WO2019056594A1 - 微型直流电机 - Google Patents

微型直流电机 Download PDF

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Publication number
WO2019056594A1
WO2019056594A1 PCT/CN2017/115885 CN2017115885W WO2019056594A1 WO 2019056594 A1 WO2019056594 A1 WO 2019056594A1 CN 2017115885 W CN2017115885 W CN 2017115885W WO 2019056594 A1 WO2019056594 A1 WO 2019056594A1
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WIPO (PCT)
Prior art keywords
output shaft
micro
support frame
permanent magnets
motor according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/115885
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English (en)
French (fr)
Inventor
李金志
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Lebond Electronic Technology Co Ltd
Original Assignee
Dongguan Lebond Electronic Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Dongguan Lebond Electronic Technology Co Ltd filed Critical Dongguan Lebond Electronic Technology Co Ltd
Priority to EP17926049.2A priority Critical patent/EP3687050A4/en
Priority to JP2020515963A priority patent/JP6999883B2/ja
Publication of WO2019056594A1 publication Critical patent/WO2019056594A1/zh
Priority to US16/819,193 priority patent/US11289989B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
    • A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B13/00—Brushes with driven brush bodies or carriers
    • A46B13/02—Brushes with driven brush bodies or carriers power-driven carriers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/38—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary
    • H02K21/44—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary with armature windings wound upon the magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor

Definitions

  • the present invention relates to the field of electric toothbrush accessories, and more particularly to a miniature DC motor.
  • Electric toothbrushes are mainly composed of rechargeable batteries, miniature DC motors, battery boxes, toothbrush heads, metal guards and sleeves. .
  • the electric toothbrush is driven by electric power, and the brush head moves at a speed of several thousand times or even tens of thousands of times per minute, and the vibration efficiency is much higher than that of the manual toothbrush.
  • miniature DC motors for electric toothbrush vibration.
  • One is that the DC rotating motor and the eccentric wheel become the vibration motor, and the other is that the motor is oscillated to the left and right by the converter control on the circuit, and the middle connection spring of the power shaft rebounds.
  • the structure is to ensure that the gap of the circuit switching compensates for the lack of kinetic energy.
  • the implementation manners of the above two types of motors are relatively complicated, the manufacturing cost is high, and the friction noise during operation is large.
  • a miniature DC motor includes: a bottom cover, a receiving seat mounted on the bottom cover, an outer casing mounted on the receiving seat, a support frame mounted in the outer casing, and mounted on the support frame Four permanent magnets and coils, an output shaft mounted on the socket and extending outside the casing, a core mounted on the output shaft; each of the two permanent magnets is symmetrically located on a side of the support frame, and the center and the two permanent magnets on the same side of the support frame
  • the axial connection of the output shaft forms an angle of 50° to 60°;
  • the iron core includes a swing arm sleeved on the output shaft, and a swing arm symmetrically disposed on two sides of the sleeve portion. The swing arm is disposed opposite to the permanent magnet.
  • the micro DC motor includes a bottom cover, a receiving seat mounted on the bottom cover, a casing mounted on the receiving seat, a support frame installed in the outer casing, four permanent magnets and coils mounted on the support frame, and being mounted on the receiving An output shaft that protrudes from the outside of the casing and an iron core that is mounted on the output shaft.
  • the iron core becomes the excitation core under the action of the magnetic field after the energization, and the iron core swings left and right under the action of the magnetic field of the permanent magnet to drive the output shaft to swing left and right.
  • the permanent magnet Because the angle between the center of the two permanent magnets on the same side of the support frame and the axis of the output shaft is 50°-60°, according to the cosine theorem, the permanent magnet generates a large auxiliary force, and the force stroke is sufficient, and the swing is sufficient. The amplitude is large, and the return spring is not needed to compensate for the shortage of the neutral power of the circuit switching in the gap of the current direction transition, and the structure is simple and the noise is small.
  • the output shaft is mounted with a lower bearing and an upper bearing, the lower bearing is located on the receiving seat, and the upper bearing is located on the outer casing.
  • the receiving seat is provided with a first bearing groove and two card slots, and the first bearing groove houses the lower bearing, and the card slot extends toward the bottom cover.
  • the bottom cover protrudes from the two blocks, and the blocks are relatively aligned with the card slots.
  • the receiving seat protrudes from the two arcuate blocks, and the arcuate block abuts against the inner wall of the outer casing.
