Permanent magnet brushless direct current motor

Abstract

The utility model relates to the technical field of brushless direct current motors, and discloses a permanent magnet brushless direct current motor which comprises an inner rotor assembly, a limiting block and a protective cover, the inner rotor assembly comprises an inner rotor rack, a rotor iron core and a rotor winding, and the inner rotor rack is provided with a limiting slot matched with the rotor iron core for plugging and positioning. A limiting ring is arranged on the inner rotor rack, the limiting block comprises an inner ring, an outer ring, a connecting strip and a limiting plate, the limiting plate sleeves the outer side of the limiting ring in a limiting manner, the protective cover sleeves the outer side surface of the commutator, two arc-shaped parts aligned to the two stator magnets are arranged on the protective cover, and the two stator magnets are pressed and positioned in the front shell through the arc-shaped parts. The arrangement of the limiting slot and the limiting ring can ensure the accurate positioning of the rotor core and prevent the position deviation in the operation process, thereby improving the overall stability of the motor, preventing the damage caused by vibration, collision and the like, and reducing the vibration and noise.

Description

Technical Field

[0001] The utility model belongs to the technical field of brushless DC motors, and in particular relates to a permanent magnet brushless DC motor. Background Art

[0002] Brushed permanent magnet DC motors are widely used due to their high efficiency and high output power per unit volume. However, a major disadvantage of brushed motors is that they require brushes and commutators. The brushes of permanent magnet DC drive motors can be replaced twice during the life of the motor. The brushes actually limit the life of the motor. The mechanical friction between the brushes and the commutator brings about sparks, noise, radio interference and other weaknesses, which greatly limit its further development and application scope.

[0003] With the development of high-performance permanent magnet materials, microelectronics technology, automatic control technology and power electronics technology, permanent magnet brushless DC motors have developed rapidly. Due to overcoming the inherent shortcomings of mechanical commutation devices, brushless DC motors have many advantages such as long life, strong speed regulation performance, small size, light weight, high efficiency, small moment of inertia, and good electromagnetic compatibility. In traditional permanent magnet brushless DC motors, the rotor core is usually composed of multiple stacked iron sheets without precise limit positioning structure to ensure accurate positioning. This stacking structure easily causes instability and deviation of the rotor core, which in turn leads to increased vibration and noise, and may reduce the life of the motor. Utility Model Content

[0004] In order to make up for the deficiencies of the prior art, the utility model provides a permanent magnet brushless DC motor.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A permanent magnet brushless DC motor comprises an inner rotor assembly, a stop block and a protective cover, wherein the inner rotor assembly comprises an inner rotor frame, a plurality of rotor cores sleeved on the inner rotor frame, and a rotor winding wound on the rotor cores, wherein a plurality of stop slots for inserting and positioning the rotor cores are arranged in an annular manner at equal distances on the inner rotor frame, and a stop ring is provided on the inner rotor frame;

[0007] The limit block comprises an inner ring, an outer ring, a connecting strip connecting the inner ring and the outer ring, and a plurality of limit plates arranged in an annular shape and at equal distances on the inner side of the outer ring, and the limit plates are limitedly sleeved on the outer side of the limit ring;

[0008] The protective cover is sleeved on the outer side of the commutator, and is provided with two arc-shaped parts aligned with the two stator magnets, through which the two stator magnets are pressed and positioned in the front housing.

[0009] Preferably, an inwardly inclined closing portion is provided on the outer side of the limiting slot, so that the rotor core is more firmly positioned when inserted into the limiting slot, reducing the possibility of vibration and displacement during operation.

[0010] Preferably, each of the limiting slots is provided with a mounting hole, and the inner rotor frame is fixed to the rotating shaft by means of hidden screws passing through the mounting holes, so that the inner rotor frame can be conveniently installed, positioned and fixed on the rotating shaft.

[0011] Preferably, a plurality of open slots are provided on the arc-shaped portion, so as to save the material cost of the protective cover and facilitate heat dissipation and ventilation.

[0012] Preferably, the permanent magnet brushless DC motor further comprises a rear cover plate, on which holes are arranged symmetrically and equidistantly in a ring shape, and the rear cover plate, the protective cover and the limit block are fixed together by screws penetrating the holes, and the protective cover and the limit block are installed in an installation chamber surrounded by the front housing and the rear cover plate;

[0013] The protective cover and the limiting block are sleeved on the outer side of the rotating shaft.

[0014] By fixing the rear cover, protective cover and limit block together, the structural stability of the motor can be enhanced and the vibration and displacement during operation can be reduced. The rear cover, protective cover and limit block can be easily removed and installed through the screws through the holes, simplifying the maintenance and repair process.

[0015] Preferably, bearings are provided at both ends of the rotating shaft, and the two bearings at both ends are respectively clamped on the outer shell and the rear cover plate.

