Motor test equipment and test method

Abstract

The invention discloses motor testing equipment and a testing method, relates to the field of motor testing, and solves the problem that a motor manufacturer cannot perform deep testing on a motor, and the motor testing equipment comprises a no-load testing unit which is used for calculating iron core loss and mechanical loss of a to-be-tested motor according to no-load data, judging whether the no-load test of the to-be-tested motor is qualified by combining the iron core loss and the mechanical loss, if not, generating a no-load abnormal signal, and if yes, generating a no-load normal signal and entering the next test link; the performance test unit is used for judging whether the performance test of the to-be-tested motor is qualified or not according to the performance test, generating a performance abnormal signal if the performance test is not qualified, and generating a performance normal signal if the performance test is qualified and entering a next test link; and the precision test unit is used for judging whether the precision test of the test motor is qualified or not according to the precision data, generating a precision abnormal signal if the precision test is not qualified, and generating a precision normal signal if the precision test is qualified.

Description

Technical Field

[0001] The invention belongs to motor testing technology, in particular to a motor testing device and a testing method. Background Art

[0002] Motor, commonly known as motor, refers to an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction. It is divided into servo motor, stepper motor, torque motor, switched reluctance motor, brushless DC motor, DC motor, asynchronous motor, synchronous motor, etc. It is mainly composed of stator, rotor, end cover, bearing, fan, etc.

[0003] When conducting motor testing at present, motor manufacturers usually only test the appearance, structural strength and starting status of the motor, but are unable to conduct in-depth testing of the motor, such as the idling condition and performance of the motor. Therefore, we propose a motor testing device and testing method. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a motor testing device and a testing method.

[0005] The technical problems to be solved by the present invention are: How to achieve in-depth and comprehensive testing of motors.

[0006] The purpose of the present invention can be achieved through the following technical solutions: In a first aspect, a motor testing device comprises: Before testing the motor, record the motor to be tested as the motor to be tested; A data acquisition unit, used to obtain no-load data, performance data and accuracy data during the test of the motor to be tested; The motor test module includes a no-load test unit, a performance test unit and an accuracy test unit; The no-load test unit is used to calculate the core loss and mechanical loss of the motor to be tested based on the no-load data, and determine whether the no-load test of the motor to be tested is qualified in combination with the core loss and mechanical loss. If it is unqualified, a no-load abnormal signal is generated; if it is qualified, a no-load normal signal is generated and the next test link is entered; A performance test unit is used to determine whether the motor to be tested is qualified according to the performance test. If it is unqualified, a performance abnormality signal is generated; if it is qualified, a performance normal signal is generated and the next test link is entered; The accuracy test unit is used to determine whether the test motor accuracy test is qualified according to the accuracy data, and generate an accuracy abnormality signal if it is unqualified, and generate a accuracy normal signal if it is qualified; The display terminal is used to display various test results of the motor to be tested.

[0007] Furthermore, the no-load data includes the current and resistance flowing through the stator winding, the input power and speed of the motor to be tested, the number of pole pairs of the rotating magnetic field in the motor to be tested, the core, stator winding, and Steinmetz coefficient characterizing the magnetic medium in the motor to be tested, and the volume and peak magnetic induction intensity of the motor to be tested; The performance data includes the output voltage and output power of the power module, the model of the motor to be tested, the load voltage, load current, ground current, real-time voltage value, real-time motor temperature, operation start time point, operation end time point, start signal sending time point, end signal sending time point, and the insulation resistance value of the solid dielectric in the motor to be tested; The accuracy data includes pictures of the locations of threaded holes in the motor to be tested and the part dimensions of the components.

[0008] In a second aspect, a motor testing method is provided, and the motor testing method is specifically as follows: Step S1, performing a no-load test on the motor to be tested, calculating the core loss and mechanical loss of the motor to be tested, and determining whether the motor to be tested is qualified based on the core loss and mechanical loss; Step S2, performing a performance test on the motor to be tested, calculating and analyzing the performance of the motor to be tested, and judging whether the performance of the motor to be tested is qualified based on the analysis result; Step S3, performing an accuracy test on the motor to be tested to determine whether the accuracy of the motor to be tested is qualified; Step S4, the display terminal displays various test results of the motor to be tested, including the test results of the no-load test, the performance test and the accuracy test.

[0009] Furthermore, the step S1 includes the following sub-steps: Obtain the stator current Ir flowing through the stator winding and the resistance R of the stator winding, and use the formula Calculate the stator copper loss PCu of the motor to be tested; Then, the input power Po of the motor to be tested is obtained, and the total loss of the motor to be tested is obtained by subtracting the stator copper loss of the motor to be tested from the input power of the motor to be tested. The total loss is the sum of the core loss and the mechanical loss.

[0010] At the same time, obtain the speed n of the motor to be tested and the number of pole pairs p of the rotating magnetic field in the motor to be tested, and use the formula Calculate and obtain the power frequency f of the motor to be tested;

[0011] Finally, the iron core, stator winding, Steinmetz coefficient characterizing the magnetic medium, volume and peak magnetic induction intensity B of the motor to be tested are obtained, and the formula is used The core loss PFe of the motor to be tested is calculated; wherein k is the Steinmetz coefficient of the core in the motor to be tested, a is the Steinmetz coefficient of the stator winding in the motor to be tested, and b is the Steinmetz coefficient representing the magnetic medium in the motor to be tested; Then the mechanical loss PMe of the motor to be tested is obtained by subtracting the core loss from the total loss; Using the formula and formula The core loss rate TSL and mechanical loss rate JSL of the motor to be tested are calculated respectively; If the core loss rate is greater than or equal to the core loss rate threshold or the mechanical loss rate is greater than or equal to the mechanical loss rate threshold, a no-load abnormal signal is generated; if the core loss rate is less than the core loss rate threshold and the mechanical loss rate is less than the mechanical loss rate threshold, a no-load normal signal is generated and the next test phase is entered.

