Motor torque measuring device and motor testing system

Abstract

The utility model provides a motor torque measuring device and a motor testing system, and relates to the technical field of motor testing devices, the motor torque measuring device comprises a mounting assembly, a pressure sensing assembly and a force arm contact; the mounting assembly comprises a hollow structure; the pressure sensing assembly comprises a first pressure sensor and a second pressure sensor; the force arm contact comprises two symmetrically arranged contacts. After the force arm contact is fixedly connected with the shell of the tested motor, the force arm contact can slightly rotate around the axis of the shaft of the tested motor along with the shell of the tested motor. The first pressure sensor and the second pressure sensor are used for measuring the pressure in the positive and negative directions of the moment arm contact respectively, so that the dynamic torque of the measured motor during positive and negative rotation can be measured. The motor torque measuring device can prevent a measuring element of the motor torque measuring device from rotating at a high speed along with a measured motor shaft, avoids interference and influence of rotating centrifugal force on sensitive elements such as a strain gauge, can improve the measuring precision and the stability of each rotating speed interval, and reduces the cost.

Description

Technical Field

[0001] This utility model relates to the technical field of motor testing devices, and in particular to a motor torque measuring device and a motor testing system. Background Technology

[0002] Torque measurement is a key test item in the motor testing process, and its accuracy and stability have a significant impact on the evaluation of motor power and efficiency.

[0003] Torque measurement in high-speed motors typically employs dynamic torque sensors. In existing technologies, dynamic torque sensors generally utilize strain gauge technology for torque measurement. Strain gauge technology calculates torque by measuring the strain of an elastic element; its working principle is based on the resistance strain gauge principle. In a dynamic torque sensor, the strain gauge is securely mounted on the elastic shaft, serving as the key sensitive element for torque measurement. When torque is applied to the elastic shaft, the shaft undergoes a minute deformation, which is captured by the strain gauge and converted into an electrical signal for output.

[0004] However, with the technological advancements in high-speed motors and the increasing market demand, higher requirements are being placed on torque measurement sensors suitable for high-torque, high-speed motors. At high speeds, the strain gauges of the sensitive element are affected by centrifugal force, leading to increased technical difficulty in obtaining accurate torque data and a significant rise in testing costs. Utility Model Content

[0005] The purpose of this invention is to provide a motor torque measuring device to solve the technical problem that the strain gauge, a sensitive element, is subject to interference under high-speed motor conditions in the prior art.

[0006] The motor torque measuring device provided by this utility model includes a mounting assembly, a pressure sensing assembly, and a lever arm contact.

[0007] The mounting assembly includes a hollow structure, which includes a first surface and a second surface arranged opposite to each other; the mounting assembly is used to connect to the bearing housing of the motor under test.

[0008] The pressure sensing component includes a first pressure sensor and a second pressure sensor; the first pressure sensor is connected to the first surface, the second pressure sensor is connected to the second surface, and the force-receiving surface of the first pressure sensor and the force-receiving surface of the second pressure sensor are arranged relatively parallel to each other.

[0009] The lever arm contact includes two symmetrically arranged contacts, which respectively contact the force-receiving surfaces of the first pressure sensor and the second pressure sensor; the lever arm contact is used to connect to the housing of the motor under test.

[0010] Furthermore, the contact point makes contact with the central region of the force-receiving surface of the first pressure sensor;

[0011] The contact point is in contact with the central region of the force-bearing surface of the second pressure sensor.

[0012] Furthermore, the contact makes line contact with the force-receiving surface of the first pressure sensor;

[0013] The contact point makes line contact with the force-bearing surface of the second pressure sensor.

[0014] Furthermore, the surface of the contact point that contacts the force-bearing surface of the first pressure sensor is an arc surface;

[0015] The surface of the contact point that contacts the force-bearing surface of the second pressure sensor is an arc surface.

[0016] Furthermore, the mounting assembly includes a base plate and a fixing plate;

[0017] The fixing plate has a first hollow portion, the substrate has a second hollow portion, the fixing plate is connected to the substrate, and the first hollow portion and the second hollow portion communicate to form the hollow structure;

[0018] The first hollow portion includes a first surface and a second surface disposed opposite to each other;

[0019] One end of the lever arm contact is provided with a mounting component, and the second hollow portion surrounds the outside of the mounting component.

[0020] Furthermore, the substrate is detachably connected to the fixing plate.

[0021] Furthermore, the substrate is provided with a first positioning member, and the fixing plate is provided with a second positioning member, wherein the first positioning member and the second positioning member are engaged and inserted into each other.

