A radial flux brushless motor

Abstract

The utility model discloses a radial magnetic flux brushless motor, including the casing, the inner wall in casing is fixedly connected with stator core on the circumference, and the stator core has a plurality of copper wire windings in the radial direction of the heart, and a plurality of copper wire windings form corresponding radial magnetic field, and the center of casing is rotatably connected with rotor core, and the rotor core has a plurality of magnetic mechanisms in the circumference close to stator core, and the magnetic field of a plurality of magnetic mechanisms distributes along the radial direction, and the number of copper wire winding is different from the number of magnetic mechanism, and the axis of rotor core is fixedly connected with a rotating output shaft, and the output end of rotating output shaft is fixedly connected with eccentric cam for driving. The utility model provides a radial magnetic flux brushless motor in the process of stable driving, and the radial magnetic flux brushless motor has small abrasion and long service life.

Description

Technical Field

[0001] This utility model relates to the field of motors, specifically a radial flux brushless motor. Background Technology

[0002] In existing air suspension systems, brushed motors are the primary drive mechanism. While brushed motors are responsive and produce minimal vibration at startup, they generate significant friction during stable operation, leading to substantial energy loss, poor driving performance, and unpleasant noise, vibration, and acoustic roughness, resulting in a poor user experience. Furthermore, the continuous contact and friction of brushed motors can generate electrical sparks, causing radio interference. Additionally, the brushes wear down and require regular replacement, resulting in a shorter lifespan. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a radial flux brushless motor that has a stable driving process, low wear, and long life.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: a radial flux brushless motor, including a housing, a stator core fixedly connected to the inner wall of the housing in the circumferential direction, a plurality of copper wire windings uniformly arranged in the radial direction of the stator core, the plurality of copper wire windings forming a corresponding radial magnetic field, a rotor core rotatably connected to the center of the housing, a plurality of magnetic mechanisms uniformly arranged in the circumferential direction of the rotor core near the stator core, the magnetic field of the plurality of magnetic mechanisms being distributed radially, the number of copper wire windings being different from the number of magnetic mechanisms, a rotating output shaft fixedly connected to the axis of the rotor core, and an eccentric cam for driving fixedly connected to the output end of the rotating output shaft.

[0005] Compared with the prior art, the advantages of this utility model are as follows: By using the difference in the number of copper wire windings and magnetic mechanisms, as well as the magnetic transformation of the copper wire windings, an attraction transformation is formed on the magnetic mechanisms, thereby achieving the rotational driving effect on the rotor core. Each magnetic mechanism forms a closed magnetic field on the rotor core. When the closed magnetic field of the magnetic mechanism coincides with the magnetic field lines of the closed magnetic field of the stator core, the attraction of the stator core to the magnetic mechanism is the greatest. Due to the design of the difference in the number of magnetic mechanisms, the attraction force on the rotor core cannot be balanced, thus causing the rotor core to rotate. When the rotor core is subjected to the changing magnetic field of the copper wire windings, a relatively smooth circumferential force can be formed, that is, the fluctuation of the circumferential force is small, which is beneficial to the rotational stability of the rotor core. In high-speed applications, the torque / power density can be increased by utilizing reluctance torque to meet the requirements of weak magnetic field to achieve high-speed performance, thereby achieving the purpose of high-performance drive.

[0006] As an improvement of this utility model, the outer edge of the rotor core is provided with several smooth concave surfaces. The number of concave surfaces is the same as the number of magnetic mechanisms. Through this improvement, an uneven air gap is formed between the rotor core and the stator core, which can make the magnetic field of the rotor core form a sinusoidal influence, thereby reducing the output torque and torque pulsation of the rotating output shaft.

[0007] As an improvement of this utility model, each of the magnetic mechanisms is provided with a magnetic isolation bridge at its end. The magnetic isolation bridge is located on the side of the magnetic mechanism close to the stator core. Through this improvement, the leakage magnetic flux between poles is reduced, the magnetic flux amplitude of the magnetic field is increased, and thus the motor performance is improved.

[0008] As an improvement of this utility model, the magnetic mechanism includes a first permanent magnet with a rectangular cross-section and a mounting groove with a trapezoidal cross-section. The first permanent magnet is fixedly connected in the mounting groove, and the long side of the first permanent magnet is equal to the short side of the mounting groove. After the first permanent magnet is installed in the mounting groove, the two ends of the first permanent magnet form a first magnetic isolation groove. The magnetic isolation bridge is located on the radial side of the first magnetic isolation groove near the stator core. Through this improvement, the design of the mounting groove satisfies the fixed installation of the first permanent magnet, while the design of the first magnetic isolation groove enhances the magnetic isolation effect of the magnetic isolation bridge, reduces inter-pole leakage magnetic flux, increases the magnetic flux amplitude of the magnetic field, and improves the motor performance.

