Motor resistance automatic test equipment and method

Abstract

The invention relates to a motor resistance automatic test device and method, and the device comprises a power supply, an AC / DC conversion module, a first switch switching module, a second switch switching module, a test connector interface, a Uport unit, an upper computer unit, and a precision resistance test unit, and the output end of the AC / DC conversion module is connected with the first switch switching module and the second switch switching module. The precision resistance testing unit is connected with the upper computer unit through an RS232, the upper computer unit is connected with the Uport unit, the Uport unit is connected with the first switch switching module and the second switch switching module through an RS485, the first switch switching module and the second switch switching module are connected with the testing connector interface, and the testing connector interface is connected with the upper computer unit. The first switch switching module is connected with the precision resistance testing unit through a red meter pen, and the second switch switching module is connected with the precision resistance testing unit through a black meter pen. Winding resistance testing or Hall and locking device resistance testing is switched through the switch switching module, and the limitation that traditional automatic testing equipment can only test motor winding resistance is broken through.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor testing, and in particular, to an automatic motor resistance testing device and method. Background Art

[0002] With the development and wide application of motor technology, the requirements for motor testing equipment are gradually increasing. The resistance between motor windings, the resistance of Hall sensors, and the resistance of lock controllers are very important for evaluating the performance of motors. The automatic motor resistance testing equipment can automatically test the resistance between motor windings, the resistance of Hall sensors, and the resistance of lock controllers, saving cumbersome testing steps and greatly improving work efficiency.

[0003] Currently, when testing motor resistance, an ordinary multimeter is often used for manual reading, manual recording, and manual data collation, which is cumbersome and complex to operate and has low work efficiency. Existing motor resistance testing equipment mainly measures the insulation resistance of motors, that is, the resistance between the winding and the ground, and cannot automatically test the resistance between windings, the Hall resistance, and the lock controller resistance. For example, Document 1 (Song Kai, Measurement of Insulation Resistance and Polarization Index Test of Motors [J], Electricity and Instrumentation) proposes a method for detecting the insulation resistance of motors, but it cannot achieve automatic testing and cannot automatically test the resistance between windings, the Hall resistance, and the lock controller resistance. Document 2 (CN202311756079, An Automatic DC Resistance Testing System and Method for Motors) proposes an automatic DC resistance measurement system and method for motors, which does not have the function of measuring the Hall resistance and the lock controller resistance of motors and cannot automatically test the resistance between windings of the same phase. Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and propose an automatic motor resistance testing device and method that can achieve the automatic testing function of the winding resistance, Hall resistance, and lock controller resistance of multiple types of motors.

[0005] The technical problems of the present invention are solved by adopting the following technical solutions:

[0006] An automatic motor resistance testing device includes a 220V power supply, an AC / DC conversion module, a first switch switching module, a second switch switching module, a test connector interface, a Uport unit, a host computer unit, and a precision resistor testing unit. Among them, the 220V power supply is respectively connected to the input end of the AC / DC conversion module and the precision resistor testing unit for power supply. The output end of the AC / DC conversion module is respectively connected to the first switch switching module and the second switch switching module to convert alternating current into direct current. The precision resistor testing unit is connected to the host computer unit through the RS232 serial port. The host computer unit is connected to the Uport unit. The Uport unit is respectively connected to the first switch switching module and the second switch switching module through the RS485 serial port. The first switch switching module and the second switch switching module are respectively connected to the test connector interface. The first switch switching module is connected to the precision resistor testing unit through the red test lead, and the second switch switching module is connected to the precision resistor testing unit through the black test lead for testing the resistance.

[0007] Moreover, the AC / DC conversion module adopts an LRS-35-12 type conversion module to convert the 220V power supply into a 12V power supply.

[0008] Moreover, both the first switch switching module and the second switch switching module are composed of a 12-way relay and a communication module, and use RS485 communication.

[0009] Moreover, the precision resistor testing unit adopts a GDM-8342 type resistor testing unit to test the precision resistor, and the testing accuracy is 0.1Ω.

[0010] Moreover, the Uport unit adopts a UPort1250 dual-channel USB to serial converter to convert the RS485 communication of the first switch switching module and the second switch switching module into the USB communication of the host computer.

