Permanent magnet synchronous motor rotor

Abstract

The utility model relates to the technical field of rotor end plates, and discloses a permanent magnet synchronous motor rotor which comprises a rotor core and magnetic steel installed on the rotor core, end plates are installed at the two ends of the rotor core, the end plates are pressed on a rotating shaft through inner hole embedded steel rings, centrifugal fan blade structures are designed on one sides of the end plates, and first threaded holes are formed in the tail ends of the end plates. The side face of the end plate is provided with a second threaded hole, the second threaded hole is in threaded connection with a balance weight screw, the front end of the balance weight screw is provided with an insertion hole, the balance weight screw penetrates through the insertion hole in the balance weight screw and extends to the outer side of the end plate, and one end of the balance weight screw is in threaded connection with a nut. In order to enhance the protection of the magnetic steel, the steel ring is embedded in the inner hole of the end plate and is fixed on the rotating shaft through a cold pressing process, so that the magnetic steel is effectively protected, the magnetic steel is prevented from shifting or falling off in high-speed rotation and high-temperature environments, and the service life of the magnetic steel is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of rotor end plates, and particularly to a permanent magnet synchronous motor rotor. Background Art

[0002] Permanent magnet synchronous motors have been widely used in modern industries and household appliances due to their advantages such as high efficiency, high power density, and high torque output. However, the traditional interior permanent magnet synchronous motor rotor has the following several significant technical problems: First, it is difficult to correct the dynamic balance of the rotor: The two ends of the rotor of a common interior permanent magnet synchronous motor are usually not equipped with end plates, resulting in the rotor being prone to imbalance during high-speed rotation. This imbalance will cause vibration and noise of the motor, and in severe cases, it will affect the running stability and lifespan of the motor. In traditional methods, correcting dynamic balance requires complex equipment and technology, increasing production costs and maintenance difficulties. Second, the heat dissipation problem of the magnetic steel: The rotor of a permanent magnet synchronous motor is equipped with magnetic steel, and these magnetic steels will generate a certain amount of heat during the operation of the motor. If the heat cannot be dissipated in time, the performance of the magnetic steel may decline, or even lead to the demagnetization of the magnetic steel, thereby affecting the efficiency and output performance of the motor. Traditional rotor designs often lack effective heat dissipation means, making it difficult to control the temperature of the magnetic steel. Third, insufficient protection of the magnetic steel: Under high-speed rotation and high-temperature environments, the magnetic steel on the rotor is easily affected by mechanical stress and temperature changes, and may shift or fall off. The lack of effective protection measures will affect the stability and service life of the magnetic steel.

[0003] In view of the above problems, it is necessary to design a permanent magnet synchronous motor rotor to achieve dynamic balance correction and heat dissipation protection of the magnetic steel through the design of the end plate. Summary of the Utility Model

[0004] The present utility model aims to solve at least one of the technical problems existing in the prior art. The purpose of the present utility model is to provide a permanent magnet synchronous motor rotor for solving the problems raised in the above background art.

[0005] In a first aspect, the present application provides a permanent magnet synchronous motor rotor, adopting the following technical solution:

[0006] A permanent magnet synchronous motor rotor includes a rotor core and magnetic steel installed on the rotor core. End plates are installed at both ends of the rotor core. The end plates are press-fitted on the rotating shaft through steel rings embedded in inner holes. A centrifugal fan blade structure is designed on one side of the end plate. A first threaded hole is opened at the tail end of the end plate, and a weight screw is threadedly connected to the first threaded hole. A second threaded hole is opened on the side surface of the end plate, and a counterweight screw is threadedly connected to the second threaded hole. A jack is opened at the front end of the weight screw, and the counterweight screw passes through the jack on the weight screw and extends to the outside of the end plate. A nut is threadedly connected to one end of the counterweight screw.

[0007] By adopting the above technical solutions, a steel ring is inlaid in the inner hole of the end plate, effectively protecting the permanent magnet, preventing it from shifting or falling off under high-speed rotation and high-temperature environments, and extending the service life of the permanent magnet. Secondly, one side of the end plate is designed as a centrifugal fan structure, which generates air flow during the operation of the motor, forming a cooling air flow to effectively dissipate heat from the permanent magnet. Combined with the axial ventilation holes of the rotor core, a complete heat dissipation channel is formed, significantly improving the heat dissipation effect of the permanent magnet and avoiding the demagnetization phenomenon caused by overheating of the permanent magnet. At the same time, threaded holes are provided on the end plate, and by installing weighted screws and washers, the dynamic balance of the rotor can be conveniently corrected, and counterweight screws are horizontally arranged on the weighted screws, greatly enhancing the structural stability.

