Outer rotor motor assembly and electronic device

Abstract

The application provides an outer rotor motor assembly and an electronic device. The outer rotor motor assembly comprises a limiting piece and two horizontally arranged outer rotor motors. Each outer rotor motor comprises a stator and an eccentric mover. The stator comprises an iron core and a coil sleeved on the iron core. The eccentric mover comprises a magnetic piece. The magnetic piece is arranged on the periphery of the iron core. The limiting piece is used to limit the rotation angle of each eccentric mover. The outer rotor motor assembly comprises two horizontal outer rotor motors. Each outer rotor motor comprises an eccentric mover. The center of mass of the eccentric mover is not on the rotation center. The acceleration generated by the two eccentric movers during rotation and when the limiting piece stops is asymmetrically distributed. The effect is that the outer rotor motor assembly generates asymmetric vibration during operation.

Description

Technical Field

[0001] This invention relates to the field of external rotor motor assembly technology, and more particularly to an external rotor motor assembly and electronic device. Background Technology

[0002] Vibratory motors are widely used in various industries. They are devices that convert electrical energy into mechanical energy. Most existing vibratory motors are linear motors with eccentric movers. When they reciprocate near the equilibrium position, the vibrations they produce are symmetrically distributed and cannot produce asymmetrical vibrations (anisotropic vibrations).

[0003] Therefore, it is necessary to provide a new external rotor motor assembly and electronic equipment to solve or at least alleviate the above-mentioned technical defects. Summary of the Invention

[0004] The main objective of this invention is to provide an external rotor motor assembly and electronic device, which aims to solve the technical problem that motors in the prior art cannot provide anisotropic vibration.

[0005] To achieve the above objectives, according to one aspect of the present invention, an external rotor motor assembly is provided, comprising an iron core and a coil sleeved on the iron core, wherein the eccentric mover includes a magnetic element disposed around the iron core, and the limiting member is used to limit the rotation angle of each of the eccentric movers.

[0006] In one embodiment, the magnetic component includes a magnetic ring and a mass block, the magnetic ring being disposed around the periphery of the iron core, and the mass block being non-uniformly distributed along the periphery of the magnetic ring.

[0007] In one embodiment, the number of mass blocks is one, and one mass block partially surrounds the periphery of the magnetic ring.

[0008] In one embodiment, the eccentric mover further includes a magnetic ring, which is connected to the magnetic element and surrounds the periphery of the magnetic element, and the mass block is connected to the magnetic element or the magnetic ring.

[0009] In one embodiment, the eccentric mover further includes a limiting bracket, which is at least partially disposed around the outer periphery of the magnetic element. The limiting element is used to abut against the two limiting brackets to limit the rotation angle of each of the eccentric movers.

[0010] In one embodiment, the limiting bracket includes a limiting body and limiting protrusions respectively disposed at both ends of the limiting body. The limiting body partially surrounds the outer periphery of the magnetic element and the magnetic ring. One end of the limiting protrusion is used to connect with the magnetic element or the magnetic ring, and the other end of the limiting protrusion extends out of the magnetic ring and is used to abut against the limiting member to limit the rotation angle of the eccentric mover. The mass block is connected to the position of the magnetic element surrounded by the limiting body.

[0011] In one embodiment, the eccentric mover's rotation and reverse rotation angles are both within the range of 0° to 90°; the two external rotor motors rotate in opposite directions, and the two external rotor motors collide with the limiting member simultaneously.

[0012] In one embodiment, the surface of the limiting member is provided with a buffer.

[0013] In one embodiment, the iron core includes a plurality of uniformly distributed sub-cores, and the number of coils is the same as the number of sub-cores and is fitted onto the sub-cores in a one-to-one correspondence.

[0014] According to another aspect of the present invention, the present invention also provides an electronic device comprising a housing and an external rotor motor assembly as described above disposed within the housing.

