Permanent magnet synchronous motor with simplified structure

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a permanent magnet synchronous motor with a simplified structure, which comprises a base, a stator fixedly connected in the base, a first end cover and a second end cover fixedly connected at two ends of the base respectively, a first bearing chamber arranged in the first end cover, a first bearing arranged in the first bearing chamber, and a second bearing arranged in the second end cover. A first bearing chamber is arranged in the first end cover, a second bearing chamber is arranged in the second end cover, a second bearing is arranged in the second bearing chamber, a rotor is arranged between the first bearing and the second bearing, and the rotor and the stator are correspondingly arranged. And the production and assembly cost and workload of the motor are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to a simplified permanent magnet synchronous motor. Background Technology

[0002] In modern industry and power systems, motors, as the core equipment for energy conversion, play a crucial role in the operating efficiency and stability of the entire system. With the advancement of technology and the increasing requirements for energy efficiency and control performance, the simplified permanent magnet synchronous motor has gradually emerged. Compared with traditional motors, the simplified permanent magnet synchronous motor has more significant performance advantages.

[0003] The simplified permanent magnet synchronous motor has a shaft supported by bearings. Both sides of the bearing are equipped with inner and outer covers to limit the axial position of the shaft and bearing. The use of inner and outer covers provides some protection for the bearing, but it makes the motor structure more complex, increasing the cost and workload of motor production and assembly. Simplifying the motor structure, reducing maintenance needs and improving energy efficiency are important ways to achieve green and sustainable development. Utility Model Content

[0004] The main technical problem to be solved by this utility model is to provide a simplified permanent magnet synchronous motor, which can reduce the number of parts in the motor, simplify the structure of the motor, and reduce the cost and workload of motor production and assembly.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A simplified permanent magnet synchronous motor includes a frame, a stator fixedly connected inside the frame, a first end cover and a second end cover fixedly connected to both ends of the frame, a first bearing chamber opened in the first end cover and a first bearing disposed in the first bearing chamber, a second bearing chamber opened in the second end cover and a second bearing disposed in the second bearing chamber, and a rotor disposed between the first bearing and the second bearing, with the rotor and stator correspondingly arranged.

[0007] The following are further optimizations of the above technical solution by this utility model:

[0008] The rotor includes a shaft, which is rotatably connected to a first bearing and a second bearing. The inner rings of the first bearing and the inner rings of the second bearing are in close contact with the first and second shoulders of the shaft, respectively. The outer ring of the first bearing is in close contact with the inner wall of the first bearing chamber. A gap S is provided between the outer ring of the second bearing and the inner wall of the second bearing chamber.

[0009] Further optimization: The value of the gap S is 1±0.15mm.

[0010] Further optimization: A perforated elastic retaining ring is snapped into the housing of the first bearing, and the perforated elastic retaining ring is in close contact with the outer ring of the first bearing.

[0011] Further optimization: The first end cap and the second end cap are respectively provided with a first mounting groove and a second mounting groove at their ends that are far apart from each other. A first oil seal is provided in the first mounting groove and a second oil seal is provided in the second mounting groove.

[0012] Further optimization: The end of the shaft near the first end cover extends to the outside and is fitted with a fan.

[0013] This utility model adopts the above-mentioned technical solution, omitting the inner and outer covers of the bearing, reducing the number of parts in the motor as a whole, simplifying the motor structure, thereby reducing production and assembly costs and workload; the motor structure is more compact, which can reduce the size and weight of the motor to a certain extent, increase the power density of the motor, and also provide more flexibility for the internal layout and structural design of the motor; the bearing has more direct contact with the external environment, and the fan at the tail end of the motor can blow directly on the bearing, making the heat dissipation path smoother, the heat is more easily dissipated, reducing the operating temperature of the bearing, and helping to improve the service life and reliability of the bearing.

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0016] Figure 2 This is a side view of the rotor structure in an embodiment of the present invention;

[0017] Figure 3 for Figure 1 Enlarged structural diagram at point A;

[0018] Figure 4 for Figure 1 A magnified structural diagram at point B in the middle.

[0019] In the diagram: 1-Frame; 2-Stator; 3-First end cover; 301-First bearing chamber; 302-First mounting slot; 4-Second end cover; 401-Second bearing chamber; 402-Second mounting slot; 5-First bearing; 6-Second bearing; 7-Rotor; 701-Shaft; 7011-First shoulder; 7012-Second shoulder; 702-Magnet; 703-Rotor core; 704-Double-ended bolt; 8-Elastic retaining ring for holes; 9-First oil seal; 10-Second oil seal; 11-Fan; 12-Elastic retaining ring for shaft; 13-Fan cover. Detailed Implementation

[0020] like Figure 1-4 As shown: A simplified permanent magnet synchronous motor includes a frame 1, a stator 2 fixedly connected inside the frame 1, a first end cover 3 and a second end cover 4 fixedly connected to both ends of the frame 1 respectively, a first bearing chamber 301 is opened inside the first end cover 3, a first bearing 5 is arranged inside the first bearing chamber 301, a second bearing chamber 401 is opened inside the second end cover 4, a second bearing 6 is arranged inside the second bearing chamber 401, and a rotor 7 is arranged between the first bearing 5 and the second bearing 6, with the rotor 7 corresponding to the stator 2.

[0021] This design eliminates the inner and outer bearing covers, reducing the overall number of motor parts and simplifying the motor structure, thereby reducing production and assembly costs and workload. The motor structure is more compact, which can reduce the size and weight of the motor to a certain extent, increase the power density of the motor, and also provide more flexibility for the internal layout and structural design of the motor.

[0022] Both the first bearing 5 and the second bearing 6 are deep groove ball bearings.

