CN213688855U - Vibration test device for low-vibration motor under load working condition - Google Patents
Vibration test device for low-vibration motor under load working condition Download PDFInfo
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- CN213688855U CN213688855U CN202022808248.4U CN202022808248U CN213688855U CN 213688855 U CN213688855 U CN 213688855U CN 202022808248 U CN202022808248 U CN 202022808248U CN 213688855 U CN213688855 U CN 213688855U
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Abstract
The utility model discloses a vibration test device of a low-vibration motor under the working condition of load, which comprises a magnetic rotor, a vortex cylinder and a connecting bracket; the magnetic rotor comprises a magnetic base and a plurality of magnetic steels, the number of the magnetic steels is even, the circumferential N poles/S poles of the magnetic steels are alternately arranged on the cylindrical surface of the magnetic base, the eddy current cylinder is matched with the magnetic rotor, and the magnetic steels are close to the eddy current cylinder; the vortex cylinder is connected with the connecting bracket. The utility model provides a vibration test device under low vibration motor area load operating mode does not have other mechanical rotating spare part except that close installation integrative magnetic rotor on electric motor rotor and the output shaft, or relies on rotary part to drive the fluid of acting, need not consider the vibration influence that other mechanical rotating spare or fluid excitation conduction come when area load is surveyed and is shaken.
Description
Technical Field
The utility model belongs to the technical field of motor vibration test technique and specifically relates to a vibration test device under low vibration motor area load operating mode is related to.
Background
The motor is an electric machine which converts electric energy input from a power supply into mechanical energy of an output shaft to drive a load to rotate to do work, and is a power source of most of the existing machines. Mechanical equipment is generally required to be capable of operating reliably for a long time, and therefore, a motor for driving is also required to operate stably with low vibration noise. The low-vibration frequency-range self-noise-reducing motor is particularly used in special equipment, such as cruise ships, sonar detection ships, submarines and the like, has particularly low requirements on self noise, is lower by more than one order of magnitude compared with a conventional civil motor, and has wider requirements on low-vibration frequency spectrum range. In addition to the mechanical device as a load, which needs to be designed and manufactured to the lowest possible extent, the motor as a drive device must also vibrate to the same low extent, since the load and the motor are an integral part, such as a pump, a fan, a compressor, etc. Therefore, after the motor is manufactured, a vibration test is performed to determine whether the vibration value reaches a standard. The GB10068 standard specifies vibration measurements, assessments and limits of rotating electrical machines, the vibration test condition of the machine of the standard being the machine is mounted and operated independently, i.e. in an unloaded state.
Because the motor is a driving machine, when the single motor runs, only the motor is in an idle state, no power is output to a load, and the vibration value tested at the moment is also an idle value. However, when the motor is subjected to load torque, the electromagnetic force is increased, the relative rotation angle of the stator and the rotor is increased, the force applied to the motor shaft is also increased, and the vibration value of the motor is increased. Practice also shows that the vibration under the condition of no load of the motor is obviously different from the vibration under the condition of load, and the vibration is represented by a vibration magnitude and a vibration characteristic peak frequency. After the integrated machine is integrated with a load machine, if the vibration of the whole machine exceeds the standard, the judgment that the load machine or the motor has a problem is difficult, and the targeted improvement is difficult. Because the loading machine can be tested only by driving the prime mover to rotate, the vibration cannot be independently tested. The motor can be independently electrified to carry out rotation test alone, but is not loaded. If an artificial mechanical rotation load is carried through the output shaft, such as a dynamometer and the like, the coupling is required to be connected with the load, and meanwhile, rigid connection is required to be carried out through the base in order to ensure the coaxiality with the load machine. The vibration can be transmitted through a coupling or a base and the like which are in contact with an object, the vibration can be generated when the coupling or the base rotates as a load, the coupling can generate the vibration, and the base can generate forced vibration under the excitation of a motor or a loading machine. If the vibrations exceed a predetermined value, it is difficult to determine with certainty whether the vibrations are due to a load problem, a transmission coupling or an installation coupling problem, or a problem with the electric motor itself, and it is difficult to implement targeted measures for improvement.