[0016] Preferably, the outer edge of the rear cover is threadedly connected to the outer shell by bolts, so that the rear cover is conveniently connected to the outer shell to form a protective shell of the entire motor.

[0017] Preferably, the rear cover plate is buckled with a mounting cover, and the two electrode pins on the commutator pass through the mounting cover and the openings on the rear cover plate, and the two electrode pins are electrically connected to the electrical port on the mounting cover.

[0018] The circuit connection process can be simplified by arranging openings on the rear cover plate and directly passing the electrode pins of the commutator through the power connection ports on the mounting cover.

[0019] Compared with the prior art, the technical effects and advantages of the utility model are:

[0020] The setting of the limit slot and the limit ring in the permanent magnet brushless DC motor can ensure the accurate positioning of the rotor core and prevent position deviation during operation, thereby improving the overall stability of the motor. The design of the limit block, especially the limit plate limit sleeve on the outside of the limit ring, can effectively limit the displacement range of the rotor core during rotation to avoid collision and damage. The design of the limit slot, the limit ring, the limit block and the protective cover can ensure that the motor remains stable during operation, prevent damage due to vibration, collision and the like, reduce vibration and noise, thereby improving the overall safety and reliability of the motor.

[0021] The inner rotor assembly generates heat during operation. To ensure the stability and life of the motor, effective heat dissipation is required. The holes on the protective cover and the stopper block help to directly transfer the heat generated by the inner rotor assembly to the external environment, thereby improving the heat dissipation performance of the motor. Noise and vibration may be generated during the operation of the motor, which will affect the performance and life of the motor. By optimizing the design of the inner rotor assembly, the stopper block and the protective cover, the noise and vibration during operation can be reduced and the overall performance of the motor can be improved.

[0022] By setting symmetrical holes and screws on the rear cover, protective cover and limit block, these components can be easily disassembled, thus simplifying the maintenance and repair process of the motor. The overall motor design takes into account aesthetics and workmanship, making the appearance of the motor more neat and compact, without messy external connecting wires. This helps to improve the overall quality of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the inner rotor frame of the utility model;

[0024] Figure 2 This is an exploded view of the inner rotor frame of the utility model;

[0025] Figure 3 It is a schematic diagram of the structure of the utility model;

[0026] Figure 4 This is the first exploded view of the utility model;

[0027] Figure 5 This is the second exploded view of the utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the protective cover of the utility model against the stator magnet;

[0029] Figure 7 This is a schematic diagram of the structure of the limit block of the utility model;

[0030] Figure 8 This is a schematic diagram of the structure of the protective cover of the utility model;

[0031] Fig. 9 It is a structural schematic diagram of the rear cover plate of the utility model.

[0032] In the figure: 1. inner rotor frame; 2. rotor core; 3. rotor winding; 4. limiting slot; 5. limiting ring; 6. closing part; 7. mounting hole; 8. rotating shaft; 9. limiting block; 901. inner ring; 902. outer ring; 903. connecting strip; 904. limiting plate; 10. protective cover; 11. commutator; 12. arc-shaped part; 13. stator magnet; 14. front shell; 15. opening slot; 16. rear cover; 17. hole position; 18. bearing; 19. mounting cover; 20. electrode pin; 21. opening; 22. electrical connection port. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] The following is combined with Figure 1-9 To further explain this application in detail,

[0035] The embodiment of the present application discloses a permanent magnet brushless DC motor, including an inner rotor assembly, a stopper 9 and a protective cover 10, wherein the inner rotor assembly includes an inner rotor frame 1, a plurality of rotor cores 2 sleeved on the inner rotor frame 1, and a rotor winding 3 wound on the rotor core 2, wherein the inner rotor frame 1 is provided with a plurality of stopper slots 4 arranged in an annular manner and spaced equidistantly to cooperate with the rotor core 2 for insertion and positioning, and a stopper ring 5 is provided on the inner rotor frame 1;

[0036] The limiting block 9 includes an inner ring 901, an outer ring 902, a connecting strip 903 connecting the inner ring 901 and the outer ring 902, and a plurality of limiting plates 904 arranged in an annular shape and at equal distances on the inner side of the outer ring 902, and the limiting plates 904 are limitedly sleeved on the outer side of the limiting ring 5;

[0037] The protective cover 10 is sleeved on the outer side of the commutator 11 , and is provided with two arc-shaped portions 12 aligned with the two stator magnets 13 . The two stator magnets 13 are pressed and positioned in the front housing 14 through the arc-shaped portions 12 .

