Fluid dynamic pressure bearing motor
Through the fluid dynamic press bearing motor structure, the noise, heating and cost problems of traditional ball bearing permanent magnet rotating motor are solved, achieving more stable and reliable motor operation and more flexible design.
Patent Information
- Application Number
- CN202420932663.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-30
AI Technical Summary
Traditional ball bearing permanent magnet rotating motors have problems such as high noise, large heat generation, abnormal vibration and high production costs, and are especially not suitable for micro motor applications.
The motor structure of fluid dynamic pressure bearings is adopted, and the direct friction between the ball and the bearing metal surface is avoided through the dynamic pressure fluid bearing, oil film lubrication is used to reduce wear, and save costs and space through the customizable axial distance of the dynamic pressure fluid bearings.
The noise and temperature rise of the motor are reduced, and the working reliability and service life are improved, while reducing production costs and design size limitations.
Smart Images
Figure CN222262373U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a fluid dynamic pressure bearing motor. Background Art
[0002] As people's requirements for life become higher and higher, the requirements for products are also increasing. Permanent magnet rotating motors are used in many products in life, and their performance directly affects the quality of life. In the existing traditional ball bearing type permanent magnet rotating motor, the direct friction between the ball and the inner and outer rings during operation will generate heat, which will have an adverse effect on the temperature rise of the entire motor system. During operation, due to direct friction, noise will be generated, which increases the difficulty of noise control of the entire motor system. Due to the common problems of the mechanical structure of the ball and the inner and outer rings, mechanical vibration will be generated during operation, which will interfere with the vibration of the entire motor system, increase the difficulty of research and development and debugging, especially when it coincides with the main vibration frequency of the motor, it will also cause resonance, reduce the overall quality of the motor, and increase the difficulty of use. Usually, ball bearings generally adopt a double bearing structure, which has limited control over the axial distance and overall size of the bearings. It is not applicable to ultra-micro motors. The double bearing structure must purchase twice the number of bearings, which has a high production cost and an increased assembly process cost. Utility Model Content
[0003] The technical problem to be solved by the embodiments of the utility model is the common problem of the double ball bearing structure used in the permanent magnet rotating motor on the market, which has complex production process, high production cost, high noise, high heat generation and abnormal vibration.
[0004] In order to solve the above problems, the embodiment of the utility model discloses a fluid dynamic pressure bearing motor to achieve technical effects.
[0005] The utility model provides a fluid dynamic pressure bearing motor, which comprises a support and a connecting part;
[0006] The rotor mechanism comprises a rotor assembly and a shaft core, wherein the rotor assembly is connected to the shaft core;
[0007] The stator mechanism comprises a bearing and a stator assembly, wherein the bearing and the stator assembly are respectively arranged on the connecting portion, and the stator assembly surrounds the bearing;
[0008] The shaft core passes through the bearing, one end of the shaft core is in the support, the rotor assembly surrounds the stator assembly, and the bearing is a hydrodynamic fluid bearing.
[0009] A further technical solution is that it further comprises a limiting member, the shaft core is provided with an annular groove, the limiting member and the annular groove are respectively in the support, and the limiting member is sleeved on the annular groove.
[0010] A further technical solution is that it also includes a connecting piece and a locking ring, and the locking ring is connected to the support and the bearing respectively.
[0011] A further technical solution is that the rotor mechanism also includes a shell, the shaft core is connected to the shell, and the rotor assembly is arranged on the shell.
[0012] A further technical solution is that the distance between the top end of the bearing and the housing is greater than 0.2 mm.
[0013] A further technical solution is that the first magnetic center line is higher than the second magnetic center line, the first magnetic center line is the magnetic center line of the rotor assembly, and the second magnetic center line is the magnetic center line of the stator assembly.
[0014] A further technical solution is that it also includes a gasket, which is between the shaft core and the support.
[0015] A further technical solution is that the diameter of the shaft core in the support gradually decreases from top to bottom.
[0016] A further technical solution is that the support is further provided with a wire hole, and the wire hole is below the stator assembly.
[0017] A further technical solution is that the shell is made of magnetic conductive material.
