Cleaning equipment and driving assembly

Abstract

The utility model relates to cleaning equipment and a driving assembly, the cleaning equipment comprises the driving assembly, a cleaning assembly and an energy supply assembly, and the driving assembly comprises a rotor assembly and a stator assembly; the rotor assembly comprises a first magnet and a second magnet, at least parts of the radial outer ends of the first magnet and the second magnet are bent bodies which are opposite in polarity and matched with the same stator core body, and each bent body is provided with a first arc pointing outwards; an X axis which is located in the symmetry plane and is perpendicular to the rotation axis is defined, the included angle between the center line of the first magnetizer and the X axis, the angle between the center line of the second magnetizer and the X axis are recorded as gamma, the central angle corresponding to the first arc is recorded as beta, and gamma and beta meet the following relation: gamma / beta is larger than or equal to 0.125 and smaller than or equal to 0.89. According to the cleaning equipment, by optimizing the matching angle of the magnetizer and the magnet, the effective action area of the magnetic field is increased, the magnetic leakage phenomenon is reduced, and therefore the energy utilization rate of the magnetic field is increased, and the output torque of the driving assembly is enhanced.

Description

Technical Field

[0001] This disclosure relates to the field of oral cleaning equipment technology, and more specifically, to a cleaning device and a drive component. Background Technology

[0002] In oral hygiene devices, the motor is the core component, playing a crucial role in driving the brush head's movement. Through precise motor control, the brush head can achieve specific modes of vibration or oscillation, effectively removing plaque and food debris from the tooth surface and providing a better cleaning effect than traditional manual toothbrushes.

[0003] In current technology, the coordination mechanism between the motor structure and brush head movement is a key factor affecting device performance. The motor's performance determines the vibration frequency and amplitude of the brush head, thus influencing the cleaning effect. Optimizing the motor structure can improve the user experience. Utility Model Content

[0004] In view of this, the present disclosure provides a cleaning device and a drive component to address the technical deficiencies existing in the prior art.

[0005] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0006] According to a first aspect of this disclosure, this disclosure provides a cleaning device, comprising:

[0007] A drive assembly includes a rotor assembly and a stator assembly. The stator assembly includes at least a pair of magnetizable stator cores uniformly distributed along a circumferential direction, and each stator core is provided with an excitation winding configured to generate an alternating magnetic field when energized. The rotor assembly includes a drive shaft and magnetic components fixed relative to the drive shaft and cooperating with the stator cores. The magnetic components include a first magnet and a second magnet arranged circumferentially around the drive shaft and cooperating with the same stator core. The first magnet and the second magnet have opposite polarities on the side facing the stator core, and at least a portion of the radially outer ends of the first magnet and the second magnet are curved bodies with opposite polarities and cooperating with the same stator core, the curved bodies having an outwardly pointing first arc shape. The stator assembly also includes magnetically conductive portions spaced apart from the stator cores in a circumferential direction. The magnetically conductive portions include a first magnetically conductive portion for cooperating with the first magnet and a second magnetically conductive portion for cooperating with the second magnet.

[0008] In a plane containing the rotation axis of the rotor assembly, at least one plane is a plane of symmetry; an X-axis is defined located in the plane of symmetry and perpendicular to the rotation axis, and at least one pair of the stator cores are configured to be symmetrically distributed with respect to the X-axis;

[0009] Wherein, the angle between the centerline of the first magnetic conductor and the X-axis, and the angle between the centerline of the second magnetic conductor and the X-axis are denoted as γ, and the central angle corresponding to the first arc is denoted as β. γ and β satisfy the following relationship: 0.125≤γ / β≤0.89;

[0010] A cleaning component coupled to the drive component;

[0011] A power supply component, configured to excite the excitation winding via an electrical signal.

[0012] In one embodiment of this disclosure, γ and β satisfy the following relationship: 0.22≤γ / β≤0.5.

[0013] In one embodiment of this disclosure, the value of γ ranges from 10° to 40°.

[0014] In one embodiment of this disclosure, the value of β ranges from 45° to 80°.

[0015] In one embodiment of this disclosure, the angle between the centerline of the first magnet and the X-axis is denoted as Ω, wherein the value of Ω ranges from 45° to 50°; the angle between the centerline of the second magnet and the X-axis is denoted as Ω, wherein the value of Ω ranges from 45° to 50°.

[0016] In one embodiment of this disclosure, the angle between the line segment from the outermost edge of the stator core to the center of the rotor assembly and the X-axis is denoted as φ, wherein the value of φ ranges from 40° to 55°.

[0017] In one embodiment of this disclosure, the curved body has an inwardly pointing third arc and two side edges that connect the corresponding ends of the first arc and the third arc; the central angles of the first arc and the third arc are the same.

[0018] In one embodiment of this disclosure, the air gap width between the first arc of the first magnet and the second magnet and the end of the stator core facing the magnetic component is denoted as d, wherein the value of d ranges from 0.15 mm to 0.5 mm.

[0019] In one embodiment of this disclosure, the end of the stator core near the first magnet and the second magnet is engaged with the curved body and has an outwardly pointing second arc; the central angle corresponding to the second arc is denoted as θ, wherein the value of θ ranges from 70° to 100°.

[0020] In one embodiment of this disclosure, the rotor assembly has a balanced position that engages with the stator core and an unbalanced position that deviates from the stator core; in a plane perpendicular to the axis of rotation, with the rotation center of the rotor assembly as the projection center, the magnetic element is configured to deflect by a predetermined angle and move such that its radial projection toward the projection center at least partially overlaps with the magnetically conductive portion.

[0021] In one embodiment of this disclosure, the cleaning device further includes a transmission assembly, one end of which is releasably connected to the cleaning assembly and the other end of which is connected to the drive shaft.

[0022] In one embodiment of this disclosure, the frequency range of the driving component in operation is 100 Hz to 180 Hz.

[0023] In one embodiment of this disclosure, the unidirectional rotation angle of the drive shaft relative to the stator core is 0° to 30°.

[0024] According to a second aspect of this disclosure, a cleaning device is provided, comprising:

[0025] A drive assembly includes a rotor assembly and a stator assembly. The stator assembly includes at least a pair of magnetizable stator cores uniformly distributed along a circumferential direction, and each stator core is provided with an excitation winding configured to generate an alternating magnetic field when energized. The rotor assembly includes a drive shaft with a fluid flow channel and magnetic components fixed relative to the drive shaft and cooperating with the stator cores. The magnetic components include a first magnet and a second magnet arranged circumferentially around the drive shaft and cooperating with the same stator core. The first magnet and the second magnet have opposite polarities on the side facing the stator core, and at least a portion of the radially outer ends of the first magnet and the second magnet are curved bodies with opposite polarities and cooperating with the same stator core, the curved bodies having an outwardly pointing first arc shape. The stator assembly also includes magnetically conductive portions spaced apart from the stator cores in a circumferential direction. The magnetically conductive portions include a first magnetically conductive portion for cooperating with the first magnet and a second magnetically conductive portion for cooperating with the second magnet.

[0026] In a plane containing the rotation axis of the rotor assembly, at least one plane is a plane of symmetry; an X-axis is defined located in the plane of symmetry and perpendicular to the rotation axis, and at least one pair of the stator cores are configured to be symmetrically distributed with respect to the X-axis;

[0027] Wherein, the angle between the centerline of the first magnetic conductor and the X-axis, and the angle between the centerline of the second magnetic conductor and the X-axis are denoted as γ, and the central angle corresponding to the first arc is denoted as β. γ and β satisfy the following relationship: 0.125≤γ / β≤0.89;

[0028] A cleaning component coupled to the drive component;

[0029] A power supply component, configured to excite the excitation winding via an electrical signal.

[0030] In one embodiment of this disclosure, the cleaning device further includes a drive pump connected to the liquid flow channel, the drive pump being configured to pump cleaning fluid into the cleaning assembly through the liquid flow channel.

[0031] According to a third aspect of this disclosure, a driving component is provided, the driving component comprising:

[0032] A stator assembly comprising at least one pair of magnetizable stator cores uniformly distributed along a circumferential direction, and each stator core being provided with an excitation winding configured to generate an alternating magnetic field when energized.

[0033] A rotor assembly includes a drive shaft and magnetic components fixed relative to the drive shaft and cooperating with the stator core. The magnetic components include a first magnet and a second magnet arranged circumferentially around the drive shaft and cooperating with the same stator core. The first magnet and the second magnet have opposite polarities on their sides facing the stator core. At least a portion of the radially outer ends of the first magnet and the second magnet are curved bodies with opposite polarities and cooperating with the same stator core, the curved bodies having an outwardly pointing first arc shape. The stator assembly also includes magnetically conductive portions spaced circumferentially from the stator core, each magnetically conductive portion including a first magnetically conductive portion for cooperating with the first magnet and a second magnetically conductive portion for cooperating with the second magnet.

[0034] In a plane containing the rotation axis of the rotor assembly, at least one plane is a plane of symmetry; an X-axis is defined located in the plane of symmetry and perpendicular to the rotation axis, and at least one pair of the stator cores are configured to be symmetrically distributed with respect to the X-axis;

[0035] The angle between the centerline of the first magnetic conductor and the X-axis, and the angle between the centerline of the second magnetic conductor and the X-axis are denoted as γ, and the central angle corresponding to the first arc is denoted as β. The following relationship is satisfied between γ and β: 0.125≤γ / β≤0.89.

