Motor testing device and calibration method, testing method and equipment thereof

Abstract

The invention discloses a motor testing device and a calibration method, a testing method and equipment thereof, and relates to the technical field of motor performance tests.A control assembly of the motor testing device is in communication connection with a torsion calibration device under the conditions that the motor testing device is in communication connection with the torsion calibration device, and a test calibration end is in transmission connection with the torsion calibration device; controlling the torque calibration device to output torque to the test calibration end, acquiring a torque value detected by the torque detection piece when the output torque of the torque calibration device reaches target calibration torque, and calibrating the torque detection piece according to a difference value between the detected torque value and the target calibration torque; under the condition that the motor testing device is electrically connected with the to-be-tested motor and the testing calibration end is in transmission connection with the to-be-tested motor, the controllable load part is controlled to output preset load torque to the torsion shaft and output preset electrical parameters to the to-be-tested motor, and torques detected by the torque detection part under different preset electrical parameters are obtained; according to the invention, the precision of motor small torque testing can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor performance testing, in particular to a motor testing device and a calibration method, a testing method and equipment thereof. BACKGROUND

[0002] The existing motor torque testing cannot accurately detect small torque. SUMMARY

[0003] The main purpose of the present application is to provide a motor testing device and a calibration method, a testing method and equipment thereof, aiming to improve the accuracy and sensitivity of small torque testing of the motor and realize the detection of small torque.

[0004] To achieve the above purpose, the motor testing device provided by the present application comprises:

[0005] A core has a transmission end and a testing and calibration end, the testing and calibration end is used for transmission connection with a torque calibration device or a motor to be tested;

[0006] A controllable load is used for providing a preset load torque;

[0007] A torque shaft is used for transmission connection between the transmission end and the controllable load;

[0008] A torque detection part is arranged on the torque shaft and is used for detecting the torque value output by the torque shaft;

[0009] A control assembly is electrically connected with the controllable load and the torque detection part respectively;

[0010] The control assembly is used for controlling the torque calibration device to output torque to the testing and calibration end when the motor testing device is in communication connection with the torque calibration device and the testing and calibration end is in transmission connection with the torque calibration device, and acquiring the torque value detected by the torque detection part when the output torque of the torque calibration device reaches a target calibration torque, and calibrating the torque detection part according to the difference between the detected torque value and the target calibration torque;

[0011] The control assembly is also used for controlling the controllable load to output a preset load torque to the torque shaft and output a preset electrical parameter to the motor to be tested when the motor testing device is in electrical connection with the motor to be tested and the testing and calibration end is in transmission connection with the motor to be tested, and acquiring the torque detected by the torque detection part under different preset electrical parameters.

[0012] In an embodiment, the core comprises a transmission assembly, and the transmission assembly has the transmission end and the testing and calibration end.

[0013] The motor testing device further comprises a position detection assembly, the position detection assembly comprising a position feedback element and a position detection element connected with the position feedback element, the position feedback element being in driving connection with the transmission assembly, and the position detection element being configured to detect the rotational position or the moving position of the position feedback element to obtain the rotation angle of the motor to be tested.

[0014] In an embodiment, the transmission assembly comprises an input shaft, a first gear shaft, a first gear and a second gear, the input shaft being the testing and calibration end, the first gear shaft being the transmission end, the first gear being sleeved on the input shaft, and the second gear being sleeved on the first gear shaft and in meshing connection with the first gear.

[0015] The position detection assembly further comprises a second gear shaft, a third gear and a fourth gear, the third gear being sleeved on the input shaft, the fourth gear being sleeveled on the second gear shaft and in meshing connection with the third gear, and the position feedback element being sleeved on the second gear shaft.

[0016] Alternatively, the position detection element further comprises a rack, the rack being in meshing connection with the first gear, and the position feedback element being connected with the rack.

[0017] In an embodiment, the position detection element comprises at least one of an optical sensor, an optical grating sensor, a capacitive grating sensor and a magnetic grating sensor.

[0018] In an embodiment, the torque detection element is cross-stuck on the outer surface of the torsion shaft along the radial direction of the torsion shaft.

[0019] In an embodiment, the controllable load element is configured as a magneto-rheological sensor.

[0020] The application further provides a calibration method of the motor testing device, wherein the motor testing device is the motor testing device as described above, and the calibration method comprises the following steps of:

[0021] In the case that the motor testing device is in communication connection with the torsion calibration device, and the testing and calibration end is in driving connection with the torsion calibration device, the torsion calibration device is controlled to output the torque to the testing and calibration end;

[0022] In the case that the output torque of the torsion calibration device reaches the target calibration torque, the torque value detected by the torque detection element is obtained, and the torque detection element is calibrated according to the difference between the detected torque value and the target calibration torque.

[0023] The application further provides a testing method of the motor testing device, wherein the motor testing device is the motor testing device as described above, and the testing method comprises the following steps of:

[0024] In a case that the motor testing device is electrically connected with the motor to be tested, and the testing calibration end is drivingly connected with the motor to be tested, the control component controls the controllable load to output a preset load torque to the torque shaft, and controls the motor to be tested to output a preset electrical parameter;

[0025] The torque detection component detects the torque under different preset electrical parameters

[0026] The motor testing device further includes a torque calibration device, the motor to be tested, and the motor testing device as described above, and the testing calibration end is drivingly connected with the torque calibration device or the motor to be tested.

[0027] In an embodiment, the torque calibration device includes at least one of a torque calibration instrument and a torque calibration handle.

