Rotor structure of permanent magnet motor

Abstract

The utility model discloses a permanent magnet motor rotor structure, which comprises a rotating shaft, a rotor iron core sleeved on the rotating shaft, a plurality of permanent magnets assembled on the surface of the rotor iron core in a surface-mounted manner, and end plates respectively fixed at the end parts of the two sides of the rotor iron core, the rotor iron core is provided with axial heat dissipation grooves which are axially arranged in a penetrating mode and radial heat dissipation grooves which are arranged in a radial opening mode and are communicated with the axial heat dissipation grooves, the radial heat dissipation grooves are exposed between the adjacent permanent magnets, and the end plates are provided with heat dissipation holes which correspond to the axial heat dissipation grooves and are communicated with the axial heat dissipation grooves. The rotor structure adopts an axial heat dissipation mode, and cold gas enters the rotor core through the axial heat dissipation grooves and then is blown out through the radial heat dissipation grooves, so that heat dissipation of the rotating shaft and the permanent magnets is realized, the heat dissipation efficiency is improved, and the probability of demagnetization of the permanent magnets is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to permanent magnet motor technical field especially relates to a permanent magnet motor rotor structure. BACKGROUND

[0002] Permanent magnet motor is widely applied in many fields because of simple structure, small size, high efficiency and excellent force and energy index. Because of the existence of permanent magnet, the traditional permanent magnet motor rotor structure works, and the permanent magnet produces a large amount of heat due to magnetic hysteresis loss. Magnetic hysteresis loss refers to the energy loss produced by the rearrangement of the magnetic domain inside the permanent magnet during the change of the magnetic field. When the permanent magnet is in the alternating magnetic field, the magnetic domain will constantly flip with the change of the magnetic field, and energy loss will be produced in this process, thereby causing the permanent magnet to heat. The overheated permanent magnet will affect the magnetism of the permanent magnet, and even cause demagnetization phenomenon, affecting the performance of the permanent magnet motor. SUMMARY

[0003] The utility model discloses a permanent magnet motor rotor structure.

[0004] To realize the above-mentioned utility model purpose, the utility model adopts the following technical scheme: a permanent magnet motor rotor structure, which comprises a rotating shaft, a rotor core sleeved on the rotating shaft, a plurality of surface-mounted permanent magnets assembled on the surface of the rotor core and end plates fixed on the two side end portions of the rotor core respectively, the rotor core has an axial heat dissipation groove penetrating in the axial direction and a radial heat dissipation groove opening in the radial direction and communicating with the axial heat dissipation groove, the radial heat dissipation groove is exposed between the adjacent permanent magnets, and the end plate is provided with a heat dissipation hole corresponding to and communicating with the axial heat dissipation groove.

[0005] As a further improved technical scheme of the utility model, the axial heat dissipation grooves are fan-shaped and four in number, and the four heat dissipation grooves are uniformly distributed along the circumference.

[0006] As a further improved technical scheme of the utility model, the heat dissipation holes are fan-shaped and four in number, and the four heat dissipation holes are uniformly distributed along the circumference.

[0007] As a further improved technical scheme of the utility model, the radial heat dissipation grooves are fan-shaped, and four uniformly distributed radial heat dissipation grooves are distributed on the same circumference.

[0008] As a further improved technical scheme of the utility model, the plurality of radial heat dissipation grooves are divided into four groups, and the radial heat dissipation grooves in each group are distributed in the axial direction.

[0009] As a further improved technical scheme of the utility model, it further comprises a plurality of ventilation groove plates sleeved on the rotor core and arranged at intervals, and a mounting groove is formed between the adjacent ventilation groove plates.

[0010] As a further improved technical scheme of the utility model, the plurality of permanent magnets are assembled in the mounting groove along the circumference, and the permanent magnets avoid the radial heat dissipation groove when the mounting groove is communicated with the radial heat dissipation groove.

