Permanent magnet motor rotor and permanent magnet motor

Abstract

The utility model relates to the field of motors, and discloses a permanent magnet motor rotor and a permanent magnet motor, the permanent magnet motor rotor comprises a rotor body, a rotating shaft is arranged in the rotor body in a penetrating manner, the rotor body is provided with a permanent magnet mounting groove for placing a permanent magnet, and the permanent magnet is in interference fit with the two side surfaces and the bottom surface of the permanent magnet mounting groove; the permanent magnet mounting grooves for placing the permanent magnets are formed in the rotor body, the permanent magnets are in interference fit with the two side surfaces and the bottom surfaces of the permanent magnet mounting grooves, and the ventilation gaps exist between the permanent magnets and the top surfaces of the permanent magnet mounting grooves, so that the continuity of a magnetic circuit can be ensured, the magnetic flux density can be improved, and mechanical stress can be transmitted through a sufficient contact surface; the top surfaces of the permanent magnet mounting grooves do not make direct contact with the permanent magnets, an air channel is formed, the heat dissipation performance of the permanent magnet motor is improved, airflow is allowed to take away heat generated by the permanent magnets and the rotor body through the ventilation gaps, and demagnetization caused by overheating of the permanent magnets is avoided.

Description

Technical Field

[0001] The present application relates to the field of motors, and particularly to a permanent magnet motor rotor and a permanent magnet motor. Background Art

[0002] Permanent magnet synchronous motors use permanent magnets to provide excitation, making the motor structure relatively simple, reducing processing and assembly costs, eliminating the slip rings and brushes that are prone to problems, improving the reliability of motor operation, and also having no excitation current and no excitation loss, improving the efficiency and power density of the motor. They are widely used in many fields such as industrial automation, new energy vehicles, wind power generation, aerospace, and household appliances;

[0003] The rotor of a permanent magnet motor is one of its core components. Compared with traditional motors, its uniqueness lies in that permanent magnets are embedded in the rotor, and these permanent magnets are responsible for generating the necessary magnetic field, which interacts with the magnetic field generated by the stator winding to generate torque and drive the motor to operate;

[0004] The embedded motor rotor structure is a common design in permanent magnet motors. Its feature is that the permanent magnets are embedded inside the rotor rather than installed on the rotor surface. In the existing embedded motor rotor structure, the permanent magnets are embedded inside the rotor through anaerobic adhesive bonding process. When the motor operates under long-term load, a large amount of heat is generated inside the motor. Compared with traditional motors, the internal structure of the permanent magnet motor is compact and the air gap is small, so a good circulating air path cannot be formed, resulting in too high temperature inside the permanent magnet motor. The too high temperature will not only dilute the anaerobic adhesive, but also accelerate the demagnetization speed of the permanent magnets, thus affecting the use of the permanent magnet motor. To solve the above problems, a permanent magnet motor rotor and a permanent magnet motor are proposed.

[0005] The above information disclosed in this background art is only used to increase the understanding of the background art of the present application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Utility Model

[0006] To solve the motor problems, the present application provides a permanent magnet motor rotor and a permanent magnet motor.

[0007] The permanent magnet motor rotor and the permanent magnet motor provided by the present application adopt the following technical solutions:

[0008] A permanent magnet motor rotor includes a rotor body. A rotating shaft is passed through the rotor body. A permanent magnet mounting groove for placing permanent magnets is formed on the rotor body. The permanent magnets are in interference fit with the two side surfaces and the bottom surface of the permanent magnet mounting groove, and there is a ventilation gap between the permanent magnets and the top surface of the permanent magnet mounting groove.

[0009] Preferably, wedge blocks are provided on both sides of the permanent magnet, wedge-shaped grooves are opened on both sides of the permanent magnet installation groove, and the permanent magnet and both sides of the permanent magnet installation groove are interference-fitted by the cooperation of the wedge blocks and the wedge-shaped grooves.

[0010] Preferably, both ends of the rotor body are provided with end pieces for limiting the position of the permanent magnets.

[0011] Preferably, rotor blades are provided on the end pieces.

[0012] Preferably, bearings are provided at both ends of the rotating shaft.

[0013] A permanent magnet motor comprises a base, a shell and a permanent magnet motor rotor as described above, wherein the shell is located on the base, a front end cover is provided at the front end of the shell, an air suction port for air suction is circumferentially provided on the front end cover, and the diameter of the air suction port is in an inwardly tightened shape.

