CN110608826B - Device for dynamically measuring real-time stress of motor - Google Patents
Device for dynamically measuring real-time stress of motor Download PDFInfo
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- CN110608826B CN110608826B CN201910953528.3A CN201910953528A CN110608826B CN 110608826 B CN110608826 B CN 110608826B CN 201910953528 A CN201910953528 A CN 201910953528A CN 110608826 B CN110608826 B CN 110608826B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2268—Arrangements for correcting or for compensating unwanted effects
- G01L1/2281—Arrangements for correcting or for compensating unwanted effects for temperature variations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/108—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving resistance strain gauges
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/24—Devices for sensing torque, or actuated thereby
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention relates to a device for dynamically measuring real-time stress of a motor, which comprises a stress strain barrel, wherein the stress strain barrel comprises a barrel body, a fixed plate and a flange plate, the barrel body consists of a first barrel body connected with the fixed plate and a second barrel body connected with the flange plate, the fixed plate, the first barrel body, the second barrel body and the flange plate are of an integrated structure, a barrel-shaped cavity structure with a closed top end and an open bottom end is integrally formed, a shear strain gauge and an axial pressure strain gauge are arranged on the inner wall of the first barrel body, and a pressure contrast strain gauge and an axial pressure temperature compensation strain gauge are arranged on the inner wall of the second barrel body. According to the technical scheme, the shearing strain gauge, the axial pressure strain gauge, the pressure contrast strain gauge and the axial pressure temperature compensation strain gauge are respectively arranged on the inner wall of the stressed strain cylinder, so that the axial pressure and the output torque force born by the motor can be dynamically measured in real time, the measuring accuracy is higher, and the functions are more comprehensive.
Description
Technical Field
The invention relates to a device for dynamically measuring real-time stress of a motor.
Background
Currently, common motor torque measurement methods can be divided into a transmission method and an energy conversion method. The transmission method is to calculate the motor torque by monitoring the physical parameter change of the transmission torque elastic element; the energy conversion method is to indirectly measure torque by measuring other parameters such as heat energy, electric energy and the like according to the law of conservation of energy. The energy conversion method has available finished equipment, but has the defects of larger volume, high requirements on working environment and the like, and has limited application. The transmission method can be designed into measuring devices with various shapes and volumes by means of elastic elements, and has the advantages of strong adaptability, higher precision and most wide application.
In the category of a transmission method, the domestic visible motor force measurement related method only has torque measurement, and no method or equipment for simultaneously measuring torque and axial force is known. Axial force measurements are seen on many devices, such as the drilling machinery, transportation, construction, etc. industries, primarily monitoring axial forces of a rod or shaft. Monitoring devices based on transmission methods are not known that can measure torque and axial pressure simultaneously. In addition, the existing measuring device is characterized in that a stress piece is directly attached to the outer surface of a columnar measured component, and when the measuring device works, the measuring device and the stress piece are extremely easy to rub, damage is caused, and measuring precision or failure is affected.
Disclosure of Invention
The invention aims to provide a device for dynamically measuring the real-time stress of a motor, which can simultaneously measure the axial compressive stress and the circumferential shear stress of the motor so as to obtain the axial force and the torque; meanwhile, the strain gauge of the device is arranged inside the steel structure, so that the device is stable in performance and not easy to damage.
In order to achieve the above purpose, the present invention adopts the following technical scheme: including installing the atress strain section of thick bamboo between motor and motor unable adjustment base, atress strain section of thick bamboo include the barrel, fix fixed plate and the flange board of fixing in the barrel bottom on the barrel top, the barrel constitute by the first barrel that links to each other with the fixed plate and the second barrel that links to each other with the flange board, fixed plate, first barrel, second barrel and flange board be integrated into an organic whole structure, and wholly form the open tubular cavity structure in top, the bottom, first barrel and the internal diameter of second barrel equal, the external diameter of first barrel is less than the external diameter of second barrel, the diameter of fixed plate and the external diameter phase coincidence of first barrel, be equipped with shear force foil gage and axial pressure foil gage on the inner wall of first barrel, shear force foil gage and axial pressure foil gage follow the even interval arrangement of inner wall of first barrel and the level that is located, the inner wall of second barrel on be equipped with pressure contrast foil gage and axial pressure foil gage, pressure foil gage and axial strain gauge temperature compensation set up and axial foil gage and axial strain gauge temperature compensation set respectively, axial foil gauge and axial strain gauge set up respectively.
