Motor for electric toothbrush, and electric toothbrush

Abstract

The present application discloses a motor for an electric toothbrush, and an electric toothbrush. The motor comprises a stator, a rotor and a measurement assembly, wherein the stator comprises a stator housing and a first electromagnetic induction member fixed in the stator housing; the rotor comprises a rotor shaft and a second electromagnetic induction member; the rotor shaft comprises a body section and an extension section, the body section is located in the stator housing, the extension section extends out of the stator housing, and the second electromagnetic induction member is arranged on the body section; the measurement assembly comprises a first measurement member and a second measurement member; the first measurement member is arranged outside the stator housing and is fixed relative to the stator housing, and the second measurement member is arranged on the extension section of the rotor shaft and corresponds to the first measurement member in position.

Description

Motor for electric toothbrush and electric toothbrush 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] Compared with traditional manual toothbrushes, electric toothbrushes have obvious advantages in terms of function richness and user experience, such as better cleaning effect and more convenient use, and are therefore favored by more and more consumers.

[0003] The power component of an electric toothbrush is typically an electric motor, also known as a motor. A motor typically consists of a rotor and a stator. Electromagnetic induction between the rotor and the stator rotates the stator, thereby driving the brush head to rotate or vibrate. To detect the rotor's rotation angle, a detection element can be used. However, this element can be affected by the motor's magnetic field, resulting in inaccurate detection.

[0004] Summary of the Invention

[0005] The present application discloses a motor for an electric toothbrush and an electric toothbrush, which can reduce the influence of the motor's magnetic field on a detection component and improve detection accuracy.

[0006] In order to achieve the above objectives, the present application discloses, in a first aspect, a motor for an electric toothbrush, comprising:

[0007] The stator comprises a stator shell and a first electromagnetic induction member fixed in the stator shell;

[0008] a rotor comprising a rotor shaft and a second electromagnetic induction member, the rotor shaft being rotatably connected to the stator housing, the rotor shaft comprising a main section and an extension section, the main section being located within the stator housing, the extension section extending outside the stator housing, the second electromagnetic induction member being disposed within the main section and having a gap axially spaced from an inner wall of an end portion of the stator housing, the first electromagnetic induction member being one of a coil winding and a permanent magnet, and the second electromagnetic induction member being the other of the coil winding and the permanent magnet; and

[0009] A detection component is configured to detect the rotation angle of the rotor, and the detection component includes a first detection member and a second detection member. The first detection member is arranged outside the stator shell and is fixed relative to the stator shell. The second detection member is arranged on the protruding section of the rotor shaft and corresponds to the position of the first detection member.

[0010] As an optional implementation of the embodiment of the present application, 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] As an optional implementation of the embodiment of the present application, the magnetic sensor is a Hall sensor.

[0012] As an optional implementation of the embodiment of the present application, the motor also includes a mounting seat, which is fixed to the protruding section of the rotor shaft and is axially spaced apart from the stator case, and the second detection member is arranged on a side of the mounting seat away from the stator case.

[0013] As an optional implementation of the embodiment of the present application, the mounting base is a magnetic isolation member.

[0014] As an optional implementation of the embodiment of the present application, a protrusion is formed on the side 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. The second detection piece is sleeved on the outside of the protrusion and abuts against the side surface of the mounting seat facing away from the stator shell.

[0015] As an optional implementation of the embodiment of the present application, a groove is formed on a surface of the mounting seat facing away from the stator shell, the groove is arranged around the protrusion, and the second detection member is arranged in the groove.

[0016] As an optional implementation of the embodiment of the present application, the stator case has an end cover at one end along the axial direction, and a second through hole is provided on the end cover. The protruding section of the rotor shaft extends out of the stator case through the second through hole. There is a first gap between the inner wall of the second 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] As an optional implementation of the embodiment of the present application, the motor also includes a base and a circuit board arranged 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 protruding section of the rotor shaft.

[0018] As an optional implementation of the embodiment of the present application, the first detection member is a magnetic sensor, the second detection member is a magnetic member, and the magnetic sensor is arranged on the surface of the circuit board facing the magnetic member.

[0019] As an optional implementation of the embodiment of the present application, 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.

[0020] As an optional implementation of the embodiment of the present application, the coil winding has an outlet end, the outlet end is connected to a lead wire, the lead wire is arranged through the edge of the circuit board, and the magnetic sensor is arranged near the center of the circuit board.

[0021] As an optional implementation of the embodiment of the present application, 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] As an optional implementation of an embodiment of the present application, the rigid 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] As an optional implementation of the embodiment of the present application, the circuit board also includes a second flexible circuit board, which is arranged on the second surface of the rigid circuit board and is electrically connected to the first flexible circuit board through a via hole passing through the rigid circuit board.

[0024] As an optional implementation of the embodiment of the present application, the surface of the rigid circuit board configured to mount the magnetic sensor is parallel to the surface of the mounting base configured to mount the magnetic component.

[0025] As an optional implementation of the embodiment of the present application, 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] The second aspect of the present application discloses a motor for an electric toothbrush, comprising:

[0027] The stator comprises a stator shell and a first electromagnetic induction member fixed in the stator shell;

[0028] a rotor comprising a rotor shaft and a second electromagnetic induction member, wherein the rotor shaft is at least partially disposed within the stator housing, the second electromagnetic induction member is disposed on the rotor shaft, the first electromagnetic induction member is one of a coil winding and a permanent magnet, and the second electromagnetic induction member is the other of the coil winding and the permanent magnet;

[0029] a detection assembly configured to detect the rotation angle of the rotor, the detection assembly comprising a first detection member and a second detection member, the first detection member being fixed relative to the stator housing, the second detection member being fixed relative to the rotor shaft and corresponding in position to the first detection member;

[0030] a first bearing and a second bearing, disposed between the rotor shaft and the stator housing, the first bearing and the second bearing being configured to rotatably connect the rotor shaft to the stator housing, the first bearing and the second bearing being located on either side of the axial direction of the second electromagnetic induction element, respectively; and

[0031] A locking assembly abuts against the first bearing and / or the second bearing in the axial direction to lock the rotor shaft and the stator housing in the axial direction.

