WO2023065404A1

WO2023065404A1 - Active air supply cooling permanent magnet motor and electric locomotive

Info

Publication number: WO2023065404A1
Application number: PCT/CN2021/128628
Authority: WO
Inventors: 黄鹏程; 张道禄; 刘勇; 唐赢武; 李金星; 郑国丽; 李广; 余超
Original assignee: 中车株洲电机有限公司
Priority date: 2021-10-22
Filing date: 2021-11-04
Publication date: 2023-04-27
Also published as: CN113937953A

Abstract

An active air supply cooling permanent magnet motor. A stator exhaust duct is formed in a stator shell; a shaft air inlet channel is formed in a rotating shaft in the axial direction; an air inlet end of the shaft air inlet channel communicates with the outside; a shaft air outlet channel is formed on the inner wall of the rotating shaft; the air inlet end of the shaft air inlet channel and the stator exhaust duct are located at the two ends of a rotor inner core, respectively; an outer rotor fan is located in the stator exhaust duct; and when the outer rotor fan rotates, a negative pressure is generated in an area where the outer rotor fan is located, the power for air flowing is formed, and external airflow enters from the air inlet end of the shaft air inlet channel, flows through the shaft air inlet channel, can enter the stator exhaust duct through the shaft air outlet channel, and enters the outside through the stator exhaust duct. Heat exchange occurs when airflow passes through the interior of the rotating shaft, part of heat generated in the rotating shaft can be brought out, compared with a traditional stator shell cooling mode, and the cooling efficiency can be improved, and the cooling effect in the motor is improved. The electric locomotive involved in the present invention can achieve the same technical effect.

Description

Active air supply cooling permanent magnet motor and electric locomotive

This application claims the priority of the Chinese patent application with the application number 202111233199.9 and the title of the invention "An Active Air Cooling Permanent Magnet Motor and Electric Locomotive" submitted to the China Patent Office on October 22, 2021, the entire contents of which are incorporated by reference incorporated in this application.

technical field

The invention relates to the field of motors, and further relates to an active air-supply cooling permanent magnet motor. In addition, the invention also relates to an electric locomotive.

Background technique

Rail locomotives are powered by permanent magnet motors. Conventional self-cooling motors are cooled through the air ducts opened in the stator shell. During operation, the cooling air generated by the rotor fan enters the stator air ducts from the non-drive end cover and flows along the The stator air duct axially reaches the air outlet on the end cover of the transmission end or the middle end cover, and the air outlet discharges the air duct from the air outlet to take away the heat from the stator shell of the motor.

This conventional external fan self-cooling motor only dissipates heat through the cooling air in the stator air duct, so that the heat inside the motor cannot be effectively dissipated, and the inside of the motor easily becomes an isothermal body. The internal heat of the motor is conducted, convected and radiated among various parts. The temperature at the end of the stator coil, the permanent magnet and the bearing will all be high, and the temperature limits of the coil, bearing and permanent magnet are different, which limits the power of the motor. The play, especially the motor with high torque density, high power density and compact structure.

For those skilled in the art, how to better cool the inside of the motor is a technical problem to be solved at present.

Contents of the invention

The invention provides an active air-supply cooling permanent magnet motor. The external cooling airflow is powered by the rotation of an air intake fan. Heat exchange occurs when the airflow passes through the inside of the rotating shaft, which can take out part of the heat generated inside, accelerate the cooling efficiency, and improve the cooling efficiency. The cooling effect inside the motor, the specific scheme is as follows:

An active air-supply cooling permanent magnet motor, comprising a stator casing, a rotor inner core, a rotating shaft, and a rotor outer fan, the rotor inner core and the rotating shaft are relatively fixed in the circumferential direction, and the rotating shaft is rotatably mounted on the stator casing through a bearing ; The rotor outer fan is fixed on the rotor inner core; a stator exhaust duct is set in the stator shell; the rotor outer fan is located in the stator exhaust duct;

A shaft air inlet passage is set up inside the rotating shaft along the axial direction, and the air inlet end of the shaft air inlet passage communicates with the outside world; a shaft air outlet passage is provided on the pipe wall of the rotating shaft; The stator exhaust ducts are respectively located at both ends of the rotor inner core;

The outer fan of the rotor rotates with the inner core of the rotor to form a negative pressure, and the external airflow enters from the inlet end of the shaft air intake channel, enters the stator exhaust channel through the shaft air outlet channel, and flows from the stator The exhaust duct is exhausted to the outside world.