[0036] The cleaning equipment disclosed herein optimizes the engagement angle between the magnetic conductor and the magnet, enabling the cogging torque to exhibit a smooth and linear change during motor shaft operation. This ensures the stability of the electromagnetic torque within the large-angle range of rotor movement, effectively expands the effective area of ​​the magnetic field, suppresses magnetic leakage, and significantly improves the magnetic field energy conversion efficiency. The combined effect of this wide-range constant electromagnetic torque and the smooth change in cogging torque not only allows for a larger reciprocating angle of the rotor assembly but also enhances the cleaning equipment's load-bearing capacity and control precision. Furthermore, the wide-range constant drive torque and improved magnetic field utilization create a synergistic effect, enhancing the cleaning equipment's environmental adaptability and cleaning efficiency.

[0037] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a cleaning device provided in an embodiment of this disclosure;

[0039] Figure 2 This is a cross-sectional view of a cleaning device provided in an embodiment of this disclosure;

[0040] Figure 3 This is a schematic diagram of the structure of a driving component provided in an embodiment of this disclosure;

[0041] Figure 4 This is a schematic diagram of the structure of a circular drive assembly provided in an embodiment of the present disclosure;

[0042] Figure 5 yes Figure 4 Cross-sectional view along the AA direction;

[0043] Figure 6 yes Figure 5 An enlarged diagram at circle M;

[0044] Figure 7 This is a schematic diagram of the structure of a rectangular driving component provided in an embodiment of this disclosure;

[0045] Figure 8 yes Figure 7 Cross-sectional view along the BB direction;

[0046] Figure 9 This is a schematic diagram of the structure of a circular drive assembly with a magnetically conductive part provided in an embodiment of the present disclosure;

[0047] Figure 10 yes Figure 9 Cross-sectional view along the CC direction;

[0048] Figure 11This is a schematic diagram of the structure of a rectangular drive assembly with a magnetically conductive portion provided in an embodiment of the present disclosure;

[0049] Figure 12 yes Figure 11 Cross-sectional view along the DD direction;

[0050] Figure 13 This is a frequency-current experimental data distribution diagram of a driving component provided in an embodiment of this disclosure;

[0051] Figure 14 This is an experimental data distribution diagram of the swing angle-frequency of a driving component provided in an embodiment of this disclosure;

[0052] Figure 15 This is an experimental data distribution diagram of the current-load of the drive component and the comparison motor provided in an embodiment of this disclosure;

[0053] Figure 16 This is an experimental data distribution diagram of the swing angle-load of the drive assembly and the comparison motor provided in an embodiment of this disclosure;

[0054] Figure 17 This is an experimental data distribution diagram of the torque of the drive component provided in one embodiment of this disclosure.

[0055] 1-Drive assembly; 111-Drive shaft; 112-Magnetic component; 1121-First magnet; 1122-Second magnet; 113-Rotor core; 121-Stator core; 122-Excitation winding; 1231-First magnetic conductor; 1232-Second magnetic conductor; 124-Annular base; 2-Cleaning assembly; 3-Power supply assembly; 4-Transmission assembly; 5-Outer shell; 6-Shell base; 7-Operation panel; 8-Button; 9-Liquid inlet assembly; 10-Power supply bracket; 11-Fastener; 12-Drive pump; 13-First seal; 14-Second seal; 15-Water tank; 16-End cap; 17-First bearing; 18-Drive housing; 19-Winding bracket; 20-Shaft sleeve; 21-Magnetic sensing ring; 22-Magnetic ring seat; 23-Spring; 24-Second bearing. Detailed Implementation

[0056] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0057] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0058] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0059] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0060] The specific embodiments of this disclosure are described below with reference to the accompanying drawings.

[0061] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0062] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0063] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0064] This disclosure provides a cleaning device, which can be a nursing device with functions such as vibration and oscillation, such as an electric toothbrush. The cleaning device includes a drive assembly, a cleaning assembly, and a power supply assembly. The drive assembly provides power to the entire cleaning device, and the cleaning assembly acts on the surface to be cleaned, performing cleaning actions under the drive of the drive assembly.

[0065] The drive assembly can be a motor, including a rotor assembly and a stator assembly. The stator assembly includes a magnetizable stator core, which can have one, two, or more pairs of cores, each with an excitation winding. When energized, the power supply assembly excites the excitation windings via an electrical signal, generating an alternating magnetic field to magnetize the stator core. The rotor assembly includes a drive shaft and magnetic components. The magnetic components are fixed relative to the drive shaft and cooperate with the stator core. The magnetic components can have one, two, or more pairs, and include a first magnet and a second magnet. The first and second magnets are arranged circumferentially around the drive shaft and cooperate with the same stator core. Driven by the alternating magnetic field, the magnetic components cause the rotor assembly to reciprocate angularly around its axis of rotation.

[0066] In addition, the stator assembly also includes a magnetically conductive portion, which is distributed circumferentially with the stator core and extends radially toward the magnetic element. The magnetically conductive portion includes a first magnetically conductive body for cooperating with a first magnet and a second magnetically conductive body for cooperating with a second magnet. The first and second magnetically conductive bodies are capable of receiving magnetic flux conducted by the stator core. At least a portion of the first and second magnets cooperate with the first and second magnetically conductive bodies to form magnetic flux. In the energized state, the first and second magnets cooperate with the stator core and the first and second magnetically conductive bodies to cause the rotor assembly to perform reciprocating angular displacement motion around its rotation axis.

[0067] In existing oral hygiene devices, the motor, as a core component, plays a crucial role in driving the brush head's movement. Through precise motor control, the brush head can achieve specific modes of vibration or oscillation, effectively removing plaque and food debris from the tooth surface and providing a better cleaning effect than traditional manual toothbrushes. However, the motor structure in existing technology suffers from unstable output torque, which directly affects the overall stability of the cleaning device and the user experience.

[0068] The cleaning equipment disclosed herein optimizes the engagement angle between the magnetic conductor and the magnet, enabling the cogging torque to exhibit a smooth and linear change during motor shaft operation. This ensures the stability of the electromagnetic torque within the large-angle range of rotor movement, effectively expands the effective area of ​​the magnetic field, suppresses magnetic leakage, and significantly improves the magnetic field energy conversion efficiency. The combined effect of this wide-range constant electromagnetic torque and the smooth change in cogging torque not only allows for a larger reciprocating angle of the rotor assembly but also enhances the cleaning equipment's load-bearing capacity and control precision. Furthermore, the wide-range constant drive torque and improved magnetic field utilization create a synergistic effect, enhancing the cleaning equipment's environmental adaptability and cleaning efficiency.

[0069] For ease of understanding, please refer to the following: Figures 1 to 17 The specific structure and working principle of the cleaning equipment and drive components disclosed herein will be described in detail with reference to the embodiments.

[0070] In one embodiment of this disclosure, a cleaning device is provided, which may be an oral cleaning device such as an electric toothbrush or other care device. Figure 1 This is a schematic diagram of the structure of a cleaning device provided in an embodiment of this disclosure. Figures 1 to 3As shown, the cleaning device disclosed herein includes a drive assembly 1, a cleaning assembly 2 coupled to the drive assembly 1, and a power supply assembly 3. The drive assembly 1 provides power to the entire cleaning device, and the cleaning assembly 2 performs cleaning actions under the drive of the drive assembly 1. The power supply assembly 3 is configured to excite the excitation winding 122 via an electrical signal. The power supply assembly 3 can adopt a sealed rechargeable lithium battery module, supporting wireless charging or magnetic contact charging, and outputs DC power to the drive circuit. The drive assembly 1 has a built-in inverter module that converts DC power into alternating current. In addition, it can also integrate an electronic commutation system (including a Hall sensor and a drive chip) to dynamically switch the current direction of the excitation winding 122 by real-time detection of the rotor position, driving the rotor assembly to reciprocate.

[0071] refer to Figures 1 to 3 In this embodiment, the cleaning device further includes a housing 5 and a housing base 6. The housing 5 has a cavity inside, which accommodates the drive assembly 1 and the power supply assembly 3. An operation panel 7 is provided on the outside of the housing 5, and the operation panel 7 has a groove in which a button 8 is embedded. During actual operation, the user can set the cleaning intensity and frequency using the button 8. The housing base 6 is located at the bottom of the housing 5, and the shape of the housing base 6 is adapted to the shape of the bottom of the housing 5. The two are joined together to form a closed cavity.

[0072] refer to Figure 3 The drive assembly 1 may include a rotor assembly, a stator assembly, and a drive housing 18, wherein the drive housing 18 is used to house the rotor assembly and the stator assembly, and the stator assembly is coaxially fitted with the rotor assembly. The rotor assembly is used to convert electromagnetic energy into mechanical kinetic energy, and the stator assembly is used to establish a controllable electromagnetic field system.

[0073] The stator assembly includes at least one pair of magnetizable stator cores 121 evenly distributed along the circumferential direction, and each stator core 121 is provided with an excitation winding 122, which is configured to generate an alternating magnetic field when energized. When there are two or more stator cores 121, the stator cores 121 are usually evenly arranged in the circumferential direction of the rotor assembly to facilitate the cyclic rotation or reciprocating oscillation of the rotor assembly. The rotor assembly includes a drive shaft 111 and at least one pair of magnetic elements 112 fixed relative to the drive shaft 111 and cooperating with the stator cores 121. The magnetic elements 112 are configured to cause the rotor assembly to reciprocate angular displacement motion about its rotation axis under the drive of the alternating magnetic field. In this embodiment, the drive shaft 111 can be rotatably connected to the drive assembly 1 through a structure such as a bearing, so that the drive shaft 111 can rotate relative to the drive assembly 1.

