CN111509914A - External rotation type motor structure - Google Patents

Abstract

An external rotating motor structure includes a rotor assembly, a stator assembly and a conducting fluid, wherein the rotor assembly includes a housing and a bearing portion, and a plurality of permanent magnet groups are combined on the inner side of the housing, and the stator assembly includes a spindle and a stator body. An air gap space is formed between the rotor assembly and the stator assembly, and the conducting fluid is filled in the air gap space to contact the stator and rotor assemblies respectively, so that the conduction efficiency of magnetic energy or thermal energy between the stator and rotor assemblies can be increased, so as to improve the performance and efficiency of the motor.

Description

External rotation motor structure

technical field

The present invention relates to an externally rotating motor structure, in particular to an externally rotating motor structure with a conductive fluid built into the air gap space between the rotor and the stator to increase the conduction efficiency of its magnetic energy or thermal energy.

Background technique

A motor is an important device that converts electrical energy into mechanical energy. Ideally, we hope to convert 100% of the input electrical energy into mechanical energy for output, but in fact, the motor will lose efficiency during energy conversion, which includes copper loss. , iron loss, stray mechanical loss, etc. These efficiency losses are converted into heat to cause a temperature rise in the motor body.

Basically, the motor consists of a stationary stator and a rotor that rotates to output mechanical power. The middle is separated by an air gap to avoid contact friction, but this air gap is actually a poor conductor of heat and magnetism. Generally speaking, the winding coil of the motor is located on the stator, but when working at low speed and high torque, since a large current needs to be passed to the motor winding, a large copper loss will be generated in the part of the stator winding.

Motors can be divided into two categories: internal rotation and external rotation. Internal rotation motors usually represent that the stator of the motor is on the outside, and the heat energy of the copper loss can be directly conducted to the surrounding environment through the casing, which has a cooling effect on the winding coil. It is better; but if it is an externally rotating motor, it means that the stator winding of the motor is located in the central part of the motor, and the rotor is located in the outer part, which will make it difficult for the copper loss of the stator winding to dissipate to the outside of the motor through the air gap, resulting in a large amount of heat energy will accumulate inside the motor. , so it will affect the efficiency and life of the motor, and even burn the coil.

Therefore, if a fluid with thermal conductivity or magnetic conductivity can be injected into the air gap between the stator and the rotor, it will be able to replace the traditional air conduction method, so that the external rotating motor can also have a good heat dissipation capacity of the stator winding, Therefore, the technology of the present invention will be able to assist the external-rotating motor often used in electric vehicles to effectively dissipate the copper heat loss of the stator winding, so as to effectively improve the performance and efficiency of this type of motor, so the present invention should be an optimal solution. solution.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an externally rotating motor structure. A conductive fluid is placed in the air gap space between the rotor and the stator, so as to increase the conduction efficiency of its magnetic energy or thermal energy, so as to improve the performance and efficiency of the motor. efficiency.

The external rotation motor structure of the present invention includes at least: a rotor assembly, including a casing and a bearing part, and a plurality of permanent magnet groups are combined inside the casing; a stator assembly, including a mandrel and a stator body, the stator The body is arranged around the mandrel, and after the stator assembly and the rotor assembly are combined, an air gap space is formed between the rotor assembly and the stator assembly; a conduction fluid will circulate in the air gap space, and is respectively connected with the air gap space. The rotor assembly and the stator assembly are in contact to increase the conduction efficiency of thermal energy or magnetic energy, so as to improve the performance and efficiency of the motor.

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

More specifically, the conducting fluid can be a magnetic conducting fluid to facilitate the conduction of magnetic energy between the rotor assembly and the stator assembly.

More specifically, the conductive fluid can be a fluid with thermal conductivity and magnetic conductivity to facilitate the conduction of thermal and magnetic energy between the rotor assembly and the stator assembly.

More specifically, the conductive fluid contains magnetically conductive microparticles.