[0011] As a further improved technical scheme of the utility model, part of the permanent magnets are located on the upper side of the axial heat dissipation groove; along the axial direction, the permanent magnets and the radial heat dissipation groove are arranged alternately.

[0012] As a further improved technical scheme of the utility model, the permanent magnets are pasted to the surface of the rotor core through glue.

[0013] As a further improved technical scheme of the utility model, the plurality of permanent magnets have different widths and / or lengths.

[0014] The rotor structure adopts the axial heat dissipation mode, the cold gas enters the inside of the rotor core through the axial heat dissipation groove, and is blown out through the radial heat dissipation groove, so that the heat dissipation of the rotating shaft and the permanent magnet is realized, the heat dissipation efficiency is increased, the heat of the rotating shaft is taken away at the same time of the heat dissipation of the permanent magnet, the probability of demagnetization of the permanent magnet is reduced, the use time of the permanent magnet motor is increased, and the load capacity of the permanent magnet motor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structure schematic view of a permanent magnet motor rotor structure of the utility model;

[0016] Figure 2 is Figure 1 a structure schematic view from another angle;

[0017] Figure 3 is Figure 1 a structure schematic view from another angle;

[0018] Figure 4 is Figure 2 an enlarged schematic view of the middle circle A;

[0019] Figure 5 is a schematic view of a permanent magnet of the permanent magnet motor rotor structure of the utility model. DETAILED DESCRIPTION

[0020] The utility model will be described in detail in combination with the embodiments shown in the drawings. Please refer to the drawings shown, which are the preferred embodiments of the utility model. It should be noted that these embodiments are not a limitation on the utility model, and equivalent changes or substitutions of function, method or structure made by those skilled in the art according to these embodiments are within the protection scope of the utility model.

[0021] Please refer toFigures 1 to 5 The utility model discloses a permanent magnet motor rotor structure 100, it includes the pivot 1, the rotor core 2 of sleeve setting in pivot 1, the surface -paste type assembly on the surface of rotor core 2 several permanent magnet 3 and the end plate 4 fixed in the both sides end of rotor core 3 respectively. Rotor core 2 has the axial heat dissipation groove 21 of axial through -going arrangement and the radial heat dissipation groove 22 of radial opening arrangement and with axial heat dissipation groove 21 intercommunication, radial heat dissipation groove 22 exposes between adjacent permanent magnet 3, and end plate 4 is equipped with the heat dissipation hole 41 of axial heat dissipation groove 21 correspondence and intercommunication. Rotor structure 100 adopts the mode of axial heat dissipation, and cold gas enters the inside of rotor core 2 through axial heat dissipation groove 21, then blows out through radial heat dissipation groove 22, realizes the heat dissipation of pivot 1 and permanent magnet 3, to increase the heat dissipation efficiency, in the heat dissipation of permanent magnet 3 also carries away the heat of pivot 1 simultaneously, to reduce the probability of permanent magnet 3 demagnetization, to increase permanent magnet motor use time, improve permanent magnet motor load capacity.

[0022] Specifically, the axial heat dissipation groove 21 is fan-shaped and has four, the four heat dissipation grooves 21 are evenly distributed along the circumference. Correspondingly, the heat dissipation holes 41 are fan-shaped and have four, the four heat dissipation holes 41 are evenly distributed along the circumference. And the radial heat dissipation groove 22 is fan-shaped, and four evenly distributed radial heat dissipation grooves 22 are distributed on the same circumference. The plurality of radial heat dissipation grooves 22 are divided into four groups, and each group of radial heat dissipation grooves 22 is spaced apart along the axial direction. During heat dissipation, cold gas enters the axial heat dissipation groove 21 from the heat dissipation hole 41, a part of the cold gas enters the axial heat dissipation groove 21 from the heat dissipation hole 41 of one side end plate 4, and then passes through the axial heat dissipation groove 21 along the axial direction and blows out from the heat dissipation hole 41 of the other side end plate 4; another part of the cold gas blows out from the radial heat dissipation groove 22 in communication with the axial heat dissipation groove 21, thereby timely removing the heat of the pivot 1 and the permanent magnet 3 and improving the heat dissipation efficiency.

