Motor for electric toothbrush and electric toothbrush

Abstract

The utility model discloses a motor for an electric toothbrush and the electric toothbrush. The motor comprises a stator, a rotor and a detection assembly. The stator comprises a stator shell and a first electromagnetic induction piece fixed in the stator shell. The rotor comprises a rotor shaft and a second electromagnetic induction piece, the rotor shaft comprises a main body section and an extension section, the main body section is located in the stator shell, the extension section extends out of the stator shell, and the second electromagnetic induction piece is arranged on the main body section; the detection assembly comprises a first detection piece and a second detection piece, the first detection piece is arranged outside the stator shell and is fixed relative to the stator shell, and the second detection piece is arranged on the extending section of the rotor shaft and corresponds to the first detection piece in position. According to the motor for the electric toothbrush, the influence of the magnetic field of the motor on the Hall element can be reduced, and the detection accuracy is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric toothbrushes, and in particular to a motor for an electric toothbrush and an electric toothbrush. Background Art

[0002] Electric toothbrushes have obvious advantages over traditional manual toothbrushes in terms of functionality and user experience, such as better cleaning effects and more convenient use, and therefore are favored by more and more consumers.

[0003] The power component of an electric toothbrush usually uses an electric motor, also known as a motor. The motor usually has a rotor and a stator. The rotor and the stator rotate the stator through the principle of electromagnetic induction, thereby driving the brush head to rotate or vibrate. When it is necessary to detect the rotation angle of the rotor, a detection element can be set, but the detection element may be affected by the magnetic field of the motor, resulting in inaccurate detection. Utility Model Content

[0004] The present application discloses a motor for an electric toothbrush and an electric toothbrush, which can reduce the influence of the magnetic field of the motor on the detection component and improve the detection accuracy.

[0005] In order to achieve the above objectives, in a first aspect, the present application discloses a motor for an electric toothbrush, comprising:

[0006] The stator comprises a stator shell and a first electromagnetic induction member fixed in the stator shell;

[0007] A rotor, comprising a rotor shaft and a second electromagnetic induction component, wherein the rotor shaft is rotatably connected to the stator shell, the rotor shaft comprises a main section and an extension section, the main section is located inside the stator shell, and the extension section extends outside the stator shell, the second electromagnetic induction component is arranged on the main section and has a gap with the inner wall of the end of the stator shell in the axial direction, the first electromagnetic induction component is one of a coil winding and a permanent magnet, and the second electromagnetic induction component is the other of the coil winding and the permanent magnet;

[0008] A detection component is used to detect the rotation angle of the rotor. The detection component includes a first detection component and a second detection component. The first detection component is arranged outside the stator shell and is relatively fixed to the stator shell. The second detection component is arranged on the extended section of the rotor shaft and corresponds to the position of the first detection component.

[0009] The motor for an electric toothbrush provided in the embodiment of the present application enables the first detection component and the second detection component to be located outside the stator shell, thereby being isolated from the first electromagnetic induction component and the second electromagnetic induction component in the stator shell, thereby preventing the magnetic field generated by the first electromagnetic induction component and the second electromagnetic induction component from affecting the detection component, thereby improving the detection accuracy.

[0010] In a possible implementation manner of the first aspect, the first detection member is a magnetic sensor, and the second detection member is a magnetic member; or the first detection member is a magnetic member, and the second detection member is a magnetic sensor.

[0011] In a possible implementation manner of the first aspect, the magnetic sensor is a Hall sensor.

[0012] In a possible implementation of the first aspect, the motor further includes a mounting seat, which is fixed to the extended section of the rotor shaft and is axially spaced apart from the stator shell, and the second detection member is disposed on a side of the mounting seat away from the stator shell.

[0013] In a possible implementation manner of the first aspect, the mounting seat is a magnetic isolation member.

[0014] In a possible implementation of the first aspect, a protrusion is formed on a surface of the mounting seat facing away from the stator shell, and the protrusion is provided with a connecting through hole that cooperates with the rotor shaft, and the second detection piece is sleeved outside the protrusion and abuts against a surface of the mounting seat facing away from the stator shell.

