CN117543874A - End cover of permanent magnet synchronous motor and permanent magnet synchronous motor - Google Patents

Abstract

The invention provides an end cover of a permanent magnet synchronous motor and the permanent magnet synchronous motor, wherein the end cover of the permanent magnet synchronous motor can be connected with a shell of the permanent magnet synchronous motor in a matching way, one side of the periphery of the shell is provided with a controller, the end cover is provided with a windward side, at least part of the structure of the windward side, which is not towards the controller, is provided with a cover fin, the windward side is not provided with a cover fin, a notch structure is formed on the windward side, and the air flow on the windward side of the end cover can flow to the controller through the notch structure. According to the invention, low noise and low temperature rise can be simultaneously considered, and the heat dissipation efficiency of the motor and the variable frequency controller is greatly improved while the ventilation noise of the motor is reduced.

Description

End cover of permanent magnet synchronous motor and permanent magnet synchronous motor

Technical Field

The invention relates to the technical field of motors, in particular to an end cover of a permanent magnet synchronous motor and the permanent magnet synchronous motor.

Background

The traditional variable-frequency permanent magnet synchronous motor is required to be matched with a variable-frequency controller to drive the motor, and the variable-frequency controller remotely drives and controls the motor through a power line. The driving mode occupies a large space, and the overlong power line can also cause signal attenuation of the controller to influence the overall stability of the driving system.

The prior Chinese patent with publication number of CN203967911U discloses a novel structure integrating a motor and a driving controller. And a riding chassis is arranged above the motor, a variable frequency controller is arranged in the chassis, and the motor is connected with the variable frequency controller through a wiring board on the side wall of the chassis. The integrated structure of the variable frequency controller and the motor can reduce the whole volume of the driving system and greatly improve the space utilization rate; furthermore, the integrated structure can improve the overall stability of the driving system while reducing the installation cost.

The motor and variable frequency controller integrated structure can save installation space, but the heat dissipation efficiency of the motor and the controller is lower. The traditional motor and the variable frequency controller respectively dissipate heat through built-in fan blades of the traditional motor and the variable frequency controller; after integration, the two are mainly radiated by means of a fan or a fan inside the motor, and the radiating effect is poor. Although increasing the fan diameter of the electric fan blade or the fan power can enhance the heat dissipation effect, the motor noise is larger.

Because the driving integrated permanent magnet synchronous motor in the prior art has the technical problems of difficulty in simultaneously considering low noise, low temperature rise and the like, the invention designs the end cover of the permanent magnet synchronous motor and the permanent magnet synchronous motor.

Disclosure of Invention

Therefore, the invention aims to overcome the defect that the driving integrated permanent magnet synchronous motor in the prior art is difficult to simultaneously consider low noise and low temperature rise, and further provides an end cover of the permanent magnet synchronous motor and the permanent magnet synchronous motor.

In order to solve the above problems, the present invention provides an end cover of a permanent magnet synchronous motor, wherein:

the end cover can be matched and connected with a shell of the permanent magnet synchronous motor, a controller is arranged on one side of the periphery of the shell, the end cover is provided with a windward side, at least part of the structure of one side which does not face the controller is provided with cover fins, one side which faces the controller is not provided with the cover fins, a notch structure is formed on the windward side, and the air flow on the windward side of the end cover can flow to the controller through the notch structure.

In some embodiments of the present invention, in some embodiments,

the controller is located the top of end cover, the breach structure forms in the upper end of the windward side of end cover, the windward side is the cambered surface structure for the breach structure forms into the arc breach.

In some embodiments of the present invention, in some embodiments,

the cover-shaped fins comprise first cover-shaped fins located on one side of the central axis of the end cover in the horizontal direction, second cover-shaped fins located on the other side of the central axis in the horizontal direction, and third cover-shaped fins located below the central axis, and arc-shaped notches are formed above the central axis.

In some embodiments of the present invention, in some embodiments,

the top of the windward side is tangent to form a tangent plane, the included angle between the tangent plane and the horizontal plane is C8, the range of C8 is 63 degrees or more and is not more than 70 degrees or less than 8 degrees, and the tangent plane forms a plane for guiding air flow towards the direction of the controller.

In some embodiments of the present invention, in some embodiments,

the cover-type fin comprises an arc-shaped section fin, a first connecting section fin and a second connecting section fin, wherein one end of the first connecting section fin is connected with a first position on the windward side, the other end of the first connecting section fin extends towards the radial outer side direction of the end cover to be connected with one end of the arc-shaped section fin, one end of the second connecting section fin is connected with a second position on the windward side, the other end of the second connecting section fin extends towards the radial outer side direction of the end cover to be connected with the other end of the arc-shaped section fin, and a preset space is reserved between the arc-shaped section fin and the windward side so as to allow air flow to flow out of the preset space.

In some embodiments of the present invention, in some embodiments,

in the projection plane perpendicular to the central axis of the end cover, the arc section fins are of arc section structures, inner guide fins are further convexly arranged on the radial inner peripheral surface of the arc section fins, and outer guide fins are further convexly arranged on the radial outer peripheral surface of the arc section fins.

In some embodiments of the present invention, in some embodiments,

the center of the arc-shaped section fins points to the central axis, a plurality of inner guide fins are arranged on the radial inner peripheral surface of the arc-shaped section fins at intervals, a plurality of outer guide fins are arranged on the radial outer peripheral surface of the arc-shaped section fins at intervals.