[0015] In the above scheme, the external rotor motor assembly includes an iron core and a coil sleeved on the iron core. The eccentric mover includes a magnetic component, which is located around the iron core. A limiting component is used to limit the rotation angle of each eccentric mover. The stator of the external rotor motor includes an iron core and a coil sleeved on the iron core. The eccentric mover is arranged around the stator, unlike traditional motors where the stator is located inside and the eccentric mover is located outside. The eccentric mover includes a magnetic component surrounding the iron core but not connected to it. First, the magnetic component is magnetized, and then the coil is energized. According to Ampere's law, the coil will experience torque. Since the coil is stationary, it will simultaneously exert a reaction force on the magnetic component, causing the magnetic component to rotate, which in turn drives the eccentric mover to rotate. Because the eccentric mover has a mass block, the mass distribution of the eccentric mover is not uniform. Therefore, the center of mass of the eccentric mover and its rotation center are not at the same point, which can generate vibration during rotation. This invention employs two horizontally positioned external rotor motors, each including an eccentric mover. The center of mass of the eccentric mover is not located at the center of rotation. The acceleration generated by the two eccentric movers during rotation and when they stop against a limiting element is asymmetrically distributed, resulting in asymmetrical vibration of the external rotor motor assembly during operation. Furthermore, due to the eccentric structure of the eccentric mover, it inherently generates vibration during rotation. Simultaneously, by using two horizontally placed external rotor motors, asymmetrical vibration can be generated during operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the external rotor motor assembly according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the external rotor motor assembly (hidden coil assembly) according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the external rotor motor according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the limiting member according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the rotation of the external rotor motor assembly according to an embodiment of the present invention;

[0022] Figure 6 for Figure 5 A schematic diagram of the resultant force acting on the external rotor motor assembly under the specified conditions;

[0023] Figure 7 This is a schematic diagram of the braking of the external rotor motor assembly according to an embodiment of the present invention;

[0024] Figure 8 for Figure 7 A schematic diagram of the resultant force acting on the external rotor motor assembly under the specified conditions;

[0025] Figure 9 This is a schematic diagram of the external rotor motor assembly rotating in reverse according to an embodiment of the present invention;

[0026] Figure 10 for Figure 9 A schematic diagram of the resultant force acting on the external rotor motor assembly under the specified conditions;

[0027] Figure 11 This is a schematic diagram of the reverse braking of the external rotor motor assembly according to an embodiment of the present invention;

[0028] Figure 12 for Figure 11 A schematic diagram of the resultant force acting on the external rotor motor assembly under the specified conditions;

[0029] Figure 13 The waveforms of the input voltage signal and acceleration signal when the external rotor motor assembly rotates according to an embodiment of the present invention are shown.

[0030] Label Explanation:

[0031] 100. External rotor motor assembly; 10. External rotor motor; 1. Eccentric mover; 11. Magnetic ring; 12. Magnetic component; 13. Mass block; 14. Limiting bracket; 141. Limiting body; 142. Limiting extension; 2. Stator; 21. Iron core; 22. Coil; 23. Rotation center; 3. Housing; 4. Limiting component; 41. First limiting surface; 42. Second limiting surface; 43. Arc surface.

[0032] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0036] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0037] Reference Figures 1-4According to one aspect of the present invention, an external rotor motor assembly 100 is provided, including a limiting member 4 and two horizontally arranged external rotor motors 10. Each external rotor motor 10 includes a stator 2 and an eccentric mover 1. The stator 2 includes an iron core 21 and a coil 22 sleeved on the iron core 21. The eccentric mover 1 includes a mass block 13, which is disposed around a magnetic member 12. The limiting member 4 is used to limit the rotation angle of each eccentric mover 1.