[0015] In a possible implementation manner of the first aspect, a groove is formed on a surface of the mounting seat on one side facing away from the stator shell, the groove is arranged around the protrusion, and the second detection member is arranged in the groove.

[0016] In a possible implementation of the first aspect, the stator shell has an end cover at one end along the axial direction, and the end cover is provided with a through hole. The extended section of the rotor shaft extends out of the stator shell through the through hole, and a first gap is provided between the inner wall of the through hole and the outer wall of the rotor shaft, and the projection of the mounting seat on the end cover along the axial direction at least partially covers the first gap.

[0017] In a possible implementation of the first aspect, the motor further includes a base and a circuit board disposed on the base, the base is a hard part, the base is connected to one end of the stator shell close to the end cover, and the circuit board is spaced apart from the end of the extended section of the rotor shaft.

[0018] In a possible implementation manner of the first aspect, the first detection member is a magnetic sensor, the second detection member is a magnetic member, and the magnetic sensor is disposed on a surface of the circuit board facing the magnetic member.

[0019] In a possible implementation manner of the first aspect, the first detection component includes a plurality of magnetic sensors, and the plurality of magnetic sensors are uniformly arranged along the circumferential direction on a surface of the circuit board facing the magnetic component.

[0020] In a possible implementation manner of the first aspect, the coil winding has an outlet end, the outlet end is connected to a lead wire, the lead wire is arranged through an edge of the circuit board, and the magnetic sensor is arranged close to the center of the circuit board.

[0021] In a possible implementation of the first aspect, the circuit board includes a hard circuit board and a first flexible circuit board, the hard circuit board is arranged on the base, the magnetic sensor is arranged on the first flexible circuit board, and the first flexible circuit board is electrically connected to the hard circuit board.

[0022] In a possible implementation of the first aspect, the hard circuit board includes a first surface and a second surface arranged opposite to each other, the first surface faces the rotor shaft, a portion of the first flexible circuit board is adhered and fixed to the first surface, and the magnetic sensor is arranged on the surface of the first flexible circuit board facing the rotor shaft.

[0023] In a possible implementation manner of the first aspect, the circuit board further includes a second flexible circuit board, which is disposed on the second surface of the rigid circuit board and is electrically connected to the first flexible circuit board through a via hole penetrating the rigid circuit board.

[0024] In a possible implementation manner of the first aspect, a surface of the rigid circuit board used for mounting the magnetic sensor is parallel to a surface of the mounting base used for mounting the magnetic component.

[0025] In a possible implementation manner of the first aspect, the motor further includes a first bearing and a second bearing, and both ends of the main body section are rotatably connected to the stator housing through the first bearing and the second bearing, respectively.

[0026] In a possible implementation of the first aspect, a first locking member and a second locking member are further provided on the rotor shaft, the first locking member is axially abutted against the inner ring of the first bearing, the second locking member is axially abutted against the inner ring of the second bearing, and the first locking member and the second locking member are located between the first bearing and the second bearing.

[0027] In a possible implementation of the first aspect, the motor is a servo motor, and the servo motor includes a control circuit, the control circuit is electrically connected to the detection component, and the control circuit is electrically connected to the rotor or the stator, and the controller is at least configured to: control the rotor to oscillate back and forth around the rotor shaft with a reference position as the center in a preset manner, and control the rotor to rotate around the rotor shaft to switch the reference position in a preset manner.

[0028] In a second aspect, the present application further discloses an electric toothbrush, comprising the motor described in any implementation manner in the first aspect.

[0029] The electric toothbrush provided in the embodiment of the present application adopts the motor described in any one of the implementation methods of the first aspect above, and thus can reduce the influence of the magnetic field inside the motor on the detection component and improve the accuracy of rotor position detection, so that the brush head of the electric toothbrush can swing accurately and provide an efficient cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 is an exploded diagram of a motor provided in an embodiment of the present application;

[0032] Figure 2 is a cross-sectional view of a motor provided in an embodiment of the present application;

[0033] Figure 3 yes Figure 2 A magnified view of part A;

[0034] Figure 4 yes Figure 2 Enlarged view of part B.

