Rotor assembly, sound wave vibration motor and electric cleaning equipment

Abstract

The utility model discloses a rotor assembly, a sound wave vibration motor and electric cleaning equipment. The rotor assembly comprises a transmission shaft, a coil, a conductive member and an outgoing line. The coil and the conductive piece are arranged on the transmission shaft and rotate along with the transmission shaft; the coil is connected with the conductive piece; the end part of the outgoing line is provided with a reverse folding part which is connected to the conductive piece; the conductive member is used for connecting the coil and the outgoing line. According to the invention, the end part of the lead-out wire is provided with the reflexed part which is connected to the conductive member, that is, the end part of the lead-out wire is folded by 180 degrees to obtain the reflexed part and then is connected to the conductive member, or the end part of the lead-out wire is connected to the conductive member and then is reversely folded by 180 degrees to form the reflexed part. The service life of the motor is prolonged; according to the invention, the problem of outgoing line loss is solved, the overall length of the motor can be further shortened, and the miniaturized design of the motor is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor assembly, a sonic vibration motor and an electric cleaning device. Background Art

[0002] The brushed motor consists of two major parts: the stator and the rotor. There are magnets on the stator and windings on the rotor. When power is turned on, a magnetic field is also formed on the rotor. There is an angle between the magnetic poles of the stator and the rotor. The mutual attraction of the stator and rotor magnetic fields (between the N pole and the S pole) makes the motor rotate.

[0003] The rotor is connected to the commutator through brushes, or the brushes are connected to the conductive slip rings. However, the rotor winding enameled wire is welded to the commutator, and the external wires are welded to the brush needles. Long-term use will cause wear on the contact surface, thereby affecting the working efficiency of the starter and even causing the starter to fail to start normally. In order to solve this problem, some sonic vibration motors in the industry directly lengthen the coil ends and lead them out of the machine cover as wires; some sonic vibration motors directly weld the wires to the coil ends and then lead them out of the machine cover; some sonic vibration motors add a connecting ring with a wiring part on the drive shaft of the rotor, and the connecting ring rotates with the drive shaft; although the above technical solutions can save the contact power-on mechanism composed of the conventional commutator / conductive slip ring and brushes to solve the problem of contact surface wear; however, when the traditional brushed sonic vibration motor is working, the rotor with the coil rotates, and the stator with the magnetic steel does not rotate, and the coil is energized by an external power supply or battery after the lead wire (i.e., the lead wire) passes through the back cover, but the back cover and the rotor are usually close, and the lead wire has limited space for movement. When the rotor deflects repeatedly at high speed for a long time, due to the limited length of the lead wire, the internal stress cannot be released, and the local part will be repeatedly stressed for a long time to produce fatigue, thereby causing wire breakage or other loss problems, reducing the service life of the motor. Utility Model Content

[0004] Based on this, it is necessary to provide a rotor assembly, an ultrasonic vibration motor and an electric cleaning device to address the above technical problems.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, a rotor assembly comprises a transmission shaft, a coil, a conductive member and a lead wire; the coil and the conductive member are both arranged on the transmission shaft and rotate with the transmission shaft; the coil is connected to the conductive member; the end of the lead wire has a folded portion, which is connected to the conductive member; the conductive member is used to connect the coil and the lead wire.

[0007] As a preferred embodiment of the present invention, the conductive member comprises a fixing portion for fixing and a connecting portion for wiring.

[0008] As a preferred embodiment of the present invention, the connecting portion has a first connecting end for connecting to the coil and a second connecting end for connecting to the folded portion.

[0009] As a preferred embodiment of the present invention, the first connection end extends in the radial direction of the transmission shaft; the second connection end extends in the axial direction of the transmission shaft; the first connection end and the second connection end are fixed by a fixing portion and electrically connected.

[0010] As a preferred embodiment of the present invention, a notch is provided on the first connecting end.

[0011] As a preferred embodiment of the present invention, a positioning portion is provided on the second connecting end.

[0012] As a preferred embodiment of the present invention, the rotor assembly further comprises an iron core, the iron core is arranged on the transmission shaft, and the coil is wound around the iron core.

