CN106230143B - A switched reluctance motor - Google Patents

Abstract

The invention discloses a kind of switched reluctance machines, including stator structure, shaft, the rotor connecting with the shaft；The stator structure generally sealing structure, including stator core, the winding that is surrounded on the stator core periphery, cover in shell outside the stator core, and the connecting cylinder to form seal chamber is connect with the shell, the stator core and winding are surrounded in the seal chamber, and the evaporative cooling liquid that damping action power is generated to the vibration of the stator core and winding is packaged in the seal chamber.Using this structure, since stator core is the main component for issuing vibration and noise, and stator core is immersed in the liquid of insulation, the liquid forms great frictional resistance to any movement tendency of stator, also with regard to the vibration of damping vibration attenuation stator, in addition the propagation of sound can be also prevented, therefore vibration damping, noise reduction effect are obvious.

Description

A switched reluctance motor

The present invention is a divisional application whose original application number is 201410127817.5, the original application date is March 31, 2014, and the original name of the invention is a switched reluctance motor.

technical field

The present invention relates to the technical field of motors, in particular to a switched reluctance motor.

Background technique

Electric vehicles are vehicles that use electricity to completely replace petroleum fuels, and have absolute advantages in environmental protection, cleanliness, and energy conservation. The driving motors of electric vehicles mainly include DC motors, asynchronous motors, permanent magnet brushless motors and switched reluctance motors. Switched reluctance motor has become a strong competitor of various drive systems due to its simple structure, low cost, strong applicability, and wide speed regulation range.

As shown in FIG. 1 , the figure is a schematic structural diagram of a switched reluctance motor in the prior art. When the control switches S1 and S2 of the A-phase winding 2' current are closed, the A-phase is energized, while the B-phase and C-phase are not energized, and the A-phase excitation generates a magnetic field. Because the magnetic flux of the motor is always closed along the path with the smallest reluctance, And when the axis of the magnetic pole of phase A coincides with the axis of the magnetic pole a of the rotor 7', the magnetic resistance of the magnetic circuit is the smallest, so the twisted magnetic field line produces a tangential pulling force, trying to make a-a' coincide with A-A', and finally rotate to a - Stop rotation where a' coincides with A-A'. Then, to make the motor rotate continuously, it is necessary to energize the B-phase, and at the same time, the A-phase and C-phase are de-energized. At this time, the magnetic field in the motor becomes a magnetic field with the axis of the B-phase magnetic pole, and the motor rotor 7' will continue to rotate until Fully coincident with BB'. Then the C phase is energized, and the A and B phases are de-energized at the same time. At this time, the magnetic field in the motor becomes a magnetic field with the C-phase magnetic pole axis, and the motor rotor 7' will continue to rotate until it completely coincides with C-C'. This repeated cycle, as long as the three-phase stator windings 2' are energized in the order of A-B-C-A..., the rotor 7' of the motor will always rotate in the same direction around the center line of the rotating shaft 8'.

It can be seen from the above working process that the electromagnetic torque generated by the switched reluctance motor is not stable like the electromagnetic torque of the traditional AC and DC motors, but is of a pulsating nature. The corresponding magnetic pull is not only tangential, but also There are radial ones, in which it is the tangential component of the magnetic pulling force that pulls the motor to run. Because of its pulsating nature, the motor runs unstable, produces deformation and vibration, and then produces serious noise. The radial component of the magnetic pulling force will change with the position of the rotor 7' and the current of the stator winding 2', thereby causing the deformation and vibration of the stator iron core 1' of the motor, and furthermore serious noise.

In view of this, it is urgent to address the above technical problems, and further optimize the design of the switched reluctance motor in the prior art to eliminate vibration and noise generated by the stator iron core, and to enhance the working stability of the switched reluctance motor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a switched reluctance motor, the stator structure of which is an integrally sealed structure, the stator core and the windings are enclosed in a sealed cavity, and the evaporative cooling liquid is encapsulated in the sealed cavity, which can reduce vibration and noise. Enhance the working stability of the switched reluctance motor.

In order to solve the above technical problems, the present invention provides a switched reluctance motor, which includes a stator structure, a rotating shaft, and a rotor connected to the rotating shaft; the stator structure is a sealed structure as a whole, including a stator iron core, surrounding the stator iron A winding on the outer periphery of the core, a casing covered outside the stator core, and a connecting cylinder connected with the casing to form a sealed cavity, the stator core and the windings are enclosed in the sealed cavity, and the sealed cavity The evaporative cooling liquid which produces damping force to the vibration of the stator iron core and the winding is encapsulated inside.