The two groups of shear strain gauges and the two groups of axial pressure strain gauges are located at the middle height of the inner wall of the first cylinder body, and the two shear strain gauges in each group are arranged along the mirror image of the horizontal line and form included angles of +/-45 degrees with the horizontal line respectively, and the intersection points of the two shear strain gauges in each group and the horizontal line coincide.
The two groups of pressure contrast strain gages and the two groups of axial pressure temperature compensation strain gages are positioned at the middle height of the inner wall of the second cylinder.
The shear strain gauge, the axial pressure strain gauge, the pressure contrast strain gauge and the axial pressure temperature compensation strain gauge are foil-type resistance strain gauges, wherein: the setting direction of the resistance wire in the axial pressure temperature compensation strain gauge is vertical to the axis of the stressed strain barrel, and the setting direction of the resistance wire in the pressure contrast strain gauge and the axial pressure strain gauge is parallel to the axis of the stressed strain barrel.
The wall thickness ratio of the first cylinder body to the second cylinder body is smaller than 1:2, the ratio of the cross section of the second cylinder to the first cylinder is greater than 2.5:1.
The fixed plate and the motor fixing base are connected through screws, screw holes connected with the motor fixing base are formed in the fixed plate, the outer diameter of the flange plate is larger than that of the second cylinder, the inner diameter of the flange plate is smaller than that of the second cylinder, and the flange plate is connected with the motor stator in a welding mode.
The stress strain barrel is a steel strain barrel.
According to the technical scheme, the shearing strain gauge, the axial pressure strain gauge, the pressure contrast strain gauge and the axial pressure temperature compensation strain gauge are respectively arranged on the inner wall of the stressed strain cylinder, so that the axial pressure and the output torque force born by the motor can be dynamically measured in real time, the measuring accuracy is higher, and the functions are more comprehensive.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a state of use of the present invention;
FIG. 4 is a schematic circuit diagram of the torque measurement of the present invention;
FIG. 5 is a schematic circuit diagram of the axial force contrast measurement of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
The device for dynamically measuring the real-time stress of the motor as shown in fig. 1,2 and 3 comprises a stress strain barrel arranged between the motor and a motor fixing base, wherein the stress strain barrel is preferably a steel strain barrel and can be made of 45# steel. The stress strain cylinder comprises a cylinder body 1, a fixed plate 2 fixed at the top end of the cylinder body 1 and a flange plate 3 fixed at the bottom end of the cylinder body 1, wherein the cylinder body 1 consists of a first cylinder body 11 connected with the fixed plate 2 and a second cylinder body 12 connected with the flange plate 3, the fixed plate 2, the first cylinder body 11, the second cylinder body 12 and the flange plate 3 are of an integrated structure, a cylinder cavity structure with a closed top end and an open bottom end is integrally formed, the inner diameters of the first cylinder body 11 and the second cylinder body 12 are equal, the outer diameter of the first cylinder body 11 is smaller than the outer diameter of the second cylinder body 12, and the diameter of the fixed plate 2 is identical with the outer diameter of the first cylinder body 11. Specifically speaking, whole atress strain section of thick bamboo is cavity structure, and inside diameter is even, and the outside adopts the variable cross section design, includes four sections altogether: namely, the fixed plate 2 forms a structure fixed end A, the first cylinder 11 forms a strain measurement section B, the second cylinder 12 forms a temperature compensation section C, the flange plate 3 forms a motor connection section D, namely, the whole stress-strain cylinder adopts a four-section type connection structure, and the advantage is that: 1) The compressive rigidity of the strain measurement section B is less than 40% of that of the temperature compensation section C, so that the strain measurement section B is easy to generate a monitorable strain; the deformation of the temperature compensation section C is smaller, and the carrier serving as the temperature compensation sheet is more stable; 2) The structure is simple, multiple functions are realized, and axial strain, shear strain, temperature compensation and axial strain comparison can be monitored; 3) The structure is compact, the processing is convenient, and the design can be adjusted according to the size and the use space of the motor; 4) The temperature compensation section C is immediately adjacent to the strain measurement section B, minimizing the temperature differential effect.