[0013] As a preferred embodiment of the present invention, the rotor assembly has two conductive members.

[0014] As a preferred embodiment of the present invention, welding spots are provided at the connection points between the conductive member and the coil and the lead-out wire.

[0015] As a preferred embodiment of the present invention, the rotor assembly also includes a rubber-coated part that is formed by rubber-coating the iron core and the conductive part as one piece, and the iron core and the conductive part are partially exposed from the rubber-coated part; the rubber-coated part exposes a through hole of the iron core, and the transmission shaft passes through and is tightly fitted on the through hole; the coil is wound on the winding groove of the rubber-coated part.

[0016] In a second aspect, a sonic wave vibration motor is provided. The sonic wave vibration motor comprises the above-mentioned rotor assembly and a stator assembly arranged around the periphery of the rotor assembly.

[0017] As a preferred embodiment of the present invention, the sonic vibration motor also includes a machine cover, which is connected to the open end of the casing of the sonic vibration motor, and one end of the transmission shaft is rotatably connected to the machine cover; a wire hole for leading out the lead wire is opened on the machine cover, and the aperture of the wire hole gradually decreases from the inside to the outside of the machine cover.

[0018] As a preferred embodiment of the present invention, one side of the housing is a closed end, and the other side is an open end; a through hole is provided in the closed end for one end of the transmission shaft to pass through.

[0019] In a third aspect, an electric cleaning device comprises the rotor assembly or the sonic vibration motor as described above.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The rotor assembly provided by the present invention directly sets a conductive part on the transmission shaft, and the wire end of the coil and the lead wire connected to the outside can be directly welded and connected to the conductive part, which solves the problem of affecting the efficiency of the motor or failing to start due to the wear of the contact surface between the brush and the commutator or the brush and the conductive slip ring. At the same time, the end of the lead wire of the present invention has a folded portion, which is connected to the conductive part, that is, the end of the lead wire is folded 180 degrees to obtain the folded portion and then connected to the conductive part, or the end of the lead wire is connected to the conductive part and then folded 180 degrees to form the folded portion. Compared with the solution in the prior art that the lead wire is directly connected to the conductive part or directly connected to the coil, the present invention increases the activity space of the lead wire in the motor in the same size space, and increases the service life of the motor; compared with the solution in the prior art that directly lengthens the length of the lead wire in the motor to solve the lead wire loss problem, it needs to lengthen the length of the motor and will occupy more space of the terminal product. The present invention not only solves the problem of lead wire loss, but also can further shorten the overall length of the motor, which is conducive to the miniaturization design of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the scheme of the present invention, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of the rotor assembly provided by the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the decomposition of

[0025] Figure 3 for Figure 1 An exploded schematic diagram of the coil and lead wires are hidden in the figure;

[0026] Figure 4 for Figure 3 Side view of

[0027] Figure 5 for Figure 4 A cutaway stereogram of the middle AA;

[0028] Figure 6 for Figure 4 The cutaway perspective view of the middle AA shows the transmission shaft hidden in the figure;

[0029] Figure 7It is a schematic structural diagram of the conductive member of the present invention;

[0030] Figure 8 for Figure 7 A top view of

[0031] Fig. 9 It is a schematic diagram of the structure of the lead wire of the present invention;

[0032] Fig.10 It is a three-dimensional schematic diagram of the sonic vibration motor of the present invention;

[0033] Fig.11 for Fig.10 Schematic diagram of the decomposition of

[0034] Fig.12 is a three-dimensional schematic diagram of the cover of the present invention;

[0035] Fig.13 for Fig.12 A top view of

[0036] Fig.14 for Fig.13 A cutaway perspective view of the middle BB.

