Flat motor

Abstract

The utility model relates to the field of motors, and particularly discloses a flat motor, comprising a winding arranged on a circuit board; the magnet rotating shaft assembly comprises a magnet and a rotating shaft fixed relative to the position of the magnet, the magnet has a flat shape and is adjacent to the winding, the magnet rotating shaft assembly can rotate around a rotating axis under the driving of the winding, and the rotating shaft is provided with a threaded part along the rotating axis; the moving part is matched with the thread part; and the magnetic shielding shell is fixed relative to the circuit board, a guide hole in the magnetic shielding shell is matched with the moving part, and the magnetic shielding shell is configured to enable the magnet rotating shaft assembly to only drive the moving part to move along the rotating axis. According to the flat motor, the number of components is small, the size is small, driving is stable, and the flat motor has good magnetic shielding performance.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a flat motor. Background Art

[0002] Motors are widely used in various fields to drive corresponding components in equipment. In some equipment, it is necessary to drive components to move linearly. For this purpose, some motors are designed to convert the rotational motion of their magnets into linear motion of components.

[0003] Existing motors that can convert the rotational motion of a magnet into linear motion generally have a large number of transmission components, so they are bulky and complex to assemble. On the other hand, at present, many fields continue to put forward the demand for smaller and more stable motors. For example, some devices in portable electronic devices need to be equipped with motors of relatively small size.

[0004] Therefore, it is still desirable to have an electric machine that can address at least some of the needs in the above-mentioned situation. Utility Model Content

[0005] In view of the above problems, according to the first aspect of the utility model, a flat motor is proposed, characterized in that it includes: a winding arranged on a circuit board; a magnet shaft assembly, including a magnet and a shaft fixed relative to the magnet, the magnet having a flat shape and adjacent to the winding, the magnet shaft assembly can rotate around a rotation axis under the drive of the winding, and the shaft is provided with a threaded portion along the rotation axis; a moving part, which cooperates with the threaded portion; a magnetic shielding shell, which is fixed relative to the circuit board, and has a guide hole extending in the direction of the rotation axis and cooperating with the moving part, so that the magnet shaft assembly can only drive the moving part to move along the rotation axis.

[0006] The flat motor according to the first aspect of the utility model has a small number of components, and can achieve a small volume, especially a relatively small size in the axial direction to form a flat shape. Therefore, the motor is also particularly suitable for devices with specific requirements on shape, such as focusing mechanisms of imaging devices. In addition, the flat motor can stably drive its moving parts through its component arrangement. Furthermore, the flat motor also has good magnetic shielding performance under the premise of a small size, and is suitable for use in various devices with high requirements on magnetic shielding.

[0007] The flat motor according to the present invention may have one or more of the following features.

[0008] According to one embodiment, preferably, the moving part includes a main body and a plurality of guide posts protruding from the main body and extending in the direction of the rotation axis, and the magnetic shielding shell is arranged radially outside the magnet shaft assembly and has a plurality of guide holes extending along the rotation axis to receive and guide the plurality of guide posts therein. The flat motor according to this embodiment can achieve a further flattened shape through the construction of the magnetic shielding shell, and the movement of the moving part is more stable through the cooperation of the plurality of guide holes and the plurality of guide posts.

[0009] According to one embodiment, preferably, the motor further comprises a cover, the cover separates the main body of the moving part from the winding and the magnet shaft assembly, the cover comprises a cover center hole, and the threaded portion of the shaft cooperates with the moving part through the cover center hole. In the flat motor according to this embodiment, by providing the cover, the magnet shaft assembly can be better protected.

[0010] According to one embodiment, preferably, the magnetic shielding shell and the cover are combined to form the complete motor housing, wherein the magnetic shielding shell includes a recessed portion for assembly with the cover. According to this embodiment, the flat motor forms a complete motor housing through the two components of the magnetic shielding shell and the cover, and the motor housing is easy to assemble and has a stable structure.

[0011] According to one embodiment, preferably, the size of the motor housing along the rotation axis is smaller than the size perpendicular to the rotation axis, thereby forming an overall flat shape, the axial side surfaces of the magnetic shielding shell and the cover are flush with each other, and / or the magnetic shielding shell has a polygonal shape in a plane perpendicular to the rotation axis, the guide hole is arranged at the beveled portion of the polygon, the magnetic shielding shell is made of magnetic shielding material, and / or the cover is made of metal. According to the flat motor of this embodiment, the motor housing has a flat appearance, a more stable structure, and the manufacturing and assembly process of its components is relatively simple.

[0012] According to one embodiment, preferably, the cover includes an axial side portion and a lateral side portion, the axial side portion extends perpendicularly to the rotation axis, and the lateral side portion extends radially outside the axial side portion and parallel to the rotation axis, wherein the end of the lateral side portion is provided with a first bent portion extending radially outward, the first bent portion is configured to abut against the edge of the circuit board hole to be matched, and / or the end of the lateral side portion of the cover is also provided with a second bent portion extending radially inward, the second bent portion fixes the cover to the magnetic shielding shell. According to the flat motor of this embodiment, its magnetic shielding shell and cover can be assembled more firmly to each other, and the assembled magnetic shielding shell and cover can be firmly installed to the circuit board to be matched.