[0035] Description of reference numerals:

[0036] 100-stator; 110-stator housing; 111-first electromagnetic induction component; 120-main housing; 130-end cover; 131-through hole;

[0037] 200- rotor; 210- rotor shaft; 211- main section; 212- extension section; 220- second electromagnetic induction member;

[0038] 300 - detection assembly; 310 - first detection member; 320 - second detection member; 321 - mounting seat;

[0039] 400-first bearing;

[0040] 500-second bearing;

[0041] 610-first locking member; 620-second locking member;

[0042] 700-base;

[0043] 800-circuit board; 810-rigid circuit board; 820-first flexible circuit board;

[0044] 900-lead. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] In this application, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0048] An electric toothbrush is a toothbrush that generates high-frequency vibrations by driving the brush head through the rapid rotation or vibration of the motor core. This high-frequency vibration can break down the toothpaste into fine foam and deeply clean the gaps between teeth. At the same time, the vibration of the bristles can promote blood circulation in the oral cavity and have a massage effect on the gum tissue. Electric toothbrushes generally include rotary electric toothbrushes and vibrating electric toothbrushes. Among them, rotary electric toothbrushes drive the brush head to rotate through the motor to enhance the friction effect. The brush head of a vibrating electric toothbrush can swing at a high frequency, thereby effectively cleaning the blind spots in the oral cavity.

[0049] An electric toothbrush mainly includes a battery, a motor, a brush head, and a movement, among which the motor is the power component of the electric toothbrush. It provides power to the toothbrush to make the brush head rotate or vibrate. The principle of the motor is to realize the conversion of electrical energy and mechanical energy through electromagnetic induction. In a vibrating electric toothbrush, a position detection element can be used to detect the rotor position information, so that the control circuit can accurately control the rotation direction and speed of the motor, thereby achieving precise swinging of the brush head and providing an efficient cleaning effect. However, the position detection element is usually arranged inside the stator housing and may be affected by the magnetic field inside the motor, resulting in inaccurate detection.

[0050] In view of this, the embodiments of the present application provide a motor for an electric toothbrush and an electric toothbrush, which can reduce the influence of the magnetic field of the motor on the position detection element and improve the detection accuracy.

[0051] The motor and the electric toothbrush for the electric toothbrush are described in detail below through specific embodiments:

[0052] In a first aspect, the present application provides a motor for an electric toothbrush, such as Figure 1 to Figure 3 As shown, the motor includes a stator 100, a rotor 200 and a detection assembly 300, wherein the stator 100 includes a stator housing 110 and a first electromagnetic induction member 111 fixed in the stator housing 110; the rotor 200 includes a rotor shaft 210 and a second electromagnetic induction member 220 fixed to the rotor shaft 210, and the rotor shaft 210 is rotatably connected to the stator housing 110, so that the rotor shaft 210 can rotate relative to the stator housing 110. The detection assembly 300 can be used to detect the position or rotation angle of the rotor, and the detection assembly 300 may include a first detection member 310 and a second detection member 320, wherein the first detection member 310 is relatively fixed to the stator housing 110, and the second detection member 320 is relatively fixed to the rotor shaft 210.

