CN113251912A - Motor rotor lamination strain testing device - Google Patents
Motor rotor lamination strain testing device Download PDFInfo
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- CN113251912A CN113251912A CN202110354115.0A CN202110354115A CN113251912A CN 113251912 A CN113251912 A CN 113251912A CN 202110354115 A CN202110354115 A CN 202110354115A CN 113251912 A CN113251912 A CN 113251912A
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- lamination
- fixing device
- strain
- fixing
- strain testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
Abstract
The invention relates to a motor rotor lamination strain testing device which is composed of a lamination fixing device I, a driving shaft fixing device, a bottom plate, a driving device, a lamination fixing device II, a transmission device and a strain testing device and is simple in structure. The invention obtains the strain of the position of interest on the lamination through the way of strain test, easy to operate, the fixing device of the lamination strain test device has 2-order adjusting function in the radial direction, the adjusting range is wide, can meet the test requirement of the lamination with different inner diameters; the lamination fixing device adopts high-pressure airflow to realize reliable attachment of the lamination and the fixing device, so that the lamination is prevented from buckling when rotating at high speed; the lamination stress testing device is arranged in the lamination fixing device, so that the problem of data transmission of a high-speed rotating body is effectively solved; the transmission device has a large transmission ratio, and can realize strain test under the working condition of ultrahigh rotating speed; the method effectively changes the current situation that the stress strain of the rotor lamination can only be obtained by a finite element analysis method.
Description
Technical Field
The invention belongs to the technical field of strain testing, particularly relates to a bench test device, and particularly relates to a motor rotor lamination strain testing device.
Background
The motor is often required to output power to the outside at a high rotation speed as a power source. With the development of high-speed motors, the working rotating speed of the rotor is frequently changed, and the centrifugal force load borne by the rotor lamination is larger and larger. The rotor lamination is an important component of the motor rotor and plays the roles of supporting the magnetic steel and transmitting magnetic force. Because the rotor lamination needs to reserve space for the magnetic steel and has certain de-weighting requirements, the internal structure of the lamination has a plurality of fillets. The fillets can generate large stress strain under the action of centrifugal force load, when the load is large to a certain degree, the rotor lamination can be subjected to plastic deformation or fracture failure, the performance of the motor is influenced slightly, and the motor is damaged seriously to cause accidents. It can be seen that the limit speed that the rotor laminations can withstand is important to the product.
The prior art discloses a turbo generator set bearing load recognition device based on pivot strain signal, including strain measuring device, strain signal transmission device and central processing unit, strain measuring device and strain signal transmission device are used for setting up respectively between per two bearings on pivot surface, and strain measuring device's signal output part passes through strain signal transmission device and is connected with central processing unit's signal input part. The stress distribution condition of the rotating shaft is known by testing strain signals at different sections of the rotating shaft, the bearing load is identified, the dangerous section is analyzed, the working state of each bearing in the actual operation process of the turbo generator set can be analyzed according to the identified bearing load, the fault reasons of high bearing bush temperature, bearing grinding, bearing breaking, instability, large vibration and the like are further judged, and the shafting centering condition can be further analyzed on the basis.
The prior art also discloses a stress measuring device for use in a rotating situation, comprising the steps of: 1. acquiring the rotating speed of a workpiece to be detected in a working state; 2. selecting a data processing device according to the rotation speed to be detected, installing a stress sheet, a power supply and the data processing device on a workpiece to be detected, selecting a storage device as the data processing device if the working state of the workpiece to be detected is a rotation state exceeding 30rpm, and selecting a communication device as the data processing device if the working state of the workpiece to be detected is a rotation state not exceeding 30 rpm; 3. starting the data processing device; 4. controlling the workpiece to rotate at a plurality of rotating speed values, and acquiring the relation between the rotating speed and the stress of the workpiece at the current angle; 5. adjusting the inclination angle of the workpiece for a plurality of times, wherein the angle is adjusted once every time 4 times; 6. and (3) applying data collected by machine learning tools Tensorflow training 4 and 5 to establish a relation model of speed and stress at each angle. The invention can test the stress condition under the rotation condition.