[0028] The technical solution of the present application can directly sense the slight deformation of the torque shaft during the transmission of the torque, and realize the high-sensitivity detection of the output torque value. Meanwhile, the control component has a dual function: in the calibration stage, when the motor testing device is communicatively connected with the torque calibration device and the testing calibration end is drivingly connected therewith, the control component controls the torque calibration device to apply a torque to the testing calibration end, and when the target calibration torque is reached, the detection value of the torque detection component is acquired, and the calibration is completed according to the difference between the detection value and the target value, thereby improving the measurement accuracy and linearity of the torque detection component in the small torque range; in the testing stage, when the testing calibration end is drivingly connected with the motor to be tested and the device is electrically connected therewith, the control component controls the controllable load to apply a preset load torque, and outputs different preset electrical parameters to the motor to be tested, and synchronously acquires the torque data output by the torque detection component under multiple working conditions, thereby realizing the fine measurement and analysis of the torque response characteristics of the motor in the low load region. Through this integrated calibration and multi-parameter collaborative control technical solution, the motor testing device can have high resolution, low drift and good repeatability in the small torque range, and fundamentally solves the problem of inaccurate small torque detection caused by the lack of effective calibration means and inaccurate control in the traditional testing method. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on the drawings shown.

[0030] Figure 1 The structural schematic diagram of an embodiment of the motor testing device provided by the present application;

[0031] Figure 2 The structural schematic diagram of an embodiment of the motor testing device provided by the present application;Figure 1 Structure diagram of another angle;

[0032] Figure 3 Structure diagram of another embodiment of the motor testing device provided by the application;

[0033] Figure 4 Structure diagram of another angle; Figure 3 Structure diagram of another angle;

[0034] Figure 5 Structure diagram of another angle; Figure 3 Structure diagram of another angle;

[0035] Figure 6 Structure diagram of another angle; Figure 5 Structure diagram of another angle;

[0036] Figure 7 Structure diagram of another angle; Figures 3 to 6 Structure diagram of another angle;

[0037] Figure 8 Structure diagram of another embodiment of the motor testing device provided by the application;

[0038] Figure 9 Structure diagram of another angle; Figure 8 Structure diagram of another angle;

[0039] Figure 10 Flow chart of one embodiment of the calibration method of the motor testing device provided by the application;

[0040] Figure 11 Flow chart of one embodiment of the testing method of the motor testing device provided by the application.

[0041] Explanation of reference numerals:

[0042] 100, motor testing device; 1, motor core; 101, accommodating cavity; 102, first opening; 103, second opening; 104, mounting groove; 11, transmission assembly; 111, transmission end; 112, testing and calibration end; 113, first gear; 114, second gear; 12, first shell; 2, controllable load; 3, torsion shaft; 4, position detection assembly; 41, position feedback; 42, position detection; 43, second gear shaft; 44, third gear; 45, fourth gear; 5, torque detection; 6, second shell; 601, third opening; 7, control assembly; 8, interface assembly; 81, terminal communication interface; 82, torsion calibration device communication interface; 83, motor power supply interface; 84, memory card interface; 85, device power supply port; 9, display assembly; 10, casing; 1001, mounting cavity; 1002, mounting port.

[0043] The objectives, functional features and advantages of the present application will be further illustrated in conjunction with the embodiments with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0045] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0046] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present application.

[0047] The existing test of the torque of the motor cannot accurately detect small torque.

[0048] Therefore, the present application proposes a motor testing device 100, which aims to improve the accuracy and sensitivity of small torque testing of the motor and realize detection of small torque.

[0049] Please refer to Figure 1 and Figure 2 In an embodiment of the present application, the motor testing device 100 comprises:

[0050] The core 1 has a transmission end 111 and a test calibration end 112, and the test calibration end 112 is used to be connected with a torque calibration device or a motor to be tested in transmission;

[0051] The controllable load 2 is used to provide a preset load torque.

[0052] a torsion shaft 3, drivingly connecting the driving end 111 and the controllable load 2;

[0053] a torque detection 5, arranged on the torsion shaft 3, for detecting a torque value output by the torsion shaft 3;

[0054] a control component 7, electrically connected with the controllable load 2 and the torque detection 5 respectively;

[0055] the control component 7 is configured to control the torsion calibration device to output a torque to the test calibration end 112 when the motor testing device 100 is in communication connection with the torsion calibration device and the test calibration end 112 is in driving connection with the torsion calibration device, and acquire a torque value detected by the torque detection 5 when the output torque of the torsion calibration device reaches a target calibration torque, and calibrate the torque detection 5 according to a difference between the detected torque value and the target calibration torque;

[0056] the control component 7 is further configured to control the controllable load 2 to output a preset load torque to the torsion shaft 3 and output a preset electrical parameter to the motor to be tested when the motor testing device 100 is in electrical connection with the motor to be tested and the test calibration end 112 is in driving connection with the motor to be tested, and acquire a torque detected by the torque detection 5 under different preset electrical parameters.

[0057] In the embodiment, the core 1 has the driving end 111 and the test calibration end 112, the test calibration end 112 can be in driving connection with an output shaft of the torsion calibration device or the motor to be tested through a shaft coupling or a quick plug connector, so that power input can be transmitted to the inside of the motor testing device 100 without slip and with high fidelity in both the calibration process and the testing process, thereby providing a stable basis for torque measurement.