[0012] Furthermore, the performance test includes a withstand voltage test, an electrical test and a signal test.

[0013] Furthermore, the withstand voltage test in step S2 includes the following sub-steps: The power module provides load voltage and load power to the motor to be tested. First, the model of the motor to be tested is obtained, and the initial test voltage value, test voltage peak value and test duration of the motor to be tested are set according to the model. The motor to be tested is subjected to a withstand voltage test. The withstand voltage test sets the boost points on average according to the test duration. The interval between each two boost points is at least ten seconds and the voltage added at each boost point is the same. The withstand voltage test ends after the voltage increases to the test voltage peak value. Then, the real-time voltage value of the motor to be tested during the withstand voltage test is obtained, and the real-time voltage value is compared with the initial test voltage value and the real-time voltage value is compared with the test voltage peak value; If the real-time voltage value of the motor to be tested is lower than the initial test voltage value or the real-time voltage value is higher than the test voltage peak value, a performance abnormality signal is generated; if the real-time voltage value of the motor to be tested is higher than the initial test voltage value and the real-time voltage value is lower than the test voltage peak value, the output voltage and output power of the power module are obtained, the output voltage of the power module is compared with the standard voltage of the power module corresponding to the motor to be tested, and the output power of the power module is compared with the standard power of the power module corresponding to the motor to be tested; If the output voltage of the power module is less than the standard voltage of the motor to be tested corresponding to the power module or the output power of the power module is less than the standard power of the motor to be tested corresponding to the power module, a performance abnormality signal is generated; If the output voltage of the power module is greater than or equal to the standard voltage of the motor to be tested corresponding to the power module and the output power of the power module is greater than or equal to the standard power of the motor to be tested corresponding to the power module, the real-time motor temperature of the motor to be tested at each boost point is obtained, and the real-time motor temperature of the motor to be tested at each boost point is compared with the standard maximum motor temperature of the same model motor under the same test conditions; If the real-time motor temperature of the motor under test at any two boost points is greater than the standard motor temperature of the same model motor under the same test conditions, a performance abnormality signal is generated; If the real-time motor temperature of the motor to be tested at all boost points is less than or equal to the standard motor temperature of the same model motor under the same test conditions, the ground current of the motor to be tested is obtained, and the ground current of the motor to be tested is compared with the standard ground current of the same model motor; If the ground current of the motor to be tested is greater than the standard ground current of the motor of the same model, a performance abnormality signal is generated; If the grounding current of the motor to be tested is equal to the standard grounding current of a motor of the same model, the insulation resistance value of the solid dielectric in the motor to be tested is obtained, and the insulation resistance value of the solid dielectric in the motor to be tested is compared with the insulation resistance value of a solid dielectric of the same material; If the insulation resistance value of the solid dielectric in the motor to be tested is not equal to the insulation resistance value of the solid dielectric of the same material, a performance abnormality signal is generated; If the insulation resistance value of the solid dielectric in the motor to be tested is equal to the insulation resistance value of the solid dielectric of the same material, the electrical test phase is entered.

[0014] Furthermore, the electrical test in step S2 includes the following sub-steps: Obtain the load voltage V and load current I of the motor to be tested, add the load voltage and load current to the Y1 output terminal and Y2 output terminal of the dual-trace oscilloscope respectively, adjust the dual-trace oscilloscope until a stable waveform is displayed on the screen, read the horizontal axis length L occupied by the waveform in a fixed period, and read the interval Lr between the zero crossing points of the two waveforms; First, use the formula Calculate the phase difference between the load current and the load voltage ; Reuse formula Calculate and obtain the apparent power S of the motor to be tested; Then use the formula and formula Calculate the active power P and reactive power Q of the motor to be tested; Finally, the formula and Calculate the active ratio YGB and reactive ratio WGB of the motor to be tested; If the active ratio of the motor to be tested is less than the preset active ratio or the reactive ratio is greater than the preset reactive ratio, a performance abnormality signal is generated; If the active ratio of the motor to be tested is greater than or equal to the preset active ratio and the reactive ratio is less than or equal to the preset reactive ratio, the start time point and the end time point of the motor to be tested are obtained, and the running time t of the motor to be tested is obtained by subtracting the start time point from the end time point of the motor to be tested, and the formula is used to calculate the running time t of the motor to be tested. The energy consumption E of the motor to be tested is calculated, and the energy consumption of the motor to be tested is compared with the step energy consumption of the same model motor under the same test conditions; If the energy consumption of the motor under test is greater than the step energy consumption of a motor of the same model under the same test conditions, a performance abnormality signal is generated; If the energy consumption of the motor to be tested is less than or equal to the step energy consumption of the same model motor under the same test conditions, the signal test phase is entered.

[0015] Furthermore, the signal test in step S2 includes the following sub-steps: Obtain the start signal sending time point and the end signal sending time point of the motor to be tested, subtract the start signal sending time point from the start time point of the operation to obtain a signal receiving time length, and at the same time subtract the end signal sending time point from the end time point of the operation to obtain another signal receiving time length, restart and shut down the motor to be tested n times to obtain 2n signal receiving time lengths; Compare the reception time of the 2n-segment signal with the preset reception time; If the reception duration of the 2n signal segments is less than or equal to the preset reception duration, proceed to the next step; If any signal reception duration is longer than the preset reception duration, the corresponding signal reception duration is calibrated as the signal delay duration, the number of signal delay durations is recorded as the signal delay duration number, the sum of all signal delay durations is added and divided by the signal delay duration number to obtain the average signal delay duration of the motor to be tested, the average signal delay duration of the motor to be tested is compared with the standard signal delay duration of the same model of motor, if the average signal delay duration of the motor to be tested is longer than the standard signal delay duration of the same model of motor, a signal abnormality signal is generated, if the average signal delay duration of the motor to be tested is less than or equal to the standard signal delay duration of the same model of motor, proceed to the next step; An external signal sending end is connected to the motor to be tested, and a signal receiving end that can synchronously acquire the signal received by the motor to be tested is arranged on the motor to be tested. The signal sending end sends a multi-segment analog signal with known signal characteristics to the motor to be tested, and the signal receiving end synchronously acquires the real-time signal characteristics of the multi-segment analog signal, and compares the known signal characteristics of the analog signal sent by the signal sending end with the real-time signal characteristics of the corresponding analog signal acquired by the signal receiving end. If the known signal characteristics are consistent with the corresponding real-time signal characteristics, the number of accurate receptions of the analog signal increases by one; if the known signal characteristics are inconsistent with the corresponding real-time signal characteristics, the number of accurate deviations of the analog signal increases by one; Using the formula Calculate the signal accuracy rate ZQL of the motor to be tested; where m is the total number of segments of the analog signal, and h is the number of accurate receptions of the analog signal; If the signal accuracy of the motor to be tested is less than the preset signal accuracy, a signal abnormality signal is generated; If the signal accuracy of the motor to be tested is greater than or equal to the preset signal accuracy, a normal signal is generated and the accuracy test phase is entered.