[0038] The setting of the limit slot 4 and the limit ring 5 can ensure the accurate positioning of the rotor core 2 and prevent position deviation during operation, thereby improving the overall stability of the motor and reducing vibration and noise. The design of the limit block 9, especially the limit plate 904 limiting sleeve on the outside of the limit ring 5, can effectively limit the displacement range of the rotor core 2 during rotation to avoid collision and damage. A gap is left between the limit plates 904 on the limit block 9, and heat dissipation holes are formed between the inner ring 901, the outer ring 902 and the connecting strip 903, which can effectively transfer the heat generated by the inner rotor assembly during operation directly to the outside, thereby improving the heat dissipation performance of the motor and extending the service life of the motor. The setting of the protective cover 10 can protect the commutator 11 from the external environment. The arc portion 12 design on the protective cover 10 can ensure the compression and positioning of the stator magnet 13, further improving the safety of the motor.

[0039] The outer side of the limiting slot 4 is provided with an inwardly inclined closing portion 6, so that the rotor core is more firmly positioned when inserted into the limiting slot 4, reducing the possibility of vibration and displacement during operation. The inclined closing portion 6 helps the rotor core 2 to slide into the limiting slot 4 more easily, improving the assembly efficiency and reducing potential errors in the assembly process. When the rotor core 2 is inserted into the limiting slot 4, the closing portion 6 can effectively clamp the core to prevent loosening due to vibration and other reasons during the operation of the motor. After the rotor core 2 is inserted and positioned, it is fixed to the inner rotor frame 1 by screws;

[0040] The design of the closing portion 6 can protect the end of the rotor core 2 and prevent it from being damaged during the insertion or removal process. The inclined closing portion 6 can enhance the structural strength of the limiting slot 4, improve the overall mechanical properties, and extend the service life of the motor.

[0041] Each of the limiting slots 4 is provided with a mounting hole 7 , and the inner rotor frame 1 is fixed to the rotating shaft 8 by means of hidden screws penetrating the mounting holes 7 , so that the inner rotor frame 1 is conveniently installed, positioned and fixed on the rotating shaft 8 .

[0042] The arc portion 12 is provided with a plurality of opening slots 15 , which can save the material cost of the protective cover 10 and facilitate heat dissipation and ventilation.

[0043] The permanent magnet brushless DC motor also includes a rear cover plate 16, on which holes 17 are arranged symmetrically and equidistantly in a ring shape, and the rear cover plate 16, the protective cover 10 and the limit block 9 are fixed together by screws penetrating the holes 17, and the protective cover 10 and the limit block 9 are installed in an installation chamber surrounded by the front housing 14 and the rear cover plate 16;

[0044] The protective cover 10 and the limiting block 9 are sleeved on the outer side of the rotating shaft 8 .

[0045] By fixing the rear cover 16, the protective cover 10 and the limit block 9 together, the structural stability of the motor can be enhanced and the vibration and displacement during operation can be reduced. The rear cover 16, the protective cover 10 and the limit block 9 can be easily removed and installed through the screws through the hole 17, which simplifies the maintenance and repair process. The rear cover 16, the protective cover 10 and the limit block 9 are installed and fixed together, providing an additional layer of protection to prevent the external environment from damaging the internal components and extending the service life of the motor. This design can prevent the rear cover 16, the protective cover 10 and the limit block 9 from loosening due to misoperation or external force, thereby reducing potential safety hazards.

[0046] The two ends of the rotating shaft 8 are respectively provided with bearings 18 , and the two bearings 18 at the two ends are respectively clamped on the outer shell and the rear cover plate 16 .

[0047] The outer edge of the rear cover plate 16 is threadedly connected to the outer shell through bolts, so that the rear cover plate 16 is conveniently connected to the outer shell to form a protective shell of the entire motor.

[0048] The rear cover plate 16 is buckled with a mounting cover 19 , and two electrode pins 20 on the commutator 11 are arranged through openings 21 on the rear cover plate 16 , and the two electrode pins 20 are electrically connected to an electrical port 22 on the mounting cover 19 .

[0049] By setting an opening 21 on the rear cover 16 and directly passing the electrode pin 20 of the commutator 11 through the power port 22 on the mounting cover 19, the circuit connection process can be simplified and the number and complexity of external connection lines can be reduced. The presence of the mounting cover 19 provides an additional protective layer for the electrode pin 20, which can prevent external factors such as dust and moisture from damaging the electrode, thereby improving the protection performance of the motor.

[0050] The snap-fit ​​design of the rear cover 16 and the mounting cover 19, as well as the through-fixing of the electrode pins 20, enhance the structural stability of the motor and reduce loosening due to vibration or impact. The overall design takes aesthetics into consideration, making the appearance of the motor neater and free of messy external connecting wires.

