Drive motor

Abstract

The utility model discloses a driving motor, which comprises a casing, an output shaft is rotatably arranged on a casing frame, a rotor assembly is matched on the output shaft, a stator assembly corresponding to the rotor assembly is arranged in the casing, the rotor assembly comprises an iron core and a permanent magnet, an accommodating groove is arranged on the side wall of the iron core, and the permanent magnet is arranged in the accommodating groove. A containing groove is formed in the iron core, the permanent magnet is installed in the containing groove, a connecting hole is formed in the center of the iron core, the iron core is connected with the output shaft through the connecting hole, a receding groove is formed in the position, between the connecting hole and the containing groove, of the iron core, and the receding groove is communicated with the connecting hole. The iron core is simple in structure and more reasonable in layout design, and the magnetic gathering effect of the structure is improved.

Description

Technical Field

[0001] The utility model relates to a driving motor. Background Art

[0002] The drive motor is the core power component of an electric toothbrush, responsible for converting electrical energy into mechanical vibrations, driving the toothbrush head for cleaning. The basic principle is electromagnetic conversion: When energized, the coil within the motor generates a magnetic field, which interacts with the permanent magnet (or stator magnetic field), producing periodic attractive or repulsive forces. This drives the eccentric wheel or vibrating shaft into high-frequency motion, ultimately transmitting the vibrations to the toothbrush head. Existing iron core structures suffer from significant magnetic field concentration deficiencies due to uneven magnetic permeability distribution and high magnetic resistance. This reduces electromagnetic conversion efficiency, preventing the magnetic field energy from being effectively concentrated on the vibrating component. This causes the mechanical vibration intensity of the motor output to attenuate, resulting in poor vibration output at the output end. Furthermore, the actual vibration amplitude of the motor often deviates from the design standard value, with frequency errors exceeding ±5% during high-frequency operation. This increases the difficulty of system control and makes it difficult for the controller's preset frequency adjustment algorithm to accurately match the actual vibration state, thus affecting the response speed of the switching control and the performance of the structure. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a driving motor with a simple iron core structure and a more reasonable layout design, thereby improving the magnetic field concentration effect of the structure.

[0004] To achieve the above-mentioned purpose, the utility model provides a driving motor, including a casing, an output shaft rotatably provided on the casing frame, a rotor assembly being matched with the output shaft, a stator assembly being provided in the casing corresponding to the rotor assembly, the rotor assembly including an iron core and a permanent magnet, the iron core being provided with a receiving groove provided on the side wall, the permanent magnet being installed in the receiving groove, a connecting hole being provided in the center of the iron core, the iron core being connected to the output shaft through the connecting hole, an air avoidance groove being provided between the connecting hole and the receiving groove, and the air avoidance groove being connected to the connecting hole.

[0005] The beneficial effects of this arrangement are as follows: by providing the air-avoidance slot, the magnetic circuit is made more stable and the magnetic short-circuit path between the permanent magnet and the output shaft is effectively cut off. In traditional structures, the iron core, as a metal component, is prone to forming a magnetic bypass, resulting in a loss of magnetic flux. The air-avoidance slot confines the magnetic circuit to the permanent magnet, the stator air gap, and the main circuit of the iron core, thereby increasing the air gap magnetic density and significantly enhancing the electromagnetic driving force. This design also reduces the magnetic field distortion caused by the magnetic conduction of the output shaft. Further, the air-avoidance slot can form a new heat dissipation channel to improve the heat dissipation efficiency of the structure. At the same time, the shape of the air-avoidance slot can be optimized through topology to make the overall structure lightweight and effectively improve the energy efficiency ratio. In addition, this structure is simple, easy to implement, and has a good use effect.

[0006] As a further configuration of the present invention, the opening edge of the accommodating groove and the side wall of the iron core are connected by an inclined wall, and a boss is provided on the inclined wall at the opening of the accommodating groove.

[0007] The beneficial effects of such a setting are as follows: by arranging a boss at the opening of the receiving groove of the inclined wall, the gap distance between the iron core and the stator assembly can be accurately controlled, and the air gap is usually stably controlled within a reasonable range. Such a setting allows the iron core to be as close to the stator as possible, shortening the magnetic circuit path to reduce magnetic resistance, and avoids direct contact between the two through the physical isolation of the boss, thereby improving the utilization rate of the magnetic flux; in terms of magnetic conductivity, the boss can guide the direction of the magnetic field, reduce magnetic leakage, enhance the magnetic concentration effect, and make the electromagnetic driving force more concentrated; in terms of structural protection, the boss can buffer vibration impact, protect the permanent magnet in the receiving groove from extrusion damage, and extend the life of the component; in terms of assembly accuracy, the boss can be used as a positioning reference to reduce the alignment error during installation of the iron core and improve the consistency of mass production; at the same time, the combined design of the inclined wall and the boss optimizes the force distribution of the iron core, reduces stress concentration under high-frequency vibration, and further improves structural stability.