[0032] As an optional implementation of the embodiment of the present application, the locking assembly includes:

[0033] a first locking member, fixed to the rotor shaft and axially abutting against the inner ring of the first bearing;

[0034] The second locking member is fixed on the rotor shaft and is located on both sides of the first bearing in the axial direction with the first locking member. The second locking member is in axial contact with the inner ring of the first bearing.

[0035] As an optional implementation of the embodiment of the present application, the locking assembly further includes:

[0036] a first stop portion, fixed relative to the stator housing, the first stop portion abutting against an end surface of an outer ring of the first bearing away from the first locking member;

[0037] The second stop portion is fixed relative to the stator housing, and the second stop portion abuts against an end surface of the outer ring of the second bearing away from the second locking member.

[0038] As an optional implementation manner of the embodiment of the present application, a first bearing chamber is formed at the first end of the stator housing, the first bearing is disposed in the first bearing chamber, a first through-hole is formed in an end wall of the first bearing chamber, the first end of the rotor shaft passes through the first through-hole, and the aperture of the first through-hole is larger than the inner ring diameter of the first bearing and smaller than the outer ring diameter of the first bearing, so that the end wall of the first bearing chamber forms the first stop portion;

[0039] A second bearing chamber is formed at the second end of the stator housing, and the second bearing is arranged in the second bearing chamber. A second through hole is opened on the end wall of the second bearing chamber, and the second end of the rotor shaft passes through the second through hole. The aperture of the second through hole is larger than the inner ring diameter of the second bearing and smaller than the outer ring diameter of the second bearing, so that the end wall of the second bearing chamber forms the second stop portion.

[0040] As an optional implementation of the embodiment of the present application, the stator housing includes:

[0041] A main housing, wherein the main housing defines a mounting cavity having one closed end and the other open end, the closed end of the main housing protruding away from the mounting cavity to form a first protrusion, a first bearing chamber being formed within the first protrusion, and the first bearing chamber being configured to accommodate a first bearing;

[0042] An end cover is provided at the open end of the main shell, and the end cover protrudes in a direction away from the mounting cavity to form a second protrusion, a second bearing chamber is formed in the second protrusion, and the second bearing chamber is configured to be provided with a second bearing.

[0043] As an optional implementation of the embodiment of the present application, the outer ring of the first bearing is interference fit with the first bearing chamber, and the outer ring of the second bearing is interference fit with the second bearing chamber.

[0044] As an optional implementation of the embodiment of the present application, a wire hole is provided on the end cover, and the wire hole avoids the second protrusion.

[0045] As an optional implementation of the embodiment of the present application, the outer diameter of the second bearing is smaller than the outer diameter of the first bearing, and the outer diameter of the second protrusion is smaller than the outer diameter of the first protrusion.

[0046] As an optional implementation of the embodiment of the present application, a reinforcing plate is provided at the closed end of the main shell, and the reinforcing plate is sleeved on the first protrusion.

[0047] As an optional implementation of the embodiment of the present application, the reinforcing plate is provided with a connecting structure configured to connect to the movement of the electric toothbrush.

[0048] As an optional implementation of the embodiment of the present application, the rotor shaft includes a first section and a second section, the diameter of the first section is larger than the diameter of the second section, the first section is configured to connect to the brush head of the electric toothbrush, the second section is arranged in the stator housing, and a portion of the first section is located in the stator housing and connected to the first bearing.

[0049] As an optional implementation of the embodiment of the present application, the open end of the main shell is provided with a limiting step and a bending portion, the limiting step and the bending portion are arranged at intervals along the axial direction, the edge of the end cover is clamped between the limiting step and the bending portion, and the outer peripheral surface of the end cover is in contact with the inner wall surface of the main shell.

[0050] As an optional implementation of the embodiment of the present application, the motor further includes a base and a circuit board disposed on the base, and the base is connected to the open end of the main shell or the end cover.

[0051] As an optional implementation of the embodiment of the present application, the base is a hard part.

[0052] As an optional implementation of the embodiment of the present application, the surface roughness of the first locking member and the second locking member are both less than 12.5 μm to 50 μm.

[0053] As an optional implementation of the embodiment of the present application, 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.

[0054] As an optional implementation of the embodiment of the present application, the motor is a servo motor, and the servo motor includes a control circuit, which is electrically connected to the detection component and the control circuit is electrically connected to the rotor or the stator. The control circuit is at least configured to: control the rotor to swing 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 in a preset manner to switch the reference position.

[0055] A third aspect of the present application discloses an electric toothbrush, which comprises a motor as described in any one of the above items.

[0056] Compared with the prior art, this application has the following beneficial effects:

[0057] The motor for an electric toothbrush provided in an 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 inside 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. 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.

[0059] FIG1 is an exploded view of a motor provided in an embodiment of the present application;

[0060] FIG2 is a cross-sectional view of a motor provided in an embodiment of the present application;

[0061] FIG3 is an enlarged view of portion A of FIG2 ;

[0062] FIG4 is an enlarged view of portion B of FIG2 ;

[0063] FIG5 is a partial cross-sectional view of another cross-sectional surface of the motor provided in an embodiment of the present application;

[0064] FIG6 is an enlarged view of portion C of FIG5.

