Permanent magnet synchronous motor rotor assembly

Abstract

The utility model discloses a rotor assembly of a permanent magnet synchronous motor, which belongs to the technical field of rotor assemblies and comprises a rotating shaft, a first rotor core and a second rotor core are sleeved at two ends of the periphery of the rotating shaft, and heat dissipation covers are arranged on one sides, far away from each other, of the first rotor core and the second rotor core. The heat dissipation cover is formed by combining a first conical cover and a second conical cover, the closing end of the first conical cover and the closing end of the second conical cover are fixed and connected in a sealed mode, air blades are arranged on the peripheries of the inner walls of the first conical cover and the second conical cover, and fixing sleeves are arranged in the first conical cover and the second conical cover. The heat dissipation covers are arranged at the two ends, far away from each other, of the first rotor iron core and the second rotor iron core, and the first conical cover and the second conical cover are used for forming the closing-up openings in the middle ends of the interiors of the heat dissipation covers, so that air is compressed when entering the connecting position of the first conical cover and the second conical cover, and the purpose of increasing the air velocity is achieved; therefore, the purpose of improving the heat dissipation effect is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of rotor assembly technology, specifically relating to a permanent magnet synchronous motor rotor assembly. Background Technology

[0002] A permanent magnet synchronous motor (PMSM) is a synchronous motor that uses permanent magnets to generate a magnetic field. The rotor speed is synchronized with the current frequency of the stator windings. A PMSM consists of a stator, rotor, and end covers. The stator is basically the same as a conventional induction motor, employing a laminated structure to reduce iron losses during operation. The rotor can be solid or made of laminated laminations. The armature windings can use concentrated full-pitch windings, distributed short-pitch windings, or unconventional windings. The working principle of a PMSM is based on the interaction between the rotating magnetic field generated by the stator and the magnetic field generated by the permanent magnets on the rotor. The rotor is equipped with pre-magnetized permanent magnets, which generate a strong magnetic field when rotating, thus providing greater output torque. The motor's control system precisely regulates the current to ensure that the motor rotor rotates synchronously with the rotating magnetic field, maintaining a stable operating state. Therefore, most existing elevator traction devices utilize PMSM technology for drive. However, because the traction device operates under load for extended periods, its temperature rises too quickly, which can affect the main unit's performance and also increase the risk of demagnetization of the magnets in the rotor assembly.

[0003] Currently, existing permanent magnet synchronous motor rotor assemblies generally suppress the problem of excessively rapid temperature rise by increasing the power of the traction device. However, such a design leads to an increase in the overall size of the motor and the number of copper wires and magnets, which greatly increases the cost. Therefore, we propose a permanent magnet synchronous motor rotor assembly. Utility Model Content

[0004] The purpose of this invention is to provide a permanent magnet synchronous motor rotor assembly to solve the existing problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a permanent magnet synchronous motor rotor assembly, comprising a rotating shaft, a heat sink, a first conical cover, and a second conical cover. A first rotor core and a second rotor core are fitted onto the outer ends of the rotating shaft. The first and second rotor cores are fitted onto and fixedly connected to the outer periphery of the rotating shaft. A heat sink is provided on the side of the first and second rotor cores that are far apart from each other. The heat sink is composed of the first and second conical covers. The concave ends of the first and second conical covers are fixedly and sealed. Fan blades are fixedly installed around the inner walls of the first and second conical covers. A fixing sleeve is provided at the center of the first and second conical covers. The outer periphery of the fixing sleeve is fixedly connected to the fan blades. The heat sink is fitted onto and fixedly connected to the outer periphery of the rotating shaft via the fixing sleeve.

[0006] Preferably, both the first rotor core and the second rotor core end faces are provided with magnet positioning grooves. The magnet positioning grooves are U-shaped structures, and permanent magnets are fixedly installed inside the magnet positioning grooves by snap-fitting.

[0007] Preferably, an axial positioning hole is provided at the middle of the end face of both the first rotor core and the second rotor core, and the axial positioning hole penetrates through the first rotor core and the second rotor core.

[0008] Preferably, a magnetic pole positioning groove is formed on the inner wall of one side of the first rotor core and the second rotor core.

[0009] Preferably, a bearing is provided at the end of the rotating shaft, and the inner wall of the bearing is sleeved on the outer periphery of the end of the rotating shaft and fixedly connected thereto.

[0010] Preferably, the outer peripheral surfaces of the first rotor core and the second rotor core are provided with weight-reducing grooves, and the weight-reducing grooves are formed around the outer surfaces of the first rotor core and the second rotor core.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. By setting heat dissipation covers at the two ends of the first rotor core and the second rotor core that are far apart from each other, and by using the first conical cover and the second conical cover to form an opening at the middle of the inside of the heat dissipation cover, the air is compressed when it enters the connection between the first conical cover and the second conical cover, thereby increasing the air flow rate and thus improving the heat dissipation effect.

[0013] 2. By setting a fixing sleeve at the center of the heat sink to connect with the fan blades, the connection with the rotating shaft is achieved, ensuring the stability of the connection between the heat sink and the rotating shaft. This allows the heat sink and its internal fan blades to rotate synchronously with the rotating shaft, thus achieving the purpose of heat dissipation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the disassembly structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the heat sink structure of this utility model.

