CN114199487A - Motor shell vibration fatigue test device and test method - Google Patents
Motor shell vibration fatigue test device and test method Download PDFInfo
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- CN114199487A CN114199487A CN202111483299.7A CN202111483299A CN114199487A CN 114199487 A CN114199487 A CN 114199487A CN 202111483299 A CN202111483299 A CN 202111483299A CN 114199487 A CN114199487 A CN 114199487A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 73
- 238000010998 test method Methods 0.000 title abstract description 5
- 238000012360 testing method Methods 0.000 claims abstract description 40
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention relates to the technical field of motors and discloses a motor shell vibration fatigue test device and a test method. The two ends of the motor shell can be respectively connected with a motor small-head hoisting plate and a motor large-head hoisting plate in the test assembly, and the output end of the vibration exciter assembly can apply load to the motor small-head hoisting plate or the motor large-head hoisting plate so as to perform vibration fatigue test on the motor shell. Through the structure, the motor shell vibration fatigue test device can test the motor shell independently, and is strong in pertinence and high in test efficiency.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor shell vibration fatigue test device and a test method.
Background
The motor mainly functions to generate driving torque as a power source of various machines, and the motor for an automobile is a power source of an electric automobile, which is an important component of the electric automobile. Because the electric automobile is frequently started, accelerated, decelerated and stopped during actual running, the processes are all completed under the driving action of the motor, and the processes all bring frequent vibration to the motor, which requires the motor to have higher vibration fatigue life.
The motor shell is an important component of the motor as a protective structure of the outmost layer of the motor, and the motor shell has to be guaranteed to have high vibration fatigue life so as to ensure the motor to have high vibration fatigue life. In the prior art, a reliability test of a motor assembly generally combines a motor, a reducer and an inverter into one assembly, and the fatigue strength of the three-in-one assembly is checked in a bench test mode.
However, the existing vibration fatigue test has the disadvantages that a plurality of parts need to be installed, the used tool is complex, the consumed time is long, the efficiency is low, and the overall cost is high; in addition, the whole motor is taken as a test object, so that the pertinence is avoided, the design redundancy cannot be found, and the lightweight design is not facilitated.
Disclosure of Invention
The invention aims to provide a motor shell vibration fatigue testing device which can be used for independently testing a motor shell and has strong pertinence and high testing efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a motor housing vibration fatigue testing apparatus comprising:
the calibration assembly comprises three baffle plates, a screw rod, a nut and a force loading displayer, the three baffle plates are slidably arranged on the screw rod in a penetrating mode and are arranged at intervals, the force loading displayer can be clamped between a first baffle plate and a second baffle plate, a motor shell can be clamped between the second baffle plate and a third baffle plate, and the nut can be screwed on the screw rod to enable the force loading displayer to be clamped between the first baffle plate and the second baffle plate and enable the motor shell to be clamped between the second baffle plate and the third baffle plate;
the testing assembly comprises a small motor head hoisting plate, a large motor head hoisting plate, a vibration exciter assembly and a hoisting frame, wherein the small motor head hoisting plate and the large motor head hoisting plate are connected to the hoisting frame through hoisting steel wires;
and the strain detection assembly is used for detecting the strain of the preset part of the motor shell.
As a preferred scheme of the motor casing vibration fatigue test device, the strain detection assembly comprises a strain gauge and a strain gauge, the strain gauge is electrically connected with the strain gauge, and the strain gauge is attached to the surface of a preset part of the motor casing.
As a preferred scheme of the motor shell vibration fatigue test device, the vibration exciter assembly comprises a vibration exciter and a vibration exciting loading rod, the vibration exciting loading rod is connected to the output end of the vibration exciter, and the vibration exciting loading rod is used for applying load to the motor small-end hoisting plate or the motor large-end hoisting plate.
As a preferable scheme of the motor casing vibration fatigue testing device, the exciter assembly further comprises a control element, the control element is electrically connected with the exciter, and the control element is used for controlling the output load of the exciter.
As a preferable scheme of the motor shell vibration fatigue test device, the center line of the excitation loading rod and the center line of the motor shell are arranged in parallel at intervals.