[0016] Furthermore, the step S3 includes the following sub-steps: Take pictures of the locations of all threaded holes in the motor to be tested; Under the same shooting conditions, the position pictures of the threaded holes in the motor to be tested are overlapped and compared with the position pictures of the corresponding threaded holes in the motor of the same model; If the position picture of any threaded hole in the motor to be tested is different from the position picture of the corresponding threaded hole in the motor of the same model, an accuracy abnormality signal is generated; If the position pictures of all threaded holes in the motor to be tested are the same as the position pictures of the corresponding threaded holes in the motor of the same model, the part sizes of different components in the motor to be tested are measured, and the part sizes of different components in the motor to be tested are compared with the standard sizes of corresponding components in the motor of the same model. If the part sizes of the components are consistent with the corresponding standard sizes, a qualified accuracy signal is generated. If the part size of any component is inconsistent with the corresponding standard size, an abnormal accuracy signal is generated.

[0017] Furthermore, the analysis process of the overlapping comparison analysis is specifically as follows: Stack the position pictures of the threaded holes in the motor to be tested with the position pictures of the corresponding threaded holes in the motor of the same model; Select the center point of any threaded hole as the origin to construct a three-dimensional coordinate system, and mark the threaded hole as the initial threaded hole; Calculate the real-time distance between the center point of all threaded holes and the center point of the initial threaded hole. Similarly, obtain the standard distance between all threaded holes and the initial threaded hole in the same model motor. If the real-time distance is not equal to the standard distance of the standard distance, an accuracy abnormality signal is generated; If the real-time distance is equal to the standard distance, the center point of the threaded hole and the outer diameter of the threaded hole are used to construct the real-time threaded area corresponding to each threaded hole. Similarly, the standard threaded area of ​​each threaded hole in the same model motor is constructed, and the real-time threaded area is compared with the standard threaded area. If the real-time threaded areas of all threaded holes overlap with the corresponding standard threaded areas, the subsequent comparison step is entered. If the real-time threaded area of ​​any threaded hole does not overlap with the corresponding standard threaded area, an accuracy exception signal is generated.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention first performs a no-load test on the motor, calculates the core loss and mechanical loss of the motor to be tested, and determines whether the motor to be tested is qualified in combination with the calculated core loss and mechanical loss. If the idling test is qualified, a performance test is performed on the motor, and the performance of the motor to be tested is calculated and analyzed. Based on the analysis result, it is determined whether the performance of the motor to be tested is qualified. If the performance of the motor is qualified, the motor is further precision tested, and finally it is determined whether the precision of the motor to be tested is qualified. The present invention enables motor manufacturers to conduct in-depth and comprehensive tests on motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a connection block diagram of the test equipment in the present invention; Figure 2 It is a structural schematic diagram of the testing device in the present invention; Figure 3 is a flow chart of the method of the present invention; Figure 4 is a circuit diagram of a dual-trace oscilloscope in the present invention; Figure 5 Schematic diagram of the waveform of the dual-trace oscilloscope in the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figure 1-2 As shown, the technical solution provided by the present invention is: a motor testing device, comprising; Before testing the motor, the motor to be tested is uniformly defined as the motor to be tested; A data acquisition unit, used to obtain no-load data, performance data and accuracy data during the test of the motor to be tested; Motor test module, used to perform no-load test, performance test and accuracy test on the motor to be tested; Specifically, the motor test module includes a no-load test unit, a performance test unit, and an accuracy test unit; The no-load test unit is used to calculate the core loss and mechanical loss of the motor to be tested based on the no-load data, and determine whether the no-load test of the motor to be tested is qualified in combination with the core loss and mechanical loss. If it is unqualified, a no-load abnormal signal is generated; if it is qualified, a no-load normal signal is generated and the next test link is entered; A performance test unit is used to determine whether the motor to be tested is qualified according to the performance test. If it is unqualified, a performance abnormality signal is generated; if it is qualified, a performance normal signal is generated and the next test link is entered; The accuracy test unit is used to determine whether the test motor accuracy test is qualified according to the accuracy data, and generate an accuracy abnormality signal if it is unqualified, and generate a accuracy normal signal if it is qualified; Display terminal, used to display various test results of the motor to be tested; In specific implementation, the motor test equipment includes a test bench, an empty-load test bench, a performance test bench and a precision test bench. The surface of the test bench is provided with a device conveyor belt, which is arranged horizontally. The test bench is evenly installed with empty-load test benches, performance test benches and precision test benches in a cross order. A start button is installed on the test bench, which is used to control the start of the device conveyor belt. Each time the staff presses the start button, the device conveyor belt moves forward to the next test bench. After the staff places the motor to be tested in the initial position, they press the start button to drive the equipment conveyor belt to the no-load test bench. When the equipment conveyor belt moves the motor to be tested to the no-load test bench, the staff places the motor to be tested on the equipment rotating table to test the no-load state of the motor; if the no-load test bench tests that the no-load state of the motor to be tested is unqualified, the motor to be tested on the no-load test bench is taken out and the next motor to be tested is tested; if the no-load test bench tests that the no-load current of the motor to be tested is qualified, the staff presses the start button to drive the equipment conveyor belt to send the motor to be tested to the performance test bench; After the equipment conveyor belt sends the motor to be tested to the performance test bench, the staff will place the motor to be tested on the performance test bench. The performance test bench will first perform a withstand voltage test on the motor to determine whether the motor is qualified. If the motor is not qualified, no subsequent tests will be performed. If the motor is qualified, the electrical performance and signal performance of the motor will be tested. If all subsequent tests are qualified, the equipment conveyor belt will be driven to send the motor to the precision test bench. The precision test bench performs precision tests on the motor to be tested, judging whether the position of the threaded holes on the motor to be tested is accurate and whether the dimensions of the components are accurate. After the test is completed, the staff will take out the motor to be tested and press the start button to test the next motor to be tested. Example 2: Please refer to Figure 3-5 As shown, based on another concept of the same invention, a motor testing method is now proposed, and the motor testing method includes the following steps: Step S1, performing a no-load test on the motor to be tested, calculating the core loss and mechanical loss of the motor to be tested based on the no-load data, and determining whether the motor to be tested is qualified in combination with the core loss and mechanical loss; The no-load data includes the current and resistance flowing through the stator winding, the input power and speed of the motor to be tested, the number of pole pairs of the rotating magnetic field in the motor to be tested, the iron core, stator winding, and Steinmetz coefficient characterizing the magnetic medium in the motor to be tested, and the volume and peak magnetic induction intensity of the motor to be tested; It needs to be explained that the characterization magnetic medium is a material whose internal state changes under the action of a magnetic field and reversely affects the existence or distribution of the magnetic field. The Steinmetz coefficient is a parameter used to describe the energy loss of ferromagnetic materials during periodic magnetization. Different materials have different Steinmetz coefficients. The Steinmetz coefficients used in this embodiment are all Steinmetz coefficients corresponding to the materials. The peak magnetic induction intensity is the maximum magnetic field induction capacity of the current in the magnetic field. Step S1 includes the following sub-steps: Step S101, performing a no-load test on the motor to be tested, and obtaining the stator current Ir flowing through the stator winding and the resistance R of the stator winding; Step S102, using formula Calculate the stator copper loss PCu of the motor to be tested; Step S103, obtaining the input power Po of the motor to be tested, and obtaining the total loss of the motor to be tested by subtracting the stator copper loss of the motor to be tested from the input power of the motor to be tested, where the total loss is the sum of the core loss and the mechanical loss; Step S104, obtaining the rotation speed n of the motor to be tested and the number of pole pairs p of the rotating magnetic field in the motor to be tested; Step S105, using formula Calculate and obtain the power frequency f of the motor to be tested; Step S106, obtaining the iron core, stator winding, Steinmetz coefficient characterizing the magnetic medium, and the volume and peak magnetic induction intensity B of the motor to be tested; Step S107, using formula The core loss PFe of the motor to be tested is calculated; wherein k is the Steinmetz coefficient of the core in the motor to be tested, a is the Steinmetz coefficient of the stator winding in the motor to be tested, and b is the Steinmetz coefficient representing the magnetic medium in the motor to be tested; Then the mechanical loss PMe of the motor to be tested is obtained by subtracting the core loss from the total loss;

