CN111509914A

CN111509914A - External rotation type motor structure

Info

Publication number: CN111509914A
Application number: CN201910098360.2A
Authority: CN
Inventors: 马斌严
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-01-31
Filing date: 2019-01-31
Publication date: 2020-08-07

Abstract

An external rotor motor structure comprises a rotor assembly, a stator assembly and a transfer fluid, wherein the rotor assembly comprises a shell and a bearing part, the inner side of the shell is combined with a plurality of permanent magnet sets, the stator assembly comprises a mandrel and a stator body, an air gap space is formed between the rotor assembly and the stator assembly, and the transfer fluid is filled in the air gap space to be respectively contacted with the stator and the rotor assembly, so that the transfer efficiency of magnetic energy or heat energy between the stator and the rotor assembly can be increased, and the efficiency of the motor can be improved.

Description

External rotation type motor structure

Technical Field

The present invention relates to an external rotation motor structure, and more particularly, to an external rotation motor structure in which a conductive fluid is disposed in an air gap space between a rotor and a stator to increase the magnetic energy or thermal energy transfer efficiency.

Background

A motor is an important device for converting electric energy into mechanical energy, and ideally, it is desirable to convert one hundred percent of input electric energy into mechanical energy for output. These efficiency losses are converted into heat, causing a temperature rise in the motor body.

Basically, the motor comprises two major parts, namely a fixed non-rotating stator and a rotor which rotates to output mechanical power, and the two major parts are separated by an air gap so as not to generate contact friction, but the air gap is a poor conductor of heat and magnetism. Generally, the winding coil of the motor is located on the stator, and when the motor operates at a low speed and a high torque, a large current needs to be applied to the motor winding, so that a large copper loss is generated in the stator winding.

The motors can be divided into an inward rotation type motor and an outward rotation type motor, the inward rotation type motor usually represents the motor stator at the outer side, the heat energy of copper loss can be directly conducted to the surrounding environment through the shell, and the heat dissipation effect of a winding coil is better; however, if the external rotor motor is used, the stator winding of the motor is located at the central portion of the motor, and the rotor is located at the peripheral portion, so that the copper loss of the stator winding is not easy to escape to the outside of the motor through the air gap, and a large amount of heat energy is accumulated in the motor, thereby affecting the efficiency and the service life of the motor, and even burning the coil.

Therefore, if the fluid with heat conduction or magnetic conduction capability is injected into the air gap between the stator and the rotor, the conventional air conduction mode can be replaced, and the outward rotating motor can also have good stator winding heat dissipation capability, so the technology of the invention can assist the outward rotating motor frequently used by the electric vehicle to effectively dissipate the copper heat loss of the stator winding, so as to effectively improve the performance and efficiency of the motor, and thus the invention is an optimal solution.

Disclosure of Invention

The present invention provides an external rotation motor structure, in which a conductive fluid is disposed in an air gap space between a rotor and a stator to increase the magnetic energy or thermal energy conduction efficiency, so as to improve the efficiency of the motor.

The present invention provides an external rotation type motor structure, at least comprising: a rotor assembly, which includes a housing and a bearing portion, and the inside of the housing is combined with a plurality of permanent magnet sets; a stator assembly including a mandrel and a stator body, wherein the stator body is arranged around the mandrel in a surrounding manner, and after the stator assembly is combined with the rotor assembly, an air gap space is formed between the rotor assembly and the stator assembly; a conductive fluid, which flows through the air gap space and contacts with the rotor assembly and the stator assembly respectively, to increase the conduction efficiency of heat energy or magnetic energy, so as to improve the efficiency of the motor.

More specifically, the conductive fluid can be a heat transfer fluid to facilitate thermal energy transfer between the rotor assembly and the stator assembly.

More specifically, the conductive fluid can be a magnetically conductive fluid to facilitate magnetic energy transfer between the rotor assembly and the stator assembly.

More specifically, the conductive fluid can be a fluid having heat and magnetic conductive functions, so as to facilitate thermal and magnetic energy conduction between the rotor assembly and the stator assembly.

More specifically, the conductive fluid contains magnetically conductive particles therein.

More specifically, the conductive fluid can completely fill the air gap space or partially fill the air gap space.

Other technical matters, features and effects of the present invention will become apparent from the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings.

Drawings

FIG. 1: the present invention is a schematic cross-sectional structure of an external rotation motor structure.

FIG. 2A: the present invention is a schematic diagram of the distribution of the conduction fluid in the external rotor motor structure.

FIG. 2B: the present invention is a schematic diagram of the distribution of the conduction fluid in the external rotor motor structure.

FIG. 3: another embodiment of the external rotor motor structure of the present invention is schematically illustrated in cross-sectional structure.