[0009] As an improvement of this utility model, the magnetic mechanism includes two second permanent magnets with rectangular cross-sections and a V-shaped groove with a V-shaped cross-section. The opening direction of the V-shaped groove is arranged radially away from the axis. The two second permanent magnets are respectively fixedly connected to the two sides of the V-shaped groove. Through this improvement, the torque / power density can also be increased by utilizing magnetic reluctance torque to meet the requirements of achieving high-speed performance through magnetic weakening, thereby achieving the purpose of high-performance drive. At the same time, by modifying the thickness of the two second permanent magnets and the opening angle of the V-shaped groove, the air gap can be changed to be more sinusoidal, thereby changing the output torque and torque pulsation of the rotating output shaft.

[0010] As an improvement of this utility model, the end of the V-shaped groove is provided with a second magnetic isolation groove. Through this improvement, the design of the second magnetic isolation groove can reduce inter-pole magnetic leakage, increase the magnetic flux amplitude of the magnetic field, and improve the motor performance.

[0011] As an improvement of this utility model, the rotor core is formed by stacking multiple rotor laminations. Through this improvement, the rotor core is formed by stacking multiple rotor laminations, which can increase the resistance of the rotor core and reduce the eddy currents in the rotor core. It also makes it easier to form the magnetic bridge by stamping. If the rotor core adopts an integral design, the magnetic bridge is easy to deform or break when stamping the magnetic bridge structure.

[0012] As an improvement of this utility model, the end of the rotating output shaft away from the eccentric cam is rotatably connected to the inside of the housing through a fixed bearing. This improvement ensures the rotatable connection between the rotating output shaft and the housing.

[0013] As an improvement of this utility model, a plastic end cap is fixedly connected to the opening end of the housing. The stator core and rotor core are both fixed inside the housing by the plastic end cap. A directional bearing is provided on the side of the plastic end cap away from the stator core. The directional bearing is used to rotatably connect the plastic end cap to the other end of the rotating output shaft. Through this improvement, the design of the plastic end cap achieves the sealing of the inside of the housing, thereby protecting and dustproofing the stator core and rotor core. The design of the directional bearing ensures the rotatable connection at both ends of the rotating output shaft, thereby ensuring the rotational stability of the rotating output shaft.

[0014] As an improvement of this utility model, a three-phase connector is provided on the side of the plastic end cap away from the stator core. The sockets of the three-phase connector are arranged in a triangular pattern, and the sockets are in a straight line or a square shape. Through this improvement, the design of the three-phase connector facilitates the electrical connection with the copper wire winding, thereby realizing the current control of the copper wire winding. At the same time, it can reduce the assembly difficulty of the product. The electrical connection between the brushless motor and the power supply can be realized through automatic plugging, which is conducive to realizing automated production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a top view of the internal structure of the casing in Embodiment 1 of this utility model.

[0017] Figure 3 This is an enlarged schematic diagram of the magnetic bridge structure in Embodiment 1 of this utility model.

[0018] Figure 4 This is a cross-sectional structural diagram of Embodiment 1 of the present invention.

[0019] Figure 5 This is a schematic diagram of a magnetic field line distribution structure formed by copper wire winding in Embodiment 1 of this utility model.

[0020] Figure 6 This is a schematic diagram of another magnetic field line distribution structure formed by the copper wire winding in Embodiment 1 of this utility model.

[0021] Figure 7 This is a top view of the internal structure of the casing in Embodiment 2 of this utility model.

[0022] Figure 8This is a schematic diagram of a magnetic field line distribution structure formed by copper wire winding in Embodiment 2 of this utility model.

[0023] Figure 9 This is a schematic diagram of another magnetic field line distribution structure formed by the copper wire winding in Embodiment 2 of this utility model.