[0053] It should be noted that the first electromagnetic induction component 111 can be one of a coil winding and a permanent magnet, and the second electromagnetic induction component 220 can be the other of a coil winding and a permanent magnet. It can be set specifically according to the type of motor. For example, when the motor is a brushed motor, since the brushed motor uses brushes and commutators to alternately change the direction of the electromagnetic field, the motor rotor rotates. Therefore, the first electromagnetic induction component 111 relatively fixed to the stator housing 110 in the brushed motor can be a permanent magnet, and the second electromagnetic induction component 220 relatively fixed to the rotor shaft 210 can be a coil winding, and the brush is in contact with the coil winding and conducts electricity. The current can enter the coil through the brush, so that the coil generates a magnetic field, and the magnetic field interacts with the permanent magnet inside the stator housing 110, thereby driving the rotor to rotate. For another example, when the motor is a brushless motor, the brushless motor does not use brushes, but uses an electronic commutator to detect the position of the motor rotor and control the flow direction of the current, thereby realizing the rotation of the rotor. Therefore, the first electromagnetic induction member 111 fixed relative to the stator housing 110 in the brushless motor can be a coil winding, and the second electromagnetic induction member 220 fixed relative to the rotor shaft 210 can be a permanent magnet. When current passes through the coil winding on the stator, a magnetic field is generated, and the magnetic field interacts with the permanent magnet on the rotor, thereby driving the rotor to rotate.

[0054] In order to accurately control the rotation mode of the rotor, the above-mentioned motor can also use a servo motor. The main working principle of the servo motor is to achieve efficient and stable brushing based on a precise control and feedback system. In addition to the above components, the servo motor also includes a control circuit, which is electrically connected to the detection component 300 and electrically connected to the rotor 200 or the stator 100. The general process of its operation is as follows: when the user starts the electric toothbrush, the control circuit sends a start signal to the servo motor and supplies power to the servo motor. After receiving the start signal, the servo motor starts to run and converts electrical energy into mechanical energy, thereby generating a torque to drive the rotor 200 and the brush head to rotate. The detection component 300 can feedback the position and / or speed information of the rotor 200 in real time, and feed this information back to the control circuit. The control circuit compares this information with the target position and / or speed of the rotor 200, and then adjusts the speed or direction of the rotor 200 to ensure that the brush head can accurately move according to the preset parameters, so as to achieve the best cleaning effect.

[0055] In a possible implementation, the control circuit can control the rotor 200 to swing back and forth (i.e., vibrate) around the rotor shaft 210 with the reference position as the center in a preset manner. Since the rotor 200 is connected to the brush head, the rotor 200 can drive the brush head to swing back and forth with the reference position as the center when swinging back and forth, so that the brush head cleans the oral cavity in a high-frequency vibration manner. At the same time, in order to cover a wider cleaning area without changing the overall position of the electric toothbrush, the control circuit can also control the rotor 200 to rotate around the rotor shaft 210 and switch to different reference positions. So that the brush head can swing back and forth with different reference positions as the center. For example, at the first moment, the rotor 200 is located at the first reference position, and the control circuit can control the rotor 200 and the brush head to swing back and forth to both sides of the first reference position with the first reference position as the center to achieve high-frequency vibration. After the brush head has been oscillating back and forth at the first reference position for a preset period of time, the control circuit controls the rotor 200 to rotate circumferentially around the rotor shaft 210 to the second reference position. At this time, the control circuit controls the rotor 200 and the brush head to reciprocate on both sides of the second reference position with the second reference position as the center to achieve high-frequency vibration. After the brush head has been running at the second reference position for a preset period of time, the control circuit can continue to control the rotor 200 to switch to the next reference position. In this reciprocating manner, the vibration of the brush head at multiple different reference positions is achieved, thereby expanding the cleaning range and improving the cleaning effect while the user's holding posture remains unchanged.

[0056] It should be noted that the reciprocating swing and rotation of the rotor 200 are both rotational motions around the rotor shaft 210. The swing is mainly for achieving vibration of the brush head, while the rotation is mainly for adjusting the reference position of the brush head during vibration.

[0057] The detection component 300 can be implemented by a magnetic sensor. For example, the first detection member 310 can be a magnetic sensor, and the second detection member 320 can be a magnetic member. Alternatively, the first detection member 310 can be a magnetic member, and the second detection member 320 can be a magnetic sensor. The magnetic sensor can detect its relative position with the magnetic member, thereby realizing the detection of the position or rotation angle of the rotor. Specifically, the magnetic sensor can be implemented by a Hall sensor based on the Hall effect.

