A magnetic field modulation gear transmission performance testing method and system

Abstract

The present invention provides a method and system for testing the transmission performance of a magnetic field modulation gear. The system includes: a first frequency converter, a first drive motor, a first torque-speed tester, a magnetic field modulation gear, a second frequency converter, a second drive motor, and a second torque-speed tester. The first drive motor, the first torque-speed tester, the magnetic field modulation gear, the second torque-speed tester, and the second drive motor are coaxially arranged. One end of the first frequency converter is connected to the power grid and the other end is connected to the first drive motor. One end of the second frequency converter is connected to the power grid and the other end is connected to the second drive motor. The first frequency converter and the second frequency converter are connected via a DC bus. The speed of the first drive motor is greater than the speed of the second drive motor. The testing system is used to perform torque limit testing and speed limit testing on the magnetic field modulation gear. The present invention can test the performance of high-power, high-modulation-ratio magnetic field modulation gears.

Description

Technical Field

[0001] The present invention relates to the field of electric transmission testing, and in particular to a method and system for testing the transmission performance of a magnetic field modulation gear. Background Art

[0002] Magnetic field modulation gear is a mechanical device that uses magnetic field coupling to transmit power. It can achieve contactless transmission and has the advantages of low vibration and noise, no need for lubrication and automatic overload protection. It also has a high transmission torque density. Therefore, it has broad application prospects in the fields of aircraft engines, ship propulsion and new energy vehicles.

[0003] The current method for testing the transmission performance of magnetic field modulation gears is mainly to drive the motor with a magnetic powder brake or a load motor, place the magnetic field modulation gear between the two, and connect the input and output ends of the magnetic field modulation gear to speed and torque testers respectively. All equipment and instruments are coaxially connected, and then the transmission performance of the magnetic field modulation gear, such as power, torque and efficiency, is tested.

[0004] The aforementioned test method is suitable for small and medium-sized magnetic field modulation gears. However, transmission performance testing for large magnetic field modulation gears, especially those with power ranging from several hundred kilowatts to several megawatts and large modulation ratios, is extremely difficult. This is because high-power level testing places extremely high demands on the drive equipment, test instruments, and load terminals, as well as on the test site and power transformer capacity. In cases of high modulation, especially when the modulation ratio exceeds ten times, the drive equipment of the magnetic field modulation gear requires a higher speed and lower torque, while the load terminal needs to provide higher torque and lower speed. This means that at high power levels, the drive and load equipment of the magnetic field modulation gear will experience a large torque and speed difference, which greatly increases the difficulty of equipment selection, use, and connection, and the testing cost is very high. Therefore, the development of a test method for high-power, high-modulation-ratio magnetic field modulation gears under laboratory conditions is particularly important. Summary of the Invention

[0005] In view of the above technical problems, the technical solution adopted by the present invention is:

[0006] According to a first aspect of the present invention, a magnetic field modulation gear transmission performance test system is provided, the test system comprising: a first frequency converter, a first drive motor, a first torque-speed tester, a magnetic field modulation gear, a second frequency converter, a second drive motor and a second torque-speed tester, the first drive motor, the first torque-speed tester, the magnetic field modulation gear, the second torque-speed tester and the second drive motor are coaxially arranged, one end of the first frequency converter is connected to the power grid, and the other end is connected to the first drive motor, one end of the second frequency converter is connected to the power grid, and the other end is connected to the second drive motor, the first frequency converter and the second frequency converter are connected via a DC bus, and the speed of the first drive motor is greater than the speed of the second drive motor; the test system is used to test the magnetic field modulation gear transmission performance. The gear is subjected to torque limit test and speed limit test to test the transmission performance of the magnetic field modulation gear, wherein, during the torque limit test, the first drive motor, the first torque and speed tester, the magnetic field modulation gear, the second torque and speed tester and the second drive motor are in a connected state, the input speed of the magnetic field modulation gear is less than the input rated speed of the magnetic field modulation gear, and the output torque of the magnetic field modulation gear is greater than the output rated torque of the magnetic field modulation gear; during the speed limit test, the first drive motor, the first torque and speed tester, the magnetic field modulation gear and the second torque and speed tester are in a connected state, the second torque and speed tester and the second drive motor are in a disengaged state, and the input speed of the magnetic field modulation gear is greater than the input rated speed of the magnetic field modulation gear.

[0007] According to a second aspect of the present invention, a method for testing the transmission performance of a magnetic field modulation gear is provided, the method comprising the following steps:

[0008] S300, torque limit test for magnetic field modulated gears.

