Permanent magnet motor rotor assembly, stator assembly and permanent magnet motor

Abstract

The utility model discloses permanent magnet motor rotor subassembly, stator subassembly and permanent magnet motor, including rotor, the rotor is close to the position of the axle core and is equipped with a plurality of axial straight through air hole, and the rotor is close to the periphery and is equipped with a plurality of spiral ventilation hole, the spiral ventilation hole is passed through radial branch hole intercommunication between the axial straight through air hole, including the stator, the inner ring of stator is equipped with a plurality of groups of winding, and the both ends of stator are symmetrically equipped with the heat dissipation ring, still including front end cover, rear end cover and pivot, the pivot is rotatedly connected with front end cover and rear end cover through the bearing, the rear section of pivot still has the coaxial fixed mounting of fan impeller. The utility model sets up axial straight through air hole, spiral ventilation hole and radial branch hole and forms "tree shape" airflow network, improves the full flowability of airflow in the rotor, and then improves the heat dissipation effect, and the heat dissipation ring and the heat dissipation tooth cooperation of setting simultaneously, effectively expands the contact area of stator and airflow, and then improves the heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to permanent magnet motor rotor assembly, stator assembly and permanent magnet motor. Background Technology

[0002] A permanent magnet motor is a type of motor that uses permanent magnets to create a magnetic field. It is a type of synchronous motor and features high efficiency, high power density, and low maintenance costs. Its core structure includes a stator assembly and a rotor assembly. The stator assembly consists of an iron core and slots with coils wound around it. When alternating current is applied, it generates a rotating magnetic field. The rotor assembly has built-in permanent magnets and does not require external excitation. The magnetic field strength is constant.

[0003] Currently, permanent magnet motors generate significant heat in both the stator and rotor assemblies during operation. Therefore, a fan impeller that rotates coaxially with the shaft is typically built into the design to accelerate the removal of internal heat. However, the existing structural design of the stator and rotor assemblies is not conducive to the full flow of cooling air within the motor, thus affecting the efficiency and effectiveness of heat dissipation.

[0004] To address these issues, we propose a permanent magnet motor rotor assembly, a stator assembly, and a permanent magnet motor itself. Utility Model Content

[0005] The purpose of this invention is to provide a permanent magnet motor rotor assembly, a stator assembly, and a permanent magnet motor to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A permanent magnet motor rotor assembly includes a rotor, wherein a plurality of axial straight ventilation holes are provided on the rotor near the shaft center, and a plurality of spiral ventilation holes are provided on the rotor near the periphery. The spiral ventilation holes and the axial straight ventilation holes are connected by radial branch holes, and a plurality of heat dissipation fins are symmetrically provided at both ends of the rotor.

[0008] In a further embodiment, the rotation directions of adjacent spiral ventilation holes are opposite.

[0009] In a further embodiment, the inner wall of the spiral ventilation hole is provided with continuous spiral ribs.

[0010] In a further embodiment, the port of the spiral ventilation hole is chamfered to form a tapered guide port.

[0011] A permanent magnet motor stator assembly includes a stator, the inner ring of which is provided with multiple sets of windings, and heat dissipation rings are symmetrically provided at both ends of the stator. Several U-shaped grooves are evenly opened on the outer side wall of the stator.

[0012] In a further embodiment, the inner ring of the heat dissipation ring is provided with two layers of stepped heat dissipation teeth.

[0013] The permanent magnet motor includes the rotor assembly and the stator assembly, and also includes a front cover, a rear cover and a rotating shaft. The rotating shaft is rotatably connected to the front cover and the rear cover through bearings, and the rotating shaft is coaxially connected and fixed to the rotor. A fan impeller is also coaxially fixedly installed on the rear section of the rotating shaft. U-shaped blocks corresponding to U-shaped grooves are evenly provided on the inner wall of the rear cover.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention features a tree-like airflow network formed by axial straight ventilation holes, spiral ventilation holes, and radial branch holes, which improves the flow of air within the rotor and thus enhances heat dissipation. At the same time, the heat dissipation ring and heat dissipation teeth work together to effectively expand the contact area between the stator and the airflow, thereby improving heat dissipation efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the rotor assembly structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the stator assembly structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the permanent magnet motor of this utility model after partial cross-section.