In some embodiments of the present invention, in some embodiments,

the connecting chassis comprises an arc rib and a fixing part, wherein the inner wall and the outer wall of the arc rib are arc-shaped, the inner peripheral wall of the arc rib is connected with the outer peripheral wall of the cover-shaped fin, the outer peripheral wall of the arc rib protrudes out of the radial outer side of the cover-shaped fin, the fixing part is arranged between the two adjacent cover-shaped fins, the radial outer end of the fixing part is connected with the inner periphery of the arc rib, and the radial inner end of the fixing part is connected with the windward side of the end cover.

In some embodiments of the present invention, in some embodiments,

when the cap-type fin includes a first cap-type fin located at one side of a central axis of the end cap in a horizontal direction, a second cap-type fin located at the other side of the central axis in the horizontal direction, and a third cap-type fin located below the central axis:

In a projection plane perpendicular to the central axis of the end cover, the arc length of the first cover-shaped fin and the arc length of the second cover-shaped fin are C5, the arc length of the third cover-shaped fin is C6, the total arc length of the cover-shaped fin and the connecting chassis is C7, the arc length of the notch structure is C4, C7=2xC5+C6, and C4/C7 is more than or equal to 0.35 and less than or equal to 0.38,0.62 and C5/C6 is more than or equal to 0.64.

The invention also provides a permanent magnet synchronous motor which comprises the end cover and a fan housing,

the fan housing comprises an air inlet cylinder positioned in the fan housing, the radial distance between the inner periphery of the housing type fins and the central axis of the end cover is the upper inner radius C3 in the section plane perpendicular to the central axis of the end cover, the axial height of the housing type fins along the central axis direction is the fin height C1, the radial distance between the outer periphery of the arc-shaped ribs and the central axis is the fin bottom inner radius C2, the radius of the inner wall of the air inlet end of the air inlet cylinder is A8, and the proportion relation between the C3 and the A8 is 1.25-1/A3-A8-1.28.

In some embodiments of the present invention, in some embodiments,

the shortest axial distance between the axial end of the air inlet cylinder facing the end cover and the windward surface of the end cover is B1.2, the axial height of the end cover is C1.1 in the longitudinal section plane, the axial height of the cover-shaped fin protruding out of the end cover is C1.2, and the cover-shaped fin has C1=C1.1+C1.2,

0.44≤C1.2/B1.2≤0.46。

In some embodiments of the present invention, in some embodiments,

the fan cover is of a cylindrical structure and provided with a central axis, and comprises an air inlet end positioned at one axial end and an air outlet end positioned at the other axial end, wherein a first notch is arranged at one side of the air inlet end, which faces the controller, so that air flow in the air inlet end of the fan cover can flow to the controller through the first notch; and/or the air outlet end is provided with a second notch at one side facing the controller, so that the air flow in the fan housing can flow to the controller through the second notch.

In some embodiments of the present invention, in some embodiments,

the air inlet end of the fan housing is concavely provided with an air gathering channel in the direction towards the inside of the fan housing, the air gathering channel is of a contracted cylindrical structure, and the cross-sectional area of the inner wall of the air gathering channel, which is perpendicular to the central axis, is gradually reduced along the airflow flowing direction.

In some embodiments of the present invention, in some embodiments,

the air inlet end of the fan cover extends to the outlet end of the air gathering channel, and the plurality of first guide fins are arranged at intervals along the circumferential direction of the air gathering channel.

In some embodiments of the present invention, in some embodiments,

the tail end of the air gathering channel along the airflow flowing direction is connected with the air inlet barrel, and the air gathering channel is communicated with the air inlet barrel so that the airflow in the air gathering channel can enter the air inlet barrel; one end of the air inlet cylinder is connected with the downstream end of the air gathering channel, and the other end of the air inlet cylinder extends towards the direction of the air outlet end of the air cover.

In some embodiments of the present invention, in some embodiments,

the air inlet cylinder is of a flaring cylinder structure, the cross-sectional area of the inner wall of the air inlet cylinder which is perpendicular to the central axis is gradually increased along the airflow flowing direction, and the other end of the air inlet cylinder extends to a preset distance greater than 0 from the air outlet end towards the air outlet end of the air cover.

In some embodiments of the present invention, in some embodiments,

the fan housing still including being located draw in the wind channel with the outer layer structure of air inlet section of thick bamboo periphery, outer layer structure is tubular structure and includes first axle section structure, first axle section structure is located draw in the wind channel with the periphery of air inlet section of thick bamboo, the partial structure of first axle section structure with draw in the outer wall connection in wind channel, the partial structure of first axle section structure is located the periphery of air inlet section of thick bamboo and with the air inlet section of thick bamboo interval sets up.

In some embodiments of the present invention, in some embodiments,

the outer layer structure further comprises a second shaft section structure, the second shaft section structure is connected to one axial end of the first shaft section structure along the airflow direction, the second shaft section structure is located on the downstream side of the air inlet barrel along the airflow direction, and the second shaft section structure is located on the periphery of at least part of the end cover of the permanent magnet synchronous motor and is arranged at intervals with the end cover.