[0013] According to one embodiment, preferably, the shaft of the magnet shaft assembly includes a first end and a second end opposite to the first end, the cover center hole is configured to accommodate the first end, and / or the magnetic shielding shell further includes a spacer plate arranged opposite to the cover, the spacer plate is provided with a middle through hole at the position of the rotation axis, and the middle through hole is configured to accommodate the second end. According to the flat motor of this embodiment, the rotational motion of the magnet shaft assembly is more stable.

[0014] According to one embodiment, preferably, the threaded portion of the shaft is a threaded hole extending along the rotation axis, and the moving component further comprises a threaded column protruding from the body and extending along the rotation axis, the threaded column being configured to cooperate with the threaded hole. The flat motor according to this embodiment has an overall flatter structure.

[0015] According to one embodiment, preferably, the magnet shaft assembly further includes a magnet cover plate fixed to the magnet, the magnet cover plate is made of a material capable of shielding magnetic field radiation, the magnet cover plate covers the magnet, the shaft of the magnet shaft assembly includes a core and a support, the core passes through the central through hole of the magnet cover plate, the support is integrally formed between the core and the magnet cover plate by molding to fix the core and the magnet cover plate to each other, and the threaded portion is arranged in the core. The magnet shaft assembly of the flat motor according to this embodiment has a stable overall structure, can have a high manufacturing accuracy, and can play a magnetic shielding effect in coordination with other components of the flat motor.

[0016] According to one embodiment, preferably, the support member includes a first section closer to the cover than the magnet cover plate, a second section farther from the cover than the magnet cover plate, and a connecting section between the first section and the second section.

[0017] According to one embodiment, preferably, the first section of the support member is provided with a first lubricant groove for storing lubricant on a surface facing the cover, and the first lubricant groove is filled with lubricant to provide lubrication to the gap between the support member and the cover through capillary action when the support member and the cover move relative to each other. According to this embodiment of the flat motor, long-term effective lubrication can be provided between the magnet shaft assembly and the cover.

[0018] According to one embodiment, preferably, the first section of the support member includes a first ring portion and a second ring portion located on the circumferential outer side of the core, protruding in a direction away from the second section and spaced apart from each other in the radial direction, the side surface of the first ring portion slidably contacts the radial inner surface of the central hole of the cover, the top surface of the second ring portion slidably contacts the axial inner surface of the cover, and the first ring portion, the second ring portion, and the surface connecting the first ring portion and the second ring portion define the first lubricant groove. According to the flat motor of this embodiment, the first lubricant groove is realized by the specific structural design of the support member, which can provide long-term effective lubrication between the magnet shaft assembly and the cover.

[0019] According to one embodiment, preferably, the magnetic shielding shell further comprises a spacer plate arranged opposite to the cover, the spacer plate comprises a middle through hole, the second section of the support member passes through the middle through hole, the spacer plate is provided with a second lubricant groove for storing lubricant on a surface facing the second section, the second lubricant groove is filled with lubricant, so as to provide lubrication to the gap between the support member and the spacer plate by capillary action when the support member and the spacer plate move relative to each other. According to the flat motor of this embodiment, long-term effective lubrication can be provided between the magnet shaft assembly and the spacer plate.

[0020] According to one embodiment, preferably, the second section of the support member includes an annular step portion located on the circumferential outer side of the core and protruding radially, and the spacer plate is provided with a third ring portion and a fourth ring portion located on the circumferential outer side of the middle through hole of the spacer plate, protruding toward the annular step portion and spaced apart from each other in the radial direction, and the top surfaces of the third ring portion and the fourth ring portion are respectively slidably in contact with the surface of the annular step portion, and the third ring portion, the fourth ring portion and the surface connecting the third ring portion and the fourth ring portion define the second lubricant groove. According to the flat motor of this embodiment, the second lubricant groove is realized by a specific structural design on the support member and the spacer plate, so that long-term effective lubrication can be provided between the magnet shaft assembly and the spacer plate.

[0021] According to one embodiment, preferably, the central through hole of the magnet cover has a non-cylindrical radial inner surface, the connecting section of the support has a radial outer surface matching the radial inner surface, and / or the magnet cover is circumferentially provided with a plurality of auxiliary through holes around the central through hole, and / or the outer surface of the core is provided with an annular groove extending around the rotation axis, and part of the support is embedded and molded on the annular groove. According to the flat motor of this embodiment, the components of the magnet shaft assembly are more firmly fixed to each other and are not easy to loosen from each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention are briefly introduced below. The drawings are only used to show some embodiments of the present invention, but not to limit all embodiments of the present invention thereto.

[0023] Figure 1 It is a perspective view of a flat motor according to the utility model.

[0024] Figure 2 It is an exploded view of the flat motor according to the utility model.

[0025] Figure 3A and Figure 3B They are perspective views of the core and the magnet cover of the magnet shaft assembly of the flat motor according to the present invention, Figure 3C and Figure 3D A perspective view and a top view, respectively, of the core and magnet cover plate arranged together.