[0014] Preferably, a stator core is provided in the housing, the stator core is located outside the rotor body, and a stator winding is provided between the stator core and the rotor body.

[0015] Preferably, a rear end cover is provided at the rear end of the shell, and brackets are provided on the front end cover and the rear end cover, and the bearing is located in the bracket.

[0016] Preferably, a heat dissipation fan is provided on the rotating shaft, and a wind shield for protecting the heat dissipation fan is provided on the rear end cover.

[0017] In summary, compared with the related art, the utility model has the following beneficial effects:

[0018] 1. A permanent magnet mounting groove for placing a permanent magnet is provided on the rotor body, and the permanent magnet is interference-fitted with the two side surfaces and the bottom surface of the permanent magnet mounting groove, and there is a ventilation gap between the permanent magnet and the top surface of the permanent magnet mounting groove. Compared with the related art, the continuity of the magnetic circuit can be ensured and the magnetic flux density can be improved. The mechanical stress is transmitted through a sufficient contact surface to ensure the stability of the permanent magnet installation. There is a ventilation gap between the permanent magnet and the top surface of the permanent magnet mounting groove, which is not in direct contact with the permanent magnet, forming an air channel, which is beneficial to improving the heat dissipation performance of the permanent magnet motor, allowing the airflow to pass through the ventilation gap to take away the heat generated by the permanent magnet and the rotor body, and avoiding the demagnetization caused by overheating of the permanent magnet;

[0019] 2. By circumferentially arranging air suction openings on the front end cover of the permanent magnet motor, and the caliber of the air suction openings is in a shape of being tightened inward. Compared with the related technology, when the air flow passes through the gradually narrowing air suction openings, the speed increases, and the external fresh air can be more effectively sucked into the permanent magnet motor, thereby enhancing the cooling effect. At the same time, the inward-tightened air suction openings can serve as a preliminary filter to block larger particles of dust and foreign objects from entering the permanent magnet motor, protecting the permanent magnet motor from pollution and wear and extending the service life of the permanent magnet motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall side-sectional structure schematic diagram of the application embodiment;

[0021] Figure 2 is the overall structure schematic diagram of the application embodiment;

[0022] Figure 3 is the overall structure schematic diagram of the rotor of the application embodiment;

[0023] Figure 4 is the structure schematic diagram of the rotor of the application embodiment;

[0024] Figure 5 is the side view structure schematic diagram of the rotor of the application embodiment;

[0025] Figure 6 is the structure schematic diagram of the air suction opening of the application embodiment.

[0026] DESCRIPTION OF THE REFERENCE NUMERALS: 1. Machine base; 2. Outer shell; 3. Wind hood; 4. Front end cover; 5. Air suction opening; 6. Rotating shaft; 7. Rotor body; 8. Permanent magnet installation groove; 9. Permanent magnet; 10. Bearing; 11. End piece; 12. Rotor blade; 13. Bracket; 14. Stator core; 15. Stator winding; 16. Rear end cover; 17. Cooling fan. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following further describes the present application in detail Figure 1-6 with reference to the attached drawings.

[0028] The embodiment of the present application discloses a permanent magnet motor rotor and a permanent magnet motor. Referring to Figure 1-6 , a permanent magnet motor rotor includes a rotor body 7, a rotating shaft 6 is arranged through the rotor body 7, a permanent magnet installation groove 8 for placing a permanent magnet 9 is formed on the rotor body 7, the permanent magnet 9 is in interference fit with the two side surfaces and the bottom surface of the permanent magnet installation groove 8, and there is a ventilation gap between the permanent magnet 9 and the top surface of the permanent magnet installation groove 8;

[0029] It should be noted that the permanent magnet 9 is usually made of high-performance rare earth magnetic materials such as neodymium iron boron or samarium cobalt, and the rotor body 7 is usually formed by laminating multiple silicon steel sheets, which can reduce eddy current loss and hysteresis loss and improve the efficiency of the permanent magnet motor;