[0038] The stator 2 of the external rotor motor 10 includes an iron core 21 and a coil 22 sleeved on the iron core 21. An eccentric mover 1 is arranged around the stator 2. Unlike traditional motors, the stator 2 is located inside the stator, and the eccentric mover 1 is located outside. The eccentric mover 1 includes a magnetic element 12 surrounding the iron core 21 but not connected to it. First, the magnetic element 12 is magnetized, and then the coil 22 is energized. According to Ampere's law, the coil 22 experiences torque. Since the coil 22 is stationary, it simultaneously exerts a reaction torque on the magnetic element 12, driving the magnetic element 12 to rotate, which in turn drives the eccentric mover 1 to rotate. The rotation center 23 of the eccentric mover 1 can be the center of the iron core 21. Because the mass distribution of the eccentric mover 1 is not uniform, the center of mass of the eccentric mover 1 and its rotation center 23 are not at the same point, which can generate vibration during rotation. The limiting member 4 is used to abut against the two eccentric movers 1 to limit the rotation angle of each eccentric mover 1. This embodiment uses two horizontally positioned external rotor motors 10, each including an eccentric mover 1. The center of mass of the eccentric mover 1 is not located at the rotation center 23. The acceleration generated by the two eccentric movers 1 during rotation and when they stop upon contacting the limiting member 4 is asymmetrically distributed, resulting in asymmetrical vibration of the external rotor motor assembly 100 during operation. Furthermore, because the eccentric mover 1 is an eccentric structure, it inherently vibrates during rotation. By using two horizontally placed external rotor motors 10, asymmetrical vibration can be generated during operation.

[0039] Reference Figures 1-3In one embodiment, the magnetic component 12 includes a magnetic ring and a mass block 13. The magnetic ring is disposed around the periphery of the iron core, and the mass block 13 is non-uniformly distributed along the periphery of the magnetic ring. The magnetic ring is a circular magnetic component 12 arranged around the periphery of the iron core 21. The periphery of the magnetic ring refers to the side of the magnetic ring away from the iron core 21. Placing the mass block 13 on the periphery of the magnetic ring serves three purposes: first, it increases the eccentricity effect and enhances the vibration; second, it prevents interference with the internal stator 2; and third, it allows for limiting the movement of the mass block 13 by colliding with the limiting component 4. Therefore, the two external rotor motors 10 can share a single limiting component 4, requiring only one limiting component 4. The non-uniform distribution of the mass block 13 along the periphery of the magnetic ring means that the center of the mass block 13 does not coincide with the rotation center 23 of the eccentric mover 1. The eccentricity of the mover is achieved by the arrangement of the mass block 13. Here, the rotation center 23 of the eccentric mover 1 can be the center of the iron core 21, which is the center of the magnetic ring. Specifically, the magnetic component 12 can be a permanent magnet, while the mass component is generally made of a high-density material, such as lead or tungsten alloy. The density of the mass component is much greater than that of the permanent magnet, and its size is also set to be larger than that of the permanent magnet. The presence of a mass component increases the vibration sensation. Specifically, the non-uniform distribution of the mass block 13 around the magnetic ring can include the following two specific embodiments:

[0040] Reference Figure 3 In the first specific embodiment, the number of mass blocks 13 is one. One mass block 13 is not a complete circle, so the mass distribution of the eccentric mover 1 is uneven. The eccentric effect is generated by the position setting of the mass block 13, and the rotation center 23 of the eccentric mover 1 does not coincide with the center of mass of the eccentric mover 1.

[0041] In a second specific embodiment, there are multiple mass blocks 13, which are non-uniformly distributed along the periphery of the magnetic ring. When the mass blocks 13 are of the same size and mass, if the mass blocks 13 are uniformly distributed along the outer periphery of the magnetic ring, the rotation center 23 of the eccentric mover 1 will coincide with the center of mass of the eccentric mover 1, failing to produce a satisfactory vibration. Therefore, multiple mass blocks 13 are non-uniformly distributed along the outer periphery of the magnetic ring.