[0009] S400, speed limit test for field modulated gears.

[0010] Among them, the torque limit test and the speed limit test are implemented based on a test system, and the test system includes a first frequency converter, a first drive motor, a first torque and speed tester, a magnetic field modulation gear, a second frequency converter, a second drive motor and a second torque and speed tester. The first drive motor, the first torque and speed tester, the magnetic field modulation gear, the second torque and speed tester and the second drive motor are coaxially arranged, one end of the first frequency converter is connected to the power grid, and the other end is connected to the first drive motor, one end of the second frequency converter is connected to the power grid, and the other end is connected to the second drive motor, the first frequency converter and the second frequency converter are connected through a DC bus, and the speed of the first drive motor is greater than that of the second frequency converter. The speed of the two drive motors; wherein, during the torque limit test, the first drive motor, the first torque speed tester, the magnetic field modulation gear, the second torque speed tester and the second drive motor are in a connected state, the input speed of the magnetic field modulation gear is less than the input rated speed of the magnetic field modulation gear, and the output torque of the magnetic field modulation gear is greater than the output rated torque of the magnetic field modulation gear. During the speed limit test, the first drive motor, the first torque speed tester, the magnetic field modulation gear and the second torque speed tester are in a connected state, the second torque speed tester and the second drive motor are in a disengaged state, and the input speed of the magnetic field modulation gear is greater than the input rated speed of the magnetic field modulation gear.

[0011] The present invention has at least the following beneficial effects:

[0012] The magnetic field modulation gear transmission performance testing method and system provided by the embodiments of the present invention can test the transmission performance of a high-power and high-modulation-ratio magnetic field modulation gear under laboratory conditions.

[0013] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.

[0015] Figure 1 A structural block diagram of a magnetic field modulation gear transmission performance testing system provided by an embodiment of the present invention;

[0016] Figure 2 This is a flow chart of a magnetic field modulation gear transmission performance testing method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0019] It should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the steps as sequential processes, many of the steps can be performed in parallel, concurrently, or simultaneously. In addition, the order of the steps can be rearranged. A process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. A process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0020] An embodiment of the present invention provides a magnetic field modulation gear transmission performance testing system, which is intended to be able to test the transmission performance of a high-power and high-modulation-ratio magnetic field modulation gear under experimental conditions.

[0021] In an embodiment of the present invention, the power P of the magnetic field modulation gear satisfies the following conditions: P1≤P≤P2, P1 is the first set power threshold, P2 is the second set power threshold, P1>100KW, 1MW<P2<10MW, and the modulation ratio of the magnetic field modulation gear is greater than 1:10, that is, the power (input power and output power) of the magnetic field modulation gear tested in an embodiment of the present invention can reach hundreds of kilowatts to several megawatts, and the modulation ratio is above 1:10.

[0022] The basic principle of the transmission performance test of magnetic field modulation gears is that magnetic field modulation gears are different from conventional electrical power equipment. As transmission components, their performance indicators are mainly tested including torque, speed and efficiency tests. The torque transmission capacity of magnetic field modulation gears mainly examines its breaking torque. If the rated load is added, even if the output speed does not reach the rated, but there is no loss of step, it can be verified that the designed rated torque does not reach the breaking torque, and its ability to reach the output rated torque can be verified. The amount of power transmitted by the magnetic field modulation gear and the amount of loss are directly determined by the input speed and output speed of the magnetic field modulation gear. If the speed is added to the rated speed, even if the input torque and output torque do not reach the rated torque, but it can run stably for a long time, such as several hours continuously, and the corresponding efficiency value is calculated by the loss analysis method, it can be tested whether its efficiency when reaching the rated power and the overall dynamic characteristics and mechanical strength characteristics at high speed meet the requirements.

[0023] like Figure 1 As shown, the magnetic field modulation gear transmission performance testing system provided by an embodiment of the present invention may include: a first frequency converter 1, a first drive motor 2, a first torque and speed tester 3, a magnetic field modulation gear 4, a second frequency converter 5, a second torque and speed tester 6 and a second drive motor 7.

[0024] The first drive motor 2, first torque-speed tester 3, magnetic field modulation gear 4, second torque-speed tester 6, and second drive motor 7 are coaxially arranged. Specifically, they can be coaxially fixed to a test platform and aligned using a high-precision concentricity tester to ensure that the multiple coaxial connection components have sufficient concentricity, such as an offset within 0.02 mm. The drive motor and torque-speed tester can be connected via a connecting structure such as a coupling.