[0018] Compared with the prior art, the technical effects achieved by the embodiments of the present invention include:
[0019] The structure of the fluid dynamic pressure bearing motor can reduce noise and cool the entire motor, avoid direct friction between the balls and the metal surface of the bearings, minimize the noise and heat generated by the motor, and reduce shock. The oil film can effectively absorb vibrations, effectively reduce the overall vibration of the motor, and make the operation smoother. Since the shaft core and the inner hole of the bearing are lubricated by the oil film, wear can be effectively reduced, and the working reliability and service life of the motor can be improved. Due to the customizable processability of the axial distance of the dynamic pressure fluid bearing, general motors only need to use one, which saves costs compared to the previous traditional double ball bearings. Finally, since there is no need for axial clearance like double ball bearings, the axial distance of the entire motor can be effectively reduced, making the motor design size flexible in a wider range. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 An exploded diagram of a fluid dynamic pressure bearing motor structure provided by an embodiment of the utility model;
[0022] Figure 2 An exploded diagram of another fluid dynamic pressure bearing motor structure provided by an embodiment of the utility model;
[0023] Figure 3 An exploded diagram of another fluid dynamic pressure bearing motor structure provided by an embodiment of the utility model;
[0024] Figure 4 A schematic diagram of the structure of a fluid dynamic pressure bearing motor provided by an embodiment of the utility model;
[0025] Figure 5 A schematic diagram of another fluid dynamic pressure bearing motor structure provided by an embodiment of the utility model;
[0026] Figure 6 for Figure 4 Cross-section view at AA in the middle.
[0027] Reference numerals
[0028] Support 1, connecting part 11, rotor mechanism 2, rotor assembly 21, shaft core 22, stator mechanism 3, bearing 31, stator assembly 32, limiter 4, locking ring 5, gasket 6, annular groove 221, housing 23, wire hole 7. DETAILED DESCRIPTION
[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments to be described below are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0030] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.
[0031] It should also be understood that the terms used in this utility model embodiment specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model embodiments. As used in the utility model embodiment specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.
[0032] See also Figure 1-6 , an embodiment of the utility model provides a fluid dynamic pressure bearing motor. The fluid dynamic pressure bearing motor includes a support 1, which is provided with a connecting portion 11; a rotor mechanism 2, including a rotor assembly 21 and a shaft core 22, and the rotor assembly 21 is connected to the shaft core 22; a stator mechanism 3, including a bearing 31 and a stator assembly 32, and the bearing 31 and the stator assembly 32 are respectively arranged on the connecting portion 11, and the stator assembly 32 surrounds the bearing 31; the shaft core 22 passes through the bearing 31, and one end of the shaft core 22 is in the support 1, and the rotor assembly 21 surrounds the stator assembly 32, and the bearing 31 is a hydrodynamic fluid bearing. The specific introduction of each component is as follows:
[0033] In this embodiment, the fluid dynamic bearing motor is a micro brushless motor, and the connection portion 11 of the support 1 is a protruding column of the support 1 body, which is used to be connected with the bearing 31 in a clearance fit. The rotor mechanism 2 refers to a structure that rotates around the stator in the motor, including a rotor assembly 21 and a shaft core 22. The shaft core 22 and the rotor assembly 21 rotate around the stator assembly 32. The rotor assembly 21 includes a magnet. In one embodiment, the rotor assembly 21 includes a plurality of magnetic poles, and the magnet magnetization method is sinusoidal radial inner magnetization, 16 poles, and uniform pole surface. The stator mechanism 3 refers to a fixed structure in the motor, including a stator assembly 32 and a bearing 31. The shaft core 22 and the bearing 31 are connected with a clearance fit, and lubricating oil is filled between the shaft core 22 and the bearing 31. The stator assembly 32 includes an iron core, an insulating layer, a black electrophoretic coating, and an enameled wire. The iron core is provided with a plurality of slots, each slot tooth corresponds to a winding, and a Y-type wiring method is adopted. The wire tail is fixed with glue, and the iron core and the support 1 are connected with glue in a gap. The insulating layer includes an insulating powder coating, and the insulating powder coating is evenly applied to the upper and lower end surfaces of the iron core and the winding notch. The black electrophoretic coating is evenly covered on the surface except for the surface covered by the insulating powder coating of the iron core. The enameled wire is wound on the slot teeth after insulation treatment, and the three-phase wire tails of the winding are wound together, tinned, wrapped with an insulating sleeve, and fixed in the winding gap with glue.
