Triaxial dual-drive variable-pitch ground test system

Abstract

The application discloses a triaxial double-drive variable-pitch ground test system, which comprises a central controller, three loading driving units, three loading motors and three double-drive transmission units. Each group of the tested variable-pitch system comprises two variable-pitch motors and a variable-pitch driving unit. The central controller sends a variable-pitch instruction to the variable-pitch driving unit of each group of the tested variable-pitch system according to a variable-pitch test item, each variable-pitch driving unit drives the corresponding variable-pitch motor according to the received variable-pitch instruction, the central controller sends a driving instruction to each loading driving unit according to the variable-pitch test item, each loading driving unit drives the corresponding loading motor according to the received driving instruction, the input shaft of each double-drive transmission unit rotates following the corresponding variable-pitch motor, and the output shaft of the double-drive transmission unit rotates against the corresponding loading motor. Thus, the function and reliability test of the variable-pitch motor and the control module can be conveniently and efficiently performed.

Description

Technical Field

[0001] This invention relates to the field of electric pitch control technology for megawatt-class wind turbine generators, specifically to a three-axis dual-drive pitch control ground testing system. Background Technology

[0002] The pitch system is one of the core components of a wind turbine generator set (hereinafter referred to as a wind turbine). Most mainstream wind turbines adopt a three-bladed structure and are equipped with a three-axis pitch system.

[0003] As the installed capacity of wind turbine generators increases, the load driven by the pitch system also increases, leading to the development of a three-axis dual-drive pitch system. Because the dual-drive pitch system is relatively new and has a short application history, there is limited operational data accumulated in the field. Therefore, the functionality and reliability of the pitch system, especially the pitch motor and its control module, still require comprehensive and thorough verification testing on the ground. For example, when developing the pitch motor and its control system, functional and performance verification of the three-axis dual-drive pitch system is necessary to ensure the product's reliability and stability. Summary of the Invention

[0004] To address the above issues, this invention provides a three-axis dual-drive pitch ground testing system to facilitate convenient and efficient functional and reliability testing of the pitch motor and its control module when developing products such as three-axis dual-drive pitch systems.

[0005] This invention provides a three-axis dual-drive pitch ground testing system, comprising:

[0006] One central controller, three load drive units, three load motors, and three dual-drive transmission units;

[0007] When conducting three-axis dual-drive ground simulation tests on three groups of tested pitch systems, each group of tested pitch systems includes two pitch motors and one pitch drive unit.

[0008] The central controller sends pitch commands to the pitch drive units of each group of pitch systems under test according to the obtained pitch test items. Each pitch drive unit drives the corresponding pitch motors according to the received pitch commands.

[0009] The central controller sends drive commands to each of the loading drive units according to the acquired pitch test items, and each of the loading drive units drives the corresponding loading motor according to the received drive commands.

[0010] Accordingly, the input shaft of each dual-drive transmission unit rotates following the corresponding pitch motor, and the output shaft of the dual-drive transmission unit drags the corresponding loading motor to rotate in the opposite direction.

[0011] Furthermore, each of the loading motors is connected to the output shaft of the dual-drive transmission unit via a first coupling;

[0012] Each of the pitch motors is connected to an input shaft of the dual-drive transmission unit via a second coupling;

[0013] The dual-drive transmission unit is used to transmit the pitch torque provided by the pitch motor, or to transmit the simulated pitch load provided by the loading motor.

[0014] Furthermore, the dual-drive transmission unit includes two input shafts and one output shaft, with each input shaft parallel to the output shaft;

[0015] Each of the input shafts is equipped with a first helical gear, and each of the output shafts is equipped with a second helical gear;

[0016] The first helical gear and the second helical gear have the same helix angle.

[0017] Furthermore, in conducting single-shaft dual-drive ground simulation tests on a set of tested pitch systems, the tested pitch system includes two pitch motors and one pitch drive unit.

[0018] The central controller sends pitch commands to the pitch drive unit of the pitch system under test according to the acquired pitch test items. The pitch drive unit drives the corresponding pitch motors according to the received pitch commands.