In some embodiments of the present invention, in some embodiments,

the inner wall of the second shaft section structure is provided with a second guide fin, the second guide fin is positioned on the periphery of the end cover fin of the end cover, the second guide fin is arranged at intervals between the second guide fin and the end cover fin, and the second guide fin and the end cover fin jointly act on air flow so as to guide the air flow towards the direction of the air outlet end.

In some embodiments of the present invention, in some embodiments,

the second guide fins extend along the axial direction of the fan housing, the second guide fins are multiple, and the second guide fins are arranged on the inner wall of the second shaft section structure at intervals along the circumferential direction.

In some embodiments of the present invention, in some embodiments,

the outer layer structure further comprises a third shaft section structure, the third shaft section structure is connected to the axial downstream end of the second shaft section structure along the airflow direction, and the third shaft section structure is located at the periphery of at least part of the structure of the casing of the permanent magnet synchronous motor and is arranged at intervals with the casing.

The end cover of the permanent magnet synchronous motor and the permanent magnet synchronous motor provided by the invention have the following beneficial effects:

1. according to the invention, the cover-shaped fins are not arranged on one side of the end cover facing the controller, so that a notch structure can be formed at the position, and therefore, the air flow flowing through the windward side of the end cover can be effectively guided to the controller, so that the controller can be effectively radiated, the radiating efficiency of the controller can be improved, the effective radiating of the controller can be ensured and improved on the basis of not increasing the rotating speed of a fan (not increasing noise) and not increasing the structural volume, the low noise and the low temperature rise can be simultaneously considered, and the radiating efficiency of the motor and the variable frequency controller can be greatly improved while the ventilation noise of the motor is reduced.

2. The section of the motor end cover is arc-like, the arc top is plane, and the arc surface is added with a cover type diversion radiating fin. The cover type fins are annularly distributed around the end cover and divided into three areas to guide air flow to the left, right and lower shell radiating channels respectively, and guide fins are arranged on the inner and outer surfaces of the cover type fins. The arc notch of the hood-type fin is used for guiding air flow to enter the heat dissipation flow channel formed by the fin above the shell and the bottom of the controller. The angle of the arc tangent plane of the cross section of the end cover can ensure that the airflow thrown out of the air inlet barrel by the fan blade can enter the heat dissipation flow channel along the surface of the end cover along the shortest path, so that the airflow loss is reduced.

3. The hood-type fins can enhance the heat exchange performance between the air flow and the end cover, and a preset space is formed between the arc-shaped section fins and the windward side, so that the air flow of the air flow passing through the hood-type fins is improved, and the heat exchange efficiency between the air flow and the end cover is increased; and the inner side of the arc-shaped section fin is provided with an inner side guide fin, and the outer side of the arc-shaped section fin is provided with an outer side guide fin, so that the heat exchange area between the arc-shaped section fin and the air flow can be further enhanced, and the heat exchange efficiency of the end cover is further enhanced.

4. According to the invention, the first notch is arranged at the air inlet end of the fan cover towards one side of the controller, so that the air flow in the fan cover can be effectively guided to the controller to radiate the heat of the controller, the second notch is arranged at the air outlet end of the fan cover towards one side of the controller, the air flow in the fan cover, which is close to the air outlet end, can be effectively guided to the controller to effectively radiate the heat of the controller, so that the heat radiation efficiency of the controller can be improved, the effective heat radiation of the controller can be ensured and improved on the basis of not increasing the rotating speed (not increasing the noise) of the fan and not increasing the structural volume, the low noise and the low temperature rise can be simultaneously considered, and the heat radiation efficiency of the motor and the variable frequency controller can be greatly improved while the ventilation noise of the motor is reduced.

5. The invention can also improve the effect of gathering and guiding the air flow through the air gathering channel, can play a role of further guiding the air and improving the structural strength through the second guide fins arranged on the inner wall of the air gathering channel, can restrict and rectify the air flow after gathering the air through the air inlet channel, so that the air flow orderly flows to the end cover, the fan blade and other positions, and the heat dissipation performance is improved; the invention also can guide the air flow after the air gathering channel and the air inlet cylinder guide the air to the fan blade to the end cover fin for heat dissipation, the shell outside fin for heat dissipation and the second notch for effective heat dissipation to the controller, further improving the heat dissipation performance of the motor.

Drawings

Fig. 1 is a perspective view of an end cover of a permanent magnet synchronous motor of the present invention;

fig. 2 is a front structural view of an end cover of the permanent magnet synchronous motor of fig. 1;

FIG. 3 is a right side cross-sectional view of FIG. 2;

FIG. 4 is a front cross-sectional view of the end cover and fan blade and fan housing of the permanent magnet synchronous motor of the present invention after assembly;

fig. 5 is a front cross-sectional view of the permanent magnet synchronous motor of the present invention;

FIG. 6 is a right side view of FIG. 5 (with the end cap fin portions highlighted);

FIG. 7 is a graph of the variation of the surface temperature of the tail end fins of the casing of the permanent magnet synchronous motor of the present invention versus (C3/A8);

FIG. 8 is a graph of the variation between the surface temperature of the end fins of the casing of the permanent magnet synchronous motor of the present invention and (C1.2/B1.2);

FIG. 9 is a graph of the variation between the surface temperature of the end fins of the casing of the permanent magnet synchronous motor of the present invention and (C4/C7);

fig. 10 is a graph showing the change between the surface temperature of the end fin of the case of the permanent magnet synchronous motor of the present invention and (C5/C6).