[0025] In an embodiment of the present invention, the speed of the first drive motor 2 is greater than the speed of the second drive motor 7, that is, the first drive motor is a high-speed motor and the second drive motor is a low-speed motor. The speed of the high-speed motor can be 20,000 rpm and the speed of the low-speed motor can be 2,000 rpm. In an embodiment of the present invention, the first drive motor and the second drive motor can both be permanent magnet motors.

[0026] Furthermore, one end of the first frequency converter 1 is connected to the power grid 9 of the test site, and the other end is connected to the first drive motor 2. One end of the second frequency converter 5 is connected to the power grid 9, and the other end is connected to the second drive motor 7. The first frequency converter and the second frequency converter are connected via a DC bus 8. The first frequency converter, the first drive motor, and the first torque and speed tester constitute the drive side, while the second frequency converter, the second drive motor, and the second torque and speed tester constitute the load side. The first frequency converter 1 is used to control the speed of the first drive motor 2, and the second frequency converter 5 is used to control the torque of the second drive motor 7. The first inverter drives the first drive motor to rotate, and the magnetic field modulation gear drives the second drive motor to rotate to generate electricity. When generating electricity, the second drive motor is equivalent to being in an energy-consuming braking state, with the braking torque acting as the load. The generated electricity flows into the DC bus through the inverter, and then the generated electricity is fed back to the first inverter to provide driving power to the first drive motor, completing the cyclic conversion of electromagnetic power and mechanical power. At this time, even if both motors output according to the rated state, the overall grid power consumed is only the loss part of the two motors. The high efficiency of permanent magnet motors can greatly reduce the requirements for the grid capacity of the test site.

[0027] Furthermore, the test system provided by the embodiment of the present invention is used to perform torque limit test and speed limit test on the magnetic field modulation gear to test the transmission performance of the magnetic field modulation gear, wherein, during the torque limit test, the first drive motor, the first torque and speed tester, the magnetic field modulation gear, the second torque and speed tester and the second drive motor are in a connected state, the input speed of the magnetic field modulation gear is less than the input rated speed of the magnetic field modulation gear, and the output torque of the magnetic field modulation gear is greater than the output rated torque of the magnetic field modulation gear; during the speed limit test, the first drive motor, the first torque and speed tester, the magnetic field modulation gear and the second torque and speed tester are in a connected state, the second torque and speed tester and the second drive motor are in a disengaged state, that is, the magnetic field modulation gear is in a no-load state, and the input speed of the magnetic field modulation gear is greater than the input rated speed of the magnetic field modulation gear.

[0028] In an embodiment of the present invention, when performing a torque limit test, the torque of the load permanent magnet motor is adjusted to achieve the rated output torque of the high-power, high-modulation ratio magnetic field modulation gear, but the speed of the first drive motor, i.e., the driving permanent magnet motor, is reduced. At this time, the speed on the load side is reduced according to the corresponding modulation ratio. Then, the magnetic field modulation gear operates at a lower power level while ensuring sufficient output torque, thereby verifying its output capacity while reducing the demand for test system equipment and instruments. In addition, when performing a speed limit test, the high-power, high-modulation ratio magnetic field modulation gear is placed in an unloaded state, i.e., disconnected from the second drive motor, i.e., the load permanent magnet motor, and the speed of the driving permanent magnet motor is adjusted to achieve the input rated speed of the high-power, high-modulation ratio magnetic field modulation gear. At this time, the speed on the load side is the output speed at the rated modulation ratio, i.e., the output rated speed. However, due to being in an unloaded state, the operating power is at an extremely low level. The loss of the magnetic field modulation gear is directly related to the speed. Therefore, while verifying its efficiency and operating stability under the rated state, the demand for test system equipment and instruments is significantly reduced.

[0029] Furthermore, the torque limit test process may include the following steps:

[0030] S110, based on the grid capacity and the rated torque of the second drive motor, determine the input speed of the magnetic field modulation gear as the test speed, and send a control instruction to the first inverter to instruct the first inverter to control the speed of the first drive motor to be the test speed.

[0031] In an embodiment of the present invention, the input speed is set to ensure that the power required during the test does not exceed the grid capacity of the test site. In an exemplary embodiment, the input speed may meet the following conditions:

[0032] [(n in / K)×T N ] / 9550×0.25≤C×a;n in is the test speed, T N is the rated torque of the second drive motor, C is the grid capacity, a is a preset coefficient, 0<a<1, K is the modulation ratio of the magnetic field modulation gear, and [] indicates rounding. In an exemplary embodiment, 0.5≤a≤0.8.