With this structure, since the evaporative coolant is a low-boiling, high-insulation, non-combustible evaporative coolant, when the motor is running, the windings, stator cores, and other structural components generate a lot of heat due to various losses, so that they are filled with heat. The temperature of the surrounding evaporative cooling liquid increases until it reaches the saturation temperature of the liquid medium corresponding to the pressure in the cavity, starts to boil, and then absorbs heat and vaporizes into a two-phase state of gas and liquid, so that the heating components can be fully cooled. During the boiling heat exchange, the temperature of the boiling working medium is basically distributed near the saturation temperature point, so that the temperature distribution of each stator part soaked by the medium is relatively uniform, especially the stator end has no local hot spot. The vapor cooling liquid in the two-phase state of gas and liquid, whose density is lower than that of the liquid medium, generates buoyancy and rises up to meet the condenser at the top, transfers heat to the condensed water in it, condenses into liquid and drips back to the original place, This achieves self-circulating, noise-free evaporative cooling at room temperature. Most importantly, since the stator core is the main component that emits vibration and noise, and the stator core is immersed in an insulating liquid, the liquid forms a great frictional resistance to any movement trend of the stator, which dampens the vibration of the stator. In addition, it will also prevent the transmission of sound, so the vibration reduction and noise reduction effect is obvious.

Preferably, the connecting cylinder is cylindrical, the connecting cylinder is integrally arranged between the rotor and the stator core, and both axial ends of the connecting cylinder are connected to the casing.

Preferably, the connecting cylinder axially connects the stator core and the casing, the winding and the casing, and the connecting cylinder encapsulates the winding from the inside, and the inner wall of the sealed cavity includes The inner wall of the stator core and the inner wall of the connecting cylinder.

Preferably, the connecting cylinder includes two identical half-cylinder structures, each half-cylinder structure includes the same number of arc-shaped connecting plates as the stator iron cores, and each of the connecting plates includes a press-fitting segment and a connecting segment; The press-fitting segment is press-fitted on the inner side of the winding, and each adjacent two press-fitting segments form a groove for accommodating the stator core; a plurality of the connecting segments are connected end to end to form a ring structure, and the The annular structure is connected with the casing, and the press-fitting sections of the two half-tube structures are butted to form the connecting tube.

Preferably, in the cross section of the switched reluctance motor, the inner surface of the press-fit section and the inner surface of the stator iron core are on the same arc with the center of the rotating shaft of the switched reluctance motor as the center of the circle .

Preferably, the annular structure is formed by end-to-end butting of the connecting sections of every two adjacent connecting plates, and each of the connecting plates is connected to the housing.

Preferably, the connecting segments of every two adjacent connecting plates overlap end to end to form the annular structure, and every two connecting plates are connected to the casing at the overlapping portion.

Preferably, two ends of the alternately arranged connecting segments of the annular structure are provided with bent portions, and the bent portions overlap with the adjacent connecting segments.

Preferably, the connecting plate is provided with a first positioning hole, the casing includes an end cover and a fixing cylinder provided on one side of the end cover, and the fixing cylinder is provided with a corresponding first positioning hole. In the second positioning hole, the fixing cylinder and the annular structure are connected by threaded fasteners inserted in the first positioning hole and the second positioning hole.

Description of drawings

Figure 1 is a schematic diagram of the structure of a switched reluctance motor;

2 is a schematic diagram of a stator sealing structure of a specific embodiment of the switched reluctance motor provided by the present invention;

Fig. 3, Fig. 4 are respectively the front sectional view and the side sectional view of the sealing cylinder in Fig. 2;

5 is a schematic diagram of a stator sealing structure of another specific embodiment of the switched reluctance motor provided by the present invention;

FIG. 6 is a cross-sectional view of the stator sealing structure shown in FIG. 5;

FIG. 7 is a perspective view of a specific embodiment of the half-tube structure of the connecting tube in FIG. 6;

Fig. 8 is the structural representation of the connecting plate in Fig. 7;

FIG. 9 is a perspective view of another specific embodiment of the half-tube structure of the connecting tube in FIG. 6;

10 and 11 are a front view and a side view of the casing of the switched reluctance motor provided by the present invention.

