High-efficiency rotor structure of motor

Abstract

The utility model belongs to the technical field of motor equipment, and relates to a high-efficiency rotor structure of a motor, which comprises a rotor inner core, a rotor inner core, a rotor outer core and a rotor inner core, the main shaft is rotationally arranged in an inner hole of the bearing seat; the rotor outer core is mounted on the circumferential surface of the rotor inner core and synchronously rotates along with the rotor inner core, a plurality of slots are uniformly distributed in the inner wall of the rotor outer core along the circumferential direction, and a permanent magnet is inserted into each slot; the rotor inner core is provided with a stepped hole. The structure not only has the characteristics of high mechanical strength, low electromagnetic noise, small cogging torque and high magnetic steel utilization rate of a traditional motor rotor, but also has the main advantages that the stepped hole processing of the rotor core is realized, the bearing chamber can penetrate into the inner hole of the rotor, the gravity center of the structure is deviated to the bearing seat, the bearing load is reduced, the overall structure is more reliable, and the service life is prolonged. In addition, the structure has the advantages of being easy to assemble, high in yield and low in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor equipment and relates to a high-efficiency rotor structure of a motor. Background Art

[0002] Among the various existing permanent magnet motors, the design and production of the rotor have a significant impact on the overall performance of the motor. Currently, most motor rotors use a structure where the rotor core is formed by laminating silicon steel sheets and the motor shaft has an interference fit. This structure has the following problems:

[0003] 1) Silicon steel has low iron loss and high magnetic induction, but it may be used in some motors due to performance redundancy. Furthermore, it is relatively expensive and has no cost advantage in mass production.

[0004] 2) The significant difference in elastic modulus between silicon steel and motor shaft materials results in a small design margin for interference fit. If the interference fit is too large, the silicon steel core may be squeezed and deformed during press-fit assembly, leading to scrap. Furthermore, the motor rotor core is typically formed by laminating multiple silicon steel sheets, which can also cause the silicon steel core to be squeezed and deformed during the lamination process. All of these factors contribute to a high scrap rate for silicon steel rotor cores, making them uneconomical.

[0005] 3) The rotor core is formed by laminating multiple silicon steel sheets. The roughness of the inner hole is difficult to control during the forming process. To ensure reliable fit between the shaft and the rotor core and high assembly efficiency, the dimensional tolerance and surface roughness requirements of the rotor inner hole need to be improved, which increases the processing cost.

[0006] 4) Rotor silicon steel sheets are automatically stamped and stacked during mass production, resulting in a single rotor bore diameter. This prevents step hole machining and limits the motor's structural layout. For example, in a single-bearing cantilever beam motor rotor, the motor's bearing chamber cannot penetrate deep into the rotor bore. This shifts the overall center of gravity and the bearing load direction, significantly reducing bearing life. Summary of the Invention

[0007] In response to the above-mentioned problems, the present utility model provides a high-efficiency motor rotor structure, which not only has the characteristics of high mechanical strength, low electromagnetic noise, small cogging torque and high magnetic steel utilization of traditional motor rotors, but also has the main advantage of realizing step hole processing of the rotor core, so that the bearing chamber can penetrate deep into the inner hole of the rotor, so that the center of gravity of the structure is biased toward the bearing seat, reducing the bearing load and making the overall structure more reliable. In addition, the structure also has the characteristics of simple assembly, high yield and low cost.

[0008] According to the technical solution of the utility model: a high-efficiency motor rotor structure, characterized by comprising:

[0009] The rotor core has a main shaft installed in its inner hole, and the rotation of the main shaft drives the rotor core to rotate synchronously;

[0010] a bearing seat, in which the main shaft is rotatably disposed an inner hole of the bearing seat;

[0011] The rotor outer core is mounted on the circumferential surface of the rotor inner core and rotates synchronously with the rotor inner core. The inner wall of the rotor outer core is evenly provided with a plurality of slots along the circumferential direction, and a permanent magnet is inserted into each of the slots.

[0012] The rotor inner core is configured with a stepped hole, and the bearing chamber of the bearing seat extends into the stepped hole.

[0013] As a further improvement of the present invention, the rotor outer core is interference fit on the circumferential surface of the rotor inner core.

[0014] As a further improvement of the present invention, the outer length of the rotor inner core is the same as the length of the rotor outer core.

[0015] As a further improvement of the present invention, a stepped hole is constructed at one axial end of the rotor inner core, and one axial end of the main shaft extends into the stepped hole and is rotatably supported on the bearing seat.

[0016] As a further improvement of the present invention, stepped holes are respectively constructed at both axial ends of the rotor inner core, and both ends of the main shaft extend into the corresponding stepped holes and are rotatably supported on corresponding bearing seats.

[0017] As a further improvement of the present invention, the rotor inner core is made of carbon steel.

[0018] As a further improvement of the present invention, the rotor outer core is made of silicon steel material.

[0019] The technical benefits of this utility model are as follows: 1) Existing motor rotor silicon steel sheets are automatically stamped and stacked during mass production, resulting in a single rotor inner hole diameter, making stepped hole processing impossible and limiting the motor's structural layout. This utility model's rotor core, consisting of an inner rotor core and an outer rotor core, allows for stepped inner holes in the rotor, optimizing the motor's layout.

[0020] 2) Existing motors generally use silicon steel as the material for the rotor core. This utility model's rotor core is divided into two parts: an inner rotor core and an outer rotor core. The outer rotor core is made of silicon steel, while the inner rotor core is made of carbon steel. Carbon steel is cheaper and more common than silicon steel, so this utility model saves silicon steel material and has a lower cost compared to traditional technologies.

