Magnetic suspension motor of electric toothbrush

Abstract

An electric toothbrush magnetic suspension motor relates to an electric toothbrush. Comprising a seat body, a motor stator, a swing rotor and a supporting block, the swing rotor comprises a swing shaft, a rotor iron core and a reset supporting sheet which are connected in sequence; the hollow-out area is arranged in the middle of the reset supporting piece, the weight of the reset supporting piece is reduced through the hollow-out area, the reset supporting piece can respond faster, meanwhile, airflow can be helped to pass through, the heat dissipation performance is improved, and then the stability during high-speed swing is improved. The reset supporting piece is fixedly connected with the supporting block through a positioning pin. The positioning pin can provide additional support for connection of the reset supporting piece, the structural strength of the connecting part is enhanced, under the condition of high-frequency vibration or swing, the positioning pin can effectively avoid damage or failure caused by infirm connection, and the service life of the reset supporting piece is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of electric toothbrush technology, and in particular to a magnetic levitation motor for electric toothbrushes. Background Technology

[0002] The high-frequency vibration motor used in electric toothbrushes is derived from the traditional DC motor. By controlling the direction of the current flowing into the winding, the N-pole magnet and the S-pole magnet are deflected, which drives the iron core rotor to rotate back and forth. This drives the spring connected to the shaft to rotate back and forth, resulting in torsional deformation. This structure is prone to fatigue during high-frequency reciprocating vibration, has a low frequency and unstable frequency, and its structural design is complex, with high noise generated by the assembly of parts.

[0003] To address the aforementioned issues, the applicant filed a utility model patent application on December 28, 2017, with application number 201721894379.0, disclosing a high-frequency vibration motor for electric toothbrushes. The motor includes a rotor assembly and a U-shaped stator core. The rotor assembly is connected to the stator core via a U-shaped base. The rotor assembly includes a rotor core made of permanent magnets, which is disposed within the stator core. By controlling the horizontal distance between the sidewalls of the rotor core and the opposite sidewalls of the stator core, the noise of the high-frequency vibration motor for electric toothbrushes is reduced, and the brushing force of the electric toothbrush is improved. To ensure that the rotor core can rotate freely within the stator cavity, an air gap is maintained between the rotor core and the stator core. When the stator core is energized, the rotor core oscillates within the stator core, realizing the energy conversion between electrical and mechanical energy. However, after long-term use, connection failures are prone to occur at the connection between the rotor tail and the tail cap. Therefore, improving the reliability of the rotor tail connection is a crucial technical problem that needs to be solved in this application. Utility Model Content

[0004] To address the above problems, this invention provides a magnetic levitation motor for electric toothbrushes with a compact structure that reduces the probability of rotor tail connection failure.

[0005] The technical solution of this utility model is:

[0006] The electric toothbrush magnetic levitation motor includes:

[0007] The base has a U-shaped cross-section, with a front end cover at the front and a rear end cover at the rear.

[0008] The motor stator is fixedly mounted inside the housing.

[0009] The oscillating rotor includes a oscillating shaft, a rotor core, and a reset support plate connected in sequence; the oscillating shaft extends from the front end cover and is used to connect with the brush head; the rotor core is oscillatingly disposed within the motor stator; the reset support plate is plate-shaped and located within the tail end cover, and the reset support plate has a hollow area in the middle.

[0010] The support block has a rectangular cross-section and is fixedly installed inside the tail end cover; the support block has a positioning groove that matches the reset support piece, and the end of the reset support piece is fixedly installed in the positioning groove.

[0011] Specifically, the side of the positioning groove is provided with several positioning holes;

[0012] The reset support plate is provided with several through holes that are adapted to the positioning holes, and the reset support plate is fixedly connected to the support block through the positioning holes and the positioning pins in the through holes.

[0013] Specifically, the reset support piece is inserted into the positioning groove, and the reset support piece is fixedly connected to the support block through a welding layer.

[0014] Specifically, the swing shaft is oscillatingly connected to the front end cover via a bearing.

[0015] Specifically, the tail cap includes a cover portion and a fixing portion that are fixedly connected in sequence;

[0016] The cover portion is detachably and fixedly mounted on the base;

[0017] The fixing part is provided with a fixing groove that is adapted to the support block.

[0018] Specifically, the thickness of the reset support piece is 0.5~0.9mm.

[0019] This utility model includes a base, a motor stator, a swing rotor, and a support block. The swing rotor includes a swing shaft, a rotor core, and a reset support plate connected in sequence. The reset support plate has a hollow area in the middle. By setting the hollow area, the mass of the reset support plate is reduced, enabling it to respond faster. It also facilitates airflow, improves heat dissipation, and thus enhances stability during high-speed swinging. The reset support plate is fixedly connected to the support block by a locating pin. The locating pin provides additional support for the connection of the reset support plate, strengthens the structural strength of the connection, and effectively prevents damage or failure due to loose connection under high-frequency vibration or swinging conditions, extending the service life of the reset support plate. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the connection structure of the oscillating rotor;

[0022] Figure 3 This is a schematic diagram of the connection structure between the reset support plate and the support block;

[0023] 100 in the diagram represents the motor stator.