The reference numerals are expressed as:

1. a motor; 2. a controller; 3. a fixed support plate; 4. a heat radiation fin; 5. a front flange; 6. a housing; 7. a stator; 8. a rotor; 9. an end cap; 91. a windward side; 92. cutting a plane; 10. a fan blade; 11. a fan housing; 111. an air inlet end; 112. an air outlet end; 113. an outer layer structure; 114. a first shaft segment structure; 115. a second shaft section structure; 116. a third shaft section structure; 12. a screw; 13. a first cavity; 14. a second cavity; 15. a first notch; 16. air gathering channels; 17. an inlet end of the air inlet cylinder; 18. an air inlet cylinder; 19. a notch structure; 20. a second notch; 200. a hood-type fin; 21. a first cap-type fin; 22. a second cap-type fin; 23. a third cap-type fin; 24. a cavity; 25. a second guide fin; 26. a first guide fin; 27. arc section fins; 28. a first connection section fin; 29. a second connection section fin; 210. presetting a space; 211. an inner guide fin; 212. an outer guide fin; 213. the chassis is connected; 214. arc ribs; 215. a fixing part.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

As shown in fig. 1 to 10, the present invention provides an end cover of a permanent magnet synchronous motor, wherein:

the end cover 9 can be matched and connected with the casing 6 of the permanent magnet synchronous motor, a controller 2 is arranged on one side of the periphery of the casing 6, the end cover 9 is provided with a windward side 91, at least part of the windward side 91 on the side which does not face the controller 2 is structurally provided with a cover-type fin 200 (the cover-type fin is similar to a fin structure of which the cover covers the windward side of the end cover), the windward side 91 on the side which faces the controller 2 is not provided with the cover-type fin, a notch structure 19 is formed, and the air flow on the windward side 91 of the end cover 9 can flow to the controller 2 through the notch structure 19.

According to the invention, the cover-shaped fins are not arranged on one side of the end cover facing the controller, so that a notch structure can be formed at the position, and therefore, the air flow flowing through the windward side of the end cover can be effectively guided to the controller, so that the controller can be effectively radiated, the radiating efficiency of the controller can be improved, the effective radiating of the controller can be ensured and improved on the basis of not increasing the rotating speed of a fan (not increasing noise) and not increasing the structural volume, the low noise and the low temperature rise can be simultaneously considered, and the radiating efficiency of the motor and the variable frequency controller can be greatly improved while the ventilation noise of the motor is reduced.

The cooling and heat dissipation mode commonly used at present for the driving integrated permanent magnet synchronous motor in the prior art is to cool a motor self-heat dissipation fan blade or to add a fan at the tail of the motor for cooling. Because the heat dissipation effect of the motor and the controller is considered, the fan diameter of the fan blade is often increased or the fan power is increased to improve the air inlet quantity of the driving system so as to meet the heat dissipation requirement of the driving system. However, increasing the fan diameter of the fan or increasing the fan power can cause the noise of the driving integrated permanent magnet synchronous motor to be larger, so that the driving system cannot be applied to some low-noise low-temperature rise requirement working conditions. The invention aims at the pain points of the driving integrated permanent magnet synchronous motor, which are difficult to consider low noise and low temperature rise, and the rear end cover, the fan blade and the fan cover of the motor are combined in structural design; the heat dissipation efficiency of the motor and the variable frequency controller is greatly improved while the ventilation noise of the motor is reduced. According to the invention, the heat flow simulation and prototype trial production results show that the combined structure design of the fin rear end cover, the volute type fan cover and the low-noise fan blade can greatly improve the heat dissipation efficiency of the driving integrated permanent magnet synchronous motor; and the low-noise fan blade and the volute type fan cover can also maintain the ventilation noise of the driving integrated permanent magnet synchronous motor at a lower level.

In some embodiments of the present invention, in some embodiments,

the controller 2 is located above the end cover 9, the notch structure 19 is formed at the upper end of the windward side 91 of the end cover 9, and the windward side 91 is a cambered surface structure, so that the notch structure 19 is formed as an arc notch.

The invention is in a preferable structural form between the controller and the end cover, namely, the controller is arranged above the end cover, and at the moment, through the notch structure formed at the upper end of the windward side of the end cover, the invention can effectively guide the air flow reaching the windward side of the end cover to the controller upwards, thereby improving the heat exchange efficiency of the controller.

In some embodiments of the present invention, in some embodiments,

the cap-shaped fin 200 includes a first cap-shaped fin 21 located at one side of the central axis of the end cap 9 in the horizontal direction, a second cap-shaped fin 22 located at the other side of the central axis in the horizontal direction, and a third cap-shaped fin 23 located below the central axis, the arc-shaped notch being formed above the central axis.

The cover-type fins are preferably arranged in the mode shown in fig. 2 and 5, namely, one side in the horizontal direction is provided with the first cover-type fins, so that air flow can be guided towards the side, heat exchange with the end cover fins and then guided to other parts (preferably motor shells) requiring heat exchange are performed, the other side in the horizontal direction is provided with the first cover-type fins, air flow can be guided towards the side, heat exchange with the end cover fins and then guided to other parts (preferably motor shells) requiring heat exchange are performed, the lower side in the vertical direction is provided with the third cover-type fins, air flow can be guided towards the side, heat exchange with the end cover fins and then guided to other parts (preferably motor shells) requiring heat exchange are performed, and therefore heat dissipation efficiency of a motor is improved by further dissipating heat from the left side, the lower side and the right side of the shell while heat dissipation of the end cover is improved.