Wherein, the corresponding relationship between the reference numerals and component names in Fig. 1 is:

Stator core 1'; winding 2'; housing 3'; rotor 7'; shaft 8';

The corresponding relationship between the reference numerals and component names in Figures 2 to 11 is:

stator core 1;

winding 2;

shell 3; end cover 31; fixing cylinder 32; second positioning hole 321;

connecting cylinder 4; half-cylinder structure 4a; connecting plate 41; pressing section 411; connecting section 412; first positioning hole 4121; bending part 4122; groove 42;

Sealed cavity 5; Evaporated coolant 6; Rotor 7; Rotating shaft 8; Condenser 9.

Detailed ways

The core of the present invention is to provide a switched reluctance motor. The stator structure of the motor is an integrally sealed structure, the stator core and the winding are enclosed in a sealed cavity, and the evaporative cooling liquid is encapsulated in the sealed cavity. The vibration produces friction damping, which can reduce vibration and noise, and enhance the working stability of the switched reluctance motor.

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

It should be noted that the azimuth word "axial" in this article refers to the direction in which the axis of the main shaft on which the rotor is installed extends, that is, the direction extending from left to right in Figure 5; The direction in which the axis radially spreads outward, that is, the direction in which the axis spreads outward from the center of the circle in FIG. It should be understood that these orientations are established on the basis of the accompanying drawings of the description, and their appearance should not affect the protection scope of the present invention.

Please refer to FIG. 2 , which is a schematic diagram of a stator sealing structure of a specific embodiment of the switched reluctance motor provided by the present invention.

In a specific embodiment, as shown in FIG. 2 , the present invention provides a switched reluctance motor, which includes a stator structure, a rotating shaft 8 , and a rotor 7 connected to the rotating shaft 8 . The stator structure is a sealed structure as a whole, including a stator iron core 1, a winding 2 surrounding the outer circumference of the stator iron core 1, a casing 3 covering the outside of the stator iron core 1, and a connecting cylinder 4 connected with the casing 3 to form a sealed cavity, The stator iron core 1 and the winding 2 are enclosed in a sealed cavity, and the sealed cavity is encapsulated with an evaporative cooling liquid 6 that generates a damping force for the vibration of the stator iron core 1 and the winding 2 .

Since the above-mentioned switched reluctance motor generates pulsating electromagnetic force waves, when the teeth of the stator core 1 are opposite to the slots of the rotor 7, the radial magnetic attraction force is the smallest. When opposite, this radial magnetic attraction is the largest. The stator is a shell structure, and it is inevitable that regular compression and expansion vibration will occur due to the radial pulsating magnetic attraction. This vibration emits noise through the shell. Therefore, the stator structure is the main source of the noise of the switched reluctance motor.

After the above structure is adopted, since the evaporative cooling liquid is a low-boiling, high-insulation, non-combustible evaporative cooling liquid 6, when the motor is running, the winding 2, the stator core 1, and other structural components generate a lot of heat due to various losses, so that the The temperature of the evaporative cooling liquid 6 filled around it increases until it reaches the saturation temperature of the liquid medium corresponding to the pressure in the cavity, starts to boil, and then absorbs heat and vaporizes, in a two-phase state of gas and liquid, so that the heating components can be fully Cooling, and because the temperature of the boiling working medium during the boiling heat exchange is basically distributed near the saturation temperature point, the temperature distribution of each stator part soaked in the medium is relatively uniform, especially the stator end has no local hot spot. The vapor cooling liquid in the two-phase state of gas and liquid has a density lower than that of the liquid medium, generates buoyancy and rises up to meet the condenser 9 at the top, transfers heat to the condensed water in it, condenses into liquid and drops back to the original place , which realizes self-circulation and noise-free evaporative cooling at room temperature.

The most important thing is that since the stator core is the main component that emits vibration and noise, and the stator core is immersed in insulating liquid, the distribution of electromagnetic force is obtained through magnetic field analysis, and then the vibration calculation in the entire structure of the stator is carried out. This brief analysis by electromechanical analogy, we can get

The vibration speed of the stator core and the motor casing is:

The amplitude of the vibration displacement is:

where: P _n is the equivalent concentrated force, r _m1 and r _m2 are the viscous damping coefficients of the iron core and the casing respectively, ω is the vibration angular frequency, K ₁ and K ₂ are the stiffness of the iron core and the casing, respectively, m ₁ , m ₂ are the mass of the iron core and the casing, respectively.