Chinese patent application publication No. CN111896870A, published as 2020, 11/6/entitled "Motor load working characteristic test System and method", discloses a motor load working characteristic test system and method, which comprises a force measuring device, a control force measuring device, a load device and a control device, wherein the force measuring device and the control force measuring device are respectively arranged at two sides of a tested motor and used for testing the torque forces at the upper end and the lower end of the tested motor, the load device is connected with the control force measuring device and used for providing loads for the tested motor, the control device is respectively electrically connected with the tested motor and the load device and used for controlling the start and stop of the tested motor and the magnitude of the axial force output by the load device, the test system can realize the effect of changing the load of the tested motor by changing the axial force output by the load device and can also carry out the motor load carrying characteristic test under special environmental conditions (high and low temperature, vacuum and the like), the load device is controlled to output axial force through continuous adjustment, the load of the tested motor can be continuously changed, different load performance tests of the tested motor are completed, and continuous tests of the load characteristics of the tested motor can be realized. The above-described problems still exist with this test system.
Disclosure of Invention
The utility model discloses an in overcoming motor load test among the prior art, load mechanical vibration all can conduct through contact objects such as shaft coupling and base, also can produce the problem that vibration influences the accuracy of motor vibration test when rotatory as the load, a vibration test device under low vibration motor area load operating mode is provided, except that close installation integrative magnetic rotor on electric rotor and the output shaft, there are not other mechanical rotation spare part, or rely on rotary part to drive the fluid of acting, need not consider the vibration influence that other mechanical rotation spare or fluid excitation conduction come when area load is surveyed and is shaken.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low vibration motor loaded vibration test device comprises a magnetic rotor, a vortex tube and a connecting bracket; the magnetic rotor comprises a magnetic base and a plurality of magnetic steels, the number of the magnetic steels is even, the circumferential N poles/S poles of the magnetic steels are alternately arranged on the cylindrical surface of the magnetic base, the eddy current cylinder is matched with the magnetic rotor, and the magnetic steels are close to the eddy current cylinder; the vortex cylinder is connected with the connecting bracket.
In the technical scheme, the magnetic seat is made of a magnetic conductive material, and the magnetic steel is made of a rare earth permanent magnet material with the same mark number, such as rubidium, iron, boron and magnetic steel or samarium, cobalt and magnetic steel; the magnetic steel is adhered and fastened by using an adhesive; each piece of magnetic steel is matched with magnetic flux through size selection, so that the error is less than 1 per thousand, and the magnetic steel with the same polarity and the closest magnetic flux is arranged at the radial symmetrical position of the cylindrical surface of the magnetic base; the magnetic steel is magnetized in the radial direction, namely in the radial direction of the magnetic rotor, one of the N pole and the S pole of the magnetic steel is arranged on the inner side, and the other is arranged on the outer side. The wall of the vortex cylinder is uniform in thickness, a certain uniform gap is formed around the vortex cylinder and is away from the magnetic steel, and collision is avoided when the magnetic rotor rotates. The magnetic rotor is fixed with the output shaft of the motor, and the motor and the connecting support are positioned and fixed through a flange structure. When the test is carried out, the motor is electrified, the motor drives the magnetic rotor to rotate rapidly, the eddy current cylinder wall generates induced eddy current in the eddy current cylinder due to cutting of magnetic lines of force under the action of a magnetic field of the magnetic rotor, the eddy current generates heat in the eddy current cylinder due to the Joule's law, the output power of the motor is consumed, and the test is equivalent to a load for an output shaft of the motor. At the same time, the eddy current magnetic field interacts with the magnetic rotor magnetic field to produce a resistive torque, also relative to a load. At the moment, the vibration value of the motor under the loading condition, including the vibration frequency spectrum, can be tested by using the vibration tester. Since there is no mechanical vibration conducted by other moving parts except the motor itself and the magnetic rotor mounted and fixed on the output shaft, the measured vibration is the vibration data when the motor itself is loaded.