In some embodiments of the present invention, in some embodiments,

the top end of the windward side 91 is formed into a tangential plane 92 by tangential processing, the included angle between the tangential plane 92 and the horizontal plane is C8, the range of C8 is 63 degrees or more and is not more than 70 degrees or less, and the tangential plane 92 is formed into a plane for guiding the air flow towards the direction of the controller 2.

The invention is a preferable structural form of the windward side at the notch structure, namely, the structure of arranging the tangential plane at the top end of the windward side can effectively guide the direction of the air flow towards the controller, so that the amount of the air entering the heat exchanger for heat exchange is further improved, and the heat exchange efficiency of the heat exchanger is further improved.

The included angle C8 between the arc tangent plane of the surface of the end cover and the axis of the shaft hole of the fan cover is 63 degrees or more and is not more than 70 degrees, and the larger or smaller C8 can prolong the path of airflow in the air inlet cylinder into each heat dissipation and heat conduction containing cavity, so that the heat dissipation efficiency is affected.

In some embodiments of the present invention, in some embodiments,

the cover-type fin 200 comprises an arc-shaped section fin 27, a first connecting section fin 28 and a second connecting section fin 29, wherein one end of the first connecting section fin 28 is connected with a first position on the windward side 91, the other end of the first connecting section fin 28 extends towards the radial outer direction of the end cover 9 to be connected with one end of the arc-shaped section fin 27, one end of the second connecting section fin 29 is connected with a second position on the windward side 91, the other end of the second connecting section fin 29 extends towards the radial outer direction of the end cover 9 to be connected with the other end of the arc-shaped section fin 27, and the arc-shaped section fin 27 is separated from the windward side 91 by a preset space 210 so as to allow air flow to flow out of the preset space 210.

This is a further preferred structural form of the cap-type fin of the present invention, as shown in fig. 1, that is, includes an arc-shaped section fin located away from the windward side (away from the windward side through a preset space), and first and second connection section fins connected to both ends of the arc-shaped section fin, respectively, by which the arc-shaped section fin can be connected to a designated position of the windward side of the end cap, and an interval space is formed with the windward side, through which air flow can be allowed to flow, the air flow rate of the air flow flowing through the cap-type fin is improved, and the heat exchange efficiency between the air flow and the end cap is increased.

In some embodiments of the present invention, in some embodiments,

in a projection plane perpendicular to the central axis of the end cover 9, the arc-shaped section fins 27 have an arc-shaped section structure, inner guide fins 211 are also convexly arranged on the radial inner circumferential surface of the arc-shaped section fins 27, and outer guide fins 212 are also convexly arranged on the radial outer circumferential surface of the arc-shaped section fins 27.

The invention further can further enhance the heat exchange area with the air flow and further enhance the heat exchange efficiency of the end cover through the inner guide fins arranged on the inner circumference and the outer guide fins arranged on the outer circumference of the arc-shaped section fins.

In some embodiments of the present invention, in some embodiments,

the center of the arc-shaped section fins 27 points to the central axis, the number of the inner guide fins 211 is multiple, the inner guide fins 211 are distributed on the radial inner peripheral surface of the arc-shaped section fins 27 at intervals, the number of the outer guide fins 212 is multiple, and the outer guide fins 212 are distributed on the radial outer peripheral surface of the arc-shaped section fins 27 at intervals.

The heat exchange area between the inner guide fins and the outer guide fins and the airflow can be further increased, and the heat exchange efficiency of the end cover can be further improved through the arrangement of the inner guide fins and the outer guide fins.

In some embodiments of the present invention, in some embodiments,

the connection chassis 213 comprises arc ribs 214 and fixing portions 215, wherein inner and outer Zhou Jun of the arc ribs 214 are arc-shaped, the inner peripheral wall of the arc ribs 214 is connected with the outer peripheral wall of the cover-shaped fins 200, the outer peripheral wall of the arc ribs 214 protrudes out of the radial outer sides of the cover-shaped fins 200, the fixing portions 215 are arranged between the two adjacent cover-shaped fins 200, the radial outer ends of the fixing portions 215 are connected with the inner periphery of the arc ribs 214, and the radial inner ends of the fixing portions 215 are connected with the windward side 91 of the end cover 9.

The invention can be further connected with the radial periphery or the shaft ends of the plurality of cover-type fins through the connecting chassis, so that the plurality of cover-type fins are connected into a whole, the structural strength of the cover-type fins is improved, the arc-shaped ribs are preferably connected with the windward side of the end cover through the arc-shaped ribs, the structure integrated with the windward side of the end cover is formed through the fixing part, and the fixing part is preferably provided with the mounting hole, so that the structural strength of the cover-type fins can be improved while the cover-type fins are integrally connected with the windward side (the end cover main body) of the end cover, and the heat exchange performance of the end cover is improved.

