Motor rotary transformer testing device and testing system

Abstract

The utility model relates to the field of testing devices, in particular to a testing device and a testing system for a rotary transformer of a motor. The motor rotary transformer testing device comprises a dynamometer, a torque limiting mechanism and an oscilloscope. The torque limiting mechanism is located between the dynamometer and the tested motor, a rotating shaft of the dynamometer is connected with the torque limiting mechanism, and a rotating shaft of the tested motor is connected with the torque limiting mechanism; the rotary transformer of the tested motor is electrically connected with the oscilloscope. According to the motor rotary transformer testing device provided by the invention, by arranging the torque limiting mechanism, when the torque output by the rotating shaft of the tested motor exceeds the set torque threshold value, connection between the rotating shaft of the dynamometer and the rotating shaft of the tested motor can be automatically disconnected, so that the rotating shaft of the dynamometer is effectively protected from being damaged.

Description

Technical Field

[0001] The present application relates to the field of testing devices, and in particular to a motor rotary transformer testing device and a testing system. Background Art

[0002] A resolver is an electromagnetic sensor used to measure the angular displacement and angular velocity of a rotating object. As a key component in the drive motors of new energy vehicles, resolvers play an important role in power transmission and conversion, angle measurement, and control. In permanent magnet synchronous motors, resolvers are used as sensors for rotor speed and rotation direction, which are crucial for controlling vehicle speed and forward or reverse motion.

[0003] Resolvers are susceptible to interference from external signals, resulting in reduced sensing accuracy. To ensure proper motor operation, resolvers require regular inspection to maintain stable operation. Conventional resolver testing requires connecting the motor equipped with the resolver to a dynamometer and measuring the resolver's waveform. If the motor's torque increases abnormally or becomes uncontrolled, the dynamometer's shaft can be easily damaged. Utility Model Content

[0004] The purpose of the present application is to provide a motor rotary transformer testing device and a testing system for solving the problem that the rotating shaft of the dynamometer is easily damaged during the test process.

[0005] The present application provides a motor rotary transformer testing device, comprising a dynamometer, a torque limiting mechanism, and an oscilloscope;

[0006] The torque limiting mechanism is located between the dynamometer and the motor under test, the rotating shaft of the dynamometer is connected to the torque limiting mechanism, and the rotating shaft of the motor under test is connected to the torque limiting mechanism;

[0007] The rotary transformer of the motor under test is electrically connected to the oscilloscope.

[0008] In the above technical solution, further comprising a support frame;

[0009] The support frame includes a bottom plate, a first support portion and a second support portion, wherein the first support portion and the second support portion are connected to the bottom plate, and the first support portion and the second support portion are spaced apart;

[0010] The motor under test is installed on the first supporting part, and the dynamometer is installed on the second supporting part.

[0011] In the above technical solution, further, the first support portion includes a support vertical plate;

[0012] The supporting vertical plate is connected to the bottom plate;

[0013] The motor under test is installed on a side of the support plate facing away from the dynamometer; the support plate is provided with a first through hole, and the rotating shaft of the motor under test passes through the first through hole.

[0014] In the above technical solution, further, the torque limiting mechanism includes a torque limiter and a rotating shaft assembly;

[0015] The first connecting portion of the torque limiter is connected to the rotating shaft of the dynamometer, the second connecting portion of the torque limiter is connected to the rotating shaft assembly, and the rotating shaft assembly is connected to the rotating shaft of the motor under test.

[0016] In the above technical solution, further, the shaft assembly includes a flange and a tooling shaft;

[0017] The flange is connected to the second connecting portion, one end of the tooling shaft is connected to the flange, and the other end of the tooling shaft is connected to the shaft of the motor under test.

[0018] In the above technical solution, further comprising a detection module;

[0019] The detection module is installed on the side of the support plate facing the dynamometer; the detection module includes a speed sensor and / or a torque sensor, the speed sensor is used to measure the rotational speed of the shaft assembly in real time, and the torque sensor is used to measure the torque output by the motor under test in real time.

[0020] In the above technical solution, further, the first support portion further includes support legs;

[0021] The support legs are provided on both sides of the support vertical plate, and the support legs are used to connect the support vertical plate and the bottom plate.