Optionally, the rotor inner core is provided with a rotor outer ventilation channel axially; the shaft air outlet channel is provided with two groups, and the two groups of shaft air outlet channels are respectively located at both ends of the rotor inner core;

The gas discharged from the shaft outlet channel near the intake end flows through the rotor outer air channel, and is discharged into the stator exhaust channel;

The gas discharged from the shaft air outlet channel away from the intake end is directly discharged into the stator exhaust channel.

Optionally, a stator air inlet is provided on the side wall of the stator housing close to the air intake end, and the stator air inlet faces the rotor outer air passage; the air flow from the outside flows into the rotor outer air passage through the stator air inlet. road.

Optionally, a partition plate is provided on the inner wall of the stator housing, and the partition plate is slidably connected to the rotor inner core to form an internal sealed cavity and an external ventilation cavity, and the air flow from the outside can flow into the external ventilation cavity, and finally Into the stator exhaust duct to discharge.

Optionally, the rotor core is provided with an internal circulation fan, and the internal circulation fan rotates synchronously with the rotor core to circulate the gas in the internal sealed cavity.

Optionally, the rotor inner core is axially penetrated with a rotor inner circulation air duct, the rotor inner circulation air duct is located in the inner sealed cavity, and the rotor inner circulation air duct is facing the inner circulation fan, so The circulating airflow generated by the internal sealed cavity passes through the internal circulating air duct of the rotor.

Optionally, a stator internal circulation air channel is provided in the stator housing, and the stator internal circulation air channel is located between the inner wall of the stator housing and the stator core, or is independently arranged on the stator core itself, and the internal sealing The circulating airflow generated by the cavity passes through the circulating air duct in the stator.

Optionally, the rotating shaft is circumferentially fixedly connected to an air intake external fan;

The stator casing is provided with a stator heat dissipation air passage along the direction of the outer surface. Driven by the air intake external fan, the outside air enters the heat dissipation air passage from the air inlet end and is discharged from the air outlet end. heat exchange with the stator housing.

Optionally, the air intake external fan is provided with a fan vent directly opposite the stator air intake and/or the air intake end cover of the stator casing is provided with a fixed air intake cover.

The invention also provides an electric locomotive, including the active air-supply cooling permanent magnet motor described in any one of the above.

The invention provides an active air-supply cooling permanent magnet motor. The rotating shaft is installed on the stator shell through the bearing rotation, and the rotor inner core and the rotor outer fan are all synchronously rotating with the rotating shaft; the stator air duct is opened inside the stator shell; A shaft air intake channel is opened in the direction, and the air intake end of the shaft air intake channel communicates with the outside world; a shaft air outlet channel is provided on the inner wall of the rotating shaft; the air intake end of the shaft air intake channel and the stator air exhaust channel are respectively located at both ends of the rotor inner core; The outer fan of the rotor is located in the exhaust duct of the stator. When the outer fan of the rotor rotates, it generates negative pressure in the area where it is located, forming the power of gas flow. It can enter the stator exhaust channel from the shaft outlet channel, and enter the outside world from the stator exhaust channel; heat exchange occurs when the air flow passes through the inside of the rotating shaft, which can take out part of the heat generated inside. Compared with the traditional way of cooling through the stator shell, it can Accelerate the cooling efficiency and improve the cooling effect inside the motor. The electric locomotive involved in the present invention can achieve the same technical effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the sectional view along the axial direction of the active air-supply cooling permanent magnet motor provided by the present invention;

Fig. 2 is a schematic cross-sectional view of the upper half of Fig. 1 .

The picture includes:

Stator shell 1, stator exhaust duct 11, stator air inlet 12, partition plate 13, cooling air duct 14, stator internal circulation air duct 15, rotor inner core 2, rotor outer air duct 21, internal circulation fan 22, rotor Inner circulation air duct 23, rotor outer fan 24, rotating shaft 3, shaft air intake passage 31, shaft air outlet passage 32, air intake outer fan 4, fan vent 41, air intake cover 5.

Detailed ways

The core of the present invention is to provide an active air-supply cooling permanent magnet motor. The external cooling airflow is powered by the rotation of the air intake fan, and heat exchange occurs when the airflow passes through the inside of the rotating shaft, which can take out part of the heat generated inside and accelerate cooling. Efficiency, improve the cooling effect inside the motor.