In some embodiments of the present invention, in some embodiments,

when the cap-type fin 200 includes a first cap-type fin 21 located at one side in the horizontal direction of the central axis of the end cap 9, a second cap-type fin 22 located at the other side in the horizontal direction of the central axis, and a third cap-type fin 23 located below the central axis:

in a projection plane perpendicular to the central axis of the end cover 9, the arc lengths of the first cover-shaped fin 21 and the second cover-shaped fin 22 are C5, the arc length of the third cover-shaped fin 23 is C6, the total arc length of the cover-shaped fin 200 and the connecting chassis 213 is C7, the arc length of the notch structure 19 is C4, and the arc length is c7=2xc5+c6, and 0.35 is equal to or less than c4/c7 is equal to or less than 0.38,0.62, and the arc length of the notch structure 19 is equal to or less than c5/c6 is equal to or less than 0.64.

The upper part of the rear end cover is not provided with a hood-shaped fin, an arc gap is reserved, the arc length of the fin corresponding to the arc gap is C4, the arc length of the fin at the left side and the right side of the end cover is C5, the arc length of the fin below the end cover is C6, the total arc length of the fin is C7, and C7=2C5+C6. The flow of the air flow in the fan housing entering different heat dissipation positions can be controlled by adjusting the proportional relation among C4, C5 and C6, the C4 arc length working interval is a first cavity heat dissipation area, the C5 arc length working interval is a motor left end fin heat dissipation area and a motor right end fin heat dissipation area, and the C6 arc length working interval is a motor lower fin heat dissipation area. The arc length proportional relationship among the end cover fins in the invention is preferably as follows: C4/C7 is more than or equal to 0.35 and less than or equal to 0.38,0.62, C5/C6 is more than or equal to 0.64, so that optimal heat dissipation capacity distribution can be ensured, and heat dissipation efficiency of the end cover is improved. The inner surface of the end cover arc-shaped fin is provided with guide fins, and the guide fins on the inner surface are used for guiding airflow to enter a preset heat dissipation area; the outer surface guide fins serve to reduce turbulence.

The invention also provides a permanent magnet synchronous motor, comprising: the end cap 9, as previously described, further comprises a hood 11,

the fan housing 11 comprises an air inlet barrel 18 positioned in the fan housing, in a section plane perpendicular to the central axis of the end cover 9, the radial distance between the inner periphery of the hood-shaped fin 200 and the central axis of the end cover 9 is the upper inner radius C3, the axial height of the hood-shaped fin 200 along the central axis direction is the fin height C1, the radial distance between the outer periphery of the arc-shaped ribs 214 and the central axis is the inner radius C2 of the bottom of the fin, the radius of the inner wall of the air inlet end of the air inlet barrel 18 is A8, and the proportional relation between C3 and A8 is 1.25-C3/A8-1.28.

Most of the air flow sucked from the air duct enters the heat dissipation flow channel in the corresponding second containing cavity according to the guidance of the end cover type guide fins. The cap fins have 3 key structural factors, an upper inner radius C3, a fin height C1, and a fin bottom inner radius C2. The ratio relation between C3 and the radius A8 of the bottom of the air inlet cylinder is 1.25-1.28. The smaller C3 can cause that the air flow in the air inlet cylinder can not cool the shell according to a preset air channel, and the cooling efficiency is reduced; the larger C3 can cause air flow loss, so the air flow loss can be reduced while the casing is cooled according to the preset air duct through the size relation.

In some embodiments of the present invention, in some embodiments,

the shortest axial distance between the axial end of the air inlet tube 18 facing the end cover 9 and the windward side of the end cover 9 is B1.2, the axial height of the end cover 9 is C1.1 in the longitudinal section plane, the axial height of the hood-shaped fins 200 protruding from the end cover 9 is C1.2, and the hood-shaped fins have c1=c1.1+c1.2, and 0.44 is less than or equal to C1.2/B1.2 is less than or equal to 0.46.

The fin height C1 of the invention is composed of an end cover height C1.1 and a fin height C1.2 above the end cover. C1 The ratio between the C1.1+C1.2, C1.2 and the distance B1.2 of the bottom of the air inlet cylinder from the surface of the end cover is 0.44-C1.2/B1.2-0.46. The lower height of the fins can reduce the flow guiding effect, the higher height of the fins can reduce the air flow loss, but the unnecessary cost is increased, and the ventilation noise between the high-speed air flow thrown out by the air inlet cylinder and the fins can be increased, so that the air flow noise can be reduced while the flow guiding effect can be improved due to the arrangement of the size relation. C2 is required to be slightly larger than the outer diameters of the left, right, upper and lower fins of the shell, so that the heat dissipation efficiency of the air flow entering the fins of the shell is ensured.

In some embodiments of the present invention, in some embodiments,

the fan housing 11 is in a cylindrical structure and has a central axis, and comprises an air inlet end 111 positioned at one axial end and an air outlet end 112 positioned at the other axial end, wherein a first notch 15 is arranged at one side of the air inlet end 111 facing the controller 2, so that air flow in the air inlet end 111 of the fan housing can flow to the controller 2 through the first notch 15; and/or the air outlet end 112 is provided with a second notch 20 at a side facing the controller 2, so that the air flow inside the fan housing 11 can flow to the controller 2 through the second notch 20.