[0037] The markings in the figure are as follows:

[0038] Rotor assembly-1,

[0039] Transmission shaft - 100, straight tube shaft - 110, special-shaped shaft - 120;

[0040] Iron core-200, through hole-210, groove-220;

[0041] Coil - 300;

[0042] Conductive member 400, fixing portion 410, connecting portion 420, first connecting end 421, notch 4211, second connecting end 422, positioning portion 4221;

[0043] Lead-out line-500, folded portion 510;

[0044] Rubber coating-600, winding groove-610, extension tube 620;

[0045] Casing-2, accommodating chamber-21;

[0046] Cover-3, inner side-31, outer side-32, wire hole-33;

[0047] Stator assembly-4, bracket-41, magnet-42. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0049] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0050] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0052] Embodiment 1

[0053] Please refer to Figure 1-3 A rotor assembly 1 includes a transmission shaft 100, an iron core 200 fixedly connected to the transmission shaft 100, coils 300 respectively wound around the iron core 200 on both sides of the transmission shaft 100 in a radial direction, a conductive member 400 arranged on the transmission shaft 100 and rotating synchronously with the transmission shaft 100, and a lead wire 500; wherein the conductive member 400 is used to connect the coil 300 and the lead wire 500, and there are two conductive members 400, so that a DC power source can directly supply power to the coil 300 through the lead wire 500.

[0054] Through the above structural design, the conductive member 400 is directly arranged on the transmission shaft 100, and the wire ends of the coil 300 and the lead wires 500 connected to the outside can be directly welded and connected to the conductive member 400, solving the problem of the motor efficiency being affected or failing to start due to the wear of the contact surface between the brush and the commutator or the brush and the conductive slip ring. The structure is simple, not only does it save production costs by eliminating the commutator, brush and other materials from the structure, but it also eliminates the mechanical friction of the brush, thereby increasing the service life of the acoustic vibration motor, and there is no need to install an additional plastic ring for connecting and fixing the wire ends and the lead wires 500.

[0055] like Figure 1-3 and Fig. 9As shown, the end of the lead wire 500 has a folded portion 510, which is connected to the conductive member 400. The folded portion 510 and the body of the lead wire 500 are in a U-shaped structure. In specific implementation, the end of the lead wire 500 can be folded 180 degrees to obtain the folded portion 510 and then connected to the conductive member 400, or the end of the lead wire 500 can be connected to the conductive member 400 and then folded 180 degrees to form the folded portion 510.

[0056] Compared with the solution in the prior art that the lead wire 500 is directly connected to the conductive part 400 or directly connected to the coil 300, the present invention increases the movable space of the lead wire 500 in the motor in a space of the same size, thereby increasing the service life of the motor; compared with the solution in the prior art that directly lengthens the length of the lead wire 500 in the motor to solve the loss problem of the lead wire 500, which requires lengthening the length of the motor and occupies more space in the terminal product, the present invention not only solves the loss problem of the lead wire 500, but also can further shorten the overall length of the motor, which is beneficial to the miniaturized design of the motor.

[0057] Further, such as Figure 1-3 As shown in , 6-8, the conductive member 400 has a fixing portion 410 for fixing and a connecting portion 420 for wiring. The fixing portion 410 is used to be fixedly connected to the transmission shaft 100, so that the conductive member 400 rotates with the transmission shaft 100. The connecting portion 420 has a first connecting end 421 for connecting the coil 300 and a second connecting end 422 for connecting the inflected portion. The first connecting end 421 and the second connecting end 422 can be connected for electrical conduction through the fixing portion 410; they can also be directly connected for electrical conduction, wherein the fixing portion 410 is used for fixing and supporting. It should be noted that the first connecting end 421 and the second connecting end 422 can be on the same axis (have overlapping areas when viewed from above, such as Figure 8 Along the axial direction of the transmission shaft, the second connection end 422 may be flush with the end of the coil 300, or may extend beyond the end of the coil 300 and be closer to the cover 3.

[0058] The first connection end 421 extends in the radial direction of the transmission shaft 100. Furthermore, a notch 4211 is provided on the first connection end 421, so that the wire end of the coil 300 can be wound around the notch 4211 to achieve a stable connection with the conductive member 400. In order to further improve the stability of the conductive connection, the wire end is wound around the notch 4211 of the conductive member 400 and then welded to obtain a welding point.