[0024] 200 is the oscillating rotor, 210 is the oscillating shaft, 220 is the rotor core, 230 is the reset support plate, and 231 is the hollowed-out area.

[0025] 300 is the support block, and 310 is the fixing groove. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The present invention will now be described with reference to Figures 1-3;

[0030] The electric toothbrush magnetic levitation motor includes:

[0031] The base has a U-shaped cross-section, with a front end cover at the front and a rear end cover at the rear.

[0032] The motor stator 100 is fixedly mounted in the housing;

[0033] The oscillating rotor 200 includes a oscillating shaft 210, a rotor core 220, and a reset support plate 230 connected in sequence; the oscillating shaft 210 extends from the front end cover and is used to connect with the brush head; the rotor core 220 is oscillatingly disposed within the motor stator 100; the reset support plate 230 is plate-shaped and located within the tail end cover, and the reset support plate 230 has a hollow area 231 in the middle.

[0034] By setting the hollow area 231, the mass of the reset support plate 230 is reduced, enabling it to respond faster. At the same time, it can help airflow pass through, improve heat dissipation performance, and thus improve stability during high-speed oscillation.

[0035] The support block 300 has a rectangular cross-section and is fixedly installed inside the tail end cover. The support block 300 is provided with a positioning groove that matches the reset support piece 230. The end of the reset support piece 230 is fixedly installed in the positioning groove, which further improves the reliability of the reset support piece 230 connection.

[0036] The side of the positioning groove is provided with several positioning holes;

[0037] The reset support plate 230 is provided with several through holes that are adapted to the positioning holes. The reset support plate 230 is fixedly connected to the support block 300 through the positioning holes and the positioning pins in the through holes.

[0038] The locating pin provides additional support for the connection of the reset support plate 230, enhancing the structural strength of the connection. Under high-frequency vibration or oscillation, the locating pin effectively prevents damage or failure caused by loose connection, extending the service life of the reset support plate 230. It also reduces localized wear or damage caused by the reset support plate 230 wobbling during movement. Especially in applications with frequent vibration, the locating pin effectively distributes and transmits stress, protecting the reset support plate 230 and related components. In this case, the reset support plate 230 is made of a spring sheet.

[0039] The reset support piece 230 is inserted into the positioning groove, and the reset support piece 230 is fixedly connected to the support block 300 through the welding layer.

[0040] The swing shaft 210 is oscillatingly connected to the front cover via a bearing.

[0041] The tail cap includes a cover portion and a fixing portion that are fixedly connected in sequence;

[0042] The cover is detachably and fixedly mounted on the base.

[0043] The fixing part is provided with a fixing groove 310 that is adapted to the support block 300.

[0044] The thickness of the reset support piece 230 is 0.5~0.9mm.

[0045] Regarding the information disclosed in this case, the following points need to be clarified:

[0046] (1) The accompanying drawings of the embodiments disclosed in this case only involve the structures involved in the embodiments disclosed in this case. Other structures can refer to the general design.

[0047] (2) Where there is no conflict, the embodiments and features disclosed in this case can be combined with each other to obtain new embodiments;

[0048] The above are merely specific embodiments disclosed in this case, but the scope of protection of this disclosure is not limited thereto. The scope of protection disclosed in this case shall be determined by the scope of protection of the claims.

Claims

1. A magnetic levitation motor for an electric toothbrush, characterized in that, include: The base has a U-shaped cross-section, with a front end cover at the front and a rear end cover at the rear. The motor stator (100) is fixedly mounted in the housing; The oscillating rotor (200) includes a oscillating shaft (210), a rotor core (220), and a reset support plate (230) connected in sequence; the oscillating shaft (210) extends from the front end cover and is used to connect with the brush head; the rotor core (220) is oscillatingly disposed within the motor stator (100); the reset support plate (230) is plate-shaped and located within the tail end cover, and the reset support plate (230) has a hollow area (231) in the middle. The support block (300) has a rectangular cross-section and is fixedly installed inside the tail end cover; the support block (300) is provided with a positioning groove that is adapted to the reset support piece (230), and the end of the reset support piece (230) is fixedly installed in the positioning groove.

2. The electric toothbrush magnetic levitation motor according to claim 1, characterized in that, The side of the positioning groove is provided with several positioning holes; The reset support plate (230) is provided with several through holes that are adapted to the positioning holes. The reset support plate (230) is fixedly connected to the support block (300) through the positioning holes and the positioning pins in the through holes.

3. The electric toothbrush magnetic levitation motor according to claim 1, characterized in that, The reset support piece (230) is inserted into the positioning groove, and the reset support piece (230) is fixedly connected to the support block (300) through the welding layer.

4. The electric toothbrush magnetic levitation motor according to claim 1, characterized in that, The swing shaft (210) is oscillatingly connected to the front cover via a bearing.

5. The electric toothbrush magnetic levitation motor according to claim 1, characterized in that, The tail cap includes a cover portion and a fixing portion that are fixedly connected in sequence; The cover portion is detachably and fixedly mounted on the base; The fixing part is provided with a fixing groove (310) that is adapted to the support block (300).

6. The electric toothbrush magnetic levitation motor according to claim 1, characterized in that, The thickness of the reset support piece (230) is 0.5~0.9mm.

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