Permanent magnetization rotor structure for an asynchronous motor

Abstract

The utility model discloses an asynchronous motor permanent magnetization rotor structure, including rotor body, the rotor body includes the core and the rotating shaft, the core fixed mounting is in the outside of rotating shaft, the inside fixed mounting of core has the inner column, both ends of inner column all are through the core, the inner column is provided with a plurality of, a plurality of inner column annular interval arrangement and located the outside of rotating shaft, the inner column sets up as die casting aluminium column body, the outside of inner column is provided with long recess, long recess is provided with a plurality of, a plurality of long recess annular interval arrangement, the outside end face of core is provided with the magnetic slot, and the magnetic slot is provided with a plurality of, a plurality of magnetic slot annular interval arrangement. Its realized the ability of internal temperature to the export, increased practicality, thereby solved in the rotor operation process, the inconvenience of internal temperature to the export, the problem of poor practicality.

Description

Technical Field

[0001] This utility model relates to the field of rotor technology, specifically to a permanent magnet rotor structure for an asynchronous motor. Background Technology

[0002] The rotor of an asynchronous motor is its key rotating component. When it is working, the rotating magnetic field of the stator cuts the rotor winding, inducing electromotive force and current in the rotor, which in turn generates electromagnetic torque to drive the rotor to rotate. It is widely used in industrial drives, household appliances and other fields. For example, the patent with announcement number CN209982296U (a structure of an asynchronous motor rotor) includes an iron core, as well as an external magnet and a surface magnet disposed on the iron core; the iron core is manufactured by casting, and the external magnetic grooves on the iron core are manufactured by milling. While the aforementioned existing technologies can improve operational reliability, they lack internal heat-conducting structures, making it difficult to dissipate internal heat during rotor operation, thus reducing their practicality. Therefore, there is an urgent market need to develop a permanent magnet rotor structure for asynchronous motors to help solve these existing problems. Utility Model Content

[0003] The purpose of this invention is to provide a permanent magnet rotor structure for an asynchronous motor, so as to solve the problem mentioned in the background art that it is not convenient to dissipate the internal temperature during rotor operation, resulting in poor practicality.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a permanent magnet rotor structure for an asynchronous motor, comprising a rotor body, the rotor body comprising an iron core and a rotating shaft, the iron core being fixedly installed on the outside of the rotating shaft, an inner column being fixedly installed inside the iron core, both ends of the inner column penetrating the iron core, multiple inner columns being provided, the multiple inner columns being arranged in a ring at intervals and located on the outside of the rotating shaft, the inner column being a die-cast aluminum column.

[0005] Preferably, the outer side of the inner column is provided with a long groove, and there are multiple long grooves arranged in a ring at intervals.

[0006] Preferably, the outer end face of the iron core is provided with magnetic grooves, and multiple magnetic grooves are provided, which are arranged in a ring at intervals.

[0007] Preferably, the magnetic grooves are inclined, and each magnetic groove contains three permanent magnets arranged at intervals.

[0008] Preferably, guide bars are symmetrically arranged inside the magnetic groove along both sides of the permanent magnet, and conductive disks are symmetrically arranged on both sides of the iron core, with the two ends of the guide bars being fixedly connected to the two conductive disks respectively.

[0009] Preferably, an air groove is provided inside the iron core between two adjacent permanent magnets, and a cover is provided on the outside of the air groove, and the cover is fixedly connected to the iron core.

[0010] Preferably, a protective cylinder is provided on the outer side of the iron core, and an outer ring groove is provided on the outer side of the protective cylinder, and multiple outer ring grooves are provided.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model uses multiple die-cast aluminum pillars as inner pillars in the rotor body, with the two ends of the inner pillars penetrating the iron core and arranged in a ring at intervals on the outside of the rotating shaft. This facilitates the outward dissipation of internal temperature during rotor operation, enhances the thermal conductivity of the rotor structure, and enables more efficient dissipation of internally generated heat during operation, thereby effectively improving the reliability of rotor operation and increasing its practicality.

[0012] 2. By setting multiple magnetic slots and placing permanent magnets in each slot, this utility model can generate a stronger and more stable magnetic field, provide more sufficient magnetic flux, enhance the torque output capability of the motor, realize the permanent magnet rotor structure of the asynchronous motor, and increase its practicality.