As an optimal scheme of the vibration fatigue test device for the motor shell, bolt connecting holes are formed in the motor small-head hoisting plate and the motor large-head hoisting plate, and two ends of the motor shell are connected to the motor small-head hoisting plate and the motor large-head hoisting plate through connecting bolts respectively.
As a preferable scheme of the motor shell vibration fatigue test device, the length of one of the motor small-head hoisting plate and the motor large-head hoisting plate in transmission connection with the output end of the vibration exciter assembly is greater than that of the other.
The invention also aims to provide a motor shell vibration fatigue test method which not only can independently test the motor shell, has strong pertinence and high test efficiency, but also can simulate the actual working condition of the motor and has high accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vibration fatigue test method for a motor shell is used for performing a vibration fatigue test by using the vibration fatigue test device for the motor shell provided by any one of the technical schemes, and comprises the following steps:
s1, determining a preset part for detecting a strain detection assembly, and connecting the strain detection assembly to the preset part;
s2, installing the motor shell into the calibration assembly;
s3, applying acting force to the force loading display and the motor shell to enable the acting force loaded by the force loading display to reach a preset acting force, and recording a detection value T of the strain detection assembly;
s4, mounting the motor shell into a test assembly;
s5, applying a load to the motor small-end hoisting plate or the motor large-end hoisting plate by using a vibration exciter assembly, and continuously increasing the load until the value detected by the strain detection assembly reaches K.T, wherein K is a safety coefficient;
s6, performing a vibration fatigue test by using the vibration exciter assembly, wherein if the vibration fatigue cycle number of the motor shell is lower than 1 multiplied by 107Secondly, judging that the fatigue life of the motor shell is unqualified; if the number of vibration fatigue cycles of the motor case is greater than or equal to 1 × 107And judging that the fatigue life of the motor shell is qualified.
As a preferable scheme of the vibration fatigue test method for the motor shell, when K is less than 1.6, if the vibration fatigue cycle number of the motor shell is less than 1 x 107Secondly, judging that the fatigue life of the motor shell is unqualified; when K is more than or equal to 1.6 and less than or equal to 1.8, if the vibration fatigue cycle number of the motor shell is less than 1 x 107Judging that the fatigue life of the motor shell is not qualified, and if the vibration fatigue cycle number of the motor shell is higher than 1 multiplied by 107Judging that the fatigue life of the motor shell is qualified; when K is more than 1.8, if the vibration fatigue cycle number of the motor shell is more than 1 multiplied by 107And secondly, judging that the fatigue life of the motor shell is qualified, and designing redundancy exists in the motor shell.
As a preferable scheme of the vibration fatigue test method for the motor housing, in step S1, the maximum position of the strain of the motor housing is analyzed by a computer aided engineering, and the position is used as the preset position for the strain detection module to detect.
As a preferred scheme of the motor shell vibration fatigue test method, when strain analysis is performed on the motor shell by using computer aided engineering, a preset torque M is applied to the motor shell, and the preset torque M is obtained through computer aided engineering analysis and road spectrum working conditions.
As a preferable scheme of the motor housing vibration fatigue test method, the preset acting force is greater than or equal to a ratio of the preset torque M to a distance between an output end of the vibration exciter assembly and the motor.
As a preferable scheme of the vibration fatigue test method for the motor housing, in step S2, the force application indicator is clamped between the first baffle and the second baffle, the motor housing is clamped between the second baffle and the third baffle, and the clamping of the force application indicator and the motor housing is realized by screwing a nut on a screw.
As a preferable scheme of the vibration fatigue test method for the motor housing, in step S3, a force is applied to the force application display and the motor housing by screwing the nut on the screw, and the force is adjusted.
As a preferable scheme of the vibration fatigue test method for the motor housing, in step S4, two ends of the motor housing are respectively connected to the motor small-head hoisting plate and the motor large-head hoisting plate.