[0074] Furthermore, in the existing structure, the swing angle of the rotor assembly is limited by the inherent pole width of the stator assembly. When the magnet swings to the edge, the alignment angle between the magnet and the stator core 121 is insufficient, resulting in a decrease in magnetic flux and unstable output torque. Based on this, reference... Figures 9 to 12 In this embodiment, the stator assembly further includes magnetically conductive portions spaced circumferentially from the stator core 121. These magnetically conductive portions extend radially toward the magnetic element 112 from the stator core 121. The magnetically conductive portions receive magnetic flux conducted by the stator core 121. When at least a portion of the magnetic element 112 engages with the magnetically conductive portions, magnetic flux is formed between the magnetic element 112 and the magnetically conductive portions. In this embodiment, the magnetically conductive portions can be made of a high-conductivity material and extend radially toward the magnetic element 112 from the stator core, forming a magnetic pole region directly aligned with the magnetic element 112, thus expanding the effective coupling area between the magnetic element 112 and the stator core 121.

[0075] When the magnetic component 112 swings, the magnetic guide can extend the magnetic flux path from the main body area of ​​the stator core 121 to a larger range, thereby maintaining the continuity of magnetic flux within a larger angle range, improving the stability of the output torque of the drive assembly 1, and increasing the swing angle of the magnetic component 112, thereby increasing the swing angle of the cleaning assembly 2, thus enhancing the overall stability and flexibility of the cleaning equipment.

[0076] like Figure 3 As shown, in the drive assembly 1, the end of the drive housing 18 is closed by the end cap 16, and the drive shaft 111 runs through both ends of the housing. The two ends are supported by a first bearing 17 and a second bearing 24, respectively. The transmission assembly 4 is connected to the drive shaft 111 via the first bearing 17, and a spring 23 is placed between them to provide preload or buffer vibration. The excitation winding 122 surrounds the drive shaft 111 and is fixed by a winding bracket 19 for support and heat dissipation. At the other end of the drive shaft 111, as one embodiment, a sensing ring 21 fixed to the magnetic ring seat 22 can be provided, which cooperates with the second bearing 24 via a bushing 20 to achieve position or speed signal detection and precise alignment. All components are precisely connected to form a stable structure, ensuring that the drive assembly 1 has high rotational accuracy, low vibration, and reliable electrical performance.

[0077] Further, refer to Figures 4 to 12The magnetic component 112 includes at least a first magnet 1121 and a second magnet 1122 arranged circumferentially around the drive shaft 111 and cooperating with the same stator core. The polarities of the first magnet 1121 and the second magnet 1122 facing the stator core 121 are opposite. Specifically, the drive shaft 111 passes through the rotor core 113. The outer side of the rotor core 113 is provided with a groove, the shape of which matches the first magnet 1121 and the second magnet 1122. The first magnet 1121 and the second magnet 1122 are at least partially disposed in the corresponding groove. At least a portion of the radially outer ends of the first magnet 1121 and the second magnet 1122 are curved bodies with opposite polarities that cooperate with the same stator core 121. Specifically, when the end of the first magnet 1121 facing the stator core 121 is the S pole, the end of the second magnet 1122 facing the stator core 121 is the N pole; or, when the end of the first magnet 1121 facing the stator core 121 is the N pole, the end of the second magnet 1122 facing the stator core 121 is the S pole. In this way, after the excitation winding 122 is energized and generates a magnetic field, the first magnet 1121 and the second magnet 1122 can reciprocate and rotate by a predetermined angle under the action of the magnetic field, thereby realizing the reciprocating oscillation of the drive component 1.

[0078] The magnetic conductive part includes a first magnetic conductive body 1231 for cooperating with the first magnet 1121, and a second magnetic conductive body 1232 for cooperating with the second magnet 1122.

[0079] In actual operation, when the excitation winding 122 is energized and generates a magnetic field, the magnetic field drives the first magnet 1121 and the second magnet 1122 to oscillate. During this process, when the first magnet 1121 moves closer to the first magnetic conductor 1231, the second magnet 1122 moves away from the second magnetic conductor 1232 until it reaches another equilibrium position. For example, driven by the magnetic field generated by the energized excitation winding 122, the first magnet 1121 (with the outer N pole) moves closer to the first magnetic conductor 1231 (with the S pole) due to the attractive force, while the second magnet 1122 (with the outer S pole) moves away from the second magnetic conductor 1232 (with the N pole) due to the repulsive force, forming a directional oscillation of the rotor assembly. When the direction of the magnetic field changes periodically (e.g., the current reverses), the polarity of the magnetic conductors reverses, driving the magnets to move in the opposite direction, thereby achieving reciprocating oscillation. By continuously overlapping the magnetic component 112 and the magnetic conductive part on the radial projection of the stator core 121, the magnetic flux path remains continuous, reducing magnetic resistance and leakage magnetic field, ensuring stable electromagnetic torque output, supporting large-angle oscillation and improving energy efficiency, and is suitable for scenarios such as electric toothbrushes that require efficient and stable vibration.

[0080] The specific work process is as follows:

[0081] When the drive assembly 1 is energized, the power supply assembly 3 excites the excitation winding 122 via an electrical signal, forming a closed magnetic circuit inside the stator core 121. The alternating magnetic field generated by the excitation winding 122 has a periodically changing magnetic pole direction. Specifically, when a positive current is applied to the excitation winding 122, the end of the stator core 121 exhibits N-pole magnetism; when the current direction is reversed, the magnetic pole synchronously switches to S-pole. The first magnet 1121 and the second magnet 1122, which cooperate with it, are respectively fixedly provided with opposite permanent magnet polarities, wherein the outer end of the first magnet 1121 is an N-pole permanent magnet, and the outer end of the second magnet 1122 is an S-pole permanent magnet (or vice versa).

[0082] During the electromagnetic drive phase, when the excitation winding 122 of the stator core 121 is excited to the N pole, the magnetic field it generates repulsively interacts with the N pole of the first magnet 1121 and attracts the S pole of the second magnet 1122, forming a combined torque that causes the rotor to rotate clockwise. When the rotor rotates to a certain angle, the repulsive force between the first magnet 1121 and the stator core 121 weakens, and the first magnet 1121 attracts the first magnetic conductor 1231, driving the first magnet 1121 to continue deflecting. When the current direction is reversed, causing the stator core 121 to become the S pole, the magnetic field attracts the N pole of the first magnet 1121 and repulses the S pole of the second magnet 1122, forming a counterclockwise rotational torque. When the rotor rotates to a certain angle, the repulsive force between the second magnet 1122 and the stator core 121 weakens, and the second magnet 1122 attracts the second magnetic conductor 1232, continuing to deflect. By continuously switching the direction of the excitation current, the drive shaft 111 performs stable reciprocating motion within the set swing angle range.

[0083] refer to Figure 10 , Figure 12 In the plane containing the rotation axis of the rotor assembly, at least one plane is a plane of symmetry, defining an X-axis located in the plane of symmetry and perpendicular to the rotation axis; at least one pair of stator cores 121 are constructed to be symmetrically distributed with respect to the X-axis. The symmetrical arrangement of the stator cores 121 ensures symmetrical distribution of magnetic poles, so that the first magnet 1121 and the second magnet 1122 are subjected to symmetrical magnetic forces during oscillation in both directions, avoiding torque fluctuations caused by uneven magnetic resistance.

[0084] In a plane perpendicular to the rotation axis of the rotor assembly, a Y-axis is defined that is perpendicular to the X-axis and lies in the same plane. The first magnetic conductor 1231 and the second magnetic conductor 1232 are constructed to be symmetrically distributed with respect to the Y-axis. The symmetrical arrangement of the magnetic conductors along the Y-axis balances the magnetic flux conduction path in the direction perpendicular to the X-axis, preventing the magnetic field from generating asymmetrical components in the radial plane of the rotor and avoiding lateral torque caused by magnetic flux skew. The symmetrical magnetic conductors synchronously adjust the direction of magnetic flux conduction when the magnetic field switches (e.g., when the excitation current reverses, the polarity of the magnetic poles on both sides of the Y-axis reverses simultaneously), ensuring that the magnetic field energy is uniformly released in the spatial dimension and eliminating driving force pulsations caused by timing differences. In addition, the magnetic conductors form a uniform magnetic pole spacing in the circumferential direction, optimizing the magnetic field distribution gradient, avoiding local magnetic saturation or leakage magnetic concentration, and improving the overall magnetic field utilization rate.

[0085] refer to Figure 10 , Figure 12 The angle between the centerline of the first magnetic conductor 1231 and the X-axis, and the angle between the centerline of the second magnetic conductor 1232 and the X-axis are denoted as γ. The central angle corresponding to the first arc is denoted as β. γ and β satisfy the following relationship: 0.125≤γ / β≤0.89.

[0086] By limiting the ratio of γ to β, the magnetic flux distribution density in the magnetic conductor can be balanced, local magnetic saturation can be avoided, the continuity and closure of the magnetic field path can be ensured, magnetic leakage can be reduced, and energy transfer efficiency can be improved. Furthermore, the constraint relationship between γ and β makes the coupling between the magnetic conductor and the magnet smoother during rotation, reduces torque fluctuations caused by sudden changes in magnetic reluctance, lowers vibration and noise caused by magnetic field asymmetry, and improves the operational stability of the cleaning equipment.