[0013] 3. This utility model creates an effective magnetic barrier by setting an air groove between two adjacent permanent magnets inside the iron core, which effectively reduces the leakage flux of the rotor, improves the utilization rate and efficiency of the permanent magnets, and increases its practicality. Attached Figure Description

[0014] Figure 1 This is a front view of a permanent magnet rotor structure for an asynchronous motor according to this utility model; Figure 2 This is a schematic diagram of the internal structure of the protective cylinder of this utility model; Figure 3 This is a side sectional view of the iron core of this utility model; Figure 4 This is an enlarged schematic diagram of part A of this utility model.

[0015] In the diagram: 1. Rotor body; 101. Iron core; 1011. Air groove; 102. Shaft; 2. Protective cylinder; 201. Outer ring groove; 3. Inner column; 301. Long groove; 4. Permanent magnet; 5. Conductor bar; 6. Conductive disk; 7. Cover. Detailed Implementation

[0016] 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.

[0017] Please see Figure 1-4 The present invention provides an embodiment of a permanent magnet rotor structure for an asynchronous motor, comprising a rotor body 1, wherein the rotor body 1 is configured as the rotor of the asynchronous motor, the rotor body 1 includes an iron core 101 and a rotating shaft 102, the iron core 101 is fixedly installed on the outside of the rotating shaft 102, and an inner column 3 is fixedly installed inside the iron core 101, both ends of the inner column 3 penetrate the iron core 101, and multiple inner columns 3 are provided, the multiple inner columns 3 are arranged in a ring at intervals and located on the outside of the rotating shaft 102, and the inner column 3 is configured as a die-cast aluminum column.

[0018] The die-cast aluminum inner column 3 itself has good thermal conductivity, which can effectively conduct the heat generated inside to the outside during rotor operation, significantly improving the rotor's heat dissipation capacity, thereby avoiding the impact of excessive temperature rise on motor performance and lifespan, and greatly improving the practicality and durability of asynchronous motors.

[0019] Furthermore, the outer side of the inner column 3 is provided with a long groove 301, and multiple long grooves 301 are provided, arranged in a ring at intervals.

[0020] The long grooves 301 provided on the outer side of the inner column 3 increase the surface area of ​​the inner column 3. According to the principle of heat transfer, the larger the surface area of ​​an object, the stronger its ability to exchange heat with the surrounding environment. Thus, these long grooves 301 can further enhance the heat dissipation effect of the inner column 3, allowing the heat absorbed by the inner column 3 to be dissipated into the surrounding air more quickly. Moreover, the multiple long grooves 301 are arranged in a ring at intervals, which can promote the dissipation of heat from multiple directions, avoid the accumulation of heat in certain areas, ensure the uniformity of the temperature of the inner column 3, help maintain the stability of rotor operation, and improve the reliability of the motor during long-term operation.

[0021] Furthermore, a magnetic groove is provided on the outer end face of the iron core 101, and multiple magnetic grooves are provided. The multiple magnetic grooves are arranged in a ring with intervals and are inclined. Each magnetic groove contains three permanent magnets 4, which are arranged at intervals.

[0022] Multiple magnetic slots arranged in a ring provide a stable mounting position for the permanent magnets 4, ensuring the reliability of the permanent magnets 4 fixed on the rotor. Compared with vertical or horizontal settings, the inclined magnetic slots can change the distribution direction of the magnetic field, making the magnetic field more rationally distributed in space, thereby optimizing the electromagnetic performance of the motor. The three permanent magnets 4 arranged at intervals in each magnetic slot can generate a stronger and more stable magnetic field, providing more sufficient magnetic flux, enhancing the torque output capability of the motor, and improving the power density of the motor.

[0023] Furthermore, guide bars 5 are symmetrically arranged on both sides of the permanent magnet 4 inside the magnetic groove, and conductive disks 6 are symmetrically arranged on both sides of the iron core 101. The two ends of the guide bars 5 are fixedly connected to the two conductive disks 6 respectively.

[0024] The guide bars 5 symmetrically arranged on both sides of the permanent magnet 4 inside the magnetic groove and the conductive disks 6 fixedly connected to both ends of the guide bars 5 form an effective conductive path, which is beneficial to improving the stability and reliability of motor operation.

[0025] Furthermore, an air groove 1011 is provided inside the iron core 101 between two adjacent permanent magnets 4, and a cover 7 is provided on the outside of the air groove 1011, and the cover 7 is fixedly connected to the iron core 101.

