A low-heat high-efficiency motor for an electric toothbrush

Abstract

The application provides a low-heat high-efficiency motor for electric toothbrush, which comprises a shell, a stator core, a coil winding, a motor shaft and a permanent magnet component, the stator core comprises a core main body matched with the permanent magnet component and a core magnetic conductor matched with the core main body in a magnetic conduction mode, the core magnetic conductor comprises a coil winding part extending horizontally, the coil winding is wound on the coil winding part and extends horizontally along an axial direction perpendicular to the motor shaft, and the length of the coil winding part in the core magnetic conductor is smaller than the length of the core main body along the axial direction of the motor shaft, and the length ratio of the two is less than 0.6. The application makes the coil winding part short but keeps the cross section unchanged, ensures the same ampere-turns and magnetic resistance, reduces the single-turn circumference of the coil winding under the premise of providing the same magnetic flux, effectively reduces the resistance heat, reduces the heat of the motor for electric toothbrush and finally improves the efficiency of the motor for electric toothbrush.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor, in particular to a low-heat and high-efficiency motor for an electric toothbrush. BACKGROUND

[0002] The electric toothbrush mainly comprises a motor (i.e. an electric machine) and a brush head, and the brush head is vibrated at high frequency by the rapid operation of the motor, so as to instantaneously decompose toothpaste into fine foam and deeply clean the interdental space; at the same time, the vibration of the bristles on the brush head can promote the blood circulation of the oral cavity and has a certain massage effect on the gum tissue. Therefore, the motor is a main component of the electric toothbrush.

[0003] Further, the motor for the electric toothbrush mainly comprises a stator part and a rotor part; wherein the stator part comprises a shell, and a stator core and a coil winding which are both fixed to the shell, and the coil winding is wound on the stator core; the rotor part comprises a motor shaft which is rotatably supported in the shell through a bearing, and a permanent magnet which is fixed to the outer surface of the motor shaft; the stator core cooperates with the permanent magnet. However, the stator core in the existing motor for the electric toothbrush is an integral piece; in addition, in order to ensure certain performance, the permanent magnet is generally relatively slender along the axial direction of the motor shaft, and the stator core cooperating with the permanent magnet has the same length as the permanent magnet, so that the stator core is also relatively slender; for example, a small high-frequency vibration device disclosed in the Chinese Utility Model Patent with the publication number CN203967899U; for example, an ultrasonic vibration motor disclosed in the Chinese Utility Model Patent with the publication number CN207321079U. In this way, it is inevitable to cause the single-turn circumference of the coil winding wound on the stator core to be relatively large, i.e. the single-turn cross section of the coil winding is relatively large, which directly leads to serious resistance heating, and the efficiency of the motor for the electric toothbrush is low and difficult to improve. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a low-heat and high-efficiency motor for an electric toothbrush, which reduces the single-turn circumference of the coil winding under the premise of keeping the cross section of the stator core unchanged.

[0005] To achieve the above object, the present application provides a low-heat and high-efficiency motor for electric toothbrush, comprising a housing, a stator core and a coil winding fixed to the housing, a motor shaft rotatably supported in the housing, and a permanent magnet part fixed to the motor shaft, the stator core comprises a core main body distributed around the outer periphery of the permanent magnet part and matched with the permanent magnet part, and a core magnetic conductor matched with the core main body in magnetic conduction, the core magnetic conductor comprises a coil winding part extending horizontally, the coil winding is wound on the coil winding part, and the coil winding extends horizontally along the axial direction perpendicular to the motor shaft; along the axial direction of the motor shaft, the length of the coil winding part in the core magnetic conductor is less than the length of the core main body, and the length ratio of the two is less than 0.6.

[0006] Further, the core magnetic conductor further comprises a bending part integrally extended from the end of the coil winding part, the end of the bending part away from the coil winding part extends to the core main body and is matched with the core main body in contact or gap; along the axial direction of the motor shaft, the length of the coil winding part in the core magnetic conductor is the same as the length of the bending part.

[0007] Further, along the axial direction of the motor shaft, the core magnetic conductor is distributed at the middle position of the core main body.

[0008] Further, the housing comprises a first housing and a second housing arranged oppositely along the axial direction of the motor shaft, and an intermediate housing distributed between the first housing and the second housing, the first housing and the second housing are fixedly connected, the two ends of the intermediate housing are fixedly connected with the first housing and the second housing respectively, the core main body is fixed to the first housing, and the core magnetic conductor and the coil winding are fixed to the intermediate housing.

