Motor and electric toothbrush

Abstract

The utility model discloses a motor and an electric toothbrush, and the motor comprises a stator assembly which is provided with a stator support, the stator support is provided with a limiting step, and the limiting step is provided with a buckle piece; the PCB is electrically connected with the stator assembly and provided with a magnetic field sensor and a bayonet, the PCB is located on the limiting step, and the buckling piece is clamped in the bayonet; the rotor assembly is coaxially arranged in the stator assembly, a rotating shaft is arranged in the rotor assembly, and a magnetic feedback piece is arranged at the end, close to the magnetic field sensor, of the rotating shaft; according to the motor, the PCB is directly installed on the limiting step of the stator support, an installation support does not need to be additionally arranged, the internal structure of the motor is simplified, and the PCB can be installed more conveniently only by placing the PCB on the limiting step and enabling the buckling piece to be clamped into the bayonet of the PCB.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a motor and an electric toothbrush. Background Art

[0002] A servo motor can control speed, and its position accuracy is very accurate. It can convert a voltage signal into torque and rotational speed to drive a controlled object. The rotational speed of the rotor of the servo motor is controlled by an input signal and can respond quickly. In an automatic control system, it is used as an actuator and has characteristics such as a small electromechanical time constant and high linearity. It can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft.

[0003] In addition to structures such as a stator and a rotor, a traditional brushless motor with a magnetic field sensor also has a structure for installing the magnetic field sensor. The magnetic field sensor on the bracket senses the movement of the rotor and transmits the movement signal to the upper system, so as to achieve the purpose of controlling the rotational speed and direction of the rotor. However, additionally setting a structure for installing the magnetic field sensor will make the structure more complex and inconvenient to install. Summary of the Utility Model

[0004] In order to overcome the disadvantages of the prior art that in addition to structures such as a stator and a rotor, a traditional brushless motor with a magnetic field sensor also has a structure for installing the magnetic field sensor. The magnetic field sensor on the bracket senses the movement of the rotor and transmits the movement signal to the upper system, so as to achieve the purpose of controlling the rotational speed and direction of the rotor. However, additionally setting a structure for installing the magnetic field sensor will make the structure more complex and inconvenient to install.

[0005] In a first aspect

[0006] The utility model provides a motor, comprising:

[0007] A stator assembly, provided with a stator bracket, on which a limiting step is arranged, and a buckle is arranged on the limiting step;

[0008] A PCB board, which is electrically connected to the stator assembly, is provided with a magnetic field sensor and a bayonet. The PCB board is located on the limiting step, and the buckle is clamped in the bayonet;

[0009] A rotor assembly, coaxially arranged inside the stator assembly. A rotating shaft is arranged inside the rotor assembly, and a magnetic feedback member is arranged at one end of the rotating shaft close to the magnetic field sensor.

[0010] Optionally, the stator assembly further includes a stator core, and the stator core is installed on the stator bracket.

[0011] Optionally, the rotor assembly further includes a rotor magnet and a rotor bracket. The rotor bracket is sleeved on the rotating shaft, and the rotor magnet is installed on the rotor bracket.

[0012] Optionally, the magnetic field sensor includes two Hall sensors, the two Hall sensors are orthogonally installed on the PCB board, the magnetic feedback member includes a magnetic ring, and there is a gap between the magnetic ring and the Hall sensors.

[0013] Optionally, the width of the gap is 0.3 - 1.5 mm.

[0014] Optionally, a limit ring is installed on the rotating shaft, and the magnetic ring is fixed on the limit ring.

[0015] Optionally, it includes a housing, and the stator assembly and the rotor assembly are installed in the housing.

[0016] Optionally, front end covers and rear end covers are provided at both ends of the housing. Bearing holes are provided on the front end cover and the rear end cover. Bearings are provided in the bearing holes. The rotating shaft is arranged on the bearings and one end of the rotating shaft passes through the bearing hole and is exposed outside the housing.

[0017] Optionally, an elastic member is provided on the rear end cover, a connecting member is provided on the rotating shaft, and the connecting member connects the elastic member.

