Lightweight high-power permanent magnet motor suspension rotor structure

Abstract

The utility model relates to a lightweight high-power permanent magnet motor suspension rotor structure, which comprises a hollow rotating shaft, radial magnetic bearing rotors and a permanent magnet motor rotor, the permanent magnet motor rotor is arranged in the middle of the hollow rotating shaft, and the radial magnetic bearing rotors are respectively arranged at two ends of the hollow rotating shaft, so that reliable supporting of the rotors is realized; the hollow rotating shaft adopts a stepped hollow shaft capable of reducing the mass of the rotating shaft; the permanent magnet motor rotor is fixedly connected with the hollow rotating shaft through supporting rings at the two ends, and a hollow structure capable of reducing the mass of the motor rotor is arranged between the two supporting rings. According to the utility model, the lightweight design of the rotor of the high-power magnetic suspension permanent magnet motor is realized, the mass of the rotor is reduced, the requirement on the bearing capacity of the magnetic bearing is reduced, and the volume and the heating value of the magnetic suspension bearing are also reduced.

Description

Technical Field

[0001] The utility model relates to a lightweight high-power permanent magnet motor suspended rotor structure, which reduces the rotor mass and the magnetic bearing support load through a lightweight structural design. Background Art

[0002] Magnetic bearings offer unique advantages such as contactless support, high rotor speeds, long service life, and the absence of lubrication. They are widely used in high-speed electromechanical equipment and in applications with high vibration and noise requirements. In the marine motor sector, the use of magnetic bearing technology significantly reduces vibration and noise in motor equipment, leading to its increasing application.

[0003] For motors supported by magnetic bearings, the bearing capacity of the magnetic bearings needs to be determined based on the rotor weight and external load. The lightweight design of the rotor can effectively reduce the rotor mass, thereby reducing the volume and thermal load of the magnetic bearings and increasing the power density of the motor. Therefore, it is very necessary to carry out lightweight design for the magnetic bearings of magnetic motors. Summary of the Invention

[0004] The utility model proposes a lightweight high-power permanent magnet motor suspended rotor structure, which reduces the mass of the rotating shaft and the motor rotor through a special structural design, thereby reducing the load requirement of the magnetic bearing and improving the power density of the motor.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a lightweight, high-power permanent magnet motor suspended rotor structure, comprising a hollow rotating shaft, a radial magnetic bearing rotor, and a permanent magnet motor rotor, wherein the permanent magnet motor rotor is installed in the middle of the hollow rotating shaft, and radial magnetic bearing rotors are installed at both ends to achieve reliable support of the rotor; the hollow rotating shaft adopts a stepped hollow shaft that can reduce the mass of the rotating shaft; the permanent magnet motor rotor is fixedly connected to the hollow rotating shaft through supporting rings at both ends, and there is a hollow structure between the two supporting rings that can reduce the mass of the motor rotor.

[0006] Furthermore, the hollow portion of the hollow shaft is a three-section structure, the hollow portion of the middle core section has a large diameter, and the hollow portions at the front and rear ends have small diameters.

[0007] Furthermore, the radial magnetic bearing rotor includes an inner sleeve, a sensor rotor core, a middle end plate, and a radial bearing rotor core, and the sensor rotor core, the middle end plate, the radial magnetic bearing rotor core and the inner sleeve are shrink-fitted.

[0008] Furthermore, a dynamic balance support groove is provided on the middle end plate.

[0009] Furthermore, the permanent magnet motor rotor includes a support ring, a rotor core, a magnet, a sleeve and a magnet end plate. The rotor core is assembled at the support rings at both ends. The magnet is bonded to the outer surface of the rotor core and fixed by binding with the sleeve. Magnetic end plates are provided at both ends of the rotor core to prevent the magnet from axial slipping.

[0010] Furthermore, the rotor core and the support ring are assembled by interference fit; the magnetic steel end plate and the rotor core are assembled by shrink fit.

[0011] Furthermore, the rotor core of the permanent magnet motor rotor is interference-connected with the hollow shaft via a support ring.

[0012] The beneficial effects of the present invention are as follows: the present invention provides a lightweight, high-power permanent magnet motor suspended rotor structure, which is composed of a hollow shaft, a front / rear radial magnetic bearing rotor, and a permanent magnet motor rotor. This structure has the advantages of being compact, easy to maintain, and light in weight, and can reduce the magnetic bearing load-bearing capacity requirements and loss and heat generation. The hollow portion of the hollow shaft is a three-section structure, and the hollow portion of the middle iron core gear has a larger diameter, which can maximize the reduction of the shaft mass while ensuring that the structural strength meets the requirements; the permanent magnet motor rotor is composed of a supporting ring, a rotor core, a magnetic steel, and a sheath. The rotor core is assembled at the supporting rings at both ends, and the hollow structure is between the supporting rings, which reduces the mass of the motor rotor. The present invention realizes the lightweight design of the rotor of a high-power magnetic levitation permanent magnet motor, which reduces the demand for the magnetic bearing load-bearing capacity while reducing the rotor mass, and the volume and heat generation of the magnetic levitation bearing are also reduced.