[0065] Description of main reference numerals

[0066] 100 - stator; 110 - stator housing; 111 - first electromagnetic induction element; 120 - main housing; 121 - first protrusion; 122 - first stopper; 1221 - first through hole; 123 - limiting step; 124 - bent portion; 125 - reinforcement plate; 130 - end cover; 131 - second protrusion; 132 - second stopper; 1321 - second through hole; 133 - wire hole;

[0067] 200 - rotor; 210 - rotor shaft; 210A - first section; 210B - second section; 211 - main section; 212 - extension section; 213 - first end; 214 - second end; 220 - second electromagnetic induction element;

[0068] 300 - detection assembly; 310 - first detection member; 320 - second detection member; 321 - mounting seat; 321A - raised portion; 321B - groove;

[0069] 400-first bearing;

[0070] 500-second bearing;

[0071] 610-first locking member; 620-second locking member;

[0072] 700-base;

[0073] 800-circuit board; 810-rigid circuit board; 820-first flexible circuit board;

[0074] 900-lead. DETAILED DESCRIPTION

[0075] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0076] In this application, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0077] Furthermore, the terms "first," "second," and the like are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0078] An electric toothbrush uses a motor that rapidly rotates or vibrates to generate high-frequency vibrations in the brush head. This high-frequency vibration breaks down toothpaste into fine foam, deeply cleaning between teeth. The trembling of the bristles also stimulates blood circulation in the mouth and massages the gums. Electric toothbrushes typically come in two types: rotary and vibrating. Rotary electric toothbrushes use a motor to drive the brush head, enhancing friction. Vibrating electric toothbrushes feature a high-frequency oscillation of the brush head, effectively cleaning even the most challenging areas of the mouth.

[0079] An electric toothbrush primarily consists of a battery, motor, brush head, and movement. The motor is the power component of the electric toothbrush. It provides power to the toothbrush, causing the brush head to rotate or vibrate. The principle of the motor is to convert electrical energy into mechanical energy through electromagnetic induction. In a vibrating electric toothbrush, a position detection element can be used to detect the rotor position information, allowing the control circuit to 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 located inside the stator housing and may be affected by the magnetic field within the motor, resulting in inaccurate detection.

[0080] In view of this, an embodiment of the present application provides 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.

[0081] The motor and the electric toothbrush for the electric toothbrush are described in detail below through specific embodiments:

[0082] In a first aspect, embodiments of the present application provide a motor for an electric toothbrush, as shown in Figures 1 to 3 . The motor includes a stator 100, a rotor 200, and a detection assembly 300. The stator 100 includes a stator housing 110 and a first electromagnetic induction member 111 fixed within 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. The rotor shaft 210 is rotatably connected to the stator housing 110, allowing the rotor shaft 210 to rotate relative to the stator housing 110. The detection assembly 300 can be used to detect the position or rotation angle of the rotor. The detection assembly 300 may include a first detection member 310 and a second detection member 320. The first detection member 310 is fixed relative to the stator housing 110, and the second detection member 320 is fixed relative to the rotor shaft 210.

[0083] It should be noted that the first electromagnetic induction element 111 can be either a coil winding or a permanent magnet, and the second electromagnetic induction element 220 can be either a coil winding or a permanent magnet. The specific configuration can vary depending on the type of motor. For example, in a brushed motor, since brushed motors use brushes and a commutator to alternately change the direction of the electromagnetic field, thereby rotating the motor rotor, the first electromagnetic induction element 111, fixed relative to the stator housing 110, can be a permanent magnet, while the second electromagnetic induction element 220, fixed relative to the rotor shaft 210, can be a coil winding. The brushes contact and conduct electricity with the coil winding, allowing current to enter the coil through the brushes, generating a magnetic field. This magnetic field interacts with the permanent magnets within the stator housing 110, thereby driving the rotor to rotate. For another example, in a brushless motor, brushless motors do not use brushes, but instead employ an electronic commutator to detect the position of the motor rotor and control the direction of current flow, thereby achieving rotor rotation. Therefore, in the brushless motor, the first electromagnetic induction element 111 fixed relative to the stator housing 110 can be a coil winding, while the second electromagnetic induction element 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, which interacts with the permanent magnet on the rotor, thereby driving the rotor to rotate.

[0084] To precisely control the rotation of the rotor, the motor can also be a servo motor. The main operating principle of a servo motor is to achieve efficient and stable brushing based on a precise control and feedback system. In addition to the aforementioned components, the servo motor also includes a control circuit, which is electrically connected to the detection assembly 300 and to the rotor 200 or stator 100. Its general operation process is as follows: When the user turns on the electric toothbrush, the control circuit sends a start signal to the servo motor and supplies power to the servo motor. Upon receiving the start signal, the servo motor begins operating, converting electrical energy into mechanical energy, thereby generating torque to drive the rotor 200 and the brush head. The detection assembly 300 provides real-time feedback on the position and / or speed of the rotor 200 and feeds 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 moves precisely according to preset parameters, thereby achieving the optimal cleaning effect.

[0085] In one possible implementation, the control circuit can control the rotor 200 to oscillate 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 oscillate back and forth with the reference position as the center when oscillating 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 while keeping the overall position of the electric toothbrush unchanged, the control circuit can also control the rotor 200 to rotate around the rotor shaft 210 and switch to different reference positions. This allows the brush head to oscillate back and forth with different reference positions as the center. For example, at a first moment, the rotor 200 is at a first reference position, and the control circuit can control the rotor 200 and the brush head to oscillate 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 oscillates 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 point, the control circuit controls the rotor 200 and the brush head to oscillate back and forth 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 operated 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. This reciprocating motion allows the brush head to vibrate at multiple reference positions, thereby expanding the cleaning range and improving the cleaning effect while maintaining the user's grip.