[0058] In order to prevent the magnetic field inside the stator housing 110 from affecting the detection accuracy of the detection assembly 300, as shown in FIG. Figure 3 , Figure 4 As shown, the rotor shaft 210 includes a main section 211 and an extension section 212, the main section 211 is located in the stator housing 110, the extension section 212 extends out of the stator housing 110, and the second electromagnetic induction member 220 is arranged in the main section 211 and corresponds to the first electromagnetic induction member 111 in the stator housing 110. The first detection member 310 is arranged outside the stator housing 110 and is relatively fixed to the stator housing 110, and the second detection member 320 is arranged in the extension section 212 of the rotor shaft 210 and corresponds to the position of the first detection member 310. In this way, the first detection member 310 and the second detection member 320 are both located outside the stator housing 110, thereby forming isolation from the first electromagnetic induction member 111 and the second electromagnetic induction member 220 in the stator housing 110, which can prevent the magnetic field generated by the first electromagnetic induction member 111 and the second electromagnetic induction member 220 from affecting the detection component 300, thereby improving the detection accuracy.

[0059] like Figure 3 As shown, in order to facilitate the installation of the second detection member 320 on the extension section 212 of the rotor shaft 210, a mounting seat 321 can be provided on the extension section 212 of the rotor shaft 210, and the second detection member 320 can be provided on the side of the mounting seat 321 away from the stator housing 110. Thus, the second detection member 320 can be stably installed on the rotor shaft 210. In addition, in the axial direction, the mounting seat 321 can be spaced apart from the stator housing 110, thereby preventing the position of the rotor shaft 210 from changing due to friction caused by the contact between the mounting seat 321 and the stator housing 110, thereby affecting the detection accuracy.

[0060] Furthermore, the mounting seat 321 can be set as a magnetic isolation member, so that the mounting seat 321 can isolate the magnetic field inside the motor, further avoiding the influence of the magnetic field inside the motor on the second detection member 320. Specifically, the mounting seat 321 can be made of a material with high magnetic permeability, such as iron, nickel-iron alloy, etc.

[0061] In addition, a protrusion (not shown in the figure) may be formed on the side surface of the mounting seat 321 away from the stator housing 110, and the protrusion is provided with a connecting through hole that cooperates with the rotor shaft 210. In this case, the second detection member 320 may be set as an annular structure and sleeved outside the protrusion. In this way, the second detection member 320 can be radially positioned. In addition, the second detection member 320 can also be abutted against the side surface of the mounting seat 321 away from the stator housing 110, thereby axially positioning the second detection member 320 so that the second detection member 320 is firmly mounted on the rotor shaft 210.

[0062] Furthermore, in order to save space when installing the second detection member 320, a groove may be formed on the surface of the mounting seat 321 on one side away from the stator housing 110, the groove is arranged around the protrusion, and at least a part of the second detection member 320 may be arranged in the groove. In this way, the axial space occupied by the second detection member 320 can be saved.

[0063] The structure of the stator case 110 can be implemented in a variety of ways. For example, the stator case 110 can be configured as two detachably connected parts, and the two parts can be connected axially or radially. In an axially connected implementation, such as Figure 3 As shown, the stator housing 110 includes a main housing 120 with one end open and an end cover 130 covering the open end of the main housing 120. The end cover 130 is provided with a through hole 131, through which the extension section 212 of the rotor shaft 210 extends out of the stator housing 110. There is a first gap between the inner wall of the through hole 131 and the outer wall of the rotor shaft 210, and the projection of the mounting seat 321 on the end cover 130 along the axial direction at least partially covers the first gap. For example, in Figure 3 In the illustrated solution, the outer diameter of the mounting seat 321 is larger than the inner diameter of the through hole 131, so that the projection of the mounting seat 321 along the axial direction on the end cover 130 completely covers the first gap. Thus, the mounting seat 321 can block the magnetic field at the first gap, thereby further improving the detection accuracy.

