TWI649943B - Fan blade motor that suppresses vibration - Google Patents

Abstract

A fan blade motor for suppressing vibration is mainly composed of a rotor, a stator, a casing, a supporting cover body and a fan blade; the rotor is rotatably driven by an axis rotation, and the axis is provided with a short shaft portion, a long shaft portion and a working portion; the stator is disposed around a coaxial surrounding position of the rotor; the housing is provided with a rolling bearing connected to the short shaft portion; the support cover system has a length corresponding to a rotating shaft a support portion coupled to the shaft portion, the inner peripheral portion of the support portion has a rolling bearing, and the working portion protruding from the outer end of the rolling bearing; the fan blade is disposed at the working portion of the rotating shaft, and the fan blade is applied to The thrust in the front and rear directions of the rolling bearing constitutes a resistance component and a strain component, so that the torque ripple of the working portion reaches a minimum load to offset the dynamic vibration of the working portion, thereby achieving the effect of reducing the vibration 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. , often in the machine shell to install hard beams or outsourcing sound insulation materials and changing the way the parts are fixed to overcome The problem, but because of the limited size of the small parts, it is impossible to use this method to overcome the vibration and noise problems, and it has affected many development steps or even gave up because there is no countermeasure. 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 noise or aerodynamic noise generated by a gas flow, and further to solve the structure. The vibration causes the air contacting the surface of the object to vibrate, causing noise caused by pressure changes.

A vibration-damping fan blade motor that achieves the above object of the present invention includes: a rotor that is rotatably driven to rotate in an axis, the axis is provided with a rotating shaft, the rotating shaft includes a short shaft portion extending in a first direction, a long shaft portion extending in a second direction and a working portion, the length of the long shaft portion being two to three times that of the working portion; the stator is disposed around a coaxial position of the rotor; The housing is provided with a rolling bearing connected to the short shaft portion, the housing includes a side wall extending toward the first direction and a vertical wall perpendicular to the axis, and the vertical wall is fixed at the axial position a supporting bearing body having a supporting portion coupled to the long shaft portion of the rotating shaft, the supporting portion extending outward in a second direction to form an outer wall of one of the outer circumferences of the supporting cover body, the support The inner peripheral portion of the portion has a rolling bearing, and the working portion protruding from the rotating shaft formed at the outer end of the rolling bearing, the supporting portion thereby elongating the basic vibration period of the rotating shaft and increasing the rolling bearing resistance Ratio, to reduce by the push force exerted on the support cover member; a thrust fan blade, provided in the working line of the shaft portion, the fan blade is applied to the rolling direction before the resistance constituting a The component and a strain component cause the torque pulsation of the working portion to reach a minimum load to offset the dynamic vibration of the working portion, thereby achieving the effect of reducing the vibration.

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 thrust of the rotating shaft after being subjected to the thrust of the fan blade A schematic diagram of generating a resistance component in a direction in which the rolling bearing is coupled; FIG. 8 is a schematic view showing a strain component of the rotating shaft in a first direction in a direction of joining the rolling bearing after being subjected to a thrust of the fan blade; and FIG. 9 is a fan blade in the rotating shaft The thrust produces a schematic representation of the strain component in a second direction in the direction of the 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. a long shaft portion 112 and a working portion 113, the length of the long shaft portion 112 being two to three times that of the working portion 113; the rotor 1 of the rotating shaft 11 corresponding to the shape of an inner surface of the stator 2, The length of the working portion 113 of the rotating shaft 11 in the second direction of the stator 2 is short, so that the rotating shaft 11 generates a resistance component 71 and a strain component 72 in the direction of the rolling bearing 43 after being subjected to the thrust of the fan blade 6. In this way, the support portion 42 naturally achieves the effect of vibration and noise reduction; the stator 2 is disposed around the coaxial position of the rotor 1; referring to FIG. 3, the housing 3 is provided with a short shaft portion a rolling bearing 33 connected to the housing 3, the housing 3 includes a side wall 31 extending toward the first direction and a vertical wall 32 perpendicular to the axis, and the vertical wall 32 fixes the rolling bearing 33 at the axial position; As shown in FIG. 4, the support cover 4 has the same The support portion 42 of the shaft 11 to which the long shaft portion 112 is coupled, the support portion 42 extending outward in the second direction is formed on the outer wall 41 of the outer circumference of the support cover 4, and the inner peripheral portion of the support portion 42 a rolling bearing 43 having a cylindrical shape, and the working portion 113 of the rotating shaft 11 formed at an outer end of the rolling bearing 43, the supporting portion 42 thereby elongating the basic vibration period of the rotating shaft 11 and increasing the damping ratio of the rolling bearing 43 In order to reduce the thrust of the support cover 4, the shaft 11 The long shaft portion 112 is long, and the working portion 113 is short. When the rotor 1 rotates, a distributed moment toward the rolling bearing 43 is generated, so that the rotor 1 can be stabilized in a whirling mode. At the same time, since the rotor 1 and the rotating shaft 11 are collectively flutter suppressed by the supporting portion 42 and the rolling bearing 43, the free vibration behavior of the rotor 1 in a non-horizontal direction is restricted. .

As shown in FIG. 1 and FIG. 5, the fan blade 6 is disposed on the working portion 113 of the rotating shaft 11, and the thrust of the fan blade 6 applied to the front and rear directions of the rolling bearing 43 constitutes a drag component and a drag component. A component of strain 72 (as shown in FIG. 7 to FIG. 9) causes the torque pulsation of the working portion 113 to achieve a minimum load, thereby offsetting the dynomic vilbration of the working portion 113. The effect of reduced fluttering vibration.