Preferably, the circumferential N poles/S poles of the magnetic steel are alternately arranged on the outer cylindrical surface of the magnetic base, and one end of the vortex cylinder is sleeved on the outer side of the magnetic rotor. The scheme is a specific arrangement mode of the magnetic steel.
Preferably, the magnetic rotor is provided with a mounting hole, the circumferential N pole/S pole of the magnetic steel is alternately arranged on the cylindrical surface in the mounting hole, and one end of the magnetic rotor is sleeved outside the vortex cylinder. The scheme is another specific arrangement mode of the magnetic steel.
Preferably, the vortex cylinder is fixed with the lifting end of the lifting adjusting mechanism, and the lifting adjusting mechanism is fixed with the connecting support. The lifting adjusting mechanism can be a screw rod nut mechanism, a rack and pinion machine or a hydraulic driver, and only a machine capable of realizing lifting control can be used as the lifting adjusting mechanism. The lifting adjusting mechanism adjusts the reverse acting force borne by the magnetic rotor by adjusting the axial position of the vortex cylinder, and adjusts the axial position of the metal vortex cylinder by observing the input power value of the motor, so that the load can be adjusted to the required size.
Preferably, the coupling bracket comprises a mounting seat, and the vortex tube is connected with the mounting seat in a sliding manner. The vortex tube is connected with the mounting seat in a sliding mode through the key groove structure, and the vortex tube can be prevented from rotating due to torsion.
Preferably, the coupling bracket further comprises a vibration isolator, and the mounting seat is connected with the vibration measuring base through the vibration isolator. The vibration isolator can isolate the vibration of the motor, and the motor is prevented from being rigidly connected with the vibration measuring base so as to measure the vibration of the motor.
Preferably, the swirl tube is made of a non-magnetic metal material. The vortex tube is made of non-magnetic metal materials, magnetism can be prevented from being magnetized, extra inherent magnetic attraction force is generated, and the fact that the magnetic attraction force is uneven and extra unbalanced magnetic attraction force is generated possibly due to the fact that the vortex tube is not uniform in magnetization to affect the correctness of a vibration test result is achieved.
Preferably, a cooling inner cavity is arranged in the vortex cylinder, and cooling liquid is arranged in the cooling inner cavity; the cooling inner cavity is respectively connected with the hose through a water inlet and a water outlet. The wall of the vortex cylinder takes away heat by means of cooling liquid, and the temperature is prevented from continuously rising.
The low-vibration motor on-load vibration test method adopts the low-vibration motor on-load vibration test device and comprises the following steps:
a. installation preparation: fixing the magnetic rotor on an output shaft of the motor, mounting the motor on a connecting bracket, and mounting a vibration testing instrument at the connecting position of the motor and the connecting bracket;
b. starting a motor: electrifying the motor to start;
c. load adjustment: the superposition area of the vortex cylinder and the magnetic rotor is adjusted through the lifting adjusting mechanism, and the load is adjusted;
d. vibration testing: when the position of the eddy current cylinder is adjusted, the input power measured by observing a power meter on a power line is the same as the rated input power, namely, the rated state of the motor is adjusted, and at the moment, a vibration measuring instrument can be adopted to measure the vibration of the motor;
e. and (3) completing the test: and detaching the testing device after the test is finished.