[0033] S120, the first inverter controls the first drive motor to output a corresponding test speed based on the received control instruction, and the second inverter controls the torque of the second drive motor to increase from the initial torque to the rated torque according to the set torque increase value.

[0034] In the embodiment of the present invention, the initial torque may be 0. The set torque increase value may be h1 times the rated torque, that is, h1×T is increased each time. N, the value of h1 is 0.1 to 0.2. In a preferred embodiment, h1 = 0.1, and in another preferred embodiment, h2 = 0.2.

[0035] S130, obtain the current first torque and the current first speed collected by the first torque-speed tester and the current second speed and the current second torque collected by the second torque-speed tester, and apply the obtained current first torque, current first speed, current second torque and current second speed to the simulation model of the magnetic field modulation gear for simulation analysis to obtain the corresponding first simulation result, and apply the rated output torque and rated input speed of the magnetic field modulation gear to the simulation model of the magnetic field modulation gear for simulation analysis to obtain the corresponding second simulation result.

[0036] In an embodiment of the present invention, the simulation model and simulation results of the magnetic field modulation gear can be obtained using existing finite element simulation software. The simulation results can include stress fields and dynamic analysis results of various structural components corresponding to the magnetic field modulation gear, such as stress intensity and deformation.

[0037] S140 , if the difference between the first simulation result and the second simulation result is within a preset range, the current torque of the second drive motor is used as the limit torque and S160 is executed; otherwise, S150 is executed.

[0038] In an embodiment of the present invention, the preset range may be determined based on the second simulation result, for example, it may be a few thousandths of the second simulation result, such as one thousandth or five thousandths.

[0039] S150, using the second inverter to control the current torque of the second drive motor to increase the set torque; executing S130.

[0040] In the embodiment of the present invention, the set torque can be h2×T N , the value of h2 can be 1% to 10% of the rated torque.

[0041] S160, controlling the first drive motor to output a test speed and controlling the second drive motor to output a limit torque to perform a torque limit test on the magnetic field modulation gear. If the magnetic field modulation gear is in a stable state, determining that the performance of the magnetic field modulation gear is in a first performance state; otherwise, it is in a second performance state.

[0042] In the embodiments of the present invention, a stable state refers to a stable output without noticeable abnormal noise, large vibration, or deformation. The first performance state indicates that the transmission performance of the magnetic field modulation gear is normal, and the second performance state indicates that the transmission performance of the magnetic field modulation gear is abnormal.

[0043] In an embodiment of the present invention, since the dynamic characteristics and mechanical strength characteristics of the magnetic field modulation gear under the rated working state, as well as the dynamic characteristics and mechanical strength characteristics under rated torque and low speed are simulated by finite element simulation during the torque test, corrections are made after comparing the differences, and the rated torque at low speed is increased to meet the dynamic characteristics and mechanical strength characteristics under the rated state. The increased torque is used as the limit output torque during the test, and the test is performed again in this state, which can more accurately verify the ability of the magnetic field modulation gear to output torque when running at full load.

[0044] Furthermore, the speed limit test process may include the following steps:

[0045] S210 , using a first inverter to control the speed of the first drive motor to increase from an initial speed to a rated speed of the first drive motor according to a set speed increase value.

[0046] In the embodiment of the present invention, the initial speed may be 0. The set speed increase value may be the rated speed n N k times, that is, each time h1×n is increased N .

[0047] S220, obtain the current first torque and current first speed collected by the first torque-speed tester and the current second speed and current second torque collected by the second torque-speed tester, and apply the obtained current first torque, current first speed, current second torque and current second speed to the simulation model of the magnetic field modulation gear for simulation analysis to obtain the corresponding first simulation result, and apply the rated output torque and rated input speed of the magnetic field modulation gear to the simulation model of the magnetic field modulation gear for simulation analysis to obtain the corresponding second simulation result.

[0048] S230 , if the difference between the first simulation result and the second simulation result is within a preset range, the current rotation speed of the first drive motor is used as the limit rotation speed and S250 is executed; otherwise, S240 is executed.

[0049] S240: Utilize the first frequency converter to control the current speed of the first drive motor to increase to a set speed; and execute S220.

[0050] In the embodiment of the present invention, the set speed can be h1×n N .

[0051] S250, controlling the first drive motor to output a limit speed to perform a speed limit test on the magnetic field modulation gear. If the magnetic field modulation gear is in a stable state, determining that the performance of the magnetic field modulation gear is in a first performance state; otherwise, determining that the performance of the magnetic field modulation gear is in a second performance state.

