Inner oil cooling three-phase permanent magnet motor

Abstract

The utility model discloses an internal oil cooling three-phase permanent magnet motor, which comprises a rotor assembly, a stator assembly, an end cover assembly and an oil cooling system, and is characterized in that the rotor assembly is sleeved on a hollow motor shaft and comprises a rotor silicon steel sheet assembly and a rotor permanent magnet assembly; wherein each sheet body of the rotor silicon steel sheet assembly is uniformly provided with a plurality of magnetic steel grooves for embedding each permanent magnet of the rotor permanent magnet assembly in the circumferential direction, and the stator assembly comprises a stator silicon steel sheet assembly and a stator coil. Each sheet body of the rotor silicon steel sheet assembly is uniformly provided with a plurality of winding grooves in the circumferential direction, and the stator coil windings pass through the winding grooves. According to the utility model, the structure is greatly simplified, the maintenance is convenient, and the operation stability is improved; in addition, the air gap between the internal rotor assembly and the stator assembly is large, related problems and the like are not likely to occur in operation, energy efficiency improvement, operation performance improvement and maintenance cost reduction can be remarkably achieved, and the motor is an optimal scheme for energy conservation, emission reduction and production efficiency improvement in the industry.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor structure technology, specifically an internally oil-cooled three-phase permanent magnet motor. Background Technology

[0002] An oil-cooled sol-gel motor is a type of motor that uses oil cooling technology. It uses oil as the cooling medium, which directly contacts the motor's heat sources to improve heat dissipation efficiency. Oil cooling effectively removes heat generated inside the motor, keeping it within a suitable operating temperature range, thus ensuring the motor's performance and lifespan. In an oil-cooled motor, the cooling oil typically flows through specific oil passages to key components such as the stator and rotor. The cooling oil not only removes heat generated by the stator windings but also cools the rotor and other internal components. This cooling method achieves better heat exchange, and is particularly suitable for high-power-density motors, as these motors generate a large amount of heat during operation. Oil-cooled motor designs may include direct and indirect oil cooling. Direct oil cooling refers to the cooling oil directly contacting the motor's heat-generating components, while indirect oil cooling transfers heat through intermediate devices such as heat exchangers.

[0003] Direct oil-cooled motors primarily rely on the flow and circulation of cooling oil. As the oil flows inside the motor, it carries away heat and is cooled by an external radiator or oil cooler before circulating back into the motor. This circulating cooling mechanism helps maintain stable motor operation, especially under prolonged high-load conditions.

[0004] Most existing rotor assemblies and motor shafts adopt a solid structure, resulting in a heavy rotor weight, a heavy overall structure, and a large moment of inertia. This affects the motor's response speed, such as insufficient speed in starting, accelerating, decelerating, and stopping, and poor high-speed reciprocating performance. This limits the range of applications for the rotor and makes it unsuitable for some light-load and high-speed positioning applications. Utility Model Content

[0005] The purpose of this invention is to overcome the defects and deficiencies of the existing technology and provide an internally oil-cooled three-phase permanent magnet motor, which solves the various problems existing in the existing technology.

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

[0007] An internally oil-cooled three-phase permanent magnet motor includes a rotor assembly, a stator assembly, an end cover assembly, and an oil cooling system. The rotor assembly is mounted on a hollow motor shaft. The rotor assembly includes a rotor silicon steel sheet assembly and a rotor permanent magnet assembly. Each sheet of the rotor silicon steel sheet assembly has multiple magnetic steel slots evenly distributed in the circumferential direction for each permanent magnet of the rotor permanent magnet assembly to be embedded.

[0008] The stator assembly includes a stator silicon steel sheet assembly and a stator coil. Each sheet of the rotor silicon steel sheet assembly has multiple winding slots evenly distributed in the circumferential direction for the stator coil windings to pass through.

[0009] The end cover assembly includes a front cover and a rear cover. The rotor assembly and stator assembly are encapsulated by the front and rear covers and the housing after assembly.

[0010] The oil cooling system includes an oil inlet connector located at the rear end of the housing and an oil outlet connector located at the front end of the housing. The oil inlet connector and the oil outlet connector are respectively connected to the oil pump and the oil tank of the oil pipeline system.