[0008] Optionally, washers are sleeved on the weighted screws, and the number of the washers is multiple, and the multiple washers are sleeved on the weighted screws layer by layer.

[0009] By adopting the above technical solutions, the dynamic balance correction of the rotor is achieved by adjusting the number of washers.

[0010] Optionally, the centrifugal fan structure is composed of multiple blade shapes, and the centrifugal fan structure is detachable.

[0011] By adopting the above technical solutions, the centrifugal fan is optimized according to the operating speed of the motor to achieve the best cooling effect, and the centrifugal fan structure is detachable, which is convenient for maintenance and replacement.

[0012] Optionally, axial ventilation holes are provided on the rotor core.

[0013] By adopting the above technical solutions, the ventilation holes cooperate with the centrifugal fan structure to cool the rotor permanent magnet.

[0014] Optionally, the material of the end plate is cast aluminum.

[0015] By adopting the above technical solutions, the cast aluminum material has a lower density, which can reduce the overall weight of the motor, contribute to improving energy efficiency and reducing energy consumption.

[0016] Optionally, the steel ring inlaid in the inner hole of the end plate is fixed to the end plate by a cold pressing process.

[0017] By adopting the above technical solutions, through the cold pressing process, it is ensured that the components will not fall off during the high-speed operation of the motor.

[0018] Optionally, the end plate is press-fitted to both sides of the rotor core by a cold pressing process.

[0019] By adopting the above technical solutions, through the cold pressing process, it is ensured that the end plate is tightly combined with the rotor core, providing stable structural support.

[0020] Optionally, the counterweight screw and the weightening screw are arranged vertically and crosswise.

[0021] By adopting the above technical solution, the counterweight screw and the weightening screw arranged vertically and crosswise can provide balance adjustment in multiple directions, which helps to optimize the dynamic balance of the motor rotor.

[0022] Optionally, the counterweight screw is adapted to the jack and the second threaded hole, and sealing rings are provided on the jack, the first threaded hole and the second threaded hole.

[0023] By adopting the above technical solution, the precise fit of the counterweight screw with the jack and the second threaded hole can ensure that the screw is correctly installed on the end plate, avoiding structural instability or performance degradation caused by improper fit.

[0024] Optionally, the steel ring embedded in the inner hole of the end plate is made of high-strength alloy material, the aluminum alloy component in the end plate material is made of high thermal conductivity material, and the outer surface of the end plate is anodized.

[0025] By adopting the above technical solution, the wear resistance and durability of the end plate can be further improved, the overall heat dissipation performance of the end plate can be further improved, and the corrosion resistance of the end plate can be further improved.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: First, in order to enhance the protection of the magnet, a steel ring is embedded in the inner hole of the end plate and fixed on the rotating shaft through a cold pressing process, effectively protecting the magnet and preventing it from shifting or falling off under high-speed rotation and high-temperature environments, extending the service life of the magnet. Second, the heat dissipation performance is improved. One side of the end plate is designed as a centrifugal fan blade structure, which generates air flow during the operation of the motor to form a cooling air flow for effective heat dissipation of the magnet. Combined with the axial ventilation holes of the rotor core, a complete heat dissipation channel is formed, significantly improving the heat dissipation effect of the magnet and avoiding the demagnetization phenomenon caused by overheating of the magnet. Finally, for the convenience of dynamic balance correction, threaded holes are provided on the end plate. By installing weightening screws and washers, the dynamic balance of the rotor can be conveniently corrected, and a counterweight screw is horizontally arranged on the weightening screw, greatly enhancing the structural stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic cross-sectional structure view of the rotor core in the present utility model.

[0028] Figure 2 is a schematic structure view of the magnet in the present utility model.

[0029] Figure 3 is a schematic structure view of the weightening screw in the present utility model.

