Brushless toothless motor

Abstract

The utility model discloses a brushless toothless motor capable of eliminating resonance phenomenon, which comprises a main shaft, a stator and a rotor, the stator is composed of an iron core, a winding and a base, the base is fixed on the main shaft, one side of the stator is provided with a substrate, the other side of the stator is provided with an end cover, the outer edge of the substrate is fixedly connected with the end cover, and the rotor is fixed on the main shaft. A cavity is formed among the end cover, the base plate and the main shaft, the stator is located in the cavity, a hub is arranged on the end face, located outside the cavity, of the base plate, a plurality of through holes are formed in the machine base in the circumferential direction of the main shaft, first shaft sleeves made of flexible materials are arranged in the through holes, and second shaft sleeves made of hard materials are arranged in the first shaft sleeves. The motor vibration reduction structure has the advantages that the first shaft sleeve is arranged on the base to separate vibration transmission paths, mutual transmission of vibration among the stator, the main shaft and the hub is avoided, and the effect of vibration reduction of the whole motor is achieved.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, and in particular to a brushless gearless motor. Background Technology

[0002] Most electric bicycle motors currently on the market are brushless geared motors. These motors suffer from issues such as gear wear, high maintenance costs, and high noise levels. Brushless gearless motors, however, perfectly solve these problems. However, most brushless gearless motors on the market exhibit resonance, where the high-speed rotation of the wheel hub causes stator resonance. Since the stator is fixed to the rear wheel's main shaft, this causes vibration throughout the frame, generating noise. This leads to riding discomfort and reduces the perceived quality of the electric drivetrain. Utility Model Content

[0003] This invention proposes a brushless gearless motor that can eliminate resonance, thus solving the existing problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a brushless gearless motor, comprising a main shaft, a stator, and a rotor. The stator consists of an iron core, windings, and a base. The base is fixed on the main shaft. A base plate is provided on one side of the stator and is rotatably mounted on the main shaft. An end cover is provided on the other side of the stator and is rotatably mounted on the main shaft. The outer edge of the base plate extends to the other side of the stator and is fixedly connected to the end cover. A cavity is formed between the end cover, the base plate, and the main shaft. The stator is located within the cavity. The rotor is fixed on the base plate and cooperates with the stator. A hub is provided on the end face of the base plate outside the cavity. Several through holes are provided on the base along the circumferential direction of the main shaft. A first bushing made of flexible material is provided in the through holes. A second bushing made of rigid material is provided in the first bushing. The first bushing and the second bushing are fixed to the base by bolts and nuts.

[0005] The first bushing is provided with multiple vent holes.

[0006] One end of the first bushing is provided with a first stop edge that abuts against one side end face of the machine base. The other end of the first bushing is turned outward to form a second stop edge that abuts against the other side end face of the machine base. The second stop edge is located between the machine base and the nut.

[0007] The main shaft is provided with a step, and the machine base is fixed to the step by screws. The threaded end of the bolt passes through the step and the machine base and is threadedly connected to the nut.

[0008] One end of the first bushing is provided with a first stop edge that abuts against one side end face of the step. The other end of the first bushing passes through the step and the machine base and then turns outward to form a second stop edge that abuts against one side end face of the machine base. The second stop edge is located between the machine base and the nut.

[0009] The beneficial effects of this utility model are as follows: by setting a first bushing on the base to separate the vibration transmission path, the vibration between the stator, main shaft and hub is prevented from being transmitted to each other, thereby achieving the effect of vibration reduction of the entire motor. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure 2 for Figure 1 Middle stator installation structure diagram.

[0012] Figure 3 for Figure 1 Enlarged view of a portion of the image.

[0013] Labels in the diagram: 1. Main shaft; 2. Stator; 3. Rotor; 4. Iron core; 5. Winding; 6. Frame; 7. Base plate; 8. First bearing; 9. End cover; 10. Second bearing; 11. Extension section; 12. Cavity; 13. Hub; 14. First bushing; 15. Second bushing; 16. Bolt; 17. Nut; 18. First flange; 19. Second flange; 20. Tile magnet; 21. Hall plate; 22. Step; 23. Screw. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] like Figures 1-3 As shown, a brushless gearless motor includes a main shaft 1, a stator 2, and a rotor 3. The stator 2 has a conventional structure, as shown in the figure. Figure 2 As shown, the stator 2 consists of an iron core 4, windings 5, and a base 6. The base 6 is fixed to the main shaft 1. In actual production, a step 22 is provided on the main shaft 1, and the base 6 is fixed to the step 23 by screws 23. A base plate 7 is provided on one side of the stator 2. The base plate 7 is rotatably mounted on the main shaft 1 via a first bearing 8. An end cover 9 is provided on the other side of the stator 2. The end cover 9 is rotatably mounted on the main shaft 1 via a second bearing 10. The outer edge of the base plate 7 extends to the other side of the stator 2 and is fixedly connected to the end cover 9. The extended outer edge is an extension section 11, which is fixedly connected to the end cover 9. A cavity 12 is formed between the end cover 9, the base plate 7, and the main shaft 1. The stator 2 is located inside the cavity 12. The rotor 3 is fixed on the extension section 11 and cooperates with the stator 2. A hub 13 is provided on the end face of the base plate 7 located outside the cavity 12. Several through holes are provided on the base 6 along the circumferential direction of the main shaft. Figure 3As shown, a first bushing 14 made of flexible material is installed inside the through hole, and a second bushing 15 made of rigid material is installed inside the first bushing 14. The first bushing 14 and the second bushing 15 are fixed to the machine base 6 by bolts 16 and nuts 17. The second bushing 15, made of rigid material (such as iron), is installed inside the first bushing 14. In actual production, a plastic coating can be used on the iron bushing to prevent radial movement of the bolt. In actual production, the threaded end of the bolt 16 can also pass through the step 22 and the machine base 6 and then be threadedly connected to the nut 17. This can eliminate resonance, reduce noise, and also fix the stator 2.