[0087] Furthermore, in one embodiment of this disclosure, γ and β satisfy the following relationship: 0.22 ≤ γ / β ≤ 0.5. Further limiting the ratio of γ to β strengthens the closure of the magnetic field path, effectively reducing ineffective leakage flux and improving energy conversion efficiency. The narrowed range of γ / β makes the coupling transition between the magnetic conductor and the magnet smoother during rotation, reducing the periodic fluctuations of the reluctance torque, thereby reducing mechanical vibration and noise.

[0088] refer to Figure 10 , Figure 12 In one embodiment of this disclosure, the value of γ ranges from 10° to 40°.

[0089] If γ < 10°, the magnetic flux path coverage is insufficient, the electromagnetic torque range is reduced, and large-angle oscillation cannot be supported. If γ > 40°, the winding space of the stator core 121 will be limited, making the manufacturing process difficult. In addition, the cogging torque will increase significantly, leading to aggravated torque fluctuations at low-frequency output, causing abnormal vibration or noise. Based on this, the value of γ is in the range of 10° to 40°. The tilt angles of the first magnetic conductor 1231 and the second magnetic conductor 1232 are moderate, which can leave sufficient winding space, avoid insufficient winding spacing or difficulties in coil arrangement, and ensure the process stability of mass production. It can also reduce the interference of cogging torque on low-frequency operation, reduce torque fluctuations caused by sudden changes in magnetic reluctance, and improve the stability of low-frequency output.

[0090] In one embodiment of this disclosure, the value of β ranges from 45° to 80°. If β < 45°, the effective pole area of ​​the first magnet 1121 and the second magnet 1122 will be insufficient, resulting in a significant reduction in magnetic flux and a decrease in electromagnetic torque. Furthermore, the coupling area between the first magnet 1121 and the second magnet 1122 and the stator will be too narrow, making it impossible to maintain a large swing angle drive and reducing the output torque range. If β > 80°, the tip region of the first magnet 1121 and the second magnet 1122 will suffer from severe magnetic leakage, causing a large amount of magnetic flux leakage and a reduction in effective torque. Additionally, uneven magnetic field distribution will lead to extra losses, significantly reducing motor efficiency. Therefore, under the premise of satisfying and meeting the θ / β ratio, the value of β is controlled to be between 45° and 80° to ensure a continuous magnetic flux path and minimize magnetic leakage, thereby achieving efficient and stable large swing angle output performance of the drive component 1.

[0091] refer to Figure 10 , Figure 12 The angle between the center line of the first magnet 1121 and the X-axis is denoted as Ω, where the value of Ω ranges from 45° to 50°; the angle between the center line of the second magnet 1122 and the X-axis is denoted as Ω, where the value of Ω ranges from 45° to 50°.

[0092] In this embodiment, the centerlines of the first magnet 1121 and the second magnet 1122 can be symmetrically distributed on both sides of the X-axis at the same angle to form a mirror-symmetric magnetic field. This symmetrical angle reduces the risk of eccentric vibration in the rotor assembly and improves the stability of the drive assembly 1. Setting the value of Ω to a range of 45° to 50° allows the magnetic attraction between the first magnet 1121, the second magnet 1122, and the stator core 121 to effectively drive the reciprocating motion, while avoiding mechanical jamming or frictional losses caused by excessive magnetic attraction. Furthermore, it ensures that the magnetic field switching is perfectly matched to the phase of the mechanical reciprocating motion, improving energy utilization.

[0093] Similarly, refer to Figure 10 , Figure 12To further optimize the synergistic effect between the magnetic field and the drive assembly 1, in one embodiment of this disclosure, the angle between the line segment from the outermost edge of the stator core 121 to the center of the rotor assembly and the X-axis is denoted as φ, where the value of φ ranges from 40° to 55°. This ensures that the outermost edge of the stator core 121 covers the maximum effective operating range required by the rotor assembly, guaranteeing that the magnetic field remains closed through the stator core 121 during pole switching, reducing edge leakage magnetic field, and improving electromagnetic efficiency.

[0094] In one embodiment of this disclosure, in the same magnetic element 112, the angle between the center line of the first magnet 1121 and the center line of the second magnet 1122 is denoted as α. Specifically, the center line of the first magnet 1121 can be a line pointing from the center of the first magnet 1121 to the axis of rotation, and the center line of the second magnet 1122 can be a line pointing from the center of the second magnet 1122 to the axis of rotation. The value of α ranges from 80° to 100°.

[0095] If α is too small (<80°), the distance between the first magnet 1121 and the second magnet 1122 will be too close, leading to polarity conflict, broken magnetic flux paths, increased magnetic reluctance, and decreased output torque. Uneven magnetic field distribution will also cause unstable oscillation of the drive assembly 1. If α is too large (>100°), physical interference will occur at the edges of adjacent magnets during rotation, resulting in mechanical damage or friction noise. Asymmetrical magnetic field distribution will exacerbate torque output fluctuations and disrupt vibration stability. Therefore, the value of α is limited to 80° to 100° to ensure the symmetry of the magnet arrangement, the uniformity of the magnetic field distribution, the reliability of the mechanical structure, and ultimately achieve efficient and stable large-angle drive performance.

[0096] refer to Figure 6 In this embodiment, the air gap width between the first arc of the first magnet 1121 and the second magnet 1122 and the end of the stator core 121 facing the magnetic component 112 is denoted as d. The value of d ranges from 0.15 mm to 0.5 mm. This can avoid problems such as frictional wear or jamming and reduced magnetic flux efficiency due to magnetic saturation caused by an excessively small air gap width. It can also avoid problems such as excessive magnetic resistance, significant decrease in magnetic flux and insufficient output torque caused by an excessively large air gap width.

[0097] In one embodiment of this disclosure, the end of the stator core 121 closest to the first magnet 1121 and the second magnet 1122 is fitted with a curved body and has an outwardly pointing second arc shape. The central angle corresponding to the second arc shape is denoted as θ, and the central angle corresponding to the first arc shape is denoted as β. θ and β satisfy the following relationship: 0.875≤θ / β≤2.22. Limiting the relationship between θ and β to 0.875≤θ / β≤2.22 can optimize the magnetic pole coverage angle, effectively enhance the magnetic field coupling efficiency, and reduce edge magnetic flux leakage.

[0098] To further improve the efficiency of the drive component 1, the swing amplitude of the cleaning component 2 is controlled such that θ and β satisfy the following relationship: 1.25 ≤ θ / β ≤ 1.55. In this embodiment, the arc-shaped fit ratio of the first magnet 1121, the second magnet 1122, and the stator core 121 is further optimized, which can reduce magnetic flux leakage, improve magnetic field utilization, and reduce energy consumption to extend the power supply component's operating range. Furthermore, by adjusting the θ / β ratio to control the swing amplitude of the cleaning component, a better balance between cleaning force and comfort can be achieved, resulting in a highly efficient, stable, and low-energy-consumption drive effect for the cleaning equipment.

[0099] In this embodiment, θ ranges from 70° to 100°. θ is the central angle of the second arc of the stator core 121, which determines the coverage angle of the magnetic field coupling region between the stator core 121 and the magnet. If θ < 70°, the second arc of the stator core 121 is too narrow, causing the magnetic flux path of the first magnet 1121 and the second magnet 1122 to suddenly interrupt when they rotate to the edge position. At this time, the alignment angle between the first magnet 1121, the second magnet 1122 and the stator core 121 is insufficient, the magnetic resistance increases sharply, the magnetic flux drops sharply, resulting in a sharp decrease in torque output. The first magnet 1121 and the second magnet 1122 cannot maintain a stable magnetic force within a large angle range, the torque fluctuation intensifies, the electromagnetic torque range narrows, and it is difficult to achieve large swing angle drive.

[0100] If θ > 100°, the stator arc is too wide, resulting in an excessively long alignment angle between the magnet and the stator during rotation. However, the coverage angle of the first arc of the first magnet 1121 and the second magnet 1122 is insufficient. At this point, although the magnetic flux is high when the first magnet 1121 and the second magnet 1122 rotate to the middle position, near the edge of θ, the first arc of the first magnet 1121 and the second magnet 1122 cannot cover the second arc of the stator core, leading to uneven magnetic flux distribution. This results in a non-uniform magnetic field distribution with a "strong center and weak edge," causing torque output to fluctuate between peak and valley values ​​during rotation, making it impossible to maintain a stable large swing angle output. Therefore, controlling the value of θ to be between 70° and 100° can ensure the stability of the electromagnetic torque and improve the large swing angle output capability of the drive assembly 1.

[0101] refer to Figures 5 to 12 In one embodiment of this disclosure, the drive assembly 1 can be circular or rectangular. The curved body has an inwardly pointing third arc and two side edges connecting the corresponding ends of the first and third arcs. The central angles of the first and third arcs are the same. Specifically, the central angle of the first arc can be the angle formed between two first connecting line segments after connecting the two endpoints of the first arc to the center of the drive shaft 111. The central angle of the third arc can be the angle formed between two second connecting line segments after connecting the two endpoints of the third arc to the center of the drive shaft 111. The central angle of the third arc can be the angle formed between two second connecting line segments after connecting the two endpoints of the third arc to the center of the drive shaft 111. The central angle of the third arc can be the second central angle. The first and second central angles are the same and coincident. Setting the shapes of the first magnet 1121 and the second magnet 1122 to be arc-shaped can better match the rotor assembly and the stator assembly, help generate a more uniform magnetic field distribution, and thus reduce vibration and noise caused by non-uniform magnetic fields.

