Test system for permanent magnet electric roller

Abstract

The invention provides a test system for a permanent magnet electric roller, and relates to the technical field of motor test. The system comprises a power supply subsystem, a measurement subsystem, a control subsystem and a special test bed for the permanent magnet electric roller, the power supply subsystem adopts a three-phase 380V power supply to supply power; the measuring subsystem forms a local area network by an industrial control computer, a server and various measuring instruments and meters; the control subsystem is composed of an industrial control computer and a controlled part, and centralized control and decentralized management are achieved through the industrial control computer. According to the invention, hardware measurement and control capabilities of equipment such as a computer and instruments and meters are combined together, and test control and data operation, analysis, processing and the like are realized through software, so that the performance detection capability of the permanent magnet electric roller is improved; whether the tested product meets the design requirement, the quality and the improvement target and direction can be judged according to the test result.

Description

Technical Field

[0001] The invention relates to the technical field of motor testing, and in particular to a testing system for a permanent magnet electric roller. Background Art

[0002] Since the actual output torque of the electric drum motor cannot be measured directly, it is difficult to accurately calculate the output power. In the past, the pressure was usually measured by installing a lever arm on the stator, and the torque was obtained by multiplying it by the length of the lever arm. The output power was converted according to the measured speed, and then a mechanical transmission efficiency was given based on experience to convert the final actual output power. This method has a complicated process, is inefficient for the performance test of the electric drum, and the actual efficiency of the tested electric drum motor has a large deviation.

[0003] Therefore, in order to achieve efficient and accurate testing of the performance of the electric roller, it is necessary to propose a test system for the electric roller. Summary of the invention

[0004] The purpose of the present invention is to provide a test system for a permanent magnet electric roller to solve the test problems of the permanent magnet electric roller in view of the above-mentioned deficiencies in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a test system for a permanent magnet electric roller, the system comprising: a power supply subsystem, a measurement subsystem, a control subsystem and a special test bench for a permanent magnet electric roller;

[0007] The power supply subsystem adopts a three-phase 380V power supply, which supplies power to the rectifier transformer through the power distribution cabinet, and the rectifier transformer supplies power to the AFE unit of the variable frequency power supply. After rectification, the AFE unit outputs two inverters, which are used as the power supply for the tested permanent magnet electric drum or the external electric drum dedicated inverter and the accompanying test motor respectively;

[0008] The measurement subsystem consists of an industrial control computer, a server, and a variety of measuring instruments and meters forming a local area network. During the test, the industrial control computer selects the corresponding measuring instruments and meters according to different test items, collects the data of the measuring instruments and meters in real time and saves them to the database. The test management software processes the test data to generate test reports and test curves.

[0009] The control subsystem consists of an industrial control computer and a controlled part, which realizes centralized control and decentralized management through the industrial control computer. The controlled part includes PLC, AC feedback system and related test instruments. The signal transmission of the control subsystem adopts Ethernet transmission.

[0010] The special test bench for permanent magnet electric roller includes a test motor, a loading roller, a redirecting roller, an angle roller, a tensioning roller, a belt, a belt corrector, a torque and speed sensor, a hydraulic pressure and its control system. During the test, the tested permanent magnet electric roller is placed on the test bench, the test motor is connected to the torque and speed sensor and then mechanically connected and fixed to the loading roller. The control cylinder of the angle roller is driven by the hydraulic system to change the belt angle on the tested permanent magnet electric roller. The control cylinder of the tensioning roller is adjusted to keep the belt in a tensioned state to prevent the belt from slipping. The tested permanent magnet electric roller drives the belt to run through the transmission roller and transmits it to the test motor. The belt correction device automatically corrects the belt, changes the output state of the test motor, and loads the tested permanent magnet electric roller. The detected electrical parameters and mechanical parameters are transmitted to the industrial control computer through the electrical parameter measurement system, the torque and speed sensor and its torque and speed tester.