[0013] In summary, the utility model reduces the mass of the rotating shaft and the motor rotor through a special structural design, thereby reducing the load requirement of the magnetic bearing and improving the power density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the suspended rotor of the lightweight, high-power permanent magnet motor of the present utility model;

[0015] Figure 2 Schematic diagram of a radial magnetic bearing rotor in an embodiment;

[0016] Figure 3 Schematic diagram of the lightweight permanent magnet motor rotor structure in implementation. DETAILED DESCRIPTION

[0017] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may 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 comprehensive understanding of the disclosure of the present application.

[0018] like Figure 1 As shown, a lightweight high-power permanent magnet motor suspended rotor structure of the present invention includes a hollow shaft 1, a front radial magnetic bearing rotor 2, a permanent magnet motor rotor 3, and a rear radial magnetic bearing rotor 4.

[0019] The permanent magnet motor rotor 3 and the front radial magnetic bearing rotor 2 and the rear radial magnetic bearing rotor 4 are respectively installed with the hollow shaft 1 by shrink fit. The front radial magnetic bearing 2 and the rear radial magnetic bearing rotor 4 are respectively located on both sides of the motor rotor to achieve reliable support of the rotor.

[0020] like Figure 2 As shown, the front radial magnetic bearing 2 and the rear radial magnetic bearing rotor 4 have the same structure, consisting of an inner sleeve 5, a sensor rotor core 6, a middle end plate 7, and a radial bearing rotor core 8. The sensor rotor core 6, middle end plate 7, and radial magnetic bearing rotor core 8 are shrink-fitted onto the inner sleeve 5. The sensor rotor core 6 is used to monitor the rotor position, and the radial magnetic bearing rotor core 8 provides a magnetic path for the magnetic bearing, thereby providing rotor suspension force. A dynamic balancing groove is provided on the outer diameter of the middle end plate 7 for dynamic balancing of the rotor.

[0021] like Figure 3 As shown, the permanent magnet motor rotor 3 structure includes a support ring 9, a rotor core 10, a magnetic steel 11, a sleeve 12 and a magnetic steel end plate 13.

[0022] The rotor core 10 is structurally supported by the support rings 9. There are cavities in the support rings at both ends, and the rotor core 10 and the support rings 9 are interference fitted. The magnets 11 are bonded to the outer surface of the rotor core 10 and fixed by binding with the sheath 12. The magnet end plates 13 and the rotor core 10 are shrink-fit fitted to prevent axial slippage of the magnets.

Claims

1. A lightweight, high-power permanent magnet motor suspended rotor structure, characterized by: It includes a hollow rotating shaft, a radial magnetic bearing rotor, and a permanent magnet motor rotor. The permanent magnet motor rotor is installed in the middle of the hollow rotating shaft, and radial magnetic bearing rotors are installed at both ends to achieve reliable support of the rotor; the hollow rotating shaft adopts a stepped hollow shaft that can reduce the mass of the rotating shaft; the permanent magnet motor rotor is fixedly connected to the hollow rotating shaft through supporting rings at both ends, and there is a hollow structure between the two supporting rings that can reduce the mass of the motor rotor.

2. The lightweight, high-power permanent magnet motor suspended rotor structure according to claim 1 is characterized in that: The hollow part of the hollow rotating shaft is a three-section structure, the hollow part of the middle iron core stage has a large diameter, and the hollow parts at the front and rear ends have small diameters.

3. The lightweight, high-power permanent magnet motor suspended rotor structure according to claim 1 is characterized in that: The radial magnetic bearing rotor comprises an inner sleeve, a sensor rotor core, a middle end plate, and a radial bearing rotor core. The sensor rotor core, the middle end plate, the radial magnetic bearing rotor core and the inner sleeve are shrink-fitted.

4. The lightweight, high-power permanent magnet motor suspended rotor structure according to claim 3 is characterized in that: A dynamic balance support groove is provided on the middle end plate.

5. The lightweight, high-power permanent magnet motor suspended rotor structure according to claim 1 is characterized in that: The permanent magnet motor rotor includes a support ring, a rotor core, a magnet, a sleeve and a magnet end plate. The rotor core is assembled at the support rings at both ends. The magnet is bonded to the outer surface of the rotor core and fixed by binding with the sleeve. Magnetic end plates are provided at both ends of the rotor core to prevent the magnet from axial slipping.

6. The lightweight, high-power permanent magnet motor suspended rotor structure according to claim 5, characterized in that: The rotor core and the supporting ring are assembled by interference fit; the magnetic steel end plate and the rotor core are assembled by shrink fit.

7. The lightweight, high-power permanent magnet motor suspended rotor structure according to claim 5, characterized in that: The rotor core of the permanent magnet motor rotor is interference-connected with the hollow rotating shaft via a supporting ring.

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