[0102] In one embodiment of this disclosure, the rotor assembly has a balanced position that engages with the stator core 121 and an unbalanced position that deviates from the stator core 121; in a plane perpendicular to the axis of rotation, with the rotation center of the rotor assembly as the projection center, the magnetic element 112 is configured to deflect by a predetermined angle and move so that its central projection in its radial direction toward the projection center at least partially overlaps with the magnetic conductive portion.

[0103] In the equilibrium position, the rotor assembly is aligned with the stator core 121, the magnetic flux path is optimized, and the electromagnetic torque reaches its maximum value. At this time, the pole faces (such as the S or N poles) of the magnetic element 112 are completely aligned with the magnetic conductive part of the stator core 121, ensuring maximum transmission of magnetic flux. When the rotor assembly is subjected to external forces (such as current driving the excitation winding 122 to generate a magnetic field), the rotor assembly will deviate from its equilibrium position and enter an unbalanced state. In this state, the pole faces of the magnetic element 112 are no longer completely aligned with the stator core 121, resulting in a discontinuous magnetic flux path, increased magnetic reluctance, and decreased electromagnetic torque. This process is the critical stage for the rotor assembly to transition from one equilibrium position to another.

[0104] In a plane perpendicular to the rotation axis, the rotation center of the rotor assembly is used as the projection center. When the magnetic element 112 deflects at a predetermined angle, it moves towards the magnetic conductor, causing the center projection of the magnetic element 112 to at least partially overlap with the magnetic conductor. This ensures that even in an unbalanced position, the magnetic element 112 maintains a certain degree of magnetic flux path connection, thereby maintaining a certain electromagnetic torque output.

[0105] In one embodiment of this disclosure, in a plane perpendicular to the rotation axis, with the rotation center of the rotor assembly as the projection center, within the range of the reciprocating angular displacement of the rotor assembly, the central projection of the magnetic element 112 on its radial direction toward the projection center and the central projection of the magnetic conductive part on the radial direction toward the projection center of the stator core 121 always remain in a state of at least partial overlap.

[0106] Specifically, when the excitation winding 122 is energized to generate a magnetic field, the magnetic field drives the rotor assembly to swing from one equilibrium position to another. During this process, since the magnetic guide extends along the circumferential direction and aligns with the magnetic element 112, even at the maximum deflection angle, the projection of the magnetic element 112 always partially overlaps with the projection of the magnetic guide, thereby maintaining an effective magnetic flux path and continuous electromagnetic torque output. This configuration not only reduces magnetic resistance and leakage magnetic phenomena, but also allows for a larger swing angle, improving the overall efficiency and reliability of the system. It is particularly suitable for applications requiring vibration and large swing angles, such as electric toothbrushes, ensuring efficient and stable operation and excellent cleaning effect.

[0107] In one embodiment of this disclosure, the ends of the first magnetic conductor 1231 and the second magnetic conductor 1232 facing the magnetic component 112 are constructed as arc surfaces. The curvature of the arc surface can be matched and aligned with the first arc surface of the magnetic component 112, ensuring a more uniform distribution of the magnetic field between the magnetic conductor and the magnetic component 112, thereby improving the magnetic flux density and torque output.

[0108] In one embodiment of this disclosure, two stator cores 121 are provided, and the two stator cores 121 are configured to be symmetrically distributed; two magnetic elements 112 are provided, each magnetic element 112 corresponding to one stator core 121. For example, if the first magnetic element 112 is an N pole, the corresponding first stator core 121 is an S pole; if the second magnetic element 112 is an S pole, the corresponding second stator core 121 is an N pole, ensuring that the magnetic flux path is completely symmetrical on both sides and reducing magnetic reluctance differences. The symmetrical magnetic pole distribution can reduce torque fluctuations caused by stator and rotor magnetic pole misalignment (cogging effect), especially during low-speed or low-frequency operation, resulting in a smoother output.

[0109] Considering the mechanical structural stability of the drive component, in this embodiment, reference is made to... Figure 3The stator assembly includes an annular base 124, with the stator core 121 and magnetic conductive portion both constructed to extend radially from the inner side of the annular base 124 toward the rotor assembly. The annular configuration of the annular base 124 provides a stable mechanical support platform for the stator core 121 and the magnetic conductive portion, ensuring uniform distribution of each stator core along the circumferential direction and precise alignment with the magnetic components 112, thereby maintaining the symmetry of the magnetic field distribution. In this embodiment, the annular base 124 itself can be made of a highly permeable material or integrate magnetic conductive channels, effectively collecting and conducting the magnetic flux generated by the stator core 121 to the magnetic conductive portion, forming a closed magnetic circuit, reducing leakage magnetic loss, and improving magnetic field utilization. Its annular heat dissipation surface is also more conducive to the uniform diffusion of heat from the drive assembly 1. This not only enhances the magnetic field driving performance but also allows the stator assembly to have a compact spatial layout, which is beneficial for the miniaturization and weight reduction of cleaning equipment.

[0110] In one embodiment of this disclosure, the end of the magnetic guide facing the rotor assembly is configured as an arc shape. The arc-shaped profile is highly matched with the motion trajectory of the magnetic component 112, effectively shortening the air gap length and expanding the effective magnetic pole contact area, thereby reducing magnetic resistance, enhancing magnetic flux density, and enabling magnetic field energy to be transferred to the rotor more efficiently, thus improving the response speed and output torque of the reciprocating drive.

[0111] In one embodiment of this disclosure, when the rotor assembly is in the balanced position, at least a portion of the magnetic element 112 cooperates with the magnetic conductive part to form a magnetic flux, and when the rotor assembly is in the unbalanced position, at least a portion of the magnetic element 112 cooperates with the magnetic conductive part to form a magnetic flux.

[0112] When the rotor assembly is in the equilibrium position, the excitation winding 122 is energized to form a static magnetic flux coupling between the magnetic conductor and the magnetic component 112, providing a preload for the reverse driving force. When the excitation current reverses and triggers a reversal of the magnetic field polarity, the magnetic component 112 is pulled away from the equilibrium position by a directional magnetic pull. During the motion, the magnetic flux path dynamically switches with the angle of the rotor assembly. The alternating coupling between the magnetic conductor and the magnetic component 112 maintains a continuous driving torque, driving the magnetic component 112 to accelerate to its maximum angular velocity. When approaching the reverse equilibrium position, the magnetic drag torque cancels out the inertial kinetic energy to achieve deceleration and return to the original position. At the same time, the excitation current reverses again, achieving dead-zone-free reverse drive through full-domain magnetic flux coverage. Based on this, magnetic flux coupling between the magnetic component 112 and the magnetic conductor exists at any position of the rotor assembly, ensuring uninterrupted transmission of magnetic field energy throughout the motion, avoiding driving force fluctuations or energy losses caused by momentary disconnection of the magnetic circuit, and significantly improving the continuity and energy efficiency of reciprocating motion.

[0113] In order to improve the speed of magnetic field response, in one embodiment of this disclosure, at least one first magnetic conductor 1121 is provided, and at least one first magnetic conductor 1121 and stator core 121 are spaced apart along a first circumferential direction; at least one second magnetic conductor 1122 is provided, and at least one second magnetic conductor 1122 and stator core 121 are spaced apart along a second circumferential direction; the first circumferential direction is opposite to the second circumferential direction.

[0114] The first magnetic conductor 1121 and the second magnetic conductor 1122 are distributed in opposite directions, forming symmetrical magnetic circuit branches. This arrangement allows the rotor assembly to quickly establish a closed magnetic circuit through the corresponding magnetic conductors during reciprocating rotation, regardless of the direction of movement (e.g., the first magnetic conductor 1121 is preferentially coupled during clockwise rotation, and the second magnetic conductor 1122 is coupled during counterclockwise rotation), reducing the path length for magnetic flux switching, lowering reluctance loss, and improving the magnetic field response speed. When the magnetic component 112 moves, its coupling degree with the magnetic conductors in different directions exhibits a gradient difference with the angle. For example, during clockwise rotation, the magnetic flux coupling with the first magnetic conductor 1121 gradually increases, while that with the second magnetic conductor 1122 gradually decreases, forming a directional change in magnetic reluctance. This gradient characteristic allows for precise control of the rotor's acceleration and deceleration processes during reciprocating motion, avoiding dead zones and improving drive stability. In addition, at the moment of reversal of the magnetic component 112 (such as from clockwise to counterclockwise), the first magnetic conductor 1121 and the second magnetic conductor 1122 alternately dominate the conduction of magnetic flux to achieve a smooth transition of the magnetic field direction, forming a "relay" effect of magnetic field switching, reducing the reversal impact force, and reducing vibration and noise.

[0115] Considering user experience, the operating frequency range of the drive component 1 is 100 Hz to 180 Hz. Existing conventional electric toothbrushes vibrate at 260 Hz; therefore, the operating frequency of the drive component 1 in this embodiment is relatively low. Firstly, using a low-frequency drive effectively avoids mechanical resonance phenomena that may be caused by high-frequency vibration, significantly improving the smoothness of rotation and preventing jerking. Secondly, while ensuring cleaning efficiency, it keeps the mechanical impact load within the safe range of the gum tolerance threshold, reducing damage to the user's gums and improving the user experience.