[0026] Figure 4A is a perspective view of a magnet shaft assembly of a flat motor according to the utility model, Figure 4B is a perspective view of the support of the magnet shaft assembly, Figure 4C A cross-sectional view of the magnet shaft assembly is shown, but Figure 4C The magnets are not shown. Figure 4D shows a cross-sectional view of a magnet shaft assembly, and Figure 4D The magnet is shown in FIG.

[0027] Figure 5A is a perspective view of a magnetic shielding housing of a flat motor according to the utility model, Figure 5B It is a perspective view of a cover of a flat motor according to the utility model.

[0028] Fig. 6A A perspective view shows a magnet shaft assembly arranged in a magnetic shielding housing, Figure 6B A perspective view shows a magnetic shield housing and a cover assembled to each other, and a magnet shaft assembly arranged in the magnetic shield housing, Figure 6C The magnetic shield case and the cover assembled to each other are shown in a cross-sectional view, and the magnet shaft assembly arranged within the magnetic shield case is shown.

[0029] Figure 7 The schematic diagram shows the assembly of the moving component, the magnetic shielding shell and the magnet shaft assembly in the flat motor according to the utility model.

[0030] Fig. 8A The cross-sectional view shows the state in which the moving parts in the flat motor according to the utility model are in the retracted position. Figure 8BThe moving part is shown in cross section in a partially extended position.

[0031] Fig. 9 A schematic top view of a circuit board of a flat motor according to the present invention is shown.

[0032] Reference numerals list

[0033] 1 Flat motor

[0034] 100 Circuit Boards

[0035] 120 Control circuit board

[0036] 130 Winding

[0037] 200 Magnet shaft assembly

[0038] 210 Magnet

[0039] 220 Shaft

[0040] 221 First End

[0041] 222 Second end

[0042] 225 Threaded part

[0043] 230 Magnetic Cover

[0044] 235 center through hole

[0045] 236 Radial inner surface

[0046] 238 Auxiliary through hole

[0047] 240 Core

[0048] 245 Annular groove

[0049] 250 Support

[0050] 251 Part 1

[0051] 252 Second Section

[0052] 253 Connection segment

[0053] 261 First Ring

[0054] 262 Second Ring

[0055] 263 Annular step

[0056] 265 First lubricant tank

[0057] 266 Second lubricant groove

[0058] 300 moving parts

[0059] 310 Main Body

[0060] 311 First Edge

[0061] 312 The Second Edge

[0062] 313 slots

[0063] 315 Threaded Post

[0064] 320 Guide column

[0065] 400 Magnetic Shielding Enclosure

[0066] 410 Lateral Enclosure

[0067] 420 Bevel

[0068] 425 Guide hole

[0069] 431 First recess

[0070] 432 Second recess

[0071] 440 Spacer

[0072] 443 Third Ring

[0073] 444 Fourth Ring

[0074] 445 Middle through hole

[0075] 450 Motor housing

[0076] 500 caps

[0077] 510 Axial side face

[0078] 515 Cover center hole

[0079] 520 lateral side

[0080] 521 First bending part

[0081] 522 Second bending part

[0082] A Rotation axis DETAILED DESCRIPTION

[0083] In order to make the purpose, technical solution and advantages of the technical solution of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described in combination with the drawings of the specific embodiments of the utility model. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0084] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate quantity restrictions. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to direct connections, but may include indirect connections. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0085] The present invention will be described in detail below by describing exemplary embodiments.

[0086] Figure 1 FIG. 1 shows a perspective view of a flat motor 1 according to the present invention. Figure 1 As shown, the flat motor 1 has a substantially flat structure, and its dimension along one direction (ie, a direction parallel to the rotation axis A of the magnet shaft assembly 200 ) is smaller than its dimension along a direction orthogonal to the rotation axis A direction. Figure 1 The moving part 300, magnetic shielding shell 400 and cover 500 of the flat motor 1 are shown. The magnetic shielding shell 400 and cover 500 together form a complete motor housing 450, the main body 310 of the moving part 300 is arranged on the relatively outer side of the motor housing 450, and the moving part 300 can move relative to the motor housing 450 along the rotation axis A, as described in detail later.

[0087] According to an embodiment of the utility model, the moving component 300 can be fixed to other components in the device on which the flat motor 1 is installed, so as to drive other components to move along the rotation axis A. To this end, other structures can be provided on the moving component 300. For example, a protruding rib for strengthening its structure can be provided on the surface of the moving component 300, and grooves for fixing or connecting with other components can be provided on the first edge 311 and the second edge 312 thereof.

[0088] Figure 2 FIG. 1 shows an exploded view of a flat motor 1 according to the present invention. Figure 2 As shown, the flat motor 1 includes, in addition to the moving part 300, the magnetic shielding housing 400 and the cover 500, a winding 130 (see also Fig. 9 ) and a magnet shaft assembly 200. The circuit board 100 is arranged in a space surrounded by a magnetic shielding shell 400 and is fixed relative to the magnetic shielding shell 400. The magnet shaft assembly 200 includes a magnet 210, a core 240, a support member 250 and a magnet cover plate 230 fixed to each other. Figure 2 As shown, the magnet 210 has a flat shape, and the winding 130 on the circuit board 100 is configured to drive the magnet 210 to rotate, thereby driving the entire magnet shaft assembly 200 to rotate.