  • the outlet of the coil is threaded out of the bottom cover.
  • the swing arm is provided with an arcuate groove and two force receiving surfaces, and the second The force planes are symmetrically located on both sides of the arcuate groove and are disposed opposite to the permanent magnets.
  • the support frame includes a first frame body and a second frame body, and one ends of the first frame body and the second frame body abut against the socket frame.
  • the first frame is provided with a first mounting slot and a first winding slot, and the first mounting slot extends longitudinally to accommodate the permanent magnet, and the first winding slot is laterally The coil is extended to accommodate.
  • the second frame is provided with a second mounting slot and a second winding slot, and the second mounting slot extends longitudinally to receive the permanent magnet and is connected to the first mounting slot.
  • the second winding groove laterally extends to receive the coil and is opposite to the first winding groove.
  • FIG. 1 is a schematic view of a micro DC motor according to a preferred embodiment of the present invention.
  • FIG. 2 is an exploded perspective view of the micro DC motor shown in FIG. 1;
  • Figure 3 is a cross-sectional view of the micro DC motor shown in Figure 1;
  • Figure 4 is another cross-sectional view of the micro DC motor shown in Figure 1;
  • Figure 5 is another cross-sectional view of the micro DC motor shown in Figure 4.
  • Figure 6 is a schematic view of the bottom cover of the micro DC motor shown in Figure 2;
  • Figure 7 is a schematic view of the receiving seat of the micro DC motor shown in Figure 2;
  • Figure 8 is a schematic view of the outer casing of the micro DC motor shown in Figure 2;
  • Figure 9 is a schematic view of the first frame of the micro DC motor shown in Figure 2;
  • Figure 10 is a schematic view of the second frame of the micro DC motor shown in Figure 2;
  • Figure 11 is a schematic view of the iron core of the micro DC motor shown in Figure 2;
  • 10-mini DC motor 20- bottom cover, 21-block, 30-bearing seat, 31-first bearing groove, 32-card slot, 33-arc block, 40-shell, 41-second bearing groove, 50-support frame, 51-first frame body, 52-second frame body, 53-first mounting groove, 54-first winding groove, 55-second mounting groove, 56-second winding groove, 60 - permanent magnet, 70-coil, 80-output shaft, 81-lower bearing, 82-upper bearing, 90-iron core, 91-sleeve, 92-swing arm, 93-arc slot, 94-forced surface .
  • a micro DC motor 10 is mainly used for an electric toothbrush as a power source of the electric toothbrush according to a preferred embodiment of the present invention.
  • the micro DC motor 10 includes a bottom cover 21, a receiving seat 30 mounted on the bottom cover 20, a housing 40 mounted on the receiving base 30, a support frame 50 mounted in the housing 40, and four permanent mounted on the support frame 50.
  • each of the two permanent magnets 60 is symmetrically located on the side of the support frame 50, and the center of the two permanent magnets 60 on the same side of the support frame 50 forms an angle with the axis of the output shaft 80. ° ⁇ 60 °.
  • the bottom cover 20 protrudes from the two blocks 21 , and the block 21 is engaged with the receiving seat 30 , and the bottom cover 20 protects the receiving seat 30 .
  • the socket 30 is provided with a first bearing slot 31 and a second slot 32.
  • the first bearing slot 31 receives one end of the output shaft 80, and the slot 32 extends toward the bottom cover 20.
  • the slot 32 and the slot 32 are The blocks 21 are relatively adapted one by one.
  • the socket 30 protrudes from the two arcuate blocks 33, and the arcuate block 33 abuts against the inner wall of the outer casing 40, thereby restricting the socket 30 from rotating freely.
  • the outer casing 40 is provided with a second bearing groove 41, and the second bearing groove 41 is located at an end of the outer casing 40 away from the bottom cover 20.
  • the support frame 50 includes a first frame body 51 and a second frame body 52 , and one ends of the first frame body 51 and the second frame body 52 abut against the sockets 30 .
  • the first frame 51 is provided with a first mounting groove 53 and a first winding groove 54.
  • the first mounting groove 53 extends longitudinally to accommodate the permanent magnet 60.
  • the first winding groove 54 extends laterally to accommodate the coil 70.
  • the second frame 52 is provided with a second mounting groove 55 and a second winding groove 56.
  • the second mounting groove 55 extends longitudinally to receive the permanent magnet 60 and is opposite to the first mounting groove 53.
  • the second winding groove 56 is opposite to the first mounting groove 53.