[0116] The unidirectional rotation angle of conventional electric toothbrushes is 5° to 6°. In this embodiment, by optimizing the structure of the drive component 1, the unidirectional rotation angle range of the drive shaft 111 relative to the stator core 121 is controlled within 0° to 30°. Within this range, the cleaning area can be increased without damaging the gums.

[0117] refer to Figure 1 and Figure 3The cleaning device also includes a transmission assembly 4, one end of which is releasably connected to the cleaning assembly 2, and the other end is connected to the drive shaft 111. Specifically, one end of the transmission assembly 4 can be releasably connected to the cleaning assembly 2 via a snap-fit ​​or magnetic adsorption interface, while the other end can be rigidly connected to the drive shaft 111. The drive shaft 111 inputs energy to the transmission assembly 4, causing the transmission assembly 4 to oscillate, thereby driving the cleaning assembly 2 to oscillate. In this embodiment, the cleaning device can be an electric toothbrush, the cleaning assembly 2 can be the brush head of the electric toothbrush, and the drive shaft 111 is releasably connected to the brush head of the electric toothbrush to facilitate regular brush head replacement by the user, improving user convenience.

[0118] In another embodiment of this disclosure, reference is made to Figures 1 to 3 A cleaning device is provided, comprising:

[0119] Drive assembly 1 includes a rotor assembly and a stator assembly. The stator assembly includes at least a pair of magnetizable stator cores 121 evenly distributed along the circumferential direction, and each stator core 121 is provided with an excitation winding 122, which is configured to generate an alternating magnetic field when energized. The rotor assembly includes a drive shaft 111 with a fluid flow channel and magnetic components 112 fixed relative to the drive shaft 111 and cooperating with the stator cores 121. The magnetic components 112 include a first magnet 1121 arranged circumferentially around the drive shaft 111 and cooperating with the same stator core 121, and a second magnet 1122. The magnet 1122, the first magnet 1121 and the second magnet 1122 have opposite polarities on the side facing the stator core 121, and at least a portion of the radially outer ends of the first magnet 1121 and the second magnet 1122 are curved bodies with opposite polarities that cooperate with the same stator core 121, the curved bodies having an outwardly pointing first arc shape; the stator assembly also includes magnetically conductive portions distributed circumferentially at intervals from the stator core 121, the magnetically conductive portions including a first magnetically conductive body 1231 for cooperating with the first magnet 1121 and a second magnetically conductive body 1232 for cooperating with the second magnet 1122;

[0120] In a plane containing the rotation axis of the rotor assembly, at least one plane is a plane of symmetry; an X-axis is defined located in the plane of symmetry and perpendicular to the rotation axis, and at least one pair of stator cores 121 are configured to be symmetrically distributed with respect to the X-axis;

[0121] The angle between the centerline of the first magnetic conductor 1231 and the X-axis, and the angle between the centerline of the second magnetic conductor 1232 and the X-axis are denoted as γ, and the central angle corresponding to the first arc is denoted as β. The following relationship is satisfied between γ and β: 0.125≤γ / β≤0.89;

[0122] Cleaning component 2 is coupled to drive component 1;

[0123] Power supply component 3 is configured to excite excitation winding 122 via an electrical signal.

[0124] In this embodiment, the cleaning device ensures that the drive assembly 1 maintains a stable reciprocating angular displacement motion state and achieves large swing angle output even when liquid continuously flows through the liquid flow channel of the drive shaft 111 during the operation of the drive assembly 1, which significantly improves the operational reliability and power output capability of the drive assembly 1 under complex working conditions.

[0125] In another embodiment of this disclosure, the cleaning device further includes a drive pump 12 connected to a liquid flow channel, the drive pump 12 being configured to pump cleaning fluid into the cleaning assembly 2 through the liquid flow channel.

[0126] In this embodiment, the drive shaft 111 has a fluid flow channel. The cleaning device also includes a housing 5, inside which a water tank 15 is provided. The water tank 15 can be used to hold cleaning fluid. A liquid inlet assembly 9 is also provided on the housing 5. During actual operation, the liquid inlet assembly 9 can be removed to inject cleaning fluid into the housing 5. A power supply bracket 10 is also provided in the inner cavity of the housing 5. The power supply bracket 10 is configured to accommodate the power supply assembly 3. The drive pump 12 is mounted on the body support. A first seal 13 and a second seal 14 are provided at both ends of the power supply bracket 10. Blind holes are provided on the power supply bracket 10. Fasteners 11 securely connect the body support and the power supply bracket 10 through the blind holes. The first seal 13 and the second seal 14 at both ends of the power supply bracket 10 divide the entire inner cavity of the housing 5 into dry and wet separation spaces. The upper part is a drying space for components such as the body support, PCB, and power source, while the lower part is used to accommodate the water tank 15. This design effectively separates wet and dry areas, enhances waterproof reliability, protects sufficient capacity, and allows for a shorter water tank 15, making cleaning the inside of the tank easier. The structure and working principle of other components of the cleaning equipment in this embodiment are the same as those of the aforementioned cleaning equipment, and will not be repeated here.

[0127] In another embodiment of this disclosure, a driving component 1 is provided.

[0128] refer to Figure 3 The drive assembly 1 may include a rotor assembly, a stator assembly, and a drive housing 18, wherein the drive housing 18 is used to house the rotor assembly and the stator assembly, and the stator assembly is coaxially fitted with the rotor assembly. The rotor assembly is used to convert electromagnetic energy into mechanical kinetic energy, and the stator assembly is used to establish a controllable electromagnetic field system.

[0129] The stator assembly includes at least one pair of magnetizable stator cores 121 evenly distributed along the circumferential direction, and each stator core 121 is provided with an excitation winding 122, which is configured to generate an alternating magnetic field when energized. When there are two or more stator cores 121, the stator cores 121 are usually evenly arranged in the circumferential direction of the rotor assembly to facilitate the cyclic rotation or reciprocating oscillation of the rotor assembly. The rotor assembly includes a drive shaft 111 and at least one pair of magnetic elements 112 fixed relative to the drive shaft 111 and cooperating with the stator cores 121. The magnetic elements 112 are configured to cause the rotor assembly to reciprocate angular displacement motion about its rotation axis under the drive of the alternating magnetic field. In this embodiment, the drive shaft 111 can be rotatably connected to the drive assembly 1 through a structure such as a bearing, so that the drive shaft 111 can rotate relative to the drive assembly 1.

[0130] Furthermore, in the existing structure, the swing angle of the rotor assembly is limited by the inherent pole width of the stator assembly. When the magnet swings to the edge, the alignment angle between the magnet and the stator core 121 is insufficient, resulting in a decrease in magnetic flux and unstable output torque. Based on this, reference... Figures 9 to 12 In this embodiment, the stator assembly further includes magnetically conductive portions spaced circumferentially from the stator core 121. These magnetically conductive portions extend radially toward the magnetic element 112 from the stator core 121. The magnetically conductive portions receive magnetic flux conducted by the stator core 121. When at least a portion of the magnetic element 112 engages with the magnetically conductive portions, magnetic flux is formed between the magnetic element 112 and the magnetically conductive portions. In this embodiment, the magnetically conductive portions can be made of a high-conductivity material and extend radially toward the magnetic element 112 from the stator core 121, forming a magnetic pole region directly aligned with the magnetic element 112, thereby expanding the effective coupling area between the magnetic element 112 and the stator core 121.

[0131] When the magnetic component 112 swings, the magnetic guide can extend the magnetic flux path from the main body area of ​​the stator core 121 to a larger range, thereby maintaining the continuity of magnetic flux within a larger angle range, improving the stability of the output torque of the drive assembly 1, and increasing the swing angle of the magnetic component 112, thereby increasing the swing angle of the cleaning assembly 2, thus enhancing the overall stability and flexibility of the cleaning equipment.

[0132] like Figure 3As shown, in the drive assembly 1, the end of the drive housing 18 is closed by the end cap 16, and the drive shaft 111 runs through both ends of the housing. The two ends are supported by a first bearing 17 and a second bearing 24, respectively. The transmission assembly 4 is connected to the drive shaft 111 via the first bearing 17, and a spring 23 is placed between them to provide preload or dampen vibration. The excitation winding 122 surrounds the drive shaft 111 and is fixed by a winding bracket 19 for support and heat dissipation. At the other end of the drive shaft 111, a magnetic sensing ring 21 is fixed to a magnetic ring seat 22 and engages with the second bearing 24 via a bushing 20 to detect position or speed signals and achieve precise alignment. All components are precisely connected to form a stable structure, ensuring that the drive assembly 1 has high rotational accuracy, low vibration, and reliable electrical performance.

[0133] Further, refer to Figures 4 to 12 The magnetic component 112 includes at least a first magnet 1121 and a second magnet 1122 arranged circumferentially around the drive shaft 111 and cooperating with the same stator core. The polarities of the first magnet 1121 and the second magnet 1122 facing the stator core 121 are opposite. Specifically, the drive shaft 111 passes through the rotor core 113. The outer side of the rotor core 113 is provided with a groove, the shape of which matches the first magnet 1121 and the second magnet 1122. The first magnet 1121 and the second magnet 1122 are at least partially disposed in the corresponding groove. At least a portion of the radially outer ends of the first magnet 1121 and the second magnet 1122 are curved bodies with opposite polarities that cooperate with the same stator core 121. Specifically, when the end of the first magnet 1121 facing the stator core 121 is the S pole, the end of the second magnet 1122 facing the stator core 121 is the N pole; or, when the end of the first magnet 1121 facing the stator core 121 is the N pole, the end of the second magnet 1122 facing the stator core 121 is the S pole. In this way, after the excitation winding 122 is energized and generates a magnetic field, the first magnet 1121 and the second magnet 1122 can reciprocate and rotate by a predetermined angle under the action of the magnetic field, thereby realizing the reciprocating oscillation of the drive component 1.