[0052] In the embodiment of the present invention, during the speed test, the dynamic characteristics and mechanical strength characteristics of the magnetic field modulation gear at the rated speed and no-load state are simulated by finite element simulation, and the dynamic characteristics and mechanical strength characteristics simulation results of the magnetic field modulation gear at the rated working state are compared and corrected. While maintaining the no-load state, the speed is increased so that it meets the dynamic characteristics and mechanical strength characteristics of the rated state. The increased speed is used as the limit speed during the test, and the test is performed again in this state. This can more accurately verify the efficiency and operating stability of the magnetic field modulation gear when running at full load. In summary, the magnetic field modulation gear transmission performance testing system provided by the embodiment of the present invention, in actual application, uses the finite element simulation method to perform an equivalent separation test on the rated operating condition at a power level lower than the rated power. By testing the torque limit at low speed and the speed limit at no-load, the rated output performance of the high-power and high-modulation ratio magnetic field modulation gear can be tested under laboratory conditions. At the same time, this method can be extended to the rated output performance test of magnetic field modulation gears of larger power levels, which can reduce the testing difficulty and testing cost of large magnetic field modulation gears.

[0053] Based on the same inventive concept, the embodiment of the present invention also provides a magnetic field modulation gear transmission performance testing method, such as Figure 2 As shown, the method includes the following steps:

[0054] S300, torque limit test for magnetic field modulated gears.

[0055] S400, speed limit test for field modulated gears.

[0056] The torque limit test and the speed limit test are implemented based on a test system, which includes a first frequency converter, a first drive motor, a first torque-speed tester, a magnetic field modulation gear, a second frequency converter, a second drive motor and a second torque-speed tester. The first drive motor, the first torque-speed tester, the magnetic field modulation gear, the second torque-speed tester and the second drive motor are coaxially arranged. One end of the first frequency converter is connected to the power grid, and the other end is connected to the first drive motor. One end of the second frequency converter is connected to the power grid, and the other end is connected to the second drive motor. The first frequency converter and the second frequency converter are connected through a DC bus. The speed of the first drive motor is greater than that of the second drive motor. The speed of the motor; wherein, during the torque limit test process, the first drive motor, the first torque-speed tester, the magnetic field modulation gear, the second torque-speed tester and the second drive motor are in a connected state, the input speed of the magnetic field modulation gear is less than the input rated speed of the magnetic field modulation gear, and the output torque of the magnetic field modulation gear is greater than the output rated torque of the magnetic field modulation gear. During the speed limit test process, the first drive motor, the first torque-speed tester, the magnetic field modulation gear and the second torque-speed tester are in a connected state, the second torque-speed tester and the second drive motor are in a disengaged state, and the input speed of the magnetic field modulation gear is greater than the input rated speed of the magnetic field modulation gear.

[0057] Furthermore, S300 specifically includes the following steps:

[0058] S310, based on the grid capacity and the rated torque of the second drive motor, determine the input speed of the magnetic field modulation gear as the test speed, and send a control instruction to the first inverter to instruct the first inverter to control the speed of the first drive motor to be the test speed.

[0059] S320, the first inverter controls the first drive motor to output a corresponding test speed based on the received control instruction, and the second inverter controls the torque of the second drive motor to increase from the initial torque to the rated torque according to the set torque increase value.

[0060] S330, obtain the current first torque and current first speed collected by the first torque-speed tester and the current second speed and current second torque collected by the second torque-speed tester, and apply the obtained current first torque, current first speed, current second torque and current second speed to the simulation model of the magnetic field modulation gear for simulation analysis to obtain the corresponding first simulation result, and apply the rated output torque and rated input speed of the magnetic field modulation gear to the simulation model of the magnetic field modulation gear for simulation analysis to obtain the corresponding second simulation result.

[0061] S340 , if the difference between the first simulation result and the second simulation result is within a preset range, the current torque of the second drive motor is used as the limit torque and S360 is executed; otherwise, S350 is executed.

[0062] S350, using the second inverter to control the current torque of the second drive motor to increase the set torque; executing S330.

[0063] S360, controls the first drive motor to output a test speed and controls the second drive motor to output a limit torque to perform a torque limit test on the magnetic field modulation gear. If the magnetic field modulation gear is in a stable state, determines that the performance of the magnetic field modulation gear is in the first performance state; otherwise, it is in the second performance state.