[0011] Optionally, the variable frequency power supply adopts a low-voltage three-level topology 1140V mode, which can continuously and steplessly adjust the output voltage in the range of 0 to 1140V. When the tested permanent magnet electric roller or the external electric roller dedicated inverter drives the electric roller for load test, the inverter of the tested permanent magnet electric roller power supply branch runs in the motoring state, and the inverter of the accompanying motor power supply branch runs in the power generation state. The test energy circulates on the three-level DC bus, and the power grid compensates for the loss of the operating equipment in the system.

[0012] Optionally, the multiple measuring instruments and meters include a power analyzer, a torque and speed tester, an insulation withstand voltage tester, a DC resistance tester, a temperature patrol meter, a voltage sensor, a current sensor, and a torque and speed sensor.

[0013] Optionally, the operation of the control subsystem is completed on an industrial control computer, and the operations include closing and opening the test power supply, starting and stopping the test unit, selecting the current transformation ratio, setting and adjusting the load, and collecting and recording the test data.

[0014] Optionally, the motor efficiency of the tested permanent magnet motor drum is calculated as follows:

[0015] The tested permanent magnet electric drum is loaded by the test motor, and the input power P1 of the tested permanent magnet electric drum is measured. The output power P without belt loss is measured by the torque speed sensor. c ; The test motor does not run, and the input power P of the tested permanent magnet electric roller is tested 1a and the mechanical power P of the torque speed sensor c0 ; Loosen the belt, let the tested permanent magnet electric drum run without load, and test the no-load running power P0 of the tested permanent magnet electric drum;

[0016] The output power of the tested permanent magnet electric roller is corrected. The actual output power P2 of the tested permanent magnet electric roller is the belt loss △P p and the mechanical power P of the torque speed sensor c Sum: P2 = △P p +P c ;

[0017] Among them, the belt loss △P p =P 1a -P0-P c0 ;

[0018] Therefore, the motor efficiency η of the tested permanent magnet electric drum is: η=P2 / P1×100%.

[0019] The beneficial effects of the present invention include:

[0020] The test system of the permanent magnet electric roller provided by the present invention comprises: a power supply subsystem, a measuring subsystem, a control subsystem and a special test bench for the permanent magnet electric roller; the power supply subsystem adopts a three-phase 380V power supply, supplies power to the rectifier transformer through a power distribution cabinet, and the rectifier transformer supplies power to the AFE unit of the variable frequency power supply, and the AFE unit outputs 2 inverters after rectification, which are respectively used as the power supply for the tested permanent magnet electric roller or the special inverter for the external electric roller and the power supply for the accompanying test motor; the measuring subsystem is composed of an industrial control computer, a server, and a variety of measuring instruments and meters to form a local area network. During the test, according to different test items, the industrial control computer selects corresponding measuring instruments and meters, collects the data of the measuring instruments and meters in real time and saves them to the database, and the test management software processes the test data to generate a test report and a test curve; the control subsystem is composed of an industrial control computer and a controlled part, and centralized control and decentralized management are realized through the industrial control computer. The controlled part includes a PLC and an AC loop Feedback system and related test instruments, signal transmission of control subsystem adopts Ethernet transmission; the special test bench for permanent magnet electric roller includes test motor, loading roller, redirecting roller, angle roller, tensioning roller, belt, belt corrector, torque speed sensor, hydraulic and its control system. During the test, the tested permanent magnet electric roller is placed on the test bench, the test motor is connected to the torque speed sensor and then mechanically connected and fixed with the loading roller, the control cylinder of the angle roller is driven by the hydraulic system to change the belt angle on the tested permanent magnet electric roller, the control cylinder of the tensioning roller is adjusted to make the belt in a tightened state to prevent the belt from slipping, the tested permanent magnet electric roller drives the belt to run through the transmission roller and transmits it to the test motor, the belt correction device automatically corrects the belt, changes the output state of the test motor, loads the tested permanent magnet electric roller, and transmits the detected electrical parameters and mechanical parameters to the industrial control computer through the electrical parameter measurement system, torque speed sensor and its torque speed tester. This application improves the performance testing capability of the permanent magnet electric roller by combining the hardware measurement and control capabilities of computers and instruments and equipment, and realizing the control of the test and the calculation, analysis, and processing of data through software. According to the test results, it can be judged whether the tested product meets the design requirements, the quality, and the improvement goals and directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1The schematic diagram of the test system of the permanent magnet electric roller provided by the embodiment of the present invention is shown;