The prior art also discloses a camshaft dynamic stress testing device, which comprises a supplementary small hole processed on the camshaft; a strain gauge is pasted on a stress-concerned part on the camshaft, one end of a lead is connected with the strain gauge through a supplementary small hole, a hollow oil duct of the camshaft and a connecting disc, and the other end of the lead is connected with a wireless transmitting module; the camshaft is arranged on the gas distribution test bed; carrying out state calibration, temperature compensation, strain gauge debugging and preloading of the strain gauge; the test bed runs, the high-speed rotating camshaft bears periodic load, and the strain gauge generates a strain signal due to local deformation; the strain signal is transmitted and transmitted through the lead and the transmitting module; the wireless signal received by the wireless receiving module is stored and data converted by a computer, and finally, a periodic stress curve of the concerned part is obtained. The camshaft dynamic stress testing device provided by the invention can obtain the periodic stress value, the data is real and reliable, and compared with wired testing, the field management and the testing process are simpler.
At present, the strength and durability of the rotor lamination can only depend on finite element analysis, and the lamination strain testing device is still blank.
Disclosure of Invention
The invention aims to provide a motor rotor lamination strain testing device, which obtains the strain of laminations in a rotating state in a strain testing mode so as to solve the problems of fixation of laminations with different inner diameters, high-speed rotation of the laminations, easy buckling and strain testing in the rotating state of the laminations.
The purpose of the invention is realized by the following technical scheme:
a motor rotor lamination strain testing device is composed of a lamination fixing device I1, a driving shaft fixing device 2, a bottom plate 3, a driving device 4, a lamination fixing device II 5, a transmission device 6 and a strain testing device 7;
the lamination fixing device II 5, the driving shaft fixing device 2 and the driving device 4 are all fixed on the bottom plate 3; the lamination fixing device I1 is arranged between the lamination fixing device II 5 and the driving shaft fixing device 2, and the driving shaft penetrates through the driving shaft fixing device 2 to be matched with the lamination fixing device I1; the large end of the transmission device 6 is sleeved on a driving shaft of the driving device 4, the small end of the transmission device is sleeved on the transmission shaft, and the driving device 4 drives the lamination fixing device 1 to rotate through the transmission device 6; the strain testing device 7 is arranged in the lamination fixing device 1;
the lamination fixing device I1 mainly comprises a cylinder sleeve 101, a plurality of lamination fixing claws 102, a plurality of T-shaped blocks 103, a cover plate 104 and a lamination fixing device body 106; the cylinder sleeve 101 is arranged on the inner side of a central hole of the fixing device body 106, and the cylinder sleeve 101 is used for connecting the lamination fixing device I1 and the transmission shaft; the lamination fixing claws 102 are connected with the T-shaped blocks 103, are arranged at the top of the fixing device body 106 and are used for radial 2-step adjustment and fixation of rotor laminations, the laminations can be sleeved into the lamination fixing claws 102 and attached to the lamination fixing device I1, and the lamination fixing claws 102 are tightly attached to the inner diameter of the laminations by adjusting the T-shaped blocks 103; the cover plate 104 is fixed at the bottom of the fixing device body 106 and forms a chamber with the lamination fixing device body 106 for placing the strain testing device 7;
the lamination fixing device II 5 is provided with a plurality of air holes 501 for axially fixing the laminations and an air nozzle 502 for connecting high-pressure air into the lamination fixing device II 5.
Further, the lamination fixing device II 5 and the driving shaft fixing device 2 are fixed on the top of one side of the bottom plate 3 through bolts, and the driving device 4 is fixed at the opposite angle of the other side of the bottom plate 3 through bolts.
Further, the cylinder sleeve 101 is fixed to the lamination fixing device body 106 by a plurality of bolts.
Further, the plurality of T-shaped blocks 103 are fixed with the lamination fixing device body 106 through adjusting bolts I107, and the radial positions of the T-shaped blocks in the lamination fixing device I1 can be adjusted to adapt to rotor laminations with different shaft diameters.
Furthermore, the lamination fixing claws 102 are fixed on the upper parts of the corresponding T-shaped blocks 103 through adjusting bolts II 108 and can be fixed at two positions along the T-shaped blocks 103 to adapt to rotor laminations with different shaft diameters, the arc areas at the front ends of the lamination fixing claws 102 are used for fixing shaft holes of the rotor laminations, so that the axes of the laminations are coaxial with the axis of the cylinder sleeve 101, and driving force is applied to the rotor laminations through friction force.
Further, the lamination fixing claws 102 and the T-shaped blocks 103 are 6 in number.
Further, a through hole 105 is left at the top of the fixing device body 106 for a signal line of the strain testing device 7 to pass through.
Further, the cover plate 104 is a circular ring shape, and 6 holes are formed in the circular ring shape, and the cover plate 104 is fixed to the fixing device body 106 by 6 bolts.