[0022] In the above technical solution, further, the second supporting portion further includes an adapter plate, a first fastener and a second fastener;

[0023] The adapter plate is located on a side of the support plate away from the dynamometer, the adapter plate is provided with a first connection hole, and the support plate is correspondingly provided with a second connection hole, and the first fastener passes through the first connection hole and the second connection hole to connect the adapter plate and the support plate;

[0024] The adapter plate is provided with a fixing hole, and the fixing hole is opposite to the mounting hole on the docking flange of the motor under test. The second fastener passes through the mounting hole and is screwed into the fixing hole to mount the motor under test on the adapter plate. The adapter plate is provided with a second through hole, and the second through hole is opposite to the first through hole, so that the rotating shaft of the motor under test passes through the first through hole and the second through hole.

[0025] In the above technical solution, further, the second supporting portion includes a pad;

[0026] The pad is connected to the bottom plate, and the dynamometer is installed on the pad so that the rotating shaft of the dynamometer and the rotating shaft of the motor to be tested are located at the same height.

[0027] The present application also provides a testing system, including the motor rotary transformer testing device described in the above solution.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The motor rotary transformer testing device provided in the present application, by setting a torque limiting mechanism, can automatically disconnect the connection between the dynamometer's shaft and the shaft of the motor being tested when the torque output by the shaft of the motor being tested exceeds the set torque threshold, thereby effectively protecting the shaft of the dynamometer from damage.

[0030] The present application also provides a test system, including the motor rotary transformer test device described in the above solution. Based on the above analysis, it can be seen that the test system also has the above beneficial effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A schematic diagram of the structure of the motor rotary transformer testing device provided in this application;

[0033] Figure 2 A schematic diagram of the structure of the support plate provided for this application;

[0034] Figure 3 A schematic diagram of the structure of the adapter board provided for this application;

[0035] Figure 4 This is a schematic structural diagram of the mating flange surface of the motor under test provided in this application.

[0036] In the figure: 101-dynamometer; 102-motor under test; 103-oscilloscope; 104-wiring harness of rotary transformer; 105-differential probe; 106-base plate; 107-first support part; 108-second support part; 109-support vertical plate; 110-first through hole; 111-torque limiter; 112-flange; 113-tooling shaft; 114-speed sensor; 115-torque sensor; 116-support leg; 117-adapter plate; 118-first connecting hole; 119-second connecting hole; 120-fixing hole; 121-jointing flange; 122-mounting hole; 123-second through hole; 124-rotating shaft of the motor under test. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0038] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0040] Example 1

[0041] See also Figures 1 to 4As shown, the motor resolver testing device provided in this application includes a dynamometer 101, a torque limiting mechanism, and an oscilloscope 103. The torque limiting mechanism is located between the dynamometer 101 and the motor under test 102. The rotating shaft of the dynamometer 101 is connected to the torque limiting mechanism, and the rotating shaft 124 of the motor under test is also connected to the torque limiting mechanism. The resolver of the motor under test 102 is electrically connected to the oscilloscope 103.

[0042] Specifically, before testing the motor's resolver, connect the high-voltage and low-voltage wiring harnesses, water or oil pipes, and other components of the motor under test (102) according to technical requirements. Lead out the resolver's wiring harness (104). The resulting harness is a twisted shielded pair, including positive and negative excitation, positive and negative forward, and positive and negative cosine pairs. Use an isolated differential probe (105) to connect the corresponding wiring harnesses. Inputs: Excitation +, Excitation -; Outputs: Sine +, Sine -, Cosine +, Cosine -. After these connections are complete, connect the other end of the differential probe (105) to an oscilloscope (103).

[0043] When testing the rotary transformer of a motor, the dynamometer 101 can be used as a load for the motor 102 under test to measure the actual torque output by the rotating shaft 124 of the motor under test. Specifically, the motor 102 under test is cooled and given high and low voltages according to technical requirements. The dynamometer 101 is set as a speed loop, and the motor 102 under test is set as a torque loop. The test conditions are set according to the speed and torque conditions required by the technology. The rotary transformer of the motor 102 under test is electrically connected to the oscilloscope 103, which is used to collect the waveforms of the induced voltage and induced current output by the rotary transformer to determine the working state of the rotary transformer. The waveforms collected from a normally operating rotary transformer have the following characteristics: no large or small waves, no distortion, no burrs, should be symmetrical and uniform, the waveform amplitude, the sine and cosine envelope phase difference should not be higher than 12°, and the phase difference between excitation and sine and cosine should not exceed 46°.