The invention has the beneficial effects that:
the invention provides a motor shell vibration fatigue test device which comprises a calibration component, a test component and a strain detection component, wherein the strain detection component is used for detecting strain of a preset part of a motor shell, a force loading display in the calibration component can be clamped between a first baffle and a second baffle, the motor shell can be clamped between the second baffle and a third baffle, a nut is screwed on a screw rod and then clamps the force loading display between the first baffle and the second baffle, and the motor shell is clamped between the second baffle and the third baffle so as to calibrate the applied load of a vibration fatigue test of the motor shell. The two ends of the motor shell can be respectively connected with a motor small-head hoisting plate and a motor large-head hoisting plate in the test assembly, and the output end of the vibration exciter assembly can apply load to the motor small-head hoisting plate or the motor large-head hoisting plate so as to perform vibration fatigue test on the motor shell. Through the structure, the motor shell vibration fatigue test device can test the motor shell independently, and is strong in pertinence and high in test efficiency.
The invention provides a vibration fatigue test method for a motor shell, which can be used for independently testing the motor shell, has strong pertinence and higher test efficiency, and can apply a load close to the actual working condition of a motor to the motor shell in a calibration mode, so that the load in the vibration fatigue test is close to the actual working condition, and the test accuracy is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a calibration component in a vibration fatigue testing apparatus for a motor housing according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a test assembly in the vibration fatigue test device for the motor housing according to the embodiment of the invention;
fig. 3 is a flowchart of a vibration fatigue testing method for a motor housing according to an embodiment of the present invention.
In the figure:
1. a motor housing; 2. a force loading display; 3. a screw; 41. a first baffle plate; 42. a second baffle; 43. a third baffle plate; 5. a strain gauge; 6. a connecting wire; 7. a strain gauge; 9. a hoisting frame; 10. hoisting the steel wire; 11. hoisting a plate by a small head of the motor; 12. hoisting a plate by a large end of the motor; 13. exciting a loading rod; 14. a vibration exciter; 15. a control element; 16. and connecting the bolts.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first feature is directly connected to the second feature, or that the first feature is not directly connected to the second feature but is connected to the second feature via another feature. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the vibration fatigue test device and the test method for the motor shell provided by the invention is further described by the specific implementation mode with the help of the attached drawings.
The embodiment provides a vibration fatigue test device for a motor shell, which can independently use the motor shell as a test object, as shown in fig. 1-2, and comprises a calibration component, a test component and a strain detection component, wherein the strain detection component is used for detecting strain of a preset part of the motor shell 1, before a vibration fatigue test is carried out on the motor shell 1, the motor shell 1 is firstly installed in the calibration component for calibration so as to determine the strain condition of the motor shell 1 when the motor shell 1 is installed in the test component for the vibration fatigue test, namely, the load condition borne by the motor shell 1 when the motor shell 1 is installed in the test component for the vibration fatigue test is determined, so that the load when the motor shell 1 is subjected to the vibration fatigue test is close to the actual working condition, the accuracy of the test is improved.
In this embodiment, the calibration assembly includes three baffle plates, a screw rod 3, a nut, and a force loading display 2, where the three baffle plates are a first baffle plate 41, a second baffle plate 42, and a third baffle plate 43, the first baffle plate 41, the second baffle plate 42, and the third baffle plate 43 are slidably disposed through the screw rod 3 and are disposed at intervals, the force loading display 2 can be clamped between the first baffle plate 41 and the second baffle plate 42, the motor housing 1 can be clamped between the second baffle plate 42 and the third baffle plate 43, and the nut can be screwed on the screw rod 3 to clamp the force loading display 2 between the first baffle plate 41 and the second baffle plate 42, so that the motor housing 1 is clamped between the second baffle plate 42 and the third baffle plate 43. And the nut can also be screwed through screwing on the screw rod 3, so that the clamping force of the force loading display 2 and the motor shell 1 can be adjusted, and the motor shell 1 can simulate the load under the actual working condition in the calibration process conveniently.
It will be appreciated that as the motor housing 1 and the force loading indicator 2 both interact with the second stop 42, the forces to which the motor housing 1 and the force loading indicator 2 are subjected are equal.
