Rotor magnetic steel fixing structure of surface-mounted permanent magnet motor

Abstract

The rotor magnetic steel fixing structure comprises a main shaft, a rotor sleeve, a heat conduction plate, a plurality of magnetic steels and a check ring, the rotor sleeve and the main shaft are coaxially arranged, the heat conduction plate is arranged at openings in the two sides of the rotor sleeve in the radial direction, and the inner side and the outer side of the heat conduction plate are fixedly connected with the main shaft and the rotor sleeve respectively. The plurality of magnetic steels are axially arranged on the outer wall of the rotor sleeve in a surrounding manner, and the check rings are arranged at the end parts of the two sides of the rotor sleeve and fix the magnetic steels on the outer wall of the rotor sleeve. According to the utility model, the magnetic steel is fixed on the surface of the rotor sleeve through the retainer ring, and the retainer ring is connected with the rotor sleeve only by using a very small number of bolts, so that the magnetic steel can be fixed without using a binder, a positioning block and a large number of bolts, thereby not only ensuring the normal heat dissipation of the rotor sleeve and the magnetic steel, but also simplifying the assembly process of the motor; therefore, the production cost of the motor is reduced and the production efficiency of the motor is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a rotor magnet fixing structure for a surface-mounted permanent magnet motor. Background Technology

[0002] Surface-mounted permanent magnet motors are motors in which the permanent magnets are directly mounted on the surface of the rotor core. These motors have a relatively simple manufacturing process and lower cost.

[0003] There are generally two methods for mounting and fixing the permanent magnets to the rotor core in existing surface-mounted permanent magnet motors:

[0004] One method is adhesive bonding, such as the surface-mounted magnetic pole rotor of a permanent magnet motor disclosed in patent CN119675295A, where multiple permanent magnets are evenly bonded to the outer wall of the rotor support. However, this fixing method can easily lead to poor heat dissipation paths inside the rotor, which may cause the permanent magnets to demagnetize at high temperatures. Furthermore, the permanent magnets are affected by centrifugal force at high speeds, which may cause them to detach or shift, requiring additional reinforcement measures (such as carbon fiber sleeves), thereby increasing the cost and structural complexity of the motor.

[0005] Another method is bolt fixing, such as the surface-mount permanent magnet motor rotor magnet fixing structure disclosed in patent CN219086896U. The magnets are axially and radially limited by retaining rings and positioning blocks, but two bolts are required on each positioning block. Therefore, the number of positioning blocks and bolts used is extremely large. On the one hand, it will increase the overall weight and energy consumption of the motor, and on the other hand, it will make the motor assembly process more complicated, thus affecting the production efficiency of the motor.

[0006] In conclusion, the existing methods for installing and fixing the permanent magnets of surface-mounted permanent magnet motor rotors still need improvement. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model discloses a rotor magnet fixing structure for a surface-mount permanent magnet motor, including a main shaft, a rotor sleeve, a heat-conducting plate, multiple magnets, and retaining rings. The rotor sleeve is coaxially arranged with the main shaft. The heat-conducting plate is radially arranged at the openings on both sides of the rotor sleeve, and its inner and outer sides are fixedly connected to the main shaft and the rotor sleeve, respectively. The multiple magnets are axially arranged and surround the outer wall of the rotor sleeve. The retaining rings are arranged at both ends of the rotor sleeve and fix the magnets to the outer wall of the rotor sleeve.

[0008] Furthermore, the magnet has stepped recesses at both ends, the retaining ring has a right-angled cross-section, the right-angled arm on the upper side of the retaining ring is located in the recess, and the upper surface of the right-angled arm is flush with the upper surface of the magnet.

[0009] Furthermore, the right-angle arm on the side of the retaining ring is connected to the heat-conducting plate by bolts.

[0010] Furthermore, a buffer pad is provided between the right-angled arm on the upper side of the retaining ring and the recessed part of the magnet.

[0011] Furthermore, the outer wall of the rotor sleeve is provided with multiple partitions at equal intervals along the axial direction and in a circumferential manner, and a positioning groove is formed between two adjacent partitions, and the magnet is disposed in the positioning groove.

[0012] Furthermore, the rotor sleeve is provided with a plurality of first heat dissipation holes.

[0013] Furthermore, the heat-conducting plate is provided with several second heat dissipation holes.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention uses a retaining ring to fix the magnet to the surface of the rotor sleeve. Only a very small number of bolts are needed to connect the retaining ring to the rotor sleeve to fix the magnet. No adhesive is needed, nor are positioning blocks and a large number of bolts required. This ensures normal heat dissipation for the rotor sleeve and the magnet, and simplifies the motor assembly process. Therefore, it helps to reduce motor production costs and improve motor production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is an axial structural cross-sectional view of the present invention;

[0019] Figure 3 for Figure 2 Enlarged view of the local structure at point A;

[0020] Figure 4 This is a schematic diagram of the rotor sleeve in this utility model.