[0044] To prevent damage to the rotating shaft of dynamometer 101 during measurement, a torque threshold is set for the torque limiting mechanism. When the torque output by the rotating shaft 124 of the motor under test exceeds the set torque threshold, the torque limiting mechanism automatically disconnects the rotating shaft of dynamometer 101 from the rotating shaft 124 of the motor under test, thereby effectively protecting the rotating shaft of dynamometer 101 from damage.

[0045] In an optional solution of this embodiment, the motor resolver test device further includes a support frame. The support frame includes a base plate 106, a first support portion 107, and a second support portion 108. The first support portion 107 and the second support portion 108 are connected to the base plate 106 and are spaced apart from each other. The motor under test 102 is mounted on the first support portion 107, and the dynamometer 101 is mounted on the second support portion 108.

[0046] In this embodiment, when testing the rotary transformer of the motor, the first support part 107 supports the motor 102 under test, and the second support part 108 supports the dynamometer 101. When the dynamometer 101 and the motor rotate, the relative position between the motor 102 under test and the dynamometer 101 can be stabilized, ensuring the coaxiality of the rotating shaft of the dynamometer 101 and the rotating shaft of the motor 102 under test, thereby avoiding inaccurate testing due to insufficient stability.

[0047] In the optional solution of this embodiment, specifically as follows Figure 1 As shown, the first support portion 107 includes a support vertical plate 109; the support vertical plate 109 is connected to the base plate 106; the motor under test 102 is installed on the side of the support vertical plate 109 away from the dynamometer 101; the support vertical plate 109 is provided with a first through hole 110, and the rotating shaft 124 of the motor under test passes through the first through hole 110.

[0048] In this embodiment, because the rotating shaft 124 of the motor under test and the docking flange 121 are located on the same side, when the docking flange 121 of the motor under test 102 is connected to the support plate 109, the rotating shaft 124 of the motor under test passes through the first through hole 110, thereby enabling the rotating shaft 124 of the motor under test to be connected to the rotating shaft of the dynamometer 101. The motor under test 102 is mounted on the support plate 109 so that the rotating shaft 124 of the motor under test is arranged horizontally. This ensures that the posture of the motor under test 102 under test is consistent with its posture on the vehicle. This allows the motor to simulate its actual operating state during testing, thereby improving the accuracy of the test.

[0049] In an optional solution of this embodiment, the torque limiting mechanism includes a torque limiter 111 and a shaft assembly. The first connection portion of the torque limiter 111 is connected to the shaft of the dynamometer 101, and the second connection portion of the torque limiter 111 is connected to the shaft assembly. The shaft assembly is further connected to the shaft 124 of the motor under test. The shaft assembly is provided to increase the distance between the motor under test 102 and the dynamometer 101, leaving space for the installation of related components and facilitating operation by the tester.

[0050] Specific as Figure 1 As shown, the shaft assembly includes a flange 112 and a tool shaft 113. The flange 112 is connected to the second connection portion of the torque limiter 111. One end of the tool shaft 113 is connected to the flange 112, and the other end of the tool shaft 113 is connected to the shaft 124 of the motor under test through a coupling to achieve power transmission.

[0051] This embodiment may also include a detection module. The detection module is mounted on the side of the support plate 109 facing the dynamometer 101. The detection module includes a speed sensor 114 and / or a torque sensor 115. The speed sensor 114 is used to measure the rotational speed of the shaft assembly in real time, and the torque sensor 115 is used to measure the torque output by the motor 102 under test in real time.

[0052] In this embodiment, Figure 1 As shown, the torque sensor 115 is installed on the supporting plate 109 and is located above the tooling shaft 113. The torque sensor 115 is connected to the host computer and can measure and display the torque of the tooling shaft 113 in real time. It can be used to determine the size and accuracy of the output torque of the tested motor 102 when the tested motor 102 is under torque control, thereby improving the accuracy of the test.