[0009] Further, the intermediate housing, the core magnetic conductor and the coil winding are fixed as an independent prefabricated part.

[0010] Further, the material of the intermediate housing is plastic, and the intermediate housing is fixed to the outer periphery of the bending part of the core magnetic conductor in the form of injection molding.

[0011] Further, the two ends of the intermediate housing are provided with first plug-in convex parts protruding outward along the axial direction of the motor shaft, and first connecting grooves are formed in the first housing and the second housing, and the first plug-in convex parts are tightly plugged into the first connecting grooves.

[0012] Further, the materials of the first housing and the second housing are both plastic.

[0013] As described above, the motor for electric toothbrush involved in the present application has the following beneficial effects:

[0014] In the present application, the stator core is provided with core bodies and core magnetic conductors with different lengths. The coil winding part in the core magnetic conductor for winding the coil winding is short, and does not need to be as long and thin as the core body. The length of the coil winding part directly determines the single-turn circumference and cross-sectional size of the coil winding. According to the magnetic theory, when the total length of the magnetic path is constant, the magnetic motive force generated by the coil winding and the number of ampere turns (NI) are proportional, the magnetic resistance and the cross-sectional area are inversely proportional, and the magnetic flux generated by the coil winding is equal to the magnetic motive force divided by the magnetic resistance. In this way, the present application shortens the coil winding part while keeping the cross-sectional size unchanged, ensures the same number of ampere turns and magnetic resistance, and reduces the single-turn circumference of the coil winding under the premise of providing the same magnetic flux, thereby effectively reducing the resistance heating and the heating of the motor for electric toothbrush, and finally improving the efficiency of the motor for electric toothbrush. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of the motor for electric toothbrush in the present application.

[0016] Figure 2 FIG. 2 is a top view of the motor for electric toothbrush in the present application. Figure 1

[0017] Figure 3 FIG. 3 is an A-A sectional view of the motor for electric toothbrush in the present application. Figure 2

[0018] Figures 4 to 6 FIG. 4 is a structural schematic diagram of the motor for electric toothbrush in the present application without the shell.

[0019] Figure 7 FIG. 5 is a structural schematic diagram of the preform composed of the intermediate shell, the core magnetic conductor and the coil winding in the present application.

[0020] Figure 8 FIG. 6 is a structural schematic diagram of the first shell and the core body assembled in the present application.

[0021] Figure 9 FIG. 7 is a structural schematic diagram of the second shell in the present application.

[0022] ELEMENT REFERENCE

[0023] 10 shell

[0024] 11 first shell

[0025] 111 first mounting groove

[0026] 112 first connecting groove

[0027] 113 mounting clamping groove

[0028] 114 shell end

[0029] 115 shell body ​​

[0030] 116 second plug-in protrusion

[0031] 12 Second shell

[0032] 121 Second installation slot

[0033] 122 Second connection slot

[0034] 13 Intermediate housing

[0035] 131 first plug-in protrusion

[0036] 20 stator core

[0037] 21 Core body

[0038] 211 Arc segment

[0039] 212 horizontal section

[0040] 213 vertical section

[0041] 22 Iron core magnetic conductor

[0042] 221 Coil winding unit

[0043] 222 Bending section

[0044] 30 Coil winding

[0045] 40 motor shaft

[0046] 50 permanent magnet components

[0047] 51 permanent magnet

[0048] 60 First bearing

[0049] 70 Second bearing

[0050] 80 flexible parts DETAILED DESCRIPTION

[0051] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0052] It is to be understood that the structure, proportion, size and the like shown in the drawings of the present application are only used to cooperate with the content disclosed in the present application, so as to be understood and read by those skilled in the art, and do not have technical substantial meaning, and any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose of the present application, should still fall within the scope of the disclosed technology.

[0053] The present application provides a low-heat high-efficiency motor for electric toothbrush, which is used for electric toothbrush. Figures 1 to 3 As shown in the drawings, the motor for electric toothbrush of the present application comprises a housing 10, a stator core 20, a coil winding 30, a motor shaft 40 and a permanent magnet part 50; wherein the stator core 20 and the coil winding 30 are fixed to the housing 10; the motor shaft 40 is rotatably supported in the housing 10 by a bearing, and the motor shaft 40 is made of magnetic conductive material; the permanent magnet part 50 is arranged on the outer periphery of the motor shaft 40. For the convenience of description, the axial direction of the motor shaft 40 is defined as the front-rear direction in the present embodiment.