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, the housing 3 and the supporting cover 4 are modeled in MSC Patran and Nastran, and the boundary conditions of the housing 3 and the supporting cover 4 and the fan blade 6 are analyzed using boundary conditions during actual measurement. The vibration value of the operation is compared with the actual vibration value to evaluate the correctness of the simulation. Then, the sound pressure value of the housing 3, the support cover 4 and the fan blade 6 is actually collected into the LMS Sysnoise to simulate the sound field of the fan blade 6, and the actual measured sound field. do Compare to determine if this simulation is correct. Further, the vibration value of the thrust of the fan blade 6 by the MSC Patran & Nastran is converted into the LMS Sysnoise, and is used to simulate the structure of the casing 3 when the fan blade 6 is in operation. The structural noise of the support cover 4 is.

The housing 3 and the supporting cover 4 are internally provided with an accommodating space 5 for coupling the stator 2, and the housing 3 and the supporting cover 4 are provided with two rolling bearings 33, 43 for the rotor 1 Two rolling bearings 33, 43 rotatably couple the housing 3 and the supporting cover 4, wherein the housing 3 and the supporting cover 4 can be various hollow housing designs capable of combining 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 4 of the supporting cover 4, and the stator 2 can be fixed to the housing 3 and the supporting cover by means of tight fitting, locking or snapping. In the accommodation space 5 of 4, the invention is not limited.

The rotor 1 includes a rotating shaft 11 and a permanent magnet. The rotating shaft 11 is rotatably coupled to the rolling bearing 33, 43 of the housing 3 and the supporting cover 4, and at least one end of the rotating shaft 11 can extend through the shell. The body 3 or the outside of the support cover 4. For example, the rotating shaft 11 can extend through the outside of the supporting cover 4 at one end, or the rotating shaft 11 can also be worn at both ends. The housing 3 and the outside of the support cover 4 are extended, and the invention is not limited. 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 the support portion 42 is coaxially coupled to the rotor 1, and the support portion 42 is provided. The outer wall 41 which is formed in an outer convex surface on the outer peripheral surface of the support device, and the inner peripheral portion in which the support portion 42 is formed to extend in the axial direction, has the rolling bearing 43 and the inner end portion of the rolling bearing 43 The long shaft portion 112 of the rotating shaft 11 and the working portion 113 of the rotating shaft 11 provided on the outer circumferential surface of the rolling bearing 43 along the axial direction.

Please refer to Figure 1. In the motor mechanism of the fan blade 6, the static shaft 11 and the dynamic fan blade 6 are operated under ideal conditions, and the fan blade 6 is rotated by the torque relative to the shaft 11. 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 63 ( The inclination of the mold is referred to as the draft angle; the same molding principle is also the same, and the inner surface 62 of the fan blade 6 with a center hole 61 corresponds to the working portion 113 of the rotary shaft 11, and also presents a The tilt of the small angle 63, both components are so The inclined surface is so that the cooperation of the two forms a state as 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. The resistance component 71 and the strain component 72 must exist in the vertical direction. The resistance component 71 and the strain component 72 are exactly The main reason for the vibration of the rotating shaft 11 is as shown in FIGS. 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 Lock the 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. Further, 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.

In order to suppress the phenomenon of free vibration in the non-horizontal direction caused by the unbalanced yaw of the rotating shaft 11, the problem of reducing the chattering vibration generated during the rotation is solved, and the present invention has been proposed.

The present invention mainly changes the torque pulsation of the rotating shaft 11 to the minimum torque of the working portion 113 to offset the dynamic vibration of the working portion 113, so that the length of the working portion 113 of the rotating shaft 11 is short. The center hole 61 of the fan blade 6 has a shape corresponding to the working portion 113 of the rotating shaft 11. With the above-mentioned FIGS. 7 to 9 shown, the fan blade 6 is applied to the force after being applied to The thrust in the front-rear direction 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 vibration behavior of the fan blade 6 in a non-horizontal direction can be restricted, and the effect of vibration and noise reduction can be achieved. 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 (1)

A fan blade motor for suppressing vibration includes: a rotor that is rotatably driven according to an axis rotation, the axis is provided with a rotating shaft, the rotating shaft includes a short shaft portion extending in a first direction, and a second direction a long shaft portion extending from the working portion, the length of the long shaft portion being two to three times the length of the working portion; the stator is disposed around a coaxial position of the rotor, and the rotation of the rotating shaft corresponds to a shape of an inner surface of the stator, the length of the working portion of the stator in the second direction of the rotating shaft is short; a casing is provided with a rolling bearing connected to the short shaft portion; and a supporting cover body And a support portion coupled to the long shaft portion of the rotating shaft, the support portion extending outward in a second direction to form an outer wall of one of the outer circumferences of the support cover body, the inner peripheral portion of the support portion having a cylindrical shape a rolling bearing, and the working portion of the rotating shaft formed at an outer end of the rolling bearing, the supporting portion is configured to elongate a basic vibration period of the rotating shaft and increase a damping ratio of the rolling bearing, thereby lowering the thrust of the supporting cover The long shaft portion of the rotating shaft is long, and the working portion is short. When the rotor rotates, a distribution torque is generated toward the rolling bearing direction, so that the rotating vibration state of the rotor can be stabilized, because the rotor and the rotating shaft are The support portion and the rolling bearing share flutter suppression to limit the free vibration behavior of the rotor in a non-horizontal direction; a fan blade is disposed at the working portion of the rotating shaft, and the fan blade is applied to the front and rear thrust of the rolling bearing Constitute a resistance component with one The strain component causes the torque pulsation of the working portion to reach a minimum load to offset the dynamic vibration of the working portion, thereby achieving the effect of reducing the chatter vibration.