[0059] In this embodiment, the inflected portion 510 is in a straight line shape. To facilitate connection with the conductive member 400, the second connection end 422 extends along the axial direction of the transmission shaft 100, so that the inflected portion 510 directly abuts against the second connection end 422. To further improve the stability of the conductive connection, the inflected portion 510 abuts against the second connection end 422 and then welds to obtain a welding point.

[0060] The second connection end 422 is provided with a positioning portion 4221, so that it is convenient to quickly abut the inflected portion 510 against the second connection end 422, and also convenient for subsequent welding. The positioning portion 4221 can be an inwardly concave arc groove, or can be other shapes and structures.

[0061] Please refer to Figure 3 The iron core 200 is an I-shaped structure with a through hole 210, and the through hole 210 is located in the middle of the I-shaped structure, so that the transmission shaft 100 can pass through and fix the iron core 200 on the transmission shaft 100. Please refer to Figure 3-9 The rotor assembly 1 further includes a rubber coating 600, which is formed by coating the iron core 200 with rubber through an integrated injection molding process, wherein the through hole 210 and the outer side of the iron core 200 are exposed from the rubber coating 600, and the rubber coating 600 is formed with winding grooves 610 along both sides of the through hole 210 in the radial direction, which is convenient for winding the coil 300. In order to further improve the stability of the rubber coating, a groove 220 is added to the wall of the through hole 210 of the iron core 200, so that part of the plastic is filled into the groove 220 during injection molding.

[0062] Please refer to Figure 1-6 The rubber-coated part 600 is further extended along both sides of the axial direction of the through hole 210 to form an extension tube 620 for the transmission shaft 100 to pass through, so as to increase the connection area between the rotor assembly 1 and the transmission shaft 100 and improve the transmission efficiency.

[0063] Please refer to Figure 3-5 In order to improve the transmission efficiency of the transmission shaft 100, the two ends of the transmission shaft 100 are rotatably connected to the housing 2 and the cover 3 of the motor through bearings. The transmission shaft 100 has a straight tube shaft 110 and a special-shaped shaft 120. The rubber-coated part 600 is tightly mounted on the straight tube shaft 110. One end of the straight tube shaft 110 is rotatably connected to the cover 3, and the other end is connected to the special-shaped shaft 120 by interference fit; the end of the special-shaped shaft 120 away from the straight tube shaft 110 extends out of the housing 2 and is rotatably connected to the housing 2, and is used to connect the toothbrush head.

[0064] The conductive member 400 can be directly set on the transmission shaft 100, and can also be integrally coated on the rubber-coated member 600, such as on the extension tube 620. With such a structural design, the iron core 200 and the conductive member 400 are integrally formed by the rubber-coated member. When assembling, the transmission shaft 100 can be directly passed through the through hole 210 and tightly fitted. The assembly process is simple, no additional installation steps are required, and it is also easy to realize automated production. Among them, the fixed part 410 is coated with rubber in the rubber-coated member 600, and the connecting part 420 is exposed outside the rubber-coated member 600, which is convenient for connecting and welding the wire head and the lead wire 500. In other embodiments, the lead wire 500 can also be directly welded on the surface of the fixed part 410 exposed on the rubber-coated member 600.

[0065] Embodiment 2

[0066] Please refer to Figure 10-11 , an acoustic wave vibration motor, comprising a housing 2, a cover 3, a rotor assembly 1 and a stator assembly 4 as in Example 1. Specifically, a transmission shaft 100 is rotatably connected in the housing 2; an end of a lead wire 500 away from a coil 300 passes through a wire hole 33 of the cover 3.

[0067] The housing 2 is an open structure, having a receiving cavity 21 for receiving the transmission shaft 100, the rotor assembly 1 and the stator assembly 4. A through hole is provided at the closed end of the housing 2, so that one end of the transmission shaft 100 can pass through and extend out of the housing 2 to connect to the toothbrush head. The cover 3 is fixed to the open side of the housing 2, and a pair of wire holes 33 are provided on the cover 3, so that the lead wires 500 can pass through to lead out the positive and negative poles of the rotor assembly 1 to connect to an external power source.