[0016] The first bushing 14 has multiple vent holes. This has the advantage of shielding low-frequency noise. Furthermore, the low-frequency sound-absorbing first bushing 14 operates using resonance, and the porous structure can act as a dissipative medium.

[0017] like Figure 3 As shown, one end of the first bushing 14 is provided with a first retaining edge 18 that abuts against one side end face of the base 6. The other end of the first bushing 14 is turned outward to form a second retaining edge 19 that abuts against the other side end face of the base 6. The second retaining edge 19 is located between the base 6 and the nut 17. That is, the nut 17 presses the second retaining edge 19 onto the base 6, thereby fixing the first bushing 14 and effectively pressing the iron core 4. The iron core 4 is composed of multiple layers of iron chips, and at the same time, it prevents misalignment between adjacent iron chips due to vibration, which would affect the magnetic field effect. If, in actual production, the threaded end of the bolt 16 passes through the step 22 and the base 6 and is threadedly connected to the nut 17, then one end of the first bushing 14 is provided with a first retaining edge 18 that abuts against one side end face of the step 22, and the other end of the first bushing 14 passes through the step 22 and the base 6 and is turned outward to form a second retaining edge 19 that abuts against one side end face of the base 6. The second retaining edge 19 is located between the base 6 and the nut 17.

[0018] The rotor 3 is equipped with a ring of tile-shaped magnets 20 to provide the necessary magnetic field for the motor. A Hall plate 21 with a Hall sensor is mounted on the base 6. An inductive magnet that cooperates with the Hall sensor is mounted on the base plate 7. The combination of the inductive magnet and the Hall sensor allows data such as rotational speed and distance to be transmitted to the main control system of the electric bicycle for analysis.

[0019] Working Principle: The electromagnetic field of a brushless gearless motor can generate low-frequency noise, which typically has high penetrating power. Furthermore, the vibration generated during the high-speed rotation of the hub 13 can cause resonance in the stator 2, leading to noise and vibration from the stator 2 that can cause riding discomfort and reduce the perceived quality of the electric power transmission system. A first bushing 14 is installed on the base 6 to separate the vibration transmission path caused by the hub 13, preventing the vibration from being transmitted between the stator 2, main shaft 1, and hub 13. This eliminates resonance and achieves overall motor vibration reduction. The first bushing 14 has sound-absorbing properties. Through-holes in the base 6 disrupt the structural vibration path, attenuating the transmission of structural vibration through the stator. Simultaneously, the structure maintains a complete electromagnetic flux path through the stator. This configuration allows the sound transmission properties of the stator 2 (from the core 4 to the center of the base 6) to be tunable, and local resonances can be affected by adjusting the geometry (e.g., shape) of the through-holes.

Claims

1. A brushless gearless motor, comprising a main shaft, a stator, and a rotor, wherein the stator is composed of an iron core, windings, and a frame, the frame being fixed on the main shaft, a base plate being disposed on one side of the stator and rotatably mounted on the main shaft, and an end cover being disposed on the other side of the stator and rotatably mounted on the main shaft, the outer edge of the base plate extending to the other side of the stator and being fixedly connected to the end cover, a cavity being formed between the end cover, the base plate, and the main shaft, the stator being located within the cavity, the rotor being fixed on the base plate and cooperating with the stator, and a hub being disposed on the end face of the base plate located outside the cavity, characterized in that: The machine base has several through holes along the circumference of the main shaft. A first bushing made of flexible material is installed in the through holes, and a second bushing made of rigid material is installed in the first bushing. The first bushing and the second bushing are fixed to the machine base by bolts and nuts.

2. The brushless gearless motor according to claim 1, characterized in that: The first bushing is provided with multiple vent holes.

3. A brushless gearless motor according to claim 1, characterized in that: One end of the first bushing is provided with a first stop edge that abuts against one side end face of the machine base. The other end of the first bushing is turned outward to form a second stop edge that abuts against the other side end face of the machine base. The second stop edge is located between the machine base and the nut.

4. A brushless gearless motor according to claim 1, characterized in that: The spindle is provided with a step, and the machine base is fixed to the step by screws. The threaded end of the bolt passes through the step and the machine base and is threadedly connected to the nut.

5. A brushless gearless motor according to claim 4, characterized in that: One end of the first bushing is provided with a first stop edge that abuts against one side end face of the step. The other end of the first bushing passes through the step and the machine base and then turns outward to form a second stop edge that abuts against one side end face of the machine base. The second stop edge is located between the machine base and the nut.

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