[0022] Furthermore, threaded holes are provided at both ends of the substrate.

[0023] Furthermore, the top of the mounting assembly is provided with a lifting device.

[0024] The purpose of this invention is also to provide a motor testing system, including the motor torque measuring device provided by this invention.

[0025] This utility model provides a motor torque measuring device, including a mounting assembly, a pressure sensing assembly, and a lever arm contact. The mounting assembly includes a hollow structure with a first surface and a second surface arranged opposite to each other. The mounting assembly is used to connect to the bearing housing of the motor under test. The pressure sensing assembly includes a first pressure sensor and a second pressure sensor. The first pressure sensor is connected to the first surface, and the second pressure sensor is connected to the second surface. The force-bearing surfaces of the first and second pressure sensors are arranged parallel to each other. The lever arm contact includes two symmetrically arranged contacts, which respectively contact the force-bearing surfaces of the first and second pressure sensors. The lever arm contact is used to connect to the housing of the motor under test. After the lever arm contact is fixedly connected to the housing of the motor under test, the lever arm contact can rotate slightly around the axis of the motor shaft as the housing of the motor under test rotates. By using the first and second pressure sensors to measure the pressure of the lever arm contact in both directions, the dynamic torque of the motor under test during forward and reverse rotation can be measured. It can avoid the measuring element of the motor torque measuring device from rotating at high speed with the shaft of the motor being tested, and avoid the interference and influence of the centrifugal force of rotation on sensitive elements such as strain gauges. It can improve the measurement accuracy and stability in each speed range, provide stable and reliable test data, improve safety, and reduce costs. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the motor torque measuring device provided in this embodiment of the utility model;

[0028] Figure 2 This is a bottom view of the motor torque measuring device provided in this embodiment of the utility model;

[0029] Figure 3 This is a front view of the motor torque measuring device provided in this embodiment of the utility model;

[0030] Figure 4 yes Figure 3 Sectional view along line A-A.

[0031] Icons: 1 - First pressure sensor; 2 - Fixing plate; 3 - Second pressure sensor; 4 - Lever arm contact; 41 - Contact; 42 - Mounting component; 5 - Third connecting bolt; 6 - Second connecting bolt; 7 - First connecting bolt; 8 - Positioning pin; 9 - Fourth connecting bolt; 10 - Lifting component; 11 - Base plate. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] This utility model provides a motor torque measuring device and a motor testing system. Several embodiments are given below to describe in detail the motor torque measuring device and motor testing system provided by this utility model.

[0034] Example 1

[0035] The motor torque measuring device provided in this embodiment, such as Figures 1 to 4 As shown, the device includes a mounting assembly, a pressure sensing assembly, and a lever arm contact 4. The mounting assembly includes a hollow structure with a first surface and a second surface arranged opposite to each other. The mounting assembly is used to connect to the bearing housing of the motor under test. The pressure sensing assembly includes a first pressure sensor 1 and a second pressure sensor 3. The first pressure sensor 1 is connected to the first surface, and the second pressure sensor 3 is connected to the second surface. The force-bearing surface of the first pressure sensor 1 and the force-bearing surface of the second pressure sensor 3 are arranged parallel to each other. The lever arm contact 4 includes two symmetrically arranged contacts 41, which respectively contact the force-bearing surfaces of the first pressure sensor 1 and the second pressure sensor 3. The lever arm contact 4 is used to connect to the housing of the motor under test.

[0036] After the lever arm contact 4 is fixedly connected to the housing of the motor under test, the lever arm contact 4 can rotate slightly around the axis of the motor shaft along with the housing of the motor under test. The first pressure sensor 1 and the second pressure sensor 3 are used to measure the pressure on the lever arm contact 4 in both forward and reverse directions, thereby measuring the dynamic torque of the motor under test during forward and reverse rotation. This method avoids the measuring element of the motor torque measuring device rotating at high speed with the shaft of the motor under test, avoiding interference and influence of centrifugal force on sensitive elements such as strain gauges. It improves measurement accuracy and stability across different speed ranges, provides stable and reliable test data, enhances safety, and reduces costs.

