Multi-magnetic-arm acoustic motor

Abstract

The utility model provides a kind of sound wave motor of multi-magnetic arm, including permanent magnet, electromagnet consisting of magnetic core and coil, it is characterized by: the magnetic core includes 3 or above magnetic arm, and the connecting portion of the magnetic arm between connection, wherein, magnetic arm is interval arrangement and forms N magnetic force action group between magnetic arm, magnetic arm gap is equipped with permanent magnet, N magnetic force action group drives all permanent magnet through transmission connecting piece for power transmission to driving shaft, the coil is wound on magnetic arm or connecting portion.The utility model in, with multiple magnetic force action group drive permanent magnet, finally the force of all permanent magnet is concentrated and is transmitted to motor driving shaft reciprocating vibration through transmission connecting piece, so that motor driving shaft force increases, under the same condition, save coil, current, and then can reduce the cost of driving chip and battery.

Description

Technical Field

[0001] This utility model relates to an acoustic motor with a multi-conductor magnetic arm. Background Technology

[0002] Sonic motors are widely used in reciprocating vibration type household appliances, including but not limited to: electric toothbrushes, shavers, beauty devices. Sonic motors are composed of electromagnets and permanent magnets. Typical structures include the top and bottom type (CN101297775A, CN113437851A), the internal and external type with an electromagnet rotor (CN205212674U), and the internal and external type with a permanent magnet rotor (CN210142929U, CN209389807U).

[0003] This invention addresses internal and external acoustic wave motors. All existing internal and external acoustic wave motors only have two magnetic arms. The reciprocating vibration of these motors drives the working parts (such as the brush head of an electric toothbrush) via a drive shaft. To increase the driving force, the current needs to be increased, which leads to higher costs for the control chip and battery.

[0004] In the above-mentioned existing technologies, the electromagnet only acts on one working surface 4 of the permanent magnet (see details). Figure 5 The two working surfaces of the permanent magnet were not effectively utilized.

[0005] However, a voice coil motor is disclosed in the prior art (CN219740180U), from which... Figure 1 It can be seen that its permanent magnet and the E-type back iron are tightly connected, forming a composite permanent magnet, which generates a fixed magnetic field. Furthermore, in terms of its driving method, the comparison document shows that it generates axial reciprocating motion. Utility Model Content

[0006] The main objective of this invention is to provide a multi-magnetic arm acoustic motor, specifically offering the following solution:

[0007] A multi-magnetic-arm acoustic motor includes a permanent magnet, an electromagnet composed of a magnetic core and coils, characterized in that: the magnetic core includes three or more magnetic arms and a connecting part connecting the magnetic arms, wherein the magnetic arms are spaced apart to form N magnetic force groups, permanent magnets are installed in the gaps between the magnetic arms, and the N magnetic force groups drive all permanent magnets to transmit power to the drive shaft through a transmission connector, and the coils are wound on the magnetic arms or the connecting part. There are three magnetic arms, and the three magnetic arms form a "mountain"-shaped magnetic core through the connecting part.

[0008] The "mountain" shaped magnetic core is made up of multiple "mountain" shaped silicon steel sheets stacked together.

[0009] The "mountain" shaped magnetic core is formed by connecting a columnar magnetic guide arm in the middle of a U-shaped magnetic core.

[0010] Beneficial effects: In this utility model, there are multiple sets of magnetic force groups driving permanent magnets, and finally the force of all permanent magnets is concentrated and transmitted to the motor drive shaft for reciprocating vibration through the transmission connector.

[0011] The structure of this invention places the permanent magnet in the gap between the magnetic arms. When the toothbrush head is vertically upward, the magnetic arms and the permanent magnet are at the same horizontal position. Unlike internal and external acoustic motors with only two magnetic arms and vertical acoustic motors with three magnetic arms, this significantly reduces the distance between the permanent magnet and the magnetic arms. This results in a significantly shortened magnetic circuit on the permanent magnet caused by the alternating magnetic field generated by the electromagnet. Furthermore, the electromagnet acts on two surfaces of the permanent magnet, thereby increasing the driving force of the motor shaft. Under the same conditions, this saves on coils and current, and thus reduces the cost of the drive chip and battery. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0013] Figure 1 This is a diagram of the internal structure of an acoustic motor.

[0014] Figure 2 This is an exploded view of the internal structure of a sonic motor.