[0019] The central controller sends a drive command to the corresponding load drive unit according to the acquired pitch test item, and the corresponding load drive unit drives the corresponding load motor according to the received drive command.

[0020] Correspondingly, the input shaft of the corresponding dual-drive transmission unit rotates following the rotation of the corresponding pitch motor, and the output shaft of the corresponding dual-drive transmission unit drags the rotation of the corresponding loading motor.

[0021] Furthermore, in conducting single-shaft single-drive ground simulation tests on a group of tested pitch systems, the tested pitch system includes a pitch motor and a pitch drive unit.

[0022] The central controller sends pitch commands to the pitch drive unit of the pitch system under test according to the acquired pitch test items. The pitch drive unit drives the corresponding pitch motor according to the received pitch commands.

[0023] The central controller sends a drive command to the corresponding load drive unit according to the acquired pitch test item, and the corresponding load drive unit drives the corresponding load motor according to the received drive command.

[0024] Correspondingly, one input shaft of the corresponding dual-drive transmission unit rotates with the corresponding pitch motor, and the output shaft of the corresponding dual-drive transmission unit reverses the rotation of the corresponding loading motor.

[0025] Furthermore, during the three-axis single-drive ground simulation test of the three groups of tested pitch systems, each group of tested pitch systems included a pitch motor and a pitch drive unit.

[0026] The central controller sends pitch commands to the pitch drive unit of each group of pitch systems under test according to the acquired pitch test items. The pitch drive unit drives the corresponding pitch motor according to the received pitch commands.

[0027] The central controller sends drive commands to each of the loading drive units according to the acquired pitch test items, and each of the loading drive units drives the corresponding loading motor according to the received drive commands.

[0028] Accordingly, the input shaft of each dual-drive transmission unit rotates following the corresponding pitch motor, and the output shaft of the dual-drive transmission unit drags the corresponding loading motor to rotate in the opposite direction.

[0029] Furthermore, it also includes a rectification feedback unit, which is connected to the power grid after being connected to the three loading drive units.

[0030] Furthermore, it also includes: three mounting platforms, each of which is used to mount a loading motor, a dual-drive transmission unit, and one or two pitch motors.

[0031] Furthermore, it also includes: three torque sensors, each of which is disposed between the loading motor and the output shaft of the dual-drive transmission unit to obtain the simulated pitch load provided by the loading motor.

[0032] Furthermore, each of the loading motors is equipped with a temperature sensing unit for acquiring the internal temperature of the loading motor.

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1This is a schematic diagram of the composition of the three-axis dual-drive pitch ground testing system according to an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the three-axis dual-drive pitch ground testing system according to an embodiment of this application, used for three-axis single-drive testing. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In order to accurately describe the technical content of this application and to accurately understand this application, the following explanations or definitions of the terms used in this specification are given before describing the specific embodiments.

[0039] The electric pitch control system includes a pitch controller, a frequency converter (or pitch load drive unit), and a pitch motor. The main controller calculates the required pitch angle for each blade based on wind direction and speed, generates pitch control commands based on the calculated pitch angles, and sends these commands to the frequency converter. The frequency converter controls the pitch motor to rotate according to the received pitch control commands. The pitch motor drives the pitch bearing to rotate, which in turn drives the blades to rotate, thus changing the pitch angle to meet the pitch requirements. Due to the instability of wind direction and speed, the pitch system frequently drives the blades to change the pitch angle during wind turbine operation.

[0040] For example, when a wind turbine is generating electricity, in order to maximize the use of wind energy, all three blades usually need to be pitched at a small angle simultaneously. During routine shutdown of the wind turbine, all three blades are usually feathered at a large angle simultaneously to achieve aerodynamic braking. In rare cases, one or two blades may become stuck and unable to pitch. In such cases, the normal blades are usually feathered first before the stuck blade is addressed.