[0030] Reference signs: 1, rotor core; 2, permanent magnet; 3, end plate; 4, steel ring; 5, rotating shaft; 6, centrifugal fan structure; 7, first threaded hole; 8, weight screw; 81, jack; 9, second threaded hole; 10, counterweight screw; 11, nut; 12, gasket. Detailed implementation mode

[0031] In the following, the present utility model will be described in detail with reference to the drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0032] As Figures 1 to 3 In an embodiment of the permanent magnet synchronous motor rotor of the present utility model shown in the figure, the permanent magnet synchronous motor rotor of this embodiment includes a rotor core 1 and a permanent magnet 2 installed on the rotor core 1. End plates 3 are installed at both ends of the rotor core 1. The material of the end plate 3 is cast aluminum. The aluminum alloy component in the material of the end plate 3 adopts a high thermal conductivity material. The outer surface of the end plate 3 is anodized. The end plate 3 is press-fitted on the rotating shaft 5 through a steel ring 4 embedded in the inner hole. The steel ring 4 embedded in the inner hole of the end plate 3 adopts a high-strength alloy material. The steel ring 4 embedded in the inner hole of the end plate 3 is fixed to the end plate 3 by a cold pressing process. The end plate 3 is press-fitted to both sides of the rotor core by a cold pressing process. One side of the end plate 3 is designed with a centrifugal fan structure 6. The centrifugal fan structure 6 is composed of multiple blade shapes, and the centrifugal fan structure 6 is detachable. Axial ventilation holes are provided on the rotor core 1. A first threaded hole 7 is opened at the tail end of the end plate 3. A weight screw 8 is threadedly connected to the first threaded hole 7. A second threaded hole 9 is opened on the side surface of the end plate 3. A counterweight screw 10 is threadedly connected to the second threaded hole 9. A jack 81 is opened at the front end of the weight screw 8. The counterweight screw 10 passes through the jack 81 on the weight screw 8 and extends to the outside of the end plate 3. A nut 11 is threadedly connected to one end of the counterweight screw 10.

[0033] Specifically, first, in order to enhance the protection of the permanent magnet 2, a steel ring 4 is embedded in the inner hole of the end plate 3 and fixed on the rotating shaft 5 through a cold pressing process, effectively protecting the permanent magnet 2 and preventing it from shifting or falling off in a high-speed rotation and high-temperature environment, and extending the service life of the permanent magnet 2. Secondly, to improve the heat dissipation performance, one side of the end plate 3 is designed as a centrifugal fan structure 6, which generates air flow during the operation of the motor to form a cooling air flow and effectively dissipates heat from the permanent magnet 2. Combined with the axial ventilation holes of the rotor core, a complete heat dissipation channel is formed, significantly improving the heat dissipation effect of the permanent magnet and avoiding the demagnetization phenomenon caused by overheating of the permanent magnet. Finally, for the convenience of dynamic balance correction, threaded holes are opened on the end plate 3. By installing the weight screw 8 and the gasket 12, the dynamic balance of the rotor can be conveniently corrected, and a counterweight screw 10 is horizontally arranged on the weight screw 8, greatly enhancing the structural stability.

[0034] As Figure 3As shown, a washer 12 is sleeved on the weight screw 8. The number of washers 12 is multiple, and multiple washers 12 are sleeved on the weight screw 8 layer by layer. The counterweight screw 10 is vertically and crosswise arranged with the weight screw 8. The counterweight screw 10 is adapted to the jack 81 and the second threaded hole 9, and sealing rings are arranged on the jack 81, the first threaded hole 7 and the second threaded hole 9.

[0035] Furthermore, a plurality of washers 12 are sleeved on the weight screw 8, and multiple washers 12 are sleeved on the weight screw layer by layer. By increasing or decreasing the number of washers 12, the weight distribution of the rotor can be accurately adjusted to achieve more precise dynamic balance correction; the counterweight screw 10 is vertically and crosswise arranged with the weight screw 8, and the counterweight screw 10 is adapted to the jack 81 and the second threaded hole 9, so that there are multiple ways for dynamic balance correction. The weight distribution of the rotor is further adjusted through the counterweight screw 10 to ensure the accuracy of dynamic balance.