[0011] A testing method for an automatic motor resistance testing device includes the following steps:

[0012] Step 1: Turn on the 220V power supply to supply power to the automatic motor resistance testing device;

[0013] Step 2: Calibrate the device of the automatic motor resistance testing device to ensure the testing accuracy;

[0014] Step 3: Determine whether the automatic motor resistance testing device selects winding resistance testing or Hall and controller resistance testing. If winding resistance testing is selected, go to Step 4; otherwise, go to Step 5;

[0015] Step 4: The automatic motor resistance testing device selects winding resistance testing, determines the number of winding wires according to the motor model, and generates a winding resistance testing matrix, and then go to Step 6;

[0016] Step 5: The motor resistance automatic test equipment selects the Hall and controller resistance tests, generates a Hall and controller resistance test matrix, and proceeds to Step 6;

[0017] Step 6: Save the test results of the motor resistance automatic test equipment;

[0018] Step 7: Determine whether the test is completed. If the test is completed, end; otherwise, return to Step 2.

[0019] Moreover, the specific implementation method of Step 2 is as follows: When there is no motor connected, determine whether the value of the precision resistor test unit is 0. If it is not 0, clear the value of the precision resistor test unit through the host computer unit.

[0020] Moreover, the specific implementation method of Step 4 is as follows: When the motor winding test is selected, connect the motor winding wires to the test connector interface in sequence. The motor resistance automatic test equipment enters the winding resistance test process. The staff manually inputs the model and number of the motor to be tested through the host computer unit. After the motor resistance automatic test equipment determines whether the winding wire number is a three-wire winding or a four-wire winding according to the motor model, click the one-key test; if the judgment result is a three-wire winding, the first switch switching module and the second switch switching module control the first 9 test channels to be opened, and the host computer unit generates a three-wire winding resistance test matrix; if the judgment result is a four-wire winding, the first switch switching module and the second switch switching module control all 12 test channels to be opened, and the host computer unit generates a four-wire winding resistance test matrix.

[0021] Moreover, the specific implementation method of Step 5 is as follows: When the motor Hall and controller resistance test is selected, connect the five signal lines of the Hall and the two signal lines of the controller to the test connector interface in sequence. The motor resistance automatic test equipment enters the motor Hall and controller resistance test process. After the staff manually inputs the motor model and number through the host computer unit and clicks the one-key test, the first switch switching module and the second switch switching module control the first 5 test channels to be opened, and the host computer unit generates a Hall and controller resistance test matrix.

[0022] The advantages and positive effects of the present invention are:

[0023] 1. The present invention includes a 220V power supply, an AC / DC conversion module, a first switch switching module, a second switch switching module, a test connector interface, a Uport unit, a host computer unit, and a precision resistor test unit. Among them, the 220V power supply is respectively connected to the input end of the AC / DC conversion module and the precision resistor test unit for power supply. The output end of the AC / DC conversion module is respectively connected to the first switch switching module and the second switch switching module for converting alternating current into direct current. The precision resistor test unit is connected to the host computer unit through RS232. The host computer unit is connected to the Uport unit. The Uport unit is respectively connected to the first switch switching module and the second switch switching module through RS485. The first switch switching module and the second switch switching module are respectively connected to the test connector interface. The first switch switching module is connected to the precision resistor test unit through a red test lead, and the second switch switching module is connected to the precision resistor test unit through a black test lead for testing resistors. The present invention has the functions of testing the motor winding resistance, Hall resistance, and controller resistance. The test resistance is switched through the switch switching module, breaking through the limitation that traditional automatic test equipment can only test the motor winding resistance, and comprehensively and conveniently realizing the automatic test of the motor resistance.

[0024] 2. The present invention can test motors of multiple models by presetting motor parameters in the host computer unit, judge the three-wire winding and four-wire winding according to the motor model, and the host computer unit can generate different test matrices to improve the adaptability of the equipment to motors of multiple models.

[0025] 3. The present invention stores data through the host computer and can save the test data for users to view and record.

[0026] 4. The precision resistor test unit of the present invention uses the GDM-8342 model resistor test unit of GW Instek to test precision resistors, and the test accuracy can reach 0.1Ω, ensuring the test accuracy of the motor resistance; and it has a calibration function, improving the accuracy of the system test results compared with other test equipment without a calibration function. Description of the Drawings

[0027] Figure 1 is the system composition block diagram of the present invention;

[0028] Figure 2 is the working flow chart of the present invention;

[0029] Figure 3 is the three-wire winding test matrix of the present invention;

[0030] Figure 4 is the four-wire winding test matrix of the present invention;

[0031] Figure 5 is the Hall resistance and controller resistance test matrix of the present invention. Detailed implementation mode

[0032] The present invention will be further described in detail below with reference to the accompanying drawings.