[0023] Figure 2 A schematic diagram of the bus structure of a measurement subsystem provided by an embodiment of the present invention is shown;

[0024] Figure 3 A schematic diagram of the bus structure of a control subsystem provided by an embodiment of the present invention is shown;

[0025] Figure 4 The structure diagram of the appearance of the permanent magnet electric roller dedicated test bench provided by the embodiment of the present invention is shown;

[0026] Figure 5 Shows Figure 4 The side view structural diagram of the permanent magnet electric roller dedicated test bench shown;

[0027] Figure 6 Shows Figure 4 The schematic diagram of the top view of the structure of the permanent magnet electric roller special test bench is shown. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0029] Since the actual output torque of the electric roller motor cannot be measured directly, the output power is difficult to calculate accurately. In the past, the pressure was usually measured by installing a lever arm on the stator, and the torque was obtained by multiplying it by the length of the lever arm. The output power was converted according to the measured speed, and then a mechanical transmission efficiency was given based on experience to convert the final actual output power. This method has a complicated process, is inefficient for the performance test of the electric roller, and the actual efficiency deviation of the tested electric roller motor is large. Therefore, in order to achieve efficient and accurate testing of the performance of the electric roller, it is necessary to propose a test system for the electric roller.

[0030] The test system for the permanent magnet electric roller provided by the present invention is a comprehensive product test system composed of a power supply system, a measurement and control system, and a special test bench for the permanent magnet electric roller.

[0031] Figure 1 The schematic diagram of the test system of the permanent magnet electric roller provided by the embodiment of the present invention is shown. The test system of the permanent magnet electric roller provided by the present invention comprises: a power supply subsystem, a measurement subsystem, a control subsystem and a special test bench for the permanent magnet electric roller.

[0032] The power supply subsystem adopts a three-phase 380V power supply, which supplies power to the rectifier transformer through the distribution cabinet, and the rectifier transformer supplies power to the AFE unit of the variable frequency power supply. After rectification, the AFE unit outputs two inverters, which are used as the power supply for the tested permanent magnet electric drum or the external electric drum dedicated inverter and the accompanying test motor respectively.

[0033] The variable frequency power supply adopts a low-voltage three-level topology 1140V mode, which can continuously and steplessly adjust the output voltage in the range of 0 to 1140V. When the tested permanent magnet electric roller or the external electric roller dedicated inverter drives the electric roller for load test, the inverter of the tested permanent magnet electric roller power supply branch runs in the motoring state, and the inverter of the accompanying motor power supply branch runs in the power generation state. The test energy circulates on the three-level DC bus, and the power grid compensates for the loss of the operating equipment in the system.

[0034] Specifically, in Figure 1 In the schematic diagram shown, from top to bottom, it includes grid input, input rectifier transformer, AFE rectifier unit, DC bus, inverter unit, filter unit, drum inverter measurement switching unit, measurement unit, output junction box and tow loading test unit.

[0035] Figure 2 The bus structure diagram of the measurement subsystem provided by the embodiment of the present invention is shown. The measurement subsystem is composed of an industrial control computer, a server, and a variety of measuring instruments and meters to form a local area network. During the test, according to different test items, the industrial control computer selects corresponding measuring instruments and meters, collects the data of the measuring instruments and meters in real time and saves them to the database, and the test management software processes the test data to generate a test report and a test curve.

[0036] All system data is automatically collected into the system through the data interface of related equipment. Data is collected locally to shorten the signal connection line, and the data is transmitted to the industrial computer via Ethernet or bus to ensure the accuracy and reliability of the data.