[0086] 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.

[0087] The detection assembly 300 can be implemented using 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 detecting the position or rotation angle of the rotor. Specifically, the magnetic sensor can be implemented using a Hall effect sensor.

[0088] To prevent the magnetic field inside the stator housing 110 from affecting the detection accuracy of the detection assembly 300, as shown in Figures 3 and 4, the rotor shaft 210 includes a main section 211 and an extension section 212. The main section 211 is located inside the stator housing 110, and the extension section 212 extends outside the stator housing 110. The second electromagnetic induction element 220 is disposed in the main section 211 and corresponds to the first electromagnetic induction element 111 inside the stator housing 110. The first detection element 310 is disposed outside the stator housing 110 and is fixed relative to the stator housing 110. The second detection element 320 is disposed in the extension section 212 of the rotor shaft 210 and corresponds to the first detection element 310. Such an arrangement enables the first detection component 310 and the second detection component 320 to be located outside the stator housing 110, thereby being isolated from the first electromagnetic induction component 111 and the second electromagnetic induction component 220 inside the stator housing 110, thereby preventing the magnetic field generated by the first electromagnetic induction component 111 and the second electromagnetic induction component 220 from affecting the detection component 300, thereby improving the detection accuracy.

[0089] As shown in FIG3 , to facilitate 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, with the second detection member 320 positioned on the side of the mounting seat 321 facing away from the stator housing 110. This ensures a stable installation of the second detection member 320 on the rotor shaft 210. Furthermore, the mounting seat 321 can be spaced apart from the stator housing 110 in the axial direction. This prevents the position of the rotor shaft 210 from changing due to friction between the mounting seat 321 and the stator housing 110, thereby preventing the detection accuracy from being affected.

[0090] Furthermore, the mounting base 321 can be configured as a magnetic isolation member, thereby isolating the magnetic field inside the motor and further preventing the magnetic field inside the motor from affecting the second detection member 320. Specifically, the mounting base 321 can be made of a material with high magnetic permeability, such as iron, nickel-iron alloy, or the like.

[0091] In addition, a raised portion 321A may be formed on the side of the mounting base 321 facing away from the stator housing 110. As shown in FIG3 , the raised portion 321A is provided with a connection hole that mates with the rotor shaft 210. In this case, the second detection member 320 may be configured as an annular structure and sleeved over the raised portion 321A. This allows radial positioning of the second detection member 320. Furthermore, the second detection member 320 may be brought into contact with the side of the mounting base 321 facing away from the stator housing 110, thereby axially positioning the second detection member 320 so that it is securely mounted on the rotor shaft 210.

[0092] Furthermore, to save space when installing the second detection member 320, as shown in FIG3 , a groove 321B can be formed on the side of the mounting base 321 facing away from the stator housing 110. The groove 321B is arranged around the protrusion 321A, and at least a portion of the second detection member 320 can be arranged in the groove 321B. This can save axial space occupied by the second detection member 320.

[0093] The structure of the stator case 110 can be implemented in various ways. For example, the stator case 110 can be configured as two detachably connected parts, which can be connected axially or radially. In one axially connected implementation, as shown in FIG3 , the stator case 110 includes a main housing 120 with one end open and an end cap 130 that seals the open end of the main housing 120. The end cap 130 is provided with a second through-hole 1321, through which the extension 212 of the rotor shaft 210 extends out of the stator case 110. A first gap is defined between the inner wall of the second through-hole 1321 and the outer wall of the rotor shaft 210. The axial projection of the mounting seat 321 on the end cap 130 at least partially covers the first gap. For example, in the embodiment shown in FIG3 , the outer diameter of the mounting seat 321 is larger than the inner diameter of the second through-hole 1321, so that the axial projection of the mounting seat 321 on the end cap 130 completely covers the first gap. Thus, the mounting base 321 can block the magnetic field at the first gap, thereby further improving the detection accuracy.

[0094] As shown in FIG3 , the motor further includes a base 700 and a circuit board 800 disposed on the base 700. The base 700 may be a hard component and connected to the end of the stator housing 110 near the end cap 130. The circuit board 800 may be spaced apart from the end of the extension 212 of the rotor shaft 210. The magnetic sensor may be disposed on the surface of the circuit board 800 facing the magnetic component. For example, the base 700 may be connected to the open end of the main housing 120 or the end cap 130 of the stator housing 110. Thus, the hard base 700 can provide sufficient support for the circuit board 800, connecting the base 700 and the stator housing 110 into a single unit. When the rotor shaft 210 is subjected to the force of brushing teeth and causes the electric toothbrush to deform, the entire electric toothbrush deforms synchronously, thereby preventing the relative positions of the first detection member 310 and the second detection member 320 from changing due to inconsistent deformation, thereby causing inaccurate detection.

[0095] It should be noted that the aforementioned magnetic sensor can be provided in one or more configurations. When there are multiple magnetic sensors, the multiple magnetic sensors are evenly arranged along the circumference 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.

[0096] As shown in Figure 3, the coil winding has an outlet terminal, to which a lead 900 is connected. Lead 900 can be used to provide current to the coil winding. Lead 900 can be arranged through the edge of circuit board 800, and the magnetic sensor can be arranged near the center of circuit board 800, so that lead 900 and the magnetic sensor are radially separated from each other. Because the flow of current through lead 900 also generates a certain magnetic field, separating lead 900 and the magnetic sensor can prevent the magnetic field generated by lead 900 from affecting the detection results of the magnetic sensor, further improving the accuracy of the detection.