After the evaporative cooling medium soaks the entire stator, the viscous damping coefficients r _m1 and r _m2 in equations (1) and (2) are greatly increased, which is equivalent to significantly reducing the vibration speed and vibration amplitude. Practice has proved that when the rated operating capacity of the motor is At 2500KW, the noise is less than 100db, which is more than 20% lower than that of asynchronous motors with the same type of conventional structure. Not only that, after the motor adopts the immersion evaporative cooling stator method, because the cooling effect is the best, the motor volume is reduced by one third compared with the conventional structure of the same type, and the output power is also significantly improved, thus achieving the invention goal of low vibration and noise.

It can be seen that after adopting the above-mentioned stator sealing structure, the evaporative coolant can form a great frictional resistance to any movement trend of the stator on the basis of cooling, which also damps the vibration of the stator, and also prevents the transmission of sound. Vibration reduction and noise reduction effect is obvious.

In the first specific solution, as shown in Figures 3 and 4, Figures 3 and 4 are respectively the front cross-sectional view and the side cross-sectional view of the sealing cylinder in Figure 2. The above-mentioned connecting cylinder 4 may be cylindrical, so The connecting cylinder 4 is integrally disposed between the rotor 7 and the stator core 1 , and two axial ends of the connecting cylinder 4 are connected to the casing 3 .

In this way, when installing, it is only necessary to insert the cylindrical connecting cylinder 4 directly into the gap between the stator core 1 and the rotor 7 from one side, and then connect the two ends of the connecting cylinder 4 to the casing 3. The cylinder 4 and the casing 3 can form a sealed cavity, so that the stator structure has the characteristics of simple structure and convenient manufacturing. The premise of this structure is that the gap between the stator core 1 and the rotor 7 is large enough to accommodate the cylindrical connecting cylinder.

Please refer to FIG. 5 and FIG. 6 , FIG. 5 is a schematic diagram of the stator sealing structure of the switched reluctance motor provided by the present invention; FIG. 6 is a cross-sectional view of the stator sealing structure shown in FIG. 5 .

In the second specific solution, as shown in FIG. 5 and FIG. 6 , the above-mentioned connecting cylinder 4 axially connects the stator core 1 and the casing 3, the winding 2 and the casing 3, and the The connecting cylinder 4 encloses the winding 2 from the inside, and the inner wall of the sealed cavity 5 includes the inner wall of the stator core 1 and the inner wall of the connecting cylinder 4 .

With this structure, the connecting cylinder 4 connects the axial space between the stator core 1 and the casing 3 and the axial space between the winding 2 and the casing 3 , and the inner wall of the sealed cavity 5 includes the inner wall of the stator core 1 and the inner wall of the connecting cylinder 4 , therefore, the inner wall of the stator core 1 is not enclosed, so that the inner wall of the stator core 1 serves as a part of the inner wall of the sealed cavity 5 . Compared with the first specific solution, the gap between the inner wall of the stator core 1 and the outer surface of the rotor 7 is not occupied, and a small gap can still be maintained between the inner surface of the stator core 1 and the outer surface of the rotor 7 (usually no more than 0.4mm). It can be seen from this that the stator sealing structure can not only achieve the effects of vibration reduction and noise reduction, but also avoid the increase of magnetic flux leakage and ensure the working stability of the switched reluctance motor.

Please refer to FIGS. 7 and 8 . FIG. 7 is a perspective view of a specific embodiment of the connecting cylinder 4 in FIG. 6 ; FIG. 8 is a schematic structural diagram of the connecting plate 41 in FIG. 7 .

In a more specific solution, as shown in FIGS. 7 and 8 , the above-mentioned connecting cylinder 4 includes two identical half-cylinder structures 4a, and each half-cylinder structure 4a includes the same number of arc-shaped connecting plates 41 as the stator core 1 , Each connecting plate 41 includes a press-fitting segment 411 and a connecting segment 412; the press-fitting segment 411 is press-fitted on the inner side of the winding 2, and each adjacent two press-fitting segments 411 form a groove 42 for accommodating the stator core 1; a plurality of The connecting sections 412 are connected end to end to form an annular structure, the annular structure is connected to the housing 3 , and the press-fitting sections 411 of the two half-tube structures 4 a are butted to form the connecting tube 4 .

With this structure, during the installation process, the two half-cylindrical structures 4a are respectively inserted from both ends of the stator core 1 to the middle in the axial direction, so that the press-fitting section 411 of each arc-shaped connecting plate 41 is press-fitted on the On the inner side of the winding 2, the two half-cylinder structures 4a are butted to form the connecting cylinder 4, and then the connecting section 412 of the connecting plate 41 is connected with the casing 3, and finally the encapsulation of the stator sealing structure is completed.

