Compact internal rotor and its motor

Abstract

This utility model discloses a compact internal rotor and its motor, comprising: a central shaft, a rotor assembly, and a fixing assembly. Two positioning slots are provided on the central shaft. The rotor assembly is sleeved on the central shaft and located between the two positioning slots. The fixing assembly includes an adjusting shim and two shaft retaining rings. The two shaft retaining rings are respectively disposed on the two positioning slots and are used to clamp the rotor assembly onto the central shaft. The adjusting shim is disposed between one of the shaft retaining rings and the central shaft. This utility model, by providing positioning slots on the central shaft, allows for the positioning and installation of the shaft retaining rings. Installing the shaft retaining rings first defines the axial position of the rotor core, eliminating the need to consider rotor end plate positioning during assembly, simplifying the assembly process. When the motor is operating, the positioning slots and shaft retaining rings act as limiters, preventing axial movement of the rotor core, thus ensuring a reliable structure.

Description

Technical Field

[0001] This utility model relates to the field of motor structure, and in particular to a compact internal rotor and its motor. Background Technology

[0002] Internal rotor motors are commonly used in electric vehicles, drones, and model aircraft. In electric vehicles, internal rotor motors are used in drive systems (such as drive motors in early models) due to their small size, light weight, and high efficiency. In drones and model aircraft, internal rotor motors, combined with propellers, have become the mainstream power choice due to their high speed (up to tens of thousands of revolutions per minute) and lightweight advantages.

[0003] However, the main components of the rotor in current commercially available internal rotor motors generally include the iron core, shaft, magnets, and rotor end plates. The assembly process involves numerous steps, and the manufacturing costs of the parts and processes are high. Therefore, designing an internal rotor motor structure that is end plate-free, has a simple assembly process, and a simple structure is a problem that those skilled in the art need to consider. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a compact internal rotor and its motor.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A compact internal rotor includes: a central shaft, a rotor assembly, and a fixing assembly.

[0007] Two positioning slots are provided on the central shaft;

[0008] The rotor assembly is sleeved on the central shaft and located between the two positioning slots; the fixing assembly includes an adjusting shim and two shaft retaining rings, the two shaft retaining rings are respectively disposed on the two positioning slots, and the two shaft retaining rings are used to clamp the rotor assembly on the central shaft, and the adjusting shim is disposed between one of the shaft retaining rings and the central shaft.

[0009] Preferably, the rotor assembly includes a rotor core and a plurality of magnetic tiles, the rotor core being sleeved on the central shaft, and each of the magnetic tiles being mounted on the rotor core.

[0010] Preferably, the rotor core has a plurality of fixing slots, and each magnetic tile is installed in a fixing slot in a corresponding manner.

[0011] Preferably, a first keyway is provided on the rotor mounting area of ​​the central shaft, and a second keyway is provided on the rotor core. The first keyway and the second keyway together form a flat key mounting area. A flat key structure is provided on the flat key mounting area to prevent relative rotation between the rotor core and the central shaft.

[0012] Preferably, a spiral adhesive groove is provided on the rotor mounting area of ​​the central shaft. The spiral adhesive groove is used to place adhesive, which is used to bond with the rotor core and prevent relative rotation between the rotor core and the central shaft.

[0013] Preferably, the rotor core has retaining ring grooves on its upper and lower end faces, and the two shaft retaining rings are respectively installed in the retaining ring grooves.

[0014] Preferably, the shaft retaining ring includes an annular portion and a protruding portion, wherein the protruding portion is disposed on the annular portion.

[0015] Preferably, the annular portion and the protrusion portion are integrally formed.

[0016] Preferably, the rotor core has a hollow structure in the middle, which is used to fill the balancing putty.

[0017] An electric motor comprising a compact internal rotor as described above.

