CN220732470U

CN220732470U - Cooling structure of automobile permanent magnet motor rotor core magnetic steel

Info

Publication number: CN220732470U
Application number: CN202321993104.8U
Authority: CN
Inventors: 郭胜法; 孔雷; 颜帅
Original assignee: Qufu Skykon Electric Technology Co ltd
Current assignee: Qufu Skykon Electric Technology Co ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-04-05
Anticipated expiration: 2033-07-27

Abstract

The utility model discloses a cooling structure of an iron core magnetic steel of a rotor of an automobile permanent magnet motor, belongs to the technical field of motor design, and solves the problems that an air-cooled or water-cooled motor cannot cool a rotor, high power density is achieved, the design structure of a traditional oil-cooled motor is complex, the structure of a die is complex, and large-scale production is difficult to achieve. The technical scheme is characterized by comprising a rotating shaft, a rotor bracket, a balance end plate and a rotor core section; the rotating shaft is a hollow shaft, and a radial oil passage of the rotating shaft is formed in the middle of the rotating shaft; the middle part of the rotor bracket is provided with a radial oil passage and a circumferential oil passage, and the section is provided with an end face oil passage; when the hollow shaft is filled with cooling oil, the cooling oil flows through the axial oil channels, the circumferential oil channels and the axial oil channels of the rotating shaft and the rotor bracket under the action of centrifugal force and the pressure of the oil pump, and finally flows out from the end surface oil channels. The motor has the advantages of reasonable structure, simple process, convenient assembly and improved motor performance.

Description

Cooling structure of automobile permanent magnet motor rotor core magnetic steel

Technical Field

The utility model belongs to the technical field of motor design, and particularly relates to a cooling structure.

Background

The rapid development of new energy automobiles brings great development opportunities to driving motors, and the development of motor technology becomes a focus of industrial attention. At present, the driving motor is mainly divided into a direct current motor, an alternating current motor, a hub motor and the like; wherein the dc and ac motors may be further divided. The current industry has higher attention to alternating current asynchronous motors, permanent magnet synchronous motors and switched reluctance motors. The permanent magnet synchronous motor is a main driving motor in the electric vehicle market by virtue of the advantages of high efficiency, wide rotating speed range, small volume, light weight, high power density, low cost and the like.

At present, the cooling modes of the permanent magnet motor are divided into three types, namely air cooling, water cooling and oil cooling; the air cooling and water cooling motor adopts a designed air duct or water channel to cool the motor shell, thereby achieving the purpose of cooling the motor, but the two cooling modes can only cool the stator and can not effectively cool the rotor. When the motor runs under high load, the temperature rise of the rotor is too high, the rotor cannot be cooled in time, and the risk of demagnetization of the permanent magnet is large, so that the use of the motor is affected. And because of the inherent design structure of air cooling and water cooling, the motor cannot achieve small volume and high power density; the traditional oil cooling motor adopts a special oil duct design to radiate heat for the rotor, and has the advantages of complex structure, poor processing performance, complex die structure, high cost and the need of a plurality of sets of rotor punching dies.

Disclosure of Invention

The utility model discloses a cooling structure of an iron core magnetic steel of a rotor of an automobile permanent magnet motor, which solves the problems that the existing air-cooled or water-cooled motor cannot cool a rotor, cannot realize high power density, has a complicated design structure of the traditional oil-cooled motor, has a complex mold structure and is difficult to realize large-scale production in batches.

The technical scheme of the utility model is that the cooling structure of the rotor core magnetic steel of the automobile permanent magnet motor comprises a motor shaft, a rotor bracket, a balance end plate and a rotor core section;

the rotating shaft adopts a hollow shaft, the outer diameter of the hollow shaft is fixedly connected with the inner diameter of the rotor support through bolts, and the rotor core section is fixedly connected to the outer diameter of the rotor support through interference. The cooling oil is introduced from the shaft hole at one end of the hollow shaft, the centrifugal force generated by the spindle during the rotation of the motor throws the oil into a radial oil passage formed by the hollow shaft and the rotor support, the radial oil passage is extruded into an axial oil passage between the matching surface of the rotor support and the rotor core through the centrifugal force, the rotor core is cooled, and the cooling oil flows out from the balance end plates at the two ends of the rotor core section, so that the cooling of the rotor core magnetic steel is realized.