[0023] Step S108, using formula and formula The core loss rate TSL and mechanical loss rate JSL of the motor to be tested are calculated respectively; Step S109, if the core loss rate is greater than or equal to the core loss rate threshold or the mechanical loss rate is greater than or equal to the mechanical loss rate threshold, then a no-load abnormal signal is generated; If the core loss rate is less than the core loss rate threshold and the mechanical loss rate is less than the mechanical loss rate threshold, the motor to be tested is calibrated to be qualified for no-load, a no-load normal signal is generated and the next test phase is entered; Step S2, performing a performance test on the motor to be tested, calculating and analyzing the performance of the motor to be tested according to the performance data, and judging whether the performance of the motor to be tested is qualified based on the analysis result; Among them, the performance test includes voltage resistance test, electrical test and signal test, and the performance data includes the output voltage and output power of the power module, the model of the motor to be tested, the load voltage, load current, ground current, real-time voltage value, real-time motor temperature, operation start time point, operation end time point, start signal sending time point, end signal sending time point and the insulation resistance value of the solid dielectric in the motor to be tested; among them, the power module is an electric power device that can provide a power source for the motor to be tested, etc., and the solid dielectric is a substance that can polarize and store electrical energy under the action of an electric field, including glass, resin and high molecular polymer, etc.; The withstand voltage test in step S2 includes the following sub-steps: Step S2011, the power module provides load voltage and load power to the motor to be tested; Obtain the model of the motor to be tested, set the initial test voltage value, test voltage peak value and test duration of the motor to be tested according to the model, and perform a withstand voltage test on the motor to be tested. The withstand voltage test sets the boost points on average according to the test duration. The interval between each two boost points is at least ten seconds and the voltage added at each boost point is the same. The withstand voltage test ends after the voltage increases to the test voltage peak value. Step S2012, obtaining the real-time voltage value of the motor to be tested during the withstand voltage test, comparing the real-time voltage value with the initial test voltage value and comparing the real-time voltage value with the test voltage peak value; If the real-time voltage value of the motor to be tested is lower than the initial test voltage value or the real-time voltage value is higher than the test voltage peak value, a performance abnormality signal is generated and no subsequent steps are required. If the real-time voltage value of the motor to be tested is higher than the initial test voltage value and the real-time voltage value is lower than the test voltage peak value, the next step is performed, indicating that there is no abnormality in the motor to be tested; Step S2013, obtaining the output voltage and output power of the power module, comparing the output voltage of the power module with the standard voltage of the motor to be tested corresponding to the power module, and comparing the output power of the power module with the standard power of the motor to be tested corresponding to the power module; If the output voltage of the power module is less than the standard voltage of the motor to be tested corresponding to the power module or the output power of the power module is less than the standard power of the motor to be tested corresponding to the power module, a performance abnormality signal is generated, and no subsequent steps are required. The power module is replaced and the withstand voltage test is performed again on the motor to be tested. If the output voltage of the power module is greater than or equal to the standard voltage of the motor to be tested corresponding to the power module and the output power of the power module is greater than or equal to the standard power of the motor to be tested corresponding to the power module, the next step is entered; Step S2014, obtaining the real-time motor temperature of the motor to be tested at each boost point, and comparing the real-time motor temperature of the motor to be tested at each boost point with the standard maximum motor temperature of the same model motor under the same test conditions; If the real-time motor temperature of the motor to be tested at any two boost points is greater than the standard motor temperature of the same model motor under the same test conditions, a performance abnormality signal is generated, and no subsequent steps are required, indicating that the motor to be tested has a temperature abnormality. If the real-time motor temperature of the motor to be tested at all boost points is less than or equal to the standard motor temperature of the same model motor under the same test conditions, proceed to the next step; Step S2015, obtaining the grounding current of the motor to be tested, and comparing the grounding current of the motor to be tested with the standard grounding current of a motor of the same model; If the ground current of the motor to be tested is greater than the standard ground current of the motor of the same model, a performance abnormality signal is generated, and no subsequent steps are required, indicating that the motor to be tested has an abnormal ground current. If the ground current of the motor to be tested is equal to the standard ground current of the motor of the same model, proceed to the next step; Step S2016, obtaining the insulation resistance value of the solid dielectric in the motor to be tested, and comparing the insulation resistance value of the solid dielectric in the motor to be tested with the insulation resistance value of a solid dielectric of the same material; If the insulation resistance value of the solid dielectric in the motor to be tested is not equal to the insulation resistance value of the solid dielectric of the same material, a performance abnormality signal is generated, and no subsequent steps are required, indicating that the motor to be tested has a solid dielectric abnormality. If the insulation resistance value of the solid dielectric in the motor to be tested is equal to the insulation resistance value of the solid dielectric of the same material, the electrical test phase is entered; like Figure 4-Figure 5 As shown, the electrical test in step S2 includes the following sub-steps: Step S2021, obtaining the load voltage V and load current I of the motor to be tested, adding the load voltage and load current to the Y1 output terminal and the Y2 output terminal of the dual-trace oscilloscope respectively, adjusting the dual-trace oscilloscope until a stable waveform is displayed on the screen, reading the horizontal axis length L occupied by the waveform in a fixed period, and reading the interval Lr between the zero crossing points of the two waveforms; Using the formula Calculate the phase difference between the load current and the load voltage ; Step S2022, using formula Calculate and obtain the apparent power S of the motor to be tested; Then use the formula and formula Calculate the active power P and reactive power Q of the motor to be tested; Then through the formula and Calculate the active ratio YGB and reactive ratio WGB of the motor to be tested; Step S2023, if the active ratio of the motor to be tested is less than the preset active ratio or the reactive ratio is greater than the preset reactive ratio, a performance abnormality signal is generated, indicating that the motor to be tested is unqualified and no subsequent steps are required. If the active ratio of the motor to be tested is greater than or equal to the preset active ratio and the reactive ratio is less than or equal to the preset reactive ratio, the next step is entered, indicating that the power of the motor to be tested is qualified; wherein the preset active ratio and the preset reactive ratio are both percentages of fixed values, for example, the value of the preset active ratio is 95%, and the value of the preset reactive ratio is 5%. When the active ratio of the motor to be tested is 96% and the reactive ratio is 4%, the power of the motor to be tested is qualified; Step S2024, obtaining the running start time point and the running end time point of the motor to be tested, and obtaining the running time t of the motor to be tested by subtracting the running start time point from the running end time point of the motor to be tested; Using the formula Calculate the energy consumption E of the motor to be tested; Compare