[0037] like Figure 2 As shown, the various measuring instruments and meters include power analyzers, torque and speed testers, insulation withstand voltage testers, DC resistance testers, temperature patrol meters and other instruments; the other instruments include voltage sensors (e.g., high-precision voltage sensors), current sensors (e.g., high-precision current sensors), and torque and speed sensors.

[0038] Figure 3The bus structure diagram of the control subsystem provided by the embodiment of the present invention is shown. The control subsystem is composed of an industrial control computer (or an operation console) and a controlled part. Centralized control and decentralized management are achieved through the industrial control computer. The controlled part includes a PLC (S7-1200 series) and an AC feedback system and related test instruments. The signal transmission of the control subsystem adopts Ethernet transmission, which effectively increases the anti-interference performance of the system. Optionally, the operation of the control subsystem is completed on the industrial control computer. The main contents of the operation include the closing and opening of the test power supply, the starting and stopping of the test unit, the selection of the current transformation ratio, the setting and adjustment of the load, the collection and recording of test data, etc. The control system software is written in a high-level language, the system operation is simple, the interface is concise and practical, and the style conforms to the industrial operation trend.

[0039] like Figures 4 to 6 As shown, the special test bench for permanent magnet electric roller includes a test motor, a loading roller, a redirecting roller, an angle roller, a tensioning roller, a belt, a belt corrector, a torque and speed sensor, a hydraulic pressure and its control system. During the test, the tested permanent magnet electric roller is placed on the test bench, the test motor is connected to the torque and speed sensor and then mechanically connected and fixed with the loading roller, the control cylinder of the angle roller is driven by the hydraulic system to change the belt angle on the tested permanent magnet electric roller, the control cylinder of the tensioning roller is adjusted to keep the belt in a tensioned state to prevent the belt from slipping, the tested permanent magnet electric roller drives the belt to run through the transmission roller and transmits it to the test motor, the belt correction device automatically corrects the belt, changes the output state of the test motor, loads the tested permanent magnet electric roller, and transmits the detected electrical parameters and mechanical parameters to the industrial control computer through the electrical parameter measurement system, the torque and speed sensor and its torque and speed tester.

[0040] In actual operation, the motor efficiency of the tested permanent magnet electric drum is calculated as follows: the tested permanent magnet electric drum is loaded with the accompanying motor, the input power P1 of the tested permanent magnet electric drum is measured, and the output power P1 excluding belt loss is measured with a torque speed sensor. c ; The test motor does not run, and the input power P of the tested permanent magnet electric roller is tested 1a and the mechanical power P of the torque speed sensor c0 ; Loosen the belt, let the tested permanent magnet electric drum run without load, and test the no-load running power P0 of the tested permanent magnet electric drum; correct the output power of the tested permanent magnet electric drum, and the actual output power P2 of the tested permanent magnet electric drum is the belt loss △P p and the mechanical power P of the torque speed sensor c Sum: P2 = △P p +P c ; Among them, belt loss △P p =P 1a -P0-Pc0 ; Therefore, the motor efficiency η of the tested permanent magnet electric roller is: η=P2 / P1×100%. This motor efficiency test method can test the motor efficiency more accurately, directly measure the output power through the torque speed sensor, and can realize the efficiency test of the electric roller motor without replacing and installing a special matching force arm. It is simple, fast, accurate and easy to implement.

[0041] In summary, this application combines the hardware measurement and control capabilities of computers and instruments and equipment, and realizes the control of the test and the calculation, analysis, and processing of data through software, thereby improving the performance detection capability of the permanent magnet electric roller, and the test is simple, fast, and accurate. The test system of the permanent magnet electric roller proposed in this application can perform a complete motor type test, and according to the test results of the permanent magnet electric roller type test, it can be judged whether the tested product meets the design requirements, the quality, and the improvement goals and directions.

