recorded cold resistance value is called the actual cold direct current resistance of the test motor, and the recorded cooling medium temperature is the winding temperature corresponding to the actual cold direct current resistance measuring time.
In this embodiment, the dc resistance measuring instrument 9 is connected to the industrial personal computer 111 through an ethernet communication interface, so that the industrial personal computer 111 directly controls the dc resistance measuring instrument 9 to measure the resistance value of the winding of the tested motor in step S120. And the PLC controller 112 is also connected with the industrial personal computer 111 through ethernet communication to realize fast information exchange.
Then, step S102 is performed, and after the cold resistance value and the temperature of the cooling medium at that time are acquired, the industrial personal computer 111 notifies the PLC controller 112 of the completion of data acquisition, and the PLC controller controls the vacuum contactor 10 to be turned off.
Then, in step S103, the PLC controller 112 controls the first switch 1 and the second switch 4 to be closed after detecting that the vacuum contactor 10 is opened.
And step S104 is carried out, after the PLC 112 detects that the first switch 1 and the second switch 4 are attracted (the PLC is set to realize soft elements), the variable frequency power supply 3 is controlled to start to work, the motor starts to rotate, and the temperature rise test is started.
Then, as shown in step S105 in fig. 2, the temperature rise test is performed, the industrial personal computer 111 determines whether to stop the test based on the parking condition, and if the parking condition is satisfied, sends a stop command to the PLC controller 112, and the PLC controller 112 receives the stop command, sends a brake stop command to the variable frequency power supply 3, and notifies the industrial personal computer that the stop command has been sent.
Then, as shown in step S106 in fig. 2, the industrial personal computer 111 receives the power-on, starts timing, collects and stores the temperature of the cooling medium through the temperature sensing unit 7, and displays the temperature and the corresponding time in the interface of the upper computer, where the temperature is referred to as the temperature of the cooling medium at the moment when the power of the test motor is turned off in this application. As shown in fig. 2, step S107 is performed simultaneously with step S106, and determination of the motor rotation speed is started.
Note that, in step S105, the parking condition is associated with the type of the temperature rise test. For example, the type of temperature rise test includes a long-term temperature rise, a small-term temperature rise, and the like. Specifically, if the type of the temperature rise test is the hourly temperature rise, the parking condition is that the vehicle is parked after the temperature rise test is carried out for 1 hour; if the type of the temperature rise test is long-time temperature rise, judging based on the surface temperature data of the tested motor collected at a first preset time interval in a first preset time before the current time, and if the judged temperature rise reaches a specified threshold, meeting the parking condition.
In this embodiment, the test program of the industrial personal computer realizes the judgment of the parking condition corresponding to the hour temperature rise based on the built-in timer. And judging the parking condition corresponding to the long-term temperature rise, namely opening a section of storage area in a test program of the industrial personal computer, storing the surface temperature data of the tested motor per minute within 1 hour before the current moment, judging by the industrial personal computer based on the temperature data in the storage area when the test type is the long-term temperature rise, and sending a shutdown command to the PLC if the surface temperature rise of the tested motor is judged to reach a preset threshold value.
Returning to the description of the continued test flow in fig. 2, after the PLC controller 112 sends a braking stop instruction to the variable frequency power supply 3, the variable frequency power supply 3 absorbs the energy of the tested motor and consumes the energy in the built-in braking resistor to achieve rapid stopping, and it can be understood that the rotation speed of the tested motor is gradually reduced in the stopping stage.
In step S107, in the parking stage, the industrial personal computer 111 acquires a speed signal of the tested motor detected by the torque meter 8 to determine whether the tested motor 2 is completely stopped. If the motor rotation speed is 0, it is determined that the motor has completely stopped, and a motor stop notification is sent to the PLC controller 112.
Thereafter, in step S108, the PLC controller 112 controls the first switch 1 and the second switch 4 to be turned off, upon receiving the motor stop notification.
Then, in step S109, the PLC controller 112 controls the vacuum contactor 10 to close after detecting that the first switch 1 and the second switch 4 are opened.
It should be noted that, in this embodiment, the PLC controller 112 performs the interlock control according to the auxiliary contact signals of the first switch 1 and the vacuum contactor 10, so that the first switch 1 and the vacuum contactor 10 cannot be closed simultaneously, and the correct switching between the test loop (the main loop for driving the tested machine) and the resistance measurement loop (the loop of the dc resistance measuring instrument-the vacuum contactor-the resistance winding) is ensured, thereby avoiding the influence of the external device on the winding resistance measurement.