[0053] The speed sensor 114 is installed on the supporting plate 109 and is located below the tooling shaft 113. The speed sensor 114 is connected to the host computer and can measure and display the rotation speed of the tooling shaft 113 in real time. When the dynamometer 101 performs speed control, it can determine the speed and error size of the motor 102 under test.

[0054] Example 2

[0055] The motor rotary transformer testing device in the second embodiment is an improvement on the above embodiment. The technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in the second embodiment.

[0056] In an optional solution of this embodiment, the first support portion 107 further includes support legs 116 ; support legs 116 are provided on both sides of the support vertical plate 109 , and the support legs 116 are used to connect the support vertical plate 109 and the bottom plate 106 .

[0057] In this embodiment, support legs 116 are provided on both sides of the support plate 109, which can effectively improve the stability of the support plate 109 and ensure the coaxiality of the rotating shaft of the dynamometer 101 and the rotating shaft of the motor 102 under test. Especially when the dynamometer 101 and the motor are rotating, the vibration generated by the rotation of the motor can be well buffered to avoid affecting the test due to insufficient stability of the support plate 109.

[0058] In an optional solution of this embodiment, the second support portion 108 further includes an adapter plate 117, a first fastener and a second fastener; the adapter plate 117 is located on the side of the support vertical plate 109 away from the dynamometer 101, the adapter plate 117 is provided with a first connecting hole 118, and the support vertical plate 109 is correspondingly provided with a second connecting hole 119, and the first fastener passes through the first connecting hole 118 and the second connecting hole 119 to connect the adapter plate 117 and the support vertical plate 109.

[0059] The adapter plate 117 is provided with a fixing hole 120, and the fixing hole 120 is opposite to the mounting hole 122 on the docking flange 121 of the motor under test 102. The second fastener passes through the mounting hole 122 and is screwed into the fixing hole 120 to mount the motor under test 102 on the adapter plate 117. The adapter plate 117 is provided with a second through hole 123, and the second through hole 123 is opposite to the first through hole 110, so that the rotating shaft 124 of the motor under test passes through the first through hole 110 and the second through hole 123.

[0060] In this embodiment, for different models of tested motors 102, the sizes and numbers of the mounting holes 122 provided on the docking flange 121 are different. In order to connect different models of tested motors 102 with the support vertical plate 109, the present application provides an adapter plate 117 to connect the tested motor 102 with the support vertical plate 109 to improve the applicability of the device.

[0061] Specific as Figures 2 to 4 As shown, Figure 4 FIG. 1 shows that the surface of the mating flange 121 of the motor 102 under test is provided with eight mounting holes 122 evenly distributed along the circumferential direction, and the mounting holes 122 are M12 threaded holes. Figure 3 The figure shows that adapter plate 117 is provided with eight fixing holes 120 evenly distributed along the circumference. These eight fixing holes 120 are located on the inner circumference and are M12 threaded holes. When connecting motor 102 to adapter plate 117, the eight threaded holes on the mating flange 121 of motor 102 are aligned with the eight threaded holes on the inner circumference of adapter plate 117. Then, M12×1.75 bolts are screwed into the corresponding threaded holes to connect motor 102 to adapter plate 117. The bolts do not penetrate adapter plate 117.

[0062] Figure 3 ] It is shown that the adapter plate 117 is provided with 8 first connection holes 118 evenly distributed along the circumferential direction, and the 8 first connection holes 118 are located on the outer circumference, and the first connection holes 118 are M20 threaded holes. Figure 2 The figure shows eight second connection holes 119 evenly distributed along the circumference of support plate 109. These second connection holes 119 are M20 threaded holes. When connecting adapter plate 117 to support plate 109, the adapter plate 117 is fitted onto the support plate 109, and the eight threaded holes on the outer circumference of adapter plate 117 are aligned with the eight threaded holes on support plate 109. M20×2.5 bolts are then screwed into the corresponding threaded holes to connect adapter plate 117 to support plate 109.

[0063] In an optional solution of this embodiment, the second support portion 108 includes a pad. The pad is connected to the base plate 106, and the dynamometer 101 is mounted on the pad so that the rotating shaft of the dynamometer 101 and the rotating shaft 124 of the motor under test are at the same height to ensure the coaxiality of the rotating shaft of the dynamometer 101 and the rotating shaft of the motor under test 102.