[0037] Specifically, the first surface is located at the top of the hollow structure, and the second surface is located at the bottom of the hollow structure. The mounting assembly is used for fixed connection to the bearing housing of the motor under test. The first pressure sensor 1 is fixedly connected to the first surface, and the second pressure sensor 3 is fixedly connected to the second surface. The distance between the first and second surfaces needs to be strictly controlled so that the two contacts 41 respectively contact the force-bearing surfaces of the first and second pressure sensors 1 and 3. The force-bearing surfaces of the first and second pressure sensors 1 and 3 are opposite to each other and parallel to each other. The lever arm contact 4 is positioned between the first and second sensors.

[0038] Furthermore, contact 41 contacts the central region of the force-receiving surface of the first pressure sensor 1; contact 41 also contacts the central region of the force-receiving surface of the second pressure sensor 3.

[0039] Contact 41 is in contact with the center area of ​​the force-receiving surface of the first pressure sensor 1, and contact 41 is in contact with the center area of ​​the force-receiving surface of the second pressure sensor 3, which enables the measurement data to be more accurate.

[0040] Furthermore, contact 41 makes line contact with the force-bearing surface of the first pressure sensor 1; contact 41 also makes line contact with the force-bearing surface of the second pressure sensor 3.

[0041] The contact 41 makes line contact with the force-bearing surface of the first pressure sensor 1 and with the force-bearing surface of the second pressure sensor 3, which enables the measurement data to be more accurate.

[0042] Furthermore, the surface of the contact 41 that contacts the force-bearing surface of the first pressure sensor 1 is an arc surface; the surface of the contact 41 that contacts the force-bearing surface of the second pressure sensor 3 is an arc surface.

[0043] Specifically, the contact 41 that contacts the first pressure sensor 1 is a protruding structure. The protruding structure is semi-cylindrical and protrudes towards the force-bearing surface of the first pressure sensor 1. The surface of the protruding structure that contacts the force-bearing surface of the first pressure sensor 1 is an arc surface, which can make the measurement data more accurate.

[0044] The contact 41 that contacts the second pressure sensor 3 is a raised structure. The raised structure is semi-cylindrical and protrudes towards the force-bearing surface of the second pressure sensor 3. The surface of the raised structure that contacts the force-bearing surface of the second pressure sensor 3 is an arc surface, which can make the measurement data more accurate.

[0045] Furthermore, the mounting assembly includes a base plate 11 and a fixing plate 2; the fixing plate 2 has a first hollow portion, the base plate 11 has a second hollow portion, the fixing plate 2 is connected to the base plate 11, and the first hollow portion and the second hollow portion communicate to form a hollow structure; the first hollow portion includes a first surface and a second surface that are disposed opposite to each other; one end of the lever arm contact 4 is provided with a mounting member 42, and the second hollow portion surrounds the outside of the mounting member 42.

[0046] Specifically, the substrate 11 includes a first end face and a second end face disposed opposite to each other, and the fixing plate 2 is fixedly connected to the first end face. The first hollow portion and the second hollow portion communicate to form a hollow structure. The second hollow portion penetrates through the first end face and the second end face.

[0047] The first surface is located at the top of the first hollow structure, and the second surface is located at the bottom of the second hollow structure. The hollow structure has a rectangular through hole, and the outer contour of the fixing plate 2 is rectangular. The first surface has a countersunk bolt hole that penetrates the top surface of the fixing plate 2. The second surface has a countersunk bolt hole that penetrates the bottom surface of the fixing plate 2. The first pressure sensor 1 is threadedly connected to the countersunk bolt hole on the first surface via a first connecting bolt 7, thus fixing the first pressure sensor 1 to the first surface. The second pressure sensor 3 is threadedly connected to the countersunk bolt hole on the second surface via the first connecting bolt 7, thus fixing the second pressure sensor 3 to the second surface. In this embodiment, the measuring range of both the first pressure sensor 1 and the second pressure sensor 3 is 0kN-5kN.

[0048] One end of the lever arm contact 4 is provided with a mounting part 42, and the second hollow part surrounds the outside of the mounting part 42. The end face of the mounting part 42 facing the outside of the base plate 11 is flush with the second end face. The mounting part 42 is a rectangular plate, and bolt holes are provided at the four corners of the mounting part 42. The second connecting bolt 6 is threaded into the bolt holes to fix the lever arm contact 4 to the housing of the motor under test.

[0049] Furthermore, the substrate 11 and the fixing plate 2 are detachably connected. The connection method can be a snap-fit ​​or a threaded connection, etc., which facilitates the assembly and disassembly of the substrate 11 and the fixing plate 2.

[0050] In this embodiment, the fixing plate 2 is mounted on the base plate 11 by the third connecting bolt 5.