  • the coil 70 is laterally extended and opposed to the second winding groove 54.
  • the first frame 51 and the second frame 52 are both mounted with two permanent magnets 60, wherein the two permanent magnets 60 of the first bracket 51 are symmetrically disposed with each other, and the second bracket The two permanent magnets 60 on 52 are symmetrically arranged to each other.
  • the permanent magnets 60 on the first frame body 51 are disposed opposite to the permanent magnets 60 on the second frame body 52, and the clamps formed by the center of the permanent magnets 60 and the axis of the output shaft 80 are disposed opposite each other.
  • the angle is 50° to 60°, and in one embodiment, the included angle is 54°.
  • N pole of permanent magnet 60 on first frame 51 Along from the direction of the core 90, the S pole faces the core 90, and the N pole of the permanent magnet 60 on the second frame 52 faces the core 90, and the S pole is away from the core 90.
  • the output shaft 80 is mounted with a lower bearing 81 and an upper bearing 82.
  • the lower bearing 81 is located on the receiving seat 30, and the upper bearing 82 is located on the outer casing 40. Specifically, the lower bearing 81 is received in the first bearing groove 31.
  • the upper bearing 82 is received in the second bearing groove 41.
  • the output shaft 80 can be rotated at a high speed by the iron core 90 by the support of the lower bearing 81 and the upper bearing 82.
  • the iron core 90 includes a sleeve portion 91 sleeved on the output shaft 80 and a swing arm 92 symmetrically disposed on opposite sides of the sleeve portion 91 .
  • the swing arm 92 is disposed opposite to the permanent magnet 60 .
  • the swing arm 92 is generally T-shaped, and the swing arm 92 is provided with an arcuate groove 93 and two force receiving surfaces 94.
  • the two force receiving surfaces 94 are symmetrically located on both sides of the arcuate groove 93 and are disposed opposite to the permanent magnet 60. Since the force receiving surface 94 is a curved surface and the force receiving area is large, the magnetic force generated by the permanent magnet 60 is easily transmitted to the output shaft 80.
  • the output shaft 80 is inserted into the iron core 90, and the first frame body 51 and the second frame body 52 are fastened to wrap the assembled iron core 90, and the first frame body 51 is first.
  • a permanent magnet 60 is mounted on the mounting groove 53 and the second mounting groove 55 of the second frame 52, and the coil 70 is wound around the first frame 51 and the second frame 52.
  • it is integrally mounted in the outer casing 40, and the lower bearing 81 and the upper bearing 82 are mounted on the output shaft 80, the receiving seat 30 is fastened, and the bottom cover 20 is finally buckled.
  • the micro DC motor 10 includes a bottom cover 20, a receiving seat 30 mounted on the bottom cover 20, a housing 40 mounted on the receiving base 30, a support frame 50 mounted in the housing 40, and four mounted on the support frame 50.
  • the iron core 90 becomes the excitation core under the action of the magnetic field after the energization, and the magnetic core 90 acts on the magnetic field of the permanent magnet 60. Swinging left and right to drive the output shaft 80 to swing left and right.
  • the permanent magnet 60 Because two permanent magnets are located on the same side of the support frame 50.
  • the angle between the center of 60 and the axis of the output shaft 80 is 50° to 60°. According to the cosine theorem, the permanent magnet 60 generates a large auxiliary force, the force stroke is sufficient, the swing amplitude is large, and the current direction is changed. There is no need to use the return spring in the gap to compensate for the lack of neutral power of the circuit switching, and the structure is simple and the noise is small.
