Stator core of brushless generator

Abstract

The utility model relates to the technical field of stator cores, and discloses a brushless generator stator core, which comprises a stator core body and tooth crowns arranged on the periphery of the stator core body. Axial grooves are formed in the tooth crowns, the axial grooves are parallel to the axis of the center of the stator core body, and the axial grooves are used for reducing magnetic resistance; a magnetic bridge assembly is installed in the axial groove, and the magnetic bridge assembly is used for reducing torque ripple and vibration caused by the cogging effect. According to the stator iron core of the brushless generator provided by the utility model, the axial grooves are arranged, the tooth crowns are provided with the axial grooves, and the axial grooves are parallel to the axis of the motor, so that the design is beneficial to changing a magnetic flux path and reducing magnetic resistance, thereby reducing torque fluctuation and vibration caused by a cogging effect; and the positioning precision and the servo performance of the motor are improved.

Description

Technical Field

[0001] This utility model relates to the field of stator core technology, and in particular to a stator core for a brushless generator. Background Technology

[0002] A brushless motor is a type of motor that does not use brushes for commutation. Compared to traditional brushed motors, it achieves commutation through electronic control, thereby eliminating the problem of brush wear. Brushless motors rely on changing the alternating frequency and waveform of the current wave input to the stator coils to form a magnetic field that rotates around the geometric axis of the motor. This magnetic field drives the permanent magnets on the rotor to rotate, and the motor starts to rotate. A brushless motor mainly consists of two parts: a stator and a rotor. The stator is the stationary part of the motor, containing the winding coils. A rotating magnetic field is generated in the coils by the current. The rotor is the rotating part of the motor, usually containing permanent magnets. When the motor is running, the windings in the stator core are excited by the current from the power supply, generating a magnetic field. This magnetic field interacts with the permanent magnets on the rotor, causing the rotor to rotate around the axis.

[0003] The main problem with existing stator cores is the large cogging torque, which leads to motor torque fluctuations and vibrations, affecting the motor's positioning accuracy and servo performance.

[0004] To address the aforementioned issues, this application proposes a brushless generator stator core. Utility Model Content

[0005] Based on the technical problems existing in the background art, this utility model proposes a brushless generator stator core.

[0006] The present invention proposes a brushless generator stator core, comprising a stator core body and a tooth crown installed on the outer periphery of the stator core body;

[0007] An axial groove is provided inside the tooth crown. The axial groove is parallel to the axis of the center of the stator core body, and the axial groove is used to reduce magnetic resistance.

[0008] A magnetic bridge assembly is installed in the axial groove, and the magnetic bridge assembly is used to reduce torque fluctuations and vibrations caused by the cogging effect.

[0009] Preferably, the magnetic bridge assembly includes multiple magnetic bridge segments and an assembly, and the multiple magnetic bridge segments are installed in the axial groove by the assembly.

[0010] Preferably, the multi-segment magnetic bridge component includes a fixing rod and a magnetic bridge body. The multi-segment magnetic bridge component is installed in an axial groove by means of an assembly, and the magnetic bridge body is installed on the fixing rod by means of an assembly.

[0011] Preferably, the assembly includes a screw and a nut, the screw is installed in the axial groove, the fixing rod and the magnetic bridge body are both sleeved on the screw, and the nut that is threaded onto the screw and pressed against the magnetic bridge body is screwed on the screw.

[0012] Preferably, the number of the multi-segment magnetic bridge components and the assembly components is multiple sets, which are distributed sequentially within the axial groove.

[0013] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0014] 1. By setting axial grooves, since the tooth crown has axial grooves that are parallel to the motor axis, this design helps to change the magnetic flux path and reduce magnetic resistance, thereby reducing torque fluctuations and vibrations caused by the cogging effect, and improving the positioning accuracy and servo performance of the motor.

[0015] 2. By using a magnetic bridge assembly installed within the axial groove, torque fluctuations and vibrations caused by cogging effect can be effectively reduced, as well as the impact of stator tooth and rotor pole width on output torque, thereby reducing cogging torque. Furthermore, by optimizing stator tooth width and rotor pole width, cogging torque can be significantly reduced, and average output torque is slightly reduced. In this way, the magnetic bridge assembly helps improve motor performance, reducing the impact of cogging torque at low speeds and improving motor stability and efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a brushless generator stator core proposed in this utility model.

[0017] Figure 2 This utility model Figure 1 A three-dimensional structural diagram of the stator core body and the tooth crown.

[0018] Figure 3 This utility model Figure 1 A schematic diagram of the structure of the central crown.

[0019] Figure 4 This utility model Figure 3 A schematic diagram of the three-dimensional structure.

[0020] Figure 5 This utility model Figure 4 A magnified view of A in the middle.

[0021] Reference numerals in the attached figures: 1. Stator core body; 2. Tooth crown; 3. Axial groove; 4. Magnetic bridge assembly; 41. Multi-segment magnetic bridge component; 411. Fixing rod; 412. Magnetic bridge body; 42. Assembly part; 421. Screw; 422. Nut. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0023] like Figure 1-5 As shown, the present invention proposes a brushless generator stator core, which includes a stator core body 1 and a tooth crown 2 installed on the outer periphery of the stator core body 1.