[0041] When a wind turbine is generating electricity, the wind load on the blades can be equivalent to the load forces in three different directions—x-axis, y-axis, and z-axis—determined by the rotation of the impeller, as well as the torques Mx and My around the x-axis and y-axis.

[0042] The technical solutions of the embodiments of this application are described in detail below.

[0043] like Figure 1As shown in the embodiment of this application, the three-axis dual-drive pitch ground test system includes: a central controller 100, three loading drive units (210, 220, 230), three loading motors (310, 320, 330), and three dual-drive transmission units (41, 42, 43). When conducting three-axis dual-drive ground simulation tests (i.e., three-axis dual-drive tests) on the three groups of tested pitch systems, each group of tested pitch systems includes two pitch motors ((511, 512), (521, 522) or (531, 532)) and one pitch drive unit (61, 62 or 63). The central controller sends pitch commands to the pitch drive units (61, 62 or 63) of each group of tested pitch systems according to the acquired pitch test items. Each pitch drive unit drives its corresponding pitch motor ((511, 512), (521, 522) or (531, 532)) according to the received pitch commands. The central controller sends drive commands to each of the loading drive units (210, 220, 230) based on the acquired pitch test items. Each loading drive unit drives the corresponding loading motor (310, 320, 330) according to the received drive commands. Correspondingly, the input shaft of each of the dual drive transmission units (41, 42, 43) rotates following the corresponding pitch motor ((511, 512), (521, 522) or (531, 532)), and the output shaft of the dual drive transmission unit reverse-drives the corresponding loading motor (310, 320, 330) to rotate.

[0044] Thus, when testing the pitch motor and its pitch drive unit, a dual-drive transmission unit is used to coaxially connect the two pitch motors used for dual-drive with the same inner ring of the bearing to the load motor. The load motor is used as the load for the two pitch motors in each group of pitch systems under test to test the electrical performance of the pitch motor and the control performance of the pitch drive unit. This can conveniently and efficiently simulate the function or performance of each group of pitch systems under test under different wind conditions.

[0045] In this way, dual-drive three-axis testing can be carried out conveniently and efficiently, such as testing the synchronous pitch function and pitch performance of three sets of tested pitch systems.

[0046] In some embodiments, each of the loading motors is connected to the output shaft of the dual-drive transmission unit via a first coupling;

[0047] Each of the pitch motors is connected to an input shaft of the dual-drive transmission unit via a second coupling;

[0048] The dual-drive transmission unit is used to transmit the pitch torque provided by the pitch motor, or to transmit the simulated pitch load provided by the loading motor.

[0049] In this way, by using the dual-drive transmission unit to transmit the pitch torque provided by the pitch motor or the simulated pitch load provided by the loading motor, the transmission of power, torque and speed is realized simply and efficiently.

[0050] Typically, the load motor and the pitch motor are mounted horizontally on the mounting platform, with their rotation axes at approximately the same height. When conducting ground tests on different models and power pitch systems, the load motor is usually not adjusted or replaced for versatility; however, the power and selection of the pitch motor may differ. Therefore, the second coupling is usually different from the first coupling and not interchangeable; furthermore, the second coupling is available in various power ratings and sizes to match the pitch motor under test.

[0051] In a specific implementation, the dual-drive transmission unit includes two input shafts and one output shaft, with each input shaft parallel to the output shaft;

[0052] Each of the input shafts is equipped with a first helical gear, and each of the output shafts is equipped with a second helical gear;

[0053] The first helical gear and the second helical gear have the same helix angle.

[0054] In the dual-drive pitch control scheme described above, the two pitch motors used for the same inner ring of the bearing in the dual drive have the same power and parameters, and are typically products from the same manufacturer and batch. This avoids the increased difficulty in synchronizing the two pitch motors for the same inner ring of the bearing due to parameter drift.

[0055] As mentioned above, the two input shafts of the dual-drive transmission unit are completely identical, such as having the same maximum torque, the same dimensional accuracy, and the same positional accuracy after installation.

