WO2021114607A1

WO2021114607A1 - Ventilation and cooling structure of permanent magnet motor

Info

Publication number: WO2021114607A1
Application number: PCT/CN2020/098030
Authority: WO
Inventors: 贾喜勤; 许勇; 李广; 刘永强; 霍向飞; 姬春霞; 张婷
Original assignee: 中车永济电机有限公司
Priority date: 2019-12-09
Filing date: 2020-06-24
Publication date: 2021-06-17
Also published as: CN113036990A

Abstract

The present invention provides a ventilation and cooling structure of a permanent magnet motor, comprising a housing, a first end cover, a second end cover, a stator and an air driving device. The housing encloses a mounting channel, and the first end cover and the second end cover are respectively mounted at both ends of the mounting channel. The stator is provided on the inner wall of the housing, a first air duct parallel to the central line of the mounting channel is provided on the stator, a second air duct which is also parallel to the central line of the mounting channel is provided between the inner and outer walls of the housing, a first opening is provided on the outer wall of the housing, a second opening is provided on the first end cover, two ends of the first air duct and the second air duct are respectively in communication with the first opening and the second opening, and the air driving device drives air to flow in the first air duct and the second air duct. Compared with cases where air only flows in a single cooling channel, air can simultaneously flow in the first air duct and the second air duct, thereby improving the cooling effect of the motor.

Description

Ventilation and cooling structure of permanent magnet motor

Technical field

The invention relates to the technical field of motors, and in particular to a ventilation cooling structure for permanent magnet motors.

Background technique

The permanent magnet motor includes a casing, a stator, a rotor and a main shaft. The stator is arranged on the inner wall of the casing, the rotor is connected with the main shaft, and the rotor is arranged in the casing; when electrified, the rotor rotates to drive the main shaft to rotate.

In the related art, in order to avoid the accumulation of heat generated when the motor is working, resulting in excessive temperature, a cooling air duct is often arranged between the inner wall and the outer wall of the housing, and the first opening of the cooling air duct is arranged on the outer wall of the housing. The second opening of the cooling channel is provided at the front end of the housing along the direction parallel to the axis of the main shaft; a ventilation device is provided outside the housing of the motor. When the motor is working, the rotor drives the main shaft to rotate with electricity, and the ventilation device drives air to enter through the first opening. Into the cooling air duct, and a second opening flows out to cool the motor.

However, the air only flows in the cooling channel, and the cooling effect of the motor is not good.

Summary of the invention

The embodiment of the present invention provides a ventilation cooling structure for a permanent magnet motor to solve the technical problem that the air only flows in the cooling channel in the prior art, and the cooling effect of the motor is not good.

The embodiment of the present invention provides a permanent magnet motor ventilation and cooling structure, which includes a housing, a first end cover, a second end cover, a stator, and an air drive device; the housing is surrounded by an installation channel, and the first end cover Covering one end of the installation channel, and the second end cover covering the other end of the installation channel.

The stator is provided on the inner wall of the housing, the stator is provided with a first air channel parallel to the center line of the mounting channel, and a first air channel is provided between the inner wall of the housing and the outer wall of the housing. Two air ducts, the center line of the second air duct is parallel to the center line of the installation channel; the outer wall of the housing is provided with a first opening, the first end cover is provided with a second opening, so One end of the first air duct and the second air duct facing the second end cover communicates with the first opening, and the first air duct and the second air duct face the first end cover One end is in communication with the second opening; the air driving device is in communication with the first air channel and the second air channel, and is used to drive the air flow in the first air channel and the second air channel.

The ventilation and cooling structure for a permanent magnet motor as described above, wherein the stator and the second end cover are enclosed to form a first cavity, and the first air duct faces one end of the second end cover and the first cavity. A cavity is in communication, and the first cavity is in communication with the first opening;

The stator and the first end cover are enclosed to form a second cavity, and one end of the first air duct and the second air duct facing the first end cover is communicated with the second cavity, so The second cavity is in communication with the second opening.