[0042] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A test system for a permanent magnet electric roller, characterized in that: The system includes: a power supply subsystem, a measurement subsystem, a control subsystem and a special test bench for permanent magnet electric rollers; The power supply subsystem adopts a three-phase 380V power supply, supplies power to the rectifier transformer through the power distribution cabinet, and the rectifier transformer supplies power to the AFE unit of the variable frequency power supply. After rectification, the AFE unit outputs two inverters, which are used as the power supply for the tested permanent magnet electric roller or the external electric roller dedicated inverter and the accompanying test motor respectively; The measurement subsystem is composed of an industrial control computer, a server, and a variety of measuring instruments and meters to form a local area network. During the test, according to different test items, the industrial control computer selects the corresponding measuring instruments and meters, collects the data of the measuring instruments and meters in real time and saves them to the database, and the test management software processes the test data to generate a test report and test curve; The control subsystem is composed of an industrial control computer and a controlled part, which realizes centralized control and decentralized management through the industrial control computer. The controlled part includes a PLC, an AC feedback system and related test instruments. The signal transmission of the control subsystem adopts Ethernet transmission; The special test bench for permanent magnet electric roller comprises a test motor, a loading roller, a redirecting roller, an angle roller, a tensioning roller, a belt, a belt corrector, a torque and speed sensor, a hydraulic system and a control system thereof. During the test, the tested permanent magnet electric roller is placed on the test bench, the test motor is connected to the torque and speed sensor and then mechanically connected and fixed to the loading roller, the control cylinder of the angle roller is driven by the hydraulic system to change the belt angle on the tested permanent magnet electric roller, the control cylinder of the tensioning roller is adjusted to put the belt in a tensioned state to prevent the belt from slipping, the tested permanent magnet electric roller drives the belt to run through the transmission roller and transmits it to the test motor, the belt corrector automatically corrects the belt, changes the output state of the test motor, loads the tested permanent magnet electric roller, and transmits the detected electrical parameters and mechanical parameters to the industrial control computer through the electrical parameter measurement system, the torque and speed sensor and the torque and speed tester thereof.

2. The test system for the permanent magnet electric roller according to claim 1, characterized in that: The variable frequency power supply adopts a low-voltage three-level topology 1140V mode, which can continuously and steplessly adjust the output voltage in the range of 0 to 1140V. When the tested permanent magnet electric roller or the external electric roller dedicated inverter drives the electric roller for load test, the inverter of the tested permanent magnet electric roller power supply branch runs in the motoring state, and the inverter of the accompanying motor power supply branch runs in the power generation state. The test energy circulates on the three-level DC bus, and the power grid compensates for the loss of the operating equipment in the system.

3. The test system for the permanent magnet electric roller according to claim 1, characterized in that: The various measuring instruments and meters include a power analyzer, a torque and speed tester, an insulation withstand voltage tester, a DC resistance tester, a temperature inspection instrument, a voltage sensor, a current sensor, and a torque and speed sensor.

4. The test system for the permanent magnet electric roller according to claim 1, characterized in that: The operation of the control subsystem is completed on the industrial control computer, and the operation includes closing and opening of the test power supply, starting and stopping of the test unit, selection of current transformation ratio, setting and adjustment of load, and collection and recording of test data.

5. The test system for the permanent magnet electric roller according to claim 1, characterized in that: The calculation method of the motor efficiency of the tested permanent magnet electric drum is as follows: The tested permanent magnet electric drum is loaded by the test motor, and the input power P1 of the tested permanent magnet electric drum is measured. The output power P without belt loss is measured by the torque speed sensor. c ; The test motor does not run, and the input power P of the tested permanent magnet electric roller is tested 1a and the mechanical power P of the torque speed sensor c0 ; Loosen the belt, let the tested permanent magnet electric drum run without load, and test the no-load running power P0 of the tested permanent magnet electric drum; The output power of the tested permanent magnet electric roller is corrected. The actual output power P2 of the tested permanent magnet electric roller is the belt loss △P p and the mechanical power P of the torque speed sensor c Sum: P2 = △P p +P c ; Among them, the belt loss △P p =P 1a -P0-P c0 ; Therefore, the motor efficiency η of the tested permanent magnet electric drum is: η=P2 / P1×100%.

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