[0097] There are various ways to implement the circuit board 800, including, for example, a rigid circuit board, a flexible circuit board, or a combination of both. In one embodiment of the combination, as shown in Figures 1 and 3 , the circuit board 800 includes a rigid circuit board 810 and a first flexible circuit board 820. The rigid circuit board 810 is disposed on the base 700, and the first flexible circuit board 820 is electrically connected to the rigid circuit board 810. The magnetic sensor can be disposed on either the first flexible circuit board 820 or the rigid circuit board 810.

[0098] Specifically, the rigid circuit board 810 includes a first surface and a second surface disposed opposite each other. The first surface faces the rotor shaft 210. As shown in Figure 3, a portion of the first flexible circuit board 820 is bonded 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. This provides a stable support for the magnetic sensor on the first flexible circuit board 820, preventing the position of the magnetic sensor from shifting, which could affect detection accuracy.

[0099] In another possible implementation of circuit board 800, circuit board 800 further includes a second flexible circuit board, which is disposed on the second surface of rigid circuit board 810 and electrically connected to first flexible circuit board 820 via second vias 1321 extending through rigid circuit board 810. This increases the effective area of ​​the flexible circuit board, allowing for the installation of more electrical components and chips, enabling the electric toothbrush to support multiple functions, such as timing, speed regulation, and connection to electronic devices. Furthermore, electrically connecting first flexible circuit board 820 and second flexible circuit board through metallized vias in rigid circuit board 810 reduces space occupied by wires and provides a more stable electrical connection.

[0100] Specifically, the surface of the rigid circuit board 810 used to mount the magnetic sensor can be arranged parallel to the surface of the mounting base 321 used to mount the magnetic component. This allows the magnetic sensor and the magnetic component to be arranged parallel to each other, maintaining a constant distance between them during rotor rotation, thereby achieving more accurate detection results.

[0101] To further stabilize the rotational connection between rotor shaft 210 and stator housing 110, as shown in Figures 1, 3, and 4, the motor further includes a first bearing 400 and a second bearing 500. The ends of the main body section 211 of rotor shaft 210 are rotationally connected to the stator housing 110 via the first bearing 400 and the second bearing 500, respectively. Thus, the first bearing 400 and the second bearing 500 provide stable support for both ends of the main body section 211, securing rotor shaft 210 radially relative to stator housing 110. This prevents displacement of rotor shaft 210 relative to the stator due to forces acting on rotor shaft 210, and further prevents displacement of the second detection member 320, which is fixed to rotor shaft 210, relative to the first detection member 310, thereby ensuring accurate position detection.

[0102] In a second aspect, embodiments of the present application further provide a motor for an electric toothbrush, comprising a stator 100, a rotor 200, and a detection assembly 300. The stator 100 comprises a stator housing 110 and a first electromagnetic induction member 111 fixed within the stator housing 110. The rotor 200 comprises a rotor shaft 210 and a second electromagnetic induction member 220 fixed to the rotor shaft 210. The rotor shaft 210 is rotatably connected to the stator housing 110, allowing the rotor shaft 210 to rotate relative to the stator housing 110. The detection assembly 300 can be used to detect the position or rotation angle of the rotor. The detection assembly 300 may comprise a first detection member 310 and a second detection member 320. The first detection member 310 is fixed relative to the stator housing 110, and the second detection member 320 is fixed relative to the rotor shaft 210.

[0103] When the brush head is subjected to force, in order to prevent the rotor shaft 210 from shifting or deforming, as shown in Figures 3 and 4, a first bearing 400 and a second bearing 500 can be set between the rotor shaft 210 and the stator housing 110. The first bearing 400 and the second bearing 500 are respectively located on both sides of the axial direction of the second electromagnetic induction member 220 to rotatably connect the rotor shaft 210 to the stator housing 110. In this way, the two bearings can fix the rotor shaft 210 in the radial direction, thereby preventing the rotor shaft 210 from being radially offset relative to the stator housing 110 due to force on the rotating shaft, thereby ensuring the accuracy of position detection. Among them, the inner ring of the first bearing 400 and the inner ring of the second bearing 500 are both fixed to the rotor shaft 210, and the outer ring of the first bearing 400 and the outer ring of the second bearing 500 are both fixed to the stator housing 110.

[0104] In addition, a locking assembly may be provided to axially abut against the first bearing 400 and / or the second bearing 500 to axially lock the rotor shaft 210 and the stator housing 110. This prevents axial movement of the bearings, ensures the stability of the support provided by the first bearing 400 and the second bearing 500 for the rotor shaft 210, and reduces the possibility of inaccurate detection by the detection assembly 300 due to deformation of the rotor shaft 210.

[0105] There are various implementations of the locking assembly. In one possible implementation, the locking assembly includes a first locking member and a second locking member. The first locking member is fixed to the rotor shaft 210 and axially abuts the inner ring of the first bearing 400. The second locking member is fixed to the rotor shaft 210 and located on either side of the first bearing 400, axially abutting the first locking member. The second locking member also axially abuts the inner ring of the first bearing 400. Thus, the first and second locking members can respectively axially limit the inner ring of the first bearing 400, thereby locking the inner ring of the first bearing 400 in its axial position. Similarly, locking members can also be provided on either side of the second bearing 500, abutting the inner ring of the second bearing 500 to lock the inner ring of the second bearing 500 in its axial position.

[0106] In another possible implementation of the locking assembly, as shown in Figures 1, 3, and 4, a first locking member 610 is fixed to the rotor shaft 210 and axially abuts the inner ring of the first bearing 400; a second locking member 620 is fixed to the rotor shaft 210 and axially abuts the inner ring of the second bearing 500; and both the first locking member 610 and the second locking member 620 are located between the first bearing 400 and the second bearing 500. Thus, the first locking member 610 prevents the inner ring of the first bearing 400 from axially moving toward the second bearing 500, and the second locking member 620 prevents the inner ring of the second bearing 500 from axially moving toward the first bearing 400. This maintains the distance between the first bearing 400 and the second bearing 500, ensuring the stability of the support provided by the first bearing 400 and the second bearing 500 for the rotor shaft 210.