The ventilation and cooling structure for a permanent magnet motor as described above, wherein, the first air ducts are multiple, and the multiple first air ducts are arranged at intervals around the center line of the installation channel; the second air duct is A plurality of, and a plurality of the second air ducts are arranged at intervals around the center line of the installation channel.

The ventilation and cooling structure for a permanent magnet motor as described above, wherein a first annular flange is provided on the inner wall of the second end cover, and a first sealing ring is provided between the first annular flange and the stator, The first sealing ring, the first annular flange, the second end cover and the housing surround a first cavity.

The ventilation and cooling structure for a permanent magnet motor as described above, wherein a second annular flange is provided on the inner wall of the first end cover, and a second sealing ring is provided between the second annular flange and the stator, The second sealing ring, the second annular flange, the first end cover and the housing surround a second cavity.

The ventilation and cooling structure for a permanent magnet motor as described above, wherein the first sealing ring includes a first sealing member and a first connecting portion, one end of the first connecting portion is fixedly connected to the first annular flange, and the other One end is connected to the first sealing element; the second sealing ring includes a second sealing element and a second connecting portion, one end of the second connecting portion is fixedly connected to the second annular flange, and the other end is connected to the The second seal is connected.

In the ventilation cooling structure of the permanent magnet motor as described above, the first sealing element and the second sealing element are both rubber parts.

The ventilation and cooling structure for a permanent magnet motor as described above, wherein the stator includes an iron core and a coil arranged on the iron core, the iron core is ring-shaped, and the first air duct is arranged on the iron core .

The ventilation and cooling structure of the permanent magnet motor as described above, wherein the inner wall of the casing is recessed to form the second air duct, and the outer wall of the iron core is attached to the inner wall of the casing.

The ventilation and cooling structure for a permanent magnet motor as described above, which further includes a rotor and a main shaft, the rotor is arranged in the housing, and the rotor is connected to the main shaft, and the main shaft is connected to the first end cover and The second end cover is rotatably connected; the first end cover is provided with a shaft hole, part of the main shaft extends from the shaft hole; the air driving device is provided outside the housing, the The air driving device is connected with an independent energy source, and is used to drive air to flow in the first air duct and the second air duct.

The ventilation and cooling structure of a permanent magnet motor provided by an embodiment of the present invention includes a housing, a first end cover, a second end cover, a stator, and an air drive device. The housing surrounds an installation channel, and the first end cover and the second end cover are respectively installed at both ends of the installation channel. A stator is provided on the inner wall of the housing, and a first air channel parallel to the center line of the installation channel is provided on the stator. A second air channel that is also parallel to the center line of the installation channel is provided between the inner and outer walls of the housing. The outer wall of the housing is provided with a first opening, and the first end cover is provided with a second opening. The two ends of the first air duct and the second air duct are respectively communicated with the first opening and the second opening, and the air driving device drives the air in the Flow in the first air duct and the second air duct. Compared with air only flowing in a single cooling channel, in the embodiment of the present invention, air can flow in the first air channel and the second air channel at the same time, thereby improving the cooling effect of the motor.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a ventilation cooling structure for a permanent magnet motor provided by an embodiment of the present invention;

Figure 2 is a right side view of a motor provided by an embodiment of the present invention;

Figure 3 is an enlarged schematic view of a first sealing ring provided by an embodiment of the present invention;

Fig. 4 is an enlarged schematic diagram of a second seal ring provided by an embodiment of the present invention.