[0058] The controllable load 2 is configured to provide a preset load torque, which can be a device with accurately adjustable output resistance such as a magnetic powder brake, an eddy current brake or a servo motor, and is adjusted and controlled by the control component 7 to apply a repeatable load resistance to the torsion shaft 3 in the testing process, so as to simulate the working condition of the motor in actual operation, so that the motor to be tested must output a corresponding torque to maintain operation, thereby establishing a clear mechanical balance relationship and providing a reference working condition for torque detection.

[0059] The torsion shaft 3 drivingly connects the driving end 111 of the core 1 and the controllable load 2 as the only torque transmission path, is made of a metal material with high rigidity and low hysteresis, and is designed in an elongated structure or a hollow shaft form, so as to be capable of generating a measurable elastic torsional deformation under a small torque, which is beneficial to amplify a tiny torque signal and improve system sensitivity.

[0060] The torque detection member 5 is arranged on the torsion shaft 3, and can be a strain gauge sensor attached to the surface of the torsion shaft 3 or a non-contact magnetic elastic sensor, directly sensing the shear strain of the torsion shaft 3 caused by force and converting it into an electrical signal output, to realize real-time and high-resolution detection of the output torque value of the torsion shaft 3. Since the torque detection member 5 is directly integrated on the torque transmission path, the energy loss and mechanical gap influence of the intermediate link can be avoided, and it is particularly suitable for precise capture of small torque.

[0061] The control assembly 7 is electrically connected with the controllable load member 2 and the torque detection member 5, and has a double control logic: in calibration, when the motor test device 100 is in communication connection with the torsion calibration device and the test calibration end 112 is in transmission connection with the torsion calibration device, the control assembly 7 sends an instruction to make the torsion calibration device output torque, and when the target calibration torque is reached, the feedback value of the torque detection member 5 is read, the difference between the two is calculated, and zero point compensation or gain correction is automatically completed to ensure the accuracy of the torque detection member 5 in the low range interval; in testing, when the motor test device 100 is in electrical connection with the motor to be tested and the test calibration end 112 is in transmission connection with the motor to be tested, the control assembly 7 controls the controllable load member 2 to apply a preset load torque, and simultaneously outputs different preset electrical parameters such as voltage, current or frequency to the motor to be tested, synchronously collects the output torque data of the torque detection member 5 under each electrical parameter combination, and realizes fine analysis of the small torque characteristics of the motor under different working conditions.

[0062] In summary, the motor test device 100 realizes power input through the core 1, establishes a controllable test environment through the controllable load member 2, provides torque conduction basis through the torsion shaft 3, realizes sensing of small torque through the torque detection member 5, and realizes switching and control of calibration and testing through the control assembly 7. The cooperation of each component can improve the accuracy, repeatability and automation level of small torque detection, and solve the technical problem that the motor torque test in the prior art cannot accurately detect small torque.

[0063] Please refer to Figure 3 and Figure 4 In an embodiment of the present application, the core 1 includes a transmission assembly 11 having a transmission end 111 and a test calibration end 112; the motor test device 100 further includes a position detection assembly 4 including a position feedback member 41 and a position detection member 42 connected with the position feedback member 41, the position feedback member 41 being in transmission connection with the transmission assembly 11, and the position detection member 42 being used to detect the rotation position or movement position of the position feedback member 41 to obtain the rotation angle of the motor to be tested.

[0064] In the embodiment, the transmission assembly 11 is the core part of the movement 1, the test calibration end 112 of which is used to achieve transmission connection with the motor to be tested or the torque calibration device, so as to ensure reliable transmission of the input power or calibration signal, and the transmission end 111 is used to output torque to the torque shaft 3, forming a complete power transmission path. The position feedback member 41 is in transmission connection with the transmission assembly 11 and can rotate or move linearly synchronously with the transmission assembly 11, so as to truly reflect the motion state of the transmission assembly 11 and indirectly represent the change of the rotation angle of the motor to be tested. The position detection member 42 is connected with the position feedback member 41 and is used to detect the rotation position or movement position of the position feedback member 41 in real time. The position detection member 42 can be a rotary encoder, a grating ruler, a magnetic grating sensor or a capacitive grating sensor and the like sensing element, which converts mechanical displacement into electrical signal output. Through a preset transmission proportional relationship, the motor testing device 100 can convert the displacement of the position feedback member 41 into the actual rotation angle of the motor to be tested. The position detection assembly 4 is directly linked with the transmission assembly 11, the signal transmission path is short and the response is fast, so as to avoid the cumulative error caused by indirect measurement. Especially in small torque testing, the small angular displacement can also be accurately captured by the position detection member 42, and the rotation angle and torque are synchronously and high-precisely collected by cooperating with the torque detection member 5.

[0065] Please refer to Figure 3 and Figure 4 In an embodiment of the present application, the transmission assembly 11 includes an input shaft, a first gear shaft and first and second gears 113 and 114. The input shaft is the test calibration end 112, the first gear shaft is the transmission end 111, the first gear 113 is sleeved on the input shaft, and the second gear 114 is sleeved on the first gear shaft and is in meshing connection with the first gear 113. The position detection assembly 4 further includes a second gear shaft 43, a third gear 44 and a fourth gear 45. The third gear 44 is sleeved on the input shaft, the fourth gear 45 is sleeved on the second gear shaft 43 and is in meshing connection with the third gear 44, and the position feedback member 41 is sleeved on the second gear shaft 43.