[0019] In the diagram: 1. Rotor; 11. Axial straight ventilation hole; 12. Spiral ventilation hole; 13. Spiral rib; 14. Radial branch hole; 15. Heat dissipation fins; 2. Stator; 21. Winding; 22. Heat dissipation ring; 23. Heat dissipation teeth; 24. U-shaped groove; 3. Front end cover; 4. Rear end cover; 41. U-shaped block; 5. Shaft; 6. Fan impeller. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 The permanent magnet motor rotor assembly includes a rotor 1. Three axial straight ventilation holes 11 are located near the shaft center on the rotor 1, and six spiral ventilation holes 12 are located near the outer periphery of the rotor 1. Each pair of spiral ventilation holes 12 corresponds to one axial straight ventilation hole 11, and the spiral ventilation holes 12 and the axial straight ventilation holes 11 are connected by radial branch holes 14, thus forming a "tree-like" airflow network. The airflow velocity is high when passing through the axial straight ventilation holes 11, but the contact time with the inner wall of the rotor 1 is short. The spiral ventilation holes 12, however, can prolong the airflow time within the rotor 1. This creates a centrifugal pressurized airflow to facilitate heat exchange and removal. The centrifugal airflow can also enter the axial straight ventilation hole 11 through the radial branch hole 14, improving the airflow turbulence effect. Specifically, the spiral ventilation holes 12 have opposite rotation directions, forming staggered airflow disturbances. The inner wall of the spiral ventilation hole 12 is provided with continuous spiral ribs 13, which improves the heat dissipation coefficient through secondary vortex. The port of the spiral ventilation hole 12 is chamfered to form a conical guide port, which helps to reduce wind resistance. Several heat dissipation fins 15 are symmetrically provided at both ends of the rotor 1 to increase the contact area with the airflow.

[0024] Please see Figure 2 The permanent magnet motor stator assembly includes a stator 2. The inner ring of the stator 2 is provided with multiple sets of windings 21, and the two ends of the stator 2 are symmetrically provided with heat dissipation rings 22. Specifically, the inner ring of the heat dissipation ring 22 is provided with two layers of stepped heat dissipation teeth 23. The stepped shape can not only form an expansion opening to guide the airflow, but also increase the heat dissipation area. Several U-shaped grooves 24 are evenly opened on the outer wall of the stator 2 to increase the contact area with the motor housing, which is beneficial to accelerate heat dissipation.

[0025] Please see Figure 3The permanent magnet motor includes the aforementioned rotor assembly and stator assembly, and also includes a front cover 3, a rear cover 4, and a rotating shaft 5. The rotor assembly is installed inside the stator assembly. The front cover 3 covers the front end of the motor, and the rear cover 4 covers the rear end of the motor. The front cover 3 and the rear cover 4 are locked together by bolts and nuts. The rotating shaft 5 is rotatably connected to the front cover 3 and the rear cover 4 through bearings. The rotating shaft 5 extends out of the front cover 3 and is coaxially connected and fixed to the rotor 1. A fan impeller 6 is also coaxially fixedly installed on the rear section of the rotating shaft 5. The inner wall of the rear cover 4 is also evenly provided with U-shaped blocks 41 that correspond one-to-one with the U-shaped grooves 24. After the motor housing is installed, the U-shaped blocks 41 are inserted into the U-shaped grooves 24 and are in close contact with them. This not only increases the contact area but also limits the stator 2 and prevents it from deflecting.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A permanent magnet motor rotor assembly, comprising a rotor (1), characterized in that: The rotor (1) has several axial straight ventilation holes (11) near the shaft center and several spiral ventilation holes (12) near the outer periphery. The spiral ventilation holes (12) and the axial straight ventilation holes (11) are connected by radial branch holes (14). Several heat dissipation fins (15) are symmetrically provided at both ends of the rotor (1).

2. The permanent magnet motor rotor assembly according to claim 1, characterized in that: The rotation directions of adjacent spiral ventilation holes (12) are opposite.

3. The permanent magnet motor rotor assembly according to claim 1, characterized in that: The inner wall of the spiral ventilation hole (12) is provided with continuous spiral ribs (13).

4. The permanent magnet motor rotor assembly according to claim 1, characterized in that: The spiral ventilation hole (12) is chamfered at its port to form a tapered guide.

5. A permanent magnet motor stator assembly, comprising a stator (2), characterized in that: The inner ring of the stator (2) is provided with multiple sets of windings (21), and the two ends of the stator (2) are symmetrically provided with heat dissipation rings (22). Several U-shaped grooves (24) are evenly opened on the outer side wall of the stator (2).

6. The permanent magnet motor stator assembly according to claim 5, characterized in that: The inner ring of the heat dissipation ring (22) is provided with two layers of stepped heat dissipation teeth (23).

7. A permanent magnet motor, comprising a rotor assembly as described in any one of claims 1-4 and a stator assembly as described in any one of claims 5-6, characterized in that: It also includes a front cover (3), a rear cover (4) and a rotating shaft (5). The rotating shaft (5) is rotatably connected to the front cover (3) and the rear cover (4) through bearings, and the rotating shaft (5) is coaxially connected and fixed to the rotor (1). A fan impeller (6) is also coaxially fixedly installed on the rear section of the rotating shaft (5). U-shaped blocks (41) corresponding to the U-shaped grooves (24) are also evenly provided on the inner wall of the rear cover (4).

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