[0024] The diagram shows: 1. Housing; 1.1. Bearing slot; 2. Stator core; 2.1. Copper wire winding; 3. Rotor core; 3.1. Magnetic mechanism; 3.1.1. First permanent magnet; 3.1.2. Mounting slot; 3.1.3. First magnetic isolation slot; 3.1.4. Second permanent magnet; 3.1.5. V-groove; 3.1.6. Second magnetic isolation slot; 3.1.7. Rotor lamination; 3.2. Concave surface; 3.3. Magnetic isolation bridge; 4. Rotating output shaft; 5. Eccentric cam; 6. Fixed bearing; 7. Plastic end cap; 7.1. Three-phase connector; 8. Directional bearing. Detailed Implementation

[0025] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0026] Example 1:

[0027] like Figures 1-2 As shown, a radial flux brushless motor includes a housing 1. A stator core 2 is fixedly connected to the inner wall of the housing 1 in the circumferential direction. Multiple copper wire windings 2.1 are uniformly arranged in the radial direction of the stator core 2, and the multiple copper wire windings 2.1 form a corresponding radial magnetic field. A rotor core 3 is rotatably connected to the center of the housing 1. Multiple magnetic mechanisms 3.1 are uniformly arranged in the circumferential direction of the rotor core 3 near the stator core 2. The magnetic fields of the multiple magnetic mechanisms 3.1 are distributed radially. The number of copper wire windings 2.1 is different from the number of magnetic mechanisms 3.1. A rotating output shaft 4 is fixedly connected to the axis of the rotor core 3, and an eccentric cam 5 for driving is fixedly connected to the output end of the rotating output shaft 4.

[0028] like Figures 2-3As shown, the outer edge of the rotor core 3 has several smooth concave surfaces 3.2, the number of which is the same as the number of magnetic mechanisms 3.1. Each magnetic mechanism 3.1 has a magnetic isolation bridge 3.3 at its end, located on the side of the magnetic mechanism 3.1 near the stator core 2. Each magnetic mechanism 3.1 includes a first permanent magnet 3.1.1 with a rectangular cross-section and a mounting groove 3.1.2 with a trapezoidal cross-section. The first permanent magnet 3.1.1 is fixedly connected in the mounting groove 3.1.2. The long side of the first permanent magnet 3.1.1 is equal to the short side of the mounting groove 3.1.2. After the first permanent magnet 3.1.1 is installed in the mounting groove 3.1.2, the two ends of the first permanent magnet 3.1.1 form the first magnetic isolation groove 3.1.3. The magnetic isolation bridge 3.3 is located on the radial side of the first magnetic isolation groove 3.1.3 near the stator core 2. The concave surface 3.2 is used to form the outer edge of the magnetic isolation bridge 3.3.

[0029] like Figure 4 As shown, the rotor core 3 is formed by stacking multiple rotor laminations 3.1.7. The end of the rotating output shaft 4 away from the eccentric cam 5 is rotatably connected to the inside of the housing 1 through a fixed bearing 6. A bearing groove 1.1 for installing the fixed bearing 6 is provided at the bottom of the housing 1. A plastic end cap 7 is fixedly connected to the opening end of the housing 1. The stator core 2 and the rotor core 3 are both fixed inside the housing 1 through the plastic end cap 7. A directional bearing 8 is provided on the side of the plastic end cap 7 away from the stator core 2. The directional bearing 8 is used to rotatably connect the plastic end cap 7 to the other end of the rotating output shaft 4.

[0030] like Figure 1 , Figure 4 As shown, the plastic end cap 7 is also provided with a three-phase connector 7.1 on the side away from the stator core 2. The connection parts of the three-phase connector 7.1 are distributed in a triangular shape. The connection parts are plugs or sockets. The plugs are in the shape of a straight line or a cylinder. The sockets are in the shape of a straight line, a round opening, or a square opening. The shape of the plug and the shape of the socket can be designed according to the connection requirements.

[0031] Example 2:

[0032] like Figure 7 As shown, the magnetic mechanism 3.1 includes two rectangular second permanent magnets 3.1.4 and a V-shaped groove 3.1.5. The opening direction of the V-shaped groove 3.1.5 is arranged radially away from the axis. The two second permanent magnets 3.1.4 are respectively fixedly connected to the two sides of the V-shaped groove 3.1.5. The end of the V-shaped groove 3.1.5 is provided with a second magnetic isolation groove 3.1.6. The two second permanent magnets 3.1.4 combine to form a radial magnetic field.

[0033] likeFigure 5 , Figure 6 , Figure 8 , Figure 9 As shown, the radial flux brushless motor design, compared to brushed motors, eliminates friction during stable driving, minimizing energy loss and resulting in superior driving performance. It also exhibits better performance in terms of noise, vibration, and acoustic roughness, leading to a better user experience and a longer lifespan. The difference in quantity between the copper wire windings 2.1 and the magnetic mechanism 3.1, along with the magnetic transformation of the copper wire windings 2.1, attracts and transforms the magnetic mechanism 3.1, causing the rotor core 3 to experience a relatively smooth circumferential force with minimal fluctuations. This contributes to the rotational stability of the rotor core 3. In high-speed applications, reluctance torque can be used to increase torque / power density, meeting the requirements for high-speed performance through field weakening, thus achieving high-performance driving. Furthermore, the concave surface 3.2 creates a non-uniform air gap between the rotor core 3 and the stator core 2, allowing the magnetic field of the rotor core 3 to exhibit sinusoidal influence, reducing the output torque and torque pulsation of the output shaft 4 and improving the driving performance of the brushless motor.