[0034] The technical effects that can be achieved by the embodiments of the utility model include:
[0035] The structure of the hydrodynamic fluid bearing permanent magnet rotating motor can reduce noise and temperature of the entire motor, avoid direct friction between the ball and the metal surface of the bearing 31, minimize the noise and heat generated by the motor, and reduce shock. The oil film can effectively absorb vibration, effectively reduce the overall vibration of the motor, and make the operation smoother. Since the shaft core 22 and the inner hole of the bearing 31 are lubricated by the oil film, wear can be effectively reduced, and the working reliability and service life of the motor can be improved. Due to the customizable processability of the axial distance of the hydrodynamic fluid bearing, a general motor only needs to use one, which saves costs compared to the previous traditional double ball bearings. Finally, since there is no need for axial clearance like double ball bearings, the axial distance of the entire motor can be effectively reduced, making the motor design size flexible in a wider range.
[0036] Continue to see Figure 1-6 In this embodiment, a limiting member 4 is also included, and the limiting member 4 is between the support 1 and the bearing 31.
[0037] Specifically, the bearing 31 and the support 1 are separated by the limit member 4. On the one hand, there is lubricating oil between the bearing 31 and the shaft core 22. The limit member 4 can prevent the lubricating oil from leaking from the gap between the bearing 31 and the shaft core 22 along the gap between the bearing 31 and the support 1.
[0038] Furthermore, it also includes a locking ring 5, and the locking ring 5 is connected to the support 1 and the bearing 31 respectively.
[0039] Specifically, a locking ring 5 is installed on the inner hole of the support 1. Usually, the support 1 and the locking ring 5 are interference connected. The stopper 4 is below the bearing 31. One end of the shaft core 22 passes through the bearing 31 and enters the support 1. The other end of the shaft core 22 is connected to the rotor assembly 21. The locking ring 5 fixes the bearing 31 in the support 1.
[0040] Furthermore, it also includes a limiting member 4 , the shaft core 22 is provided with an annular groove 221 , the limiting member 4 and the annular groove 221 are inside the support 1 , and the limiting member 4 is sleeved on the annular groove 221 .
[0041] Specifically, the stopper 4 is a card interne, the shaft core 22 is provided with an annular groove 221, the shaft core 22 passes through the bearing 31, and is locked with the stopper 4 at the bottom of the support 1 to limit the displacement of the shaft core 22. A certain amount of clearance is left between the housing 23 and the bearing 31 to ensure that when the motor rotates, the rotor mechanism 2 and the bearing 31 are connected with a clearance without direct contact, so that the noise and heat generated by the motor are reduced to a minimum, and shock absorption can also be achieved. The oil film can effectively absorb vibration, effectively reduce the vibration of the motor as a whole, and make the operation more stable. Since the shaft core 22 and the inner hole of the bearing 31 are lubricated by the oil film, wear can be effectively reduced, and the working reliability and service life of the motor can be improved.
[0042] Furthermore, the rotor mechanism 2 further includes a housing 23 , the shaft core 22 is connected to the housing 23 , and the rotor assembly 21 is disposed on the housing 23 .
[0043] Furthermore, the housing 23 is made of magnetic conductive material.
[0044] Specifically, the shell 23 includes a magnetically conductive shell, which is usually made of soft magnetic material with a magnetic flux density less than or equal to 1.3 T. The shaft core 22 and the shell 23 are interference fit. The rotor assembly 21 includes a magnet, which is usually made of hard magnetic material. The rotor assembly 21 and the shell 23 are gap-embedded and fixed with glue. The surface of the rotor assembly 21 is covered with an electrophoretic coating. The rotor assembly 21 fits tightly with the shell 23. The surface of the shaft core 22 is covered with a passivation layer and is interference fit with the shell 23.
[0045] Furthermore, the distance between the top end of the bearing 31 and the housing 23 is greater than 0.2 mm.
[0046] Specifically, the gap between the inner wall of the housing 23 and the upper end of the bearing 31 is greater than 0.2 mm. The axial distance between the bearing 31 and the housing 23 can be customized according to the actual scenario. A gap greater than 0.2 mm can effectively avoid direct contact and mechanical friction.
