TW201919312A - Fan blade motor for vibration suppression for reducing vibration noise and extending service life of fan blade motor - Google Patents

Abstract

The present invention discloses a fan blade motor for vibration suppression, which is mainly composed of a rotor, a stator, a shell, a supporting cover body, and a fan blade. The rotor is driven for rotation around an axis, wherein the axis is configured with a short axis portion, a long axis portion, and a working portion. The stator is disposed surrounding the circumferential position of the motor that is coaxial therewith. The shell is configured with a rolling bearing connected with the short axis portion. The supporting cover body is provided with a supporting portion connected with the long axis portion of the shaft. The inner periphery of the supporting portion is provided with a rolling bearing and a working portion protruded out of the rolling bearing. The fan blade is disposed on the working portion of the shaft. The thrust applied to the front and rear directions of the rolling bearing by the fan blade may compose a resistance component and a strain component, so that the torque pulsation of the working portion may reach the minimum load and further cancel the dynamic vibration of the working portion, so as to achieve the effect for reducing tremble vibration.

Description

 Fan blade motor that suppresses vibration  

The present invention relates to a fan blade motor that suppresses vibration, and more particularly to a fan blade motor that lengthens the basic vibration period of the rotating shaft and increases the damping ratio of the rolling bearing.

The vibration problem of the motor is a long-standing problem. As a rotating machine, the vibration problem of the motor has always existed and will continue to exist. At present, several large-scale motor manufacturing companies at home and abroad have attached great importance to the vibration problem of the motor, and have invested a lot of manpower and material resources. These companies have quite advanced sound and vibration testing software and equipment. . At present, vibration and noise indicators have become one of the important indicators for customers to choose motors, especially precision micro motors.

With the advancement of technology, many components have become smaller and smaller, and the versatile, lightweight, and easy-to-operate features have become the trend of the technology era. However, under the guidance of this trend, many countermeasures and methods to solve the problem become unsuitable for use under the structure of miniaturized parts, for example, to solve the vibration and noise problems caused by the operation of the machine, in the large machine body. It is often used to overcome the problem by installing hard beams or externally soundproofing materials and changing the fixing method of the parts. However, because the size of the small parts is limited, this method cannot be used to overcome vibration and noise problems. Because of the lack of countermeasures, it has affected many development steps and even gave up. Therefore, in miniaturized parts, the problem of effectively solving vibration and noise has become a subject that needs to be discussed.

The motivation of the present invention is derived from the vibration and noise problems generated by the transmission of the motor in the technical product. In order to solve the current problems, most of them use the method of steel milling, which is to increase the friction of the machine to reduce vibration and noise. This is not a fundamental solution, so the focus of the present invention is how to effectively suppress the vibration and noise generated by the motor in the moving parts.

The invention will start from the action principle of the motor and the resonance noise point which may be generated by the body. During the research process, the motor assembly structure diagram of the motor will be drawn by AutoCad or SolidWork 3D drawing software, and then the design of the motor body structure is changed. Based on the principle of not changing the size of the large number of parts, the effective structure for suppressing vibration is found from the motor, and some damping is added to the structure to suppress vibration and noise, and the best damping material in the machine is found to lift the motor. The efficiency of work.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure for reducing the vibration noise of a fan blade motor while increasing the service life of the fan blade motor.

A second object of the present invention is to provide a structure which suppresses the structural noise generated by the structure or the aerodynamic noise generated by the air flow, and further solves the noise generated by the structural vibration causing the air contacting the surface of the object to vibrate and cause a pressure change.

The vibration-damping fan blade motor capable of achieving the above object includes a rotor that is rotatably driven by an axis rotation, the axis being provided with a rotating shaft, the rotating shaft including a short shaft portion extending toward a first direction, and a shaft a long shaft portion extending to a second direction and a working portion, the length of the long shaft portion being two to three times the working portion; the stator is disposed around a coaxial position of the rotor; a housing a rolling bearing coupled to the short shaft portion, the housing including a side wall extending toward the first direction and a vertical wall perpendicular to the axis, and the vertical wall fixing the rolling bearing at the axial position; a supporting cover And a support portion coupled to the long shaft portion of the rotating shaft, the support portion extending outward in the second direction to form an outer peripheral wall of the support cover, the inner peripheral portion of the support portion having a rolling bearing, and the protrusion forming a working portion of a rotating shaft at an outer end of the rolling bearing, wherein the supporting portion elongates a basic vibration period of the rotating shaft and increases a damping ratio of the rolling bearing, thereby lowering a thrust of the supporting cover body A fan blade is disposed on the working portion of the rotating shaft, and the thrust of the fan blade before and after the application of the fan blade to the rolling bearing constitutes a resistance component and a strain component, so that the working portion torque ripple reaches a minimum load to offset the dynamic vibration of the working portion, and the vibration is achieved. The effect of vibration reduction.