[0008] As a further configuration of the present invention, the air avoidance groove is configured in a flat shape, one side of the air avoidance groove is connected to the connecting hole, and the other side of the air avoidance groove is configured close to the accommodating groove.

[0009] This arrangement effectively reduces the thickness of the gap between the connection hole and the accommodating slot, significantly reducing obstruction in the non-magnetic region of the magnetic circuit. This design reduces the dispersion of the magnetic field within the metal mass, concentrating the magnetic flux in the main magnetic path between the permanent magnet and the stator, thereby enhancing magnetic field concentration. Furthermore, the flat structure increases the heat dissipation area of ​​the air gap, helping to reduce heat generated by high-frequency vibration. Its symmetrical layout also balances the mass's center of gravity, reducing vibration eccentricity, lowering operating noise, and improving the overall dynamic stability of the structure.

[0010] As a further configuration of the present invention, one end of the iron core is connected to the output shaft, and the other end is connected to a plug interface, the plug interface is connected to the connecting hole, an elastic sheet is inserted on the plug interface, and the free end of the elastic sheet is connected to a positioning block.

[0011] The beneficial effects of this arrangement are: with this arrangement, the connection design between the plug interface and the connecting hole ensures the coaxiality of the structure, the elastic deformation of the elastic sheet can absorb high-frequency vibration energy, and combined with the inertial damping effect of the positioning block, this structure allows the vibration impact to be gradually released through the elastic sheet, reducing the stress concentration at the connection between the output shaft and the iron core, and extending the service life of the structure.

[0012] As a further configuration of the present invention, wing plates are formed on both sides of the elastic sheet, and the edges of the wing plates are blocked on the accommodating groove.

[0013] The beneficial effect of such a setting is that the wing plate structure can assist in positioning the permanent magnet, thereby preventing the permanent magnet from being displaced due to long-term vibration, which affects the reliability of the structure. The structure is simple, easy to implement, and has good use effect.

[0014] As a further configuration of the present invention, a base is provided on the housing, a cavity is formed in the base, and the positioning block is provided in the cavity.

[0015] The beneficial effect of such an arrangement is that such an arrangement and such a closed layout make the structure more airtight and improve the reliability of the structure. At the same time, the structure is simple, easy to produce and process, and has a good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0017] Figure 2 This is a schematic structural diagram of the rotor assembly in an embodiment of the present utility model;

[0018] Figure 3 This is a front view of the iron core in the embodiment of the present utility model;

[0019] Figure 4 It is a schematic diagram of the overall structure of the output shaft in an embodiment of the present utility model. DETAILED DESCRIPTION

[0020] The embodiment of the drive motor of the utility model is as follows Figures 1 to 4As shown: it includes a casing 1, on which an output shaft 3 is rotatably provided, and a rotor assembly is matched on the output shaft 3. A stator assembly is provided in the casing 1 corresponding to the rotor assembly, and the rotor assembly includes an iron core 4 and a permanent magnet 5. The iron core 4 is provided with a receiving groove 45 on the side wall, and the permanent magnet 5 is installed in the receiving groove 45. A connecting hole 41 is opened in the center of the iron core 4, and the iron core 4 is connected to the output shaft 3 through the connecting hole 41. The iron core 4 is provided with an air avoidance groove 42 between the connecting hole 41 and the receiving groove 45, and the air avoidance groove 42 is connected to the connecting hole 41. The beneficial effect of such a setting is that, by setting the air-avoidance slot 42, the magnetic circuit is made more stable and the magnetic short-circuit path between the permanent magnet 5 and the output shaft 3 is effectively cut off. In the traditional structure, the iron core 4, as a metal component, is prone to form a magnetic bypass, resulting in a loss of magnetic flux. The air-avoidance slot 42 confines the magnetic circuit to the permanent magnet 5, the stator air gap and the main circuit of the iron core 4, thereby increasing the air gap magnetic density and significantly enhancing the electromagnetic driving force. This design also reduces the magnetic field distortion caused by the magnetic conduction of the output shaft 3. Furthermore, a new heat dissipation channel can be formed through the air-avoidance slot 42 to improve the heat dissipation efficiency of the structure. At the same time, the shape of the air-avoidance slot 42 can be optimized by topology to make the overall structure lightweight and effectively improve the energy efficiency ratio. Moreover, this structure is simple, easy to implement and has a good use effect.