[0068] The stator assembly 4 is fixedly connected in the housing 2. The stator assembly 4 includes a bracket 41 with an inner cavity and a magnet 42 arranged on the bracket 41. The rotor assembly 1 is located in the inner cavity of the stator assembly 4. When an external power source supplies power to the coil 300 through the lead wire 500, the rotor assembly 1 and the stator assembly 4 form a magnetic field to drive the transmission shaft 100 to yaw.

[0069] like Figure 12-14 As shown, the cover 3 has an inner side 31 and an outer side 32, and the cover 3 is provided with wire holes 33, which all penetrate the cover 3. Furthermore, the diameter of the wire holes 33 gradually decreases from the inner side 31 to the outer side 32 of the cover 3, and the diameter of the wire holes 33 located on the inner side 31 is larger than the diameter of the wire holes 33 located on the outer side 32 of the cover body. With such a structural design, compared with the wire holes 33 of equal diameter, the wire holes 33 of variable diameter can provide a larger swing space for the lead wire 500. Under the premise of the existing mainstream motor length, the length of the lead wire inside the motor can be further expanded, and the service life of the lead wire can be extended. Moreover, the wire holes 33 located on the inner side have a large diameter, which acts as a guide hole, facilitating the passage of the lead wire 500, making the installation of the lead wire 500 more convenient.

[0070] Embodiment 3

[0071] An electric cleaning device, the electric cleaning device having the sonic vibration motor as described above. Exemplarily, the electric cleaning device provided by the present invention may be, but is not limited to, a sonic toothbrush or a facial cleanser.

[0072] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A rotor assembly, characterized in that: It includes a transmission shaft, a coil, a conductive part and a lead-out wire; the coil and the conductive part are both arranged on the transmission shaft and rotate with the transmission shaft; the coil is connected to the conductive part; the end of the lead-out wire has a folded part, which is connected to the conductive part; the conductive part is used to connect the coil and the lead-out wire.

2. A rotor assembly according to claim 1, characterized in that: The conductive member comprises a fixing portion for fixing and a connecting portion for wiring; the connecting portion comprises a first connecting end for connecting the coil and a second connecting end for connecting the folded portion.

3. A rotor assembly according to claim 2, characterized in that: The first connection end extends in a radial direction of the transmission shaft; the second connection end extends in an axial direction of the transmission shaft; the first connection end and the second connection end are fixed and electrically connected via a fixing portion.

4. A rotor assembly according to claim 3, characterized in that: The first connecting end is provided with a notch; and / or the second connecting end is provided with a positioning portion.

5. A rotor assembly according to claim 1, characterized in that: It also includes an iron core, which is arranged on the transmission shaft and the coil is wound around the iron core.

6. A rotor assembly according to any one of claims 1 to 5, characterized in that: The rotor assembly also includes a rubber-coated part formed by rubber-coating the iron core and the conductive part as one piece, wherein the iron core and the conductive part are partially exposed from the rubber-coated part; the rubber-coated part exposes a through hole of the iron core, and the transmission shaft passes through and is tightly fitted on the through hole; the coil is wound on the winding groove of the rubber-coated part.

7. A sonic vibration motor, characterized in that: The acoustic wave vibration motor comprises a rotor assembly as described in any one of claims 1 to 6 and a stator assembly arranged around the periphery of the rotor assembly.

8. The acoustic wave vibration motor according to claim 7, characterized in that: The sonic vibration motor also includes a machine cover, which is connected to the open end of the casing of the sonic vibration motor, and one end of the transmission shaft is rotatably connected to the machine cover; a wire hole for leading out the lead wire is opened on the machine cover, and the aperture of the wire hole gradually decreases from the inside to the outside of the machine cover.

9. The acoustic wave vibration motor according to claim 8, characterized in that: One side of the housing is a closed end, and the other side is an open end; a through hole is provided at the closed end for one end of the transmission shaft to pass through.

10. An electric cleaning device, characterized in that: It comprises a rotor assembly as described in any one of claims 1 to 6 or a sonic vibration motor as described in any one of claims 7 to 9.

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