Description of reference signs:

1: Shell;

11: The first opening;

12: The second air duct;

2: The first end cover;

21: The second opening;

22: The second annular flange;

23: The second sealing ring;

231: the second seal;

232: the second connecting part;

24: The second cavity;

3: The second end cover;

31: The first annular flange;

32: The first sealing ring;

321: The first seal;

322: the first connecting part;

33: The first cavity;

4: Stator;

41: The first air duct;

5: Rotor;

6: Spindle.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

In the present invention, unless expressly specified otherwise, the terms "installed", "connected", "connected", "fixed" and other terms should be interpreted broadly. For example, it may be a fixed connection or a detachable connection. Or integrally formed, which can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction between the two components, unless There are other clear restrictions. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations.

Fig. 1 is a schematic structural diagram of a ventilation cooling structure for a permanent magnet motor provided by an embodiment of the present invention; Fig. 2 is a right side view of a motor provided by an embodiment of the present invention. Please refer to Figs. 1 and 2.

The embodiment of the present invention provides a permanent magnet motor ventilation and cooling structure, including: a housing 1, a first end cover 2, a second end cover 3, a stator 4, and an air drive device. The housing 1 is surrounded by an installation channel. The end cover 2 covers one end of the installation channel, and the second end cover 3 covers the other end of the installation channel.

The stator 4 is arranged on the inner wall of the housing 1, a first air duct 41 parallel to the center line of the installation channel is provided on the stator 4, and a second air duct 12 is provided between the inner wall of the housing 1 and the outer wall of the housing 1 , The center line of the second air duct 12 is parallel to the center line of the installation channel, the outer wall of the housing 1 is provided with a first opening 11, the first end cover 2 is provided with a second opening 21, the first air duct 41 and the second The end of the second air duct 12 facing the second end cover 3 is in communication with the first opening 11, the end of the first air duct 41 and the second air duct 12 facing the first end cover 2 is in communication with the second opening 21, and the air driving device is connected to the first opening. An air duct 41 communicates with the second air duct 12 and is used to drive the air flow in the first air duct 41 and the second air duct 12.

The housing 1 is surrounded by a mounting channel, and the first end cover 2 and the second end cover 3 can both be connected to the housing 1 by means of bolts, and the three together constitute the outer shell of the motor. The shell 1, the first end cover 2 and the second end cover 3 can all be processed and manufactured by a casting molding process, and the materials used can be common cast metals such as cast iron or cast aluminum.

Optionally, a plurality of radiating fins may be provided on the housing 1 of the motor, so that the heat inside the motor can be dissipated through the radiating fins, and the cooling effect of the motor is further improved.

The stator 4 can be installed on the inner wall of the housing 1 by means of a thermal jacket. When the thermal jacket is used for installation, it is preferred that the outer diameter of the stator 4 is slightly larger than the inner diameter of the shell 1, and the shell 1 is heated during the thermal jacket. It expands after being heated. At this time, the inner diameter of the housing 1 is larger than the outer diameter of the stator 4. In this state, the stator 4 is installed inside the housing 1. After the housing 1 is cooled, its inner diameter is smaller than the outer diameter of the stator 4 again At this time, the stator 4 is firmly clamped by the inner wall of the housing 1, and the installation is completed. Alternatively, the stator 4 and the inner wall of the housing 1 can also be fixed together by bolts.

The first opening 11 opened on the housing 1 and the second opening 21 opened on the first end cover 2 are mainly used for the flow of air, and the shape can be regular or other irregular, such as square, circle, ellipse, etc. The shape is not limited in this embodiment.

Optionally, in addition to being parallel to the center line of the installation channel, the first air channel 41 and the second air channel 12 may also be inclined to the center line of the installation channel at a certain angle. The first air channel 41 and the second air channel 12 can be straight channels, or can also be set as curved air channels. The air flow in the curved air channel is longer than the straight channel, thereby providing better The cooling effect.