[0066] In this embodiment, the input shaft is used as the test calibration end 112, which is used to be connected with the motor to be tested or the torque calibration device for transmission, and receives the input rotary motion. The first gear 113 is sleeved on the input shaft and rotates synchronously with the input shaft. The second gear 114 is sleeved on the first gear shaft and is engaged with the first gear 113, so as to transmit the motion and torque to the first gear shaft. The first gear shaft is connected with the torque shaft 3 as the transmission end 111, so as to realize the power output to the controllable load 2. The gear transmission structure ensures that the main transmission path is stable and reliable, has high transmission efficiency, and has certain centering tolerance capacity. The third gear 44 in the position detection assembly 4 is also sleeved on the input shaft and arranged in parallel with the first gear 113, and rotates synchronously with the input shaft. The fourth gear 45 is sleeved on the second gear shaft 43 and is engaged with the third gear 44, so as to form an independent transmission branch and transmit the rotary motion of the input shaft to the second gear shaft 43. The position feedback part 41 is sleeved on the second gear shaft 43 and rotates synchronously with the second gear shaft 43, so as to truly reflect the angular displacement change of the input shaft. The structure separates the position detection path from the main torque transmission path, so that the interference of the load change on the rotation angle detection signal can be avoided. The second gear shaft 43 is arranged in parallel with the first gear shaft, which is beneficial to realize the compact layout and rigid support in the movement core 1. Through the structure, the motor test device 100 can still maintain the high resolution and stability of the rotation angle signal when detecting small torque. The position detection part 42 can accurately capture the rotation position of the position feedback part 41, and then accurately calculate the rotation angle of the motor to be tested.

[0067] Please refer to Figure 3 and Figure 4 In an embodiment of the present application, the position detection part 42 further comprises a rack, which is engaged with the first gear 113, and the position feedback part 41 is connected with the rack.

[0068] In this embodiment, the rack and the first gear 113 are kept in engagement, when the input shaft is rotated by the motor to be tested, the first gear 113 acts as a driving wheel to drive the rack to move linearly along its length direction, the moving distance of the rack is proportional to the rotation angle of the input shaft. The position feedback member 41 is fixedly connected with the rack and moves linearly synchronously with the rack, converting the rotation movement of the input shaft into a linear displacement signal. The linear displacement truly reflects the change of the rotation angle of the motor to be tested, providing a basis for subsequent angle calculation. The position detection member 42 is used to detect the moving position of the position feedback member 41, which can be a linear displacement sensor such as a grating ruler, a magnetostrictive sensor or a potentiometer type displacement meter, which can collect the displacement of the position feedback member 41 in real time and convert it into an electrical signal output. Through the conversion relationship between the preset gear division circle diameter and the corresponding arc length, the motor testing device 100 can restore the measured linear displacement to the actual rotation angle of the motor to be tested. This structure uses the first gear 113 to drive the main transmission path and the rack transmission branch at the same time, without the need to increase additional power input elements, realizing compact design. Since the rack and the first gear 113 are always in rigid engagement, there is no slip and no lag in the transmission process, ensuring the continuity and accuracy of the rotation angle signal. Especially in small torque test, the small rotation angle can also produce a displacement that can be recognized by a high-precision sensor through the rack, improving the angle detection sensitivity in low-speed or micro-motion working conditions.

[0069] Referring to Figure 5 and Figure 6 In an embodiment of the present application, the movement core 1 further comprises a first housing 12, the first housing 12 has a containing cavity 101, and a first opening 102 and a second opening 103 communicating with the containing cavity 101, the input shaft, the first gear shaft, the first gear 113, the second gear 114, the position feedback member 41, the second gear shaft 43, the third gear 44, the fourth gear 45 and the rack are arranged in the containing cavity 101 respectively, the input shaft extends out of the first housing 12 through the first opening 102, and the first gear shaft extends out of the second housing 6 through the second opening 103.

[0070] In the embodiment, the first shell 12 provides centralized installation space and structural support for the core transmission and detection components such as the input shaft, the first gear shaft, the first gear 113, the second gear 114, the second gear shaft 43, the third gear 44, the fourth gear 45, the rack, and the position feedback element 41, etc. through the accommodating cavity 101 inside it, ensuring that the relative position relationship and good coaxiality of each component are maintained during operation, effectively reducing the motion errors caused by vibration, deformation or external interference. The accommodating cavity 101 forms a closed environment, which protects the internal gear meshing pairs and transmission elements from dust, oil stains, and foreign matter invasion, prolongs the service life of the components, and improves the stability and reliability of the motor testing device 100 during long-term operation. The first opening 102 and the second opening 103 are respectively arranged at opposite ends of the first shell 12, the input shaft extends out of the first shell 12 through the first opening 102, and is used as a test calibration end 112 for transmission connection with the motor to be tested or a torque calibration device, ensuring the continuity and centering accuracy of power input; the first gear shaft extends out of the first shell 12 through the second opening 103, and is connected with the torque shaft 3 as a transmission end 111 to transmit torque to the controllable load element 2, forming a complete power output path. The two end shaft structures make the transmission assembly 11 penetrate through the first shell 12, with reasonable layout and balanced stress, which is beneficial to reduce the additional bending moment of the torque shaft 3 and the input shaft, improve the transmission rigidity and measurement accuracy. All gears, shafts and position feedback elements 41 are integrated in the accommodating cavity 101, with compact structure and efficient space utilization, facilitating assembly and maintenance.