[0056] The above describes the use of helical gears to transmit the simulated pitch load of a megawatt-class wind turbine generator set, which has advantages such as smooth transmission, low impact, vibration and noise, and suitability for heavy-load applications.

[0057] In some embodiments, when performing a single-axis dual-drive ground simulation test (i.e., dual-drive single-axis test) on a group of tested pitch systems, the tested pitch system includes two pitch motors ((511, 512), (521, 522) or (531, 532)) and one pitch drive unit (61, 62 or 63); the central controller sends pitch commands to the pitch drive unit (61, 62 or 63) of the tested pitch system according to the acquired pitch test items, and the pitch drive unit drives the corresponding pitch motors (61, 62 or 63) according to the received pitch commands. (511, 512), (521, 522) or (531, 532)); and the central controller sends a drive command to the corresponding load drive unit (210, 220 or 230) according to the acquired pitch test item, and the corresponding load drive unit drives the corresponding load motor (310, 320 or 330) according to the received drive command; accordingly, the input shaft of the corresponding dual drive transmission unit (41, 42 or 43) follows the rotation of the corresponding pitch motor, and the output shaft of the corresponding dual drive transmission unit drags the corresponding load motor to rotate in the opposite direction.

[0058] In this way, single-shaft dual-drive testing can be carried out conveniently and efficiently, such as testing the general performance of each tested pitch motor or pitch system individually, such as maximum torque and starting characteristics.

[0059] like Figure 2 As shown, in some embodiments, when conducting single-axis single-drive ground simulation tests (i.e., single-axis single-drive tests) on a group of tested pitch systems, the tested pitch system includes a pitch motor (71, 72, or 73) and a pitch drive unit (61, 62, or 63); the central controller sends pitch commands to the pitch drive unit (61, 62, or 63) of the tested pitch system according to the acquired pitch test items; the pitch drive unit drives the corresponding pitch motor (71, 72, or 73) according to the received pitch commands; and The central controller sends a drive command to the corresponding load drive unit (210, 220 or 230) based on the acquired pitch test item. The corresponding load drive unit drives the corresponding load motor (310, 320 or 330) according to the received drive command. Correspondingly, one input shaft of the corresponding dual drive transmission unit (41, 42 or 43) follows the rotation of the corresponding pitch motor (71, 72 or 73), and the output shaft of the corresponding dual drive transmission unit reverses the rotation of the corresponding load motor (310, 320 or 330).

[0060] It should be understood that the power of a single pitch motor (71, 72 or 73) is no greater than the sum of the power of the aforementioned dual-drive pitch motors ((511 and 512), (521 and 522) or (531 and 532)).

[0061] Thus, using the aforementioned three-axis dual-drive pitch ground testing system, single-axis single-drive testing can be conveniently and efficiently achieved. This is because the power of the pitch drive unit (61, 62, or 63), the dual-drive transmission unit (41, 42, or 43), the load drive unit (210, 220, or 230), and the load motor (310, 320, or 330) configured for the three-axis dual-drive pitch scheme can completely encompass the pitch test items determined for the three-axis single-drive pitch scheme, and can even include pitch test items determined for the three-axis single-drive pitch scheme with higher power levels. This facilitates expanding the application scenarios of the three-axis dual-drive pitch ground testing system and increasing its usage frequency.

[0062] Furthermore, during the three-axis single-drive ground simulation test (i.e., three-axis single-drive test) of the three groups of tested pitch systems, each group of tested pitch systems includes a pitch motor (71, 72, 73) and a pitch drive unit (61, 62, 63). The central controller sends pitch commands to the pitch drive unit of each group of tested pitch systems according to the obtained pitch test items. The pitch drive unit drives the corresponding pitch motors according to the received pitch commands. The central controller also sends drive commands to the corresponding loading drive units (210, 220, 230) according to the obtained pitch test items. Each loading drive unit drives the corresponding loading motor (310, 320, 330) according to the received drive commands. Correspondingly, the input shaft of each dual-drive transmission unit (41, 42, 43) rotates with the corresponding pitch motor, and the output shaft of the dual-drive transmission unit reverse-drives the corresponding loading motor (310, 320, 330) to rotate.