[0047] Furthermore, the first magnetic center line is higher than the second magnetic center line, the first magnetic center line is the magnetic center line of the rotor assembly 21 , and the second magnetic center line is the magnetic center line of the stator assembly 32 .
[0048] Specifically, the magnetic field of the motor is mainly reflected in the gap between the stator and the rotor, also known as the "air gap magnetic field". At a certain position, the magnetic lines of force of the air gap magnetic field are all perpendicular to the rotating shaft, and there is no axial component. This position is called the magnetic center line. In this embodiment, the first magnetic center line refers to the magnetic lines of force of the rotor assembly 21 perpendicular to the shaft core 22, and the second magnetic center line refers to the magnetic lines of force of the subassembly 32 perpendicular to the shaft core 22. The height of the first magnetic center line is higher than the height of the second magnetic center line, so that a downward force is generated on the shaft core 22, and the shaft core 22 is always in contact with the gasket 6.
[0049] Furthermore, it also includes a gasket 6, which is clamped between the shaft core 22 and the bottom of the inner hole of the support 1.
[0050] Specifically, the gasket 6 is a wear-resistant sheet, the shaft core 22 abuts against the gasket 6, and the tail end of the shaft core 22 presses against the wear-resistant sheet on the bottom of the inner hole of the support 1 to prevent the shaft core 22 from rubbing against the support 1 when rotating.
[0051] Furthermore, the diameter of the shaft core 22 in the support 1 gradually decreases from top to bottom.
[0052] Specifically, the cross section of the shaft core 22 in the support 1 is conical or semicircular, and the end with a smaller diameter abuts against the gasket 6, thereby reducing the contact area between the shaft core 22 and the wear-resistant plate.
[0053] Furthermore, the support 1 is also provided with a wire hole 8 , and the wire hole 8 is below the stator assembly 32 .
[0054] Specifically, the support 1 is provided with a wire hole 8, and the wire passes through the wire hole 8 and is connected to the stator assembly 32, so that the stator assembly 32 is energized.
[0055] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0058] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0059] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.
[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.
[0062] The above is a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A fluid dynamic bearing motor, characterized in that: include: A support having a connecting portion; The rotor mechanism comprises a rotor assembly and a shaft core, wherein the rotor assembly is connected to the shaft core; The stator mechanism comprises a bearing and a stator assembly, wherein the bearing and the stator assembly are respectively arranged on the connecting portion, and the stator assembly surrounds the bearing; The shaft core passes through the bearing, one end of the shaft core is in the support, the rotor assembly surrounds the stator assembly, and the bearing is a hydrodynamic fluid bearing.
2. The fluid dynamic bearing motor according to claim 1, characterized in that: It also includes a limiting member, the shaft core is provided with an annular groove, the limiting member and the annular groove are respectively in the support, and the limiting member is sleeved on the annular groove.
3. The fluid dynamic bearing motor according to claim 2, characterized in that: It also includes a locking ring, which is connected to the support and the bearing respectively.
4. The fluid dynamic bearing motor according to claim 1, characterized in that: The rotor mechanism further comprises a shell, the shaft core is connected to the shell, and the rotor assembly is arranged on the shell.
5. The fluid dynamic bearing motor according to claim 4, characterized in that: The distance between the top end of the bearing and the housing is greater than 0.2 mm.
6. The fluid dynamic bearing motor according to claim 5, characterized in that: The first magnetic center line is higher than the second magnetic center line, the first magnetic center line is the magnetic center line of the rotor assembly, and the second magnetic center line is the magnetic center line of the stator assembly.
7. The fluid dynamic bearing motor according to claim 6, characterized in that: Also included is a gasket, which is between the shaft core and the support.
8. The fluid dynamic bearing motor according to claim 1, characterized in that: The diameter of the shaft core in the support gradually decreases from top to bottom.
9. The fluid dynamic bearing motor according to claim 1, characterized in that: The support is also provided with a wire hole, and the wire hole is below the stator assembly.
10. The fluid dynamic bearing motor according to claim 4, characterized in that: The shell is made of magnetic conductive material.