[0030] By adopting the above technical solution, the permanent magnet 9 is installed on the rotor body 7 by interference fit with the two side surfaces and the bottom surface of the permanent magnet mounting groove 8, and is used to generate a constant magnetic field. While the rotor body 7 provides mechanical support for the permanent magnet 9, it also participates in forming a magnetic circuit to help guide and concentrate the magnetic field. There is a ventilation gap between the top surface of the permanent magnet 9 and the permanent magnet mounting groove 8, and it does not directly contact the permanent magnet, forming an air channel, which is beneficial to improving the heat dissipation performance of the permanent magnet motor. The rotating shaft 6 is a key mechanical component connecting the rotor body 7 and the external load of the permanent magnet motor, and the torque generated by the permanent magnet motor is transmitted through the rotating shaft 6;

[0031] Refer to Figure 4 , wedges are provided on both sides of the permanent magnet 9, and wedge-shaped grooves are provided on both sides of the permanent magnet mounting groove 8. The permanent magnet 9 and the two sides of the permanent magnet mounting groove 8 are interference-fitted through the cooperation of the wedges and the wedge-shaped grooves;

[0032] By adopting the above technical solution, through the cooperation of the provided wedges and wedge-shaped grooves, the contact area between the permanent magnet 9 and the permanent magnet mounting groove 8 is increased, ensuring that the permanent magnet 9 remains stable under high-speed rotation and dynamic load changes and is not easily loosened or detached.

[0033] Refer to Figure 1 , end plates 11 for limiting the permanent magnet 9 are provided at both ends of the rotor body 7;

[0034] It should be noted that a plurality of ventilation through holes (not shown in the figure) are provided on the end plate 11;

[0035] By adopting the above technical solution, the end plates 11 are fixed at both ends of the rotor body 7, maintaining the installation stability of the permanent magnet 9 without affecting the ventilation of the ventilation gap between the permanent magnet 9 and the permanent magnet mounting groove 8.

[0036] Refer to Figure 3 , rotor blades 12 are provided on the end plate 11;

[0037] By adopting the above technical solution, the rotor blades 12 are driven to rotate by the centrifugal force generated during the operation of the permanent magnet motor, which can enhance the air flow circulation inside the permanent magnet motor and improve the cooling efficiency.

[0038] Refer to Figure 3 , bearings 10 are sleeved at both ends of the rotating shaft 6;

[0039] By adopting the above technical solution, the bearings 10 are installed at both ends of the rotating shaft 6 to support the rotor body 7 and allow it to rotate smoothly, while reducing friction and wear;

[0040] A permanent magnet motor comprises a base 1, a shell 2 and a permanent magnet motor rotor as described above, characterized in that the shell 2 is located on the base 1, a front end cover 4 is provided at the front end of the shell 2, an air suction port 5 for suctioning air is circumferentially provided on the front end cover 4, and the diameter of the air suction port 5 is inwardly tightened.

[0041] By adopting the above technical solution, when the air flow passes through the gradually shrinking air intake port 5, the speed increases, and the external fresh air can be more effectively sucked into the permanent magnet motor, thereby enhancing the cooling effect. At the same time, the internally tightened air intake port 5 can serve as a preliminary filter to block larger particles of dust and foreign matter from entering the permanent magnet motor, protect the permanent magnet motor from pollution and wear, and extend the service life of the permanent magnet motor. By evenly arranging the air intake port 5 circumferentially on the front end cover 4, the uniform distribution of the air flow inside the permanent magnet motor can be promoted, local overheating can be avoided, and the cooling efficiency and operating stability of the entire permanent magnet motor can be improved.

[0042] Reference Figure 1 A stator core 14 is fixed in the housing 2, and the stator core 14 is located outside the rotor body 7. A stator winding 15 is provided between the stator core 14 and the rotor body 7;

[0043] By adopting the above technical solution, the stator core 14 and the stator winding 15 are embedded to form a closed magnetic circuit, which guides and enhances the rotating magnetic field generated by the stator winding 15 being energized.

[0044] Reference Figure 1 The rear end of the housing 2 is provided with a rear end cover 16, and the front end cover 4 and the rear end cover 16 are both provided with a bracket 13, and the bearing 10 is located in the bracket 13;

[0045] By adopting the above technical solution, the front cover 4 and the rear cover 16 are used to protect the electrical components inside the permanent magnet motor from external physical damage, and the bracket 13 is used to fix the position of the support bearing 10 in the housing 2, which is beneficial to maintain the smooth rotation of the rotor body 7.