[0063] Referring to the foregoing description, the aforementioned three-axis dual-drive pitch ground testing system can be used to conveniently and efficiently perform three-axis single-drive testing. This facilitates expanding the application scenarios of the three-axis dual-drive pitch ground testing system and increasing its usage frequency.

[0064] In practice, this three-axis dual-drive variable pitch ground testing system also includes:

[0065] The rectifier feedback unit is connected to the power grid after being connected to the three load drive units.

[0066] Thus, the rectifier feedback unit is connected to the loading drive unit of the loading motor, and is used to feed the electrical energy generated by the loading motor being reverse-driven back to the power grid. In this way, an active, proactive load is provided to the power grid through AC frequency conversion feedback loading; at the same time, the loaded energy is fed back to the power grid through the converter set in the rectifier feedback unit, achieving the purpose of saving electricity.

[0067] In practice, the three-axis dual-drive pitch ground test system also includes three mounting platforms, each of which is used to set up a loading motor, a dual-drive transmission unit, and one or two pitch motors.

[0068] In this way, each axis or channel can be independently equipped with an installation platform, which makes alignment easier, improves the installation accuracy of each rotating component, avoids possible vibration, impact and interference between axes, makes the transmission smoother, and improves the performance of the testing system.

[0069] In practice, the three-axis dual-drive pitch ground test system also includes three torque sensors, each of which is installed between the loading motor and the output shaft of the dual-drive transmission unit to obtain the simulated pitch load provided by the loading motor.

[0070] Thus, by analyzing the simulated pitch load provided by the loading motor or the pitch torque provided by the pitch motor obtained by each torque sensor in each pitch test item, it can be determined whether the function and performance of the pitch system under test meet the preset requirements.

[0071] In practice, each of the loading motors is equipped with a temperature sensing unit to obtain the internal temperature of the loading motor.

[0072] For example, a platinum resistance thermometer such as a PT100 is installed in the winding of each of the loaded motors to obtain the temperature and temperature rise of each loaded motor in each pitch test item in real time, thereby determining whether the function and performance of the tested pitch system meet the preset requirements.

[0073] The above-described three-axis dual-drive pitch ground testing system can meet the testing requirements for simultaneous synchronous loading of all three axes and independent loading of each axis. Multiple loading motors are used to simulate the operating conditions of the three blades in a wind farm, allowing for functional or performance testing of the pitch system corresponding to each blade.

[0074] The central controller provides the load data required for the experiment and converts it into pitch control commands or drive commands, which are then sent to the pitch motor or load motor. The central controller also detects the torque data, speed data, or temperature obtained in each pitch test item to evaluate the performance of the pitch system, thereby providing a basis for the technical improvement of the pitch system corresponding to each shaft.

[0075] Typically, the test objects of this three-axis dual-drive pitch ground test system, such as each pitch motor and the pitch driver, are equipped with voltage sensors connected to the pitch motors to detect the voltage values ​​during the rotation of the pitch motors; current sensors connected to the pitch motors to detect the current values ​​during the rotation of the pitch motors; and rotary encoders connected to the pitch motors to detect the direction and speed values ​​during the rotation of the pitch motors, which will not be elaborated further.

[0076] In some embodiments, the three-axis dual-drive pitch ground testing system includes:

[0077] A gearbox and a loading motor, wherein the output shaft of the gearbox is connected to the output shaft of the loading motor;

[0078] When testing any of the test dual-drive pitch systems, the dual-drive pitch system includes a test first pitch motor and a test second pitch motor.

[0079] The tested first pitch motor is connected to the first input shaft of the gearbox;

[0080] The tested second pitch motor is connected to the second input shaft of the gearbox;

[0081] After the central controller controls the first pitch motor and the second pitch motor to rotate at the same speed, the first pitch motor drives the first input shaft of the gearbox to rotate, and the second pitch motor drives the second input shaft of the gearbox to rotate; the output shaft of the gearbox drags the output shaft of the loading motor to rotate in the opposite direction.