By implementing the technical scheme, the motor can be accurately subjected to the loaded vibration test, the loaded load does not have mechanical motion, and the fact that extra vibration is generated due to motion and is conducted to the tested motor to influence the authenticity of the tested vibration is avoided, so that the loaded vibration test of the motor in independent operation is realized. In the above-mentioned test scheme, utilize the magnetoelectric induction principle, pass through the magnetic rotor above it with the energy of motor shaft mechanical rotation output, the direct eddy current that turns into on the static metal vortex section of thick bamboo, the eddy current production hinders the rotatory magnetic field of magnetic rotor, forms the load, and the eddy current also produces heat energy consumption, realizes the sound conversion of energy and need not other mechanical rotating member energy consumptions. The test principle of the whole scheme is as follows: the power supply inputs electric power, the motor generates electromagnetic torque to enable the rotating shaft to rotate, the magnetic rotor rotates along with the rotating shaft, a magnetic field on the magnetic rotor rotates, induced eddy current is generated on the eddy current cylinder, the eddy current is converted into heat energy to be consumed, and cooling liquid is introduced to take away heat; meanwhile, when induced eddy current is generated on the eddy current cylinder, the eddy current generates a magnetic field, and the eddy current magnetic field and the magnetic rotor magnetic field interact to generate a resistance torque-load.
Preferably, during the vibration test, the cooling cavity of the vortex cylinder is continuously filled with cooling liquid, so that the cooling liquid takes away heat generated by the load test.
The utility model has the advantages that: (1) by adopting the electromagnetic induction principle and the Joule Lenz law, the problem that the conventional motor cannot independently test vibration under the loaded condition is solved, and a test method and a qualification judgment basis are provided for correctly evaluating the actual vibration of the motor; (2) when the vibration of the unit is larger, the detached motor is subjected to on-load vibration test independently, so that the vibration source of the unit can be searched conveniently, and the problem of targeted improvement is facilitated; (3) vibration tests and comparison under each load working condition of the motor can be carried out, vibration reasons can be analyzed conveniently, the motor can vibrate and improve the motor, and the vibration value of the motor is promoted to be lower and lower.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a cross-sectional view of a magnet rotor according to the present invention;
FIG. 3 is a schematic structural view of embodiment 3;
fig. 4 is a sectional view of the magnetic rotor in embodiment 3.
In the figure: the device comprises a magnetic rotor 1, a magnetic base 1.1, magnetic steel 1.2, a vortex tube 2, a cooling inner cavity 2.1, a water inlet 2.2, a water outlet 2.3, a connecting bracket 3, a mounting base 3.1, a vibration isolator 3.2, a lifting adjusting mechanism 4, a vibration measuring base 5, a hose 6 and a motor 7.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1:
as shown in fig. 1 and 2, a low-vibration motor loaded vibration test device comprises a magnetic rotor 1, an eddy current cylinder 2, a connecting bracket 3 and a lifting adjusting mechanism 4; the magnetic rotor 1 comprises a magnetic base 1.1 and a plurality of magnetic steels 1.2, the magnetic base 1.1 is made of a magnetic conductive material, the magnetic steels 1.2 are made of rare earth permanent magnetic materials with the same brand, and the magnetic steels 1.2 are adhered and fastened by an adhesive; each piece of magnetic steel 1.2 is matched with magnetic flux through size selection, so that the error is less than 1 per thousand, and the magnetic steel 1.2 with the same polarity and the closest magnetic flux is arranged at the radial symmetrical position of the cylindrical surface of the magnetic seat 1.1; the magnetic steel 1.2 is magnetized in the radial direction, namely in the radial direction of the magnetic rotor 1, one of the N pole and the S pole of the magnetic steel 1.2 is arranged at the inner side, and the other is arranged at the outer side; the number of the magnetic steels 1.2 is even, the circumferential N poles/S poles of the magnetic steels 1.2 are alternately arranged on the cylindrical surface of the magnetic base 1.1, the vortex cylinder 2 is matched with the magnetic rotor 1, and the magnetic steels 1.2 are close to the vortex cylinder 2; the vortex tube 2 is made of non-magnetic metal material, the wall thickness is uniform, a cooling inner cavity 2.1 is arranged in the vortex tube 2, and cooling liquid is arranged in the cooling inner cavity 2.1; the cooling inner cavity 2.1 is respectively connected with a hose 6 through a water inlet 2.2 and a water outlet 2.3. The connecting bracket 3 comprises a mounting seat 3.1 and a vibration isolator 3.2, the vortex cylinder 2 is in sliding connection with the mounting seat 3.1, and the mounting seat 3.1 is connected with the vibration measuring base 5 through the vibration isolator 3.2. The vortex cylinder 2 is fixed with the lifting end of the lifting adjusting mechanism 4, and the lifting adjusting mechanism 4 is fixed with the connecting bracket 3.