Exemplarily, in the permanent magnet motor provided in this embodiment, the rotor is a permanent magnet, which is connected to the first end cover 2 and the second end cover 3 by bolts at the openings at both ends of the installation channel, and the stator 4 is connected by the stator The stator core is composed of an iron core and a stator winding. The stator iron core is thermally sleeved on the inner wall of the housing 1, and a first air duct 41 is provided on the stator iron core, and a second air duct 12 and a first opening 11 are provided on the housing 1 The first end cover 2 is provided with a second opening 21, the end of the first air duct 41 facing the first end cover 2 can be communicated with the second opening 21 through a pipe, and the first air duct 41 faces the second end cover 3 One end is also connected to the first opening 11 through a pipe, so that air can flow from the first opening 11 into the first air passage 41 through the pipe. After passing through the first air passage 41, it finally flows out from the second opening 21. Similarly, the second The end of the air duct 12 facing the second end cover 3 directly communicates with the first opening 11, and the end of the second air duct 12 facing the first end cover 2 communicates with the second opening 21 through a pipe, so that air can directly pass through the first opening 11. It flows into the second air duct 12, passes through the second air duct 12, enters the pipe, and finally flows out through the second opening 21.

The ventilation and cooling process of the electric motor provided in this embodiment is as follows: the air driving device drives the air to flow, so that air flows in from the first opening 11, and a part of the air enters the first air duct 41 from the first opening 11, and then flows out from the second opening 21 When the air flows through the first air duct 41, it will exchange heat with the stator 4, and then carry the heat out to realize the heat dissipation of the stator 4; another part of the air flows into the second air duct from the first opening 11 12, and then flow out from the second opening 21. When the air flows through the second air duct 12, it will exchange heat with the casing 1, and then carry the heat out to realize the heat dissipation of the casing 1; A different air duct simultaneously cools and dissipates the motor.

It should be pointed out that the air driving device can also drive air from the second opening 21 into the first air duct 41 and the second air duct 12, and out of the first opening 11. The embodiment of the present invention does not limit the flow direction of the air.

In the ventilation and cooling structure of the permanent magnet motor provided in this embodiment, the housing 1 is surrounded by an installation channel, and the first end cover 2 and the second end cover 3 are respectively installed at both ends of the installation channel. A stator 4 is provided on the inner wall of the housing 1, and a first air duct 41 parallel to the center line of the installation channel is provided on the stator 4, and a second air duct 41 that is also parallel to the center line of the installation channel is provided between the inner and outer walls of the housing 1. The second air duct 12 is provided with a first opening 11 on the outer wall of the housing 1, and a second opening 21 is opened on the first end cover. The two ends of the first air duct 41 and the second air duct 12 are respectively connected to the first opening 11 In communication with the second opening 21, the air driving device drives air to flow in the first air duct 41 and the second air duct 12. Compared with the air flowing in a single cooling channel, the air in this embodiment can flow in the first air duct 41 and the second air duct 12 at the same time to take away the heat from the stator 4 and the housing 1, thereby improving The cooling effect of the motor.

Optionally, the stator 4 and the second end cover 3 are enclosed to form a first cavity 33, the end of the first air duct 41 facing the second end cover 3 communicates with the first cavity 33, and the first cavity 33 is connected to the first cavity 33. The opening 11 is communicated with the stator 4 and the first end cover 2 to form a second cavity 24. The first air duct 41 and the second air duct 12 are connected to the second cavity 24 at one end facing the first end cover 2. The cavity 24 is in communication with the second opening 21.

The first cavity 33 is surrounded by the stator 4 and the second end cover 3. A part of the side wall of the first cavity 33 is the side wall of the stator 4. When the air flows, the air contacts the side wall of the stator 4 and is taken away. Similarly, a part of the side wall of the second cavity 24 is also the side wall of the stator 4, and the heat on the side wall can also be taken away when the air flows, thereby improving the cooling effect of the stator 4.

This embodiment does not restrict the air flow direction inside the motor. For example, a part of the air enters the first cavity 33 from the first opening 11 under the driving of the air driving device, and then enters the first cavity 33 from the first cavity 33. An air duct 41 enters the second cavity 24 from the other end of the first air duct 41, another part of the air enters the second air duct 12 through the first opening 11, and then also enters the second cavity 24 , The air in the first air duct 41 and the air in the second air duct 12 converge inside the second cavity 24 and finally flow out from the second opening 21.