[0134] The magnetic conductive part includes a first magnetic conductive body 1231 for cooperating with the first magnet 1121, and a second magnetic conductive body 1232 for cooperating with the second magnet 1122.

[0135] In actual operation, when the excitation winding 122 is energized and generates a magnetic field, the magnetic field drives the first magnet 1121 and the second magnet 1122 to oscillate. During this process, when the first magnet 1121 moves closer to the first magnetic conductor 1231, the second magnet 1122 moves away from the second magnetic conductor 1232 until it reaches another equilibrium position. For example, driven by the magnetic field generated by the energized excitation winding 122, the first magnet 1121 (with the outer N pole) moves closer to the first magnetic conductor 1231 (with the S pole) due to the attractive force, while the second magnet 1122 (with the outer S pole) moves away from the second magnetic conductor 1232 (with the N pole) due to the repulsive force, forming a directional oscillation of the rotor assembly. When the direction of the magnetic field changes periodically (e.g., the current reverses), the polarity of the magnetic conductors reverses, driving the magnets to move in the opposite direction, thereby achieving reciprocating oscillation. By continuously overlapping the magnetic component 112 and the magnetic conductive part on the radial projection of the stator core 121, the magnetic flux path remains continuous, reducing magnetic resistance and leakage magnetic field, ensuring stable electromagnetic torque output, supporting large-angle oscillation and improving energy efficiency, and is suitable for scenarios such as electric toothbrushes that require efficient and stable vibration.

[0136] The specific work process is as follows:

[0137] When the drive assembly 1 is energized, the power supply assembly 3 excites the excitation winding 122 via an electrical signal, forming a closed magnetic circuit inside the stator core 121. The alternating magnetic field generated by the excitation winding 122 has a periodically changing magnetic pole direction. Specifically, when a positive current is applied to the excitation winding 122, the end of the stator core 121 exhibits N-pole magnetism; when the current direction is reversed, the magnetic pole synchronously switches to S-pole. The first magnet 1121 and the second magnet 1122, which cooperate with it, are respectively fixedly provided with opposite permanent magnet polarities, wherein the outer end of the first magnet 1121 is an N-pole permanent magnet, and the outer end of the second magnet 1122 is an S-pole permanent magnet (or vice versa).

[0138] During the electromagnetic drive phase, when the excitation winding 122 of the stator core 121 is excited to the N pole, the magnetic field it generates repulsively interacts with the N pole of the first magnet 1121 and attracts the S pole of the second magnet 1122, forming a combined torque that causes the rotor to rotate clockwise. When the rotor rotates to a certain angle, the repulsive force between the first magnet 1121 and the stator core 121 weakens, and the first magnet 1121 attracts the first magnetic conductor 1231, driving the first magnet 1121 to continue deflecting. When the current direction is reversed, causing the stator core 121 to become the S pole, the magnetic field attracts the N pole of the first magnet 1121 and repulses the S pole of the second magnet 1122, forming a counterclockwise rotational torque. When the rotor rotates to a certain angle, the repulsive force between the second magnet 1122 and the stator core 121 weakens, and the second magnet 1122 attracts the second magnetic conductor 1232, continuing to deflect. By continuously switching the direction of the excitation current, the drive shaft 111 performs stable reciprocating motion within the set swing angle range.

[0139] refer to Figure 10 , Figure 12 In the plane containing the rotation axis of the rotor assembly, at least one plane is a plane of symmetry, defining an X-axis located in the plane of symmetry and perpendicular to the rotation axis; at least one pair of stator cores 121 are constructed to be symmetrically distributed with respect to the X-axis. The symmetrical arrangement of the stator cores 121 ensures symmetrical distribution of magnetic poles, so that the first magnet 1121 and the second magnet 1122 are subjected to symmetrical magnetic forces during oscillation in both directions, avoiding torque fluctuations caused by uneven magnetic resistance.

[0140] refer to Figure 10 , Figure 12 The angle between the centerline of the first magnetic conductor 1231 and the X-axis, and the angle between the centerline of the second magnetic conductor 1232 and the X-axis are denoted as γ. The central angle corresponding to the first arc is denoted as β. γ and β satisfy the following relationship: 0.125≤γ / β≤0.89.

[0141] By limiting the ratio of γ to β, the magnetic flux distribution density in the magnetic conductor can be balanced, local magnetic saturation can be avoided, the continuity and closure of the magnetic field path can be ensured, magnetic leakage can be reduced, and energy transfer efficiency can be improved. Furthermore, the constraint relationship between γ and β makes the coupling between the magnetic conductor and the magnet smoother during rotation, reduces torque fluctuations caused by sudden changes in magnetic reluctance, lowers vibration and noise caused by magnetic field asymmetry, and improves the operational stability of the cleaning equipment.

[0142] The inventors discovered during their research and development that in existing technologies, when a user applies a large load, such as vigorously brushing teeth with an electric toothbrush, the load is transmitted through the brush head to the rotor. The motor may then be unable to overcome the load, causing the rotor to stop oscillating or its oscillation angle to decrease significantly, resulting in poor cleaning performance. However, due to… Figure 13 and Figure 14It can be seen that when the driving parameters are the same (such as the same voltage), at the same frequency, as the load increases, the swing angle of the driving component 1 provided in this embodiment shows a relatively small change, rather than a sudden decrease with the increase of load, indicating that the driving component 1 in this embodiment has good load resistance. For example, under 130Hz conditions, when the load increases from 0 to 2, the swing angle increases from 14° to 15°, and then slowly decreases to 13° when the load increases to 4. The change in swing angle does not exceed 10%, which meets the swing angle requirements for oral cleaning. Similarly, under 160Hz conditions, as the load increases from 0 to 3, the swing angle continues to rise (cumulative increase of 3°). Not only does it not stop under pressure, but it can also appropriately increase the swing angle when the user applies greater force, thereby improving the cleaning power. This indicates that the driving component 1 has stronger adaptability to the increase of load. This characteristic further strengthens the advantage of the driving component 1's load resistance, that is, it can still maintain the stability of the brush head swing angle under different pressures, and can still resist the swing angle decay caused by external pressure under large loads, reducing the fluctuation of cleaning effect. Furthermore, the fluctuation in the brush head's oscillation angle is minimal under different load conditions, almost imperceptible to the user, providing a superior cleaning experience. In addition, due to... Figure 13 and Figure 14 It can be seen that the input current of drive component 1 is linearly related to the operating frequency, and the swing angle also maintains a stable linear response as the frequency changes. This linear correlation characteristic can ensure vibration stability under different operating conditions, maintain the uniformity of cleaning force, and extend the service life of drive component 1.

[0143] Figure 15 This is an experimental data distribution diagram of the current-load of the drive component 1 and the comparison motor provided in one embodiment of this disclosure. Under the same voltage conditions, the drive component 1 and the comparison motor are driven with a preset duty cycle. As the load increases along the horizontal axis, the current of the drive component 1 generally shows a significant decreasing trend with the increase of the load, indicating that its power consumption is lower and the motor efficiency is higher. This characteristic can effectively save energy, extend the battery life in applications such as electric toothbrushes, and even help to reduce the size of the product. In contrast, the current of the comparison motor is significantly higher than that of the drive component 1, and it first decreases slightly and then increases sharply with the increase of the load, resulting in a significant increase in power consumption, higher energy consumption, and lower efficiency. Under the same energy source, the drive component 1 can obviously operate for a longer time and provide a more stable swing angle.

[0144] Figure 16The diagram shows the swing angle-load test data distribution of the drive component 1 provided in one embodiment of this disclosure and the comparative motor. As the horizontal axis extends, the load increases. Using the same voltage, the swing angle of the drive component 1 changes very smoothly with increasing load at different frequencies, demonstrating excellent load resistance and stability. In contrast, the comparative motor shows a sharp drop in swing angle at different frequencies within the same load range, indicating that its performance is easily affected by load fluctuations. The stable swing angle characteristic of the drive component 1 ensures that the electric toothbrush can maintain the consistency of the brush head swing amplitude under different pressures, without erratic swinging, thereby improving cleaning effect and user experience. The comparison of the two diagrams further highlights the comprehensive advantages of the drive component 1 in terms of energy efficiency and load resistance performance in this embodiment.

[0145] Figure 17 The linear relationship between the output torque of the drive component 1 and the rotor position is shown in this embodiment, wherein the output torque is the superposition of the cogging torque (caused by the change in magnetic reluctance of the drive component 1) and the electromagnetic torque. Figure 17 As can be seen, from the center position of the horizontal axis (0 point) to both sides, that is, in the first and second directions of the swing angle (angular displacement motion), the electromagnetic torque can maintain stability within a large angle range. This large angle range is at least 30° rotation in the first direction and 30° rotation in the second direction, totaling 60° in both directions. Therefore, the drive component 1 can achieve smooth output of angular displacement motion within a large angle range, and the control precision is high. Compared to the existing technology with a combined swing angle of 10° to 12° in both directions, the drive component 1 in this embodiment exhibits the advantages of a larger angle and greater stability. Within the aforementioned large angle range, the cogging torque of the drive component 1 in this embodiment increases or decreases stably with the angle change of the motor shaft rotation. Combined with the stable electromagnetic torque, this achieves stable angular displacement motion output with strong load resistance. For example, along the first direction, the cogging torque increases linearly and smoothly as the swing angle increases. Combined with the relatively stable electromagnetic torque, this achieves smooth changes in output torque, thereby achieving smooth and stable swing angle control and achieving high-precision control. The drive component 1 of this application embodiment is suitable for small devices with high requirements for vibration stability and control precision, such as electric toothbrushes. By optimizing the superposition effect of cogging torque and electromagnetic torque, operating noise can be reduced and vibration smoothness improved, thereby enhancing the user experience.