FIG. 4: another embodiment of the present invention is a conductive fluid distribution implementation of the external rotor motor structure.

Detailed Description

Please refer to fig. 1 and 2A, which are schematic structural diagrams and schematic conducting fluid distribution implementation diagrams of an external rotor motor structure of the present invention, as shown in the drawings, the external rotor motor structure mainly includes a rotor assembly 1 and a stator assembly 2, wherein the rotor assembly 1 includes a housing 11, a bearing portion 12 (inside of the bearing portion 12 is used for fixing the spindle 21) and a cover 13, and a plurality of permanent magnet sets 111 are combined inside the housing 11, and the motor can be changed according to different devices (for example, if the motor is used in an electric vehicle, the motor is a hub motor);

the stator assembly 2 mainly includes a mandrel 21 and a stator body 22, the stator body 22 is disposed around the mandrel 21, and the stator body 22 has a coil core for surrounding the coil 23, and the external rotation type motor mainly includes a rotor provided with a permanent magnet surrounding and sleeved outside the stator coil, and fixes the internal stator coil to rotate the external rotor, so that the external rotation type motor is characterized by the conventional external rotation type motor, and some existing components need not be described, and those related to the related art of the motor necessarily know;

after the rotor assembly 1 and the stator assembly 2 are combined, an air gap space 4 is formed between the rotor assembly 1 and the stator assembly 2, as shown in fig. 2A, the conductive fluid 3 exists in the air gap space 4, and since the conductive fluid 3 is used to increase the conductive effect, the efficiency of helping the thermal energy or magnetic energy conduction between the rotor assembly and the stator assembly at the two ends of the air gap space 4 can be achieved according to the type of the conductive fluid (heat conductive fluid or magnetic conductive fluid).

In addition, the conducting fluid 3 can partially fill the air gap space 4, and as shown in fig. 2B, the conducting fluid 3 can completely fill the air gap space 4.

In addition, for example, when the temperature coefficient of the copper wire resistance is about 0.004/deg.c, if the temperature rises by 30 deg.c, the copper loss generated by the same current will increase by 12%, so if the heat can be effectively dissipated, the copper loss can be reduced, and therefore, the conduction efficiency between the rotor assembly 1 and the stator assembly 2 can be improved through the present invention, which will greatly help the motor efficiency.

Further, as shown in fig. 3, the bearing portion 12 can be provided with a single-side through hole, and the inner wall surface of the housing 11 is provided with two fixing members 14, the inner sides of the fixing members 14 are respectively fixed to the two bearing portions 12, and the inner sides of the two bearing portions 12 respectively clamp the other end of the spindle 21, and this type of motor is used for a device or a vehicle requiring independent motors on both sides.

In addition, as shown in fig. 4, a gap can be designed between each permanent magnet set 111, and the conductive fluid 3 flows into the gap space between each permanent magnet set 111.

Compared with other conventional technologies, the external rotation type motor structure provided by the invention has the following advantages:

1. the invention injects the fluid (such as lubricating oil) with heat conduction or magnetic conduction capability into the air gap between the stator and the rotor of the motor to replace the traditional air conduction mode, so that the external rotation type motor also has good heat dissipation capability of the stator winding.

2. The invention improves the conduction efficiency between the rotor component and the stator component by conducting fluid, thereby effectively improving the motor efficiency.

The present invention is not limited to the above embodiments, and any person skilled in the art can understand the technical features and embodiments of the present invention and can not make any changes and modifications within the spirit and scope of the present invention.

Claims

1. An external rotation type motor structure at least comprises:

a rotor assembly, which includes a housing and a bearing portion, and the inside of the housing is combined with a plurality of permanent magnet sets;

a stator assembly including a mandrel and a stator body, wherein the stator body is arranged around the mandrel, and after the stator assembly is combined with the rotor assembly, an air gap space is formed between the rotor assembly and the stator assembly;

a conductive fluid is present in the air gap space and is respectively contacted with the rotor assembly and the stator assembly to increase the conduction efficiency of the heat energy or the magnetic energy.

2. The external rotor motor structure of claim 1 wherein the conductive fluid is a heat transfer fluid to aid in the transfer of heat energy between the rotor assembly and the stator assembly.

3. The external rotor motor structure of claim 1 wherein the conductive fluid is a magnetically conductive fluid to assist in magnetic energy transfer between the rotor assembly and the stator assembly.

4. The external rotor motor structure of claim 1 wherein the conductive fluid is a thermally and magnetically conductive fluid to aid in thermal and magnetic energy transfer between the rotor assembly and the stator assembly.

5. The external rotor motor structure of claim 3 or 4, wherein the conducting fluid contains magnetically conductive particles.

6. The external rotor motor structure of claim 1 wherein the conductive fluid completely fills the air gap space or partially fills the air gap space.