Then, as shown in step S110 in fig. 2, after the PLC controller 112 detects that the vacuum contactor is closed, the PLC controller 111 is notified to acquire the resistance value of the motor winding. After receiving the notification, the industrial personal computer 111 sends a command for reading the direct current resistance to the direct current resistance measuring instrument 9, and controls the direct current resistance measuring instrument to measure the resistance value of the winding of the tested motor once. And the industrial personal computer 111 receives the direct current resistance value measured by the direct current resistance measuring instrument 9 and simultaneously reads the timing value of the timer, and stores the direct current resistance value and the corresponding time measured this time and displays the direct current resistance value and the corresponding time in an interface of the upper computer.
Thereafter, as shown in step S111 in fig. 2, the industrial personal computer 111 performs measurement interval judgment. If it is determined that the second predetermined time interval is satisfied, the resistance value of the winding of the motor under test is measured again in step S111, and the measured dc resistance value and the corresponding time are stored and displayed in the same manner, as shown in step S112.
And further as shown in step S113 in fig. 2, it is determined whether the total time period from the start of step S110 to the current measurement is longer than a second predetermined time period, and it is determined whether the change rate of the measured value is smaller than a predetermined value based on the current measured dc resistance value and the last measured dc resistance value to determine whether the temperature change of the tested motor is gentle. For example, the second predetermined period of time is 5 minutes. For example, the predetermined value is 1%. And if the current measured direct current resistance value is equal to the last measured direct current resistance value (the change rate is 0), the temperature change is judged to be smooth.
As shown in fig. 2, steps S111 to S113 are performed in a loop to perform multiple measurements, and the collected dc resistance value and the corresponding time are recorded and displayed until the temperature changes slowly and the total measurement time is longer than a second predetermined time.
Then, as shown in step S114 in fig. 2, the industrial personal computer calculates the winding resistance value at the moment of the power failure of the tested motor by using a semilogarithmic method according to the recorded measured values and the measuring time corresponding to the measured values, and the calculated resistance value is referred to as the winding resistance at the moment of the power failure of the tested motor in the present invention. The semilogarithmic method can be found in prior publications and will not be described in detail here.
Finally, as shown in step S115 in fig. 2, based on the data recorded and calculated in the test, the industrial personal computer automatically calculates the temperature rise of the motor winding according to the temperature rise formula and displays it on the interface of the upper computer,
in the above formula: delta theta is the temperature rise of the winding of the tested motor, and the unit is Kelvin (K); r0The unit is milliohm (m omega) of the winding resistance at the moment when the tested motor is powered off; rcThe actual cold-state direct-current resistance of the tested motor is expressed in milliohm (m omega); theta0The temperature of the cooling medium at the moment of energy failure of the tested motor is in centigrade degree (DEG C); thetacThe winding temperature corresponding to the actual cold-state direct-current resistance measurement time is in centigrade degree (DEG C).
And finally, obtaining the temperature rise of the motor winding, and finishing the primary temperature rise test.
In addition, in the above embodiment, the industrial personal computer monitors the electrical parameter states of the two motors during the test through the current and voltage sensors and displays the electrical parameter states in an interface of the industrial personal computer, so that a tester can conveniently control the test process.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the automatic test system automatically reads the temperature of the cooling medium and the cold direct current resistance of the tested motor before the temperature rise test, automatically judges the parking condition according to the test type given by a tester before the test starts in the test process to realize automatic parking, and can save energy compared with the prior art; after the test is finished, the system automatically finishes the measurement and collection of the thermal state direct current resistance and the time of the motor, and automatically calculates the temperature rise data according to the measurement result. The whole test process is automatically finished without manual field measurement of testers, so that the interference is reduced, the accuracy of test results is ensured, and the personal safety of the testers is ensured to the maximum extent.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An automatic test system for the temperature rise of three-phase asynchronous AC motor winding is applied to the temperature rise test of the motor winding comprising a variable frequency power supply, a tested motor and an accompanying motor, and comprises,
a first switch for connecting or disconnecting a circuit between the motor under test and a variable frequency power supply;
the second switch is used for connecting or disconnecting the circuit between the accompanying motor and the variable-frequency power supply;
a voltage current sensor for monitoring voltage current data of the tested motor and the accompanying motor;
a temperature sensing unit for measuring a surface temperature of the electric machine under test and a temperature of the cooling medium;
the torque meter is used for measuring the rotating speeds of the tested motor and the accompanying motor;
the direct-current resistance measuring instrument is connected with the tested motor through the vacuum contactor and is used for measuring the resistance value of the winding of the tested motor;
and the control unit is used for receiving the measurement data of the voltage and current sensor, the temperature sensing unit, the torquemeter and the direct-current resistance measuring instrument and controlling the first switch, the second switch, the vacuum contactor and the variable-frequency power supply to work so as to automatically perform the temperature rise test of the motor winding.