1‧‧‧Rotor

11‧‧‧ shaft

111‧‧‧Short shaft

112‧‧‧Long shaft

113‧‧‧Working Department

2‧‧‧stator

3‧‧‧Shell

31‧‧‧ side wall

32‧‧‧ vertical wall

33‧‧‧ rolling bearings

4‧‧‧Support cover

41‧‧‧ outer wall

42‧‧‧Support

43‧‧‧ rolling bearings

5‧‧‧ accommodating space

6‧‧‧Fan blades

61‧‧‧ center hole

62‧‧‧ inner surface

63‧‧‧Small angle

71‧‧‧resistance component

72‧‧‧Strain component

1 is a schematic cross-sectional view of a fan blade motor for suppressing vibration according to the present invention; FIG. 2 is a schematic side view of the rotor; FIG. 3 is a schematic cross-sectional view of the casing; FIG. 4 is a schematic cross-sectional view of the support cover; FIG. 6 is a schematic cross-sectional view showing the inner surface of the center hole of the fan blade corresponding to the rotating shaft, and also showing a small angle of inclination; FIG. 7 is the direction of the rotating shaft after being subjected to the thrust of the fan blade. Schematic diagram of the resistance component in combination with the direction of the rolling bearing; FIG. 8 is a schematic view showing the strain component of the rotating shaft in the first direction in the direction of the combined rolling bearing after being subjected to the thrust of the fan blade; and FIG. 9 is generated after the thrust of the rotating shaft is received by the fan blade A schematic representation of the strain component in a second direction in the direction of the combined rolling bearing.

Referring to FIG. 1 , the vibration-damping fan blade motor provided by the present invention mainly comprises: a rotor 1, a stator 2, a casing 3, a supporting cover 4 and a fan blade 6.

As shown in FIG. 2, the rotor 1 is rotatably driven by an axis, and the axis is provided with a rotating shaft 11 including a short shaft portion 111 extending in a first direction and extending in a second direction. The length of the long shaft portion 112 and the working portion 113, the length of the long shaft portion 112 is two to three times that of the working portion 113; the rotor 1 of the rotating shaft 11 corresponds to the shape of the inner surface of the stator 2, and the shaft 11 in the second direction The working portion 113 has a short length, so that the rotating shaft 11 generates a resistance component 71 and a strain component 72 toward the direction of the combined rolling bearing 43 after being subjected to the thrust of the fan blade 6, so that the supporting portion 42 naturally achieves the effect of vibration and noise reduction; The 2 series is disposed around the coaxial position of the rotor 1; referring to FIG. 3, the housing 3 is provided with a rolling bearing 33 connected to the short shaft portion 111, and the housing 3 includes an extension extending toward the first direction. a side wall 31 and a vertical wall 32 perpendicular to the axis, and the vertical wall 32 fixes the rolling bearing 33 at an axial position; and as shown in FIG. 4, the supporting cover 4 has a long shaft portion with the rotating shaft 11. 112 connected support portion 42, the support portion 42 facing The outer circumferential wall 41 of the support cover 4 is formed in a convex shape in a bifurcated manner. The inner peripheral portion of the support portion 42 has a cylindrical rolling bearing 43 and a shaft 11 projecting from the outer end of the rolling bearing 43. The working portion 113 is configured to lengthen the basic vibration period of the rotating shaft 11 and increase the damping ratio of the rolling bearing 43 to reduce the thrust of the supporting cover 4, and the long shaft portion 112 of the rotating shaft 11 is long, and the working portion thereof 113 is short, when the rotor 1 rotates to generate a distributed moment toward the rolling bearing 43, so that the rotor 1 can be stabilized in a whirling mode, and this design is supported by the rotor 1 and the rotating shaft 11 The portion 42 and the rolling bearing 43 share flutter suppression to limit the free vibration behavior of the rotor 1 in a non-horizontal direction; the fan blade 6 is disposed on the rotating shaft 11 as shown in FIGS. 1 and 5 The working portion 113, the thrust of the fan blade 6 applied to the front and rear directions of the rolling bearing 43 constitutes a drag component 71 and a component of strain (as shown in FIGS. 7 to 9), so that the working portion 113 rotates. Pulsation reach minimum load (minimum load) in turn offset the dynamic vibration (dynomic vilbration) of the working portion 113, to flutter vibration (fluttering vibration) to reduce the effect.