Further, the inner wall of the first cylinder 11 is provided with a shear strain gauge 4 and an axial pressure strain gauge 5, the shear strain gauge 4 and the axial pressure strain gauge 5 are uniformly arranged at intervals along the inner wall of the first cylinder 11 and are positioned at the same height, the inner wall of the second cylinder 12 is provided with a pressure contrast strain gauge 6 and an axial pressure temperature compensation strain gauge 7, the pressure contrast strain gauge 6 and the axial pressure temperature compensation strain gauge 7 are uniformly arranged at intervals along the inner wall of the second cylinder 12 and are positioned at the same height, the pressure contrast strain gauge 6 and the axial pressure temperature compensation strain gauge 7 are respectively positioned under the shear strain gauge 4 and the axial pressure strain gauge 5, the shear strain gauge 4, the axial pressure strain gauge 5, the pressure contrast strain gauge 6 and the axial pressure temperature compensation strain gauge 7 are respectively arranged in two groups, each group of shear strain gauge 4 is provided with two, each group of axial pressure strain gauge 5, the pressure contrast strain gauge 6 and the axial pressure temperature compensation strain gauge 7 are respectively arranged at intervals of 180 degrees, namely, each group of shear strain gauge 4, each group of axial strain gauge 5, each group of axial strain gauge 6 and each axial pressure temperature compensation strain gauge 7 are respectively arranged at intervals of 180 degrees, and each group of strain gauge 4 is respectively arranged at intervals of 180 degrees; the two groups of pressure contrast strain gauges 6 are symmetrically arranged at intervals of 180 degrees, and the two groups of axial pressure temperature compensation strain gauges 7 are symmetrically arranged at intervals of 180 degrees and are spaced from the pressure contrast strain gauges 6 by 90 degrees. The pressure contrast strain gage 6 is used for detecting the axial strain of the strain pressure cylinder temperature compensation section C, comparing the axial strain with the strain value of the strain measurement section B, and checking the reliability of axial stress measurement.
The connection relationship between the strain gauges is as follows:
1. And (5) measuring axial force.
The two groups of axial pressure strain gauges 5 and the two groups of axial pressure temperature compensation strain gauges 7 form a full-bridge circuit, and the axial pressure strain gauges 5 and the axial pressure temperature compensation strain gauges 7 are mutually connected at intervals and connected into a measuring instrument.
2. And (5) measuring torque.
The two groups of shear strain gauges 4 form a full-bridge circuit, and strain gauges in the same group are adjacently connected and connected with a measuring instrument.
The full bridge circuit schematic is shown in fig. 4, wherein: e is bridge voltage, E 0 is output voltage; during compressive strain measurement, an axial pressure temperature compensation strain gauge is arranged at the positions R g2 and R g4; in shear strain measurement, R g1、Rg2 is a group, and R g3、Rg4 is a group.
3. And (5) comparing and measuring axial force. By means of two equivalent fixed resistors R, two groups of pressure contrast strain gauges 6 are connected into a full-bridge circuit to be connected with a measuring instrument.
The schematic circuit diagram of the axial force contrast measurement is shown in fig. 5, in which: e is bridge voltage, E 0 is output voltage; pressure contrast strain gages were placed at positions R g1 and R g2.