[0017] In the diagram: 1. Shaft; 2. First rotor core; 3. Second rotor core; 4. Magnet positioning slot; 5. Permanent magnet; 6. Axial positioning hole; 7. Magnetic pole positioning slot; 8. Bearing; 9. Heat sink; 10. First conical cover; 11. Second conical cover; 12. Fan blade; 13. Fixing sleeve; 14. Weight reduction slot. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-3 This utility model provides a technical solution for a permanent magnet synchronous motor rotor assembly: including a rotating shaft 1, a heat sink 9, a first conical cover 10, and a second conical cover 11. A first rotor core 2 and a second rotor core 3 are sleeved at both ends of the outer periphery of the rotating shaft 1. The first rotor core 2 and the second rotor core 3 are sleeved on the outer periphery of the rotating shaft 1 and fixedly connected thereto. A heat sink 9 is provided on the side of the first rotor core 2 and the second rotor core 3 that is far away from each other. The heat sink 9 is composed of the first conical cover 10 and the second conical cover 11. The concave ends of the first conical cover 10 and the second conical cover 11 are fixed and sealed. Fan blades 12 are fixedly installed on the inner walls of the first conical cover 10 and the second conical cover 11. A fixing sleeve 13 is provided at the center of the first conical cover 10 and the second conical cover 11. The outer periphery of the fixing sleeve 13 is fixedly connected to the fan blades 12. The heat sink 9 is sleeved on the outer periphery of the rotating shaft 1 and fixedly connected thereto through the fixing sleeve 13.

[0020] Specifically, the end faces of the first rotor core 2 and the second rotor core 3 are both provided with magnet positioning grooves 4. The magnet positioning grooves 4 are U-shaped structures, and permanent magnets 5 are fixedly installed inside the magnet positioning grooves 4 by snap-fit.

[0021] Specifically, axial positioning holes 6 are provided in the middle of the end faces of the first rotor core 2 and the second rotor core 3, and the axial positioning holes 6 penetrate the first rotor core 2 and the second rotor core 3.

[0022] Specifically, magnetic pole positioning grooves 7 are provided on one inner wall of the first rotor core 2 and the second rotor core 3.

[0023] Specifically, a bearing 8 is provided at the end of the rotating shaft 1, and the inner wall of the bearing 8 is sleeved on the outer periphery of the end of the rotating shaft 1 and fixedly connected to it.

[0024] Specifically, the outer peripheral surfaces of the first rotor core 2 and the second rotor core 3 are provided with weight reduction grooves 14, which are formed around the outer peripheral surfaces of the first rotor core 2 and the second rotor core 3.

[0025] In this embodiment, during use, a heat dissipation shroud 9 is installed on the side of the first rotor core 2 and the second rotor core 3 that are far apart from each other. A fixing sleeve 13 is fitted onto the outer circumference of the rotating shaft 1, making it fixedly connected to the rotating shaft 1. When the rotating shaft 1 rotates, it will drive the heat dissipation shroud 9 to rotate with the rotating shaft 1, thereby causing the fan blades 12 inside the heat dissipation shroud 9 to rotate, thereby driving the air to flow rapidly, thus achieving the purpose of heat dissipation. In addition, the first conical cover 10 and the second conical cover 11 are connected to each other at their conical ends, so that the interior of the heat dissipation shroud 9 forms a constriction. This causes the air to be compressed when it enters the connection between the first conical cover 10 and the second conical cover 11, thereby increasing the air flow rate and thus improving the heat dissipation effect. The rotor itself drives the heat dissipation shroud 9 to rotate, effectively realizing the function of improving the heat dissipation effect.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet synchronous motor rotor assembly, comprising a shaft (1), a heat sink (9), a first conical cover (10), and a second conical cover (11), characterized in that: The first rotor core (2) and the second rotor core (3) are sleeved on both ends of the outer periphery of the rotating shaft (1). The first rotor core (2) and the second rotor core (3) are sleeved on the outer periphery of the rotating shaft (1) and fixedly connected to it. A heat dissipation shroud (9) is provided on the side of the first rotor core (2) and the second rotor core (3) that are far apart from each other. The heat dissipation shroud (9) is composed of a first conical shroud (10) and a second conical shroud (11). The concave ends of the first conical shroud (10) and the second conical shroud (11) are fixed and sealed. Fan blades (12) are fixedly installed on all four sides of the inner walls of the first conical shroud (10) and the second conical shroud (11). A fixing sleeve (13) is provided at the center of the first conical shroud (10) and the second conical shroud (11). The outer periphery of the fixing sleeve (13) is fixedly connected to the fan blades (12). The heat dissipation shroud (9) is sleeved on the outer periphery of the rotating shaft (1) and fixedly connected to it through the fixing sleeve (13).

2. The permanent magnet synchronous motor rotor assembly according to claim 1, characterized in that: The first rotor core (2) and the second rotor core (3) are both provided with magnet positioning grooves (4). The magnet positioning grooves (4) are U-shaped structures. Permanent magnets (5) are fixedly installed inside the magnet positioning grooves (4) by snap-fit.

3. The permanent magnet synchronous motor rotor assembly according to claim 1, characterized in that: The first rotor core (2) and the second rotor core (3) are provided with axial positioning holes (6) in the middle of their end faces. The axial positioning holes (6) penetrate the first rotor core (2) and the second rotor core (3).

4. A permanent magnet synchronous motor rotor assembly according to claim 1, characterized in that: The inner wall of the first rotor core (2) and the second rotor core (3) is provided with a magnetic pole positioning groove (7).

5. A permanent magnet synchronous motor rotor assembly according to claim 1, characterized in that: The end of the rotating shaft (1) is provided with a bearing (8), and the inner wall of the bearing (8) is sleeved on the outer periphery of the end of the rotating shaft (1) and fixedly connected to it.

6. A permanent magnet synchronous motor rotor assembly according to claim 1, characterized in that: The outer peripheral surfaces of the first rotor core (2) and the second rotor core (3) are provided with weight reduction grooves (14), which are formed around the outer surfaces of the first rotor core (2) and the second rotor core (3).

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