Further, the strain testing device 7 is fixed in a chamber formed by the cover plate 104 and the fixing device body 106, and is composed of a power supply device 701, a data processing device 702, a data storage device 703, a data interface 704, a counterweight block i 705 and a counterweight block ii 706, wherein the power supply device 701 is used for providing a power supply for the strain testing device 7, the data processing device 702 is used for filtering and amplifying signals obtained by a strain bridge test, the data storage device 703 is used for storing test data, and the data interface 704 is used for an external device to read the test data stored in the data storage device 703.
Further, a plurality of gas pockets 501 are seted up on lamination fixing device II 5 front side wall, and a plurality of gas pockets 501 are at circumferencial direction evenly distributed, make even outside discharge of high-pressure gas, play lamination axial fixity's effect, and air cock 502 sets up in lamination fixing device II 5 left side wall upper end.
Compared with the prior art, the invention has the beneficial effects that:
the device obtains the strain of the concerned position on the lamination through the strain test mode, has simple structure and easy operation, and the fixing device of the lamination strain test device has 2-order adjusting function in the radial direction, has wide adjusting range and can meet the test requirements of the laminations with different inner diameters; the lamination fixing device adopts high-pressure airflow to realize reliable attachment of the lamination and the fixing device, prevents the lamination from buckling during high-speed rotation, and realizes non-contact axial fixation of the lamination; the lamination stress testing device is arranged in the lamination fixing device, so that the problem of data transmission of a high-speed rotating body is effectively solved; the transmission device has a large transmission ratio, and can realize strain test under the working condition of ultrahigh rotating speed; the method effectively changes the current situation that the stress strain of the rotor lamination can only be obtained by a finite element analysis method.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a device for testing the lamination strain of a motor rotor;
FIG. 2 is a schematic front view of the lamination retainer;
FIG. 3 is a schematic view of the reverse construction of the lamination fixture;
FIG. 4 is a schematic view of the lamination fixture with the cover plate removed from the back;
FIG. 5 is a schematic structural diagram of a strain gauge;
FIG. 6 is a schematic view of a lamination fixture;
FIG. 7 is a schematic view of the T-block being coupled to the lamination retainer body;
fig. 8 is a schematic view of the lamination holding claws being connected to the T-shaped block.
In the figure, 1, a lamination fixing device I2, a driving shaft fixing device 3, a bottom plate 4, a driving device 5, a lamination fixing device II 6, a transmission device 7, a strain testing device 101, a cylinder sleeve 102, a lamination fixing claw 103, a T-shaped block 104, a cover plate 105, a through hole 106, a lamination fixing device body 107, an adjusting bolt I108, an adjusting bolt II 501, an air hole 502, an air nozzle 701, a power supply device 702, a data processing device 703, a data storage device 704, a data interface 705, a balancing weight I706 and a balancing weight II.
Detailed Description
The invention is further illustrated by the following examples:
the present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
As shown in figure 1, the motor rotor lamination strain testing device comprises a lamination fixing device I1, a driving shaft fixing device 2, a bottom plate 3, a driving device 4, a lamination fixing device II 5, a transmission device 6 and a strain testing device 7.
The lamination fixing device II 5 and the driving shaft fixing device 2 are fixed at the top of one side of the bottom plate 3 through bolts, and the driving device 4 is fixed at the opposite angle of the other side of the bottom plate 3 through bolts. Lamination fixing device I1 sets up between lamination fixing device II 5 and drive shaft fixing device 2, and the transmission shaft passes drive shaft fixing device 2 and cooperates with lamination fixing device I1. The drive shaft fixing device 2 is used to support a drive shaft. The large end of the transmission device 6 is sleeved on a driving shaft of the driving device 4, the small end of the transmission device is sleeved on the transmission shaft, and the driving device 4 drives the lamination fixing device 1 to rotate through the transmission device 6. The strain gauge 7 is mounted in the lamination fixture 1 and is not visible in fig. 1.
As shown in fig. 2 to 4, the lamination fixing device i 1 mainly comprises a cylinder sleeve 101, a plurality of lamination fixing claws 102, a plurality of T-shaped blocks 103, a cover plate 104 and a lamination fixing device body 106. The lamination fixing claws 102 and the T-shaped blocks 103 are arranged at the top of the fixing device body 106 and used for radially fixing the rotor laminations. The cylinder sleeve 101 is fixed on the inner side of a central hole of the fixing device body 106 through a bolt, and the cylinder sleeve 101 is used for connecting the lamination fixing device I1 and the transmission shaft.