In order to enable those skilled in the art to better understand the technical solution of the present invention, the active air-supply cooling permanent magnet motor and electric locomotive of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

As shown in Figure 1, it is a sectional view of the active air cooling permanent magnet motor provided by the present invention along the axial direction; Figure 2 is a schematic diagram of the upper half of Figure 1; the active air cooling permanent magnet motor of the present invention includes a stator housing 1, Rotor inner core 2, rotating shaft 3, rotor outer fan 24 and other structures. The rotor inner core 2 and the rotating shaft 3 are relatively fixed in the circumferential direction, and the rotating shaft 3 and the rotor inner core 2 keep rotating synchronously in the circumferential direction.

The rotating shaft 3 is installed on the stator housing 1 through bearing rotation. There are at least two bearings, which are respectively located at the positions opposite to the rotating shaft 3 on the side walls at both ends of the stator housing 1. The rotor core 2 and the rotating shaft 3 rotate synchronously relative to the stator housing 1. The bearings reduce Resistance when turning small. As shown in Figure 1, the stator shell 1 corresponds to the stator core A, and the rotor inner core 2 corresponds to the rotor core B. When the power is on, the electromagnetic force generated between the rotor core B and the stator core A forms a rotational torque. , to drive the rotor inner core 2 and the rotating shaft 3 to rotate synchronously.

A stator exhaust duct 11 is arranged inside the stator housing 1 , and both ends of the stator exhaust duct 11 are provided through, and one end thereof is communicated with the outside world. The rotor outer fan 24 is located in the stator exhaust duct 11, the rotor outer fan 24 is fixed on the rotor inner core 2, and the rotor outer fan 24 and the rotor inner core 2 keep synchronous rotation; when the rotor outer fan 24 rotates, the air is sent out to make it The stator exhaust duct 11 where it is located generates negative pressure, and the outside air supplements the stator exhaust duct 11 to generate the power of gas flow through the rotor outer fan 24 .

The interior of the rotating shaft 3 is provided with a shaft air intake channel 31 along the axial direction, and the length direction of the shaft air intake channel 31 is along the axial direction of the rotating shaft 3, and the shaft air intake channel 31 is a hollow channel structure; one end of the shaft air intake channel 31 communicates with the outside as At the air intake end, the external airflow can enter the shaft air intake channel 31 through the air intake port; the shaft air outlet channel 32 is set on the tube wall of the rotating shaft 3, and the direction of the shaft air outlet channel 32 is towards the stator exhaust channel 11, and the shaft air outlet channel 32 It can be perpendicular to the axial direction of the rotating shaft 3 (the structure shown in the figure), and can also form an acute angle with the axis of the rotating shaft 3. This acute angle refers to the folder where the airflow flows along the axial direction of the rotating shaft 3 and turns when it is discharged through the shaft outlet channel 32. The angle is acute. These specific configuration forms should be included within the protection scope of the present invention.

The air intake end of the shaft air intake passage 31 and the stator air exhaust duct 11 are located at both ends of the rotor inner core 2 respectively. The exhaust duct 11 is located on the left side of the rotor inner core 2, and correspondingly, the shaft outlet channel 32 and the stator exhaust duct 11 are located on the same side of the rotor inner core 2, that is, the shaft outlet channel 32 and the stator exhaust duct 11 are both located in the figure. Located on the left side of rotor core 2.

The air flow of the outside enters from the air intake end of the shaft air intake passage 31, enters the stator exhaust duct 11 through the shaft air outlet passage 32, and enters the outside world from the stator exhaust duct 11; when the active air supply cooling permanent magnet motor of the present invention is working, The rotor inner core 2 and the rotating shaft 3 keep rotating synchronously, which drives the rotor outer fan 24 to rotate synchronously. When the rotor outer fan 24 rotates, a negative pressure is formed to generate an airflow, so that the external airflow enters the shaft air intake channel 31 from the air intake end, as shown in Figure 1 The arrow indicated by the middle mark ①, the process of the airflow flowing along the shaft air intake channel 31 can exchange heat with the rotating shaft 3, and the heat of the rotating shaft 3 is transferred to the airflow, reducing the temperature of the rotating shaft 3. After that, the air flow is discharged from the shaft air outlet passage 32, enters the stator air discharge passage 11 and is discharged to the outside, and the heat is taken out to the outside. As shown in Figure 1, the air flow enters the shaft 3 from the right side of the rotor core 2, and exits the shaft 3 from the left side of the rotor core 2, which has a good auxiliary heat dissipation effect on the shaft 3, thereby achieving the internal cooling of the motor. cooling effect.