In the technical scheme. The eddy current cylinder 2 has a certain gap from the magnetic steel 1.2, so that the magnetic rotor 1 is prevented from colliding when rotating. The radial clearance between the vortex cylinder and the magnetic steel is uniform and consistent. The magnetic rotor 1 is fixed with an output shaft of the motor 7, and the motor 7 and the connecting support 3 are positioned and fixed through a flange structure. During testing, the motor 7 is electrified, the motor 7 drives the magnetic rotor 1 to rotate rapidly, induced eddy current is generated in the eddy current cylinder 2 due to cutting of magnetic lines of force under the action of a magnetic field of the magnetic rotor 1 on the wall of the eddy current cylinder 2, the eddy current generates heat in the eddy current cylinder 2 due to Joule's law, the output power of the motor is consumed, and the effect is equivalent to a load for an output shaft of the motor. At the same time, the eddy current magnetic field interacts with the magnetic field of the magnetic rotor 1 to produce a resistive torque, also relative to a load. The lifting adjusting mechanism 4 adjusts the reverse acting force borne by the magnetic rotor 1 by adjusting the axial position of the vortex cylinder 2, and adjusts the axial position of the metal vortex cylinder 2 by observing the input power value of the motor 7, so that the load can be adjusted to the required size. At the moment, the vibration value of the motor under the loading condition, including the vibration frequency spectrum, can be tested by using the vibration tester. Since there is no mechanical vibration conducted by other moving parts except the motor itself and the magnetic rotor 1 fixed to the output shaft, the measured vibration is vibration data in the case where the motor itself is loaded.
Example 2:
as shown in fig. 2, based on embodiment 1, the circumferential N poles/S poles of the magnetic steel 1.2 are alternately installed on the outer cylindrical surface of the magnetic base 1.1, and one end of the eddy current cylinder 2 is sleeved on the outer side of the magnetic rotor 1. The scheme is a specific arrangement mode of the magnetic steel 1.2.
Example 3:
as shown in fig. 3 and 4, on the basis of embodiment 1, a mounting hole is formed in the magnetic rotor 1, magnetic steel 1.2 is circumferentially and alternately mounted on a cylindrical surface in the mounting hole by N pole/S pole, and one end of the magnetic rotor 1 is sleeved on the outer side of the vortex tube 2. The scheme is another specific arrangement mode of the magnetic steel 1.2.
Example 4:
the low-vibration motor on-load vibration test method adopts the low-vibration motor on-load vibration test device and comprises the following steps:
a. installation preparation: fixing the magnetic rotor 1 on an output shaft of a motor 7, installing the motor 7 on a connecting bracket 3, and installing a vibration testing instrument at the connecting position of the motor 7 and the connecting bracket 3;
b. starting the motor 7: electrifying the motor 7 for starting;
c. load adjustment: the superposition area of the vortex cylinder 2 and the magnetic rotor 1 is adjusted through the lifting adjusting mechanism 4, and the load is adjusted;
d. vibration testing: when the position of the eddy current cylinder 2 is adjusted, the input power measured by observing a power meter on a power line is the same as the rated input power, namely, the rated state of the motor is adjusted, and at the moment, a vibration measuring instrument can be adopted to measure the vibration of the motor;
e. and (3) completing the test: and detaching the testing device after the test is finished.