[0051] The inner rotor assembly on the permanent magnet brushless DC motor includes an inner rotor frame 1, a rotor core 2 and a rotor winding 3. The rotor core 2 is inserted into the limiting slot 4 and connected to the external circuit through the rotor winding 3 so as to generate a magnetic field when powered on. The limiting block 9 includes an inner ring 901, an outer ring 902 and a limiting plate 904, which are used to ensure that the rotor core 2 maintains the correct position during the operation of the motor to prevent displacement and collision. The protective cover 10 is sleeved on the outer side of the commutator 11 and is provided with an arc portion 12 to compress and position the stator magnet 13 to ensure its correct position in the front housing 14. The design of the limiting slot 4 and the limiting ring 5 ensures the accurate positioning of the rotor core 2, reduces vibration and displacement during operation, and improves the stability of the motor.

[0052] The rear cover 16 is fixed together with the protective cover 10 and the stopper 9 by screws to form an installation chamber, which enhances the structural stability of the motor and facilitates maintenance and repair. A hole 17 is provided on the rear cover 16 to facilitate the connection between the installation cover 19 and the electrode pin 20. The electrode pin 20 on the commutator 11 passes through the opening 21 on the rear cover 16 and is electrically connected to the electrical port 22 on the installation cover 19, which simplifies the circuit connection and provides additional protection.

[0053] When the motor is powered on, the magnetic field generated by the rotor winding 3 interacts with the stator magnet 13 to generate torque, causing the rotor to start rotating. The rotor maintains the correct position under the action of the limit block 9 to prevent unnecessary vibration and collision, thereby improving the smoothness and life of the operation. The protective cover 10 ensures the correct position of the stator magnet 13 and protects the commutator 11 from the influence of the external environment. The fixation of the rear cover 16 and the mounting cover 19 provides an additional layer of protection to prevent external factors from damaging the internal components of the motor.

[0054] In general, this design of permanent magnet brushless DC motor improves the performance, reliability and maintenance-friendliness of the motor through precise component positioning, optimized structural design and comprehensive protection measures.

[0055] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A permanent magnet brushless DC motor, characterized in that: include: An inner rotor assembly, the inner rotor assembly comprising an inner rotor frame (1), a plurality of rotor cores (2) sleeved on the inner rotor frame (1), and a rotor winding (3) wound around the rotor cores (2); the inner rotor frame (1) is provided with a plurality of limit slots (4) arranged at equal intervals in an annular pattern for inserting and positioning the rotor cores (2); and the inner rotor frame (1) is provided with a limit ring (5); A limit block (9), the limit block (9) comprising an inner ring (901), an outer ring (902), a connecting strip (903) connecting the inner ring (901) and the outer ring (902), and a plurality of limit plates (904) arranged in an annular shape and at equal distances on the inner side of the outer ring (902), the limit plates (904) being limitedly sleeved on the outer side of the limit ring (5); A protective cover (10) is sleeved on the outer side of the commutator (11), and the protective cover (10) is provided with two arc-shaped portions (12) aligned with the two stator magnets (13), and the two stator magnets (13) are pressed and positioned in the front housing (14) through the arc-shaped portions (12).

2. A permanent magnet brushless DC motor according to claim 1, characterized in that: The outer side of the limiting slot (4) is provided with an inwardly inclined closing portion (6).

3. A permanent magnet brushless DC motor according to claim 1, characterized in that: Each of the limiting slots (4) is provided with a mounting hole (7), and the inner rotor frame (1) is fixed to the rotating shaft (8) by means of hidden screws penetrating the mounting holes (7).

4. A permanent magnet brushless DC motor according to claim 1, characterized in that: The arc-shaped portion (12) is provided with a plurality of opening grooves (15).

5. A permanent magnet brushless DC motor according to any one of claims 1 to 4, characterized in that: The invention also comprises a rear cover plate (16), wherein the rear cover plate (16), the protective cover (10) and the limit block (9) are provided with symmetrically arranged holes (17) arranged in a circular pattern and at equal distances, and the rear cover plate (16), the protective cover (10) and the limit block (9) are fixed together by screws penetrating the holes (17), and the protective cover (10) and the limit block (9) are installed in an installation chamber surrounded by the front housing (14) and the rear cover plate (16); The protective cover (10) and the limiting block (9) are sleeved on the outer side surface of the rotating shaft (8).

6. A permanent magnet brushless DC motor according to claim 5, characterized in that: Bearings (18) are respectively provided at both ends of the rotating shaft (8), and the two bearings (18) at the two ends are respectively clamped on the outer shell and the rear cover plate (16).

7. A permanent magnet brushless DC motor according to claim 5, characterized in that: The outer edge of the rear cover plate (16) is threadedly connected to the outer shell through bolts.

8. A permanent magnet brushless DC motor according to claim 5, characterized in that: The rear cover plate (16) is buckled with a mounting cover (19), and two electrode pins (20) on the commutator (11) pass through the mounting cover (19) and an opening (21) on the rear cover plate (16), and the two electrode pins (20) are electrically connected to an electrical port (22) on the mounting cover (19).

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