[0054] Further, as shown in the drawings, Figures 4 to 6 The stator core 20 comprises a core body 21 distributed on the outer periphery of the permanent magnet part 50 and matched with the permanent magnet part 50, and a core magnetic conductor 22 matched with each core body 21 in magnetic conduction. Figures 4 to 6 As shown in the drawings, the permanent magnet part 50 is arranged in a pair; accordingly, the core body 21 in the stator core 20 is also arranged in a pair, corresponding to the permanent magnet part 50. In addition, each permanent magnet part 50 is bipolar, having N and S poles; that is, each permanent magnet part 50 comprises two permanent magnets 51 with different polarities, the two permanent magnets 51 constituting each permanent magnet part 50 are arranged close along the circumferential direction of the motor shaft 40 and both extend along the axial direction of the motor shaft 40, so the permanent magnet 51 is an elongated strip structure; the two permanent magnet parts 50 connected in series have a gap in the circumferential direction of the motor shaft 40.

[0055] Further, as shown in the drawings, Figures 4 to 6As shown, the core body 21 and the core magnetic conductor 22 of the stator core 20 are two independent components, that is, the stator core 20 is a split structure, but the core body 21 and the core magnetic conductor 22 constituting the stator core 20 are both integral structures. Among them, the core body 21 is Y-shaped, and the end surface of the core body 21 facing the permanent magnet component 50 is a circular arc surface, that is, the part of the core body 21 close to the permanent magnet component 50 is a circular arc segment 211; the core body 21 includes a circular arc segment 211, a horizontal segment 212 extending horizontally in the left-right direction, and a vertical segment 213 extending vertically in the up-down direction in sequence from inside to outside. The core magnetic conductor 22 includes a coil winding part 221 extending horizontally in the left-right direction, and the coil winding 30 is wound on the coil winding part 221 of the core magnetic conductor 22, and the coil winding 30 extends horizontally in the left-right direction perpendicular to the motor shaft 40; thus, as shown in the figure, Figure 3 As shown, the length of the coil winding part 221 in the motor shaft 40 axial direction directly determines the single-turn circumference and cross-sectional size of the coil winding 30 in its winding direction: the longer the length of the coil winding part 221 in the motor shaft 40 axial direction, the larger the single-turn circumference and cross-sectional size of the coil winding 30; the shorter the length of the coil winding part 221 in the motor shaft 40 axial direction, the smaller the single-turn circumference and cross-sectional size of the coil winding 30. In particular, in this application, the length of the core body 21 in the motor shaft 40 axial direction can be the same as or different from the length of the permanent magnet component 50, but the length of the coil winding part 221 in the core magnetic conductor 22 is less than the length of the core body 21, and the ratio of the lengths of the two is less than 0.6.

[0056] When the above-mentioned motor for electric toothbrush works, the alternating current is passed through the coil winding 30, the core magnetic conductor 22 of the stator core 20 generates a magnetic circuit and conducts the magnetic circuit to the core body 21, the magnetic flux generated by the stator core 20 interacts with the permanent magnet 51 to convert electrical energy into mechanical energy; that is: under the joint action of the permanent magnet component 50, the stator core 20 and the coil winding 30, the motor shaft 40 is driven to oscillate, and the brush head is fixed on the motor shaft 40, then the motor shaft 40 drives the brush head of the electric toothbrush to oscillate quickly. In the working process, the stator core 20 generates resistance heat: Q=I 2*R, the resistance R per turn of the stator core 20 is proportional to the circumference of a single turn of the coil winding 30. After the stator core 20 is configured in the present application as a split core body 21 and a core magnetizer 22 of different lengths, the coil winding portion 221 in the core magnetizer 22 for winding the coil winding 30 can be shortened, and does not need to be as slender as the core body 21; and the length of the coil winding portion 221 directly determines the circumference and cross-sectional size of a single turn of the coil winding 30. In addition, according to magnetic theory, when the total length of the magnetic path remains unchanged, the magnetomotive force generated by the coil winding 30 is proportional to the ampere-turns (NI), the magnetic resistance is inversely proportional to the cross-sectional area, and the magnetic flux generated by the coil winding 30 is equal to the magnetomotive force divided by the magnetic resistance. Thus, the present application shortens the coil winding portion 221 while maintaining the same cross-section, ensuring the same ampere-turns and magnetic resistance. While maintaining the same magnetic flux, the circumference of the coil winding 30 per turn can be reduced, thereby reducing the resistance R per turn of the stator core 20. This effectively reduces the resistive heating of the stator core 20 while maintaining the same magnetic flux, thereby reducing the heat generation of the electric toothbrush motor and ultimately improving the efficiency of the electric toothbrush motor. Furthermore, the present application only configures a single coil winding 30 on one side of the motor shaft 40, effectively reducing costs while maintaining the performance advantages of the electric toothbrush motor and also facilitating a reduction in size.