The number, depth and width of the cooling oil channels of the rotor bracket are adjustable according to actual needs, the number of the radial oil channels is the same as that of bolt holes uniformly distributed on the cooling oil channels, the number of the radial oil channels is preferably 2 times that of the radial oil channels on the hollow shaft, and the cooling oil channels can be aligned without special positioning during installation.

Drawings

Fig. 1 is a schematic diagram of a cooling gallery of the present utility model.

Fig. 2 is a view showing an external structure of the rotor frame.

Fig. 3 is a sectional view showing the internal structure of the rotor holder.

Fig. 4 is a side view of the rotor frame.

Fig. 5 is a sectional view of a radial oil passage of a motor shaft.

In the figure: the rotor comprises a rotating shaft 1, a rotor support 2, a balance end plate 3, a rotor core section 4, a circumferential oil passage 5, an axial oil passage 6, a rotor support radial oil passage 7, a rotor support end face oil passage 8 and a rotating shaft radial oil passage 9.

Detailed Description

Examples

Referring to fig. 1, the motor rotor core magnetic steel cooling structure comprises a rotating shaft 1, a rotor bracket 2, a balance end plate 3 and a rotor core section 4; the rotating shaft 1 is a hollow shaft, the inside of the rotating shaft is hollow, 4 radial oil channels are uniformly distributed in the middle of the rotating shaft, and the specific radial oil channels can be seen in fig. 4; the rotor bracket 2 is uniformly distributed with 8 radial oil channels at the middle part thereof and is communicated with 8 axial oil channels on an excircle, and the 8 axial oil channels are connected together through annular oil channels thereon, and particularly, the rotor bracket can be seen in fig. 2 and 3.

The outer diameter of the rotating shaft 1 is fixedly connected with the inner diameter of the rotor support 2 through bolts, and the rotor core section 4 is fixedly connected to the outer diameter of the rotor support 2 through interference. The cooling oil is introduced from the shaft hole at one end of the rotating shaft 1, the centrifugal force generated by the spindle during the rotation of the motor throws the oil into a radial oil passage formed by the rotating shaft 1 and the rotor support 2, the radial oil passage is extruded into an axial oil passage between the matching surfaces of the rotor support 2 and the rotor core section 4 by the centrifugal force, the rotor core is cooled, and the cooling oil flows out from the balance end plates 3 at the two ends of the rotor core section, so that the cooling of the rotor core magnetic steel is realized.

The number, depth and width of the cooling oil channels of the rotor support 2 are adjustable according to actual needs, the number of the radial oil channels is the same as that of the bolt holes uniformly distributed on the cooling oil channels, the number of the radial oil channels is preferably 2 times that of the radial oil channels on the rotating shaft 1, and the cooling oil channels and the radial oil channels can be aligned without special positioning during installation.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The cooling structure of the rotor core magnetic steel of the automobile permanent magnet motor is characterized by comprising a motor shaft, a rotor bracket, a balance end plate and a rotor core section; the rotating shaft adopts a hollow shaft, the outer diameter of the hollow shaft is fixedly connected with the inner diameter of the rotor support through bolts, and the rotor core section is fixedly connected to the outer diameter of the rotor support through interference.

2. The cooling structure of the rotor core magnetic steel of the permanent magnet motor of the automobile according to claim 1, wherein: 4 radial oil channels are uniformly distributed in the middle of the rotating shaft.

3. The cooling structure of the rotor core magnetic steel of the permanent magnet motor of the automobile according to claim 1, wherein: the rotor support comprises 8 radial oil channels uniformly distributed on the rotor support and 8 axial oil channels butted with the radial oil channels.

4. The cooling structure of the rotor core magnetic steel of the permanent magnet motor of the automobile according to claim 1, wherein: the 8 axial oil channels on the rotor support are connected through annular oil channels.

5. The cooling structure of the rotor core magnetic steel of the permanent magnet motor of the automobile according to claim 1, wherein: the number of the radial oil channels on the rotor bracket is kept the same as that of the bolt holes uniformly distributed on the rotor bracket, and is 2 times of that of the radial oil channels on the rotating shaft.