On the basis of the above scheme, the rotor inner core 2 of the present invention is provided with a rotor outer air duct 21 penetrating in the axial direction, the rotor outer air duct 21 is opened through the rotor inner core 2, and the penetration direction of the rotor outer air duct 21 is parallel to the rotating shaft 3 The direction of the axis allows airflow to pass through. A plurality of rotor outer air passages 21 are arranged in parallel, and each rotor outer air passage 21 can allow air flow to pass through independently.

In this regard, the shaft outlet passages 32 of the present invention are provided in two groups, and the two groups of shaft outlet passages 32 are respectively located at both ends of the rotor inner core 2; the number of the shaft outlet passages 32 is opposite to the number of the rotor outer air passages 21. As shown in the figure, two rotor outer ventilation ducts 21 are shown in the figure, and a set of shaft air outlet channels 32 are arranged on the left and right sides of the rotor inner core 2, and each set of shaft air outlet channels 32 on the left and right sides includes two upper and lower channels, each The channels are capable of exhausting airflow outwards.

The gas discharged from the shaft outlet channel 32 near the intake end flows through the rotor outer air channel 21 and is discharged into the stator exhaust channel 11; the gas discharged from the shaft outlet channel 32 away from the intake end is directly discharged into the stator exhaust channel 11.

As shown in Fig. 1, when in use, the airflow enters the shaft air intake passage 31 from the right side, and when a part of the airflow does not reach the corresponding position of the rotor inner core 2, it is first discharged from the shaft air outlet passage 32 on the right side, and then enters the rotor outside The air channel 21 flows through the rotor inner core 2 along the rotor outer air channel 21 , exchanges heat with the rotor inner core 2 , absorbs the heat of the rotor inner core 2 , and cools the rotor inner core 2 . After the air flow is discharged from the rotor outer air duct 21, it flows into the stator exhaust duct 11, and is exhausted from the stator exhaust duct 11 to the outside.

The other part of the air flow flowing along the shaft air inlet channel 31 is discharged from the shaft air outlet channel 32 on the left side. This part of the air flow mainly absorbs the heat of the shaft 3 and is discharged into the stator exhaust duct 11; the two air streams flow through the shaft 3 and the rotor respectively. The cores 2 respectively have respective cooling effects.

Furthermore, in the present invention, a stator air inlet 12 is provided on the side wall of the stator housing 1 close to the air intake end, and the stator air inlet 12 is provided through the side wall of the stator housing 1, and its penetration direction is parallel to the axial direction of the rotating shaft 3, and the stator The air inlet 12 faces the rotor outer air passage 21; the outside air flows into the rotor outer air passage 21 through the stator air inlet 12; as shown in Fig. 1, part of the air flow entering the rotor outer air passage 21 comes from the shaft air outlet passage on the right side 32. The other part comes from the direct inflow of external air through the stator air inlet 12, further increasing the air flow through the rotor core 2 and improving the cooling efficiency of the rotor core 2.

Preferably, in the present invention, a partition plate 13 is provided on the inner wall of the stator housing 1, the partition plate 13 is slidably connected to the rotor core 2, the partition plate 13 and the rotor core 2 are in sealing contact, and the internal sealed cavity and the The external airflow can flow into the external ventilation cavity, and finally enter the stator exhaust duct 11 to be discharged; while the internal sealing cavity is not in contact with the outside world, and the external air cannot enter the internal sealing cavity, and the motor stator is located in the internal sealing cavity. The external ventilation cavity is composed of the stator exhaust duct 11, the rotor outer air duct 21, the stator air inlet 12 and other parts, and the external air flow can flow through and dissipate heat.

Furthermore, the present invention sets an internal circulation fan 22 on the rotor inner core 2, and the internal circulation fan 22 can rotate synchronously with the rotor inner core 2 to circulate the gas in the inner sealed cavity; the gas in the inner sealed cavity does not communicate with the outside world, Driven by the internal circulation fan 22 , the internal air flow independently forms a circulating flow, so that the internal distribution is uniform, and the high-temperature air is brought to the outer wall of the stator housing 1 to improve the heat dissipation effect. The internal circulation fan 22 is fixed on the mounting plate provided on the rotor inner core 2 , the mounting plate forms the side wall of the stator exhaust duct 11 , and the mounting plate and the partition plate 13 cooperate with each other in sealing contact.