[0015] Figure 3 This is a diagram of the internal structure of the magnetic core of an acoustic wave motor.

[0016] Figure 4 This is a diagram of the internal structure of the magnetic core of another acoustic motor.

[0017] Figure 5 a is a schematic diagram of the working surface of the permanent magnet in the prior art document (CN210142929U);

[0018] Figure 5 b is a schematic diagram of the working surface of the permanent magnet in the comparison file (CN205212674U);

[0019] Figure 5 c is a schematic diagram of the working surface of the permanent magnet in the comparison file (CN113437851A);

[0020] Figure 6 This is a schematic diagram of the working surface of the permanent magnet of this utility model. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment 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.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Furthermore, in this utility model, 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, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] See Figures 1 to 2 A multi-magnetic-arm acoustic motor includes a magnetic core 1 and a coil 2. The magnetic core 1 includes three or more magnetic arms 11 and a connecting part 12 connecting the magnetic arms 11. The magnetic arms 11 are spaced apart to form N magnetic force groups. Permanent magnets 3 are movably installed between the magnetic arms 11. The N magnetic force groups drive all permanent magnets 3 to transmit power to the drive shaft 5 through a transmission connector 4. The coil 2 is wound on the magnetic arms 11 or the connecting part 12.

[0026] In this invention, multiple sets of magnetic force groups drive permanent magnets, ultimately concentrating the force of all permanent magnets and transmitting it through a transmission connector to the motor drive shaft for reciprocating vibration. In this structure, the electromagnet simultaneously acts on two surfaces 4 of the permanent magnets (see details). Figure 6 This invention effectively utilizes permanent magnets, doubling the driving force under the same conditions. Furthermore, in this invention, the permanent magnet is positioned within the gap between the magnetic arms. When the toothbrush head is vertically upward, the magnetic arms and the permanent magnet are at the same horizontal level. Unlike internal and external acoustic motors with only two magnetic arms or vertical acoustic motors with three magnetic arms, this invention significantly reduces the distance between the permanent magnet and the magnetic arms. This results in a significantly shorter magnetic circuit on the permanent magnet caused by the alternating magnetic field generated by the electromagnet, increasing the driving force of the motor shaft. Under the same conditions, it saves on coils and current, thereby reducing the cost of the drive chip and battery. Moreover, by placing the permanent magnet in the gap between the magnetic arms rather than tightly connecting them, N alternating magnetic fields are generated between multiple magnetic arms acting on the permanent magnet, thus increasing the driving force.

[0027] Furthermore, there are three magnetic guide arms 11, which form a "mountain"-shaped magnetic core through the connecting part 12. In one example, it can be formed by stacking multiple "mountain"-shaped silicon steel sheets 111, or it can be formed by connecting a columnar magnetic guide arm 113 in the middle of a U-shaped magnetic core 112 (see...). Figure 3 Of course, there can be three or more magnetic guide arms, depending on the specific requirements. Figure 4 .

[0028] Furthermore, the coil 2 has two sets and is energized with currents of different frequencies.

[0029] Of course, in another embodiment, the connecting part 12 connecting the magnetic arms 11 can be removed, each magnetic arm is wound with a coil, the electromagnet is the drive shaft of the acoustic motor rotor, and the permanent magnet is the stator of the acoustic motor.

[0030] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A multi-conductor magnetic arm acoustic motor, comprising a permanent magnet and an electromagnet composed of a magnetic core and a coil, characterized in that: The magnetic core includes three or more magnetic guide arms, wherein the magnetic guide arms are spaced apart to form N magnetic force action groups, and permanent magnets are installed in the gaps between the magnetic guide arms.

2. The acoustic motor with a multi-conductor magnetic arm as described in claim 1, characterized in that, There are three magnetic guide arms, which form a "mountain" shaped magnetic core through the connecting part. N magnetic force groups drive all permanent magnets to transmit power to the motor drive shaft for reciprocating vibration through the transmission connector. The coil is wound on the magnetic guide arm or the connecting part.

3. The acoustic motor with a multi-conductor magnetic arm as described in claim 2, characterized in that, The "mountain" shaped magnetic core is made up of multiple "mountain" shaped silicon steel sheets stacked together.

4. The acoustic motor with a multi-conductor magnetic arm as described in claim 2, characterized in that, The "mountain" shaped magnetic core is formed by connecting a columnar magnetic guide arm in the middle of a U-shaped magnetic core.

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