By implementing the technical scheme, the loaded vibration test can be accurately and reliably carried out on the motor, the loaded load has no mechanical motion, and the influence on the authenticity of the tested vibration caused by the fact that extra vibration is generated due to the motion and is conducted to the tested motor is avoided, so that the loaded vibration test of the independent operation of the motor is realized. In the above-mentioned test scheme, utilize the magnetoelectric induction principle, pass through the magnetic rotor 1 on it with the energy of 7 pivot mechanical rotation outputs, the direct eddy current that turns into on the static metal vortex section of thick bamboo 2, the eddy current production hinders the rotatory magnetic field of magnetic rotor 1, forms the load, and the eddy current also produces heat energy consumption, realizes the conversion of sound of energy and does not need to other mechanical rotating member energy consumptions. The test principle of the whole scheme is as follows: the power supply inputs electric power, the motor 7 generates electromagnetic torque to rotate the rotating shaft, the magnetic rotor 1 rotates along with the rotating shaft, the magnetic field on the magnetic rotor 1 rotates, the eddy current cylinder 2 generates induced eddy current, the eddy current is converted into heat energy to be consumed, and cooling liquid is introduced to take away heat; meanwhile, when the eddy current drum 2 generates induced eddy current, the eddy current generates a magnetic field, and the eddy current magnetic field and the magnetic field of the magnetic rotor 1 interact to generate a resistance torque-load.
The motor requires to know the rated input power P in advanceiI.e. the input power when the motor outputs the rated power P; when the motor is not informed of the rated input power, it can be determined by calculation using the rated efficiency eta of the motor, i.e. Pi= P/η. Each magnet steel 1.2 on the magnetic rotor 1 generates a radial magnetic field, the magnetic fields adjacent to the magnet steels 1.2 are opposite in direction, N/S are alternately arranged, the eddy current cylinder 2 is static, when the magnetic rotor 1 rotates along with the rotating shaft of the motor, the eddy current cylinder 2 is positioned in an alternating magnetic field formed by the rotation of the magnetic rotor 1, and an induced electromotive force is generated on the metal eddy current cylinder 2 according to an electromagnetic induction law, wherein the induced electromotive force is e = BVl = CEφ n, the magnitude of the induced electromotive force is related to the magnetic flux and the rotation speed. The metal eddy current cylinder 2 is a self-closed cylinder conductor with uniform wall thickness, and electromotive forces generated on the metal inner cylinder by each pair of adjacent magnetic poles are opposite in direction to form closed loop current, also called eddy current. Because the wall thickness of the homogenizing cylinder is the same, and the distance from the homogenizing cylinder to the magnetic rotor 1, namely the air gap is the same, the magnitude of each group of eddy current generated on the homogenizing cylinder is also the same, and the number of magnetic poles is the same as that of the eddy current. The eddy current generated on the cylinder body of the eddy current cylinder 2 can generate a magnetic field according to the magnetic induction formula B = mu0I/2 rr, the generated magnetic field striving to prevent the magnetic field on the magnetic rotor 1 from rotating, i.e. to produce a reluctance torque MCThe resistance torque also becomes the load of the output shaft of the motor 7, the load power PC=MCN/9550. According to the rated output power of the motor 7, the size of the magnetic rotor 1 and the wall thickness and the material of the cylinder are selected, according to the ohm law, the resistance can be reduced by adopting the material with low resistivity, the resistance can also be reduced by increasing the wall thickness, so that the eddy current value is improved, namely the load is improvedAnd (4) torque. The axial position of the vortex tube 2 is adjusted by the adjusting screw, so that the magnetic flux on the tube body of the vortex tube 2 is changed, the induced electromotive force generated on the tube body is changed, the eddy current is further changed, and the corresponding resistance torque, namely the load torque is also changed. When the lifting adjusting mechanism 4 is adjusted, the measured input power is the same as the rated input power by observing the power meter on the power line, namely, the rated state of the motor is adjusted, and at the moment, the vibration measurement instrument can be used for measuring the vibration of the motor. The cylinder body has resistance, eddy current generates heat according to Joule Lenz law, and the heat productivity Q = I2Rt = eIt, and is proportional to the square of the eddy current and the resistance, that is, the magnitude of the induced electromotive force and the magnitude of the current. The heat is generated to consume energy, the cooling water flows through the surface of the inner barrel through the hose 6 to be cooled, the heat is taken away, and the temperature is prevented from continuously rising.