[0033] An automatic motor resistance testing device, as Figure 1 shown, includes a 220V power supply, an AC / DC conversion module, a first switch switching module, a second switch switching module, a test connector interface, a Uport unit, a host computer unit, and a precision resistor testing unit. Among them, the 220V power supply is respectively connected to the input end of the AC / DC conversion module and the precision resistor testing unit for power supply. The output end of the AC / DC conversion module is respectively connected to the first switch switching module and the second switch switching module to convert alternating current into direct current. The precision resistor testing unit is connected to the host computer unit through RS232. The host computer unit is connected to the Uport unit. The Uport unit is respectively connected to the first switch switching module and the second switch switching module through RS485. The first switch switching module and the second switch switching module are respectively connected to the test connector interface. The first switch switching module is connected to the precision resistor testing unit through a red test lead, and the second switch switching module is connected to the precision resistor testing unit through a black test lead for testing the resistance.

[0034] Among them, both the first switch switching module and the second switch switching module are composed of a 12-way relay and a communication module, and RS485 communication can be used.

[0035] The precision resistor testing unit uses a GDM-8342 model resistor testing unit of GW Instek to test the precision resistor, and the test accuracy can reach 0.1Ω.

[0036] The Uport unit uses a MOXA UPort1250 dual-channel USB to serial converter to realize the conversion of RS485 communication of the first switch switching module and the second switch switching module into USB communication of the host computer.

[0037] A testing method for an automatic motor resistance testing device includes the following steps:

[0038] Step 1: Turn on the 220V power supply to supply power to the automatic motor resistance testing device.

[0039] Step 2: Calibrate the automatic motor resistance testing device to ensure the test accuracy.

[0040] Step 3: Determine whether the automatic motor resistance testing device selects winding resistance testing or Hall and controller resistance testing. If winding resistance testing is selected, go to Step 4; otherwise, go to Step 5.

[0041] Step 4: The automatic motor resistance testing device selects winding resistance testing, determines the number of winding wires according to the motor model, and generates a winding resistance testing matrix, and then goes to Step 6.

[0042] When the motor winding test is selected, the automatic motor resistance test equipment enters the winding resistance test process. The staff manually inputs the motor model and number, and the automatic motor resistance test equipment clicks the one-key test after judging the number of winding wires according to the motor model. If the judgment result is a three-phase winding, the automatic motor resistance test equipment generates a three-phase winding resistance test matrix. If the judgment result is a four-phase winding, the automatic motor resistance test equipment generates a four-phase winding resistance test matrix.

[0043] Step 5: The automatic motor resistance test equipment selects the Hall and controller resistance test, generates the Hall and controller resistance test matrix, and proceeds to Step 6.

[0044] When the motor Hall and controller resistance test is selected, the automatic motor resistance test equipment enters the motor Hall and controller resistance test process. The staff manually inputs the motor model and number and then clicks the one-key test to generate the Hall and controller resistance test matrix.

[0045] Step 6: Save the test results of the automatic motor resistance test equipment.

[0046] Step 7: Determine whether the test is completed. If the test is completed, end the process; otherwise, return to Step 2.

[0047] According to the above automatic motor resistance test equipment and method, by using a three-phase four-wire winding motor and adopting the automatic motor resistance test equipment to test the resistance of the three-phase four-wire winding motor to verify the effect of the present invention, the test steps are as follows:

[0048] S1: Power on the automatic motor resistance test equipment and turn on the power supply of the automatic motor resistance test equipment.

[0049] S2: The automatic motor resistance test equipment performs equipment calibration to ensure test accuracy.

[0050] S3: Connect the 12 wires of the three-phase four-wire winding motor to the test connector interface in sequence.

[0051] S4: The automatic motor resistance test equipment selects the winding resistance test:

[0052] The automatic motor resistance test equipment enters the winding resistance test process: manually input the motor model and number, and the automatic motor resistance test equipment clicks the one-key test after judging the number of winding wires according to the motor model. If the judgment result is a three-phase winding, the automatic motor resistance test equipment generates a three-phase winding resistance test matrix, as Figure 3 shown; if the judgment result is a four-phase winding, the automatic motor resistance test equipment generates a four-phase winding resistance test matrix, as Figure 4 shown.

[0053] Since the four-wire winding is adopted in this embodiment, that is, after entering the motor model and number JXL-01 and clicking the one-key test, it is determined to be a four-wire winding, and the motor resistance automatic test equipment generates a four-wire winding resistance test matrix, as Figure 4 shown.

[0054] S5. Connect the 7 wires including the Hall and controller signal wires of the three-phase four-wire winding motor to the test connector interface in sequence;

[0055] S6. The motor resistance automatic test equipment selects the Hall and controller resistance test:

[0056] The motor resistance automatic test equipment enters the motor Hall and controller resistance test process: manually enter the motor model and number and then click the one-key test to generate the Hall and controller resistance test matrix, as Figure 5 shown; in this embodiment, after entering the motor model and number JXL-01 and clicking the one-key test, the motor resistance automatic test equipment generates the Hall and controller resistance test matrix, as Figure 5 shown.