For the establishment of the vibration and noise prediction mode of the fan blade 6, the invention adopts the structural simulation analysis software-MSC Patran and Nastran and the sound field simulation analysis software-LMS Sysnoise. Firstly, a solid model of the casing 3 and the supporting cover body 4 is established in the MSC Patran and Nastran, and the boundary conditions of the casing 3 and the supporting cover body 4 and the vibration values of the fan blade 6 are analyzed using the boundary conditions in actual measurement. Then compare with the actual vibration value to evaluate the correctness of the simulation. Then, the actual sound pressure values of the casing 3, the supporting cover 4 and the fan blades 6 are sent to the LMS Sysnoise to simulate the sound field of the fan blades 6 when they are operated, and then compared with the actual measured sound field. To determine if this simulation is correct. Further, the vibration value of the thrust of the fan blade 6 simulated by MSC Patran & Nastran is transferred into the LMS Sysnoise, which is used to simulate the structure 3 or the support cover of the fluttering vibration when the fan blade 6 is in operation. 4 structural noise.

The housing 3 and the supporting cover 4 are provided with an accommodating space 5 for coupling the stator 2, and the housing 3 and the supporting cover 4 are provided with at least one rolling bearing 33, 43 for the rotor 1 to Rolling bearings 33, 43 rotatably couple the housing 3 and the support cover 4, wherein the housing 3 and the support cover 4 can be of various hollow housing designs for the combination of the stator 2 and the rotor 1. The invention is not limited. In this embodiment, the housing 3 and the support cover 4 are each provided with a rolling bearing 33 and a rolling bearing 43. The two rolling bearings 33, 43 have a spacing between each other for assembly of the rotor 1.

The stator 2 is coupled to the housing 3 and the receiving space 5 of the supporting cover 4, and the stator 2 can be fixed to the housing 3 and the supporting cover 4 by means of tight fitting, locking or snapping. The present invention is not limited in the accommodation space 5.

The rotor 1 includes a rotating shaft 11 and a permanent magnet. The rotating shaft 11 is rotatably coupled to the housing 3 and the rolling bearings 33, 43 of the supporting cover 4, and at least one end of the rotating shaft 11 can extend through the housing 3. Or the outside of the support cover 4. For example, the rotating shaft 11 can extend out of the outer side of the supporting cover 4 at one end, or the rotating shaft 11 can also protrude from the outer side of the housing 3 and the supporting cover 4 at opposite ends. Limit it. The permanent magnet can be coupled to the rotating shaft 11. The permanent magnet is fixed to the rotating shaft 11 by locking, clamping, bonding, tight fitting or welding, and the air gap between the permanent magnet and the stator 2 is provided. After the stator 2 is energized, an alternating magnetic field can be generated through the air gap to drive the rotor 1 to rotate.

Next, the support cover 4 of the present invention is coupled to the rotor 1 disposed in the rolling bearing 43, and is characterized in that it has a support portion 42 coupled to the rotor 1 coaxially, and a support portion 42 is convex. An outer peripheral wall 41 formed on the outer peripheral surface of the supporting device, and a rolling bearing 43 having an inner peripheral portion forming the supporting portion 42 extending in the axial direction, and a long shaft portion 112 of the rotating shaft 11 formed at an inner end portion of the rolling bearing 43 And a working portion 113 of the rotating shaft 11 provided on the outer peripheral surface of the rolling bearing 43 along the axial direction.