[0011] The motor shaft includes a rotor mounting part and an output shaft. The rotor mounting part is a hollow cylindrical structure with keyways distributed on it. A rotor silicon steel sheet assembly is mounted and fixed on the cylinder by a key and a retaining ring at the end of the shaft. A gear segment is distributed at the end of the output shaft.

[0012] After the rotor permanent magnet assembly is embedded in the corresponding magnet slot, the inner side of the magnet slot is provided with circumferential arc-shaped adhesive grooves spaced along the inner circumferential direction of the sheet body. The circumferential arc-shaped adhesive grooves are connected to the magnet slots. A radially arranged strip-shaped adhesive groove is provided between adjacent magnet slots. The front and rear ends of the rotor permanent magnet assembly are press-fitted by a disc.

[0013] FRP gaskets are respectively installed at the bottom of the winding slots on the stator silicon steel sheet assembly.

[0014] The front and rear covers are rotatably mounted on the motor shaft via bearings. The motor shaft extends out of the front cover, and a planetary reducer is installed at the extended end. A hollow front wheel disc bracket is installed at the front end of the planetary reducer bracket, and a front cover is rotatably mounted on the front wheel disc bracket.

[0015] The rear end of the motor shaft extends out of the rear cover, and a resolver is installed at the extended end. A rear end cover is installed at the rear end of the rear cover, and the resolver is located inside the rear end cover.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This application utilizes a hollow structure with a hollow motor shaft and a rotor core to reduce rotor inertia, resulting in faster motor start-up and braking times, making it suitable for operation under rapid response conditions.

[0018] It can also meet the needs of some compact installation equipment with reduced size and weight;

[0019] The rotor structure is greatly simplified. By combining arc-shaped glue channels and strip-shaped glue channels, the rotor silicon steel sheet assembly and permanent magnet can be glued simultaneously to achieve overall glue injection, which can greatly improve the glue injection efficiency of the rotor. On the other hand, the dead zone of the existing rotor glue injection channel must be eliminated.

[0020] The rotor structure of this application is greatly simplified, making maintenance easier and improving operational stability; in addition, the air gap between the internal rotor assembly and the stator assembly is large, making it unlikely that related problems such as bearing electrocorrosion will occur during operation.

[0021] The low noise and vibration during operation are very beneficial for improving the working environment and operator comfort. Especially in the injection molding machine industry, the fast response and large starting torque allow the motor to start only when the injection molding machine needs to complete the injection molding process. During the material feeding and mold closing processes, the oil pump main motor is in a stopped state, achieving intermittent zero power consumption, thereby greatly improving energy efficiency.

[0022] In summary, the motor structure described in this application can bring significant improvements in energy efficiency, operational performance, and maintenance costs, making it a preferred solution for energy conservation, emission reduction, and increased production efficiency in the industry. Attached Figure Description

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

[0024] Figure 2 for Figure 1 The structural sectional view in the middle;

[0025] Figure 3 This is a schematic diagram of the stator assembly.

[0026] Figure 4 This is a schematic diagram of the motor shaft.

[0027] Figure 5 This is a schematic diagram of the rotor assembly.

[0028] Figure label:

[0029] 1. Rotor assembly; 2. Stator assembly; 3. End cover assembly; 4. Motor shaft; 5. Housing; 6. Oil inlet connector; 7. Oil outlet connector; 8. Resolver; 9. Rear end cover; 10. Rotor silicon steel sheet assembly; 11. Rotor permanent magnet assembly; 12. Magnet slot; 13. Circumferential arc-shaped rubber groove; 14. Strip rubber groove; 15. Planetary reducer; 16. Front disc bracket; 17. Front end cover; 21. Stator silicon steel sheet assembly; 22. Winding slot; 23. FRP gasket; 31. Front cover; 32. Rear cover; 41. Rotor mounting section; 42. Output shaft; 43. Keyway; 44. Gear section. Detailed Implementation

[0030] 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 scope of protection of the present utility model.