In this way, the pressing section 411 of the arc-shaped connecting plate 41 plays the role of sealing the winding 2, and the groove 42 formed between each adjacent two pressing sections 411 is used to accommodate the stator iron core 1, and the arc-shaped connecting plate The connecting cylinder 4 formed by connecting the connecting sections 412 of 41 is set in the axial space between the end of the stator core 1 and the casing 3, the winding 2 and the casing 3, and plays the role of axial connection. The connecting cylinder 4 with this structure can simply and conveniently realize the axial connection between the stator core 1 and the casing 3 and the axial connection between the winding 2 and the casing 3 .

It should be noted that the above-mentioned connecting cylinder 4 is not limited to two semi-cylindrical structures, but can also be set as an integral structure, and the connecting cylinder 4 can be inserted from one side of the stator core 1 during installation.

In a further solution, as shown in FIG. 6 , in the cross section of the switched reluctance motor, the inner surface of the press-fit section 411 and the inner surface of the stator core 1 are in the same circle with the center of the rotating shaft 8 of the switched reluctance motor as the center of the circle. on the arc.

Since the press-fitting section 411 of the connecting plate 41 and the inner surface of the stator core 1 together form the inner surface of the sealing cavity 5, the above structure makes the distance from the inner wall of the entire sealing cavity 5 to the center of the rotating shaft 8 the same, which is convenient for subsequent packaging work. It also makes the structure of the switched reluctance motor symmetrical, and further reduces vibration and noise. Compared with the sealed stator structure in which the press-fit section 411 is set on the outside of the inner surface of the stator core 1, this structure can maximize the volume in the sealed cavity 5, so as to accommodate more evaporative coolant 6 and further reduce the switched reluctance. Motor vibration and noise.

The specific connection mode of the connection cylinder 4 can also be further set.

In a specific embodiment, the connecting segments 412 of each of the two adjacent connecting plates 41 are butted end to end to form an annular structure, and each connecting plate 41 is connected to the housing 3 .

By adopting this structure, the structure of the connecting cylinder 4 is simple and symmetrical, and the installation and disassembly operations of each connecting plate 41 are convenient.

It is conceivable that the above-mentioned connecting cylinder 4 is not limited to the above-mentioned structure.

In another specific embodiment, as shown in FIG. 9 , which is a perspective view of another specific embodiment of the connecting cylinder 4 in FIG. 6 , the connecting sections 412 of every two adjacent connecting plates 41 overlap end to end to form a ring shape structure, and every two connecting plates 41 are connected to the casing 3 at the overlapping portion. With this structure, the casing 3 is connected to the plurality of connecting plates 41 at the same time, and every two adjacent connecting plates 41 are also connected, which can enhance the reliability of the connection between the connecting cylinder 4 and the casing 3 .

In a specific solution, as shown in FIG. 9 , the two ends of the connecting sections 412 (for example, the first, the third, and the fifth of the six connecting plates 41 ) that are arranged alternately are provided with outwardly bent portions 4122 , and the rest are arranged alternately. The connecting plates 41 (for example, the second, fourth, and sixth of the six connecting plates 41) are normally arranged, and the bent portions 4122 are arranged to overlap with the adjacent connecting segments 412.

It is conceivable that the overlapping arrangement of two adjacent connecting plates 41 is not limited to this one. For example, one end of the connecting segment 412 of each arc-shaped connecting plate 41 may be provided with the above-mentioned bending portion 4122, and the other end may be set normally. In every two adjacent connecting plates 41 , one end of one connecting plate 41 with the bent portion 4122 overlaps with the other end of the other connecting plate 41 without the bent portion to form an end-to-end overlap.

The specific connection manner of the above-mentioned connecting cylinder 4 and the housing 3 can also be further provided.

In another specific embodiment, as shown in FIG. 10 and FIG. 11 , FIG. 10 and FIG. 11 are the front view and side view of the casing of the switched reluctance motor provided by the present invention, and the connection plate 41 may be provided with The first positioning hole 4121, the housing 3 includes an end cover 31 and a fixing cylinder 32 arranged on one side of the end cover 31, the fixing cylinder 32 is provided with a second positioning hole 321 corresponding to the first positioning hole 4121, the fixing cylinder 32 and the ring The structures are connected by threaded fasteners inserted into the first positioning hole 4121 and the second positioning hole 321 .