the energy consumption of the motor under test with the step energy consumption of the same model motor under the same test conditions; Step S2025, if the energy consumption of the motor to be tested is greater than the step energy consumption of the same model motor under the same test conditions, a performance abnormality signal is generated, indicating that the motor to be tested is unqualified and no subsequent steps are required; if the energy consumption of the motor to be tested is less than or equal to the step energy consumption of the same model motor under the same test conditions, it indicates that the motor to be tested is electrically qualified and enters the signal test phase; The signal test in step S2 includes the following sub-steps: Step S2031, obtaining the start signal sending time point and the end signal sending time point of the motor to be tested, subtracting the start signal sending time point from the operation start time point to obtain a signal receiving time length, and at the same time subtracting the end signal sending time point from the operation end time point to obtain another signal receiving time length, restarting and shutting down the motor to be tested n times to obtain 2n signal receiving time lengths; Step S2032, comparing the 2n-segment signal reception duration with the preset reception duration; If the reception durations of the 2n signal segments are all less than or equal to the preset reception duration, directly proceed to step S2034; If any signal reception duration is longer than the preset reception duration, the corresponding signal reception duration is calibrated as the signal delay duration, the number of signal delay durations is counted as the signal delay duration number, and the sum of all signal delay durations is divided by the signal delay duration number to obtain the average signal delay duration of the motor to be tested; Step S2033, comparing the average signal delay time of the motor to be tested with the standard signal delay time of the motor of the same model; If the average signal delay time of the motor to be tested is greater than the standard signal delay time of the motor of the same model, a signal abnormality signal is generated; if the average signal delay time of the motor to be tested is less than or equal to the standard signal delay time of the motor of the same model, the next step is entered; Step S2034, an external signal sending end is connected to the motor to be tested, and a signal receiving end that can synchronously acquire the signal received by the motor to be tested is set on the motor to be tested, and the signal sending end sends multiple segments of analog signals with known signal characteristics to the motor to be tested, and the signal receiving end synchronously acquires real-time signal characteristics of the multiple segments of analog signals; wherein the signal characteristics specifically include time, frequency, energy and information of the analog signals, and the known signal characteristics of each segment of the analog signals are different; Comparing the known signal characteristics of the analog signal sent by the signal sending end with the real-time signal characteristics of the corresponding analog signal obtained by the signal receiving end; If the known signal characteristics are consistent with the corresponding real-time signal characteristics, it means that the analog signal segment is received accurately, and the number of accurate receptions of the analog signal increases by one. If the known signal characteristics are inconsistent with the corresponding real-time signal characteristics, it means that the analog signal segment is inaccurate, and the number of accurate deviations of the analog signal increases by one. Step S2035, using formula Calculate the signal accuracy rate ZQL of the motor to be tested; where m is the total number of segments of the analog signal, and h is the number of accurate receptions of the analog signal; Step S2036, if the signal accuracy of the motor to be tested is less than the preset signal accuracy, a signal abnormality signal is generated; if the signal accuracy of the motor to be tested is greater than or equal to the preset signal accuracy, a signal normal signal is generated and the accuracy test phase is entered; The preset signal accuracy is a fixed value. For example, the preset signal accuracy is 96%. When the signal accuracy of the motor to be tested is 98%, the signal performance of the motor to be tested is qualified, and a normal signal is generated. Step S3, performing an accuracy test on the motor to be tested, and judging whether the accuracy of the motor to be tested is qualified based on the accuracy data; The accuracy data includes the position pictures of the threaded holes in the motor to be tested and the part dimensions of the components, including the rotor, stator, bearings and brackets; In this embodiment, step S3 includes the following sub-steps: Step S3011, taking position pictures of all threaded holes in the motor to be tested by using a sliding rod and a rotating table of the device; Step S3012, under the same shooting conditions, overlapping and comparing the position pictures of the threaded holes in the motor to be tested with the position pictures of the corresponding threaded holes in the motor of the same model; Step S3013, if the position picture of any threaded hole in the motor to be tested is different from the position picture of the corresponding threaded hole in the motor of the same model, an accuracy abnormality signal is generated; if the position pictures of all threaded holes in the motor to be tested are the same as the position pictures of the corresponding threaded holes in the motor of the same model, proceed to the next step; The analysis process of overlapping comparison analysis is specifically as follows: Stack the position pictures of the threaded holes in the motor to be tested with the position pictures of the corresponding threaded holes in the motor of the same model; Select the center point of any threaded hole as the origin to construct a three-dimensional coordinate system, and mark the threaded hole as the initial threaded hole; Calculate the real-time distance between the center points of all threaded holes and the center point of the initial threaded hole. Similarly, the standard distance between all threaded holes and the initial threaded hole in the same model motor can be obtained. If the real-time distance is not equal to the standard distance of the standard distance, an accuracy abnormality signal is generated; If the real-time distance is equal to the standard distance, the center point of the threaded hole and the outer diameter of the threaded hole are used to construct the real-time threaded area corresponding to each threaded hole. Similarly, the standard threaded area of ​​each threaded hole in the same model motor can be constructed, and the real-time threaded area is compared with the standard threaded area. If the real-time threaded areas of all threaded holes overlap with the corresponding standard threaded areas, the subsequent comparison step is entered. If the real-time threaded area of ​​any threaded hole does not overlap with the corresponding standard threaded area, an accuracy abnormality signal is generated; wherein, the overlap here means that the real-time threaded area and the corresponding standard threaded area are completely consistent, that is, there is no non-overlapping area between the real-time threaded area and the corresponding standard threaded area; Step S3014, measuring the dimensions of different components in the motor to be tested; wherein the components include but are not limited to the rotor, stator, bearing and shaft in the motor to be tested; Step S3015, comparing the sizes of different components in the motor to be tested with the standard sizes of corresponding components in the motor of the same model; Step S3016, if the part size of the component is consistent with the corresponding standard size, a qualified accuracy signal is generated; if the part size of any part is inconsistent with the corresponding standard size, an abnormal accuracy signal is generated; Step S4, the display terminal displays various test results of the motor to be tested, including the test results of the no-load test, the performance test and the accuracy test; In this application, if corresponding calculation formulas appear, the above calculation formulas are all dimensionless and take their numerical calculations. The weight coefficients, proportional coefficients and other coefficients in the formulas are set to a result value obtained by quantifying each parameter. The size of the weight coefficient and the proportional coefficient can be determined as long as it does not affect the proportional relationship between the parameter and the result value.