In this embodiment, the stator 4 and the second end cover 3 are enclosed to form a first cavity 33, the end of the first air duct 41 facing the second end cover 3 is communicated with the first opening 11 through the first cavity 33, and the stator 4 is connected to the first cavity 33. The first end cover 2 encloses a second cavity 24. The end of the first air duct 41 and the second air duct 12 facing the first end cover 2 is communicated with the second opening 21 through the second cavity 24, which utilizes the internal current of the motor. Some structures connect the first air duct 41 with the first opening 11 and the second opening 21, as well as the second air duct 12 and the second opening 21, and do not need to provide additional connecting parts. The structure is simple and reduces the installation time of the motor. Workload.

Optionally, there are a plurality of first air ducts 41, and the plurality of first air ducts 41 are arranged at intervals around the center line of the installation channel; there are multiple second air ducts 12, and the plurality of second air ducts 12 surround the installation channel. The setting of the centerline interval. The multiple first air ducts 41 and the second air ducts 12 can improve the cooling effect of the stator 4 and the housing 1.

In the case of ensuring the structural strength of the housing 1 and the stator 4, the specific number of the first air passage 41 and the second air passage 12 can be set according to the actual needs of the user, which is not limited in this embodiment.

Optionally, the first air duct 41 and the second air duct 12 can be arranged to be evenly spaced along the center line of the installation channel. At this time, the entire motor can dissipate heat evenly, or a non-equal space distribution method can also be used. For example, for an area with a large amount of heat accumulation, more first air ducts 41 and second air ducts 12 can be set compared to other areas, so as to improve the heat dissipation effect of this area.

In this embodiment, a plurality of first air ducts 41 and a second air duct 12 are arranged, and the plurality of first air ducts 41 and the plurality of second air ducts 12 are arranged at intervals around the center line of the installation channel, so that the motor as a whole is It can effectively dissipate heat and improve the local poor heat dissipation of the motor.

Optionally, a first annular flange 31 is provided on the inner wall of the second end cover 3, a first sealing ring 32 is provided between the first annular flange 31 and the stator 4, the first sealing ring 32, the first annular convex The rim 31, the second end cover 3 and the housing 1 surround a first cavity 33.

The first annular flange 31 is arranged on the inner wall of the second end cover 3 and extends toward the stator 4. One side of the first sealing ring 32 is connected with the first annular flange 31, and the other side is connected with the stator 4. Seal the gap between the stator 4 and the first annular flange 31, so that when the outside air enters the first cavity 33, it is blocked by the first sealing ring 32 and cannot enter the rotor 5 and the main shaft 6 of the motor further. This prevents the air from affecting the operation of the rotor.

In this embodiment, a first cavity 33 is enclosed by a first sealing ring 32, a first annular flange 31, a second end cover 3, and a housing 1. The first sealing ring 32 seals the stator 4 and the first annular flange 31 The gap makes the air flow inside the first cavity 33 and cannot further enter the rotor 5 and the spindle 6 of the motor, preventing dust and foreign matter entrained in the air from entering the rotor 5 and the spindle 6 of the motor, improving the operation of the motor The stability.

Optionally, a second annular flange 22 is provided on the inner wall of the first end cover 2, and a second sealing ring 23 is provided between the second annular flange 22 and the stator 4. The second sealing ring 23 and the second annular protrusion The rim 22, the first end cover 2 and the housing 1 surround a second cavity 24.

The second annular flange 22 is arranged on the inner wall of the first end cover 2 and extends toward the stator 4. One side of the second sealing ring 23 is connected with the second annular flange 22, and the other side is connected with the stator 4. The gap between the stator 4 and the second annular flange 22 is sealed to prevent external air from entering the interior of the rotor 5 and the main shaft 6 of the motor, thereby preventing the air from affecting the operation of the rotor.