[0051] Furthermore, the substrate 11 is provided with a first positioning member, and the fixing plate 2 is provided with a second positioning member, and the first positioning member and the second positioning member are engaged and inserted.

[0052] The first positioning element can be a positioning pin 8, and the second positioning element can be a positioning hole, or the first positioning element can be a positioning groove, and the second positioning element can be a positioning protrusion, etc.

[0053] The fixing plate 2 is installed in the accurate position on the base plate 11 by the cooperation and insertion of the first positioning member and the second positioning member.

[0054] In this embodiment, the fixing plate 2 is provided with second positioning members at both ends, and the base plate 11 is provided with two first positioning members to achieve more accurate positioning.

[0055] Furthermore, threaded holes are provided at both ends of the substrate 11.

[0056] The base plate 11 has four bolt holes at both ends. The bearing seat of the motor under test is fixedly connected to the base plate 11 by connecting the fourth connecting bolt 9 to the bolt holes.

[0057] Furthermore, a lifting device 10 is provided on the top of the mounting assembly.

[0058] Specifically, the top two ends of the base plate 11 are respectively provided with lifting eye bolts, which are used as lifting parts 10 to facilitate lifting during the installation process.

[0059] Example 2

[0060] The motor testing system provided in this embodiment includes the motor torque measuring device provided in Embodiment 1. After the lever arm contact 4 is fixedly connected to the housing of the motor under test, the lever arm contact 4 can rotate slightly around the axis of the motor shaft along with the housing of the motor under test. The first pressure sensor 1 and the second pressure sensor 3 are used to measure the pressure of the lever arm contact 4 in the forward and reverse directions, respectively, thereby measuring the dynamic torque of the motor under test when it rotates in both directions. This avoids the measuring element of the motor torque measuring device from rotating at high speed with the shaft of the motor under test, avoids the interference and influence of the centrifugal force of rotation on sensitive elements such as strain gauges, improves the measurement accuracy and stability in each speed range, provides stable and reliable test data, improves safety, and reduces costs.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A motor torque measuring device, characterized in that, Includes mounting components, pressure sensing components, and lever arm contacts; The mounting assembly includes a hollow structure, which includes a first surface and a second surface arranged opposite to each other; the mounting assembly is used to connect to the bearing housing of the motor under test. The pressure sensing component includes a first pressure sensor and a second pressure sensor; the first pressure sensor is connected to the first surface, the second pressure sensor is connected to the second surface, and the force-receiving surface of the first pressure sensor and the force-receiving surface of the second pressure sensor are arranged relatively parallel to each other. The lever arm contact includes two symmetrically arranged contacts, which respectively contact the force-receiving surfaces of the first pressure sensor and the second pressure sensor; the lever arm contact is used to connect to the housing of the motor under test.

2. The motor torque measuring device according to claim 1, characterized in that, The contact point is in contact with the central region of the force-receiving surface of the first pressure sensor; The contact point is in contact with the central region of the force-bearing surface of the second pressure sensor.

3. The motor torque measuring device according to claim 1, characterized in that, The contact point makes line contact with the force-bearing surface of the first pressure sensor; The contact point makes line contact with the force-bearing surface of the second pressure sensor.

4. The motor torque measuring device according to claim 1, characterized in that, The surface of the contact point that contacts the force-bearing surface of the first pressure sensor is an arc surface; The surface of the contact point that contacts the force-bearing surface of the second pressure sensor is an arc surface.

5. The motor torque measuring device according to claim 1, characterized in that, The mounting assembly includes a base plate and a fixing plate; The fixing plate has a first hollow portion, the substrate has a second hollow portion, the fixing plate is connected to the substrate, and the first hollow portion and the second hollow portion communicate to form the hollow structure; The first hollow portion includes a first surface and a second surface disposed opposite to each other; One end of the lever arm contact is provided with a mounting component, and the second hollow portion surrounds the outside of the mounting component.

6. The motor torque measuring device according to claim 5, characterized in that, The substrate is detachably connected to the fixing plate.

7. The motor torque measuring device according to claim 5, characterized in that, The substrate is provided with a first positioning member, and the fixing plate is provided with a second positioning member, wherein the first positioning member and the second positioning member are engaged and inserted into each other.

8. The motor torque measuring device according to claim 5, characterized in that, The substrate has threaded holes at both ends.

9. The motor torque measuring device according to claim 1, characterized in that, The top of the mounting assembly is equipped with a lifting device.

10. A motor testing system, characterized in that, The motor torque measuring device includes any one of claims 1-9.

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