[0082] In some embodiments, the transmission ratio formed by the rotational speed of the output shaft of the gearbox and the rotational speed of the first input shaft or the rotational speed of the second input shaft is 1:1;

[0083] Accordingly, after controlling the tested first pitch motor and the tested second pitch motor to rotate at a first speed and along a first direction, the output shaft of the gearbox rotates at a second speed and along a second direction to reverse the rotation of the output shaft of the loading motor at a second speed and along a second direction. The first direction is opposite to the second direction, and the first speed is equal to the second speed. When the first direction is clockwise, the second direction is counterclockwise; or when the first direction is counterclockwise, the second direction is clockwise.

[0084] Preferably, the gearbox includes three helical gears, which are respectively disposed on the output shaft, the first input shaft and the second input shaft of the gearbox.

[0085] In this way, the gearbox can be used to compactly and conveniently simulate the pitch system and inner ring of the pitch bearing of the wind turbine, and the loading motor can be used to simulate the load borne by the blades of the wind turbine.

[0086] In some embodiments, a torque sensor is also included, which is disposed between the output shaft of the gearbox and the output shaft of the loading motor, for measuring the simulated load during the test.

[0087] Accordingly, the loading drive unit of the loading motor drives the loading motor to rotate with a second preset torque, a second preset speed, and a second preset direction; the pitch drive unit of the tested first pitch motor drives the tested first pitch motor to rotate with a first preset torque, a first preset speed, and a first preset direction; the pitch drive unit of the tested second pitch motor drives the tested second pitch motor to rotate with a first preset torque, a first preset speed, and a first preset direction; the second preset torque is twice the first preset torque. The second preset speed is the same as the first preset speed, but in the opposite direction.

[0088] The pitch drive unit of the first pitch motor under test and the pitch drive unit of the second pitch motor under test can be set independently or combined into one unit.

[0089] In some embodiments, the first or second pitch motor under test is a servo motor, an AC asynchronous motor, a frequency converter-powered three-phase squirrel-cage induction motor, a three-phase asynchronous motor, or a three-phase permanent magnet synchronous motor.

[0090] In some embodiments, the loading motor is a servo motor, an AC asynchronous motor, a frequency converter-powered three-phase squirrel-cage induction motor, a three-phase asynchronous motor, or a three-phase permanent magnet synchronous motor. The loading motor can operate in four quadrants, that is, it can be a motor / generator, with forward / reverse loading, thus simulating various pitch test items under actual working conditions.

[0091] In some embodiments, the loading drive unit of the loading motor can achieve a torque response speed of <50ms, a stable adjustment time of <200ms, and a scan cycle of <20ms. It can also apply dynamic loads (such as sine waves, triangle waves, and square waves). In this way, various pitch test items can be simulated under actual working conditions to test the operating performance of the pitch system.

[0092] In some embodiments, the power and other parameters of the loading motor are selected based on the maximum torque and speed parameters of the tested pitch motor, combined with the maximum torque parameters that the transmission gears can withstand. Then, a suitable loading drive unit is selected based on the chosen loading motor.

[0093] In some embodiments, a torque sensor is selected to measure the torque and speed of the loading motor based on the parameters of the tested pitch motor and the loading motor. To ensure the reliability of the test accuracy, the rated torque of the motor is typically within the measurement range of the torque sensor.

[0094] In some embodiments, the aforementioned central controller 100 is a PLC, used to control three load drive units to provide loads for simulating blade wind loads to the load motors of each pitch shaft. The central controller 100 is also used to control the three pitch drive units to drive the tested pitch motors to rotate.

[0095] In some embodiments, the load motor has a power of 80kW, a rated speed of 2000rpm, and a model number of U31330F203; the load drive unit has a model number of 22F5A1R-95HA; the rectifier feedback unit has a model number of BKF880-DF-200-4HC, and a bus voltage range (VDC) of 580 to 720.