[0021] Figure label:

[0022] 1-Main shaft, 2-Rotor sleeve, 21-Baffle plate, 22-Positioning groove, 23-First heat dissipation hole, 3-Heat conduction plate, 31-Second heat dissipation hole, 4-Magnet, 5-Retaining ring, 6-Bolt, 7-Buffer pad. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0025] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0026] In the description of the embodiments, unless otherwise expressly specified and limited, the terms "set," "connect," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] like Figure 1-2 As shown, the rotor magnet fixing structure of the surface-mount permanent magnet motor in this embodiment includes a main shaft 1, a rotor sleeve 2, a heat-conducting plate 3, multiple magnets 4, and a retaining ring 5. The rotor sleeve 2 is coaxially arranged with the main shaft 1. The heat-conducting plate 3 is radially arranged at the openings on both sides of the rotor sleeve 2, and its inner and outer sides are fixedly connected to the main shaft 1 and the rotor sleeve 2, respectively. The multiple magnets 4 are axially arranged and arranged around the outer wall of the rotor sleeve 2. The retaining ring 5 is arranged at both ends of the rotor sleeve 2 and fixes the magnets 4 to the outer wall of the rotor sleeve 2.

[0028] The heat-conducting plate 3 and the main shaft 1 can be fixedly connected by means of thread, bolt or key connection, and limited by the shaft shoulder. The heat-conducting plate 3 is fixedly connected to both ends of the rotor sleeve 2 by the retaining ring 5 and the bolt 6.

[0029] The heat-conducting plate 3 is provided with several second heat dissipation holes 31 to dissipate the heat inside the rotor sleeve 2. The heat-conducting plate 3 can be made of copper plate or aluminum plate, which is beneficial to improving the overall heat dissipation effect of the rotor.

[0030] like Figure 3As shown, the magnet 4 has stepped recesses at both ends, the retaining ring 5 has a right-angled cross-section, the right-angled arm on the upper side of the retaining ring 5 is set in the recess, and the upper surface of the right-angled arm is flush with the upper surface of the magnet 4, so as to ensure that the outer side of the rotor is a relatively flat circumferential surface, so as not to affect the rotational fit with the stator.

[0031] The right-angle arm on the side of the retaining ring 5 is connected to the heat-conducting plate 3 by bolts 6. A buffer pad 7 is also provided between the right-angle arm on the upper side of the retaining ring 5 and the recess of the magnet 4. The buffer pad 7 can be made of flexible materials such as rubber or silicone. On the one hand, it plays a role in vibration reduction and noise reduction, and on the other hand, it can also play a role in adaptation. By utilizing its soft and deformable characteristics, it can reduce the processing error and fitting error between the retaining ring 5 and the magnet 4, thereby making the magnet 4 more firmly fixed.

[0032] like Figure 4 As shown, multiple partitions 21 are provided on the outer wall of the rotor sleeve 2 along the axial direction and at equal intervals in a circumferential manner. A positioning groove 22 is formed between two adjacent partitions 21, and the magnet 4 is placed in the positioning groove 22. The positioning groove 22 provides radial positioning for the magnet 4, and the retaining ring 5 provides axial positioning for the magnet 4.

[0033] The rotor sleeve 2 is provided with several first heat dissipation holes 23, which are used to dissipate the heat generated by the magnet 4 during operation to the inside of the rotor sleeve 2 and dissipate it through the second heat dissipation holes 31.

[0034] This invention uses a retaining ring 5 to fix the magnet 4 to the surface of the rotor sleeve 2. Only a very small number of bolts 6 are needed to connect the retaining ring 5 to the rotor sleeve 2 to fix the magnet 4. No adhesive is needed, nor are positioning blocks and a large number of bolts required. This ensures normal heat dissipation for the rotor sleeve 2 and the magnet 4, and simplifies the motor assembly process. Therefore, it helps to reduce the motor production cost and improve the motor production efficiency.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

Claims

1. A rotor magnet fixing structure for a surface-mounted permanent magnet motor, characterized in that: The device includes a main shaft, a rotor sleeve, a heat-conducting plate, multiple magnets, and retaining rings. The rotor sleeve is coaxially arranged with the main shaft. The heat-conducting plate is radially arranged at the openings on both sides of the rotor sleeve, and its inner and outer sides are fixedly connected to the main shaft and the rotor sleeve, respectively. The multiple magnets are axially arranged and surround the outer wall of the rotor sleeve. The retaining rings are arranged at both ends of the rotor sleeve and fix the magnets to the outer wall of the rotor sleeve.

2. The rotor-magnet fixing structure of the surface-mounted permanent-magnet motor according to claim 1, characterized in that: The magnet has stepped recesses at both ends, the retaining ring has a right-angled cross-section, the right-angled arm on the upper side of the retaining ring is set in the recess, and the upper surface of the right-angled arm is flush with the upper surface of the magnet.

3. The rotor magnet fixing structure of the surface-mounted permanent magnet motor according to claim 2, characterized in that: The right-angle arm on the side of the retaining ring is connected to the heat-conducting plate by bolts.

4. The rotor-magnet fixing structure of the surface-mounted permanent-magnet motor according to claim 2, characterized in that: A buffer pad is also provided between the right-angle arm on the upper side of the retaining ring and the recessed part of the magnet.

5. The rotor-magnet fixing structure of the surface-mounted permanent-magnet motor according to claim 1, characterized in that: The rotor sleeve has multiple partitions spaced equidistantly along the axial direction on its outer wall, with a positioning groove formed between two adjacent partitions, and the magnet is disposed in the positioning groove.

6. The rotor-magnet fixing structure of a surface-mounted permanent-magnet motor according to claim 1, characterized in that: The rotor sleeve is provided with several first heat dissipation holes.

7. The rotor-magnet fixing structure of a surface-mounted permanent-magnet motor according to claim 1, characterized in that: The heat-conducting plate is provided with several second heat dissipation holes.

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