[0089] Figure 2 A control circuit board 120 is also shown. The control circuit board 120 is configured to be arranged on the relatively outer side of the motor housing 450, for example, on the side of the magnetic shielding housing 400 opposite to the cover 500. A control circuit for controlling the operation of the winding 130 is provided on the control circuit board 120. To this end, the control circuit board 120 is electrically connected to the circuit board 100. The control circuit board 120 may be a separate component and is fixed to the side of the magnetic shielding housing 400 opposite to the cover 500.

[0090] Reference Figures 3A-3D and Figures 4A-4D , describing the specific structure of the magnet shaft assembly 200 of the flat motor 1 according to the present invention.

[0091] The magnet shaft assembly 200 includes a magnet 210, a core 240, a support member 250 and a magnet cover plate 230. Figure 3A As shown, the core 240 has a cylindrical shape and is provided with a threaded portion 225, on which a thread extending along the longitudinal direction of the core 240 (i.e., the direction of the rotation axis A) is provided. Specifically, the threaded portion 225 is a threaded hole, which is provided in the core 240 and extends along the direction of the rotation axis A. The outer surface of the core 240 is also provided with an annular groove 245 extending around the rotation axis A, which is used to be embedded and fixed with the molded support member 250.

[0092] like Figure 3B As shown, the magnet cover plate 230 has a substantially disk shape so as to cover the magnet 210 on one side of the flat magnet 210. Figure 2 and Figure 4D The magnet cover 230 is fixed to the magnet 210 on one side of the magnet 210, and the magnet cover 230 is made of a material that can shield the magnetic field radiation, thereby shielding the magnetic field on this side. For example, the magnet cover 230 can be made of a magnetically conductive material such as iron or silicon steel. Back Figure 3B The magnet cover plate 230 has a central through hole 235 penetrating the center thereof and a plurality of auxiliary through holes 238 arranged circumferentially around the central through hole 235. The central through hole 235 has a non-circular shape (a square shape with four rounded corners in this embodiment), that is, the central through hole 235 has a non-cylindrical radial inner surface 236, and the auxiliary through holes 238 have a substantially elongated shape.

[0093] Figure 3C and Figure 3D The arrangement of the core 240 relative to the magnet cover plate 230 when assembled into the magnet shaft assembly is shown. Specifically, when assembled into the magnet shaft assembly, the core 240 passes through the central through hole 235 of the magnet cover plate 230. In this arrangement, the support member 250 is integrally formed between the core 240 and the magnet cover plate 230 by molding to fix the core 240 and the magnet cover plate 230 to each other.

[0094] Reference Figures 4A-4D , the support member 250 surrounds the radial outer side of the core 240 in the direction of the rotation axis A, and the materials of the support member 250 are connected to each other on both sides of the magnet cover plate 230 via the central through hole 235 and the auxiliary through hole 238 of the magnet cover plate 230. Thus, the support member 250 includes a first section 251 located on one side relative to the magnet cover plate 230 (the side closer to the cover 500 in the assembled state), a second section 252 located on the opposite other side relative to the magnet cover plate 230 (the side farther away from the cover 500 in the assembled state), and a connecting section 253 between the first section 251 and the second section 252.

[0095] In addition, refer to Figures 3A-3D, the material of the support member 250 fills the space between the radial inner surface 236 of the central through hole 235 and the radial outer surface of the core 240, thereby defining the connecting section 253, and therefore, the connecting section 253 of the support member 250 has a radial outer surface that matches the radial inner surface 236 of the central through hole 235. In addition, the material of the support member 250 also fills the space in the auxiliary through hole 238. These arrangements contribute to the firm fixation between the support member 250 and the magnet cover plate 230. In addition, as mentioned above, the material of the support member 250 fills the space in the annular groove 245 on the outer surface of the core 240, so that a portion of the support member 250 is insert-molded on the annular groove 245. This arrangement contributes to the firm fixation between the support member 250 and the core 240.

[0096] Also refer to Figure 2 , the magnet 210 has a flat disc shape and has a central through hole. When the magnet 210 is fixed to the magnet cover 230 (see, for example, Figure 4D ), the core 240 and the support 250 also pass through the central through hole of the magnet 210, and at the same time, the various components of the magnet shaft assembly 200 are fixed to each other so as to be able to rotate together around the rotation axis A. Among them, the core 240 and the support 250 form the shaft 220 of the magnet shaft assembly 200, and the shaft 220 defines a first end 221 and a second end 222 opposite to the first end 221 along the rotation axis A.

[0097] Reference Figures 4B-4D The support member 250 is further provided with specific structures on its first section 251 and second section 252. The first section 251 of the support member 250 is provided with a first ring portion 261 and a second ring portion 262 protruding in a direction away from the second section 252 and spaced apart from each other in the radial direction on the circumferential outer side of the core 240. The second section 252 of the support member 250 is provided with a radially protruding annular step portion 263 on the circumferential outer side of the core 240.