[0024] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A motor testing device, characterized in that: include; Before testing the motor, record the motor to be tested as the motor to be tested; A data acquisition unit, used to obtain no-load data, performance data and accuracy data during the test of the motor to be tested; The motor test module includes a no-load test unit, a performance test unit and an accuracy test unit; The no-load test unit is used to calculate the core loss and mechanical loss of the motor to be tested based on the no-load data, and determine whether the no-load test of the motor to be tested is qualified in combination with the core loss and mechanical loss. If it is unqualified, a no-load abnormal signal is generated; if it is qualified, a no-load normal signal is generated and the next test link is entered; A performance test unit is used to determine whether the motor to be tested is qualified according to the performance test. If it is unqualified, a performance abnormality signal is generated; if it is qualified, a performance normal signal is generated and the next test link is entered; The accuracy test unit is used to determine whether the test motor accuracy test is qualified according to the accuracy data, and generate an accuracy abnormality signal if it is unqualified, and generate a accuracy normal signal if it is qualified; The display terminal is used to display various test results of the motor to be tested.

2. A motor testing device according to claim 1, characterized in that: The no-load data includes the current and resistance flowing through the stator winding, the input power and speed of the motor to be tested, the number of pole pairs of the rotating magnetic field in the motor to be tested, the iron core, stator winding, and Steinmetz coefficient characterizing the magnetic medium in the motor to be tested, and the volume and peak magnetic induction intensity of the motor to be tested; The performance data includes the output voltage and output power of the power module, the model of the motor to be tested, the load voltage, load current, ground current, real-time voltage value, real-time motor temperature, operation start time point, operation end time point, start signal sending time point, end signal sending time point, and the insulation resistance value of the solid dielectric in the motor to be tested; The accuracy data includes pictures of the locations of threaded holes in the motor to be tested and the part dimensions of the components.