Further, the wall thickness ratio of the first cylinder 11 to the second cylinder 12 is less than 1:2, the ratio of the cross section of the second cylinder 12 to the first cylinder 11 is greater than 2.5:1, the axial pressure temperature compensation strain gauge is reliably applicable because the temperature compensation section C has a much smaller strain than the strain measurement section B and the axial pressure temperature compensation strain gauge has been arranged in a direction to eliminate the strain effect.
Further, the two groups of shear strain gauges 4 and the two groups of axial pressure strain gauges 5 are located at the middle height of the inner wall of the first cylinder 11, and the two shear strain gauges 4 in each group are arranged along the mirror image of the horizontal line and have included angles of +/-45 degrees with the horizontal line, and the intersection points of the two shear strain gauges 4 in each group and the horizontal line coincide. The arrangement mode can eliminate the temperature influence of the wires, can eliminate the whole bending strain and the compression tensile strain, and finally calculates the torsion force through the calibrated elastic modulus.
Further, the two sets of pressure contrast strain gages 6 and the two sets of axial pressure temperature compensation strain gages 7 are located at the middle height of the inner wall of the second cylinder.
Further, the shear strain gauge 4, the axial pressure strain gauge 5, the pressure contrast strain gauge 6 and the axial pressure temperature compensation strain gauge 7 are foil-type resistance strain gauges, wherein: the setting direction of the resistance wire in the axial pressure temperature compensation strain gauge 7 is vertical to the axis of the stress strain barrel, and the setting direction of the resistance wire in the pressure contrast strain gauge 6 and the axial pressure strain gauge 5 is parallel to the axis of the stress strain barrel.
The fixed plate 2 is connected with the motor fixed base through screws, screw holes 21 connected with the motor fixed base are formed in the fixed plate 2, the outer diameter of the flange plate 3 is larger than that of the second cylinder 12, the inner diameter of the flange plate 3 is smaller than that of the second cylinder 12, and the flange plate 3 is welded with the motor stator 100.
The following description of the working principle is made by means of a typical connection of the invention:
When the device is used, the motor is connected to the support or the base through the device, the motor output shaft and the connecting piece are connected with the reduction gearbox, and the reduction gearbox is connected with the drill rod through the clamp.
1. The axial pressure or tension applied to the drill rod is transmitted to the stress strain barrel through the reduction gearbox and the motor, and the stress strain barrel generates compression or tension strain, so that the axial pressure or tension value is calculated. The axial pressure temperature compensation strain gauge resistance wire is perpendicular to the stress axis direction, and the deformation amount of the temperature compensation section is smaller than that of the strain measurement section, so that the strain amount of the temperature compensation strain gauge is considered to be 0.
In the full bridge circuit, the bridge voltage E, the output voltage E 0, the strain calculation formula is:
ε0＝2e0/(EKs)；
wherein: k s is the strain rate of the strain gage.
The integral stress calculation formula is as follows:
N＝ε0EtA；
Wherein: n is pressure, E t is elastic modulus of the strain cylinder material, and A is sectional area of the strain cylinder.
2. And (5) comparing axial pressure.
And the parameters are acquired by adopting a full-bridge circuit, and the calculation formula is the same as that above. The difference is that the cross-sectional area (A) of the strain barrel adopts the cross-sectional area of the temperature compensation section. The accuracy of the strain measurement section axial stress is checked by the pressure contrast value.
3. And (5) torque force calculation. When the drill rod works, various friction or resistance are met, and the torque output by the motor is different. And calculating the magnitude of the output torque by combining the strain quantity of the shear strain gauge and the torsional rigidity of the calibrated strain barrel detected in advance.
In the full bridge circuit, the bridge voltage E, the output voltage E 0, the shear strain calculation formula is:
ε0＝e0/(EKs)；
wherein: k s is the strain rate of the strain gage.
The integral torsion calculation formula is as follows:
T＝ε0GIp＝ε0Kg；
Wherein: t is torsion, G is shear modulus of the strain barrel material, I p is polar moment of inertia of the section of the strain barrel, and K g is a detection and calibration torsional rigidity coefficient.