2. The automatic test system of claim 1, wherein the control unit is comprised of a PLC controller and an industrial personal computer;
the industrial personal computer receives the measurement data sent by the voltage and current sensor, the temperature sensing unit, the torquemeter and the direct current resistance measuring instrument and sends out a corresponding control command based on the test type of the temperature rise test;
and the PLC receives and drives the first switch, the second switch and the vacuum contactor to act based on the control command, and controls the output state of the variable frequency power supply.
3. The automatic test system of claim 2, wherein the industrial personal computer is configured to,
opening a section of storage area in a running test program, and storing the surface temperature data of the tested motor collected at a first preset time interval within a first preset time before the current moment;
and when the test type is long-term temperature rise, judging based on the temperature data in the storage area, and if the temperature rise of the surface of the tested motor reaches a preset threshold value, sending a shutdown command to the PLC.
4. The automatic test system of claim 3, wherein the first predetermined length of time is 1 hour and the first predetermined time interval is 1 minute.
5. The automatic test system of claim 3, wherein the industrial personal computer is configured to,
after a shutdown command is sent to the PLC, whether the tested motor completely stops or not is judged based on a speed signal of the tested motor detected by the torque meter;
and when the tested motor is judged to be completely stopped, controlling the direct-current resistance measuring instrument to measure the resistance value of the winding of the tested motor for multiple times, and calculating the winding resistance value at the moment of the energy failure of the tested motor according to the measured value and the measuring time corresponding to the measured value.
6. The automatic test system according to claim 5, wherein said controlling said DC resistance measuring instrument performs a plurality of measurements of the resistance value of the winding of the tested motor, in particular,
and controlling the direct current resistance measuring instrument to measure the resistance value of the winding of the tested motor for multiple times at a second preset time interval until the total measuring time is longer than a second preset time and the change rate of the measured value is smaller than a preset value.
7. The automatic test system according to claim 2, wherein the main contacts of the vacuum contactor are connected to the measuring terminal of the dc resistance measuring instrument and any two-phase winding of the motor under test, respectively.
8. The automatic test system of claim 2, wherein the first switch and the second switch are both ac contactors;
and the PLC carries out interlocking control according to the auxiliary contact signals of the first switch and the vacuum contactor so as to ensure that the first switch and the vacuum contactor cannot be closed simultaneously and ensure the correct switching of the test loop and the resistance measurement loop.
9. The automatic test system of claim 2, wherein the winding temperature rise automatic test system further comprises a display connected to the industrial personal computer.
10. The automatic test system according to any one of claims 1 to 9, wherein the temperature sensing unit comprises an infrared temperature sensor for measuring the surface temperature of the tested motor.
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| CN113009340A (en) * | 2021-03-15 | 2021-06-22 | 日立电梯电机（广州）有限公司 | Motor temperature rise testing device, testing control method thereof and controller |
| CN113267271A (en) * | 2021-05-07 | 2021-08-17 | 广东白云学院 | Thermal state winding temperature rise test system and method |
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| CN111580034A (en) * | 2020-05-13 | 2020-08-25 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Integrated current transformer temperature rise test system and test method |
| CN113009340A (en) * | 2021-03-15 | 2021-06-22 | 日立电梯电机（广州）有限公司 | Motor temperature rise testing device, testing control method thereof and controller |
| CN113009340B (en) * | 2021-03-15 | 2023-02-28 | 日立电梯电机（广州）有限公司 | Motor temperature rise testing device, testing control method thereof and controller |
| CN113267271A (en) * | 2021-05-07 | 2021-08-17 | 广东白云学院 | Thermal state winding temperature rise test system and method |
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