[0036] The working principle of the present utility model: It is improved from three aspects. One, steel ring fixation: A steel ring 4 made of high-strength alloy material is inlaid in the inner hole of the end plate 3 and fixed on the rotating shaft 5 through a cold pressing process. This design effectively protects the magnet 2 and prevents it from shifting or falling off under high-speed rotation and high-temperature environments, thereby extending the service life of the magnet 2;

[0037] Two, heat dissipation performance: A centrifugal fan blade structure 6 in the shape of multiple blades is designed on one side of the end plate 3. This structure generates air flow during the operation of the motor to form a cooling air flow and effectively dissipates heat from the magnet 2.

[0038] Three, weight screw 8 and washer 12: A first threaded hole 7 is opened on the end plate 3, and a weight screw 8 is threadedly connected. A plurality of washers 12 are sleeved on the weight screw 8, and multiple washers 12 are sleeved on the weight screw 8 layer by layer. By increasing or decreasing the number of washers 12, the weight distribution of the rotor can be accurately adjusted to achieve more precise dynamic balance correction; counterweight screw: A second threaded hole 9 is opened on the side of the end plate 3, and a counterweight screw 10 is threadedly connected. The counterweight screw 10 passes through the jack 81 on the weight screw 8 and extends to the outside of the end plate 3. The counterweight screw 10 is adapted to the jack 81 and the second threaded hole 9, and a nut 11 is threadedly connected to one end of the counterweight screw 10. The weight screw 8 and the counterweight screw 10 are vertically and crosswise arranged. The weight distribution of the rotor is further adjusted through the counterweight screw 10 to ensure the accuracy of dynamic balance.

[0039] All the electrical components appearing in this text are electrically connected to the external main controller and the 220V mains power supply, and the main controller can be a conventional known device such as a computer for control.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0041] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A permanent magnet synchronous motor rotor, characterized in that, It includes a rotor core (1) and magnets (2) mounted on the rotor core. End plates (3) are installed at both ends of the rotor core (1). The end plates (3) are press-fitted onto a rotating shaft (5) through steel rings (4) embedded in the inner holes. A centrifugal fan blade structure (6) is designed on one side of the end plate (3). A first threaded hole (7) is opened at the tail end of the end plate (3). A weightening screw (8) is threadedly connected to the first threaded hole (7). A second threaded hole (9) is opened on the side surface of the end plate (3). A counterweight screw (10) is threadedly connected to the second threaded hole (9). A jack (81) is opened at the front end of the weightening screw (8). The counterweight screw (10) penetrates through the jack (81) on the weightening screw (8) and extends to the outside of the end plate (3). A nut (11) is threadedly connected to one end of the counterweight screw (10).

2. The permanent magnet synchronous motor rotor according to claim 1, characterized in that, A gasket (12) is sleeved on the weightening screw (8). The number of the gaskets (12) is multiple, and the multiple gaskets (12) are sleeved on the weightening screw (8) layer by layer.

3. The permanent magnet synchronous motor rotor according to claim 1, characterized in that, The centrifugal fan blade structure (6) is composed of multiple blade shapes, and the centrifugal fan blade structure (6) is detachable.

4. The permanent magnet synchronous motor rotor according to claim 1, wherein Axial ventilation holes are provided on the rotor core (1).

5. The permanent magnet synchronous motor rotor according to claim 1, wherein The material of the end plate (3) is cast aluminum.

6. The permanent magnet synchronous motor rotor according to claim 1, characterized in that, The steel ring (4) embedded in the inner hole of the end plate (3) is fixed to the end plate (3) by a cold pressing process.

7. The permanent magnet synchronous motor rotor according to claim 1, wherein, The end plate (3) is press-fitted onto both sides of the rotor core (1) by a cold pressing process.

8. The permanent magnet synchronous motor rotor according to claim 1, characterized in that, The counterweight screw (10) and the weightening screw (8) are arranged in a perpendicular and crosswise manner.

9. The permanent magnet synchronous motor rotor according to claim 1, characterized in that, The counterweight screw (10) is adapted to the jack (81) and the second threaded hole (9), and sealing rings are provided on the jack (81), the first threaded hole (7) and the second threaded hole (9).

10. The permanent magnet synchronous motor rotor according to claim 1, characterized in that, The steel ring (4) embedded in the inner hole of the end plate (3) is made of a high-strength alloy material. The aluminum alloy component in the material of the end plate (3) is made of a material with high thermal conductivity. The outer surface of the end plate (3) is subjected to an anodic oxidation treatment.

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