In this embodiment, a second cavity 24 is enclosed by the second sealing ring 23, the second annular flange 22, the first end cover 2 and the housing 1. The second sealing ring 23 seals the stator 4 and the second annular flange 22 The gap between them prevents foreign matter or dust in the external air from entering the rotor 5 and the main shaft 6 of the motor, which improves the stability of the motor operation.

Fig. 3 is an enlarged schematic view of a first seal ring provided by an embodiment of the present invention; Fig. 4 is an enlarged schematic view of a second seal ring provided by an embodiment of the present invention. Continue to refer to Figures 3 and 4.

Optionally, the first sealing ring 32 includes a first sealing member 321 and a first connecting portion 322, one end of the first connecting portion 322 is fixedly connected to the first annular flange 31, and the other end is connected to the first sealing member 321; The second sealing ring 23 includes a second sealing member 231 and a second connecting portion 232. One end of the second connecting portion 232 is fixed to the second annular flange 22 and the other end is connected to the second sealing member 231.

The first connecting portion 322 has an annular shape. The inner surface of the ring and the end surface of the first annular flange 31 facing the stator 4 are fixed together by bolts. A clamping portion is provided on the outer surface of the first connecting portion 322. The bottom end of the sealing member 321 is provided with a clamping groove so as to be clamped on the clamping portion of the first connecting portion 322.

The second connecting portion 232 is also ring-shaped. The inner side of the ring and the end surface of the second annular flange 22 facing the stator 4 are fixed together by bolts. A clamping portion is provided on the outer surface of the second connecting portion 232. The bottom end of the second sealing member 231 is provided with a clamping groove so as to be clamped on the clamping portion of the second connecting portion 232.

Specifically, the clamping portion provided on the first connecting portion 322 may have a "T"-shaped structure, wherein the bottom end of the "T" shape extends vertically from the first connecting portion 322 toward the end surface of the first sealing member 321 . Correspondingly, a "T"-shaped groove is provided on the end surface of the first sealing member 321 facing the first connecting portion 322, and the "T"-shaped clamping portion can be inserted into the "T"-shaped groove, thereby realizing the first The sealing member 321 is clamped on the first connecting portion 322.

Optionally, the clamping portion on the first connecting portion 322 and the clamping groove on the first sealing member 321 may also have other structures, as long as it can be realized that the first sealing member 321 can be clamped on the first connecting portion 322 That is, this embodiment does not limit this.

The clamping groove provided on the second sealing member 232 can adopt the same arrangement as the clamping groove provided on the first sealing member 321, and similarly, the clamping portion provided on the second connecting portion 232 can also adopt the same arrangement as the clamping groove provided on the first sealing member 321. The clamping portions provided on the first connecting portion 322 are arranged in the same manner, thereby realizing the interchangeability of the first sealing member 321 and the second sealing member 232, which will not be repeated in this embodiment.

In this embodiment, the first sealing ring 32 is divided into two parts, the first sealing part 321 and the first connecting part 322, and the second sealing ring 23 is divided into two parts, the second sealing part 231 and the second connecting part 232. After the 321 or the second seal 322 is aged or damaged, the damaged seal can be directly disassembled and replaced with a new seal, which improves the convenience of subsequent production and maintenance.

Optionally, the first sealing element 321 and the second sealing element 231 are both rubber parts.

Rubber is a relatively common material for making sealing rings, and different types of rubber can be selected to adapt to the working conditions according to the requirements of different use environments. For example, the first seal 321 and the second seal 231 can be made of natural rubber, which has good wear resistance, elasticity and elongation; or, the first seal 321 and the second seal 231 can also be made of natural rubber. Made of polyurethane rubber, polyurethane rubber has good mechanical properties, high pressure resistance and abrasion resistance.