[0042] Of course, in another embodiment, the mass and size of each mass block 13 may also be different. In this case, even if the mass blocks 13 are evenly distributed, the rotation center 23 of the eccentric mover 1 will not coincide with the center of mass of the eccentric mover 1, and the eccentric mover 1 will still produce a vibration when it rotates.

[0043] Reference Figure 2 and Figure 3In one embodiment, the eccentric mover 1 further includes a magnetic ring 11, which is connected to and surrounds the magnetic element 12. A mass block 13 is connected to the magnetic element 12 or the magnetic ring 11. The mass block 13 is connected to the eccentric mover 1 via the magnetic ring 11 or the magnetic element 12. The magnetic ring 22, also known as a magnetic yoke, is a yoke made of stacked silicon steel sheets. It is evenly and symmetrically distributed around the coil assembly to constrain the outward diffusion of leakage magnetic flux.

[0044] Reference Figures 1-3 In one embodiment, the eccentric rotor 1 further includes a limiting bracket 14, which at least partially surrounds the outer periphery of the magnetic element 12. The limiting element 4 abuts against the two limiting brackets 14 to limit the rotation angle of each eccentric rotor 1. It should be noted that without the limiting brackets 14, the rotation angle of the eccentric rotor can be limited by the contact between the mass block 13 and the limiting element 4. However, since the mass block 13 has a large mass and inertia, repeated collisions can easily damage the limiting element 4 and the mass block 13. Therefore, a limiting bracket 14, fitted around the outer periphery of the magnetic element 12 or the magnetic ring 11, is used to abut against the limiting element 4 to limit the rotation angle of the eccentric rotor 1.

[0045] Reference Figures 1-3 In one embodiment, the limiting bracket 14 includes a limiting body 141 and limiting protrusions 142 respectively disposed at both ends of the limiting body 141. The limiting body 141 partially surrounds the outer periphery of the magnetic element 12 and the magnetic ring 11. One end of the limiting protrusion 142 is used to connect with the magnetic element 12, and the other end of the limiting protrusion 142 extends out of the magnetic ring 11 and is used to abut against the limiting element 4 to limit the rotation angle of the eccentric mover 1. The mass block 13 is connected to the position of the magnetic element 12 surrounded by the limiting body 141. The shape of the limiting body 141 can be adapted to the outer periphery of the magnetic ring 11, and is also arc-shaped. It can be fitted around the periphery of the magnetic ring 11 along the extension direction of the magnetic ring 11. One end of the limiting protrusion 142 can be connected to the magnetic element 12 or the magnetic ring 11, and the other end extends out of the magnetic ring 11 for abutting against the limiting member 4. There are two limiting protrusions 142, which are used to abut against the limiting member 4 to limit the rotation angle of the eccentric rotor when the eccentric rotor 1 rotates and rotates in the opposite direction. In addition, when the limiting bracket 14 is provided to limit the rotation angle of the eccentric rotor, the mass block 13 can be placed in the part of the magnetic element 12 or the magnetic ring 11 surrounded by the limiting body 141 and located between the two limiting protrusions 142 to avoid the mass block 13 colliding with the limiting member 4.