Examples:
The stress strain barrel adopts No. 45 steel, the height is 50mm, the height of the strain measurement section B is 27mm, and the outer diameter is 50mm; the height of the temperature compensation section C is 12mm, and the outer diameter is 60mm; the inner diameter of the cylindrical cavity enclosed by the fixing plate 2, the first cylinder 11, the second cylinder 12 and the flange plate 3 is 42mm, and the height is 39mm. And installing four resistance strain gages according to the arrangement mode, and performing pressure and torsion calibration on the pressure strain barrel to obtain the compression stiffness coefficient and the torsion stiffness coefficient. All the strain gauges have the same parameters, and the specific steps are as follows:
The area of the strain foil is 3 x 5mm, the measuring structure material is constantan, the carrier material is polyimide, the thickness is 45 mu m, the nominal resistance is 120, the working temperature is in the range of-10 to 115 ℃, the temperature coefficient (115+/-10) is 10 -6/K, the minimum bending curvature radius at the reference temperature is 10mm, and the mechanical hysteresis is 0.5 to 1 mu m/m.
The device is arranged on a small-sized drilling machine support, a motor, a cylindrical planet gear reduction box and a drill rod clamp are arranged, a resistance strain gauge is connected to a data acquisition unit, and the acquisition unit is connected with a programmed singlechip through a data wire. The motor and the instrument are powered by an 18V lithium iron phosphate battery. Drilling test is carried out by using the drilling machine to suburban soil layers, the drilling depth is 3.5m, the upper 1.5m soil layer shows torque of 2-5 N.m, the pressure is 19-35N, and the axial contrast pressure is 20-37N; the lower 2.5m soil layer shows torque of 5-20 N.m, pressure of 30-80N and axial contrast pressure of 31-79N. The measuring data of the independent drill rod is very similar to that of other external torquemeters and pressure meters. Meanwhile, the axial contrast pressure of the device has little difference from the main pressure measuring pressure, and the maximum difference is about 5%. The above situation illustrates that the compressive stress measurement is accurate and reliable. And then, the trial drilling is continued near the drilling hole, and all the displayed data are stable and have strong similarity, and the difference between the data and the independent measurement data of other external torsions and pressure gauges is 3-5%.
In conclusion, the dynamic motor real-time stress measuring device has good stability and adaptability, can accurately measure the strain value of the strain barrel in real time, and calculates and displays the axial pressure (tensile force) and the torsion force applied to the motor in real time.
The invention has the beneficial effects that: 1) The invention can dynamically measure the axial pressure and the output torque force of the motor in real time; 2) According to the invention, the shear strain gauge, the axial pressure strain gauge, the pressure contrast strain gauge and the axial pressure temperature compensation strain gauge are respectively arranged, so that the accuracy of measurement is higher, and the functions are more comprehensive; 3) According to the arrangement mode of the shear strain gauge and the axial pressure strain gauge, the shear strain and the axial pressure strain can be accurately measured, and further the torsion and the axial pressure of the motor are obtained; 4) The invention has compact appearance and reasonable structure.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. The utility model provides a device of dynamic measurement motor real-time stress which characterized in that: including installing the atress strain section of thick bamboo between motor and motor unable adjustment base, atress strain section of thick bamboo include barrel (1), fix fixed plate (2) on barrel (1) top and fix flange board (3) in barrel (1) bottom, barrel (1) constitute by first barrel (11) that link to each other with fixed plate (2) and with flange board (3) second barrel (12) that link to each other, fixed plate (2), first barrel (11), second barrel (12) and flange board (3) as an organic whole structure, and wholly form the open tubular cavity structure in top, the open tubular cavity structure in bottom, first barrel (11) equal with the internal diameter of second barrel (12), the external diameter of first barrel (11) is less than the external diameter of second barrel (12), the diameter of fixed plate (2) coincide with the external diameter of first barrel (11), be equipped with shear gauge (4) and axial pressure gauge (5) on the inner wall of first barrel (11), pressure gauge (4) and pressure gauge (5) be equipped with the axial gauge (6) and the same in the axial gauge (6) and the interval that the axial gauge (6) is equipped with in the same, the pressure contrast strain gauge (6) and the axial pressure temperature compensation strain gauge (7) are uniformly arranged at intervals along the inner wall of the second cylinder (12) and are located at the same height, the pressure contrast strain gauge (6) and the axial pressure temperature compensation strain gauge (7) are respectively located under the shear strain gauge (4) and the axial pressure strain gauge (5), the shear strain gauge (4), the axial pressure strain gauge (5), the pressure contrast strain gauge (6) and the axial pressure temperature compensation strain gauge (7) are respectively provided with two groups, each group of shear strain gauge (4) is provided with two groups, and each group of axial pressure strain gauge (5), the pressure contrast strain gauge (6) and the axial pressure temperature compensation strain gauge (7) are respectively provided with one group.