With this structure, the connection between the annular structure and the connection cylinder 4 of the housing 3 can be realized simply and conveniently, and the connection reliability of the two is relatively strong. It is conceivable that the casing 3 and the annular structure are not only connected by threaded fasteners, but can also be connected in other ways, for example, a ring groove matching the annular structure can be provided in the fixing cylinder 32 of the casing 3 . When one side of each connecting plate 41 of the annular structure is press-fitted to the inner side of the winding 2 and the other side forms the annular structure, the annular structure can be interference fit into the annular groove, and the stable connection between the two can also be achieved.

The switched reluctance motor provided by the present invention has been described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (7)

1. A switched reluctance motor, comprising a stator structure, a rotating shaft (8), and a rotor (7) connected with the rotating shaft (8), wherein the stator structure is an integral sealing structure, and the stator structure is After the encapsulation is completed, the evaporative cooling liquid (6) is encapsulated in the sealed cavity (5) formed by the evaporative cooling liquid, and the evaporative cooling liquid (6) produces a frictional damping effect on the vibration of the stator structure to enhance the switched reluctance motor job stability; of which, The stator structure comprises a stator iron core (1), a winding (2) surrounding the outer periphery of the stator iron core (1), a casing (3) covering the outside of the stator iron core (1), and the connecting cylinder (4) to which the casing (3) is connected; The connecting cylinder (4) includes two identical half-cylinder structures (4a), and each of the half-cylinder structures (4a) includes the same number of arc-shaped connecting plates (41) as the stator iron core (1), Each of the connecting plates (41) includes a press-fitting section (411) and a connecting section (412), By inserting the two half-cylindrical structures (4a) from both ends of the stator core (1) to the middle in the axial direction, the press-fitting section (411) of each arc-shaped connecting plate (41) is pressed Installed on the inner side of the winding (2), the two half-cylinder structures (4a) are butted to form the connecting cylinder (4), and then the connecting section (412) of the connecting plate (41) is connected to the casing (4). 3) Connection to complete the encapsulation of the stator structure. 2 . The switched reluctance motor according to claim 1 , wherein the stator structure comprises a stator iron core ( 1 ), a winding ( 2 ) surrounding the outer circumference of the stator iron core ( 1 ), the casing (3) outside the stator core (1), and the connecting cylinder (4) connected with the casing (3), By directly inserting the connecting cylinder (4) into the gap between the stator core (1) and the rotor (7) from one side, and connecting the two axial directions of the connecting cylinder (4) The ends are connected to the housing (3) to form the sealed cavity (5). 3 . The switched reluctance motor according to claim 1 , wherein the stator structure comprises a stator iron core ( 1 ), a winding ( 2 ) surrounding the outer periphery of the stator iron core ( 1 ), Describe the casing (3) outside the stator core (1), and the connecting cylinder (4), The connecting cylinder (4) axially connects the stator core (1) and the casing (3), the winding (2) and the casing (3), and the connecting cylinder (4) The winding (2) is encapsulated from the inside, and the inner wall of the sealed cavity (5) includes the inner wall of the stator core (1) and the inner wall of the connecting cylinder (4). 4. The switched reluctance motor according to claim 2 or 3, wherein a gap of no more than 0.4 mm is maintained between the inner surface of the stator core (1) and the outer surface of the rotor (7) . 5. The switched reluctance motor according to claim 4, wherein the stator core (1) and the winding (2) are enclosed in the sealed cavity (5), and in the sealed cavity (5) The evaporative cooling liquid (6) encapsulated inside produces a damping effect on the vibration of the stator iron core (1) and the winding (2), so as to achieve vibration reduction and noise reduction of the stator structure. 6. The switched reluctance motor according to claim 5, wherein the switched reluctance motor soaks the stator structure in the evaporative cooling liquid (6). 7. The switched reluctance motor according to claim 2 or 3, wherein the evaporative cooling liquid (6) achieves vibration and noise reduction of the stator structure in the following manner: When the motor is running, the heat generated by the heating component increases the temperature of the evaporative cooling liquid (6) filled around it to the saturation temperature of the liquid medium corresponding to the pressure in the cavity and starts to boil, and then the evaporative cooling The liquid (6) absorbs heat and vaporizes, and is in a two-phase state of gas and liquid, so that the heating components can be cooled, while the density of the vapor cooling liquid (6) in the gas and liquid two-phase state is lower than that of the liquid medium, which generates buoyancy and rises upwards. To the condenser (9), the heat is transferred to the condensed water in it, condensed into a liquid, and then dripped back to the original place, thus realizing self-circulation and noise-free evaporative cooling at normal temperature, thereby realizing the stability of the stator structure. Vibration and noise reduction.