[0046] Reference Figure 4In one embodiment, the limiting member 4 includes a first limiting surface 41, two second limiting surfaces 42, and two arc surfaces 43. The two second limiting surfaces 42 are respectively connected to the first limiting surface 41 through the two arc surfaces 43. The shape of the arc surface 43 is adapted to the shape of the magnetic ring 11, and the magnetic ring 11 is positioned close to the arc surface 43. The first limiting surface 41 and the second limiting surface 42 are respectively used to abut against the two limiting protrusions 142 to limit the rotation angle of the eccentric mover 1. With the perpendicular bisector of the line connecting the rotation centers 23 of the two eccentric movers 1 as the line of symmetry, the two second limiting surfaces 42 are mirror images of the line of symmetry, and the two arc surfaces 43 are also mirror images of the line of symmetry. This refers to the case where there is only one limiting component 4. In this case, there is one first limiting surface 41, and two second limiting surfaces 42 and two arc surfaces 43. The first limiting surface 41 can simultaneously abut against two first contact surfaces to limit the rotation angle of the eccentric rotor. The two second limiting surfaces 42 abut against the second contact surfaces of the two eccentric rotors respectively to limit the rotation angle of the eccentric rotor. That is, the first limiting surface 41 and the second limiting surface 42 can be used to limit the rotation angle and the reverse rotation angle of the eccentric rotor, respectively. The rotation center 23 of the eccentric mover 1 is also the rotation center of the eccentric rotor, or it can be the center of the iron core 21. Connecting the rotation centers 23 of the two eccentric movers 1 forms a line segment, which is the line connecting the rotation centers 23 of the eccentric movers 1. The perpendicular bisector of this line segment is the line of symmetry. The line of symmetry is as follows: Figure 5 or Figure 7 As shown by the dashed line H, the two second limiting surfaces 42 are mirror images of the line of symmetry, and the two arc surfaces 43 are mirror images of the line of symmetry. This design uses identical structures to ensure that both eccentric rotors collide with the limiting component 4 simultaneously, and also to ensure that when the two eccentric rotors rotate and simultaneously collide with the limiting component 4, reference... Figure 8 and Figure 12 Upon collision, the centrifugal force disappears, leaving only the component in the y-direction, i.e., the braking force F2. The design of the arc surface 43 facilitates the insertion of the magnetic ring 11 into the arc surface 43, allowing it to rotate within the concave surface formed by the arc surface 43.

[0047] Reference Figure 4 In one embodiment, both second limiting surfaces 42 are perpendicular to the first limiting surface 41. The limiting body 141 is a semi-circular ring. The center of the arc surface 43, the center of the limiting body 141, and the rotation center 23 of the eccentric rotor 1 are concentrically arranged. The central angle of the arc surface 43 is 90°, and the central angle of the limiting body 141 is 180°. The difference between the central angles of the limiting body 141 and the arc surface 43 is 90°. This can limit the angle range of rotation and reverse rotation of the eccentric rotor to 0° to 90°, which is beneficial for generating asymmetric vibration.

[0048] In one embodiment, there are two limiting members 4, each corresponding to one of the two eccentric rotors 1. Each limiting member 4 abuts against the corresponding eccentric rotor to limit the rotation angle of the eccentric rotor. Alternatively, in this embodiment, there can also be two limiting members 4, each corresponding to one eccentric rotor 1 to limit the rotation angle of the corresponding eccentric rotor 1. The eccentric rotor 1 collides or abuts against its corresponding limiting member 4. This design, compared to involving only one limiting member 4, ensures that the movements of the two eccentric rotors 1 do not affect each other. When two eccentric rotors 1 collide with a limiting member 4 simultaneously, the vibration generated by one eccentric rotor 1 will not affect the other eccentric rotor 1.

[0049] In one embodiment, each limiting member 4 includes a first limiting surface 41, a second limiting surface 42, and an arc surface 43 connecting the first limiting surface 41 and the second limiting surface 42. The first limiting surface 41 and the second limiting surface 42 are respectively used to abut against the two limiting protrusions 142 to limit the rotation angle of the eccentric mover 1. With the perpendicular bisector of the line connecting the rotation centers 23 of the two eccentric movers 1 as the line of symmetry, the two limiting members 4 are arranged in a mirror image with respect to the line of symmetry. This refers to the case where there are two limiting members 4. Each limiting member 4 includes a first limiting surface 41, a second limiting surface 42, and an arc surface 43. The first limiting surface 41 and the second limiting surface 42 of one limiting member 4 can respectively abut against the first contact surface and the second contact surface of one eccentric mover 1, limiting the rotation angle of one eccentric mover 1. The first limiting surface 41 and the second limiting surface 42 of the other limiting member 4 can respectively abut against the first contact surface and the second contact surface of another eccentric mover 1, limiting the rotation angle of the other eccentric mover 1 and its reverse rotation. The rotation center 23 of the eccentric mover 1 is also the rotation center of the eccentric mover 1. Connecting the rotation centers 23 of the two eccentric movers 1 forms a line segment, which is the line connecting the rotation centers 23 of the eccentric movers 1. The perpendicular bisector of this line segment is taken as the line of symmetry. The two limiting members 4 are set in a mirror image with respect to the line of symmetry. This design ensures that both eccentric movers 1 collide with the limiting members 4 simultaneously, and also ensures that when both eccentric movers 1 collide with the limiting members 4 at the same time, the reference... Figure 8 and Figure 12 Upon collision, the centrifugal force disappears, leaving only the component in the y-direction, which is the braking force F2.