[0023] The rotor 7 includes a rotating shaft 701, which is rotatably connected to the first bearing 5 and the second bearing 6. A rotor core 703 is fixedly connected to the rotating shaft 701. A magnet 702 is provided inside the rotor core 703. Double-ended bolts 704 are inserted into the rotor core 703 and the magnet 702. Nuts are threaded to both ends of the double-ended bolts 704. The rotor core 703 and the magnet 702 are clamped by locking the nuts.

[0024] The material of magnet 702 is N38UH.

[0025] The inner rings of the first bearing 5 and the inner rings of the second bearing 6 are in close contact with the first shoulder 7011 and the second shoulder 7012 of the rotating shaft 701, respectively. The outer ring of the first bearing 5 is in close contact with the inner wall of the first bearing chamber 301. A gap S is provided between the outer ring of the second bearing 6 and the inner wall of the second bearing chamber 401.

[0026] This design, with a clearance S at position 6 of the second bearing, serves several purposes: First, it compensates for errors, including those in the machining and installation of motor components, ensuring smooth bearing installation and normal operation, guaranteeing a uniform air gap between the rotor and stator, and improving operational stability and efficiency. Second, it adapts to vibration, mitigating the impact of electromagnetic and external mechanical vibrations on the bearing, protecting the bearing, and improving the motor's vibration resistance. Third, it facilitates lubrication and heat dissipation, providing a channel for the flow and circulation of lubricating oil, increasing the contact area with air, and helping to remove heat and wear particles, ensuring lubrication and heat dissipation, and improving bearing reliability and overall motor performance.

[0027] The preferred value for the gap S is 1 ± 0.15 mm.

[0028] A perforated elastic retaining ring 8 is snapped into the first bearing housing 301. The perforated elastic retaining ring 8 is in close contact with the outer ring of the first bearing 5. It is used to replace the bearing cover to limit the axial position of the first bearing 5, prevent its axial movement, and reduce the manufacturing cost of the motor.

[0029] The first end cover 3 and the second end cover 4 are respectively provided with a first mounting groove 302 and a second mounting groove 402 at their ends that are far apart from each other. A first oil seal 9 is provided in the first mounting groove 302 and a second oil seal 10 is provided in the second mounting groove 402. This avoids the loss of lubricating oil in the bearing, prevents external dust from entering the bearing and increasing bearing wear, and reduces the service life of the bearing.

[0030] The first oil seal 9 and the second oil seal 10 are preferably skeleton oil seals.

[0031] One end of the shaft 701 near the first end cover 3 extends outward and is fitted with a fan 11.

[0032] With this design, the bearing is not shielded by inner or outer covers, allowing for more direct contact between the bearing and the external environment. Under the action of fan 11, the heat dissipation path is smoother, and heat is more easily dissipated, reducing the operating temperature of the bearing and improving its service life and reliability.

[0033] A shaft elastic retaining ring 12 is snapped onto the shaft 701 near the fan 11 to limit the axial position of the fan 11.

[0034] A fan cover 13 is fixed to one end of the base 1 near the fan 11 to protect the fan 11.

[0035] For those skilled in the art, any changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of this utility model, based on the teachings of this utility model, still fall within the protection scope of this utility model.

Claims

1. A permanent magnet synchronous motor of simplified construction comprising a frame (1), characterized in that: The stator (2) is fixed in the base (1), the first end cover (3) and the second end cover (4) are respectively fixed at both ends of the base (1), the first bearing chamber (301) is arranged in the first end cover (3), the first bearing (5) is arranged in the first bearing chamber (301), the second bearing chamber (401) is arranged in the second end cover (4), the second bearing (6) is arranged in the second bearing chamber (401), the rotor (7) is arranged between the first bearing (5) and the second bearing (6), and the rotor (7) and the stator (2) are correspondingly arranged.

2. A permanent magnet synchronous motor of reduced complexity according to claim 1, characterized in that: The rotor (7) comprises a rotating shaft (701), the rotating shaft (701) is rotationally connected with the first bearing (5) and the second bearing (6), the inner ring of the first bearing (5) and the inner ring of the second bearing (6) are respectively in close contact with the first shaft shoulder (7011) and the second shaft shoulder (7012) of the rotating shaft (701), the outer ring of the first bearing (5) is in close contact with the inner wall of the first bearing chamber (301), and the outer ring of the second bearing (6) is arranged with a gap S from the inner wall of the second bearing chamber (401).

3. A simplified construction permanent magnet synchronous motor according to claim 2, characterized in that: The gap S is 1±0.15mm.

4. A permanent magnet synchronous motor of reduced complexity according to claim 3, characterized in that: The hole elastic retainer ring (8) is clamped in the first bearing chamber (301) and is in close contact with the outer ring of the first bearing (5).

5. A permanent magnet synchronous motor of reduced complexity according to claim 4, characterized in that: The first end cover (3) and the second end cover (4) are respectively provided with the first installation slot (302) and the second installation slot (402) at the ends away from each other, the first oil seal (9) is arranged in the first installation slot (302), and the second oil seal (10) is arranged in the second installation slot (402).

6. A permanent magnet synchronous motor of reduced complexity according to claim 5, characterized in that: The end of the rotating shaft (701) close to the first end cover (3) extends to the outside and is provided with the fan (11).

7. A permanent magnet synchronous motor of reduced complexity according to claim 6, characterized in that: The shaft elastic retainer ring (12) is clamped on the rotating shaft (701) close to the fan (11).

8. A simplified construction permanent magnet synchronous motor according to claim 7, characterized in that: The base (1) is fixedly connected with the fan cover (13) close to the fan (11).

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