Specifically, the rotor inner core 2 is provided with a rotor internal circulation air passage 23 axially, the penetration direction of the rotor internal circulation air passage 23 is parallel to the axial direction of the rotating shaft 3, the rotor internal circulation air passage 23 is located in the inner sealing cavity, and the rotor internal circulation The air duct 23 is facing the inner circulation fan 22, and the circulating airflow generated by the inner sealed cavity passes through the rotor inner circulation air duct 23; when the air flow flows through the rotor inner circulation air duct 23, the contact area with the rotor inner core 2 is increased, and the heat is accelerated transmission.

The stator internal circulation air duct 15 is arranged in the stator housing 1, and the penetration direction of the stator internal circulation air duct 15 is parallel to the axial direction of the rotating shaft 3. The stator internal circulation air duct 15 has two setting methods: the first one, the stator internal circulation air duct 15 is located between the inner wall of the stator shell 1 and the stator core; the second type, the stator internal circulation air duct 15 is independently arranged on the stator core itself, and the through passage is set by the structure of the stator core itself; the circulation generated by the internal sealed cavity The air flow passes through the circulating air duct 15 in the stator. The flow path of the airflow in the inner sealed chamber is shown by the arrow ② in Figure 1. When the airflow circulates inside, it passes through the rotor inner circulation air duct 23 and the stator inner circulation air duct 15 in turn, and the gas flows through the stator inner circulation air duct At 15 o'clock, heat exchange occurs, and the heat is dissipated to the outside through the side wall of the stator housing 1 .

On the basis of any of the above-mentioned technical solutions and their mutual combinations, the present invention fixedly connects the air intake external fan 4 in the circumferential direction of the rotating shaft 3, and the air intake external fan 4 is located at the end where the air intake end of the shaft air intake channel 31 is located, and further The outer air fan 4 is exposed on the outer surface of the stator casing 1, the air intake outer fan 4 and the rotating shaft 3 keep rotating synchronously in the circumferential direction, and the air intake outer fan 4 can generate air flow when rotating.

The stator housing 1 is provided with a stator cooling duct 14 along the direction of the outer surface. As shown in FIG. 1 , the stator cooling duct 14 is not a straight structure, but has a circular arc-shaped transition section, which is roughly the same as the appearance trend of the stator housing 1. The outside air enters the heat dissipation air duct 14 from the air inlet end and is discharged from the air outlet end. When the air flow passes through the stator heat dissipation air duct 14, heat exchange occurs with the stator housing 1; the stator heat dissipation air duct 14 is an interlayer provided outside the stator housing 1 The structure can guide the airflow to pass through. When the air intake fan 4 rotates, it drives the airflow into the stator heat dissipation air duct 14 to absorb the heat emitted from the inner sealed cavity, and further enhance the cooling and heat dissipation effect of the stator shell 1. The direction of the airflow in the stator heat dissipation air duct 14 is shown by the arrow indicated by the mark ③ in the figure.

Preferably, a fan vent 41 is provided at the position where the air intake outer fan 4 is facing the stator air inlet 12 , and the airflow flowing through the stator air inlet 12 is increased through the fan vent 41 . Because the air intake outer fan 4 is constantly rotating during work, a plurality of fan vents 41 can be provided in the circumferential direction, and the stator air inlet 12 and the fan vent 41 are axially opposite, and the distance between the two is equated from the rotating shaft.

A fixed air intake cover 5 is provided on the air intake end cover of the stator housing 1, and a number of finely arranged small holes are provided in the air intake cover 5. The air intake cover 5 plays the role of filtering impurities, and blocks the impurities contained in the air to prevent Damage is caused to the air intake outer fan 4, and small particles of impurities are also prevented from entering the inside of the motor.