[0064] like Figure 3As shown, the motor also includes a base 700 and a circuit board 800 arranged on the base 700. The base 700 can be a hard part and connected to one end of the stator shell 110 close to the end cover 130. The circuit board 800 can be arranged at intervals with the end of the extension section 212 of the rotor shaft 210. The magnetic sensor can be arranged on the surface of the circuit board 800 facing the magnetic part. For example, the base 700 can be connected to the open end of the main housing 120 or the end cover 130 of the stator shell 110. Thus, the hard base 700 can provide sufficient strength support for the circuit board 800, and the base 700 and the stator shell 110 are connected to form a whole. When the rotor shaft 210 is subjected to the force of brushing teeth and drives the electric toothbrush to deform, the electric toothbrush as a whole deforms synchronously, which can avoid the relative position of the first detection member 310 and the second detection member 320 changing due to inconsistent deformation, thereby causing inaccurate detection.

[0065] It should be noted that the magnetic sensor can be provided by one or more. When there are multiple magnetic sensors, the multiple magnetic sensors are evenly arranged along the circumferential direction on the surface of the circuit board 800 facing the magnetic component. For example, when there are two magnetic sensors, the two magnetic sensors can respectively sense two different magnetic poles of the magnetic component to control the rotor shaft 210 to swing back and forth between the two magnetic sensors.

[0066] like Figure 3 As shown, the coil winding has an outlet terminal, and the outlet terminal is connected to a lead 900, which can be used to provide current to the coil winding. The lead 900 can be arranged through the edge of the circuit board 800, and the magnetic sensor can be arranged near the center of the circuit board 800, so that the lead 900 and the magnetic sensor are far away from each other in the radial direction. Since a certain magnetic field will be generated when a current is passed through the lead 900, keeping the lead 900 and the magnetic sensor away from each other can prevent the magnetic field generated by the lead 900 from affecting the detection result of the magnetic sensor, thereby further improving the accuracy of the detection.

[0067] There are many ways to implement the circuit board 800, for example, it can be implemented by using a hard circuit board, a flexible circuit board, or a combination of a hard circuit board and a flexible circuit board. In one implementation method of combining a hard circuit board and a flexible circuit board, Figure 1 , Figure 3 As shown, the circuit board 800 includes a hard circuit board 810 and a first flexible circuit board 820. The hard circuit board 810 is arranged on the base 700. The first flexible circuit board 820 is electrically connected to the hard circuit board 810. The magnetic sensor can be arranged on the first flexible circuit board 820 or on the hard circuit board 810.

[0068] Specifically, the hard circuit board 810 includes a first surface and a second surface disposed opposite to each other, wherein the first surface faces the rotor shaft 210. Figure 3 As shown, a portion of the first flexible circuit board 820 is attached and fixed to the first surface, and the magnetic sensor is disposed on the surface of the first flexible circuit board 820 facing the rotor shaft 210. Thus, the hard circuit board 810 can form a stable support for the magnetic sensor on the first flexible circuit board 820, preventing the position of the magnetic sensor from changing, thereby affecting the detection accuracy.

[0069] In another possible implementation of the circuit board 800, the circuit board 800 further includes a second flexible circuit board, which is disposed on the second surface of the rigid circuit board 810 and is electrically connected to the first flexible circuit board 820 through a via 131 that penetrates the rigid circuit board 810. Thus, the effective area of ​​the flexible circuit board can be increased, so that more electrical components and chips can be arranged, so that the electric toothbrush can support multiple functions, such as timing, speed regulation, connection with electronic devices, etc. In addition, the first flexible circuit board 820 and the second flexible circuit board are electrically connected through the metallized via 131 of the rigid circuit board 810, which can save the space occupied by the wire and make the electrical connection more stable.

[0070] Specifically, the surface of the hard circuit board 810 for mounting the magnetic sensor can be arranged in parallel with the surface of the mounting base 321 for mounting the magnetic component. Thus, the magnetic sensor and the magnetic component can be arranged in parallel, and the distance between the magnetic sensor and the magnetic component can be kept constant during the rotation of the rotor, so that the detection result is more accurate.