[0057] Furthermore, the structure of magnetic conduction between the core body 21 and the core magnetic conductor 22 is as follows: Figures 3 to 6 As shown, the core magnetic conductor 22 further includes a bent portion 222 integrally extending from the left and right ends of the coil winding portion 221 toward the core body 21. The bent portion 222 extends from one end of the coil winding portion 221 to the vertical section 213 of the core body 21 and is in contact or clearance fit with the vertical section 213 of the core body 21, thereby achieving magnetic conduction between the core magnetic conductor 22 and the two core bodies 21. Of course, in other embodiments, a bent portion extending to the coil winding portion 221 and in contact or clearance fit with the coil winding portion 221 may also be provided on the core body 21.

[0058] Preferably, if Figures 4 to 6 As shown, along the axial direction of the motor shaft 40, the length of the coil winding portion 221 of the core magnetizer 22 is the same as the length of the bent portion 222, meaning that the core magnetizer 22 as a whole has the same length in the front-to-back direction. The length of the arc segment 211, the length of the horizontal segment 212, and the length of the vertical segment 213 of the core body 21 are the same, meaning that the core body 21 as a whole has the same length in the front-to-back direction. Furthermore, along the axial direction of the motor shaft 40, the core magnetizer 22 is located in the middle of the core body 21, with the front end of the core body 21 located in front of the core magnetizer 22 and the rear end of the core body 21 located in the rear of the core magnetizer 22.

[0059] Furthermore, ifFigures 1 to 3 As shown in the figure, the housing 10 comprises a first shell 11 and a second shell 12 arranged axially opposite to each other along the motor shaft 40, and an intermediate shell 13 distributed between the first shell 11 and the second shell 12, the first shell 11 and the second shell 12 are fixedly connected, the front and rear ends of the intermediate shell 13 are fixedly connected with the first shell 11 and the second shell 12 respectively, the core main body 21 is fixed to the first shell 11, and the core magnetic conductor 22 and the coil winding 30 are both fixed to the intermediate shell 13. Preferably, the materials of the first shell 11, the second shell 12 and the intermediate shell 13 are all plastic, then the first shell 11, the second shell 12 and the intermediate shell 13 are all injection molding parts, and are also integrally formed parts, which is beneficial to reduce the cost and facilitate assembly.

[0060] Preferably, the fixing mode between the core magnetic conductor 22 and the intermediate shell 13 can be: 1. gluing after being processed respectively; 2. directly gluing during the injection molding of the intermediate shell 13, that is, the intermediate shell 13 is directly fixed to the outer periphery of the bent part 222 of the core magnetic conductor 22 in the form of injection molding. In addition, as shown in the figure, Figure 7 As shown in the figure, the intermediate shell 13, the core magnetic conductor 22 and the coil winding 30 are fixed as a separate prefabricated part, which is beneficial to the winding of the coil winding 30, and is also beneficial to the processing, assembly and maintenance of the motor for electric toothbrush; when assembling the motor for electric toothbrush, the intermediate shell 13 in the prefabricated part is directly fixed to the first shell 11 and the second shell 12 respectively.