[0018] In a second aspect

[0019] The present utility model provides an electric toothbrush, including the motor described in the first aspect.

[0020] The beneficial effects of the present utility model are as follows: Place the PCB board on the limiting step of the stator bracket, and snap the snap member into the bayonet of the PCB board, so that the PCB board is fixed on the stator bracket. Coaxially arrange the rotor assembly inside the stator assembly, set a magnetic field feedback member on the rotating shaft of the rotor assembly, and make the magnetic field feedback member close to the magnetic field sensor. The magnetic feedback member can rotate with the rotating shaft. After the stator assembly is powered on to generate a magnetic field, when the rotor assembly senses the magnetic field generated by the stator assembly, the rotating shaft rotates inside the rotor assembly. After the rotating shaft rotates, it drives the magnetic feedback member to rotate. The magnetic feedback member generates its own magnetic field. The rotating magnetic feedback member generates a magnetic field. The magnetic sensing assembly senses the magnetic field generated by the rotating magnetic feedback member and converts the displacement-changing magnetic field signal into an electrical signal to control the magnetic field generated by the stator assembly, thereby achieving the control of the rotation speed or direction of the rotating shaft. By using the magnetic feedback member to transmit the displacement signal, that is, the magnetic field generated during the rotation process, the magnetic field sensor can sense this displacement signal, which can more accurately obtain the displacement signal, realize better control of the rotation speed or direction of the rotating shaft, and at the same time, the structure is simpler and the cost is lower. The PCB board is directly installed on the limiting step of the stator bracket without the need to additionally set up an installation bracket, which simplifies the internal structure of the motor. When installing the PCB board, it is more convenient, only need to place the PCB board on the limiting step and snap the snap member into the bayonet of the PCB board. Description of the Drawings

[0021] The present utility model will be further described below with reference to the drawings and embodiments.

[0022] Figure 1 is the assembly schematic diagram in some embodiments;

[0023] Figure 2 is the cross-sectional view in some embodiments;

[0024] Figure 3 is the structure explosion diagram in some embodiments;

[0025] Figure 4 is the schematic diagram of some parts of the structure in some embodiments.

[0026] Description of the reference numerals: 101, stator core; 201, rotor magnet; 202, rotating shaft; 301, magnetic field feedback member; 102, stator bracket; 103, cover body; 104, main bracket; 105, mounting hole; 106, mounting sleeve; 107, PCB board; 108, Hall sensor; 203, rotor mounting frame; 401, housing; 402, front end cover; 403, rear end cover; 404, elastic member; 405, connecting member; 112, limiting step; 122, snap member; 302, limiting ring. Detailed Embodiments

[0027] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.

[0028] The utility model provides a motor, which can be connected to other devices as a driving device to drive other devices to rotate. Devices that need to be rotated in industrial production and wheels in vehicles can be driven by the motor. The motor includes: a stator component, which is provided with a stator bracket 102, and a limit step 112 is provided on the stator bracket 102, and a clip 122 is provided on the limit step 112; a PCB board 107, which is electrically connected to the stator component, and is provided with a magnetic field sensor and a clip, the PCB board 107 is located on the limit step 112, and the clip is clipped in the clip; a rotor component, which is coaxially arranged in the stator component, and a rotating shaft is provided in the rotor component, and a magnetic feedback component is provided at one end of the rotating shaft close to the magnetic field sensor. Among them, the stator component is used to generate a magnetic field after power is turned on, the rotor component is used to sense the magnetic field generated by the stator core 101 and then rotate, the magnetic field sensor is used to sense the magnetic field, and the magnetic feedback component 301 is a component with its own magnetism, which is used to feed back the magnetic field to the magnetic field sensor.