[0034] The above description only illustrates the preferred embodiment of this utility model and should not be construed as limiting the scope of the claims. This utility model is not limited to the above embodiments, and variations in its specific structure are permitted. All changes made within the scope of the independent claims of this utility model are also within the scope of protection of this utility model.

Claims

1. A radial flux brushless motor, characterized in that: The device includes a housing (1), a stator core (2) is fixedly connected to the inner wall of the housing (1) in the circumferential direction, and a plurality of copper wire windings (2.1) are uniformly arranged in the radial direction of the stator core (2). The plurality of copper wire windings (2.1) form a corresponding radial magnetic field. A rotor core (3) is rotatably connected to the center of the housing (1). A plurality of magnetic mechanisms (3.1) are uniformly arranged in the circumferential direction of the rotor core (3) near the stator core (2). The magnetic field of the plurality of magnetic mechanisms (3.1) is distributed radially. The number of copper wire windings (2.1) is different from the number of magnetic mechanisms (3.1). A rotating output shaft (4) is fixedly connected to the axis of the rotor core (3). An eccentric cam (5) for driving is fixedly connected to the output end of the rotating output shaft (4).

2. The radial flux brushless motor according to claim 1, characterized in that: The outer edge of the rotor core (3) is provided with a number of smooth concave surfaces (3.2), and the number of the concave surfaces (3.2) is the same as the number of the magnetic mechanism (3.1).

3. The radial flux brushless motor according to claim 1, characterized in that: Each of the magnetic mechanisms (3.1) is provided with a magnetic isolation bridge (3.3) at its end, and the magnetic isolation bridge (3.3) is located on the side of the magnetic mechanism (3.1) close to the stator core (2).

4. The radial flux brushless motor according to claim 3, characterized in that: The magnetic mechanism (3.1) includes a first permanent magnet (3.1.1) with a rectangular cross-section and a mounting groove (3.1.2) with a trapezoidal cross-section. The first permanent magnet (3.1.1) is fixedly connected in the mounting groove (3.1.2). The long side of the first permanent magnet (3.1.1) is equal to the short side of the mounting groove (3.1.2). After the first permanent magnet (3.1.1) is installed in the mounting groove (3.1.2), the two ends of the first permanent magnet (3.1.1) form a first magnetic isolation groove. 3.1.3), the magnetic isolation bridge (3.3) is located on the radial side of the first magnetic isolation groove (3.1.3) near the stator core (2).

5. A radial flux brushless motor according to claim 3, characterized in that: The magnetic mechanism (3.1) includes two rectangular second permanent magnets (3.1.4) and a V-shaped groove (3.1.5) with a V-shaped cross-section. The opening direction of the V-shaped groove (3.1.5) is arranged radially away from the axis. The two second permanent magnets (3.1.4) are respectively fixedly connected to the two sides of the V-shaped groove (3.1.5).

6. The radial flux brushless motor according to claim 5, characterized in that: The end of the V-groove (3.1.5) is provided with a second magnetic shielding groove (3.1.6).

7. A radial flux brushless motor according to claim 3, characterized in that: The rotor core (3) is formed by stacking multiple rotor laminations (3.1.7).

8. The radial flux brushless motor according to claim 1, characterized in that: The end of the rotating output shaft (4) away from the eccentric cam (5) is rotatably connected to the inside of the housing (1) via a fixed bearing (6).

9. A radial flux brushless motor according to claim 8, characterized in that: A plastic end cap (7) is fixedly connected to the shell opening end of the housing (1). The stator core (2) and the rotor core (3) are both fixed inside the housing (1) by the plastic end cap (7). A directional bearing (8) is provided on the side of the plastic end cap (7) away from the stator core (2). The directional bearing (8) is used to rotatably connect the plastic end cap (7) and the other end of the rotating output shaft (4).

10. A radial flux brushless motor according to claim 9, characterized in that: The plastic end cap (7) is provided with a three-phase connector (7.1) on the side away from the stator core (2). The connection part of the three-phase connector (7.1) is distributed in a triangular shape, and the connection part is in a straight line or a square shape.

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