2. The apparatus for dynamically measuring real-time stress of a motor according to claim 1, wherein: the two groups of shear strain gauges (4) and the two groups of axial pressure strain gauges (5) are located at the middle height of the inner wall of the first cylinder body (11), and the two shear strain gauges (4) in each group are arranged along the mirror image of the horizontal line and form included angles of +/-45 degrees with the horizontal line respectively, and the intersection points of the two shear strain gauges (4) in each group and the horizontal line coincide.
3. The apparatus for dynamically measuring real-time stress of a motor according to claim 1, wherein: the two groups of pressure contrast strain gauges (6) and the two groups of axial pressure temperature compensation strain gauges (7) are positioned at the middle height of the inner wall of the second cylinder.
4. The apparatus for dynamically measuring real-time stress of a motor according to claim 1, wherein: the shear strain gauge (4), the axial pressure strain gauge (5), the pressure contrast strain gauge (6) and the axial pressure temperature compensation strain gauge (7) are foil-type resistance strain gauges, wherein: the setting direction of the resistance wire in the axial pressure temperature compensation strain gauge (7) is vertical to the axis of the stress strain barrel, and the setting direction of the resistance wire in the pressure contrast strain gauge (6) and the axial pressure strain gauge (5) is parallel to the axis of the stress strain barrel.
5. The apparatus for dynamically measuring real-time stress of a motor according to claim 1, wherein: the wall thickness ratio of the first cylinder (11) to the second cylinder (12) is less than 1:2, the ratio of the cross section of the second cylinder (12) to the first cylinder (11) is greater than 2.5:1.
6. The apparatus for dynamically measuring real-time stress of a motor according to claim 1, wherein: the fixed plate (2) and the motor fixing base are connected through screws, screw holes (21) connected with the motor fixing base are formed in the fixed plate (2), the outer diameter of the flange plate (3) is larger than that of the second cylinder body (12), the inner diameter of the flange plate (3) is smaller than that of the second cylinder body (12), and the flange plate (3) is connected with the motor stator (100) in a welding mode.
7. The apparatus for dynamically measuring real-time stress of a motor according to claim 1, wherein: the stress strain barrel is a steel strain barrel.
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| CN114526850A (en) * | 2021-12-31 | 2022-05-24 | 杭州安脉盛智能技术有限公司 | Online monitoring system and monitoring method for fan tower barrel aiming at fastening bolt |
| CN115479711B (en) | 2022-10-19 | 2023-05-23 | 中国科学院武汉岩土力学研究所 | A hard shell inclusion stress gauge and monitoring system for three-dimensional stress in underground engineering |
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| CH707008A1 (en) * | 2012-09-27 | 2014-03-31 | Kistler Holding Ag | Strain transmitter. |
| CN204535901U (en) * | 2015-01-06 | 2015-08-05 | 南车株洲电力机车研究所有限公司 | Threaded fastener pre-tightening force detection device |
| CN105300802B (en) * | 2015-10-20 | 2017-11-03 | 哈尔滨工业大学 | A kind of light-wall pipe two-dimensional state of stress stress-strain measurement device and method |
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