The present invention also provides an electric locomotive, including the above-mentioned active air-supply cooling permanent magnet motor, and the electric locomotive can achieve the same technical effect. The motor of the electric locomotive is forced to blow air through the air intake outer fan 4, which can realize ventilation and cooling of the rotating shaft 3, the rotor inner core 2, and the stator shell 1 at the same time, and enhance the cooling effect inside the motor.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not 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

An active air-supply cooling permanent magnet motor is characterized in that it comprises a stator casing (1), a rotor inner core (2), a rotating shaft (3), a rotor outer fan (24), the rotor inner core (2) and the The rotating shaft (3) is relatively fixed in the circumferential direction, and the rotating shaft (3) is rotatably mounted on the stator casing (1) through bearings; the rotor outer fan (24) is fixed on the rotor inner core (2); A stator exhaust duct (11) is arranged in the stator housing (1); the rotor outer fan (24) is located in the stator exhaust duct (11);

The interior of the rotating shaft (3) is provided with a shaft air inlet passage (31) in the axial direction, and the air inlet end of the shaft air inlet passage (31) communicates with the outside world; the tube wall of the rotating shaft (3) is provided with a shaft air outlet passage ( 32); the air intake end of the shaft air intake channel (31) and the stator air exhaust channel (11) are respectively located at both ends of the rotor inner core (2);

The rotor outer fan (24) rotates with the rotor inner core (2) to form a negative pressure, and the external airflow enters from the inlet end of the shaft air intake channel (31), passes through the shaft air outlet channel (32) Enter the stator exhaust duct (11), and be discharged to the outside from the stator exhaust duct (11).
The active air-supply cooling permanent magnet motor according to claim 1, characterized in that, the rotor inner core (2) is axially penetrated with a rotor outer air passage (21); the shaft air outlet passage (32) is provided with two group, the two groups of shaft outlet passages (32) are respectively located at both ends of the rotor inner core (2);

The gas discharged from the shaft outlet channel (32) near the intake end flows through the rotor outer air channel (21) and is discharged into the stator air exhaust channel (11);

The gas discharged from the shaft outlet channel (32) away from the intake end is directly discharged into the stator exhaust channel (11).
The active air-supply cooling permanent magnet motor according to claim 2, characterized in that, the stator housing (1) is provided with a stator air inlet (12) on the side wall near the air inlet end, and the stator air inlet (12) Towards the rotor outer air passage (21); the air flow from outside flows into the rotor outer air passage (21) through the stator air inlet (12).
The active air-supply cooling permanent magnet motor according to claim 3, characterized in that, the inner wall of the stator housing (1) is provided with a partition plate (13), and the partition plate (13) is slidably connected to the inside of the rotor. The core (2) separates and forms an inner sealed cavity and an outer ventilation cavity, and the air flow from the outside can flow into the outer ventilation cavity, and finally flow into the stator exhaust duct (11) for discharge.
According to claim 4, the active air-supply cooling permanent magnet motor is characterized in that, the rotor core (2) is provided with an internal circulation fan (22), and the internal circulation fan (22) follows the rotor core ( 2) Synchronously rotate to circulate the gas in the inner sealed cavity.
The active air-supply cooling permanent magnet motor according to claim 5, characterized in that, the rotor inner core (2) is axially penetrated with a rotor inner circulation air duct (23), and the rotor inner circulation air duct (23 ) is located in the internal sealed cavity, the rotor internal circulation air duct (23) is facing the internal circulation fan (22), and the circulating airflow generated by the internal sealed cavity passes through the rotor internal circulation air duct (23).
The active air-supply cooling permanent magnet motor according to claim 6, characterized in that, a stator inner circulation air duct (15) is set inside the stator shell (1), and the stator inner circulation air duct (15) is located in the Between the inner wall of the stator shell (1) and the stator iron core, or independently arranged on the stator iron core itself, the circulating airflow generated by the inner sealed cavity passes through the stator inner circulating air duct (15).
According to the active air-supply cooling permanent magnet motor according to any one of claims 1 to 7, it is characterized in that the rotating shaft (3) is circumferentially fixedly connected to an air intake external fan (4);

The stator casing (1) is provided with a stator heat dissipation air duct (14) through the direction of the outer surface, driven by the air intake external fan (4), the outside air enters the heat dissipation air duct (14) from the air inlet end , and discharged from the air outlet, and the air flow passing through exchanges heat with the stator casing (1).
According to claim 8, the active air-supply cooling permanent magnet motor is characterized in that, the fan vent (41) and/or the position of the air intake outer fan (4) facing the stator air inlet (12) are set The air intake end cover of the stator housing (1) is provided with a fixed air intake cover (5).
An electric locomotive, characterized by comprising the active air-supply cooling permanent magnet motor according to any one of claims 1 to 9.