[0021] As a further configuration of this embodiment, the opening edge of the accommodating groove 45 is connected to the side wall of the iron core 4 via an inclined wall 43 , and a boss 44 is provided on the inclined wall 43 at the opening of the accommodating groove 45 . The beneficial effects of such a setting are as follows: by arranging a boss 44 at the opening of the receiving groove 45 of the inclined wall 43, the gap distance between the iron core 4 and the stator assembly can be accurately controlled, and the air gap is usually stably controlled within a reasonable range. Such a setting allows the iron core 4 to be as close to the stator as possible, shortening the magnetic circuit path to reduce magnetic resistance, and avoids direct contact between the two through the physical isolation of the boss 44, thereby improving the utilization rate of the magnetic flux; in terms of magnetic conductivity, the boss 44 can guide the direction of the magnetic field, reduce magnetic leakage, enhance the magnetic concentration effect, and make the electromagnetic driving force more concentrated; in terms of structural protection, the boss 44 can buffer vibration impact, protect the permanent magnet 5 in the receiving groove 45 from extrusion damage, and extend the life of the component; in terms of assembly accuracy, the boss 44 can be used as a positioning reference to reduce the alignment error during installation of the iron core 4 and improve the consistency of mass production; at the same time, the combined design of the inclined wall 43 and the boss 44 optimizes the force distribution of the iron core 4, reduces stress concentration under high-frequency vibration, and further improves structural stability.

[0022] As a further configuration of this embodiment, the air-avoidance groove 42 is configured in a flat shape, one side of the air-avoidance groove 42 is connected to the connecting hole 41, and the other side of the air-avoidance groove 42 is configured close to the receiving groove 45. The beneficial effect of this configuration is that it effectively reduces the thickness of the gap wall between the connecting hole 41 and the receiving groove 45, greatly reducing the obstruction of the non-magnetic conductive area in the magnetic circuit. This design reduces the dispersion of the magnetic field in the metal mass block, making the magnetic flux more concentrated in the main magnetic circuit between the permanent magnet 5 and the stator, thereby improving the magnetic concentration effect. At the same time, the flat structure increases the heat dissipation area of ​​the air-avoidance groove 42, helping to reduce the heat generated by high-frequency vibration; its symmetrical layout can also balance the center of gravity of the mass block, reduce vibration eccentricity, reduce operating noise, and improve the dynamic stability of the overall structure.

[0023] As a further feature of this embodiment, one end of the iron core 4 is connected to the output shaft 3, and the other end is connected to a plug socket. The plug socket is connected to the connecting hole 41. An elastic piece 6 is inserted into the plug socket, and the free end of the elastic piece 6 is connected to a positioning block 61. The beneficial effect of this arrangement is that the connection between the plug socket and the connecting hole 41 ensures structural coaxiality. The elastic deformation of the elastic piece 6 can absorb high-frequency vibration energy. Combined with the inertial damping effect of the positioning block 61, this structure allows vibration shock to be gradually released through the elastic piece 6, reducing stress concentration at the connection between the output shaft 3 and the iron core 4 and extending the service life of the structure.

[0024] As a further feature of this embodiment, wings 62 are formed on both sides of the elastic sheet 6, and the edges of the wings 62 are positioned to block the accommodating groove 45. This configuration has the following advantages: the wings 62 assist in positioning the permanent magnet 5, preventing the permanent magnet 5 from being displaced due to prolonged vibration, which would affect the reliability of the structure. Furthermore, the structure is simple, easy to implement, and has good performance.

[0025] As a further feature of this embodiment, the housing 1 is provided with a base 2, the base 2 having a chamber formed therein, and the positioning block 61 is disposed within the chamber. This configuration has the beneficial effect of enhancing the airtightness of the structure and improving its reliability. Furthermore, the structure is simple, easy to manufacture, and has a good performance.

[0026] The above example is only one preferred specific example of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A drive motor comprising a housing, an output shaft rotatably mounted on the housing frame, a rotor assembly fitted on the output shaft, and a stator assembly disposed in the housing corresponding to the rotor assembly, characterized in that: The rotor assembly includes an iron core and a permanent magnet. The iron core is provided with a receiving groove on the side wall, and the permanent magnet is installed in the receiving groove. A connecting hole is opened in the center of the iron core, and the iron core is connected to the output shaft through the connecting hole. The iron core is provided with an air avoidance groove between the connecting hole and the receiving groove, and the air avoidance groove is connected to the connecting hole.

2. The drive motor according to claim 1, wherein: The opening edge of the accommodating groove and the side wall of the iron core are connected by an inclined wall, and a boss is provided on the inclined wall at the opening of the accommodating groove.

3. The drive motor according to claim 2, wherein: The air-avoiding groove is arranged in a flat shape, one side of the air-avoiding groove is communicated with the connecting hole, and the other side of the air-avoiding groove is arranged close to the accommodating groove.

4. The drive motor according to claim 3, wherein: One end of the iron core is connected to the output shaft, and the other end is connected to a plug interface, which is communicated with the connecting hole. An elastic piece is inserted into the plug interface, and the free end of the elastic piece is connected to a positioning block.

5. The driving motor according to claim 4, characterized in that: Wing plates are formed on both sides of the elastic sheet, and edges of the wing plates are blocked on the accommodating groove.

6. The driving motor according to claim 4, wherein: The housing is provided with a base, a cavity is formed in the base, and the positioning block is provided in the cavity.

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