[0064] Furthermore, S400 specifically includes the following steps:

[0065] S410: Using a first inverter, the speed of the first drive motor is controlled to increase from an initial speed to a rated speed of the first drive motor according to a set speed increase value.

[0066] S420, obtain the current first torque and current first speed collected by the first torque-speed tester and the current second speed and current second torque collected by the second torque-speed tester, and apply the obtained current first torque, current first speed, current second torque and current second speed to the simulation model of the magnetic field modulation gear for simulation analysis to obtain the corresponding first simulation result, and apply the rated output torque and rated input speed of the magnetic field modulation gear to the simulation model of the magnetic field modulation gear for simulation analysis to obtain the corresponding second simulation result.

[0067] S430 , if the difference between the first simulation result and the second simulation result is within a preset range, the current rotation speed of the first drive motor is used as the limit rotation speed and S450 is executed; otherwise, S440 is executed.

[0068] S440: Use the first inverter to control the current speed of the first drive motor to increase the set speed; execute S420.

[0069] S450, controlling the first drive motor to output a limit speed to perform a speed limit test on the magnetic field modulation gear. If the magnetic field modulation gear is in a stable state, determining that the performance of the magnetic field modulation gear is in a first performance state; otherwise, determining that the performance of the magnetic field modulation gear is in a second performance state.

[0070] In an embodiment of the present invention, the following steps are also included:

[0071] S500, tests the efficiency of magnetic field modulation gears.

[0072] S500 may include the following steps:

[0073] S510 , obtaining input speeds and input torques at different speeds recorded by the first torque and speed tester during the speed limit test as basic data.

[0074] During the speed limit test, when the first drive motor changes from 0 to the speed limit, the first torque-speed tester records the input speed and input torque corresponding to each speed.

[0075] S520: Based on the acquired basic data, the total power loss of the magnetic field modulation gear at different speeds is acquired.

[0076] Those skilled in the art know that the input mechanical power is equal to the product of the input speed and the input torque divided by 9550. According to the principle of conservation of energy, the input mechanical power under no-load is the total power loss of the magnetic field modulation gear.

[0077] S530, assuming that during the speed limit test, the magnetically modulated gears all operate with rated loads, and based on this assumption, obtaining output power at different speeds.

[0078] In the embodiment of the present invention, the output power is equal to the product of the output speed and the rated torque divided by 9550.

[0079] S540 : Obtain corresponding efficiency values ​​based on the total power loss and output power corresponding to different rotational speeds.

[0080] In the embodiment of the present invention, the efficiency value is equal to the output power divided by the input power. In the embodiment of the present invention, the input power of the magnetic modulation gear when operating with a rated load is obtained by theoretically calculating the total power loss obtained from the speed limit test, assuming the rated load. That is, the input power of the magnetic modulation gear when operating with a rated load is equal to the total power loss plus the output power.

[0081] S550: Based on the efficiency values ​​corresponding to different rotational speeds, obtain an efficiency curve corresponding to the magnetic modulation gear and an efficiency value at a rated point.

[0082] The method provided in this embodiment can be implemented by the system provided in the above-mentioned embodiment, and will not be described again to avoid redundancy.

[0083] An embodiment of the present invention also provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are configured to execute the method described in the embodiment of the present invention.

[0084] An embodiment of the present invention further provides a non-transitory computer-readable storage medium storing computer-executable instructions, wherein the computer instructions are used to execute the method described in the embodiment of the present invention.

[0085] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present invention can be achieved. This is not limited herein.