[0096] In some embodiments, each pitch test item can be any one or more of the following, which can be used to complete the following pitch system and pitch motor test contents: no-load test; load test; stall test; efficiency test; maximum torque test; overspeed test; overload test; thermal test (temperature rise) and dual drive.

[0097] In some embodiments, the three-axis dual-drive pitch ground test system can simulate three-axis dual-drive pitch test, three-axis single-drive pitch test, single-axis dual-drive pitch test, and single-axis single-drive pitch test.

[0098] Specifically, the loading motor is mechanically connected to the output shaft of the dual-drive gearbox via a coupling, and the two pitch motors are mechanically connected to the input shaft of the dual-drive gearbox via a coupling. The dual-drive gearbox serves as a load torque transmission device.

[0099] During ground testing of the three-axis dual-drive pitch control system, the central controller issues a loading command, controlling the loading drive unit to execute three-axis loading. The loading motor receives the loading command from the central controller and drives itself to complete the three-axis loading. The load is transmitted to each tested pitch motor via the dual-drive gearbox. The pitch drive unit drives the dual pitch motors of each of the three axes to rotate, and the resulting driving torque overcomes the load, causing the loading motors to run synchronously. This simulates a three-bladed dual-drive pitch control scenario for pitch testing.

[0100] When only one axis is retained, the central controller issues a single-axis loading command, controlling the loading drive unit to execute single-axis loading. The loading motor receives the loading command from the central controller and drives itself to complete the loading. The load is transmitted to the two tested pitch motors on the single axis via a dual-drive gearbox. The pitch drive unit drives the two tested pitch motors corresponding to the single axis to rotate, and the generated driving torque overcomes the load, causing the loading motors to run synchronously. In this way, a single-blade dual-drive pitch scenario can be simulated for pitch testing.

[0101] With only one shaft remaining and one tested pitch motor removed, the central controller issues a single-axis loading command, controlling the loading drive unit to execute single-axis loading. The loading motor receives the loading command from the central controller and drives itself to complete the loading. The load is transmitted via a dual-drive gearbox to the corresponding tested pitch motor on that single shaft. The pitch drive unit drives the tested pitch motor to rotate, and the resulting driving torque overcomes the load, causing the loading motor to run synchronously. This simulates a single-blade, single-drive pitch scenario for pitch testing.

[0102] When three axes are retained and one tested pitch motor on each axis is removed, the central controller issues a three-axis loading command to control the loading drive unit to execute three-axis loading. The loading motor receives the command from the central controller and drives itself to complete the loading. The load is transmitted via a dual-drive gearbox to each tested pitch motor on each of the three axes. The pitch drive unit drives each tested pitch motor on the three axes to rotate, and the resulting driving torque overcomes the load, causing the loading motor to run synchronously. This simulates a three-bladed single-drive pitch scenario for pitch testing.

[0103] In the description of this invention, it should be understood that the aforementioned fits, alignments, or adaptations have fitting accuracy, dimensional tolerances, shape errors, contour errors, and / or form and position errors, etc., which are known to those skilled in the art, and will not be elaborated further. The aforementioned blocks, plates, rods, frames, and sheets have the ratio of transverse dimensions to longitudinal dimensions, dimensional tolerances, shape errors, contour errors, and / or form and position errors, fitting accuracy, etc., which are known to those skilled in the art, and will not be elaborated further.

[0104] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0105] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0106] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection (e.g., welding, bonding, threading, screws, pins, rivets, etc.) or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0107] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0109] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0111] The above description is illustrative only and not restrictive of the present invention. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the claims, and all such modifications, variations or equivalents will fall within the protection scope of the present invention.