[0098] Figure 5A A magnetic shielding housing 400 is shown. Figure 5A As shown, the magnetic shielding shell 400 includes a spacer plate 440 and a lateral surrounding portion 410 fixedly arranged around the entire edge of the spacer plate 440. The magnetic shielding shell 400 has an overall flat shape. In other words, the dimension of the lateral surrounding portion 410 extending in the direction of the rotation axis A is smaller than the dimension of the spacer plate 440 in the direction perpendicular to the rotation axis A. The spacer plate 440 and the lateral surrounding portion 410 together define the internal space of the magnetic shielding shell 400, and the internal space is used to arrange most of the structures of the circuit board 100 and the magnet shaft assembly 200. As shown in FIG. Figure 5AAs shown, the magnetic shielding shell 400 has a polygonal shape in a plane perpendicular to the rotation axis A, and is a square shape in the illustrated embodiment. Guide holes 425 extending along the direction of the rotation axis A are provided at each oblique angle portion 420 of the polygon, and the guide holes 425 are used to cooperate with the moving part 300, so as to guide the moving part 300 to move linearly only along the direction of the rotation axis A. Among them, the magnetic shielding shell 400 is made of magnetic shielding material. The spacer 440 and the lateral surrounding portion 410 can be formed integrally.

[0099] Figure 5B A cover 500 is shown. Figure 5B As shown, the cover 500 includes an axial side portion 510 and a lateral side portion 520. The axial side portion 510 and the lateral side portion 520 are both plate components, and the two can be formed in one piece. The axial side portion 510 is configured to extend perpendicularly to the rotation axis A, and the center of the axial side portion 510 is provided with a cover center hole 515 that penetrates. The lateral side portion 520 extends radially outwardly of the axial side portion 510 and parallel to the rotation axis A. The end of the lateral side portion 520 is also provided with a first bending portion 521 extending radially outward and a second bending portion 522 extending radially inward. According to one embodiment of the utility model, the cover 500 is made of metal.

[0100] Next, refer to Figures 6A-6C , illustrating the relative positions of the magnetic shielding housing 400, the cover 500 and the magnet shaft assembly 200 in the assembled state.

[0101] Fig. 6A FIG. 4 shows a state where the magnet shaft assembly 200 is located in the inner space of the magnetic shielding housing 400. Fig. 6A As shown, in the assembled state, the magnetic shielding shell 400 is arranged on the radial outer side of the magnet shaft assembly 200. Specifically, the lateral surrounding portion 410 with a square cross section surrounds the radial outer side of the magnet shaft assembly 200, and the distance between the inner side wall of the lateral surrounding portion 410 and the radial outer side of the magnet shaft assembly 200 can be set to be smaller. On the other hand, four guide holes 425 are respectively arranged at the four beveled portions 420 of the lateral surrounding portion 410. As a result, the flat motor 1 has a further compact structure.

[0102] Figure 6B Shown in Fig. 6A , a perspective view of the magnetic shielding housing 400 and the cover 500 in a state of being assembled with each other. The magnetic shielding housing 400 and the cover 500 together form a complete motor housing 450. The motor housing 450 also has an overall flat shape, and its dimension along the rotation axis A is smaller than the dimension perpendicular to the rotation axis A. Figure 6B As shown, the axial side surface portion 510 of the cover 500 is Figure 6BThe upper side shown substantially completely covers the upper side of the magnet shaft assembly 200, with only the first end 221 of the magnet shaft assembly 200 being received in and accessible through the cover center hole 515 of the cover 500. Thus, the cover 500 is able to space the body 310 of the moving part 300 relative to the winding 130 and the magnet shaft assembly 200, while the threaded portion 225 (i.e., the threaded hole) at the center of the magnet shaft assembly 200 is still able to cooperate with the moving part 300 through the cover center hole 515.

[0103] Continue to refer Figure 6B When the motor housing 450 is assembled and enclosed, the axial side surfaces of the magnetic shielding shell 400 and the cover 500 are flush with each other, and the lateral side surfaces are also flush with each other. To this end, the magnetic shielding shell 400 may be provided with a recess 431 at the upper end of the lateral surrounding portion 410, and a recess 432 may be provided on the lateral outer side of the lateral surrounding portion 410 to respectively receive a portion of the axial side surface portion 510 and a portion of the lateral side surface portion 520 of the cover 500. Figure 6B , the axial side surface portion 510 of the cover 500 is embedded in the range surrounded by the bevel portions 420 of the magnetic shielding housing 400, so that the axial side surfaces of the magnetic shielding housing 400 and the cover 500 are flush with each other, and the guide holes 425 on the bevel portions 420 are not covered by the axial side surface portion 510 of the cover 500. In addition, Figure 6B In the embodiment, the first bending portion 521 of the lateral side portion 520 of the cover 500 is used to abut against the edge of the circuit board hole that needs to be matched with the flat motor 1 , and the second bending portion 522 is used to fix the cover 500 on the magnetic shielding housing 400 .