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

Other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings.

Description of drawings

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

FIG. 2A is a schematic diagram of the implementation of the conduction fluid distribution of the external rotation motor structure of the present invention.

FIG. 2B is a schematic diagram of the implementation of the conduction fluid distribution of the external rotation motor structure of the present invention.

FIG. 3 is a schematic cross-sectional structure diagram of another implementation of the external rotation motor structure of the present invention.

FIG. 4 is a schematic diagram of another implementation of the external rotation motor structure of the present invention for the distribution of conduction fluid.

Detailed ways

Please refer to FIGS. 1 and 2A , which are a schematic structural diagram and a schematic diagram of a conduction fluid distribution implementation of the outer-rotating motor structure of the present invention. As shown in the figures, the outer-rotating motor structure mainly includes a rotor assembly 1 and a stator assembly 2 , wherein the rotor assembly 1 includes a casing 11, a bearing portion 12 (the inner side of the bearing portion 12 is used to fix the spindle 21) and a cover 13, and the inner side of the casing 11 is combined with a plurality of permanent magnet groups 111, and The motor proposed in this case can be changed depending on the device used (for example, if it 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 arranged around the mandrel 21 , and the stator body 22 has a coil core to surround the coil 23 , and this type of The outer rotating motor mainly surrounds the rotor with permanent magnets on the outside of the stator coil, and fixes the inner stator coil and rotates the outer rotor, so this is the characteristic of the conventional outer rotating motor, so some have The components do not need to be explicitly stated, and those in the technical field of motors must be aware of it;

When 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 will exist in the air gap space 4 , and since the conduction fluid 3 is used to increase the conduction effect, it can be achieved according to the type of the conduction fluid (heat conduction fluid or magnetic conduction fluid), which can help the rotor assembly at both ends of the air gap space 4 and the stator assembly. The efficiency of thermal or magnetic energy transfer.

In addition, in addition to partially filling the air gap space 4 , the conductive fluid 3 can also completely fill the air gap space 4 as shown in FIG. 2B .

In addition, for example, when the temperature coefficient of copper wire resistance is about 0.004/°C, if the temperature increases by 30°C, the copper loss generated by the same current will increase by 12%. Therefore, if the heat dissipation can be effective, the copper loss will be reduced. Through this case, the conduction efficiency between the rotor assembly 1 and the stator assembly 2 can be improved, which will greatly help the motor efficiency.

In addition, as shown in FIG. 3 , the bearing portion 12 can be set to protrude through one side, and there are two fixing pieces 14 on the inner wall of the housing 11 , the inner side of the fixing piece 14 is respectively fixed with the two bearing portions 12 , and The inner sides of the two bearing parts 12 clamp the other end of the spindle 21 respectively, and this type of motor is used for devices or vehicles that require independent motors on both sides.

In addition, as shown in FIG. 4 , a gap can also be designed between each permanent magnet group 111 , and the conductive fluid 3 will flow into the gap space between each permanent magnet group 111 .

When compared with other conventional technologies, the external rotation motor structure provided by the present invention has the following advantages:

1. In the present invention, a fluid (such as lubricating oil) with thermal conductivity or magnetic conductivity is injected into the air gap between the stator and the rotor of the motor to replace the traditional air conduction method, so that the external rotation motor can also be used. It has a good heat dissipation capacity of the stator winding.

2. The present invention improves the conduction efficiency between the rotor assembly and the stator assembly by conducting the fluid, so the motor efficiency can be effectively improved.

The present invention has been disclosed above through the above-mentioned embodiments, but it is not intended to limit the present invention. Anyone familiar with this technical field with ordinary knowledge can understand the above-mentioned technical features and embodiments of the present invention, and understand the spirit and the spirit of the present invention. Within the scope, slight changes and modifications cannot be made, so the scope of the patent protection of the present invention shall be determined by the claims attached to this specification.

Claims (6)

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.

Images