[0029] During implementation, place the PCB board on the limiting step of the stator bracket, and engage the buckle into the bayonet of the PCB board, so that the PCB board is fixed on the stator bracket. Coaxially arrange the rotor assembly inside the stator assembly, set a magnetic field feedback component on the rotating shaft of the rotor assembly, and make the magnetic field feedback component 301 close to the magnetic field sensor. The magnetic feedback component 301 can rotate with the rotating shaft 202. After the stator assembly is powered on to generate a magnetic field, after the rotor assembly senses the magnetic field generated by the stator assembly, the rotating shaft 202 rotates inside the rotor assembly. After the rotating shaft 202 rotates, it drives the magnetic feedback component 301 to rotate. The magnetic feedback component 301 generates its own magnetic field. The rotating magnetic feedback component 301 generates a magnetic field. The magnetic sensing assembly senses the magnetic field generated by the rotating magnetic feedback component 301 and converts the magnetic field signal with displacement changes into an electrical signal to control the magnetic field generated by the stator assembly, thereby achieving the control of the rotation speed or direction of the rotating shaft 202. By using the magnetic feedback component 301 to transmit the displacement signal, that is, the magnetic field generated during the rotation process, the magnetic field sensor can sense this displacement signal, which can more accurately obtain the displacement signal and achieve better control of the rotation speed or direction of the rotating shaft 202. At the same time, the structure is simpler, the cost is lower. Directly install the PCB board on the limiting step of the stator bracket, without the need to separately set up an installation bracket, which simplifies the internal structure of the motor. When installing the PCB board, it is more convenient, just place the PCB board on the limiting step and engage the buckle into the bayonet of the PCB board.

[0030] Specifically, a plurality of buckles are provided on the stator bracket. The buckle includes a main body and a clamping head. The main body part is connected to the limiting step. The distance between the clamping head and the limiting step is equal to the thickness of the PCB board. A plurality of bayonets are provided on the PCB board 107. The positions and quantities of the buckles correspond to those of the bayonets. After the PCB board is placed on the limiting step, the main body of the buckle will be engaged into the buckle, and the clamping head of the buckle will abut against the surface of the PCB board, thus realizing the fixation of the PCB board on the stator bracket. The magnetic field sensor can be one of a Hall sensor 108, a magnetoresistive sensor, and a magnetic induction sensor. Magnetic field induction is realized through one of the magnetic field sensors. The magnetic feedback component 301 is a permanent magnet, and the permanent magnet can be a magnetic block or a magnetic ring. The motor provided in this embodiment is an inner-rotor magnet 201 motor, and the rotor assembly is located inside the stator assembly. The rotating shaft 202 rotates inside the stator assembly; positioning on the stator bracket.

[0031] In some embodiments, the stator assembly further includes a stator core, and the stator core is installed on the stator bracket.

[0032] During implementation, install the stator core 101 into the stator bracket. The stator bracket is used to fix the stator core 101 to make the stator core 101 stable. The stator core is used to install windings that generate a magnetic field when energized.

[0033] Specifically, the stator bracket includes two cover bodies 103 and a main bracket 104. The two cover bodies 103 are respectively arranged at both ends of the main bracket 104. A plurality of mounting holes 105 are provided on the main bracket 104. A stator core 101 is installed in each mounting hole 105. An installation sleeve 106 is provided on each cover body 103. The installation sleeve 106 has an installation groove inside. The stator core 101 is in a strip shape, and the sizes of both ends of the stator core 101 are the same as those of the installation groove. The outer wall size of the installation sleeve 106 is slightly smaller than that of the mounting hole 105. When the cover body 103 covers the main bracket 104, the installation sleeve 106 will be located inside the mounting hole 105, the stator core 101 is located inside the mounting hole 105, and both ends of the stator core 101 are respectively located inside the installation sleeves 106 of the two cover bodies 103 at both ends. The mounting holes 105 are arranged in a ring on the main bracket 104. Correspondingly, the installation sleeves 106 are arranged in a ring on the cover body 103. After the stator cores 101 are installed on the stator bracket, they are also arranged in a ring. There is a cavity inside the main bracket 104, and the rotor assembly is installed in the cavity. Usually, a winding coil is provided on the stator core 101, and a magnetic field is generated after the winding coil is energized.

[0034] In some embodiments, the rotor assembly further includes a rotor magnet 201 and a rotor bracket. The rotor bracket is sleeved on the rotating shaft, and the rotor magnet is installed on the rotor bracket.