[0146] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this disclosure is not limited to the described order of actions, because according to this disclosure, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this disclosure.

[0147] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0148] The preferred embodiments disclosed above are merely illustrative of this disclosure. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this disclosure. These embodiments are selected and specifically described in this disclosure to better explain the principles and practical applications of this disclosure, thereby enabling those skilled in the art to better understand and utilize this disclosure. This disclosure is limited only by the claims and their full scope and equivalents.

Claims

1. A cleaning device, characterized in that, include: The drive assembly (1) includes a rotor assembly and a stator assembly. The stator assembly includes at least one pair of magnetizable stator cores (121) evenly distributed along the circumferential direction, and each stator core (121) is provided with an excitation winding (122). The excitation winding (122) is configured to generate an alternating magnetic field when energized. The rotor assembly includes a drive shaft (111) and magnetic elements (112) fixed relative to the drive shaft (111) and cooperating with the stator cores (121). The magnetic elements (112) include a first magnet (1121) and a second magnet (1122) arranged circumferentially around the drive shaft (111) and cooperating with the same stator core (121). 22), the first magnet (1121) and the second magnet (1122) have opposite polarities on the side facing the stator core (121), and at least a portion of the radially outer ends of the first magnet (1121) and the second magnet (1122) are curved bodies with opposite polarities that cooperate with the same stator core (121), the curved bodies having an outwardly pointing first arc shape; the stator assembly also includes magnetically conductive portions distributed circumferentially at intervals from the stator core (121), the magnetically conductive portions including a first magnetically conductive body (1231) for cooperating with the first magnet (1121), and a second magnetically conductive body (1232) for cooperating with the second magnet (1122). In a plane containing the rotation axis of the rotor assembly, at least one plane is a plane of symmetry; an X-axis is defined located in the plane of symmetry and perpendicular to the rotation axis, and at least one pair of the stator cores (121) are configured to be symmetrically distributed with respect to the X-axis; Wherein, the angle between the centerline of the first magnetic conductor (1231) and the X-axis, and the angle between the centerline of the second magnetic conductor (1232) and the X-axis are denoted as γ, and the central angle corresponding to the first arc is denoted as β. The following relationship is satisfied between γ and β: 0.125≤γ / β≤0.89; Cleaning component (2) coupled to the drive component (1); Power supply component (3), which is configured to excite the excitation winding (122) by means of an electrical signal.

2. The cleaning equipment according to claim 1, characterized in that, in, The following relationship exists between γ and β: 0.22 ≤ γ / β ≤ 0.

5.

3. The cleaning equipment according to claim 1, characterized in that, in, The value of γ ranges from 10° to 40°.

4. The cleaning equipment according to claim 1, characterized in that, in, The value of β ranges from 45° to 80°.

5. The cleaning equipment according to claim 1, characterized in that, The angle between the centerline of the first magnet (1121) and the X-axis is denoted as Ω, where the value of Ω ranges from 45° to 50°; the angle between the centerline of the second magnet (1122) and the X-axis is denoted as Ω, where the value of Ω ranges from 45° to 50°.

6. The cleaning equipment according to claim 1, characterized in that, The angle between the line segment from the outermost edge of the stator core (121) to the center of the rotor assembly and the X-axis is denoted as φ, where the value of φ ranges from 40° to 55°.

7. The cleaning equipment according to claim 1, characterized in that, The curved body has an inwardly pointing third arc and two side edges that connect the corresponding ends of the first arc and the third arc; the central angles of the first arc and the third arc are the same.

8. The cleaning equipment according to claim 7, characterized in that, The air gap width between the first arc of the first magnet (1121) and the second magnet (1122) and the end of the stator core (121) facing the magnetic component (112) is denoted as d, where the value of d ranges from 0.15 mm to 0.5 mm.

9. The cleaning equipment according to claim 7, characterized in that, The stator core (121) has one end close to the first magnet (1121) and the second magnet (1122) that cooperates with the curved body and has an outwardly pointing second arc; the central angle corresponding to the second arc is denoted as θ, where the value of θ ranges from 70° to 100°.

10. The cleaning equipment according to claim 1, characterized in that, The rotor assembly has a balanced position that cooperates with the stator core (121) and an unbalanced position that deviates from the stator core (121); in a plane perpendicular to the axis of rotation, with the rotation center of the rotor assembly as the projection center, the magnetic element (112) is configured to deflect by a predetermined angle and move so that its central projection in its radial direction toward the projection center at least partially overlaps with the magnetic conductive part.

11. The cleaning equipment according to claim 1, characterized in that, It also includes a transmission assembly (4), one end of which is releasably connected to the cleaning assembly (2), and the other end is connected to the drive shaft (111).

12. The cleaning equipment according to claim 1, characterized in that, The frequency range of the drive component (1) in operation is 100 Hz to 180 Hz.

13. The cleaning equipment according to claim 1, characterized in that, The unidirectional rotation angle of the drive shaft (111) relative to the stator core (121) is 0° to 30°.

14. A cleaning device, characterized in that, include: The drive assembly (1) includes a rotor assembly and a stator assembly. The stator assembly includes at least a pair of magnetizable stator cores (121) evenly distributed along the circumferential direction, and each stator core (121) is provided with an excitation winding (122), which is configured to generate an alternating magnetic field when energized. The rotor assembly includes a drive shaft (111) having a fluid flow channel and a magnetic element (112) fixed relative to the drive shaft (111) and cooperating with the stator core (121). The magnetic element (112) includes a first magnet (1121) and a second magnet arranged circumferentially around the drive shaft (111) and cooperating with the same stator core (121). (1122) The first magnet (1121) and the second magnet (1122) have opposite polarities on the side facing the stator core (121). At least a portion of the radial outer ends of the first magnet (1121) and the second magnet (1122) are curved bodies with opposite polarities that cooperate with the same stator core (121). The curved bodies have an outwardly pointing first arc shape. The stator assembly also includes magnetically conductive portions that are spaced apart from the stator core (121) in the circumferential direction. The magnetically conductive portions include a first magnetically conductive body (1231) for cooperating with the first magnet (1121) and a second magnetically conductive body (1232) for cooperating with the second magnet (1122). In a plane containing the rotation axis of the rotor assembly, at least one plane is a plane of symmetry; an X-axis is defined located in the plane of symmetry and perpendicular to the rotation axis, and at least one pair of the stator cores (121) are configured to be symmetrically distributed with respect to the X-axis; Wherein, the angle between the centerline of the first magnetic conductor (1231) and the X-axis, and the angle between the centerline of the second magnetic conductor (1232) and the X-axis are denoted as γ, and the central angle corresponding to the first arc is denoted as β. The following relationship is satisfied between γ and β: 0.125≤γ / β≤0.89; Cleaning component (2) coupled to the drive component (1); Power supply component (3), which is configured to excite the excitation winding (122) by means of an electrical signal.

15. The cleaning equipment according to claim 14, characterized in that, It also includes a drive pump connected to the liquid flow channel, the drive pump being configured to pump cleaning fluid into the cleaning assembly (2) through the liquid flow channel.

16. A driving component (1), characterized in that, The driving component (1) includes: A stator assembly comprising at least a pair of magnetizable stator cores (121) uniformly distributed along the circumferential direction, and each stator core (121) being provided with an excitation winding (122) configured to generate an alternating magnetic field when energized. A rotor assembly, comprising a drive shaft (111) and a magnetic element (112) fixed relative to the drive shaft (111) and cooperating with the stator core (121); the magnetic element (112) comprises a first magnet (1121) and a second magnet (1122) arranged circumferentially around the drive shaft (111) and cooperating with the same stator core (121), the first magnet (1121) and the second magnet (1122) having opposite polarities on the side facing the stator core (121), the first magnet... At least a portion of the radially outer ends of the stator core (1121) and the second magnet (1122) are curved bodies with opposite polarities that cooperate with the same stator core (121), the curved bodies having an outwardly pointing first arc shape; the stator assembly also includes magnetically conductive portions spaced apart from the stator core (121) in the circumferential direction, the magnetically conductive portions including a first magnetically conductive body (1231) for cooperating with the first magnet (1121), and a second magnetically conductive body (1232) for cooperating with the second magnet (1122). In a plane containing the rotation axis of the rotor assembly, at least one plane is a plane of symmetry; an X-axis is defined located in the plane of symmetry and perpendicular to the rotation axis, and at least one pair of the stator cores (121) are configured to be symmetrically distributed with respect to the X-axis; The angle between the centerline of the first magnetic conductor (1231) and the X-axis, and the angle between the centerline of the second magnetic conductor (1232) and the X-axis are denoted as γ, and the central angle corresponding to the first arc is denoted as β. The following relationship is satisfied between γ and β: 0.125≤γ / β≤0.89.

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