[0050] In one embodiment, the first limiting surface 41 and the second limiting surface 42 are arranged perpendicularly, the limiting body 141 is a semi-circular ring, the center of the arc surface 43, the center of the limiting body 141 and the rotation center 23 of the eccentric mover 1 coincide, the central angle of the arc surface 43 is 90° and the central angle of the limiting body 141 is 180°. This can limit the angle range of rotation and reverse rotation of the eccentric mover 1 to 0° to 90°, which is beneficial to generating asymmetric vibration.

[0051] In one embodiment, the eccentric mover 1 rotates within a range of 0° to 90° in both directions. The two outer rotor motors 10 rotate in opposite directions, and both outer rotor motors 10 collide with the limiting member 4 simultaneously. Here, the maximum rotation angle of the eccentric mover 1 is 90°. After rotating 90° and colliding with the limiting member 4, it can rotate 90° in the opposite direction to collide with the limiting member 4 again. The two outer rotor motors 10 have identical structures, equal rotational speeds and torques, but opposite rotational directions. Opposite rotational directions mean that one outer rotor motor 10 rotates clockwise while the other rotates counterclockwise; both outer rotor motors 10 will not rotate clockwise or counterclockwise simultaneously. Furthermore, the collisions of both outer rotor motors 10 with their corresponding limiting members 4 occur at the same time, with the collision forces generated simultaneously. Figure 8 and Figure 12 Upon collision, the centrifugal force disappears, leaving only the component in the y-direction, which is the braking force F2.

[0052] In one embodiment, a buffer element, which is a rubber layer or a foam layer, is provided on the surface of the limiting member 4. The buffer element is disposed on the contact surface of the limiting member 4 for abutting against the eccentric mover 1. The limiting member 4 can be made of metal material to improve strength and provide support, while the buffer element is used to reduce noise and buffer impact force to prevent damage. Specifically, the buffer element can be made of foam or rubber material.

[0053] In one embodiment, the iron core 21 includes a plurality of uniformly distributed sub-cores, and the number of coils 22 is the same as the number of sub-cores, with each coil 22 corresponding to and fitted onto a sub-core. Specifically, there can be three sub-cores, which are evenly spaced apart. Each coil 22 forms an inner circle, and each sub-core passes through the inner circle of a coil 22 so that the coil 22 is fitted onto the sub-core. Alternatively, a coil frame can be provided, fitted onto the sub-cores, and the coils 22 can be wound around the coil frame.

[0054] In one embodiment, the external rotor motor assembly 100 further includes a housing 3, within which the external rotor motor 10 is disposed. The housing 3 has mounting holes for mounting the limiting member 4. The housing 3 may include an upper housing and a lower housing. The upper housing has an upper through hole for mounting the limiting member 4, and the lower housing has a lower through hole for mounting the limiting member 4. The upper and lower through holes are directly opposite each other, and the limiting member 4 can be mounted on the upper and lower through holes by snap-fit. The coil assembly may consist only of a coil 22 fixed to the housing 3, or it may include a coil frame and a coil 22 wound on the coil frame, with the coil frame mounted on the housing 3 to provide support for the winding of the coil 22.