Preferably, the strain detection assembly comprises a strain gauge 5 and a strain gauge 7, the strain gauge 5 and the strain gauge 7 are electrically connected through a connecting wire 6, and the strain gauge 5 is attached to the surface of the preset part of the motor housing 1 and used for detecting the strain of the preset part of the motor housing 1 in the calibration assembly and the test assembly.
In this embodiment, the test assembly includes a small-head hoisting plate 11 of the motor, a large-head hoisting plate 12 of the motor, a vibration exciter assembly and a hoisting frame 9, the hoisting frame 9 is fixedly arranged at a certain position to hoist the component, the small-head hoisting plate 11 of the motor and the large-head hoisting plate 12 of the motor are both connected to the hoisting frame 9 through hoisting steel wires 10 to realize suspension, and two ends of the motor housing 1 are respectively connected to the small-head hoisting plate 11 of the motor and the large-head hoisting plate 12 of the motor. The output end of the vibration exciter assembly is connected to the motor small-head hoisting plate 11 or the motor large-head hoisting plate 12 in a transmission mode and used for applying load to the motor small-head hoisting plate 11 or the motor large-head hoisting plate 12 so as to carry out vibration fatigue testing.
Specifically, the length of one of the motor small-end hoisting plate 11 and the motor large-end hoisting plate 12, which is in transmission connection with the output end of the vibration exciter assembly, is greater than that of the other, so that the output end of the vibration exciter assembly can apply acting force on the motor housing 1 conveniently.
Preferably, the vibration exciter assembly comprises a vibration exciter 14 and a vibration exciting loading rod 13, the vibration exciting loading rod 13 is connected to an output end of the vibration exciter 14, the vibration exciting loading rod 13 can be abutted against the motor small-head hoisting plate 11 or the motor large-head hoisting plate 12, and the vibration exciting loading rod 13 is used for applying a load to the motor small-head hoisting plate 11 or the motor large-head hoisting plate 12. Specifically, the excitation loading rod 13 can abut against the motor small-end hoisting plate 11, and the excitation loading rod 13 loads the motor housing 1 from the motor small-end hoisting plate 11. Preferably, the center line of the excitation loading rod 13 is parallel to the center line of the motor housing 1 at intervals, so that the load applied by the excitation loading rod 13 can generate torque on the motor housing 1, the simulation of the actual working condition of the motor is facilitated, and the accuracy of the subsequent vibration fatigue test is improved.
In this embodiment, the exciter assembly further comprises a control element 15, the control element 15 is electrically connected to the exciter 14, the control element 15 is used for controlling the output load of the exciter 14, and an operator can control the output load of the exciter 14 through the control element 15 to enable the strain of the motor housing 1 to reach a preset strain state. In this embodiment, the control element 15 is a computer, so that the operator can easily adjust the output load of the exciter 14. In other embodiments, the control element 15 may also be a controller, and the controller may be a centralized or distributed controller, for example, the controller may be a single-chip microcomputer, or may be formed by a plurality of distributed single-chip microcomputers, and the single-chip microcomputers may run a control program to control the vibration exciter 14 to implement its function.
Through the structure, the motor shell vibration fatigue test device can test the motor shell 1 independently, and is strong in pertinence and high in test efficiency.
The embodiment also provides a vibration fatigue test method for a motor casing, which is used for performing a vibration fatigue test by using the vibration fatigue test device for the motor casing provided by the technical scheme, and as shown in fig. 3, the vibration fatigue test method for the motor casing comprises the following steps:
s1, determining a preset part for detecting the strain detection assembly, and connecting the strain detection assembly to the preset part.
That is, first, a predetermined portion is determined on the motor housing 1 as a portion for strain detection, and the strain at this portion is detected. Specifically, utilize computer aided engineering to analyze the biggest position that takes place to meet an emergency of motor casing 1 to regard this position as the detection component that meets an emergency and carry out the predetermined position that detects, make the detection component that meets an emergency can detect great strain value, be convenient for follow-up detection to the motor casing 1 condition of meeting an emergency. Preferably, when the motor shell 1 is subjected to strain analysis by using computer aided engineering, a preset torque M is applied to the motor shell 1, and the preset torque M is obtained through computer aided engineering analysis and road spectrum working conditions, so that the preset torque M can accurately reflect the load condition of the motor under the actual working condition.