[0071] Please refer to Figures 3 to 6 In an embodiment of the application, the position feedback element 41 is a code disc, at least part of the code disc is inserted between the first gear 113 and the third gear 44; the first shell 12 is provided with a mounting groove 104, and the position detection element 42 is inserted into the mounting groove 104 and abuts against the code disc.

[0072] In the embodiment, the code disc is directly sleeved on the second gear shaft 43 as the position feedback element 41, at least partially extends in the axial direction and is inserted between the first gear 113 and the third gear 44, fully utilizes the axial gap between the adjacent gears on the input shaft, realizes compact layout, avoids occupying the internal space of the first housing 12, and is beneficial to improving the integration and compactness of the movement 1. The code disc rotates synchronously with the second gear shaft 43, and the outer periphery of the code disc is provided with equidistant lines or coding patterns for representing angular displacement information. The first housing 12 is provided with a mounting groove 104, the position detection element 42 is fixed in the mounting groove 104 in a plug-in manner, and the detection surface of the code disc is in abutting or close cooperation with the position detection element 42, thereby forming a stable and reliable signal reading relationship. The position detection element 42 can be an optical sensor or a magneto-electric sensor. When the code disc rotates, the sensor detects the number and frequency of the lines passing through, outputs a corresponding pulse signal, and then calculates the rotation angle, rotation speed and rotation direction of the motor to be tested. Since the position detection element 42 is installed in a plug-in manner, it is convenient to disassemble and replace, and is beneficial to later maintenance and precision calibration. The mounting groove 104 plays a positioning and guiding role on the position detection element 42, ensures that the detection end of the position detection element 42 and the code disc always maintain the correct relative position, and avoids signal distortion or pulse loss caused by deviation or looseness. The structure embeds the code disc in the gear gap, saves space, and directly cooperates the position detection element 42 with the code disc to realize high-resolution and high-response-speed angle detection, especially in small torque testing, which can accurately capture small angle changes and improve the recognition ability of the motor testing device 100 to the movement characteristics of the motor, such as starting and stopping, backstroke and positioning.

[0073] Please refer to Figures 3 to 6 In an embodiment of the present application, the position detection element 42 includes at least one of an optical sensor, a grating sensor, a capacitive sensor, and a magnetic grating sensor.

[0074] In this embodiment, the position detection member 42 is used to detect the rotational or moving position of the position feedback member 41 to obtain the rotation angle of the motor to be tested. When the position feedback member 41 is a code disc, the position detection member 42 adopts an optical sensor to output pulse signals by detecting the periodic change of light flux during the rotation of the code disc, thereby realizing angle measurement, which has the advantages of fast response and low cost. When higher accuracy is required, the position detection member 42 adopts a grating sensor to realize linear or angular displacement detection with sub-micron resolution by using the Moiré fringe effect between the grating ruler and the reading head, which is suitable for testing scenarios with extremely high rotation angle accuracy requirements. In complex working conditions such as oil stains and dust, the position detection member 42 can adopt a capacitive grating sensor to detect the relative displacement between the moving grating and the fixed grating based on the capacitance change principle, which has good anti-pollution ability and stability. In the case of non-contact measurement or long-life operation, the position detection member 42 can adopt a magnetic grating sensor to determine the position by sensing the magnetic field change on the magnetic encoding ruler or magnetic ring, which has the characteristics of solid structure, resistance to harsh environment and maintenance-free. The above-mentioned sensors can select at least one according to actual needs, and are installed in the mounting groove 104 of the first shell 12 to form a detection cooperation with the position feedback member 41 on the code disc, the rack or the second gear shaft 43. By selecting high-precision sensing elements, the motor testing device 100 can still accurately capture the small angular displacement change under small torque conditions, avoiding measurement errors caused by insufficient resolution or signal interference.

[0075] Please refer to Figures 3 to 6 In an embodiment of the present application, the torque detection member 5 is cross-stuck on the outer surface of the torsion shaft 3 along the radial direction of the torsion shaft 3.

[0076] In this embodiment, the torque detection member 5 adopts a strain gauge type sensor, which is symmetrically stuck on the outer surface of the torsion shaft 3 along the radial cross direction of the torsion shaft 3, arranged at ±45° angle relative to the axis of the torsion shaft 3, forming a Wheatstone bridge circuit. When the motor to be tested outputs torque and transmits it to the torsion shaft 3 through the transmission assembly 11, the torsion shaft 3 produces elastic torsional deformation under the action of torque, and the surface material of the torsion shaft 3 produces tensile and compressive deformation under the action of shear stress. Since the strain gauges are cross-stuck in the radial direction, one group of strain gauges is in the tensile strain region, and the other group is in the compressive strain region, the deformation directions of the two are opposite, and the resistance changes are superimposed on each other, which enhances the sensitivity and signal-to-noise ratio of the output signal. This arrangement can directly and efficiently capture the shear strain on the surface of the torsion shaft 3, thereby accurately reflecting the size of the transmitted torque. This structure enables the torque detection member 5 to be directly integrated on the torque transmission path, with fast signal response and high measurement linearity. Especially when detecting small torque, even a small torsional deformation can be identified sensitively, effectively overcoming the small torque detection error caused by insufficient sensitivity in traditional measurement methods.

[0077] Please refer to Figure 7In an embodiment of the present application, the motor tester further comprises a second housing 6, which is arranged between the movement 1 and the controllable load 2, and is provided with a third opening 601, and the torsion shaft 3 and the torque detection component 5 are arranged in the second housing 6, and the end of the torsion shaft 3 away from the controllable load 2 extends out of the second housing 6 through the third opening 601 and is in driving connection with the driving end 111.