According to the invention, the first notch is arranged at the air inlet end of the fan cover towards one side of the controller, so that the air flow in the fan cover can be effectively guided to the controller to radiate the heat of the controller, the second notch is arranged at the air outlet end of the fan cover towards one side of the controller, the air flow in the fan cover, which is close to the air outlet end, can be effectively guided to the controller to effectively radiate the heat of the controller, so that the heat radiation efficiency of the controller can be improved, the effective heat radiation of the controller can be ensured and improved on the basis of not increasing the rotating speed (not increasing the noise) of the fan and not increasing the structural volume, the low noise and the low temperature rise can be simultaneously considered, and the heat radiation efficiency of the motor and the variable frequency controller can be greatly improved while the ventilation noise of the motor is reduced.

The cooling and heat dissipation mode commonly used at present for the driving integrated permanent magnet synchronous motor in the prior art is to cool a motor self-heat dissipation fan blade or to add a fan at the tail of the motor for cooling. Because the heat dissipation effect of the motor and the controller is considered, the fan diameter of the fan blade is often increased or the fan power is increased to improve the air inlet quantity of the driving system so as to meet the heat dissipation requirement of the driving system. However, increasing the fan diameter of the fan or increasing the fan power can cause the noise of the driving integrated permanent magnet synchronous motor to be larger, so that the driving system cannot be applied to some low-noise low-temperature rise requirement working conditions. The invention aims at the pain points of the driving integrated permanent magnet synchronous motor, which are difficult to consider low noise and low temperature rise, and the rear end cover, the fan blade and the fan cover of the motor are combined in structural design; the heat dissipation efficiency of the motor and the variable frequency controller is greatly improved while the ventilation noise of the motor is reduced. The heat flow simulation and prototype trial production results show that the combined structure design of the worm type fan housing, the fin rear end cover and the low-noise fan blade can greatly improve the heat dissipation efficiency of the driving integrated permanent magnet synchronous motor; and the low-noise fan blade and the volute type fan cover can also maintain the ventilation noise of the driving integrated permanent magnet synchronous motor at a lower level.

In some embodiments of the present invention, in some embodiments,

the air inlet end 111 of the fan housing 11 is concavely formed with an air gathering channel 16 in a direction towards the inside of the fan housing 11, the air gathering channel 16 is in a reduced cylindrical structure, and along the airflow flowing direction, the cross-sectional area of the inner wall of the air gathering channel 16 perpendicular to the central axis is gradually reduced.

The fan cover is in a preferable structural form, namely, the inlet end of the fan cover forms a furling air channel structure with a shrinkage opening through a recess, and the flow speed of air flow can be effectively improved through gradually reducing the cross sectional area of the inner wall of the furling air channel, so that the furling effect and the air suction effect of the air flow are enhanced, the air suction quantity is increased, and the heat dissipation performance of a motor and a controller is improved.

In some embodiments of the present invention, in some embodiments,

the air duct inner wall of the air gathering duct 16 is provided with a plurality of first guide fins 26, the first guide fins 26 are protruded out of the air duct inner wall of the air gathering duct 16, the first guide fins 26 extend from the air inlet end 111 of the air cover 11 to the outlet end of the air gathering duct 16, and the plurality of first guide fins 26 are arranged at intervals along the circumferential direction of the air gathering duct 16.

The invention also has the advantages that the plurality of first guide fins arranged on the inner wall of the air gathering channel can guide the flowing direction of air flow, is beneficial to guiding the air to the direction of the fan blade, avoids the conditions such as backflow air or vortex air, and the like, and can further enhance the effect of the structural strength of the air gathering channel, the plurality of first guide fins arranged at intervals in the circumferential direction can further increase the air guiding area, the structural strength is further improved, and the heat dissipation performance of the motor and the controller is improved.

In some embodiments of the present invention, in some embodiments,

the tail end of the air gathering channel 16 along the airflow flowing direction is connected with the air inlet cylinder 18, and the air gathering channel 16 is communicated with the air inlet cylinder 18 so that the airflow in the air gathering channel 16 can enter the air inlet cylinder 18; one end of the air inlet tube 18 is connected with the downstream end of the air gathering channel 16, and the other end of the air inlet tube 18 extends towards the air outlet end 112 of the fan housing 11.

The invention also discloses an air inlet cylinder structure communicated with the downstream side of the air flow direction of the air gathering channel, and the air flow can be restrained and rectified through the air inlet cylinder, so that the air flow orderly flows to the end cover, the fan blade and other positions, and the heat dissipation performance is improved.

In some embodiments of the present invention, in some embodiments,

the air inlet tube 18 is in a flared tube structure, the cross-sectional area of the inner wall of the air inlet tube 18 perpendicular to the central axis gradually increases along the air flow direction, and the other end of the air inlet tube 18 extends to a preset distance greater than 0 from the air outlet end 112 toward the air outlet end 112 of the fan housing 11.

The air inlet cylinder is preferably arranged in a cylindrical structure with flaring along the flowing direction, and can perform diffusion and pressurization on air flow, so that the flow speed is reduced, the pressure is improved, the effect and effect of rectifying the air flow are formed, conditions are provided for orderly flowing to the fan blades, disordered return air, vortex air and the like are reduced, air flow loss is reduced, energy consumption is reduced, the energy efficiency of a system is improved, and the heat dissipation performance of a motor and a controller is improved.