[0023] Further, the rotor structure 100 further includes a plurality of ventilation groove plates 5 sleeved on the rotor core 2 and spaced apart, and an installation groove 51 is formed between adjacent ventilation groove plates 5. The plurality of permanent magnets 3 are assembled in the installation groove 51 along the circumference, and the permanent magnets 3 avoid the radial heat dissipation groove 22 when the installation groove 51 is in communication with the radial heat dissipation groove 22, so as to ensure that the heat is blown out in time. Part of the permanent magnets 3 is located on the upper side of the axial heat dissipation groove 21. Along the axial direction, the permanent magnets 3 and the radial heat dissipation grooves 22 are alternately arranged to improve the heat dissipation efficiency.

[0024] Preferably, the permanent magnets 3 are pasted to the surface of the rotor core 2 by glue, and the permanent magnets 3 are firmly installed in the installation groove 51 by magnetism and glue. The plurality of permanent magnets 3 have different widths and / or lengths. According to the design and magnetic requirements, the width or length of the permanent magnet 3 is not limited and can be variously arranged. In one embodiment, please refer to Figure 2 The permanent magnets 3 have two widths, and the wide and narrow are alternately and spaced apart.

[0025] The above series of detailed descriptions are only specific descriptions for the feasible implementation manners of the present application, and are not used to limit the protection scope of the present application. Any equivalent implementation manners or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A permanent magnet electric machine rotor structure, characterized by, It includes a rotating shaft, a rotor core sleeved on the rotating shaft, a plurality of surface-mounted permanent magnets assembled on the surface of the rotor core, and end plates fixed on both sides of the rotor core, the rotor core has an axial heat dissipation groove arranged axially and a radial heat dissipation groove arranged radially and communicated with the axial heat dissipation groove, the radial heat dissipation groove is exposed between adjacent permanent magnets, and the end plate is provided with a heat dissipation hole corresponding to and communicated with the axial heat dissipation groove.

2. The permanent magnet machine rotor structure of claim 1, wherein, The axial heat dissipation grooves are fan-shaped and have four, and the four heat dissipation grooves are uniformly distributed along the circumference.

3. A permanent magnet machine rotor structure according to claim 2, characterised in that, The heat dissipation holes are fan-shaped and have four, and the four heat dissipation holes are uniformly distributed along the circumference.

4. The permanent magnet machine rotor structure of claim 2, wherein, The radial heat dissipation grooves are fan-shaped, and four uniformly distributed radial heat dissipation grooves are distributed on the same circumference.

5. A permanent magnet electric machine rotor structure according to claim 4, characterized in that, The radial heat dissipation grooves are divided into four groups, and the radial heat dissipation grooves in each group are distributed axially.

6. The permanent magnet machine rotor structure of claim 1, wherein, It also includes a plurality of ventilation groove plates sleeved on the rotor core and arranged at intervals, and a mounting groove is formed between adjacent ventilation groove plates.

7. A permanent magnet electric machine rotor structure according to claim 6, characterized in that, A plurality of permanent magnets are assembled in the mounting groove along the circumference, and the permanent magnets avoid the radial heat dissipation grooves when the mounting groove is communicated with the radial heat dissipation grooves.

8. A permanent magnet motor rotor structure according to claim 7, characterised in that, Part of the permanent magnets are located on the upper side of the axial heat dissipation groove; in the axial direction, the permanent magnets and the radial heat dissipation grooves are arranged alternately.

9. The permanent magnet motor rotor structure of claim 7, wherein, The permanent magnets are pasted to the surface of the rotor core by glue.

10. The permanent magnet motor rotor structure of claim 7, wherein, A plurality of permanent magnets have different widths and / or lengths.

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