  • the frequency of the micro DC motor 10 is 300-500 Hz, and the jitter of the output shaft 80 can be as high as 30,000 to 50,000 times per minute, which can cause a large amount of tiny bubbles to be generated in the toothpaste and water mixture in the mouth, and the pressure generated when the bubble bursts. You can deepen your teeth to clean the dirt and brush your teeth.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dc Machiner (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

一种微型直流电机（10），包括底盖（20）、承接座（30）、安装于承接座（30）上的外壳（40）、安装于外壳（40）内的支撑架（50）、安装于支撑架（50）上的四个永磁体（60）及线圈（70）、安装于承接座（30）上且伸出于外壳（40）外部的输出轴（80）、安装于输出轴（80）上的铁芯（90）。每两个永磁体（60）为一组对称位于支撑架（50）的侧面上，位于支撑架（50）同一侧面上的两个永磁体（60）的中心与输出轴（80）的轴心连线形成的夹角为50°～60°。铁芯（90）包括套于输出轴（80）上套接部（91）、对称设于套接部（91）两侧的摆臂（92），摆臂（92）与永磁体（60）相对设置。该微型直流电机（10）中永磁体（60）的产生辅助力大，受力行程足够，摆动幅度较大，在电流方向转变的间隙中不需要借助复位弹簧来弥补电路切换的空档动力不足的情况，也无须在结构上通过电流换向器来实现电流的方向，结构简单，噪音小。

Description

微型直流电机 技术领域
本发明涉及本发明涉及电动牙刷配件技术领域，特别是涉及一种微型直流电机。
背景技术
随着社会的不断发展，生活水平的不断提高，电动牙刷已近越来越受到人们的青睐，电动牙刷主要由可充电电池、微型直流电机、电池盒、牙刷头、金属护板及套筒组成。与传统的手动牙刷相比，电动牙刷在电力驱动下，刷头一每分钟几千次乃至上万次的速度运动，振动效率远高于手动牙刷。电动牙刷实现振动的微型直流电机为两种，一种是直流旋转电机加偏心轮变成振动电机，另一种是在电路上通过转换器控制使电机左右摆动，动力轴的中间连接弹簧回弹结构来保证电路切换的空档弥补动能不足。上述两种电机的实现方式结构较为复杂，制成成本较高，工作运行时摩擦噪音较大。
发明内容
基于此，有必要针对电动牙刷中电机存在的问题，提供一种结构简单、噪音小的微型直流电机。
一种微型直流电机，包括：底盖、安装于所述底盖上的承接座、安装于所述承接座上的外壳、安装于所述外壳内的支撑架、安装于所述支撑架上的四个永磁体及线圈、安装于所述承接座上且伸出于所述外壳外部的输出轴、 安装于所述输出轴上的铁芯；每两个所述永磁体为一组对称位于所述支撑架的侧面上，位于所述支撑架同一侧面上的两个所述永磁体的中心与所述输出轴的轴心连线形成的夹角为50°～60°；所述铁芯包括套于所述输出轴上套接部、对称设于所述套接部两侧的摆臂，所述摆臂与所述永磁体相对设置。
上述微型直流电机，包括底盖、安装于底盖上的承接座、安装于承接座上的外壳、安装于外壳内的支撑架、安装于支撑架上的四个永磁体及线圈、安装于承接座上且伸出于外壳外部的输出轴、安装于输出轴上的铁芯。使用时，通过交替改变线圈的电流方向，铁芯在通电后的磁场作用下变成励磁铁芯，铁芯在永磁体的磁场作用下左右摆动从而带动输出轴左右摆动。因为位于支撑架同一侧面上的两个永磁体的中心与输出轴的轴心连线形成的夹角为50°～60°，根据余弦定理永磁体的产生辅助力大，受力行程足够，摆动幅度较大，在电流方向转变的间隙中不需要借助复位弹簧来弥补电路切换的空档动力不足的情况，结构简单、噪音小。
在其中一个实施例中，所述输出轴上安装有下轴承及上轴承，所述下轴承位于所述承接座上，所述上轴承位于所述外壳上。
在其中一个实施例中，所述承接座上设有设一第一轴承槽及二卡槽，所述第一轴承槽容置所述下轴承，所述卡槽向所述底盖延伸。
在其中一个实施例中，所述底盖上凸伸出二卡块，所述卡块与所述卡槽一一相对适配。
在其中一个实施例中，所述承接座上凸伸出二弧形块，所述弧形块与所述外壳的内壁抵接。