[0018] The advantages and beneficial effects of this utility model compared to the prior art are as follows:

[0019] This utility model relates to a compact internal rotor and its motor. By setting a positioning groove on the central shaft, the shaft retaining ring can be positioned and installed. Installing the shaft retaining ring first can limit the axial position of the rotor core. During assembly, there is no need to consider the positioning of the rotor end plate, making the assembly process simple and easy to operate. When the motor is working, the positioning groove and the shaft retaining ring play a limiting role, preventing the rotor core from moving axially, thus ensuring a reliable structure. In addition, the central shaft and the rotor core are equipped with keyways, and the central shaft is also equipped with a spiral rubber groove to prevent the rotor core from rotating relative to the central shaft, resulting in high rotor reliability. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a compact internal rotor according to one embodiment of the present invention;

[0021] Figure 2 for Figure 1 The exploded view of the motor structure shown is shown below.

[0022] Figure 3 for Figure 1 The image shows an internal sectional view of the motor.

[0023] Figure 4for Figure 1 The diagram shows the structure of the central shaft of the motor. Detailed Implementation

[0024] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0025] Please see Figures 1-4 A compact internal rotor includes: a central shaft 100, a rotor assembly 200, and a fixing assembly 300, wherein the central shaft 100 has two positioning grooves 110.

[0026] The rotor assembly is sleeved on the central shaft and located between the two positioning slots. The fixing assembly 300 includes an adjusting shim 310 and two shaft retaining rings 320. The two shaft retaining rings are respectively disposed on the two positioning slots and are used to clamp the rotor assembly onto the central shaft. The adjusting shim is disposed between one of the shaft retaining rings and the central shaft. Specifically, the adjusting shim can be disposed between the shaft retaining rings at the front end of the rotor assembly or between the shaft retaining rings at the rear end of the rotor assembly. By clamping the rotor assembly onto the two positioning slots using the two shaft retaining rings, the end plates are reduced, making the assembly process simple and easy to operate, reducing the number of motor parts, and lowering the cost of the motor.

[0027] It should be noted that the rotor of this utility model does not have a rotor end plate and consists of a central shaft, a shaft retaining ring, and adjusting shims. Thus, by setting a positioning groove on the central shaft, the shaft retaining ring can be positioned and installed. Installing the shaft retaining ring first limits the axial position of the rotor core, eliminating the need to consider the rotor end plate positioning during assembly, making the assembly process simple and easy to operate. When the motor is working, the positioning groove and the shaft retaining ring act as a limit, preventing the rotor core from moving axially, ensuring a reliable structure.

[0028] Please see Figure 2 The rotor assembly 200 includes a rotor core 210 and a plurality of magnetic tiles 220. The rotor core is sleeved on the central shaft, and each magnetic tile is mounted on the rotor core. The rotor core has a plurality of fixing slots, and each magnetic tile is installed in one of the fixing slots. Thus, the rotor core, through its stable connection with the central shaft, provides a reliable support platform for the magnetic tiles; the magnetic tiles, installed in the fixing slots of the rotor core, form a stable magnetic field, which interacts with the stator magnetic field to generate torque, driving the rotor to rotate.

[0029] Please see Figure 3 The rotor mounting area of ​​the central shaft is provided with a first keyway 120, and the rotor core is provided with a second keyway 211. The first keyway and the second keyway together form a flat key mounting area, on which a flat key structure 400 is provided. The flat key structure is used to prevent relative rotation between the rotor core and the central shaft. Thus, by providing the first and second keyways, the central shaft and rotor core are keyed together, and the central shaft also has a spiral groove, preventing relative rotation between the rotor core and the central shaft, resulting in high rotor reliability.

[0030] Please see Figure 3 A spiral adhesive groove 130 is provided on the rotor mounting area of ​​the central shaft. The spiral adhesive groove is used to hold adhesive, which is used to bond the rotor core and prevent relative rotation between the rotor core and the central shaft. In this way, by providing the spiral adhesive groove 130, the rotor core can be fixed and its relative rotation can be prevented.