[0057] S7. Click to save the result, and the motor resistance automatic test equipment saves the test matrix;

[0058] S8. Determine whether to return to the initial interface. If it is selected to return to the initial page, the motor resistance automatic test equipment returns to the calibration page to continue the test; if it is selected not to return to the initial page, the motor resistance automatic test equipment ends the test.

[0059] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific embodiments. Any other embodiments obtained by those skilled in the art according to the technical solutions of the present invention also fall within the scope of protection of the present invention.

Claims

1. A motor resistance automatic test device, characterized in that: It includes a 220V power supply, an AC / DC conversion module, a first switch switching module, a second switch switching module, a test connector interface, a Uport unit, a host computer unit and a precision resistance test unit, wherein the 220V power supply is respectively connected to the input end of the AC / DC conversion module and the precision resistance test unit for power supply, the output end of the AC / DC conversion module is respectively connected to the first switch switching module and the second switch switching module for converting alternating current into direct current, the precision resistance test unit is connected to the host computer unit through an RS232 serial port, the host computer unit is connected to the Uport unit, the Uport unit is respectively connected to the first switch switching module and the second switch switching module through an RS485 serial port, the first switch switching module and the second switch switching module are respectively connected to the test connector interface, the first switch switching module is connected to the precision resistance test unit through a red test lead, and the second switch switching module is connected to the precision resistance test unit through a black test lead for testing resistance.

2. The motor resistance automatic testing device according to claim 1, characterized in that: The AC / DC conversion module adopts a LRS-35-12 model conversion module, which is used to convert a 220V power supply into a 12V power supply.

3. The motor resistance automatic testing device according to claim 1, characterized in that: The first switch switching module and the second switch switching module are both composed of 12-way relays and a communication module, and use RS485 communication.

4. The motor resistance automatic testing device according to claim 1, characterized in that: The precision resistance testing unit adopts the GDM-8342 model resistance testing unit to test the precision resistance, and the testing accuracy is 0.1Ω.

5. The motor resistance automatic testing device according to claim 1, characterized in that: The Uport unit adopts a UPort1250 dual-channel USB to serial port converter to convert the RS485 communication of the first switch switching module and the second switch switching module into the USB communication of the host computer.

6. A method for testing a motor resistance automatic test device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Turn on the 220V power supply to power the motor resistance automatic test equipment; Step 2: Calibrate the motor resistance automatic test equipment to ensure test accuracy; Step 3, determine whether the motor resistance automatic test device selects winding resistance test or Hall and lock resistance test. If winding resistance test is selected, proceed to step 4, otherwise proceed to step 5; Step 4: The motor resistance automatic test device selects the winding resistance test, determines the number of winding wires according to the motor model, and generates a winding resistance test matrix, and proceeds to step 6; Step 5: The motor resistance automatic test equipment selects the Hall and latch resistance test, generates the Hall and latch resistance test matrix, and proceeds to step 6; Step 6, save the test results of the motor resistance automatic test equipment; Step 7: Determine whether the test is completed. If the test is completed, the process ends; otherwise, return to step 2.

7. The motor resistance automatic testing device and method according to claim 6, characterized in that: The specific implementation method of step 2 is: when there is no motor connected, determine whether the value of the precision resistance test unit is 0, if not 0, clear the value of the precision resistance test unit to 0 through the host computer unit.

8. The testing method of the motor resistance automatic testing equipment according to claim 6, characterized in that: The specific implementation method of step 4 is as follows: when the motor winding test is selected, the motor winding wires are connected to the test connector interface in sequence, the motor resistance automatic test device enters the winding resistance test process, the staff manually inputs the motor model and number to be tested through the host computer unit, and the motor resistance automatic test device judges whether the number of winding wires is three-wire winding or four-wire winding according to the motor model and clicks a one-key test; if the judgment result is three-wire winding, the first switch switching module and the second switch switching module control the first 9 test channels to be turned on, so that the host computer unit generates a three-wire winding resistance test matrix; If the judgment result is a four-wire winding, the first switch switching module and the second switch switching module control all 12 test channels to be turned on, so that the host computer unit generates a four-wire winding resistance test matrix.

9. The testing method of the motor resistance automatic testing equipment according to claim 6, characterized in that: The specific implementation method of step 5 is: when the motor Hall and brake resistance test is selected, the five signal lines of the Hall and the two signal lines of the brake are connected to the test connector interface in sequence, and the motor resistance automatic test equipment enters the motor Hall and brake resistance test process. The staff manually enters the motor model and number through the host computer unit and clicks a one-key test. The first switch switching module and the second switch switching module control the first 5 test channels to open, so that the host computer unit generates a Hall and brake resistance test matrix.

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