The lamination can be nested in the lamination fixing claw 102 and is jointed with the lamination fixing device I1, and the lamination fixing claw 102 can be tightly jointed with the inner diameter of the lamination by adjusting the T-shaped block 103.
As shown in fig. 7-8, the plurality of T-blocks 103 are fixed to the lamination fixture body 106 by adjusting bolts i 107, which are adjustable in radial position of the lamination fixture i 1 to accommodate rotor laminations of different shaft diameters. The lamination fixing claws 102 are fixed on the upper portions of the corresponding T-shaped blocks 103 through adjusting bolts II 108 and can be fixed at two positions along the T-shaped blocks 103 to adapt to rotor laminations with different shaft diameters, the arc areas at the front ends of the lamination fixing claws 102 are used for fixing shaft holes of the rotor laminations, the axes of the laminations are coaxial with the axis of the cylinder sleeve 101, and driving force is applied to the rotor laminations through friction force.
A via hole 105 is reserved at the top of the fixing device body 106 and is used for a signal wire of the strain testing device 7 to pass through. The cover plate 104 is disposed at the bottom of the fixing device body 106, and forms a chamber with the lamination fixing device body 106 for placing the strain testing device 7, the cover plate 104 is circular, 6 holes are formed in the cover plate 104, and the cover plate 104 is fixed with the fixing device body 106 through 6 bolts.
In one embodiment of the present invention, the lamination fixing claws 102 and the T-shaped blocks 103 are each 6.
As shown in fig. 5, the strain testing device 7 is composed of a power supply device 701, a data processing device 702, a data storage device 703, a data interface 704, a weight block i 705 and a weight block ii 706, wherein the power supply device 701, the data processing device 702, the data storage device 703, the data interface 704, the weight block i 705 and the weight block ii 706 are arranged at intervals and fixed in a chamber formed by the cover plate 104 and the fixing device body 106. The power supply device 701 is used for providing a power supply for the strain testing device 7, the data processing device 702 is used for filtering and amplifying signals obtained by a strain bridge test, the data storage device 703 is used for storing test data, and the data interface 704 is used for reading the test data stored in the data storage device 703 by external equipment. When the lamination fixing device I1 rotates, if the center of mass is not on the axis, vibration can occur, and by adding the two configuration blocks, the whole device can be on the main axis through dynamic balance, so that the device is suitable for high-speed rotation.
As shown in fig. 6, a plurality of air holes 501 are formed in the front side wall of the lamination fixing device ii 5, and the plurality of air holes 501 are uniformly distributed in the circumferential direction, so that high-pressure air is uniformly discharged to the outside, and the axial fixing function of the lamination is achieved; and the upper end of the left side wall of the lamination fixing device II 5 is provided with an air tap 502, and the air tap 502 is connected with a high-pressure gas pipeline arranged on the lamination fixing device II 5 and is used for connecting high-pressure gas into the lamination fixing device II 5.
A method for testing the lamination strain of a motor rotor comprises the following steps:
A. sticking a strain gauge at the key position of the lamination, and adjusting the lamination fixing claw 102 and the T-shaped block 103 to adapt to the inner diameter of the lamination;
B. sleeving the lamination into the lamination fixing claw 102 to enable the lamination to be attached to the lamination fixing device I1;
C. adjusting the T-shaped block 103 to enable the lamination fixing claw 102 to be tightly attached to the inner diameter of the lamination;
D. the data line of the strain test device 7 is welded on the strain gauge through the through hole 105 and fixed;
E. opening the lamination fixing device II 5, allowing high-pressure gas to enter an air cavity of the lamination fixing device II 5 from the air nozzle 502, and blowing the high-pressure gas to the lamination through air holes 501 uniformly distributed on the lamination fixing device II 5 so as to enable the lamination to be tightly attached to the fixing device 1;
F. starting a driving device 4, driving the lamination fixing device 1 to rotate through a transmission device 6, and adjusting the rotating speed of the driving device 4 according to requirements;
G. the strain measuring device 7 transmits and processes the strain signal from the strain bridge and stores the signal in the data storage device 703.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The utility model provides an electric motor rotor lamination strain test device, includes bottom plate (3), its characterized in that: a lamination fixing device II (5), a driving shaft fixing device (2) and a driving device (4) are fixed on the bottom plate (3); a lamination fixing device I (1) is arranged between the lamination fixing device II (5) and the driving shaft fixing device (2), and the transmission shaft penetrates through the driving shaft fixing device (2) to be matched with the lamination fixing device I (1); the lamination testing device is characterized by further comprising a transmission device (6) and a strain testing device (7) arranged in the lamination fixing device (1), wherein the large end of the transmission device (6) is sleeved on a driving shaft of the driving device (4), the small end of the transmission device is sleeved on the transmission shaft, and the driving device (4) drives the lamination fixing device (1) to rotate through the transmission device (6);