[0035] During implementation, the rotor bracket 203 is installed on the rotating shaft 202, and then the rotor magnet 201 is installed on the rotating shaft 202. The rotor bracket 203 plays a role in supporting and fixing the device. After the rotor magnet 201 senses the magnetic field generated by the stator core 101, it drives the rotor bracket 203 to drive the rotating shaft 202 to rotate.

[0036] Specifically, four installation grooves are provided on the rotor bracket 203. The four installation grooves are arranged in a ring on the rotor bracket 203. A rotor magnet 201 is installed in each installation groove. There is a through hole on the rotor bracket 203, and the rotor bracket 203 is sleeved on the rotating shaft 202 through the through hole.

[0037] In some embodiments, the magnetic field sensor includes two Hall sensors. The two Hall sensors are orthogonally installed on the PCB board. The magnetic feedback member includes a magnetic ring, and there is a gap between the magnetic ring and the Hall sensor.

[0038] During implementation, two Hall sensors 108 are orthogonally mounted on the PCB board 107. The Hall sensors 108 are used to sense the changing magnetic field fed back by the magnetic ring. The Hall sensors 108 then change the current on the PCB board 107, thereby achieving the change of the rotation speed or rotation direction of the rotating shaft. By using two Hall sensors 108 to sense the magnetic field fed back by the magnetic feedback member 301, the magnetic field can be sensed more accurately and the electrical signal can be transmitted. Moreover, directly mounting the Hall sensors 108 on the PCB board 107 can reduce the internal space utilization rate and make the overall structure simpler.

[0039] Specifically, two Hall sensors 108 are orthogonally mounted on the PCB board 107, that is, the linear distance from each Hall sensor 108 to the center of the PCB board 107 is the same and the angle between the two straight lines is 90°.

[0040] In some cases, the magnetic field sensor includes four Hall sensors 108. The four Hall sensors 108 are distributed in a cross shape with the PCB board 107 as the center. The magnetic feedback member 301 can also be a plurality of magnetic blocks arranged around the rotating shaft 202 to form a magnetic ring surrounded by multiple magnetic blocks.

[0041] In some embodiments, the width of the gap is 0.3 - 1.5 mm.

[0042] During implementation, the magnetic ring is mounted on the rotating shaft 202 and the magnetic ring is located on one side of the Hall sensor 108. After installation, there is a gap between the magnetic feedback members 301. The width of the gap is in the range of 0.3 - 1.5 mm. Such a gap width can best make the magnetic field change fed back by the magnetic feedback member 301 be transmitted to the Hall sensor 108 more accurately, and finally achieve precise control of the rotation speed, torque or rotation direction of the rotor magnet 201.

[0043] Specifically, in this embodiment, the width of the gap is set to 0.5 mm.

[0044] In some embodiments, a limiting ring is mounted on the rotating shaft, and the magnetic ring is fixed on the limiting ring.

[0045] During implementation, the limiting ring is sleeved on the rotating shaft. Similarly, the magnetic ring is also sleeved on the rotating shaft, and the magnetic ring is fixed on the limiting ring. The limiting ring plays a role in limiting and fixing the magnetic ring.

[0046] Specifically, the limiting ring is a copper ring, and the magnetic ring is adhered to the limiting ring with glue.

[0047] In some embodiments, it includes a housing 401, and the stator assembly and the rotor assembly are mounted in the housing 401.

[0048] During implementation, the stator assembly and the rotor assembly are installed inside the housing 401, and the housing 401 plays a role in protecting the stator assembly and the rotor assembly.

[0049] In some embodiments, front end covers 402 and rear end covers 403 are provided at both ends of the housing 401. Bearing holes are provided on the front end covers 402 and the rear end covers 403. Bearings are provided in the bearing holes. The rotating shaft 202 is arranged on the bearings and one end of the rotating shaft 202 passes through the bearing hole of the front end cover 402 and is exposed outside the housing 401.