[0031] Please see Figure 4 The rotor core 210 has retaining ring grooves 212 on its upper and lower end faces, and two shaft retaining rings are respectively installed in the retaining ring grooves. Further, the shaft retaining ring 320 includes an annular portion 321 and a protruding portion 322, with the protruding portion disposed on the annular portion. In this embodiment, the annular portion and the protruding portion are integrally formed. It should be noted that the retaining ring groove 212 provides installation and positioning space for the shaft retaining ring 320, ensuring that the shaft retaining ring can be tightly and securely embedded therein. After the shaft retaining rings 320 are respectively installed in the retaining ring grooves, a tight mechanical connection is formed between them. This connection method can effectively limit the axial displacement of the rotor core on the central shaft. The annular portion 321 is the main body of the shaft retaining ring; its inner diameter matches the outer diameter of the central shaft, allowing it to be tightly fitted onto the central shaft, providing a stable support foundation for the entire shaft retaining ring. The raised portion increases the friction and engagement force between the shaft retaining ring and the retaining ring groove, making the retaining ring more secure and less prone to loosening. Simultaneously, the raised portion also serves a positioning function, ensuring the shaft retaining ring accurately embeds into the designated position within the retaining ring groove during installation, further improving installation precision and reliability. The one-piece molded structure design eliminates any gaps between the annular portion and the raised portion, enhancing the overall strength and stability of the shaft retaining ring and preventing performance degradation or malfunctions caused by loosening of the connection points.

[0032] It should be noted that the rotor core has a hollow structure in the middle, which is used to fill the balancing putty. After curing, the balancing putty will bond tightly with the rotor core, forming a stable mass block that maintains the rotor's balance over a long period. The balancing putty can be precisely filled into the hollow structure of the rotor core according to the rotor's imbalance, changing the rotor's mass distribution so that the rotor's center of mass coincides with the center of rotation, thereby eliminating or reducing the rotor's unbalanced torque and reducing vibration and noise.

[0033] An electric motor comprising a compact internal rotor as described above.

[0034] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A compact internal rotor, characterized in that, include: A central shaft, on which two positioning grooves are formed; A rotor assembly, which is sleeved on the central shaft and located between the two positioning slots; and The fixing assembly includes an adjusting shim and two shaft retaining rings. The two shaft retaining rings are respectively disposed on the two positioning grooves and are used to clamp the rotor assembly on the central shaft. The adjusting shim is disposed between one of the shaft retaining rings and the central shaft.

2. The compact internal rotor according to claim 1, characterized in that, The rotor assembly includes a rotor core and several magnetic tiles. The rotor core is sleeved on the central shaft, and each of the magnetic tiles is mounted on the rotor core.

3. The compact internal rotor according to claim 2, characterized in that, The rotor core has several fixed slots, and each magnetic tile is installed in a fixed slot in a corresponding manner.

4. The compact internal rotor according to claim 2, characterized in that, A first keyway is provided on the rotor mounting area of ​​the central shaft, and a second keyway is provided on the rotor core. The first keyway and the second keyway together form a flat key mounting area. A flat key structure is provided on the flat key mounting area to prevent relative rotation between the rotor core and the central shaft.

5. The compact internal rotor according to claim 4, characterized in that, A spiral adhesive groove is provided on the rotor mounting area of ​​the central shaft. The spiral adhesive groove is used to place adhesive, which is used to bond with the rotor core and prevent the rotor core from rotating relative to the central shaft.

6. The compact internal rotor according to claim 2, characterized in that, The rotor core has retaining ring grooves on its upper and lower end faces, and the two shaft retaining rings are respectively installed in the retaining ring grooves.

7. The compact internal rotor according to any one of claims 1 to 6, characterized in that, The shaft retaining ring includes an annular portion and a protruding portion, with the protruding portion disposed on the annular portion.

8. The compact internal rotor according to claim 7, characterized in that, The annular portion and the protruding portion are integrally formed structures.

9. The compact internal rotor according to claim 2, characterized in that, The rotor core has a hollow structure in the middle, which is used to fill the balancing mortar.

10. An electric motor, characterized in that, Including the compact internal rotor as described in any one of claims 1 to 8.

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