3. A motor testing method, characterized in that: In combination with the motor testing device according to any one of claims 1 to 2, the motor testing method is specifically as follows: Step S1, performing a no-load test on the motor to be tested, calculating the core loss and mechanical loss of the motor to be tested, and determining whether the motor to be tested is qualified based on the core loss and mechanical loss; Step S2, performing a performance test on the motor to be tested, calculating and analyzing the performance of the motor to be tested, and judging whether the performance of the motor to be tested is qualified based on the analysis result; Step S3, performing an accuracy test on the motor to be tested to determine whether the accuracy of the motor to be tested is qualified; Step S4: the display terminal displays various test results of the motor to be tested.

4. A motor testing method according to claim 3, characterized in that: The step S1 includes the following sub-steps: Obtain the stator current Ir flowing through the stator winding and the resistance R of the stator winding, and use the formula Calculate the stator copper loss PCu of the motor to be tested; Then, the input power Po of the motor to be tested is obtained, and the total loss of the motor to be tested is obtained by subtracting the stator copper loss of the motor to be tested from the input power of the motor to be tested. The total loss is the sum of the core loss and the mechanical loss. At the same time, obtain the speed n of the motor to be tested and the number of pole pairs p of the rotating magnetic field in the motor to be tested, and use the formula Calculate and obtain the power frequency f of the motor to be tested; Finally, the iron core, stator winding, Steinmetz coefficient characterizing the magnetic medium, volume and peak magnetic induction intensity B of the motor to be tested are obtained, and the formula is used The core loss PFe of the motor to be tested is calculated; wherein k is the Steinmetz coefficient of the core in the motor to be tested, a is the Steinmetz coefficient of the stator winding in the motor to be tested, and b is the Steinmetz coefficient representing the magnetic medium in the motor to be tested; Then the mechanical loss PMe of the motor to be tested is obtained by subtracting the core loss from the total loss; Using the formula and formula The core loss rate TSL and mechanical loss rate JSL of the motor to be tested are calculated respectively; If the core loss rate is greater than or equal to the core loss rate threshold or the mechanical loss rate is greater than or equal to the mechanical loss rate threshold, a no-load abnormal signal is generated; if the core loss rate is less than the core loss rate threshold and the mechanical loss rate is less than the mechanical loss rate threshold, a no-load normal signal is generated and the next test phase is entered.

5. A motor testing method according to claim 3, characterized in that: The performance test includes a withstand voltage test, an electrical test, and a signal test.

6. A motor testing method according to claim 5, characterized in that: The withstand voltage test in step S2 includes the following sub-steps: The power module provides load voltage and load power to the motor to be tested. First, the model of the motor to be tested is obtained, and the initial test voltage value, test voltage peak value and test duration of the motor to be tested are set according to the model. The motor to be tested is subjected to a withstand voltage test. The withstand voltage test sets the boost points on average according to the test duration. The interval between each two boost points is at least ten seconds and the voltage added at each boost point is the same. The withstand voltage test ends after the voltage increases to the test voltage peak value. Then, the real-time voltage value of the motor to be tested during the withstand voltage test is obtained, and the real-time voltage value is compared with the initial test voltage value and the real-time voltage value is compared with the test voltage peak value; If the real-time voltage value of the motor to be tested is lower than the initial test voltage value or the real-time voltage value is higher than the test voltage peak value, a performance abnormality signal is generated; if the real-time voltage value of the motor to be tested is higher than the initial test voltage value and the real-time voltage value is lower than the test voltage peak value, the output voltage and output power of the power module are obtained, the output voltage of the power module is compared with the standard voltage of the power module corresponding to the motor to be tested, and the output power of the power module is compared with the standard power of the power module corresponding to the motor to be tested; If the output voltage of the power module is less than the standard voltage of the motor to be tested corresponding to the power module or the output power of the power module is less than the standard power of the motor to be tested corresponding to the power module, a performance abnormality signal is generated; If the output voltage of the power module is greater than or equal to the standard voltage of the motor to be tested corresponding to the power module and the output power of the power module is greater than or equal to the standard power of the motor to be tested corresponding to the power module, then the real-time motor temperature of the motor to be tested at each boost point is obtained, and the real-time motor temperature of the motor to be tested at each boost point is compared with the standard maximum motor temperature of the same model motor under the same test conditions; If the real-time motor temperature of the motor under test at any two boost points is greater than the standard motor temperature of the same model motor under the same test conditions, a performance abnormality signal is generated; If the real-time motor temperature of the motor to be tested at all boost points is less than or equal to the standard motor temperature of the same model motor under the same test conditions, the ground current of the motor to be tested is obtained, and the ground current of the motor to be tested is compared with the standard ground current of the same model motor; If the ground current of the motor to be tested is greater than the standard ground current of the motor of the same model, a performance abnormality signal is generated; If the grounding current of the motor to be tested is equal to the standard grounding current of a motor of the same model, the insulation resistance value of the solid dielectric in the motor to be tested is obtained, and the insulation resistance value of the solid dielectric in the motor to be tested is compared with the insulation resistance value of a solid dielectric of the same material; If the insulation resistance value of the solid dielectric in the motor to be tested is not equal to the insulation resistance value of the solid dielectric of the same material, a performance abnormality signal is generated; If the insulation resistance value of the solid dielectric in the motor to be tested is equal to the insulation resistance value of the solid dielectric of the same material, the electrical test phase is entered.