[0050] During implementation, after the stator assembly and the rotor assembly are installed inside the housing 401, the front end covers 402 and the rear end covers 403 are installed at both ends of the housing 401, so that the rotating shaft 202 on the rotor assembly is installed on the bearings, and one end of the rotating shaft 202 passes through the bearing hole of the front end cover 402 and is exposed outside the housing 401. The front end covers 402 and the rear end covers 403 are used to further ensure the airtightness inside the housing 401, preventing flying dust or other substances on the outer wall from entering the housing 401 and affecting the working state of the stator assembly and the rotor assembly. One end of the rotating shaft 202 exposed outside the housing 401 is used to connect other devices that need to be driven. The rotating shaft 202 is driven to rotate by the stator assembly and the rotor assembly. One end of the rotating shaft 202 is connected to the device that needs to be driven, driving the device that needs to be driven to rotate, achieving the purpose of driving other devices.

[0051] In some embodiments, an elastic member 404 is provided on the rear end cover 403. A connecting member 405 is provided on the rotating shaft 202, and the connecting member 405 is connected to the elastic member 404.

[0052] During implementation, the elastic member 404 is installed on the rear end cover 403, and the connecting member 405 on the rotating shaft 202 is connected to the elastic member 404. When the rotating shaft 202 rotates and may be collided by other objects, it may move forward and backward. The cooperation between the elastic member 404 and the connecting member 405 can play a buffering role for the rotating shaft 202.

[0053] Specifically, the elastic member 404 is a spring, the connecting member 405 is an annular plate, the annular plate is fixed on the rotating shaft 202, one end of the spring is connected to the rear end cover 403, and the other end is connected to the annular plate. When the rotating shaft 202 moves, the connecting plate will squeeze the spring or the spring will push the connecting plate.

[0054] In some cases, the elastic member 404 can also be elastic rubber, and the connecting member 405 can also be structures such as a connecting block or a connecting column.

[0055] The present utility model also provides an electric toothbrush, including the motor in the above embodiments. The detailed structure of the motor has been described in detail in the above embodiments and will not be elaborated here.

[0056] The above is a specific description of the preferred embodiment of the present utility model. However, the present utility model is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present utility model. These equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A motor, characterized in that: include: The stator assembly is provided with a stator bracket, a limiting step is provided on the stator bracket, and a snap fastener is provided on the limiting step; A PCB board, which is electrically connected to the stator assembly and is provided with a magnetic field sensor and a bayonet, wherein the PCB board is located on the limiting step, and the fastener is clamped in the bayonet; The rotor assembly is coaxially arranged in the stator assembly. A rotating shaft is arranged in the rotor assembly. A magnetic feedback member is arranged at one end of the rotating shaft close to the magnetic field sensor.

2. The motor according to claim 1, characterized in that The stator assembly also includes a stator core, and the stator core is installed on the stator bracket.

3. The motor according to claim 2, characterized in that The rotor assembly also includes a rotor magnet and a rotor bracket. The rotor bracket is sleeved on the rotating shaft, and the rotor magnet is mounted on the rotor bracket.

4. The motor according to claim 1, characterized in that The magnetic field sensor comprises two Hall sensors, which are orthogonally mounted on a PCB board. The magnetic feedback component comprises a magnetic ring, and a gap is provided between the magnetic ring and the Hall sensors.

5. The motor according to claim 4, characterized in that The width of the gap is 0.3-1.5 mm.

6. The motor according to claim 4, characterized in that A limiting ring is arranged on the rotating shaft, and the magnetic ring is fixed on the limiting ring.

7. The motor according to claim 1, characterized in that It comprises a shell, in which the stator assembly and the rotor assembly are installed.

8. The motor according to claim 7, characterized in that The two ends of the shell are provided with a front cover and a rear cover, the front cover and the rear cover are provided with bearing holes, the bearing holes are provided with bearings, the rotating shaft is arranged on the bearings and one end of the rotating shaft passes through the bearing hole and is exposed outside the shell.

9. The motor according to claim 8, characterized in that An elastic member is disposed on the rear end cover, and a connecting member is disposed on the rotating shaft, wherein the connecting member is connected to the elastic member.

10. An electric toothbrush, characterized in that: A motor comprising any one of claims 1 to 9.

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