[0055] To clearly describe the implementation of the present invention, the technical solution and beneficial effects of the present invention are now explained in conjunction with the accompanying drawings:

[0056] In one specific embodiment, the external rotor motor assembly 100 includes a limiting member 4 and two horizontally arranged external rotor motors 10. Each external rotor motor 10 includes a stator 2 and an eccentric mover 1. The stator 2 includes an iron core 21 and a coil 22 sleeved on the iron core 21. The eccentric mover 1 includes a magnetic element 12, a magnetic ring 11, a limiting bracket 14, and a mass block 13. The magnetic element 12 is disposed around the iron core 21, and the magnetic ring 11 is connected to the magnetic element 12 and surrounds the magnetic element 12. Both the magnetic ring 11 and the magnetic element 12 are circular. The mass block... The mass block 13 is connected to the magnetic component 12 or the magnetic ring 11. The limiting bracket 14 includes a limiting body 141 and limiting protrusions 142 respectively disposed at both ends of the limiting body 141. The limiting body 141 partially surrounds the outer periphery of the magnetic component 12 and the magnetic ring 11. One end of the limiting protrusion 142 is used to connect with the magnetic component 12, and the other end of the limiting protrusion 142 extends out of the magnetic ring 11 and is used to abut against the limiting member 4 to limit the rotation angle of the eccentric mover 1. The mass block 13 is connected to the magnetic component 12 at the position surrounded by the limiting body 141. The limiting body 141 is a semi-circular ring, and the limiting member 4 is used to abut against the two eccentric movers 1 to limit the rotation angle of each eccentric mover 1.

[0057] Reference Figures 5-12 Where F1 represents centrifugal force, F2 represents braking force, and F_net represents the resultant force on the external rotor motor assembly 100. Figure 6 and Figure 10 In the diagram, the direction of the thick arrow indicates the torque force exerted by the eccentric mover 1 on the housing of the turntable motor assembly 100. It should be noted that the mass component generally has a large mass; therefore, the center of mass is assumed to be located close to the mass component, and the point of force application is selected on the mass component when analyzing the force. Specifically:

[0058] Reference Figure 5 and Figure 6 , Figure 5 The outer rotor motor 10 on the left rotates counterclockwise, while the outer rotor motor 10 on the right rotates clockwise. Figure 6 This diagram illustrates the resultant force acting on the outer rotor motor assembly 100 during rotation. After rotation begins, the x-components of the torque and centrifugal force of the two eccentric movers 1 are equal in magnitude and opposite in direction, canceling each other out, leaving only the y-component of the centrifugal force.

[0059] Reference Figure 7 and Figure 8 , Figure 7 This indicates that after the eccentric wheel 11 rotates 90°, it brakes and collides with the limiting member 45. Figure 8 This diagram illustrates the resultant force acting on the outer rotor motor assembly 100 when a collision occurs. At this moment, the centrifugal force disappears, leaving only the braking force F2, and the resulting resultant force F is the braking force in the -y direction.

[0060] Reference Figure 9 and Figure 10 , Figure 9 This diagram illustrates the reverse rotation of the eccentric wheel 11 after braking. The left outer rotor motor 10 rotates clockwise, while the right outer rotor motor 10 rotates counter-clockwise. Figure 10 This diagram illustrates the resultant force acting on the counter-rotating external rotor motor assembly 100. At this point, the x-components of the torques and centrifugal forces of the two eccentric movers 1 cancel each other out, leaving the y-component.

[0061] Reference Figure 11 and Figure 12 , Figure 11 This indicates that after the eccentric wheel 11 brakes, it rotates 90° in the opposite direction and returns to its initial position, during which it brakes and collides with the limiting member 45. Figure 12 This diagram illustrates the resultant force acting on the outer rotor motor assembly 100 when braking occurs during reverse rotation. At this time, the centrifugal force of the eccentric mover 1 of the two outer rotor motors 10 disappears, leaving only the braking force F2. The braking forces F2 of the two outer rotor motors 10 cancel each other out.