[0107] Specifically, the first locking member 610 and the second locking member 620 may be sleeved on the rotor shaft 210 and interference fit with the rotor shaft 210. In addition, the first locking member 610 and the second locking member 620 may also be threadedly engaged with the rotor shaft 210, for example, using a lock nut.

[0108] To reduce friction between the first and second locking members 610, 620 and the bearing inner ring, the first and second locking members 610, 620 can be made of a material with a low surface roughness, such as copper, stainless steel, or other metal materials. Specifically, a material with a surface roughness of less than 12.5 μm to 50 μm can be selected. This reduces friction between the first and second locking members 610, 620 and the bearing inner ring, thereby reducing energy loss.

[0109] In addition to providing axial positioning for the bearing inner ring, the locking assembly also provides axial positioning for the bearing outer ring. As shown in Figures 3 and 4, the locking assembly also includes a first stopper 122 and a second stopper 132. The first stopper 122 is fixed relative to the stator housing 110 and abuts the end face of the outer ring of the first bearing 400, distal from the first locking member 610. The second stopper 132 is fixed relative to the stator housing 110 and abuts the end face of the outer ring of the second bearing 500, distal from the second locking member 620. Thus, the first stopper 122 cooperates with the first locking member 610 to lock the axial position of the first bearing 400, while the second stopper 132 cooperates with the second locking member 620 to lock the axial position of the second bearing 500. As a result, the axial positions of the first bearing 400 and the second bearing 500 are fixed, which can prevent the first bearing 400 and the second bearing 500 from moving in the axial direction, ensure the stability of the first bearing 400 and the second bearing 500 supporting the rotor shaft 210, and reduce the possibility of inaccurate detection by the detection assembly 300 due to deformation of the rotor shaft 210.

[0110] There are various ways to implement the first stop 122 and the second stop 132. For example, a stopper can be installed on the inner wall of the stator housing 110 to limit the outer ring of the bearing. Alternatively, a first bearing chamber can be formed at the first end 213 of the stator housing 110, with the first bearing 400 disposed within the first bearing chamber. As shown in FIG4 , a first through-hole 1221 is defined in the end wall of the first bearing chamber, through which the first end 213 of the rotor shaft 210 passes. The diameter of the first through-hole 1221 is larger than the inner ring diameter of the first bearing 400 and smaller than the outer ring diameter of the first bearing 400, thereby forming the first stop 122 on the end wall of the first bearing chamber. Correspondingly, a second bearing chamber is formed at the second end 214 of the stator housing 110, and the second bearing 500 is disposed within the second bearing chamber. As shown in FIG3 , a second through-hole 1321 is defined in the end wall of the second bearing chamber, through which the second end 214 of the rotor shaft 210 passes. The diameter of the second through-hole 1321 is larger than the inner diameter of the second bearing 500 and smaller than the outer diameter of the second bearing 500, thereby forming a second stop 132 on the end wall of the second bearing chamber. As a result, both the first stop 122 and the second stop 132 are integrally formed with the stator housing 110, providing a more stable structure and eliminating the need for separate stop components, thus reducing assembly difficulty.

[0111] Specifically, the structure of the stator housing 110 can be shown in Figures 2, 3, and 4. It includes a main housing 120 and an end cap 130. The main housing 120 defines a mounting cavity with one end closed and the other open. The closed end of the main housing 120 protrudes away from the mounting cavity to form a first protrusion 121. The first protrusion 121 defines a first bearing chamber for accommodating the first bearing 400. The end cap 130 is disposed at the open end of the main housing 120. The end cap 130 protrudes away from the mounting cavity to form a second protrusion 131. The second protrusion 131 defines a second bearing chamber for accommodating the second bearing 500. Because the second end 214 of the rotor shaft 210 is disposed through the end wall of the second bearing chamber and is intended for connection to a brush head, this structure allows the bearing in the second bearing chamber to be positioned as close to the brush head as possible. This reduces the cantilever of the rotor shaft 210 extending from the stator housing 110, resulting in minimal deformation when subjected to force, thereby minimizing interference with position detection.

[0112] When installing the first bearing 400 and the second bearing 500, the outer ring of the first bearing 400 can be interference-fitted with the inner wall of the first bearing chamber, and the outer ring of the second bearing 500 can be interference-fitted with the inner wall of the second bearing chamber. This further prevents axial movement of the first and second bearings 400 and 500, minimizing interference with position detection.

[0113] To supply power to the coil windings, the coil windings have an outlet terminal, to which a lead wire 900 is connected. Lead wire 900 can be connected to the power supply circuit. As shown in Figure 3, end cap 130 is provided with a wire hole 133 for passing lead wire 900. This hole 133 is positioned away from second protrusion 131 to avoid interfering with the assembly of the second bearing chamber and second bearing 500.

[0114] Furthermore, to provide sufficient space for the wire hole 133, the outer diameter of the second bearing 500 can be set smaller than the outer diameter of the first bearing 400, thereby making the outer diameter of the second protrusion 131 smaller than the outer diameter of the first protrusion 121. This reduces the radial dimension of the second protrusion 131, leaving sufficient space on the end cover 130 for the wire hole 133.