[0061] Further, as shown in the figures, Figure 1 and Figure 8 As shown in the figure, the first shell 11 comprises a shell end part 114 and a shell main body 115 extending straight rearward from the lower rear end of the shell end part 114, the shell main body 115 extends to the front end face of the second shell 12 and is inserted and connected with the same, and the shell main body 115 comprises a bottom part located at the lower side of the motor shaft 40 and side parts located at the left and right sides of the motor shaft 40. An installation space is formed between the shell end part 114 of the first shell 11 and the second shell 12, the installation space is located at the upper side of the motor shaft 40, the prefabricated part formed by the assembly of the intermediate shell 13, the core magnetic conductor 22 and the coil winding 30 is accommodated in the installation space, the front end of the intermediate shell 13 is inserted and connected with the shell end part 114 of the first shell 11, and the rear end of the intermediate shell 13 is inserted and connected with the second shell 12. Specifically, as shown in the figure, Figures 7 to 9As shown, the front and rear ends of the intermediate shell 13 are provided with first plug-in protrusions 131 which protrude axially outward along the motor shaft 40, and the rear end surface of the shell end portion 114 of the first shell 11 and the front end surface of the second shell 12 are provided with first connecting grooves 112; the first plug-in protrusions 131 at the front end of the intermediate shell 13 are tightly plugged into the first connecting grooves 112 of the shell end portion 114 of the first shell 11, thereby fixing the preform to the first shell 11; the first plug-in protrusions 131 at the rear end of the intermediate shell 13 are tightly plugged into the first connecting grooves 112 of the second shell 12, thereby fixing the preform to the second shell 12. The rear end surface of the shell main body 115 of the first shell 11 is provided with a second plug-in protrusion 116 which protrudes outward rearward, and the front end surface of the second shell 12 is provided with a second connecting groove 122; the second plug-in protrusion 116 of the first shell 11 is tightly plugged into the second connecting groove 122 of the second shell 12, thereby fixing the first shell 11 to the second shell 12. As shown in Figure 8 As shown, the side portion of the shell main body 115 of the first shell 11 is provided with a mounting clamping groove 113 which is adapted in shape to the cross section of the core main body 21, and the mounting clamping groove 113 penetrates through the side portion of the shell main body 115 rearward; the core main body 21 is inserted into the mounting clamping groove 113 from the rear end of the shell main body 115, thereby fixing the core main body 21 in the shell main body 115.

[0062] Further, as shown in Figure 3As shown, the bearings for rotatably supporting the motor shaft 40 in the housing 10 have two, the first bearing 60 and the second bearing 70 arranged in front and back respectively, the motor shaft 40 is rotatably supported in the first housing 11 through the first bearing 60, and the motor shaft 40 is rotatably supported in the second housing 12 through the second bearing 70. In particular, the housing end 114 of the first housing 11 is provided with a first mounting groove 111 facing away from the outer end of the second housing 12, the outer end of the first mounting groove 111 penetrates the first housing 11 forwardly, the first bearing 60 is accommodated in the first mounting groove 111, and the inner ring of the first bearing 60 is fixedly connected with the motor shaft 40, and the groove bottom of the inner end of the first mounting groove 111 stops the first bearing 60; the outer end of the second housing 12 is provided with a second mounting groove 121 facing away from the outer end of the first housing 11, the outer end of the second mounting groove 121 penetrates the second housing 12 rearwardly, the second bearing 70 is accommodated in the second mounting groove 121, and the inner ring of the second bearing 70 is fixedly connected with the motor shaft 40, and the groove bottom of the inner end of the second mounting groove 121 stops the second bearing 70. When assembling the motor shaft 40 and the first housing 11, the motor shaft 40 is inserted into the inner hole of the first housing 11, the first bearing 60 is knocked into the first mounting groove 111 of the first housing 11 from the front end of the motor shaft 40 rearwardly until the first bearing 60 abuts against the groove bottom of the first mounting groove 111, then the first bearing 60 is pressed tightly inwardly to the first housing 11. Similarly, when assembling the motor shaft 40 and the second housing 12, the motor shaft 40 is inserted into the inner hole of the second housing 12, the second bearing 70 is knocked into the second mounting groove 121 of the second housing 12 from the rear end of the motor shaft 40 forwardly until the second bearing 70 abuts against the groove bottom of the second mounting groove 121, then the second bearing 70 is pressed tightly inwardly to the second housing 12. In this way, after the first bearing 60 and the second bearing 70 are installed, the first housing 11 and the second housing 12 are clamped and connected in the front-rear direction by the fastening force of the inner ring of the first bearing 60 and the motor shaft 40 and the fastening force of the inner ring of the second bearing 70 and the motor shaft 40, realizing the assembly of the first bearing 60 and the second bearing 70 from the outside of the housing and clamping the first housing 11 and the second housing 12, thereby realizing the packaging of the product. Moreover, when assembling the motor shaft 40 and the first housing 11, and the motor shaft 40 and the second housing 12, only the first bearing 60 needs to be knocked into the first housing 11 from the outside of the first housing 11, and the second bearing 70 needs to be knocked into the second housing 12 from the outside of the second housing 12, which is a riveting process, realizing the packaging of the product and the installation of the bearing, saving the installation process and improving the assembly efficiency.