[0031] See appendix Figure 1-5 ;

[0032] An internally oil-cooled three-phase permanent magnet motor includes a rotor assembly 1, a stator assembly 2, an end cover assembly 3, and an oil cooling system;

[0033] The rotor assembly 1 is mounted on a hollow motor shaft 4. The motor shaft 4 includes a rotor mounting section 41 and an output shaft 42. The rotor mounting section 41 is a hollow cylindrical structure with keyways 43 distributed on it. The rotor silicon steel sheet assembly 10 is mounted and fixed to the shaft via keys and end retaining rings. The output shaft 42 has gear sections 44 distributed at its ends. The motor shaft is a crucial component of the motor, responsible for converting electrical energy into mechanical energy and transmitting this energy to the load to perform useful work. The motor shaft generates mechanical power through rotation and transmits this power to the load through bearings and other components, enabling it to operate normally. Through a special structural design, the motor shaft meets the size and transmission matching requirements of the permanent magnet assembly. Its cylindrical structure, forming a hollow structure, greatly reduces the weight of the rotor, resulting in faster motor start-up and braking times, making it suitable for operation under rapid response conditions. The hollow motor shaft, when fitted with the rotor, can increase the mating diameter between the shaft and the iron core, reducing motor weight, saving costs, and increasing the power density of the motor.

[0034] Furthermore, the rotor assembly 1 includes a rotor silicon steel sheet assembly 10 and a rotor permanent magnet assembly 11. Each sheet of the rotor silicon steel sheet assembly 10 has multiple magnetic slots 12 evenly distributed circumferentially for embedding each permanent magnet of the rotor permanent magnet assembly. After the rotor permanent magnet assembly 11 is embedded in the corresponding magnetic slot 12, the inner side of the magnetic slot 12 is provided with circumferentially arc-shaped adhesive grooves 13 spaced along the inner circumferential direction of the sheet. The circumferentially arc-shaped adhesive grooves 13 communicate with the magnetic slots 12. Radially arranged strip-shaped adhesive grooves 14 are provided between adjacent magnetic slots 12. The front and rear ends of the rotor permanent magnet assembly 11 are press-fitted by a disc. Because the rotor mounting part has a hollow cylindrical structure, the rotor portion is thinner, reducing weight and making the rotor's structural arrangement easier, thus meeting the needs of compact installation equipment requiring reduced size and weight.

[0035] Furthermore, the stator assembly 2 includes a stator silicon steel sheet assembly 21 and stator coils. Each sheet of the rotor silicon steel sheet assembly 10 has multiple winding slots 22 evenly distributed circumferentially for the stator coil windings to pass through. The end cover assembly 3 includes a front cover 31 and a rear cover 32. After the rotor assembly 1 and stator assembly 2 are assembled, they are encapsulated by the front and rear covers and the housing 5. FRP gaskets 23 are respectively fitted to the bottom of the winding slots 22 on the stator silicon steel sheet assembly 21. In the motor stator, the main function of the FRP fiber-reinforced plastic gasket is to provide insulation and support. Specifically, the FRP gasket can: Insulate: Prevent electrical short circuits between the stator windings and the iron core or other metal components, ensuring the safe operation of the motor. Support: Help fix the stator windings, reduce vibration and mechanical stress, thereby improving the stability and lifespan of the motor. Corrosion resistance: FRP material has good corrosion resistance, protecting the inside of the motor from corrosive environments. In summary, FRP gaskets play an important role in insulation, support, and protection in motor stators, contributing to improved overall motor performance and reliability.

[0036] Furthermore, the front and rear covers are rotatably mounted on the motor shaft 4 via bearings. The motor shaft 4 extends out of the front cover 31, and a planetary reducer 15 is mounted on the extended end. A hollow front wheel disc bracket 16 is mounted on the front end of the planetary reducer 15 bracket, and a front cover 17 is rotatably mounted on the front wheel disc bracket 16. The planetary reducer has high precision and stability, which can effectively reduce noise and vibration during transmission, thereby improving the stability and reliability of the equipment. The front wheel disc bracket can absorb and mitigate the vibration generated during motor operation, thereby reducing noise and mechanical wear, making the installation and disassembly of the motor more convenient. The front cover is fitted onto the bracket to protect the entire motor, and the front cover is rotatably mounted via bearings and sealed with a shaft seal.

[0037] The rear end of the motor shaft 4 extends out of the rear cover 32, and a resolver 8 is installed at the extended end. A rear end cover 9 is installed at the rear end of the rear cover 32, and the resolver 8 is located inside the rear end cover 9. The resolver senses the relative position change between the stator and rotor, and uses the principle of electromagnetic coupling to convert the rotor's angle information into an electrical signal output. It can accurately measure the rotor's angle and position, which is crucial for motor control. By analyzing the sine and cosine signals output by the resolver, the absolute position of the rotor can be obtained; the rotor speed can also be calculated by monitoring the change of angle over time. The angle, position, and speed information are used as feedback signals to help the motor control system adjust and optimize the motor's operating state. It plays an important role in the motor, helping the motor control system achieve efficient and stable operation by providing accurate angle, position, and speed information.