[0078] In the embodiment, the second housing 6 is arranged between the movement 1 and the controllable load 2, and is used to accommodate and protect the torsion shaft 3 and the torque detection component 5, forming a closed and stable installation environment. The torsion shaft 3 is arranged in the internal space of the second housing 6 as a whole, and its one end extends out of the housing through the third opening 601 and is in rigid connection with the driving end 111 of the movement 1 or is in butt joint through a shaft coupling, ensuring that the power is transmitted from the movement 1 to the torsion shaft 3. The torque detection component 5 is cross-stuck to the outer surface of the torsion shaft 3 along the radial direction of the torsion shaft 3 and is located in the internal space of the second housing 6 and is protected by the housing, preventing external dust, oil stains, moisture or mechanical collision from causing pollution or damage to the strain gauge, and ensuring the stability and reliability of long-term work. The second housing 6 also has an electromagnetic shielding effect, which reduces the influence of external interference on the signal transmission of the torque detection component 5 and improves the signal-to-noise ratio. The structure can also realize the modular integration of the torsion shaft 3 and the torque detection component 5, facilitating overall assembly, calibration and later maintenance.

[0079] Please refer to Figure 7 In an embodiment of the present application, the controllable load 2 is configured as a magneto-rheological sensor.

[0080] In the embodiment, the controllable load 2 uses a magneto-rheological sensor as a load execution device, which is filled with magneto-rheological fluid inside, and can quickly change the viscosity and shear strength of the fluid when a magnetic field is applied, thereby generating an adjustable damping torque. When the motor to be tested transmits torque to the controllable load 2 through the torsion shaft 3, the magneto-rheological sensor adjusts the excitation current according to the instruction of the control assembly 7, changes the internal magnetic field strength, and makes the magneto-rheological fluid change from a free-flowing state to a solid-like state structure within milliseconds, forming a controllable shear resistance, and then applying an accurate preset load torque to the torsion shaft 3. The load torque and the motor output torque remain in dynamic balance, providing a stable measurement working condition for the torque detection component 5. The magneto-rheological sensor has the characteristics of fast response speed, wide adjustment range, good linearity and strong reversibility, and especially can realize fine adjustment of small load in the low-torque range, meeting the high-precision loading demand of small-torque test.

[0081] Please refer to Figure 8 and Figure 9In an embodiment of the present application, the motor tester further comprises an interface assembly 8 electrically connected with the control assembly 7, the interface assembly 8 comprising at least one of a terminal communication interface 81, a torque calibration device communication interface 82, a motor power supply interface 83, a memory card interface 84, and a device power supply port 85.

[0082] In the present embodiment, the terminal communication interface 81 adopts a USB interface or a wireless communication module, and can be connected with a terminal device such as a computer, a mobile phone or a tablet, to realize real-time uploading of test data and remote monitoring, facilitate generation of a torque-angle curve, a report and a trend analysis graph in the upper computer software, and improve the visualization level and processing efficiency of test results. The torque calibration device communication interface 82 supports data interaction with an external torque calibration device, can receive a calibration instruction or upload a calibration parameter, and ensures traceability and consistency of the calibration process. The motor power supply interface 83 is used to connect a motor to be tested, output adjustable voltage, current or PWM signals to the motor, realize control of the running state of the motor, and meet the test requirements under different electrical parameters. The memory card interface 84 adopts an SD card socket, is used to store test data, calibration records and system logs in a long-time running, supports independent running of the device under the condition of no external terminal, realizes local storage of data, can be used to insert a dongle to realize software authorization verification, prevent the system from being illegally copied or cracked, and protect the safety of intellectual property rights. The device power supply port 85 is used to access an external power supply, provide working power for the entire motor tester, and support wide voltage input to adapt to different use environments.

[0083] Please refer to Figure 8 and Figure 9 In an embodiment of the present application, the motor tester further comprises a display assembly 9 electrically connected with the control assembly 7, the display assembly 9 being used to display the rotation angle of the motor to be tested detected by the displacement detection member, and display the torque value detected by the torque detection member 5.

[0084] In the present embodiment, the display assembly 9 is a core component of human-computer interaction, receives the rotation angle and torque data processed by the control assembly 7 in real time, and presents the test results in an intuitive way. It can continuously display the actual rotation angle of the motor to be tested obtained by the position detection member 42, including the starting angle, the running angle, the return angle or the cumulative rotation number of information, and synchronously display the output torque value measured by the torque detection member 5, which can be expressed as a real-time value, a peak value, a minimum value or a dynamic change trend. The display assembly 9 adopts a liquid crystal display screen or a touch screen, supports digital display, column chart, waveform chart and curve chart and other modes, so that the operating personnel can directly observe the running state of the motor on site without relying on external devices. In the test process, the user can master the rotation angle response speed, the torque output stability, the start-stop characteristics and whether there are abnormal phenomena such as jamming and jitter of the motor under different electrical parameters or load conditions in real time through the display assembly 9, and facilitate quick judgment of the performance of the motor.

[0085] Referring to Figure 8 and Figure 9 In an embodiment of the present application, the motor tester further comprises a housing 10, the housing 10 is provided with a mounting cavity 1001 and a mounting opening 1002 in communication with the mounting cavity 1001, the movement 1, the controllable load 2, the torsion shaft 3, the torque detection component 5 and the position detection assembly 4 are arranged in the mounting cavity 1001, and the test calibration end 112 extends out of the housing 10 through the mounting opening 1002.