[0063] Preferably, the inner ring of the first bearing 60 is riveted or glued to the motor shaft 40, and the inner ring of the second bearing 70 is riveted or glued to the motor shaft 40.

[0064] Further, as Figure 3As shown, in the axial direction of the motor shaft 40, a flexible member 80 with elasticity is arranged between the inner end of the first bearing 60 and the first housing 11, and the flexible member 80 at this position is appropriately compressed to generate a forward force; or, a flexible member 80 with elasticity is arranged between the inner end of the second bearing 70 and the second housing 12, and the flexible member 80 at this position is appropriately compressed to generate a backward force; or, a flexible member 80 with elasticity is arranged between the inner end of the first bearing 60 and the first housing 11, and between the inner end of the second bearing 70 and the second housing 12. The flexible member 80 is a silica gel ring, or a gasket made of other elastic material, to realize flexible support at the first bearing 60 and the second bearing 70. In this way, when the outer ring of the first bearing 60 and / or the second bearing 70 is staggered by force in the forward and backward direction Z, the flexible member 80 can eliminate the Z-direction play of the first bearing 60 and / or the second bearing 70, thereby eliminating the operation noise of the first bearing 60 and / or the second bearing 70. In addition, when the motor shaft 40 is subjected to a Z-direction impact force when falling, the flexible member 80 can buffer the impact force, and play a certain protection role.

[0065] In summary, the present application effectively overcomes the shortcomings in the prior art and has high industrial utilization value.

[0066] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A low-heat-generating, high-efficiency motor for an electric toothbrush, comprising a housing (10), a stator core (20) and a coil winding (30) both fixed to the housing (10), a motor shaft (40) rotatably supported in the housing (10), and a permanent magnet component (50) fixed to the motor shaft (40), characterized in that: The stator core (20) comprises an iron core body (21) distributed on the periphery of the permanent magnet component (50) and matched with the permanent magnet component (50), and an iron core magnetizer (22) magnetically conductively matched with the iron core body (21); the iron core magnetizer (22) comprises a coil winding portion (221) extending straightly, the coil winding (30) is wound on the coil winding portion (221), and the coil winding (30) extends straight along an axial direction perpendicular to the motor shaft (40); along the axial direction of the motor shaft (40), the length of the coil winding portion (221) in the iron core magnetizer (22) is less than the length of the iron core body (21), and the ratio of the lengths of the two is less than 0.6; The iron core magnetic conductor (22) further comprises a bent portion (222) integrally extending from an end of the coil winding portion (221), wherein the bent portion (222) extends to the iron core body (21) away from one end of the coil winding portion (221) and is in contact or clearance fit with the iron core body (21); along the axial direction of the motor shaft (40), the length of the coil winding portion (221) in the iron core magnetic conductor (22) is the same as the length of the bent portion (222); The housing (10) comprises a first shell (11) and a second shell (12) arranged axially relative to each other along the motor shaft (40), and an intermediate shell (13) distributed between the first shell (11) and the second shell (12), wherein the first shell (11) and the second shell (12) are fixedly connected, and two ends of the intermediate shell (13) are respectively fixedly connected to the first shell (11) and the second shell (12), the iron core body (21) is fixed to the first shell (11), and the iron core magnetic conductor (22) and the coil winding (30) are both fixed to the intermediate shell (13).

2. The electric toothbrush motor according to claim 1, wherein: Along the axial direction of the motor shaft (40), the iron core magnetic conductor (22) is distributed at a middle position of the iron core body (21).

3. The electric toothbrush motor according to claim 1, wherein: The intermediate housing (13), the iron core magnetic conductor (22) and the coil winding (30) are fixed as an independent prefabricated component.

4. The electric toothbrush motor according to claim 1, wherein: The intermediate shell (13) is made of plastic, and is fixed to the outer periphery of the bent portion (222) in the iron core magnetic conductor (22) by injection molding.

5. The electric toothbrush motor according to claim 1, wherein: Both ends of the intermediate housing (13) are provided with first plug-in protrusions (131) protruding outward along the axis of the motor shaft (40); first connecting grooves (112) are provided in the first housing (11) and the second housing (12); and the first plug-in protrusions (131) are tightly plugged into the first connecting grooves (112).

6. The electric toothbrush motor according to claim 1, wherein: The first shell (11) and the second shell (12) are both made of plastic.

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