[0086] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A magnetic field modulation gear transmission performance testing system, characterized in that: The test system includes: a first frequency converter, a first drive motor, a first torque and speed tester, a magnetic field modulation gear, a second frequency converter, a second drive motor and a second torque and speed tester. The first drive motor, the first torque and speed tester, the magnetic field modulation gear, the second torque and speed tester and the second drive motor are coaxially arranged. One end of the first frequency converter is connected to the power grid and the other end is connected to the first drive motor. One end of the second frequency converter is connected to the power grid and the other end is connected to the second drive motor. The first frequency converter and the second frequency converter are connected via a DC bus. The speed of the first drive motor is greater than the speed of the second drive motor. The test system is used to perform torque limit test and speed limit test on the magnetic field modulation gear. A test is performed to test the transmission performance of the magnetic field modulation gear, wherein during the torque limit test, the first drive motor, the first torque and speed tester, the magnetic field modulation gear, the second torque and speed tester, and the second drive motor are in a connected state, the input speed of the magnetic field modulation gear is less than the input rated speed of the magnetic field modulation gear, and the output torque of the magnetic field modulation gear is greater than the output rated torque of the magnetic field modulation gear; during the speed limit test, the first drive motor, the first torque and speed tester, the magnetic field modulation gear, and the second torque and speed tester are in a connected state, the second torque and speed tester and the second drive motor are in a disconnected state, and the input speed of the magnetic field modulation gear is greater than the input rated speed of the magnetic field modulation gear; The speed limit test process includes the following steps: S210, using a first frequency converter to control the speed of the first drive motor to increase from an initial speed to a rated speed of the first drive motor according to a set speed increase value; S220, obtaining a current first torque and a current first speed collected by the first torque and speed tester, and a current second speed and a current second torque collected by the second torque and speed tester, and applying the obtained current first torque, current first speed, current second torque, and current second speed to a simulation model of the magnetic field modulation gear for simulation analysis to obtain a corresponding first simulation result, and applying the rated output torque and rated input speed of the magnetic field modulation gear to the simulation model of the magnetic field modulation gear for simulation analysis to obtain a corresponding second simulation result; S230: If the difference between the first simulation result and the second simulation result is within a preset range, the current speed of the first drive motor is used as the limit speed and S250 is executed; otherwise, S240 is executed; S240, using the first inverter to control the current speed of the first drive motor to increase the set speed; executing S220; S250, controlling the first drive motor to output a limit speed to perform a speed limit test on the magnetic field modulation gear. If the magnetic field modulation gear is in a stable state, determining that the performance of the magnetic field modulation gear is in a first performance state; otherwise, determining that the performance of the magnetic field modulation gear is in a second performance state.

2. The system according to claim 1, wherein: The torque limit test process includes the following steps: S110, based on the grid capacity and the rated torque of the second drive motor, determining the input speed of the magnetic field modulation gear as a test speed, and sending a control instruction to the first inverter to instruct the first inverter to control the speed of the first drive motor to the test speed; S120, based on the received control instruction, the first inverter controls the first drive motor to output a corresponding test speed, and the second inverter controls the torque of the second drive motor to increase from the initial torque to the rated torque according to the set torque increase value; S130, obtaining a current first torque and a current first speed collected by the first torque and speed tester, and a current second speed and a current second torque collected by the second torque and speed tester, and applying the obtained current first torque, current first speed, current second torque, and current second speed to a simulation model of the magnetic field modulation gear for simulation analysis to obtain a corresponding first simulation result, and applying the rated output torque and rated input speed of the magnetic field modulation gear to the simulation model of the magnetic field modulation gear for simulation analysis to obtain a corresponding second simulation result; S140, if the difference between the first simulation result and the second simulation result is within a preset range, taking the current torque of the second drive motor as the limit torque and executing S160; otherwise, executing S150; S150, using the second inverter to control the current torque of the second drive motor to increase the set torque; executing S130; S160, controlling the first drive motor to output a test speed and controlling the second drive motor to output a limit torque to perform a torque limit test on the magnetic field modulation gear. If the magnetic field modulation gear is in a stable state, determining that the performance of the magnetic field modulation gear is in a first performance state; otherwise, it is in a second performance state.

3. The system according to claim 1, wherein: The power P of the magnetic field modulation gear satisfies the following conditions: P1≤P≤P2, P1 is a first set power threshold, P2 is a second set power threshold, P1>100KW, 1MW<P2<10MW; The modulation ratio of the magnetic field modulation gear is greater than 1:

10.

4. The system according to claim 2, wherein: The input speed meets the following conditions: [(n in / K)×T N ] / 9550×0.25≤C×a;n in is the test speed, T N is the rated torque of the second drive motor, C is the grid capacity, a is the preset coefficient, 0<a<1, K is the modulation ratio of the magnetic field modulation gear, and [] indicates rounding.

5. The system according to claim 1, wherein: The first drive motor and the second drive motor are both permanent magnet motors.