[0104] Figure 6C The magnetic shield housing 400 and the cover 500 are shown in a cross-sectional view assembled with each other, and the magnet shaft assembly 200 is shown arranged in the inner space of the magnetic shield housing 400. Figure 6C The first lubricant groove 265 and the second lubricant groove 266 are described. For clarity, Figure 6C The circuit board 100 is not shown.

[0105] The first lubricant groove 265 is formed by the surface of the first section 251 of the support member 250 that faces the cover 500. Specifically, Figure 6C2 shows the first ring portion 261 and the second ring portion 262 of the first segment 251 of the support member 250. As described above, the first ring portion 261 and the second ring portion 262 are located on the circumferential outer side of the core 240, protrude in a direction away from the second segment 252, and are spaced apart from each other in the radial direction. The side surface of the first ring portion 261 slidably contacts the radial inner surface of the cover center hole 515 of the cover 500, and the top surface of the second ring portion 262 slidably contacts the axial inner surface of the cover 500. The first ring portion 261, the second ring portion 262, and the surface connecting the first ring portion 261 and the second ring portion 262 define a first lubricant groove 265. The first lubricant groove 265 is filled with lubricant, so that when the support member 250 and the cover 500 move relative to each other, the lubricant enters the gap between the side of the first ring portion 261 and the radial inner surface of the cover center hole 515, and the gap between the top surface of the second ring portion 262 and the axial inner surface of the cover 500 through capillary action, thereby providing lubrication for these gaps between the support member 250 and the cover 500.

[0106] Continue to refer Figure 6C The partition plate 440 of the magnetic shielding housing 400 is provided with a middle through hole 445 penetrating the partition plate 440 at the center position where the rotation axis A is located, and the second section 252 of the support member 250 passes through the middle through hole 445, and the second lubricant groove 266 is provided on the surface of the partition plate 440 facing the second section 252.

[0107] As mentioned above, the second section 252 of the support member 250 includes an annular step portion 263 located on the circumferential outer side of the core 240 and protruding radially. Figure 6C As shown, the spacer plate 440 is provided with a third ring portion 443 and a fourth ring portion 444 which are located on the circumferential outer side of the middle through hole 445, protrude toward the annular step portion 263 and are spaced apart from each other in the radial direction. The top surfaces of the third ring portion 443 and the fourth ring portion 444 are respectively in slidable contact with the surface of the annular step portion 263. The third ring portion 443, the fourth ring portion 444 and the surface connecting the third ring portion 443 and the fourth ring portion 444 define a second lubricant groove 266. The second lubricant groove 266 is filled with lubricant, so that when the support member 250 and the spacer plate 440 move relative to each other, the lubricant enters the gap between the top surfaces of the third ring portion 443 and the fourth ring portion 444 and the annular step portion 263 by capillary action. As shown Figure 6C As shown, there is also a small gap between the portion of the second section 252 of the support member 250 received in the middle through hole 445 of the spacer plate 440 and the inner wall of the middle through hole 445, and the lubricant in the second lubricant groove 266 can also reach the gap. Thus, the lubricant in the second lubricant groove 266 can provide lubrication for the gap between the support member 250 and the spacer plate 440.

[0108] In addition, if Figure 6C As shown, the first end 221 of the rotating shaft 220 of the magnet rotating shaft assembly 200 is accommodated in the cover center hole 515, and the second end 222 of the rotating shaft 220 is accommodated in the middle through hole 445 of the spacer plate 440. Therefore, the rotation of the magnet rotating shaft assembly 200 is stable. Since the first lubricant groove 265 and the second lubricant groove 266 can store lubricant, during the long-term use of the flat motor 1, the gap between the magnet rotating shaft assembly 200 and other fixed parts of the flat motor 1 can be continuously and effectively lubricated.

[0109] Figure 7 FIG. 2 shows a schematic diagram of the assembly of the moving part 300, the magnetic shielding shell 400 and the magnet shaft assembly 200 in the flat motor 1. Figure 7 As shown, the moving part 300 includes a main body 310 and a threaded column 315 and four guide columns 320 protruding from the main body 310 and extending in the direction of the rotation axis A. The threaded column 315 is configured to cooperate with the threaded hole of the magnet shaft assembly 200, and the four guide columns 320 are configured to be respectively received in the four guide holes 425 of the magnetic shielding shell 400. In other words, the positions of the threaded column 315 and the guide column 320 on the moving part 300 are respectively set to correspond to the threaded hole and the guide hole 425. Figure 7 In the embodiment, the main body 310 of the moving part 300 is configured as a plate, so that the flat motor 1 including the moving part 300 has an overall flat structure (see also Figure 1 ).