The utility model has the advantages that: (1) except the magnetic rotors which are tightly installed into a whole on the motor rotor and the output shaft, other mechanical rotating parts or fluid which drives a rotating part to do work are not needed, and the vibration influence caused by vibration excitation of other mechanical rotating parts or fluid is not needed to be considered when the vibration is measured with load; (2) the eddy current cylinder serving as a load can keep concentricity with the magnetic rotor on a mounting structure through structural design and arrangement, and the magnetic characteristics are ensured to be symmetrically and uniformly distributed through a matching method, so that the polarization force caused by the magnetic characteristics is avoided; (3) the load size can be conveniently adjusted to the load amount to be tested; (4) aiming at different motor powers, the required eddy current heating power can be obtained by changing the magnetic performance of the magnetic steel of the magnetic rotor, the diameter or the length of the rotor, the wall thickness of the eddy current cylinder and the material, so that the requirements of loaded independent vibration tests of motors with different powers are met; (5) the motor independent on-load vibration test provides a test verification basis for the vibration characteristic research of the motor, the obtained vibration data provides an analysis basis for vibration reduction and noise reduction, and a means is provided for distinguishing and judging the vibration source and responsibility of the unit equipment.
Claims (8)
1. A vibration test device of a low-vibration motor under the load working condition is characterized by comprising a magnetic rotor, a vortex tube and a connecting bracket; the magnetic rotor comprises a magnetic base and a plurality of magnetic steels, the number of the magnetic steels is even, the circumferential N poles/S poles of the magnetic steels are alternately arranged on the cylindrical surface of the magnetic base, the eddy current cylinder is matched with the magnetic rotor, and the magnetic steels are close to the eddy current cylinder; the vortex cylinder is connected with the connecting bracket.
2. The vibration testing device of claim 1, wherein the circumferential N poles/S poles of the magnetic steel are alternately mounted on the outer cylindrical surface of the magnetic base, and one end of the eddy current cylinder is sleeved on the outer side of the magnetic rotor.
3. The vibration testing device of claim 1, wherein the magnetic rotor has a mounting hole, the circumferential N/S poles of the magnetic steel are alternately mounted on the cylindrical surface in the mounting hole, and one end of the magnetic rotor is sleeved on the outer side of the eddy current barrel.
4. A vibration testing apparatus under a load condition of a low vibration motor according to claim 1, 2 or 3, further comprising a lifting adjusting mechanism, wherein the vortex tube is fixed to a lifting end of the lifting adjusting mechanism, and the lifting adjusting mechanism is fixed to the connecting bracket.
5. A vibration testing apparatus according to claim 4, wherein the coupling bracket comprises a mounting base, and the vortex tube is slidably connected to the mounting base.
6. The device for testing the vibration of a low vibration motor under an on-load condition as claimed in claim 4, wherein said connecting bracket further comprises a vibration isolator, and the mounting base is connected with the vibration measuring base through the vibration isolator.
7. A vibration testing apparatus according to claim 1, 2 or 3, wherein the eddy current bobbin is made of a non-magnetic metal material.
8. A vibration testing apparatus under the loaded condition of a low vibration motor according to claim 1, 2 or 3, wherein a cooling cavity is arranged in the vortex tube, and a cooling liquid is arranged in the cooling cavity; the cooling inner cavity is respectively connected with the hose through a water inlet and a water outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN112556830A (en) * | 2020-11-27 | 2021-03-26 | 杭州大路实业有限公司 | Vibration test device and method for low-vibration motor under load working condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112556830A (en) * | 2020-11-27 | 2021-03-26 | 杭州大路实业有限公司 | Vibration test device and method for low-vibration motor under load working condition |
| CN112556830B (en) * | 2020-11-27 | 2022-09-23 | 杭州大路实业有限公司 | Vibration test device and method for low-vibration motor under load working condition |
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