6. A magnetic field modulation gear transmission performance testing method, characterized in that: The method comprises the following steps: S300, torque limit test for magnetic field modulation gears; S400, speed limit test for magnetic field modulated gears; Among them, the torque limit test and the speed limit test are implemented based on a test system, and the test system includes a first frequency converter, a first drive motor, a first torque and speed tester, a magnetic field modulation gear, a second frequency converter, a second drive motor and a second torque and speed tester. The first drive motor, the first torque and speed tester, the magnetic field modulation gear, the second torque and speed tester and the second drive motor are coaxially arranged, one end of the first frequency converter is connected to the power grid, and the other end is connected to the first drive motor, one end of the second frequency converter is connected to the power grid, and the other end is connected to the second drive motor, the first frequency converter and the second frequency converter are connected through a DC bus, and the speed of the first drive motor is greater than that of the second frequency converter. The speed of the second drive motor; wherein, during the torque limit test process, the first drive motor, the first torque and speed tester, the magnetic field modulation gear, the second torque and speed tester, and the second drive motor are in a connected state, the input speed of the magnetic field modulation gear is less than the input rated speed of the magnetic field modulation gear, and the output torque of the magnetic field modulation gear is greater than the output rated torque of the magnetic field modulation gear; during the speed limit test process, the first drive motor, the first torque and speed tester, the magnetic field modulation gear, and the second torque and speed tester are in a connected state, the second torque and speed tester and the second drive motor are in a disengaged state, and the input speed of the magnetic field modulation gear is greater than the input rated speed of the magnetic field modulation gear; S400 specifically includes the following steps: S410, using a first frequency converter to control the speed of the first drive motor to increase from an initial speed to a rated speed of the first drive motor according to a set speed increase value; S420, obtaining a current first torque and a current first speed collected by the first torque-speed tester, and a current second speed and a current second torque collected by the second torque-speed tester, and applying the obtained current first torque, current first speed, current second torque, and current second speed to a simulation model of the magnetic field modulation gear for simulation analysis to obtain a corresponding first simulation result, and applying the rated output torque and rated input speed of the magnetic field modulation gear to the simulation model of the magnetic field modulation gear for simulation analysis to obtain a corresponding second simulation result; S430: If the difference between the first simulation result and the second simulation result is within a preset range, the current speed of the first drive motor is used as the limit speed and S450 is executed; otherwise, S440 is executed; S440, using the first inverter to control the current speed of the first drive motor to increase the set speed; executing S420; S450, controlling the first drive motor to output a limit speed to perform a speed limit test on the magnetic field modulation gear. If the magnetic field modulation gear is in a stable state, determining that the performance of the magnetic field modulation gear is in a first performance state; otherwise, determining that the performance of the magnetic field modulation gear is in a second performance state.

7. The method according to claim 6, characterized in that S300 specifically includes the following steps: S310, based on the grid capacity and the rated torque of the second drive motor, determining the input speed of the magnetic field modulation gear as a test speed, and sending a control instruction to the first inverter to instruct the first inverter to control the speed of the first drive motor to the test speed; S320, based on the received control instruction, the first inverter controls the first drive motor to output a corresponding test speed, and the second inverter controls the torque of the second drive motor to increase from the initial torque to the rated torque according to the set torque increase value; S330, obtaining a current first torque and a current first speed collected by the first torque-speed tester, and a current second speed and a current second torque collected by the second torque-speed tester, and applying the obtained current first torque, current first speed, current second torque, and current second speed to a simulation model of the magnetic field modulation gear for simulation analysis to obtain a corresponding first simulation result, and applying the rated output torque and rated input speed of the magnetic field modulation gear to the simulation model of the magnetic field modulation gear for simulation analysis to obtain a corresponding second simulation result; S340, if the difference between the first simulation result and the second simulation result is within a preset range, the current torque of the second drive motor is used as the limit torque and S360 is executed; otherwise, S350 is executed; S350, using the second inverter to control the current torque of the second drive motor to increase the set torque; executing S330; S360, controls the first drive motor to output a test speed and controls the second drive motor to output a limit torque to perform a torque limit test on the magnetic field modulation gear. If the magnetic field modulation gear is in a stable state, determines that the performance of the magnetic field modulation gear is in the first performance state; otherwise, it is in the second performance state.

8. The method according to claim 6, characterized in that The following steps are also included: S500, tests the efficiency of magnetic field modulation gears; S500 specifically includes: S510, obtaining input speeds and input torques at different speeds recorded by the first torque and speed tester during the speed limit test as basic data; S520, based on the acquired basic data, acquiring the total power loss of the magnetic field modulation gear at different speeds; S530, assuming that during the speed limit test, the magnetically modulated gears all operate with rated loads, and based on this assumption, obtaining output power at different speeds; S540, obtaining corresponding efficiency values ​​based on total power loss and output power corresponding to different speeds; S550: Based on the efficiency values ​​corresponding to different rotational speeds, obtain an efficiency curve corresponding to the magnetic modulation gear and an efficiency value at a rated point.

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