[0026] The magnetic resistance of air is much higher than that of the iron core. These air grooves 1011 form an effective magnetic barrier, forcing the main magnetic flux to pass along a preset ideal path, effectively reducing the leakage flux of the rotor, thereby improving the utilization rate and efficiency of the permanent magnet. At the same time, it can also help block the path of eddy currents in the iron core, reduce eddy current losses, and reduce heat generation. The outer cover 7 is fixedly connected to the iron core 101, which not only prevents external debris from entering the air grooves 1011, ensuring the cleanliness and heat insulation effect inside the air grooves 1011, but also plays a certain role in structural reinforcement, enhancing the overall strength of the iron core 101 and improving the stability of the rotor when rotating at high speed.

[0027] Furthermore, a protective cylinder 2 is provided on the outer side of the iron core 101, and an outer ring groove 201 is provided on the outer side of the protective cylinder 2, and multiple outer ring grooves 201 are provided.

[0028] During motor operation, the protective sleeve 2 can prevent external dust, moisture and other substances from damaging the iron core 101, thus extending the service life of the iron core 101. The multiple outer ring grooves 201 provided on the outer side of the protective sleeve 2 increase the surface area of ​​the protective sleeve 2, which helps heat dissipation and increases its practicality.

[0029] Working principle: During use, the inner column 3 of the die-cast aluminum column inside the asynchronous motor rotor conducts the heat generated during operation outward due to its good thermal conductivity. The multiple long grooves 301 arranged in a ring on its outer side increase the surface area and enhance the heat dissipation effect. The inclined magnetic grooves arranged in a ring on the outer end face of the iron core 101 provide installation positions for the permanent magnets 4. The three permanent magnets 4 arranged in a ring in the magnetic groove generate a strong and stable magnetic field, which enhances the torque output and increases the power density. The symmetrical guide bars 5 and conductive disks 6 on both sides of the permanent magnets 4 in the magnetic groove form a conductive path, which improves the stability of operation. The air grooves 1011 between adjacent permanent magnets 4 in the iron core 101 form a magnetic barrier, which reduces leakage flux, reduces eddy current loss and heat generation. The outer cover 7 prevents foreign objects from entering, strengthens the structure, and enhances the stability of high-speed rotation. In addition, the protective cylinder 2 on the outside of the iron core 101 prevents external dust and moisture from damaging the iron core 101. The multiple outer ring grooves 201 on its outer side increase the surface area, which helps heat dissipation and increases practicality.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A permanent magnet rotor structure for an asynchronous motor, comprising a rotor body (1), characterized in that: The rotor body (1) includes an iron core (101) and a rotating shaft (102). The iron core (101) is fixedly installed on the outside of the rotating shaft (102). An inner column (3) is fixedly installed inside the iron core (101). Both ends of the inner column (3) penetrate the iron core (101). Multiple inner columns (3) are provided. The multiple inner columns (3) are arranged in a ring at intervals and located on the outside of the rotating shaft (102). The inner column (3) is set as a die-cast aluminum column.

2. The permanent magnet rotor structure for an asynchronous motor according to claim 1, characterized in that: The inner column (3) is provided with a long groove (301) on its outer side. There are multiple long grooves (301) arranged in a ring at intervals.

3. The permanent magnet rotor structure for an asynchronous motor according to claim 1, characterized in that: The outer end face of the iron core (101) is provided with a magnetic groove, and there are multiple magnetic grooves arranged in a ring at intervals.

4. The permanent magnet rotor structure for an asynchronous motor according to claim 3, characterized in that: The magnetic grooves are inclined, and each magnetic groove contains three permanent magnets (4), which are arranged at intervals.

5. The permanent magnet rotor structure for an asynchronous motor according to claim 4, characterized in that: Inside the magnetic groove, guide bars (5) are symmetrically arranged on both sides of the permanent magnet (4), and conductive disks (6) are symmetrically arranged on both sides of the iron core (101). The two ends of the guide bars (5) are fixedly connected to the two conductive disks (6).

6. The permanent magnet rotor structure for an asynchronous motor according to claim 5, characterized in that: An air groove (1011) is provided inside the iron core (101) between two adjacent permanent magnets (4), and a cover (7) is provided on the outside of the air groove (1011), and the cover (7) is fixedly connected to the iron core (101).

7. The permanent magnet rotor structure for an asynchronous motor according to claim 1, characterized in that: The outer side of the iron core (101) is provided with a protective cylinder (2), and the outer side of the protective cylinder (2) is provided with an outer ring groove (201), and there are multiple outer ring grooves (201).

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