[0110] Fig. 8A The cross-sectional view shows the state of the moving part 300 in the flat motor 1 in the retracted position. In the retracted position, the threaded column 315 and the guide column 320 of the moving part 300 are fully received in the threaded hole of the magnet shaft assembly 200 and the guide hole 425 of the magnetic shielding case 400, respectively, and the main body 310 of the moving part 300 is closest to the axial side surface 510 of the cover 500. Figure 8B The cross-sectional view shows the moving part 300 in a partially extended position. In the partially extended position, the threaded column 315 and the guide column 320 of the moving part 300 are partially removed from the threaded hole and the guide hole 425, respectively, and the distance between the main body 310 of the moving part 300 and the axial side surface 510 of the cover 500 increases. Fig. 8A and Figure 8B Also shown is a circuit board 100 with a winding 130 (see also Fig. 9 ) and a control circuit board 120. Fig. 8A and Figure 8B As shown, the flat motor 1 has a compact internal structure.

[0111] Next, refer to Fig. 8A and 8B, further illustrating the working principle of the flat motor 1.

[0112] For example, the flat motor 1 is in Fig. 8A The retracted state shown. The control circuit board 120 causes the current in the winding 130 on the circuit board 100 to generate a dynamic magnetic field. The magnet 210 in the magnet shaft assembly 200 is driven by the dynamic magnetic field, causing the magnet shaft assembly 200 to rotate around the rotation axis A. On the other hand, due to the cooperation between the threaded column 315 of the moving part 300 and the threaded hole of the magnet shaft assembly 200 and the cooperation between the guide column 320 of the moving part 300 and the guide hole 425 of the magnetic shielding shell 400, the moving part 300 is driven to translate along the direction of the rotation axis A, thereby completing the driving process. It can be seen that the flat motor 1 can run smoothly, and it is suitable for use in scenes such as focusing lenses of electronic equipment that have high requirements on motor size and operating performance.

[0113] In addition, the flat motor 1 of the above arrangement also has a relatively simple assembly process. For example, after the circuit board 100 and the control circuit board 120 are respectively mounted on the magnetic shielding housing 400, lubricant can be applied to the second lubricant groove 266, and then the magnet shaft assembly 200 is arranged in the magnetic shielding housing 400, and lubricant is applied to the first lubricant groove 265, and then the cover 500 is mounted on the magnetic shielding housing 400. Thereafter, after the moving part 300 is arranged so that the threaded column 315 and the guide column 320 are respectively close to the orifices of the threaded hole and the guide hole 425, the rotation of the magnet shaft assembly 200 is started by the control circuit board 120, and the moving part 300 can be assembled with the magnet shaft assembly 200 and the magnetic shielding housing 400 according to the above principle.

[0114] The exemplary implementation of the flat motor proposed in the present invention is described in detail above with reference to the preferred embodiments. However, those skilled in the art will appreciate that, without departing from the concept of the present invention, various modifications and alterations may be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention may be combined in various ways without exceeding the protection scope of the present invention.

Claims

1. A flat motor, characterized in that: include: A winding (130) disposed on a circuit board (100); A magnet shaft assembly (200) comprises a magnet (210) and a shaft (220) fixed relative to the magnet (210), wherein the magnet (210) has a flat shape and is adjacent to the winding (130), the magnet shaft assembly (200) can rotate around a rotation axis (A) under the drive of the winding (130), and the shaft (220) is provided with a threaded portion (225) along the rotation axis (A); A moving component (300) cooperates with the threaded portion (225); A magnetic shielding shell (400) is fixed relative to the circuit board (100), and the magnetic shielding shell (400) has a guide hole (425) extending in the direction of the rotation axis (A) and cooperating with the moving part (300), so that the magnet shaft assembly (200) can only drive the moving part (300) to move along the rotation axis (A).

2. The flat motor according to claim 1, characterized in that: The moving member (300) includes a main body (310) and a plurality of guide posts (320) protruding from the main body (310) and extending along the rotation axis (A). The magnetic shielding shell (400) is disposed radially outside the magnet shaft assembly (200) and has a plurality of guide holes (425) extending in the direction of the rotation axis (A) to receive and guide the plurality of guide posts (320) therein.

3. The flat motor according to claim 2, characterized in that: The motor (1) further comprises a cover (500), wherein the cover (500) separates the main body (310) of the moving component (300) from the winding (130) and the magnet shaft assembly (200), and the cover (500) comprises a cover center hole (515), and the threaded portion (225) of the shaft (220) cooperates with the moving component (300) through the cover center hole (515).

4. The flat motor according to claim 3, characterized in that: The magnetic shielding shell (400) and the cover together form a complete motor housing (450), wherein the magnetic shielding shell (400) includes recessed portions (431, 432) for being assembled with the cover (500).

5. The flat motor according to claim 4, characterized in that: The dimension of the motor housing (450) along the rotation axis (A) is smaller than the dimension perpendicular to the rotation axis (A), thereby forming an overall flat shape, and the axial side surfaces of the magnetic shielding shell (400) and the cover (500) are flush with each other, and / or The magnetic shielding case (400) has a polygonal shape in a plane perpendicular to the rotation axis (A), and the guide hole (425) is provided at an oblique angle portion (420) of the polygon. The magnetic shielding shell (400) is made of magnetic shielding material, and / or the cover (500) is made of metal.