The first sealing element 321 and the second sealing element 231 of this embodiment are made of rubber material, and the processing technology is mature and the processing is simple, which effectively improves the production efficiency.

Specifically, the stator 4 includes an iron core and a coil arranged on the iron core. The iron core has a ring shape, and the first air duct 41 is arranged on the iron core.

The first air duct 41 and the coil on the iron core need to avoid each other to prevent the coil from blocking the first air duct 41. For example, the coil on the iron core can be arranged in the middle of the iron core, and the first air duct 41 can be arranged in the middle of the iron core. It is located close to the inner wall of the casing 1 so as to prevent the coil on the iron core from blocking the first air duct 41.

The stator 4 of this embodiment includes an iron core and a coil arranged on the iron core. The iron core is ring-shaped. The first air duct 41 is arranged on the stator iron core. When the air flows, the heat on the iron core can be taken away, which improves The cooling effect of the motor.

Optionally, the inner wall of the housing 1 is recessed to form a second air duct 12, and the outer wall of the iron core is attached to the inner wall of the housing 1.

When there are multiple second air passages 12, the inner wall of the housing 1 also needs to be provided with multiple recesses to form a second air passage.

It should be noted that the outer wall of the iron core and the inner wall of the housing 1 need to be completely attached to prevent air from flowing out of the second air duct 12 through the gap between the outer wall of the iron core and the inner wall of the housing 1.

In this embodiment, the second air duct 12 is composed of a casing 1 and an iron core. The inner wall of the casing 1 is recessed to form a groove, and the opening of the groove facing the stator 4 is sealed by the outer wall of the iron core, thereby forming a second wind The channel 12, this arrangement can effectively reduce the complexity of the structure of the housing 1, and facilitate the processing of the housing.

Optionally, the ventilation cooling structure of the permanent magnet motor provided in this embodiment further includes a rotor 5 and a main shaft 6. The rotor 5 is arranged in the housing 1, and the rotor 5 is connected to the main shaft 6, and the main shaft 6 is connected to the first end cover 2 and the The two end covers 3 are rotatably connected; the first end cover 2 is provided with a shaft hole, and part of the main shaft 6 extends from the shaft hole;

In this embodiment, the air driving device may be arranged outside the housing, and the air driving device includes an independent energy source connection and is used to drive air to flow in the first air duct 41 and the second air duct 12. Since the air drive device has an independent energy supply, it can continue to run after the motor stops working so as to continue to cool the motor that has not been completely cooled.

The stator 4 and the rotor 5 of the motor are both annular structures. The rotor 5 is sleeved inside the stator 4, the main shaft 6 is sleeved inside the rotor 5, and the rotor 5 and the main shaft 6 are connected together. When the rotor 5 rotates with electricity, it drives the main shaft 6 Rotate.

In another possible implementation of this embodiment, the air drive device may also include fan blades, which are in transmission connection with the rotor 5 or the main shaft 6. When the motor is working, the rotor 5 or the main shaft 6 rotates, and the fan blades The rotor 5 or the main shaft 6 rotates and drives the air to flow. For example, the air driving device is arranged on the main shaft 6 of the motor, and the fan blades are connected with the main shaft 6 by gear transmission. The main shaft 6 rotates when the motor is working, thereby driving the fan blades to rotate together, driving air in the first air duct 41 and the second air duct. Or, the air drive device can also be placed independently of the main shaft 6 and located close to the first opening 11 or the second opening 21. The fan blades of the air drive device are connected to the main shaft 6 through a transmission belt. 6 Drive the belt to rotate, and the belt drives the fan to rotate, so as to achieve the effect of the air driving device driving air flow. The ventilation cooling structure of the permanent magnet motor of this embodiment includes a rotor 5 and a main shaft 6. The rotor 5 is arranged inside the housing 1 and is connected to the main shaft 6. The main shaft 6 is driveably connected to the first end cover 2 and the second end cover 3 Together, part of the main shaft 6 protrudes through the shaft hole on the first end cover 2, and the fan blades of the air driving device are in transmission connection with the main shaft 6, and the rotation of the main shaft 6 drives the fan blades to drive air flow, which saves energy. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. range.