[0021] 3) In existing motors, the silicon steel rotor core and the shaft typically have an interference fit. However, the elastic moduli of silicon steel and the shaft differ significantly. If the interference fit is too large, the silicon steel rotor core can be easily damaged during the press-fit process. This utility model employs an interference fit between the rotor outer core and the rotor inner core. The elastic moduli of carbon steel and silicon steel differ only slightly, minimizing the likelihood of deformation during press-fit assembly. This reduces assembly difficulty while improving the reliability of the motor rotor. Furthermore, compared to the traditional direct fit of the silicon steel core and shaft, the rotor inner core of this utility model fits directly onto the shaft; their elastic moduli are closer, making interference assembly easier and more efficient.

[0022] 4) Existing motor rotor cores typically use either pure silicon steel or pure carbon steel. The former easily leads to redundant motor performance and is wasteful due to its high price. The latter, however, increases iron loss in pure carbon steel rotors and significantly degrades the motor's electromagnetic performance. This new rotor core utilizes a hybrid structure of silicon steel and carbon steel, combining the advantages of both carbon steel and silicon steel cores. This reduces redundant motor performance while ensuring that motor performance remains within design requirements, further improving economic efficiency.

[0023] 5) Existing motor rotors impose high dimensional requirements on the motor shaft surface roughness and shaft diameter to ensure a reliable fit between the silicon steel rotor core and the motor shaft, increasing processing costs and difficulty. This utility model reduces the requirements for fit between the rotor core and the motor shaft, thereby appropriately lowering the tolerance requirements for motor shaft surface roughness and shaft diameter, reducing processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of the first embodiment of the present invention.

[0025] Figure 2 This is a schematic structural diagram of the second embodiment of the present invention. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts should fall within the scope of protection of the present invention.

[0028] Figure 1 、 2The rotor structure includes a main shaft 10, a bearing seat 20, a rotor inner core 30, a step hole 31, a permanent magnet 40, a rotor outer core 50, etc.

[0029] like Figure 1 、 2 As shown, the utility model is a high-efficiency rotor structure of a motor, including a rotor core 30, in which a main shaft 10 is installed in the inner hole of the rotor core 30, and the rotation of the main shaft 10 drives the rotor core 30 to rotate synchronously; in specific production practice, the rotor core 30 and the main shaft 10 are connected by interference fit.

[0030] The main shaft 10 is rotatably disposed in the inner hole of the bearing seat 20 .

[0031] The rotor outer core 50 is installed on the circumferential surface of the rotor inner core 30, and the rotor outer core 50 rotates synchronously with the rotor inner core 30. The inner wall of the rotor outer core 50 is evenly distributed along the circumferential direction. A permanent magnet 40 is inserted into each of the slots. The permanent magnet 40 is inserted into the slot and fixed with glue.

[0032] The rotor inner core 30 is configured with a stepped hole 31 into which the bearing chamber of the bearing seat 20 extends.

[0033] Furthermore, the rotor outer core 50 is interference-fitted to the circumferential surface of the rotor inner core 30 .

[0034] Furthermore, the outer length of the rotor inner core 30 is the same as the length of the rotor outer core 50 , achieving a shorter axial length and optimizing the motor layout.

[0035] like Figure 1 As shown, in the first embodiment of the present invention, a stepped hole 31 is constructed at one axial end of the rotor inner core 30 , and the main shaft 10 extends into the stepped hole 31 at one axial end and is rotatably supported by the bearing seat 20 .

[0036] like Figure 2 As shown, in the second embodiment of the present invention, stepped holes 31 are respectively constructed at both axial ends of the rotor inner core 30 , and both ends of the main shaft 10 extend into the corresponding stepped holes 31 and are respectively rotatably supported on the corresponding bearing seats 20 .

[0037] It is understood that in actual production practice, in order to ensure that the rotor inner core 30 and the rotor outer core 50 have sufficient strength to ensure long-term stable and reliable operation, the rotor inner core 30 is made of carbon steel and the rotor outer core 50 is made of silicon steel.

[0038] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A high-efficiency motor rotor structure, characterized in that: include: The rotor core has a main shaft installed in its inner hole, and the rotation of the main shaft drives the rotor core to rotate synchronously; a bearing seat, in which the main shaft is rotatably disposed an inner hole of the bearing seat; The rotor outer core is mounted on the circumferential surface of the rotor inner core and rotates synchronously with the rotor inner core. The inner wall of the rotor outer core is evenly provided with a plurality of slots along the circumferential direction, and a permanent magnet is inserted into each of the slots. The rotor inner core is configured with a stepped hole, and the bearing chamber of the bearing seat extends into the stepped hole.

2. The high-efficiency motor rotor structure according to claim 1, characterized in that: The rotor outer core is interference-fitted to the circumferential surface of the rotor inner core.

3. The high-efficiency motor rotor structure according to claim 1, wherein: The outer length of the rotor inner core is the same as the length of the rotor outer core.

4. The high-efficiency motor rotor structure according to claim 1, wherein: A step hole is formed at one axial end of the rotor inner core, and one axial end of the main shaft extends into the step hole and is rotatably supported on the bearing seat.

5. The high-efficiency motor rotor structure according to claim 1, characterized in that: The two axial ends of the rotor inner core are respectively formed with step holes, and the two ends of the main shaft respectively extend into the corresponding step holes and are respectively rotatably supported on the corresponding bearing seats.

6. The high-efficiency motor rotor structure according to claim 1, wherein: The rotor inner core is made of carbon steel.

7. The high-efficiency motor rotor structure according to claim 1, characterized in that: The rotor outer core is made of silicon steel material.

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