在其中一个实施例中，所述线圈的出线头自所述底盖穿出。
在其中一个实施例中，所述摆臂上设有一弧形槽及二受力面，二所述受 力面对称位于所述弧形槽的两侧且与所述永磁体一一相对设置。
在其中一个实施例中，，所述支撑架包括第一架体及第二架体，所述第一架体及第二架体的一端与所述承接座抵接。
在其中一个实施例中，所述第一架体上设有第一安装槽及第一绕线槽，所述第一安装槽纵向延伸容置所述永磁体，所述第一绕线槽横向延伸容置所述线圈。
在其中一个实施例中，所述第二架体上设有第二安装槽及第二绕线槽，所述第二安装槽纵向延伸容置所述永磁体且与所述第一安装槽一一相对，所述第二绕线槽横向延伸容置所述线圈且与所述第一绕线槽一一相对。
附图说明
图1为本发明一较佳实施例微型直流电机的示意图；
图2为图1所示微型直流电机的分解示意图；
图3为图1所示微型直流电机的剖视图；
图4为图1所示微型直流电机的另一剖视图；
图5为图4所示微型直流电机的另一剖视图；
图6为图2所示微型直流电机中底盖的示意图；
图7为图2所示微型直流电机中承接座的示意图；
图8为图2所示微型直流电机中外壳的示意图；
图9为图2所示微型直流电机中第一架体的示意图；
图10为图2所示微型直流电机中第二架体的示意图；
图11为图2所示微型直流电机中铁芯的示意图；
附图标注说明：
10-微型直流电机，20-底盖，21-卡块，30-承接座，31-第一轴承槽，32-卡槽，33-弧形块，40-外壳，41-第二轴承槽，50-支撑架，51-第一架体，52-第二架体，53-第一安装槽，54-第一绕线槽，55-第二安装槽，56-第二绕线槽，60-永磁体，70-线圈，80-输出轴，81-下轴承，82-上轴承，90-铁芯，91-套接部，92-摆臂，93-弧形槽，94-受力面。
具体实施方式
为了便于理解本发明，下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的较佳实施例。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本发明的公开内容的理解更加透彻全面。
需要说明的是，当元件被称为“固定于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。
请参照图1至图11，为本发明一较佳实施例的微型直流电机10，该微型直流电机10主要用于电动牙刷上，作为电动牙刷的动力源。微型直流电机10包括底盖21、安装于底盖20上的承接座30、安装于承接座30上的外壳40、安装于外壳40内的支撑架50、安装于支撑架50上的四个永磁体60及线圈70、安装于承接座30上且伸出于外壳40外部的输出轴80、安装于输出轴80上的铁芯90，线圈70的出线头自底盖20穿出，使用时，线圈70交替 改变方向通电，铁芯90在永磁体60的作用下摆动，从而使输出轴80不断摆动。其中，每两个永磁体60为一组对称位于支撑架50的侧面上，位于支撑架50同一侧面上的两个永磁体60的中心与输出轴80的轴心连线形成的夹角为50°～60°。
进一步地，参照图2和图6，所述底盖20上凸伸出二卡块21，卡块21与承接座30卡接，底盖20对承接座30起到保护作用。再参照图7，所述承接座30上设有一第一轴承槽31及二卡槽32，第一轴承槽31容置输出轴80的一端，卡槽32向底盖20延伸，卡槽32与卡块21一一相对适配。更进一步地，承接座30上凸伸出二弧形块33，弧形块33与外壳40的内壁抵接，限制承接座30不会随意转动。
进一步地，再次参照图8，所述外壳40上设有一第二轴承槽41，第二轴承槽41位于外壳40远离底盖20的端部。进一步地，再次参照图9和图10，支撑架50包括第一架体51及第二架体52，第一架体51及第二架体52的一端与承接座30抵接。第一架体51上设有第一安装槽53及第一绕线槽54，第一安装槽53纵向延伸容置永磁体60，第一绕线槽54横向延伸容置线圈70。第二架体52上设有第二安装槽55及第二绕线槽56，第二安装槽55纵向延伸容置永磁体60且与第一安装槽53一一相对，第二绕线槽56横向延伸容置线圈70且与第二绕线槽54一一相对。更进一步地，请参照图4和图5，第一架体51和第二架体52都安装有两个永磁体60，其中第一支架51的两个永磁体60相互对称设置，第二支架52上的两个永磁体60相互对称设置。第一架体51上的永磁体60与第二架体52上的永磁体60一一相对设置，每两个一一相对设置永磁体60的中心与输出轴80的轴心连线形成的夹角为50°～60°，在其中一实施例中，夹角为54°。第一架体51上永磁体60的N极 远离铁芯90方向，S极朝向铁芯90方向，第二架体52上永磁体60的N极朝向铁芯90方向，S极远离铁芯90方向。