[0046] Reference Figure 1 , a cooling fan 17 is provided on the rotating shaft 6, and a wind shield 3 for protecting the cooling fan 17 is provided on the rear end cover 16;

[0047] By adopting the above technical solution, the heat dissipation fan 17 is used to dissipate heat when the permanent magnet motor is running, and the wind cover 3 can play a certain dust-proof role, and can also prevent external objects from being drawn into the permanent magnet motor.

[0048] The implementation principle of a permanent magnet motor rotor and a permanent magnet motor according to an embodiment of the present application is as follows: When in use, the permanent magnet 9 is fixed in the permanent magnet mounting groove 8 on the rotor body 7 to generate a constant magnetic field. The rotor body 7 participates in forming a magnetic circuit. The stator winding 15 is energized to generate a rotating magnetic field. The magnetic field generated by the permanent magnet 9 interacts with the rotating magnetic field to cause the rotor body 7 to rotate, converting electrical energy into mechanical energy and transmitting it through the rotating shaft 6. The centrifugal force generated when the rotor body 7 rotates causes the rotor blades 12 to rotate, allowing external air to enter the permanent magnet motor through the air inlet 5, enhancing the air flow circulation inside the permanent magnet motor. The air passes through the ventilation gap between the permanent magnet 9 and the permanent magnet mounting groove 8. When the rotor body 7 rotates, the cooling fan 17 also rotates, taking away the heat generated during the operation of the permanent magnet 9 and the rotor body 7, avoiding the demagnetization of the permanent magnet 9 caused by overheating, and extending the service life of the permanent magnet motor.

[0049] Finally, several points should be noted: First, in the description of the present application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense, which can be mechanical connection or electrical connection, or the communication inside two components, and can be directly connected. The terms "upper", "lower", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change;

[0050] Second: In the attached drawings of the disclosed embodiments of the present utility model, only the structures related to the disclosed embodiments are involved. Other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0051] Finally: The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

[0052] The above are all the preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A permanent magnet motor rotor, comprising a rotor body (7), characterized in that: A rotating shaft (6) is passed through the rotor body (7). A permanent magnet mounting groove (8) for placing a permanent magnet (9) is formed in the rotor body (7). The permanent magnet (9) is in interference fit with the two side surfaces and the bottom surface of the permanent magnet mounting groove (8), and there is a ventilation gap between the permanent magnet (9) and the top surface of the permanent magnet mounting groove (8).

2. A permanent magnet motor rotor according to claim 1, characterized in that: Wedges are provided on both sides of the permanent magnet (9). Wedge-shaped grooves are formed on both sides of the permanent magnet mounting groove (8). The permanent magnet (9) and the two sides of the permanent magnet mounting groove (8) are in interference fit through the cooperation of the wedges and the wedge-shaped grooves.

3. A permanent magnet motor rotor according to claim 1, characterized in that: End plates (11) for limiting the permanent magnet (9) are provided at both ends of the rotor body (7).

4. A permanent magnet motor rotor according to claim 3, characterized in that: Rotor blades (12) are provided on the end plates (11).

5. A permanent magnet motor rotor according to claim 1, characterized in that: Bearings (10) are sleeved at both ends of the rotating shaft (6).

6. A permanent magnet motor, comprising a machine base (1), a housing (2), and a permanent magnet motor rotor as described in any one of claims 1-5, characterized in that: The housing (2) is located on the machine base (1). A front end cover (4) is provided at the front end of the housing (2). An air suction port (5) for sucking air is circumferentially provided on the front end cover (4), and the diameter of the air suction port (5) is in a shape of narrowing inward.

7. A permanent magnet motor according to claim 6, characterized in that: A stator core (14) is provided inside the housing (2). The stator core (14) is located outside the rotor body (7). A stator winding (15) is provided between the stator core (14) and the rotor body (7).

8. A permanent magnet motor according to claim 6, characterized in that: A rear end cover (16) is provided at the rear end of the housing (2). Brackets (13) are provided on both the front end cover (4) and the rear end cover (16), and the bearings (10) are located inside the brackets (13).

9. A permanent magnet motor according to claim 6, wherein: A cooling fan (17) is provided on the rotating shaft (6). A wind shield (3) for protecting the cooling fan (17) is provided on the rear end cover (16).

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