S2, installing the motor shell 1 into the calibration assembly.
That is, after the strain detecting assembly is connected, the motor housing 1 is mounted into the calibration assembly. Specifically, the force loading displayer 2 is clamped between the first baffle plate 41 and the second baffle plate 42, the motor housing 1 is clamped between the second baffle plate 42 and the third baffle plate 43, the force loading displayer 2 and the motor housing 1 are clamped through the screwing of the nuts on the screw rods 3, and the motor housing 1 is installed in the calibration assembly.
And S3, applying acting force to the force loading display 2 and the motor shell 1, enabling the acting force loaded by the force loading display 2 to reach the preset acting force, and recording the detection value T of the strain detection assembly.
That is, the force is applied to the force application display 2 and the motor housing 1, the force displayed by the force application display 2 reaches the preset force, and the detection value T of the strain detection assembly at this time is recorded. Specifically, by screwing the nut on the screw 3, the nut locks the third baffle 43, so that the clamping force of the first baffle 41 and the second baffle 42 is applied to the display 2, the second baffle 42 and the third baffle 43 clamp the motor housing 1, and the clamping force of the motor housing 1 can be adjusted by screwing the nut.
In this embodiment, the preset acting force is greater than or equal to a ratio of the preset torque M to a distance between the output end of the vibration exciter assembly and the motor. That is to say, the product of the distance between the output end of the preset acting force and the vibration exciter assembly and the motor is greater than or equal to the preset torque M, and in this embodiment, the product of the distance between the output end of the preset acting force and the vibration exciter assembly and the motor is equal to the preset torque M, so that the acting force can accurately and truly reflect the load condition borne by the motor housing 1 under the actual working condition.
S4, installing the motor shell 1 into the test assembly.
That is, the two ends of the motor housing 1 are respectively connected to the motor small-head hoisting plate 11 and the motor large-head hoisting plate 12, and the excitation loading rod 13 is abutted against the motor small-head hoisting plate 11. Specifically, both ends of the motor housing 1 are connected to the motor small-end hoisting plate 11 and the motor large-end hoisting plate 12 through the connecting bolts 16, so that the motor housing 1 can be conveniently disassembled and assembled.
And S5, applying a load to the motor small-end hoisting plate 11 or the motor large-end hoisting plate 12 by using the vibration exciter assembly, and continuously increasing the load until the value detected by the strain detection assembly reaches K.T, wherein K is a safety coefficient.
That is, the vibration exciter 14 applies a load to the motor small end hoisting plate 11 or the motor large end hoisting plate 12 through the vibration exciting loading rod 13, and continuously increases the load until the value detected by the strain detection assembly reaches K · T, where K is a safety coefficient. Specifically, the exciter 14 applies a load to the motor small-head hoisting plate 11 through the exciting loading rod 13.
S6, carrying out vibration fatigue test by using the vibration exciter assembly, wherein if the vibration fatigue cycle number of the motor shell 1 is lower than 1 multiplied by 107Secondly, judging that the fatigue life of the motor shell 1 is unqualified; if the number of vibration fatigue cycles of the motor case 1 is higher than or equal to 1 × 107Next, the fatigue life of the motor housing 1 is determined to be acceptable.
That is, the vibration fatigue test is performed on the motor housing 1 by continuously applying a load to the exciter assembly, and if the number of vibration fatigue cycles of the motor housing 1 is less than 1 × 10 during the test7Secondly, judging that the fatigue life of the motor shell 1 is unqualified; if the number of vibration fatigue cycles of the motor case 1 is higher than or equal to 1 × 107Next, the fatigue life of the motor housing 1 is determined to be acceptable.