[0071] In order to make the rotation connection between the rotor shaft 210 and the stator housing 110 more stable, as Figure 1 , Figure 3 , Figure 4 As shown, the motor further includes a first bearing 400 and a second bearing 500, and both ends of the main section 211 of the rotor shaft 210 are rotatably connected to the stator housing 110 through the first bearing 400 and the second bearing 500, respectively. Thus, the first bearing 400 and the second bearing 500 form a stable support for both ends of the main section 211, so that the rotor shaft 210 is relatively fixed to the stator housing 110 in the radial direction, thereby avoiding the situation where the rotor shaft 210 is offset relative to the stator due to the force on the rotor shaft 210, and further avoiding the second detection member 320 fixed to the rotor shaft 210 from offsetting relative to the first detection member 310, so as to ensure the accuracy of position detection.

[0072] In addition, in order to limit the axial positions of the first bearing 400 and the second bearing 500, as shown in FIG. Figure 3 , Figure 4As shown, the rotor shaft 210 is further provided with a first locking member 610 and a second locking member 620. The first locking member 610 abuts against the inner ring of the first bearing 400 in the axial direction, and the second locking member 620 abuts against the inner ring of the second bearing 500 in the axial direction, and the first locking member 610 and the second locking member 620 are both axially located between the first bearing 400 and the second bearing 500. Thus, the first locking member 610 can prevent the first bearing 400 from approaching the second bearing 500 in the axial direction, and the second locking member 620 can prevent the second bearing 500 from approaching the first bearing 400 in the axial direction, so that the distance between the first bearing 400 and the second bearing 500 remains unchanged, ensuring the stability of the first bearing 400 and the second bearing 500 supporting the rotor shaft 210.

[0073] In a second aspect, an embodiment of the present application further provides an electric toothbrush comprising the motor described in any of the above embodiments.

[0074] The electric toothbrush provided in the embodiment of the present application, since it adopts the motor described in any of the above embodiments, can reduce the influence of the motor's magnetic field on the Hall element and improve the accuracy of rotor position detection, so that the brush head of the electric toothbrush can swing accurately and provide an efficient cleaning effect.

[0075] It should be noted that, in addition to the above-mentioned motor, the electric toothbrush also includes components such as a battery, a brush head, and a movement, wherein the battery is electrically connected to the motor to provide electrical energy to the motor; the brush head is connected to the rotor shaft 210 of the motor, and the motor is used to convert electrical energy into mechanical energy and drive the brush head to swing or rotate. The movement is provided with a circuit board 800, which is used to control the movement of the brush head and realize other additional functions of the electric toothbrush (such as speed regulation, timing, etc.).

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A motor for an electric toothbrush, characterized in that: include: The stator comprises a stator shell and a first electromagnetic induction member fixed in the stator shell; A rotor, comprising a rotor shaft and a second electromagnetic induction component, wherein the rotor shaft is rotatably connected to the stator shell, the rotor shaft comprises a main section and an extension section, the main section is located inside the stator shell, and the extension section extends outside the stator shell, the second electromagnetic induction component is arranged on the main section and has a gap with the inner wall of the end of the stator shell in the axial direction, the first electromagnetic induction component is one of a coil winding and a permanent magnet, and the second electromagnetic induction component is the other of the coil winding and the permanent magnet; A detection component is used to detect the rotation angle of the rotor. The detection component includes a first detection component and a second detection component. The first detection component is arranged outside the stator shell and is relatively fixed to the stator shell. The second detection component is arranged on the extended section of the rotor shaft and corresponds to the position of the first detection component.

2. The motor according to claim 1, characterized in that The first detection member is a magnetic sensor, and the second detection member is a magnetic member; or the first detection member is a magnetic member, and the second detection member is a magnetic sensor.