进一步地，所述输出轴80上安装有下轴承81及上轴承82，下轴承81位于承接座30上，上轴承82位于外壳40上，具体地，下轴承81容置于第一轴承槽31内，上轴承82容置于第二轴承槽41内。输出轴80通过下轴承81、上轴承82的支撑作用可以在铁芯90的带动下高速转动。
进一步地，参照图11，所述铁芯90包括套于输出轴80上的套接部91、对称设于套接部91两侧的摆臂92，摆臂92与永磁体60相对设置。摆臂92整体呈T型设置，摆臂92上设有一弧形槽93及二受力面94，两块受力面94对称位于弧形槽93的两侧且与永磁体60一一相对设置，因为受力面94为弧形面，受力面积较大，极易将永磁体60产生的磁力传递给输出轴80。
所述微型直流电机10安装时将输出轴80穿入铁芯90，将第一架体51、第二架体52扣合包裹住装配好的铁芯90，在第一架体51的第一安装槽53上、第二架体52的第二安装槽55上安装永磁体60，并将线圈70绕在第一架体51、第二架体52上。之后一体安装于外壳40内，将下轴承81、上轴承82安装在输出轴80上，扣上承接座30，最后扣上底盖20。
上述微型直流电机10，包括底盖20、安装于底盖20上的承接座30、安装于承接座30上的外壳40、安装于外壳40内的支撑架50、安装于支撑架50上的四个永磁体60及线圈70、安装于承接座30上且伸出于外壳40外部的输出轴80、安装于输出轴80上的铁芯90。使用时，通过交替改变线圈70的电流方向，具体电流方向的交替改变通过控制芯片来控制，铁芯90在通电后的磁场作用下变成励磁铁芯，铁芯90在永磁体60的磁场作用下左右摆动从而带动输出轴80左右摆动。因为位于支撑架50同一侧面上的两个永磁体 60的中心与输出轴80的轴心连线形成的夹角为50°～60°，根据余弦定理永磁体60的产生辅助力大，受力行程足够，摆动幅度较大，在电流方向转变的间隙中不需要借助复位弹簧来弥补电路切换的空档动力不足的情况，结构简单，噪音小。该微型直流电机10的工作时的频率为300～500HZ，输出轴80的抖动可高达30000～50000次每分钟，可以让嘴巴里的牙膏和水混合物产生大量微小的气泡，气泡爆裂时产生的压力可以深入牙缝清洁污垢，刷牙效果好。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种微型直流电机，其特征在于，包括：底盖、安装于所述底盖上的承接座、安装于所述承接座上的外壳、安装于所述外壳内的支撑架、安装于所述支撑架上的四个永磁体及线圈、安装于所述承接座上且伸出于所述外壳外部的输出轴、安装于所述输出轴上的铁芯；每两个所述永磁体为一组对称位于所述支撑架的侧面上，位于所述支撑架同一侧面上的两个所述永磁体的中心与所述输出轴的轴心连线形成的夹角为50°～60°；所述铁芯包括套于所述输出轴上套接部、对称设于所述套接部两侧的摆臂，所述摆臂与所述永磁体相对设置。
  2. 根据权利要求1所述的微型直流电机，其特征在于，所述输出轴上安装有下轴承及上轴承，所述下轴承位于所述承接座上，所述上轴承位于所述外壳上。
  3. 根据权利要求2所述的微型直流电机，其特征在于，所述承接座上设有一第一轴承槽及二卡槽，所述第一轴承槽容置所述下轴承，所述卡槽向所述底盖延伸。
  4. 根据权利要求3所述的微型直流电机，其特征在于，所述底盖上凸伸出二卡块，所述卡块与所述卡槽一一相对适配。
  5. 根据权利要求3所述的微型直流电机，其特征在于，所述承接座上凸伸出二弧形块，所述弧形块与所述外壳的内壁抵接。
  6. 根据权利要求1所述的微型直流电机，其特征在于，所述线圈的出线头自所述底盖穿出。
  7. 根据权利要求1所述的微型直流电机，其特征在于，所述摆臂上设有 一弧形槽及二受力面，二所述受力面对称位于所述弧形槽的两侧且与所述永磁体一一相对设置。
  8. 根据权利要求1所述的微型直流电机，其特征在于，所述支撑架包括第一架体及第二架体，所述第一架体及第二架体的一端与所述承接座抵接。
  9. 根据权利要求8所述的微型直流电机，其特征在于，所述第一架体上设有第一安装槽及第一绕线槽，所述第一安装槽纵向延伸容置所述永磁体，所述第一绕线槽横向延伸容置所述线圈。
  10. 根据权利要求9所述的微型直流电机，其特征在于，所述第二架体上设有第二安装槽及第二绕线槽，所述第二安装槽纵向延伸容置所述永磁体且与所述第一安装槽一一相对，所述第二绕线槽横向延伸容置所述线圈且与所述第一绕线槽一一相对。
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