The vibration fatigue test performed by the exciter assembly is classified into two types, one is a pass test, and the other is a destructive test in which a load is continuously increased. Wherein, the value range of the safety coefficient K in the passing test is more than or equal to 1.6 and less than or equal to 1.8. Specifically, when K < 1.6, if the vibration fatigue cycle number of the motor case 1 is less than 1 × 107Secondly, judging that the fatigue life of the motor shell 1 is unqualified; when K is more than or equal to 1.6 and less than or equal to 1.8, if the vibration fatigue cycle number of the motor shell 1 is less than 1 x 107Then, the fatigue life of the motor housing 1 is determined to be defective, and if the vibration fatigue cycle number of the motor housing 1 is higher than 1 × 107Secondly, judging that the fatigue life of the motor shell 1 is qualified; when K > 1.8, if the vibration fatigue cycle number of the motor case 1 is more than 1X 107Secondly, judging that the fatigue life of the motor shell 1 is qualified, but the motor shell 1 has design redundancy, recommending a designer of the motor shell 1 to change the structure of the motor shell 1, eliminating the design redundancy and saving costThe method is as follows.
The motor shell vibration fatigue test method not only can independently test the motor shell, has strong pertinence and higher test efficiency, but also can apply load close to the actual working condition of the motor to the motor shell in a calibration mode, so that the load in the vibration fatigue test is close to the actual working condition, and the test accuracy is improved; in addition, the method for testing the vibration fatigue of the motor shell can also find the design redundancy of the motor shell 1, saves the cost, is favorable for reducing the weight of the motor and is favorable for the lightweight design of the motor.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
It is noted that throughout the description herein, references to the description of "some embodiments," "other embodiments," or the like, are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Claims (15)
1. A motor casing vibration fatigue test device characterized by comprising:
the calibration assembly comprises three baffles, a screw (3), a nut and a force loading display (2), the three baffles are slidably arranged on the screw (3) in a penetrating manner and are arranged at intervals, the force loading display (2) can be clamped between a first baffle (41) and a second baffle (42), a motor shell (1) can be clamped between the second baffle (42) and a third baffle (43), and the nut can be screwed on the screw (3) to enable the force loading display (2) to be clamped between the first baffle (41) and the second baffle (42) and enable the motor shell (1) to be clamped between the second baffle (42) and the third baffle (43);
the testing assembly comprises a small motor head hoisting plate (11), a large motor head hoisting plate (12), a vibration exciter assembly and a hoisting frame (9), wherein the small motor head hoisting plate (11) and the large motor head hoisting plate (12) are connected to the hoisting frame (9) through hoisting steel wires (10), two ends of the motor shell (1) are respectively connected to the small motor head hoisting plate (11) and the large motor head hoisting plate (12), and the output end of the vibration exciter assembly is used for applying load to the small motor head hoisting plate (11) or the large motor head hoisting plate (12);
the strain detection assembly is used for detecting the strain of a preset part of the motor shell (1).
2. The motor shell vibration fatigue test device according to claim 1, wherein the strain detection assembly comprises a strain gauge (7) and a strain gauge (5), the strain gauge (7) and the strain gauge (5) are electrically connected, and the strain gauge (5) is attached to the surface of a preset part of the motor shell (1).
3. The motor shell vibration fatigue testing device according to claim 1, wherein the vibration exciter assembly comprises a vibration exciter (14) and a vibration exciting loading rod (13), the vibration exciting loading rod (13) is connected to an output end of the vibration exciter (14), and the vibration exciting loading rod (13) is used for applying a load to the motor small-end hoisting plate (11) or the motor large-end hoisting plate (12).
4. The motor casing vibration fatigue testing apparatus of claim 3, wherein the exciter assembly further comprises a control element (15), the control element (15) being electrically connected to the exciter (14), the control element (15) being configured to control an output load of the exciter (14).
5. The motor casing vibration fatigue test device according to claim 3, wherein a center line of the excitation loading rod (13) is arranged in parallel with and at a distance from a center line of the motor casing (1).
6. The vibration fatigue test device for the motor shell according to claim 1, wherein bolt connection holes are formed in the motor small-head hoisting plate (11) and the motor large-head hoisting plate (12), and two ends of the motor shell (1) are respectively connected to the motor small-head hoisting plate (11) and the motor large-head hoisting plate (12) through connection bolts (16).