[0064] Specifically, after the motor 102 under test and the dynamometer 101 are installed, a micrometer is used to perform a centering check on the tooling shaft 113, requiring the coaxiality deviation to be ≤3 wires. On this basis, the dynamometer 101 is given rotation speeds of 500rpm and 1000rpm respectively, requiring that the motor 102 under test has no obvious vibration or abnormal noise during rotation, thereby ensuring qualified installation.

[0065] Example 3

[0066] Embodiment 3 of the present application provides a testing system, including the motor rotary transformer testing device of any of the above embodiments, and thus has all the beneficial technical effects of the motor rotary transformer testing device of any of the above embodiments, which will not be repeated here.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. In addition, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means that they are within the scope of the present application and form different embodiments.

Claims

1. A motor rotary transformer testing device, characterized in that: Includes a dynamometer, torque limiting mechanism, and oscilloscope; The torque limiting mechanism is located between the dynamometer and the motor under test, the rotating shaft of the dynamometer is connected to the torque limiting mechanism, and the rotating shaft of the motor under test is connected to the torque limiting mechanism; The rotary transformer of the motor under test is electrically connected to the oscilloscope.

2. The motor rotary transformer testing device according to claim 1, characterized in that: Also includes a support frame; The support frame includes a bottom plate, a first support portion and a second support portion, wherein the first support portion and the second support portion are connected to the bottom plate, and the first support portion and the second support portion are spaced apart; The motor under test is installed on the first supporting part, and the dynamometer is installed on the second supporting part.

3. The motor rotary transformer testing device according to claim 2, characterized in that: The first supporting portion includes a supporting vertical plate; The supporting vertical plate is connected to the bottom plate; The motor under test is installed on a side of the support plate facing away from the dynamometer; the support plate is provided with a first through hole, and the rotating shaft of the motor under test passes through the first through hole.

4. The motor rotary transformer testing device according to claim 3, characterized in that: The torque limiting mechanism includes a torque limiter and a rotating shaft assembly; The first connecting portion of the torque limiter is connected to the rotating shaft of the dynamometer, the second connecting portion of the torque limiter is connected to the rotating shaft assembly, and the rotating shaft assembly is connected to the rotating shaft of the motor under test.

5. The motor rotary transformer testing device according to claim 4, characterized in that: The rotating shaft assembly includes a flange and a tooling rotating shaft; The flange is connected to the second connecting portion, one end of the tooling shaft is connected to the flange, and the other end of the tooling shaft is connected to the shaft of the motor under test.

6. The motor rotary transformer testing device according to claim 4, characterized in that: Also includes detection modules; The detection module is installed on the side of the support plate facing the dynamometer; the detection module includes a speed sensor and / or a torque sensor, the speed sensor is used to measure the rotational speed of the shaft assembly in real time, and the torque sensor is used to measure the torque output by the motor under test in real time.

7. The motor rotary transformer testing device according to claim 3, characterized in that: The first support portion further includes support legs; The support legs are provided on both sides of the support vertical plate, and the support legs are used to connect the support vertical plate and the bottom plate.

8. The motor rotary transformer testing device according to claim 3, characterized in that: The second supporting portion further includes an adapter plate, a first fastener and a second fastener; The adapter plate is located on a side of the support plate away from the dynamometer, the adapter plate is provided with a first connection hole, and the support plate is correspondingly provided with a second connection hole, and the first fastener passes through the first connection hole and the second connection hole to connect the adapter plate and the support plate; The adapter plate is provided with a fixing hole, and the fixing hole is opposite to the mounting hole on the docking flange of the motor under test. The second fastener passes through the mounting hole and is screwed into the fixing hole to mount the motor under test on the adapter plate. The adapter plate is provided with a second through hole, and the second through hole is opposite to the first through hole, so that the rotating shaft of the motor under test passes through the first through hole and the second through hole.

9. The motor rotary transformer testing device according to claim 2, characterized in that: The second supporting portion includes a pad; The pad is connected to the bottom plate, and the dynamometer is installed on the pad so that the rotating shaft of the dynamometer and the rotating shaft of the motor to be tested are located at the same height.

10. A testing system, characterized in that: The invention comprises the motor rotary transformer testing device according to any one of claims 1 to 9.

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