6. The flat motor according to claim 4, characterized in that: The cover (500) comprises an axial side surface portion (510) and a lateral side surface portion (520), wherein the axial side surface portion (510) extends perpendicularly to the rotation axis (A), and the lateral side surface portion (520) extends radially outwardly of the axial side surface portion (510) and parallel to the rotation axis (A). The end of the lateral side portion (520) is provided with a first bent portion (521) extending radially outward, and the first bent portion (521) is configured to abut against an edge of a hole in a circuit board to be matched, and / or The end of the lateral side portion (520) of the cover (500) is also provided with a second bent portion (522) extending radially inward, and the second bent portion (522) fixes the cover (500) on the magnetic shielding shell (400).

7. The flat motor according to claim 3, characterized in that: The rotating shaft (220) of the magnet rotating shaft assembly (200) comprises a first end (221) and a second end (222) opposite to the first end (221), and the central hole (515) of the cover is configured to accommodate the first end (221), and / or The magnetic shielding shell (400) further includes a spacer plate (440) disposed opposite to the cover (500), wherein the spacer plate (440) is provided with a middle through hole at the position of the rotation axis (A), and the middle through hole is configured to accommodate the second end portion (222).

8. The flat motor according to claim 2, characterized in that: The threaded portion (225) of the rotating shaft (220) is a threaded hole extending along the rotation axis (A), and the moving component (300) further includes a threaded column (315) protruding from the main body (310) and extending along the rotation axis (A), and the threaded column (315) is configured to cooperate with the threaded hole.

9. The flat motor according to claim 4, characterized in that: The magnet shaft assembly (200) further comprises a magnet cover plate (230) fixed to the magnet (210), wherein the magnet cover plate (230) is made of a material capable of shielding magnetic field radiation, and the magnet cover plate (230) covers the magnet (210). The rotating shaft (220) of the magnet rotating shaft assembly (200) comprises a core (240) and a support member (250), wherein the core (240) passes through a central through hole (235) of the magnet cover plate (230), and the support member (250) is integrally formed between the core (240) and the magnet cover plate (230) by molding to fix the core (240) and the magnet cover plate (230) to each other, and the threaded portion (225) is arranged in the core (240).

10. The flat motor according to claim 9, characterized in that: The support member (250) includes a first section (251) that is closer to the cover (500) relative to the magnet cover plate (230), a second section (252) that is farther away from the cover (500) relative to the magnet cover plate (230), and a connecting section (253) between the first section (251) and the second section (252).

11. The flat motor according to claim 10, characterized in that: The first section (251) of the support member (250) is provided with a first lubricant groove (265) for storing lubricant on the surface facing the cover (500), and the first lubricant groove (265) is filled with lubricant to provide lubrication to the gap between the support member (250) and the cover (500) through capillary action when the support member (250) and the cover (500) move relative to each other.

12. The flat motor according to claim 11, characterized in that: The first section (251) of the support member (250) includes a first ring portion (261) and a second ring portion (262) which are located on the circumferential outer side of the core portion (240), protrude in a direction away from the second section (252) and are spaced apart from each other in a radial direction, the side surface of the first ring portion (261) being slidably in contact with the radial inner surface of the cover center hole (515), the top surface of the second ring portion (262) being slidably in contact with the axial inner surface of the cover (500), and the first ring portion (261), the second ring portion (262) and the surface connecting the first ring portion (261) and the second ring portion (262) defining the first lubricant groove (265).

13. The flat motor according to claim 10, characterized in that: The magnetic shielding shell (400) also includes a spacer plate (440) arranged opposite to the cover (500), the spacer plate (440) including a middle through hole (445), and the second section (252) of the support member (250) passes through the middle through hole (445), and the spacer plate (440) is provided with a second lubricant groove (266) for storing lubricant on the surface facing the second section (252), and the second lubricant groove (266) is filled with lubricant to provide lubrication to the gap between the support member (250) and the spacer plate (440) through capillary action when the support member (250) and the spacer plate (440) move relative to each other.

14. The flat motor according to claim 13, characterized in that: The second section (252) of the support member (250) includes an annular step portion (263) located on the circumferential outer side of the core portion (240) and protruding radially, and the spacer plate (440) is provided with a third ring portion (443) and a fourth ring portion (444) located on the circumferential outer side of the middle through hole (445) of the spacer plate, protruding toward the annular step portion (263) and spaced apart from each other in the radial direction, and the top surfaces of the third ring portion (443) and the fourth ring portion (444) respectively slidably contact the surface of the annular step portion (263), and the third ring portion (443), the fourth ring portion (444) and the surface connecting the third ring portion (443) and the fourth ring portion (444) define the second lubricant groove (266).

15. The flat motor according to claim 10, characterized in that: The central through hole (235) of the magnet cover plate (230) has a non-cylindrical radial inner surface (236), the connecting section (253) of the support member (250) has a radial outer surface matching the radial inner surface, and / or The magnet cover plate (230) is also provided with a plurality of auxiliary through holes (238) circumferentially around the central through hole (235), and / or The outer surface of the core (240) is provided with an annular groove (245) extending around the rotation axis (A), and a portion of the support member (250) is insert-molded on the annular groove (245).

Images