[0062] Because it is an eccentric mover 11, the vibration generated during rotation and braking is asymmetrical. See [reference needed] for details. Figure 13 , Figure 13 The A-curve represents the electrical signal input to the motor. Figure 13 The B-curve represents the acceleration signal collected from the external rotor motor assembly 100 by the accelerometer. The horizontal axis represents time, the left vertical axis represents the input voltage, and the right vertical axis represents the acceleration magnitude. It can be seen that the absolute values ​​of the electrical signals input to the motor are basically the same, but the acceleration values ​​of the external rotor motor assembly 100 are different, and the waveform of the acceleration signal exhibits an asymmetrical distribution. Therefore, it can be said that the external rotor motor assembly 100 produces asymmetrical vibration.

[0063] According to another aspect of the present invention, the present invention also provides an electronic device, which includes a housing and an external rotor motor assembly 100 as described above disposed within the housing. Since the electronic device incorporates all the technical solutions of all embodiments of the external rotor motor assembly 100 described above, it possesses all the beneficial effects brought by all the above-described technical solutions, which will not be elaborated upon here. The above-described electronic device may be a mobile phone or a game controller, etc.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the patent scope of this invention. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that, under the technical concept of this invention, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; or they can be directly / indirectly applied to other related technical fields. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An external rotor motor assembly, characterized in that, The device includes a limiting member and two horizontally arranged external rotor motors. Each external rotor motor includes a stator and an eccentric mover. The stator includes an iron core and a coil sleeved on the iron core. The eccentric mover includes a magnetic element disposed around the iron core. The limiting member is used to limit the rotation angle of each eccentric mover. The rotation angle range of the eccentric mover in both the rotation and reverse rotation directions is 0° to 90°. The two external rotor motors rotate in opposite directions, and both external rotor motors collide with the limiting member simultaneously.

2. The external rotor motor assembly according to claim 1, characterized in that, The magnetic component includes a magnetic ring and a mass block. The magnetic ring is disposed around the iron core, and the mass block is non-uniformly distributed around the periphery of the magnetic ring.

3. The external rotor motor assembly according to claim 2, characterized in that, The mass block is one piece, and one mass block partially surrounds the periphery of the magnetic ring.

4. The external rotor motor assembly according to claim 2, characterized in that, The eccentric mover also includes a magnetic ring, which is connected to the magnetic component and surrounds the magnetic component. The mass block is connected to the magnetic component or the magnetic ring.

5. The external rotor motor assembly according to claim 4, characterized in that, The eccentric mover also includes a limiting bracket, which is at least partially surrounding the outer periphery of the magnetic element. The limiting element is used to abut against the two limiting brackets to limit the rotation angle of each eccentric mover.

6. The external rotor motor assembly according to claim 5, characterized in that, The limiting bracket includes a limiting body and limiting protrusions respectively disposed at both ends of the limiting body. The limiting body partially surrounds the outer periphery of the magnetic component and the magnetic ring. One end of the limiting protrusion is used to connect with the magnetic component or the magnetic ring, and the other end of the limiting protrusion extends out of the magnetic ring and is used to abut against the limiting component to limit the rotation angle of the eccentric mover. The mass block is connected to the position of the magnetic component surrounded by the limiting body.

7. The external rotor motor assembly according to any one of claims 1 to 6, characterized in that, The surface of the limiting member is provided with a buffer.

8. The external rotor motor assembly according to any one of claims 1 to 6, characterized in that, The iron core includes a plurality of evenly distributed sub-cores, and the number of coils is the same as the number of sub-cores and they are fitted one-to-one on the sub-cores.

9. An electronic device, characterized in that, The electronic device includes a housing and an external rotor motor assembly as described in any one of claims 1 to 8 disposed within the housing.

Images