the lamination fixing device I (1) mainly comprises a cylinder sleeve (101), a plurality of lamination fixing claws (102), a plurality of T-shaped blocks (103), a cover plate (104) and a lamination fixing device body (106); the cylinder sleeve (101) is arranged on the inner side of a central hole of the fixing device body (106), the cylinder sleeve (101) is used for connecting the lamination fixing device I (1) with a transmission shaft, the lamination fixing claws (102) are connected with the corresponding T-shaped blocks (103) and arranged at the top of the fixing device body (106) and used for radial 2-step adjustment and fixation of rotor laminations, the laminations can be sleeved into the lamination fixing claws (102) to be attached to the lamination fixing device I (1), the lamination fixing claws (102) are tightly attached to the inner diameter of the laminations by adjusting the T-shaped blocks (103), the cover plate (104) is fixed to the bottom of the fixing device body (106) and forms a chamber with the lamination fixing device body (106) for placing the strain testing device (7);
the lamination fixing device II (5) is provided with a plurality of air holes (501) for axially fixing the laminations and an air nozzle (502) for connecting high-pressure air into the lamination fixing device II (5).
2. The electric machine rotor lamination strain testing device of claim 1, wherein: the lamination fixing device II (5) and the driving shaft fixing device (2) are fixed at the top of one side of the bottom plate (3) through bolts, and the driving device (4) is fixed at the opposite angle of the other side of the bottom plate (3) through bolts.
3. The electric machine rotor lamination strain testing device of claim 1, wherein: the cylinder sleeve (101) is fixed with the lamination fixing device body (106) through a plurality of bolts.
4. The electric machine rotor lamination strain testing device of claim 1, wherein: the T-shaped blocks (103) are fixed with the lamination fixing device body (106) through adjusting bolts I (107), and the radial positions of the T-shaped blocks in the lamination fixing device I (1) can be adjusted to adapt to rotor laminations with different shaft diameters.
5. The electric machine rotor lamination strain testing device of claim 4, wherein: the lamination fixing claw (102) is fixed on the upper portion of the corresponding T-shaped block (103) through an adjusting bolt II (108), the lamination fixing claw can be fixed at two positions along the T-shaped block (103) to adapt to rotor laminations with different shaft diameters, the arc area of the front end of the lamination fixing claw (102) is used for fixing a rotor lamination shaft hole, the axis of the lamination is coaxial with the axis of the cylinder sleeve (101), and driving force is applied to the rotor laminations through friction force.
6. The electric machine rotor lamination strain testing device of claim 1, wherein: the lamination fixing claws (102) and the T-shaped blocks (103) are respectively 6.
7. The electric machine rotor lamination strain testing device of claim 1, wherein: and a through hole (105) is reserved at the top of the fixing device body (106) and is used for a signal wire of the strain testing device (7) to pass through.
8. The electric machine rotor lamination strain testing device of claim 1, wherein: the cover plate (104) is in a ring shape, 6 holes are formed in the cover plate, and the cover plate (104) is fixed with the fixing device body (106) through 6 bolts.
9. The electric machine rotor lamination strain testing device of claim 1, wherein: the strain testing device (7) is fixed in a cavity formed by the cover plate (104) and the fixing device body (106) and comprises a power supply device (701), a data processing device (702), a data storage device (703), a data interface (704), a balancing weight I (705) and a balancing weight II (706), wherein the power supply device (701) is used for providing a power supply for the strain testing device (7), the data processing device (702) is used for filtering and amplifying signals obtained by a strain bridge test, the data storage device (703) is used for storing test data, and the data interface (704) is used for reading the test data stored in the external equipment (703).
10. The electric machine rotor lamination strain testing device of claim 1, wherein: a plurality of gas pockets (501) are seted up on lamination fixing device II (5) preceding lateral wall, and a plurality of gas pockets (501) are at circumferencial direction evenly distributed, make even outside discharge of high-pressure gas, play lamination axial fixity's effect, and air cock (502) set up in lamination fixing device II (5) left side wall upper end.
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| CN202110354115.0A CN113251912B (en) | 2021-04-01 | 2021-04-01 | Motor rotor lamination strain testing device |
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| CN202110354115.0A CN113251912B (en) | 2021-04-01 | 2021-04-01 | Motor rotor lamination strain testing device |
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