[0086] In this embodiment, the housing 10 serves as the support and protection of the overall structure of the main body, and the mounting cavity 1001 in the housing 10 provides a centralized installation space and a stable mechanical environment for the core components such as the movement 1, the controllable load 2, the torsion shaft 3, the torque detection component 5 and the position detection assembly 4. The mounting opening 1002 is arranged on the housing 10, so that the test calibration end 112 can extend from the accommodation cavity 101 to the outside of the housing 10, facilitating the transmission connection with the output shaft of the motor to be tested or the torsion calibration device, and ensuring the continuity and coaxiality of the power input. At the same time, the housing 10 protects the internal components, prevents dust, oil stains, water vapor and foreign matter from entering the mounting cavity 1001, avoids interference with gear meshing, detection signal and transmission precision, and prolongs the service life of the motor testing device 100.

[0087] The present application also provides a calibration method of the motor testing device 100, referring to Figures 1 to 10 The specific structure of the motor testing device 100 is referred to the above-mentioned embodiments. Since the calibration method of the motor testing device 100 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0088] Based on the above-mentioned hardware structure, referring to Figure 10 The calibration method comprises:

[0089] S100, in the case that the motor testing device and the torsion calibration device are in communication connection, and the test calibration end and the torsion calibration device are in transmission connection, the torsion calibration device is controlled to output torque to the test calibration end;

[0090] S200, when the output torque of the torsion calibration device reaches the target calibration torque, the torque value detected by the torque detection component is acquired, and the torque detection component is calibrated according to the difference between the detected torque value and the target calibration torque.

[0091] In this embodiment, the calibration method realizes the calibration of the internal torque detection piece 5 by establishing mechanical connection and data communication between the motor test device 100 and the torque calibration device. In step S100, the output end of the torque calibration device is rigidly connected to the test calibration end 112 of the motor test device 100 through a shaft coupling or a quick connector, ensuring that the applied torque can be transmitted to the movement 1 without loss and without slip. At the same time, through the torque calibration device communication interface 82 in the interface assembly 8, the control assembly 7 of the motor test device 100 establishes bidirectional communication with the torque calibration device, realizes parameter setting and state monitoring. The control assembly 7 sends a target calibration torque instruction to the torque calibration device, such as a preset value of 0.1 N·m, 0.3 N·m, 0.8 N·m, etc., and controls it to gradually load to the corresponding torque level, simulating the input working condition of the motor under different loads. In step S200, when the output torque of the torque calibration device reaches the target calibration torque, the control assembly 7 synchronously reads the torque value detected by the torque detection piece 5, which is derived from the strain gauge signal attached to the outer surface of the torque shaft 3, reflecting the measurement result of the motor test device 100 itself. The detection value is compared with the target calibration torque from the torque calibration device, and the deviation between the two is calculated. Based on the difference, the control assembly 7 automatically executes the calibration algorithm to compensate and correct the zero point offset, gain coefficient or calibration curve of the torque detection piece 5, completing single-point or multi-point linear calibration. This process can be repeated at multiple torque levels, especially covering small torque intervals, to ensure linearity and accuracy in the entire measurement range. Through this method, errors caused by sensor aging, temperature changes, material creep or assembly stress can be effectively eliminated, and the measurement sensitivity and repeatability of the torque detection piece 5 in the low torque range can be improved. The entire calibration process does not require disassembly of the equipment and does not rely on an external independent calibration platform, is simple to operate, has high automation degree, and can be quickly completed in the laboratory or on site. The calibration method gives the motor test device 100 self-calibration capability, ensures the reliability and consistency of the test data, and fundamentally solves the technical problems of inaccurate small torque measurement, error accumulation and unreliable results caused by the lack of effective calibration mechanism in traditional motor torque test devices.

[0092] The application also provides a test method of the motor test device 100, which will be described below with reference to Figures 1 to 11 The specific structure of the motor test device 100 is described in the above embodiments. Since the test method of the motor test device 100 adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described here.

[0093] Based on the above hardware structure, please refer to Figure 11 The test method comprises the following steps:

[0094] S300, in the case that the motor test device is electrically connected with the motor to be tested, and the test calibration end is drivingly connected with the motor to be tested, the controllable load member outputs a preset load torque to the torque shaft, and outputs a preset electrical parameter to the motor to be tested;

[0095] S400, acquiring the torque detected by the torque detection member under different preset electrical parameters.