[0115] The connection structure between the main housing 120 and the end cap 130 can be implemented in a variety of ways. For example, the main housing 120 and the end cap 130 can be connected using fasteners such as screws and pins, or they can be connected using bonding. In one possible implementation, as shown in Figures 5 and 6, the open end of the main housing 120 is provided with a limiting step 123 and a bent portion 124. The limiting step 123 and the bent portion 124 are spaced apart in the axial direction. The edge of the end cap 130 is clamped between the limiting step 123 and the bent portion 124, and the outer circumferential surface of the end cap 130 is in contact with the inner wall surface of the main housing 120. Thus, the limiting step 123 and the bent portion 124 limit the axial freedom of the end cap 130, and the inner wall surface of the main housing 120 limits the radial freedom of the end cap 130, so that the end cap 130 can be firmly installed on the open end of the main housing 120 without the use of additional fasteners. The installation structure is simple and saves parts.

[0116] Specifically, in order to form the bent portion 124 , the side wall of the open end of the main shell 120 can be partially grooved and then bent toward the inner side of the main shell 120 , which has a simple manufacturing process.

[0117] As shown in FIG3 , the motor further includes a base 700 and a circuit board 800 disposed on the base 700. The base 700 may be a hard component and connected to the end of the stator housing 110 near the end cap 130. The circuit board 800 may be spaced apart from the end of the extended section of the rotor shaft 210. The magnetic sensor may be disposed on the surface of the circuit board 800 facing the magnetic component. For example, the base 700 may be connected to the open end of the main housing 120 or the end cap 130 of the stator housing 110. Thus, the hard base 700 can provide sufficient strength to support the circuit board 800, connecting the base 700 and the stator housing 110 into a whole. When the rotor shaft 210 is subjected to the force of brushing teeth and causes the electric toothbrush to deform, the entire electric toothbrush deforms synchronously, thereby preventing the relative positions of the first detection member 310 and the second detection member 320 from changing due to inconsistent deformation, thereby causing inaccurate detection.

[0118] As shown in Figure 4, the closed end of the main housing 120 is further provided with a reinforcing plate 125, which is sleeved around the outer periphery of the first raised portion 121. Because the first raised portion 121 is close to the brush head, it is subjected to stronger forces when the user brushes their teeth. Therefore, the reinforcing plate 125 structurally strengthens the closed end of the main housing 120, preventing the first bearing 400 from shifting due to deformation caused by the closed end of the main housing 120.

[0119] In order to facilitate the connection with the core of the electric toothbrush, a connecting structure for connecting the core is further provided on the reinforcing plate 125. Specifically, the connecting structure can be one or more of a threaded hole, a clamping protrusion or a clamping groove.

[0120] The structure of the rotor shaft 210 can be implemented in a variety of ways, for example, a shaft structure in which the diameters of all parts are equal can be adopted. In addition, the rotor shaft 210 can also adopt the structure shown in Figure 1, that is, the rotor shaft 210 includes a first section 210A and a second section 210B arranged in the axial direction, wherein the diameter of the first section 210A is larger than the diameter of the second section 210B, the first section 210A is used to connect to the brush head of the electric toothbrush, and the second section 210B is arranged in the stator housing 110. A portion of the first section 210A is located in the stator housing 110 and is connected to the first bearing 400. Since the first section 210A is used to connect to the brush head of the electric toothbrush, it is subjected to greater force. Therefore, setting the diameter of the first section 210A larger can make it more resistant to deformation, thereby effectively preventing the second detection member 320 from shifting and ensuring the accuracy of position detection.

[0121] In a third aspect, an embodiment of the present application further provides an electric toothbrush comprising the motor described in any of the above embodiments.

[0122] The electric toothbrush provided in the embodiment of the present application adopts the motor described in any of the above embodiments, and thus can reduce the influence of the motor's magnetic field on the Hall element, improve the accuracy of rotor position detection, and avoid the rotor shaft 210 from being offset axially or radially relative to the stator due to the force on the rotating shaft, causing relative displacement between the first detection member 310 and the second detection member 320, and thus leading to inaccurate detection, thereby allowing the brush head of the electric toothbrush to swing accurately and provide an efficient cleaning effect.

[0123] It should be noted that in addition to the aforementioned motor, the electric toothbrush also includes a battery, a brush head, and a movement. The battery is electrically connected to the motor to provide electrical energy to the motor; the brush head is connected to the motor's rotor shaft 210, which converts electrical energy into mechanical energy and drives the brush head to oscillate or rotate. The movement is equipped with a circuit board 800, which is used to control the movement of the brush head and implement other additional functions of the electric toothbrush (such as speed regulation and timing).

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A motor for an electric toothbrush, wherein: 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 member, the rotor shaft being rotatably connected to the stator housing, the rotor shaft comprising a main section and an extension section, the main section being located within the stator housing, the extension section extending outside the stator housing, the second electromagnetic induction member being disposed within the main section and having a gap axially spaced from an inner wall of an end portion of the stator housing, the first electromagnetic induction member being one of a coil winding and a permanent magnet, and the second electromagnetic induction member being the other of the coil winding and the permanent magnet; as well as, A detection component is configured to detect the rotation angle of the rotor, and the detection component includes a first detection member and a second detection member. The first detection member is arranged outside the stator shell and is fixed relative to the stator shell. The second detection member is arranged on the protruding section of the rotor shaft and corresponds to the position of the first detection member.

2. The motor according to claim 1, wherein The motor further includes a mounting seat, which is fixed to the extended section of the rotor shaft and spaced apart from the stator housing in the axial direction. The second detecting member is arranged on a side of the mounting seat away from the stator housing.

3. The motor according to claim 2, wherein 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. The second detection piece is sleeved outside the protrusion and abuts against a surface of the mounting seat facing away from the stator shell.

4. The motor according to claim 3, wherein 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 detecting member is arranged in the groove.

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

6. The motor according to claim 5, wherein The motor further 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. The circuit board is spaced apart from the end of the extended section of the rotor shaft.