[0024] In this embodiment, an axial groove 3 is provided inside the tooth crown 2. The axial groove 3 is parallel to the axis of the center of the stator core body 1, and the axial groove 3 is used to reduce magnetic resistance.

[0025] It should be noted that the axial grooves 3 formed on the tooth crowns 2 of the stator core body 1 are used to reduce magnetic resistance by adjusting the magnetic flux path, thereby reducing torque fluctuations and vibrations caused by the cogging effect. Specifically, these axial grooves 3 are parallel to the motor axis, changing the original path of the magnetic lines of force passing directly through the stator teeth. This change in the magnetic flux path reduces the non-uniformity of magnetic flux when it alternates between the stator teeth and the rotor, thus reducing the change in air gap permeability. Since the torque fluctuations caused by the cogging effect are closely related to the change in air gap permeability, the axial grooves 3 help to reduce torque fluctuations by reducing this change. This reduction in torque fluctuations can reduce speed fluctuations during motor operation, reduce vibration and noise, and ultimately improve the positioning accuracy and servo performance of the motor. By optimizing the magnetic flux distribution, the axial grooves 3 reduce the instability during motor operation and improve the overall performance of the motor.

[0026] In this embodiment, a magnetic bridge assembly 4 is installed in the axial groove 3, and the magnetic bridge assembly 4 is used to reduce torque fluctuation and vibration caused by cogging effect. The magnetic bridge assembly 4 includes multiple magnetic bridge components 41 and an assembly 42. Multiple magnetic bridge components 41 are installed in the axial groove 3 through the assembly 42. The multiple magnetic bridge components 41 include a fixing rod 411 and a magnetic bridge body 412. The multiple magnetic bridge components 41 are installed in the axial groove 3 through the assembly 42. The magnetic bridge body 412 is installed on the fixing rod 411 through the assembly 42. The assembly 42 includes a screw 421 and a nut 422. The screw 421 is installed in the axial groove 3. The fixing rod 411 and the magnetic bridge body 412 are both sleeved on the screw 421. The screw 421 is threaded with a nut 422 that is pressed against the magnetic bridge body 412.

[0027] In a specific embodiment, the number of multiple magnetic bridge components 41 and assembly components 42 are multiple sets, which are distributed sequentially in the axial groove 3.

[0028] It should be noted that the magnetic bridge 412 is placed within the axial groove 3. Its core function is to adjust the magnetic flux distribution inside the motor, thereby reducing the influence of cogging torque. Cogging torque is generated by the interaction between the permanent magnet and the stator core. When the motor rotor rotates, the magnetic permeability changes significantly within a small range of the stator slots, causing changes in the stored magnetic field energy, thus generating cogging torque. This torque pulsation leads to speed fluctuations, vibration, and noise, with more severe effects at low speeds, significantly impacting the motor's positioning accuracy and servo performance. The magnetic bridge 412 reduces the magnetic flux in the stator by altering the magnetic flux path. The unevenness in the alternation between the stator and rotor teeth reduces the cogging torque. This design effectively reduces the impact of stator tooth and rotor pole width on the output torque, thus reducing the cogging torque and slightly lowering the average output torque, improving the stability and efficiency of the motor. At low speeds, the impact of cogging torque is significantly reduced, further enhancing the stability and efficiency of the motor. In addition, by optimizing the stator tooth width and rotor pole width, the cogging torque can be further reduced, optimizing the motor's performance. In this way, the magnetic bridge 412 not only improves the motor's performance but also enhances its performance and reliability under various operating conditions.

[0029] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A brushless generator stator core, comprising a stator core body (1) and a toothed crown (2) mounted on the outer periphery of the stator core body (1), characterized in that: an axial recess (3) is formed in the toothed crown (2), the axial recess (3) is parallel to the axis of the center of the stator core body (1), and the axial recess (3) is used to reduce the magnetic resistance; a magnetic bridge assembly (4) is mounted in the axial recess (3), and the magnetic bridge assembly (4) is used to reduce the torque fluctuation and vibration caused by the cogging effect. The magnetic bridge assembly (4) comprises a plurality of magnetic bridge pieces (41) and assembling pieces (42), and the plurality of magnetic bridge pieces (41) are mounted in the axial recess (3) through the assembling pieces (42).

2. A brushless generator stator core according to claim 1, characterised in that, The plurality of magnetic bridge pieces (41) comprise a fixed rod (411) and a magnetic bridge body (412), the plurality of magnetic bridge pieces (41) are mounted in the axial recess (3) through the assembling pieces (42), and the magnetic bridge body (412) is mounted on the fixed rod (411) through the assembling piece (42).

3. A brushless motor stator core according to claim 2, wherein The assembling piece (42) comprises a screw rod (421) and a nut (422), the screw rod (421) is mounted in the axial recess (3), the fixed rod (411) and the magnetic bridge body (412) are sleeved on the screw rod (421), and the nut (422) is threadedly sleeved on the screw rod (421) and is pressed against the magnetic bridge body (412).

4. A brushless motor stator core according to claim 3, wherein The plurality of magnetic bridge pieces (41) and the plurality of assembling pieces (42) are distributed in the axial recess (3) in sequence.

5. A brushless motor stator core according to claim 4, wherein ​

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