Claims

A ventilation and cooling structure for a permanent magnet motor, which is characterized by comprising: a housing, a first end cover, a second end cover, a stator, and an air drive device; the housing is surrounded by a mounting channel, and the first end cover Cover one end of the installation channel, and the second end cover covers the other end of the installation channel;

The stator is arranged on the inner wall of the housing, the stator is provided with a first air duct parallel to the center line of the mounting channel, and the inner wall of the housing and the outer wall of the housing are arranged between There is a second air duct, the center line of the second air duct is parallel to the center line of the installation channel; the outer wall of the housing is provided with a first opening, and the first end cover is provided with a second opening , The end of the first air duct and the second air duct facing the second end cover communicates with the first opening, and the first air duct and the second air duct face the first end One end of the cover is in communication with the second opening; the air driving device is in communication with the first air duct and the second air duct, and is used to drive the air in the first air duct and the second air duct flow.
The permanent magnet motor ventilation and cooling structure according to claim 1, wherein the stator and the second end cover are enclosed to form a first cavity, and the first air duct faces the second end cover. One end is in communication with the first cavity, and the first cavity is in communication with the first opening;

The stator and the first end cover are enclosed to form a second cavity, and one end of the first air duct and the second air duct facing the first end cover is communicated with the second cavity, so The second cavity is in communication with the second opening.
The permanent magnet motor ventilation and cooling structure according to claim 2, wherein there are a plurality of said first air ducts, and the plurality of said first air ducts are arranged at intervals around the center line of the installation channel; There are a plurality of second air ducts, and the plurality of second air ducts are arranged at intervals around the center line of the installation channel.
The permanent magnet motor ventilation and cooling structure according to claim 2, wherein a first annular flange is provided on the inner wall of the second end cover, and a first annular flange is provided between the first annular flange and the stator. The first sealing ring, the first sealing ring, the first annular flange, the second end cover and the housing surround a first cavity.
The permanent magnet motor ventilation and cooling structure according to claim 4, wherein a second annular flange is provided on the inner wall of the first end cover, and a second annular flange is provided between the second annular flange and the stator. The second sealing ring, the second sealing ring, the second annular flange, the first end cover and the housing surround a second cavity.
The ventilation and cooling structure of a permanent magnet motor according to claim 4 or 5, wherein the first sealing ring comprises a first sealing element and a first connecting portion, and one end of the first connecting portion is connected to the first The annular flange is fixedly connected, and the other end is connected with the first sealing element; the second sealing ring includes a second sealing element and a second connecting portion, and one end of the second connecting portion is connected to the second annular flange The other end is fixedly connected with the second sealing member.
The ventilation cooling structure of a permanent magnet motor according to claim 6, wherein the first sealing element and the second sealing element are both rubber parts.
The ventilation cooling structure for a permanent magnet motor according to any one of claims 1-5, wherein the stator includes an iron core and a coil arranged on the iron core, the iron core is ring-shaped, and the second An air duct is arranged on the iron core.
The permanent magnet motor ventilation and cooling structure according to claim 6, wherein the inner wall of the casing is recessed to form the second air duct, and the outer wall of the iron core is attached to the inner wall of the casing.
The permanent magnet motor ventilation and cooling structure according to any one of claims 1-5, further comprising a rotor and a main shaft, the rotor is arranged in the housing, and the rotor is connected to the main shaft, so The main shaft is rotatably connected with the first end cover and the second end cover; the first end cover is provided with a shaft hole, and part of the main shaft extends from the shaft hole;

The air driving device is arranged outside the housing, and the air driving device is connected to an independent energy source and is used to drive air to flow in the first air duct and the second air duct.