7. The motor casing vibration fatigue test device of claim 1, wherein one of the motor small-end hanging plate (11) and the motor large-end hanging plate (12) in transmission connection with the output end of the exciter assembly has a length greater than the other.
8. A vibration fatigue test method for a motor housing, characterized by performing a vibration fatigue test using the vibration fatigue test apparatus for a motor housing according to any one of claims 1 to 7, the vibration fatigue test method for a motor housing comprising the steps of:
s1, determining a preset part for detecting a strain detection assembly, and connecting the strain detection assembly to the preset part;
s2, installing the motor shell (1) into the calibration assembly;
s3, applying acting force to the force loading display (2) and the motor shell (1), enabling the acting force loaded by the force loading display (2) to reach a preset acting force, and recording a detection value T of the strain detection assembly;
s4, mounting the motor shell (1) into a test assembly;
s5, applying a load to the motor small-end hoisting plate (11) or the motor large-end hoisting plate (12) by using a vibration exciter assembly, and continuously increasing the load until the value detected by the strain detection assembly reaches K.T, wherein K is a safety coefficient;
s6, carrying out a vibration fatigue test by using the vibration exciter assembly, wherein if the vibration fatigue cycle number of the motor shell (1) is lower than 1 multiplied by 107Secondly, judging that the fatigue life of the motor shell (1) is unqualified; if the number of vibration fatigue cycles of the motor case (1) is higher than or equal to 1 x 107And judging that the fatigue life of the motor shell (1) is qualified.
9. The motor housing vibration fatigue testing method according to claim 8, wherein if the number of vibration fatigue cycles of the motor housing (1) is less than 1 x 10 when K < 1.67Secondly, judging that the fatigue life of the motor shell (1) is unqualified; when K is more than or equal to 1.6 and less than or equal to 1.8, if the vibration fatigue cycle number of the motor shell (1) is less than 1 x 107Judging that the fatigue life of the motor shell (1) is not qualified, and if the vibration fatigue cycle number of the motor shell (1) is higher than 1 multiplied by 107Secondly, judging that the fatigue life of the motor shell (1) is qualified; when K is more than 1.8, if the vibration fatigue cycle number of the motor shell (1) is more than 1 multiplied by 107And secondly, judging that the fatigue life of the motor shell (1) is qualified, and designing redundancy exists in the motor shell (1).
10. The motor housing vibration fatigue testing method according to claim 8, wherein in step S1, a maximum portion of the motor housing (1) where strain occurs is analyzed by a computer aided engineering, and the maximum portion is used as the predetermined portion for detection by the strain detection unit.
11. The motor housing vibration fatigue testing method according to claim 10, wherein a preset torque M is applied to the motor housing (1) when the motor housing (1) is subjected to strain analysis by computer aided engineering, and the preset torque M is obtained by computer aided engineering analysis and road spectrum working conditions.
12. The motor casing vibration fatigue testing method of claim 11, wherein the predetermined applied force is greater than or equal to a ratio of the predetermined torque M to a spacing between an output end of the exciter assembly and the motor.
13. The motor housing vibration fatigue test method according to claim 8, wherein in step S2, the force application indicator (2) is sandwiched between a first baffle (41) and a second baffle (42), the motor housing (1) is sandwiched between the second baffle (42) and a third baffle (43), and the clamping of the force application indicator (2) and the motor housing (1) is achieved by screwing a nut onto a screw (3).
14. The motor casing vibration fatigue test method according to claim 8, wherein in step S3, the force application display (2) and the motor casing (1) are applied by screwing the nut on the screw (3) and the force is adjusted.
15. The motor casing vibration fatigue test method according to claim 8, wherein in step S4, both ends of the motor casing (1) are connected to a motor small end hoisting plate (11) and a motor large end hoisting plate (12), respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111483299.7A CN114199487A (en) | 2021-12-07 | 2021-12-07 | Motor shell vibration fatigue test device and test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111483299.7A CN114199487A (en) | 2021-12-07 | 2021-12-07 | Motor shell vibration fatigue test device and test method |
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| CN114199487A true CN114199487A (en) | 2022-03-18 |
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