3. The motor according to claim 2, characterized in that The magnetic sensor is a Hall sensor.

4. The motor according to any one of claims 1 to 3, characterized in that: The motor further comprises a mounting seat, which is fixed to the extended section of the rotor shaft and is spaced apart from the stator shell in the axial direction. The second detection member is arranged on a side of the mounting seat away from the stator shell.

5. The motor according to claim 4, characterized in that The mounting seat is a magnetic isolation member.

6. The motor according to claim 4, characterized in that A protrusion is formed on a surface of the mounting seat facing away from the stator shell, and the protrusion is provided with a connecting through hole matched with the rotor shaft. The second detection member is sleeved outside the protrusion and abuts against a surface of the mounting seat facing away from the stator shell.

7. The motor according to claim 6, characterized in that A groove is formed on a surface of one side of the mounting seat away from the stator shell. The groove is arranged around the protruding portion, and the second detecting member is arranged in the groove.

8. The motor according to claim 4, characterized in that The stator shell has an end cover at one end along the axial direction, and a through hole is provided on the end cover. The extended section of the rotor shaft extends out of the stator shell through the through hole. A first gap is provided between the inner wall of the through hole and the outer wall of the rotor shaft, and the projection of the mounting seat on the end cover along the axial direction at least partially covers the first gap.

9. The motor according to claim 8, characterized in that The motor also includes a base and a circuit board arranged on the base. The base is a hard part, connected to one end of the stator shell close to the end cover, and the circuit board is spaced apart from the end of the extended section of the rotor shaft.

10. The motor according to claim 9, characterized in that The first detection member is a magnetic sensor, the second detection member is a magnetic member, and the magnetic sensor is arranged on a surface of the circuit board facing the magnetic member.

11. The motor according to claim 10, characterized in that The first detection component includes a plurality of magnetic sensors, and the plurality of magnetic sensors are uniformly arranged along the circumferential direction on the surface of the circuit board facing the magnetic component.

12. The motor according to claim 10, characterized in that The coil winding has an outlet terminal, the outlet terminal is connected with a lead wire, the lead wire is arranged through the edge of the circuit board, and the magnetic sensor is arranged close to the center of the circuit board.

13. The motor according to claim 11, characterized in that The circuit board includes a hard circuit board and a first flexible circuit board. The hard circuit board is arranged on the base. The magnetic sensor is arranged on the first flexible circuit board. The first flexible circuit board is electrically connected to the hard circuit board.

14. The motor according to claim 13, characterized in that The rigid circuit board includes a first surface and a second surface disposed opposite to each other, the first surface faces the rotor shaft, a portion of the first flexible circuit board is bonded and fixed to the first surface, and the magnetic sensor is disposed on the surface of the first flexible circuit board facing the rotor shaft.

15. The motor according to claim 14, characterized in that The circuit board also includes a second flexible circuit board, which is disposed on the second surface of the rigid circuit board and is electrically connected to the first flexible circuit board through a via hole penetrating the rigid circuit board.

16. The motor according to claim 13, characterized in that The surface of the rigid circuit board used for mounting the magnetic sensor is parallel to the surface of the mounting seat used for mounting the magnetic member.

17. The motor according to any one of claims 1 to 3, characterized in that: The motor further includes a first bearing and a second bearing, and both ends of the main body section are rotatably connected to the stator housing through the first bearing and the second bearing respectively.

18. The electric machine according to claim 17, characterized in that The rotor shaft is also provided with a first locking member and a second locking member, the first locking member is axially abutted against the inner ring of the first bearing, the second locking member is axially abutted against the inner ring of the second bearing, and the first locking member and the second locking member are located between the first bearing and the second bearing.

19. The motor according to any one of claims 1 to 3, characterized in that: The motor is a servo motor, which includes a control circuit, which is electrically connected to the detection component and to the rotor or the stator. The control circuit is at least configured to: control the rotor to oscillate back and forth around the rotor shaft with a reference position as the center in a preset manner, and control the rotor to rotate around the rotor shaft to switch the reference position in a preset manner.

20. An electric toothbrush, characterized in that: A motor comprising any one of claims 1 to 19.

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