[0096] In the embodiment, the test method realizes the test of the motor performance through integrated control and multi-parameter collaborative measurement. In step S300, the output shaft of the motor to be tested is rigidly drivingly connected with the test calibration end 112 of the motor test device 100 through a shaft coupling or a quick connector, so as to ensure that the power transmission is without slip and loss; at the same time, the motor to be tested is electrically connected with the motor test device 100 through the motor power supply interface 83 in the interface assembly 8, so as to establish a power supply and control channel. According to the preset test process, the control assembly 7 controls the controllable load member 2 to apply a preset load torque to the torque shaft 3, simulates the resistance working condition of the motor in the actual work, and makes the motor to be tested output a corresponding torque to maintain operation; on the other hand, the control assembly 7 adjusts the power output to apply different preset electrical parameters, such as a set voltage value, a set current value, a PWM duty cycle or a frequency, to the motor to be tested, so as to simulate the running state of the motor under different driving conditions. In step S400, the torque detection member 5 collects the deformation signals of the torque shaft 3 in the transmission process in real time, and converts the deformation signals into electrical signals for output; the control assembly 7 synchronously records the torque value detected by the torque detection member 5 under each set of preset electrical parameters, so as to form a corresponding relationship data set of the electrical parameters and the output torque. The data can be used to draw a torque-voltage curve, a torque-current curve or an efficiency characteristic diagram of the motor, so as to comprehensively evaluate the starting torque, the rated torque, the overload capacity and the dynamic response characteristics of the motor. Especially in the small torque range, since the torque detection member 5 is radially crossed and attached along the torque shaft 3, the torque detection member 5 has high sensitivity and low noise characteristics, can accurately capture weak torque changes, and avoids signal distortion or insufficient resolution. The whole test process is uniformly scheduled by the control assembly 7, so as to realize the synchronous coordination of the load application, the electrical parameter adjustment and the data acquisition, and to ensure the authenticity and repeatability of the test results. Through the method, the motor test device 100 can acquire the output performance of the motor in the full working condition range, especially in the low load, micro-motion, start-stop and other key scenes, and solve the technical problems of inaccurate small torque test and incomplete data analysis caused by scattered control, lagging measurement and insufficient precision in the traditional test method.

[0097] The application further provides a motor testing device, which comprises a torque calibration device, a motor to be tested, and the motor testing device 100, the specific structure of which is described in the above embodiment. Since the motor testing device adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described here. The testing calibration end 112 is in transmission connection with the torque calibration device or the motor to be tested.

[0098] The above is only an exemplary embodiment of the application, and does not limit the patent scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, which is made under the technical concept of the application and by using the content of the specification and drawings, is included in the patent protection scope of the application.

Claims

1. A motor testing device, characterized in that, include: The mechanism has a transmission end and a test and calibration end, wherein the test and calibration end is used to connect to a torque calibration device or the motor under test. A controllable load component used to provide a preset load torque; A torsion shaft connects the transmission end and the controllable load component. A torque detection element is disposed on the torque shaft and is used to detect the torque value output by the torque shaft; The control component is electrically connected to the controllable load component and the torque detection component, respectively. The control component is used to control the torque calibration device to output torque to the test calibration end when the motor testing device and the torque calibration device are in communication connection and the test calibration end is in transmission connection with the torque calibration device, and to obtain the torque value detected by the torque detection device when the output torque of the torque calibration device reaches the target calibration torque, and to calibrate the torque detection device according to the difference between the detected torque value and the target calibration torque. The control component is further configured to, when the motor testing device is electrically connected to the motor under test and the test calibration terminal is drive-connected to the motor under test, control the controllable load component to output a preset load torque to the torque shaft, output preset electrical parameters to the motor under test, and acquire the torque detected by the torque detection component under different preset electrical parameters.

2. The motor testing device as described in claim 1, characterized in that, The mechanism includes a transmission assembly, which has a transmission end and a test and calibration end; The motor testing device further includes a position detection component, which includes a position feedback element and a position detection element connected to the position feedback element. The position feedback element is connected to the transmission component. The position detection element is used to detect the rotational or movement position of the position feedback element in order to obtain the rotation angle of the motor under test.

3. The motor testing device as described in claim 2, characterized in that, The transmission assembly includes an input shaft, a first gear shaft, a first gear, and a second gear. The input shaft is the test calibration end, the first gear shaft is the transmission end, the first gear is sleeved on the input shaft, and the second gear is sleeved on the first gear shaft and meshes with the first gear. The position detection component further includes a second gear shaft, a third gear, and a fourth gear. The third gear is sleeved on the input shaft, the fourth gear is sleeved on the second gear shaft and meshes with the third gear, and the position feedback component is sleeved on the second gear shaft. Alternatively, the position detection component may further include a rack, which meshes with the first gear, and the position feedback component is connected to the rack.

4. The motor testing device as described in claim 2, characterized in that, The position detection device includes at least one of a photoelectric sensor, a grating sensor, a capacitive grating sensor, and a magnetic grating sensor.

5. The motor testing device as described in claim 1, characterized in that, The torque detection element is radially and crosswise attached to the outer surface of the torque shaft.

6. The motor testing device as described in claim 1, characterized in that, The controllable load is configured as a magnetorheological sensor.

7. A calibration method for a motor testing device, characterized in that, The motor testing device is the motor testing device as described in any one of claims 1 to 6, and the calibration method includes: When the motor testing device and the torque calibration device are connected in communication, and the test calibration end is connected in transmission to the torque calibration device, the torque calibration device is controlled to output torque to the test calibration end. When the output torque of the torque calibration device reaches the target calibration torque, the torque value detected by the torque detection element is obtained, and the torque detection element is calibrated based on the difference between the detected torque value and the target calibration torque.

8. A test method for a motor testing device, characterized in that, The motor testing device is the motor testing device as described in any one of claims 1 to 6, and the testing method includes: With the motor testing device electrically connected to the motor under test and the test calibration terminal connected to the drive of the motor under test, the controllable load component is controlled to output a preset load torque to the torque shaft and output preset electrical parameters to the motor under test. The torque detected by the torque sensing element under different preset electrical parameters is obtained.

9. A motor testing device, characterized in that, It includes a torque calibration device, a motor under test, and a motor testing device as described in any one of claims 1 to 6, wherein the test calibration end is connected to the torque calibration device or the motor under test via a transmission.

10. The motor testing equipment as described in claim 9, characterized in that, The torque calibration device includes at least one of a torque calibrator and a torque calibration handle.

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