[0038] Furthermore, the oil cooling system includes an oil inlet connector 6 located at the rear end of the housing 5 and an oil outlet connector 7 located at the front end of the housing. The oil inlet connector 6 and the oil outlet connector 7 are respectively connected to the oil pump and oil tank of the oil circuit system through oil pipelines. The oil cooling system can remove more heat in a smaller volume, effectively reducing the motor operating temperature, improving motor efficiency and lifespan. Moreover, oil cooling can effectively control motor temperature fluctuations, making the motor more stable and reliable during long-term high-load operation. There is no need to worry about damage or safety hazards caused by coolant leakage because oil is non-conductive and can directly contact magnetic materials for cooling. It can adapt to different working environments and climatic conditions, ensuring stable and reliable operation.

[0039] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. 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.

[0040] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. An internally oil-cooled three-phase permanent magnet motor, comprising a rotor assembly (1), a stator assembly (2), an end cover assembly (3), and an oil cooling system, characterized in that, The rotor assembly (1) is mounted on the hollow motor shaft (4). The rotor assembly (1) includes a rotor silicon steel sheet assembly (10) and a rotor permanent magnet assembly (11). Each sheet of the rotor silicon steel sheet assembly (10) is provided with a plurality of magnetic steel slots (12) evenly distributed in the circumferential direction for each permanent magnet of the rotor permanent magnet assembly to be embedded. The stator assembly (2) includes a stator silicon steel sheet assembly (21) and a stator coil. Each piece of the rotor silicon steel sheet assembly (10) is provided with a plurality of winding slots (22) evenly distributed in the circumferential direction for the stator coil winding to pass through. The end cover assembly (3) includes a front cover (31) and a rear cover (32). The rotor assembly (1) and the stator assembly (2) are assembled and then encapsulated by the front and rear covers and the housing (5). The oil cooling system includes an oil inlet connector (6) located at the rear end of the housing (5) and an oil outlet connector (7) located at the front end of the housing. The oil inlet connector (6) and the oil outlet connector (7) are respectively connected to the oil pump and the oil tank of the oil pipeline system.

2. The internally oil-cooled three-phase permanent magnet motor according to claim 1, characterized in that, The motor shaft (4) includes a rotor mounting part (41) and an output shaft (42). The rotor mounting part (41) is a hollow cylindrical structure. Keyways (43) are distributed on the cylindrical body, and a rotor silicon steel sheet assembly (10) is installed and fixed by a key and a retaining ring at the end shaft. A gear section (44) is distributed at the end of the output shaft (42).

3. The internally oil-cooled three-phase permanent magnet motor according to claim 1, characterized in that, After the rotor permanent magnet assembly (11) is embedded in the corresponding magnet slot (12), the inner side of the magnet slot (12) is provided with a circumferential arc-shaped glue channel (13) spaced along the inner circumferential direction of the sheet body. The circumferential arc-shaped glue channel (13) is connected to the magnet slot (12). A radially arranged strip glue channel (14) is provided between adjacent magnet slots (12). The front and rear ends of the rotor permanent magnet assembly (11) are press-fitted by a disc.

4. The internally oil-cooled three-phase permanent magnet motor according to claim 1, characterized in that, The bottom of the winding groove (22) on the stator silicon steel sheet assembly (21) is respectively fitted with (23).

5. The internally oil-cooled three-phase permanent magnet motor according to claim 1, characterized in that, The front and rear covers are respectively mounted on the motor shaft (4) via bearings. The motor shaft (4) extends out of the front cover (31) and a planetary reducer (15) is installed at the extended end. A hollow wheel disc bracket (16) is installed at the front end of the bracket of the planetary reducer (15). A front cover (17) is rotatably mounted on the wheel disc bracket (16).

6. The internally oil-cooled three-phase permanent magnet motor according to claim 5, characterized in that, The rear end of the motor shaft (4) extends out of the rear cover (32), and a resolver (8) is installed at the extended end. A rear end cover (9) is installed at the rear end of the rear cover (32), and the resolver (8) is located inside the rear end cover (9).

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