Please refer to Figure 1. In the fan blade 6 motor mechanism, the static shaft 11 and the dynamic fan blade 6 operate under ideal conditions in that the fan blade 6 is rotationally moved relative to the shaft 11 after being subjected to a moment. Ideally, the force will only fall on its plane of rotation, but in actual conditions, due to manufacturing requirements, the working portion 113 of the shaft 11 cannot be completely parallel to the direction of the axis, but presents a small angle (in the mold forming The tilting angle is referred to as the drafting angle; the same molding principle is also the same, and the inner surface 62 of the fan blade 6 whose center hole 61 corresponds to the working portion 113 of the rotating shaft 11 also exhibits a tilt of a small angle 63, two The members are so inclined that the fit of the two forms a state like a sleeve, as shown in FIG.

Therefore, once the fan blade 6 is rotated by force, the force vector must not fall on the plane of rotation. There must be a resistance component 71 and a strain component 72 in the vertical direction. The resistance component 71 and the strain component 72 are the vibration of the shaft 11 The main reason is shown in Figures 7 to 9.

In the past design, on the one hand, in order to prevent the rotating shaft 11 from being detached from the rolling bearing 43 during rotation, and on the other hand, in order to suppress the vibration of the rolling bearing 43 caused by the undefined force in the vertical direction, a limited force is generally added, such as a screw. Or limit the design of the hook. However, the way the screws are locked increases the material cost, and there is a space limitation in the way the hooks are made. Moreover, the method of restricting the rotating shaft 11 often has a problem that the gap is not easily adjusted. If the adjustment is improper and the unstable force between the limiting force and the axial force of the rotating shaft 11 is caused, vibration and noise may still occur.

The present invention has been made in order to suppress the phenomenon of free vibration in a non-horizontal direction caused by the unbalanced yaw of the rotating shaft 11, and to solve the problem of reduction in chattering vibration generated at the time of rotation.

The present invention mainly changes the torque pulsation of the rotating shaft 11 to the working portion 113 to achieve a minimum load and thereby cancels the dynamic vibration of the working portion 113, so that the diameter of the working portion 113 of the rotating shaft 11 is short. The center hole of the fan blade 6 has a shape corresponding to the working portion 113 of the rotating shaft 11. 7 to 9, the thrust of the fan blade 6 after the force is applied to the front and rear directions of the rolling bearing 43 constitutes the resistance component 71 and the strain component 72, and is instead oriented toward the inner side, so that the fan blade 6 can also be restricted. Non-horizontal vibration behavior achieves the effect of vibration and noise reduction. In addition, the present invention also eliminates the problem of adjusting the screw lock gap or the hook gap in the prior design, which is convenient in design, can reduce the height of the transmission member, save manufacturing cost, and make the product more competitive. force.

In summary, this case is not only innovative in terms of space type, but also can enhance the above-mentioned multiple functions compared with the customary items. It should fully meet the statutory invention patent requirements of novelty and progressiveness, and apply for it according to law. This invention patent application, in order to invent invention, to the sense of virtue.

Claims (2)

 A fan blade motor for suppressing vibration includes: a rotor rotatably driven by an axis, wherein the axis is provided with a rotating shaft, the rotating shaft includes a short shaft portion extending in a first direction, and extending in a second direction The long shaft portion and the working portion, the length of the long shaft portion is two to three times that of the working portion; the stator is disposed around the coaxial position of the rotor; a housing is provided with a short shaft portion a supporting rolling bearing; a supporting cover having a supporting portion coupled to the long shaft portion of the rotating shaft, the supporting portion extending outward in the second direction and formed on the outer peripheral wall of the supporting cover body, the inner circumference of the supporting portion The portion has a cylindrical rolling bearing, and a working portion protruding from a rotating shaft formed at an outer end of the rolling bearing, the supporting portion thereby elongating a basic vibration period of the rotating shaft and increasing a damping ratio of the rolling bearing, thereby lowering the supporting cover body Thrust; a fan blade is disposed at a working portion of the rotating shaft, and the thrust of the fan blade before and after the application of the fan blade to the rolling bearing constitutes a resistance component and a strain component, so that the working portion torque Further movement to achieve the minimum load dynamic offset vibrating working portion, to achieve the effect of reducing chatter vibration.    The vibration-damping fan blade motor according to claim 1, wherein the long shaft portion of the rotating shaft is long and the working portion is short, and when the rotor rotates, a distribution torque toward the rolling bearing direction is generated, which is stable. The rotor rotates in an oscillating state, and at the same time, the rotor and the rotating shaft are collectively shaken by the support portion and the rolling bearing to suppress the free vibration behavior of the rotor in a non-horizontal direction.