7. The motor according to claim 6, wherein 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; And / or, 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.

8. The motor according to claim 7, wherein The coil winding has an outlet end, the outlet end is connected to a lead wire, the lead wire is arranged through the edge of the circuit board, and the magnetic sensor is arranged near the center of the circuit board.

9. The motor according to claim 7, wherein The circuit board includes a rigid circuit board and a first flexible circuit board. The rigid 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 rigid circuit board.

10. The motor according to claim 9, wherein The rigid circuit board includes a first surface and a second surface disposed opposite to each other, the first surface facing 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; and / or, The surface of the rigid circuit board on which the magnetic sensor is mounted is parallel to the surface of the mounting base on which the magnetic component is mounted.

11. The motor according to claim 1, wherein The motor is a servo motor, which 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. The control circuit is at least configured to: control the rotor to swing 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 in a preset manner to switch the reference position.

12. A motor for an electric toothbrush, wherein: 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 member, wherein the rotor shaft is at least partially disposed within the stator housing, the second electromagnetic induction member is disposed on the rotor shaft, the first electromagnetic induction member is one of a coil winding and a permanent magnet, and the second electromagnetic induction member is the other of the coil winding and the permanent magnet; a detection assembly configured to detect the rotation angle of the rotor, the detection assembly comprising a first detection member and a second detection member, the first detection member being fixed relative to the stator housing, the second detection member being fixed relative to the rotor shaft and corresponding in position to the first detection member; a first bearing and a second bearing, disposed between the rotor shaft and the stator housing, the first bearing and the second bearing being configured to rotatably connect the rotor shaft to the stator housing, the first bearing and the second bearing being respectively located on either side of the axial direction of the second electromagnetic induction element; as well as A locking assembly abuts against the first bearing and / or the second bearing in the axial direction to lock the rotor shaft and the stator housing in the axial direction.

13. The electric machine according to claim 12, wherein The locking assembly comprises: a first locking member, fixed to the rotor shaft and axially abutting against the inner ring of the first bearing; a second locking member, fixed on the rotor shaft and axially abutting against the inner ring of the second bearing; The first locking member and the second locking member are located between the first bearing and the second bearing.

14. The electric machine according to claim 13, wherein The locking assembly further comprises: A first stopper is fixed relative to the stator housing, the first stopper abutting against an end surface of an outer ring of the first bearing away from the first locking member; and The second stop portion is fixed relative to the stator housing, and the second stop portion abuts against an end surface of the outer ring of the second bearing away from the second locking member.

15. The electric machine according to claim 14, wherein A first bearing chamber is formed at the first end of the stator housing, the first bearing is disposed in the first bearing chamber, a first through-hole is formed in an end wall of the first bearing chamber, the first end of the rotor shaft passes through the first through-hole, and the diameter of the first through-hole is larger than the inner ring diameter of the first bearing and smaller than the outer ring diameter of the first bearing, so that the end wall of the first bearing chamber forms the first stopper; and A second bearing chamber is formed at the second end of the stator housing, and the second bearing is arranged in the second bearing chamber. A second through hole is opened on the end wall of the second bearing chamber, and the second end of the rotor shaft passes through the second through hole. The aperture of the second through hole is larger than the inner ring diameter of the second bearing and smaller than the outer ring diameter of the second bearing, so that the end wall of the second bearing chamber forms the second stop portion.

16. The electric machine according to claim 12, wherein The stator housing comprises: a main housing, wherein the main housing forms a mounting cavity having one closed end and the other open end, the closed end of the main housing protruding away from the mounting cavity to form a first protrusion, a first bearing chamber formed in the first protrusion, and the first bearing chamber is configured to accommodate a first bearing; and An end cover is provided at the open end of the main shell, and the end cover protrudes in a direction away from the mounting cavity to form a second protrusion, a second bearing chamber is formed in the second protrusion, and the second bearing chamber is configured to be provided with a second bearing.

17. The electric machine according to claim 16, wherein The end cover is provided with a wire hole, and the wire hole avoids the second protrusion; And / or, the outer diameter of the second bearing is smaller than the outer diameter of the first bearing, and the outer diameter of the second protrusion is smaller than the outer diameter of the first protrusion.

18. The electric machine according to claim 12, wherein The rotor shaft also includes a first section and a second section, the diameter of the first section is larger than the diameter of the second section, the first section is configured to connect to the brush head of the electric toothbrush, the second section is arranged in the stator housing, and a portion of the first section is located in the stator housing and connected to the first bearing.

19. The electric machine according to claim 16, wherein The open end of the main shell is provided with a limiting step and a bent portion, the limiting step and the bent portion are spaced apart in the axial direction, the edge of the end cover is clamped between the limiting step and the bent portion, and the outer peripheral surface of the end cover is in contact with the inner wall surface of the main shell; and / or, The motor further includes a base and a circuit board arranged on the base, and the base is connected to the open end of the main housing or the end cover.

20. An electric toothbrush, wherein: The invention comprises a motor, wherein the motor comprises: 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 member, the rotor shaft being rotatably connected to the stator housing, the rotor shaft comprising a main section and an extension section, the main section being located within the stator housing, the extension section extending outside the stator housing, the second electromagnetic induction member being disposed within the main section and having a gap axially spaced from an inner wall of an end portion of the stator housing, the first electromagnetic induction member being one of a coil winding and a permanent magnet, and the second electromagnetic induction member being the other of the coil winding and the permanent magnet; and A detection component is configured to detect the rotation angle of the rotor, and the detection component includes a first detection member and a second detection member. The first detection member is arranged outside the stator shell and is relatively fixed to the stator shell, and the second detection member is arranged on the protruding section of the rotor shaft and corresponds to the position of the first detection member.

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