7. A motor testing method according to claim 5, characterized in that: The electrical test in step S2 includes the following sub-steps: Obtain the load voltage V and load current I of the motor to be tested, add the load voltage and load current to the Y1 output terminal and Y2 output terminal of the dual-trace oscilloscope respectively, adjust the dual-trace oscilloscope until a stable waveform is displayed on the screen, read the horizontal axis length L occupied by the waveform in a fixed period, and read the interval Lr between the zero crossing points of the two waveforms; First, use the formula Calculate the phase difference between the load current and the load voltage ; Reuse formula Calculate and obtain the apparent power S of the motor to be tested; Then use the formula and formula Calculate the active power P and reactive power Q of the motor to be tested; Finally, the formula and Calculate the active ratio YGB and reactive ratio WGB of the motor to be tested; If the active ratio of the motor to be tested is less than the preset active ratio or the reactive ratio is greater than the preset reactive ratio, a performance abnormality signal is generated; If the active ratio of the motor to be tested is greater than or equal to the preset active ratio and the reactive ratio is less than or equal to the preset reactive ratio, the start time point and the end time point of the motor to be tested are obtained, and the running time t of the motor to be tested is obtained by subtracting the start time point from the end time point of the motor to be tested, and the formula is used to calculate the running time t of the motor to be tested. The energy consumption E of the motor to be tested is calculated, and the energy consumption of the motor to be tested is compared with the step energy consumption of the same model motor under the same test conditions; If the energy consumption of the motor under test is greater than the step energy consumption of a motor of the same model under the same test conditions, a performance abnormality signal is generated; If the energy consumption of the motor to be tested is less than or equal to the step energy consumption of the same model motor under the same test conditions, the signal test phase is entered.

8. A motor testing method according to claim 5, characterized in that: The signal test in step S2 includes the following sub-steps: Obtain the start signal sending time point and the end signal sending time point of the motor to be tested, subtract the start signal sending time point from the start time point of the operation to obtain a signal receiving time length, and at the same time subtract the end signal sending time point from the end time point of the operation to obtain another signal receiving time length, restart and shut down the motor to be tested n times to obtain 2n signal receiving time lengths; Compare the reception time of the 2n-segment signal with the preset reception time; If the reception duration of the 2n signal segments is less than or equal to the preset reception duration, proceed to the next step; If any signal reception duration is longer than the preset reception duration, the corresponding signal reception duration is calibrated as the signal delay duration, the number of signal delay durations is recorded as the signal delay duration number, the sum of all signal delay durations is added and divided by the signal delay duration number to obtain the average signal delay duration of the motor to be tested, the average signal delay duration of the motor to be tested is compared with the standard signal delay duration of the same model of motor, if the average signal delay duration of the motor to be tested is longer than the standard signal delay duration of the same model of motor, a signal abnormality signal is generated, if the average signal delay duration of the motor to be tested is less than or equal to the standard signal delay duration of the same model of motor, proceed to the next step; An external signal sending end is connected to the motor to be tested, and a signal receiving end that can synchronously acquire the signal received by the motor to be tested is arranged on the motor to be tested. The signal sending end sends a multi-segment analog signal with known signal characteristics to the motor to be tested, and the signal receiving end synchronously acquires the real-time signal characteristics of the multi-segment analog signal, and compares the known signal characteristics of the analog signal sent by the signal sending end with the real-time signal characteristics of the corresponding analog signal acquired by the signal receiving end. If the known signal characteristics are consistent with the corresponding real-time signal characteristics, the number of accurate receptions of the analog signal increases by one; if the known signal characteristics are inconsistent with the corresponding real-time signal characteristics, the number of accurate deviations of the analog signal increases by one; Using the formula Calculate the signal accuracy rate ZQL of the motor to be tested; where m is the total number of segments of the analog signal, and h is the number of accurate receptions of the analog signal; If the signal accuracy of the motor to be tested is less than the preset signal accuracy, a signal abnormality signal is generated; If the signal accuracy of the motor to be tested is greater than or equal to the preset signal accuracy, a normal signal is generated and the accuracy test phase is entered.

9. A motor testing method according to claim 3, characterized in that: The step S3 includes the following sub-steps: Take pictures of the locations of all threaded holes in the motor to be tested; Under the same shooting conditions, the position pictures of the threaded holes in the motor to be tested are overlapped and compared with the position pictures of the corresponding threaded holes in the motor of the same model; If the position picture of any threaded hole in the motor to be tested is different from the position picture of the corresponding threaded hole in the motor of the same model, an accuracy abnormality signal is generated; If the position pictures of all threaded holes in the motor to be tested are the same as the position pictures of the corresponding threaded holes in the motor of the same model, the part sizes of different components in the motor to be tested are measured, and the part sizes of different components in the motor to be tested are compared with the standard sizes of corresponding components in the motor of the same model. If the part sizes of the components are consistent with the corresponding standard sizes, a qualified accuracy signal is generated. If the part size of any component is inconsistent with the corresponding standard size, an abnormal accuracy signal is generated.

10. A motor testing method according to claim 9, characterized in that: in, The analysis process of overlapping comparison analysis is as follows: Stack the position pictures of the threaded holes in the motor to be tested with the position pictures of the corresponding threaded holes in the motor of the same model; Select the center point of any threaded hole as the origin to construct a three-dimensional coordinate system, and mark the threaded hole as the initial threaded hole; Calculate the real-time distance between the center point of all threaded holes and the center point of the initial threaded hole. Similarly, obtain the standard distance between all threaded holes and the initial threaded hole in the same model motor. If the real-time distance is not equal to the standard distance of the standard distance, an accuracy abnormality signal is generated; If the real-time distance is equal to the standard distance, the center point of the threaded hole and the outer diameter of the threaded hole are used to construct the real-time threaded area corresponding to each threaded hole. Similarly, the standard threaded area of ​​each threaded hole in the same model motor is constructed, and the real-time threaded area is compared with the standard threaded area. If the real-time threaded areas of all threaded holes overlap with the corresponding standard threaded areas, the subsequent comparison step is entered. If the real-time threaded area of ​​any threaded hole does not overlap with the corresponding standard threaded area, an accuracy exception signal is generated.

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