Claims

1. A three-axis, dual-drive, variable-pitch ground testing system, characterized in that, include: One central controller, three load drive units, three load motors, and three dual-drive transmission units; When conducting three-axis dual-drive ground simulation tests on three groups of tested pitch systems, each group of tested pitch systems includes two pitch motors and one pitch drive unit. The central controller sends pitch commands to the pitch drive unit of each group of pitch systems under test according to the obtained pitch test items. The pitch drive unit drives the corresponding pitch motors according to the received pitch commands. The central controller sends drive commands to each of the loading drive units according to the acquired pitch test items, and each of the loading drive units drives the corresponding loading motor according to the received drive commands. Accordingly, the input shaft of each dual-drive transmission unit rotates following the corresponding pitch motor, and the output shaft of the dual-drive transmission unit drags the corresponding loading motor to rotate in the opposite direction. When conducting a single-shaft dual-drive ground simulation test on a set of tested pitch systems, the tested pitch systems include two pitch motors and one pitch drive unit. The central controller sends pitch commands to the pitch drive unit of the pitch system under test according to the acquired pitch test items. The pitch drive unit drives the corresponding pitch motors according to the received pitch commands. The central controller sends a drive command to the corresponding load drive unit according to the acquired pitch test item, and the corresponding load drive unit drives the corresponding load motor according to the received drive command. Correspondingly, the input shaft of the corresponding dual-drive transmission unit rotates following the rotation of the corresponding pitch motor, and the output shaft of the corresponding dual-drive transmission unit drags the rotation of the corresponding loading motor in the opposite direction. When conducting single-shaft single-drive ground simulation tests on a set of tested pitch systems, the tested pitch system includes a pitch motor and a pitch drive unit. The central controller sends pitch commands to the pitch drive unit of the pitch system under test according to the acquired pitch test items. The pitch drive unit drives the corresponding pitch motor according to the received pitch commands. The central controller sends a drive command to the corresponding load drive unit according to the acquired pitch test item, and the corresponding load drive unit drives the corresponding load motor according to the received drive command. Correspondingly, one input shaft of the corresponding dual-drive transmission unit rotates following the corresponding pitch motor, and the output shaft of the corresponding dual-drive transmission unit drags the corresponding loading motor to rotate in the opposite direction. When conducting three-axis single-drive ground simulation tests on three groups of tested pitch systems, each group of tested pitch systems includes a pitch motor and a pitch drive unit. The central controller sends pitch commands to the pitch drive unit of each group of pitch systems under test according to the acquired pitch test items. The pitch drive unit drives the corresponding pitch motor according to the received pitch commands. The central controller sends drive commands to each of the loading drive units according to the acquired pitch test items, and each of the loading drive units drives the corresponding loading motor according to the received drive commands. Accordingly, the input shaft of each dual-drive transmission unit rotates following the corresponding pitch motor, and the output shaft of the dual-drive transmission unit drags the corresponding loading motor to rotate in the opposite direction.

2. The ground testing system according to claim 1, characterized in that, Each of the loading motors is connected to the output shaft of the dual-drive transmission unit via a first coupling; Each of the pitch motors is connected to an input shaft of the dual-drive transmission unit via a second coupling; The dual-drive transmission unit is used to transmit the pitch torque provided by the pitch motor, or to transmit the simulated pitch load provided by the loading motor.

3. The ground testing system according to claim 2, characterized in that, The dual-drive transmission unit includes two input shafts and one output shaft, with each input shaft parallel to the output shaft. Each of the input shafts is equipped with a first helical gear, and each of the output shafts is equipped with a second helical gear; The first helical gear and the second helical gear have the same helix angle.

4. The ground testing system according to claim 3, characterized in that, Also includes: The rectifier feedback unit is connected to the power grid after being connected to the three load drive units.

5. The ground testing system according to claim 3, characterized in that, Also includes: Three mounting platforms, each of which is used to mount a loading motor, a dual-drive transmission unit, and one or two pitch motors.

6. The ground testing system according to claim 3, characterized in that, Also includes: Three torque sensors are provided, each of which is positioned between the loading motor and the output shaft of the dual-drive transmission unit to obtain the simulated pitch load provided by the loading motor.

7. The ground testing system according to claim 3, characterized in that, Each of the loading motors is equipped with a temperature sensing unit to obtain the internal temperature of the loading motor.

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