In some embodiments of the present invention, in some embodiments,

the fan housing 11 further comprises an outer layer structure 113 positioned at the periphery of the air gathering channel 16 and the air inlet barrel 18, the outer layer structure 113 is of a cylindrical structure and comprises a first shaft section structure 114, the first shaft section structure 114 is positioned at the periphery of the air gathering channel 16 and the air inlet barrel 18, a part of the first shaft section structure 114 is connected with the outer wall of the air gathering channel 16, and a part of the first shaft section structure 114 is positioned at the periphery of the air inlet barrel 18 and is arranged at intervals with the air inlet barrel 18.

The invention also can guide the air flow after the air gathering channel and the air inlet cylinder guide the air to the fan blade to the end cover fin for heat dissipation, the outer side fin of the shell for heat dissipation and the second notch for effective heat dissipation to the controller, further improving the heat dissipation performance to the motor and the controller; and can be connected with the outer wall in air channel that gathers together through first axle section structure for outer layer structure and air channel and air inlet section of thick bamboo connect structure as an organic whole, first axle section of thick bamboo structure is big than the external diameter of air inlet section of thick bamboo, is located the periphery of air inlet section of thick bamboo, makes the wind in the air inlet section of thick bamboo get into in the space that the volume is bigger after the pressurization is accelerated through the fan blade rotation, further improves pressure, improves the rectification performance to the air current, further improved with the heat exchange efficiency of end cover fin heat transfer, casing fin heat transfer and controller fin heat transfer.

In some embodiments of the present invention, in some embodiments,

the outer layer structure 113 further includes a second shaft section structure 115, where the second shaft section structure 115 is connected to one axial end of the first shaft section structure 114 along the airflow direction, and the second shaft section structure 115 is located on the downstream side of the air inlet tube 18 along the airflow direction, and the second shaft section structure 115 is located on the outer periphery of at least part of the structure of the end cover 9 of the permanent magnet synchronous motor and is spaced from the end cover 9.

The structure is a further preferable structure form of the outer layer structure, and the end cover part can be wrapped through the arrangement of the second shaft section structure, so that the air flow after being pressurized and accelerated by the fan blade is guided by the second shaft section structure to act on the end cover for contact, and heat exchange is carried out on the end cover (especially, the heat exchange is carried out on the end cover through the contact of the end cover fins).

In some embodiments of the present invention, in some embodiments,

the second shaft section structure 115 is provided with a second guide fin 25 on an inner wall thereof, the second guide fin 25 is located at an outer periphery of the end cover fin of the end cover 9, and the second guide fin 25 is disposed at intervals between the end cover fin and the end cover fin, and the second guide fin 25 and the end cover fin act on the air flow together so as to guide the air flow toward the air outlet end 112.

The invention also discloses a heat exchange device comprising a second guide fin, wherein the second guide fin is arranged on the inner wall of the second shaft section structure, is opposite to the end cover fin and is arranged at intervals, and can guide the air flow through the end cover fin and the second guide fin, so that the heat exchange area of the end cover is increased, and the heat exchange effect of the end cover is improved.

In some embodiments of the present invention, in some embodiments,

the second guide fins 25 extend along the axial direction of the fan housing 11, and a plurality of the second guide fins 25 are arranged on the inner wall of the second shaft section structure 115 at intervals along the circumferential direction. The second guide fins extend along the axial direction of the fan cover and are arranged at intervals along the circumferential direction, so that the heat exchange area between the second guide fins and the end cover can be further increased, and the heat exchange effect on the end cover part is improved.

In some embodiments of the present invention, in some embodiments,

the outer layer structure 113 further includes a third shaft section structure 116, where the third shaft section structure 116 is connected to an axially downstream end of the second shaft section structure 115 along the airflow direction, and the third shaft section structure 116 is located at an outer periphery of at least a part of the structure of the casing 6 of the permanent magnet synchronous motor and is disposed at a distance from the casing 6. Preferably, the third shaft section structure 116 has an inner diameter greater than the inner diameter of the second shaft section structure 115, and the second shaft section structure 115 has an inner diameter greater than the inner diameter of the first shaft section structure 114.

The third shaft section structure is arranged to wrap part of the peripheral structure of the shell, so that the air flow after being pressurized and accelerated by the fan blades can be effectively guided to the peripheral part of the shell by the third shaft section structure, an effective heat dissipation effect is achieved on the motor, and the heat exchange performance of the motor can be further improved on the basis that the fins on the periphery of the original shell only exchange heat with the air flow in the air.

For solving the pain point that drive integral type PMSM is harder to compromise actuating system low noise and low temperature rise simultaneously among the prior art, this technical scheme provides a fin end cover, low noise fan blade and snail type wind integrated configuration, great promotion actuating system's radiating efficiency when reducing motor noise.

1. The invention relates to a driving integrated permanent magnet synchronous motor which mainly comprises a motor 1 and a variable frequency controller (controller 2). The fixed support plates 3 are arranged on two sides of the variable frequency controller, the fixed support plates are integrated with the motor together by the support plates during installation, and the radiating fins 4 are fully distributed at the bottom of the variable frequency controller, so that the radiating efficiency of the controller can be improved. The motor mainly comprises a front flange 5, a shell 6, a stator 7, a rotor 8, a rear end cover (end cover 9), a fan blade 10 and a fan cover 11, wherein the main parts are sequentially installed by taking the central line of a rotor rotating shaft as an installation axis. After the installation of the main parts of the motor is completed, the power line of the motor is connected with a variable frequency controller, and the variable frequency controller is fixed in the mounting holes on two sides of the motor shell by means of screws 12 to complete the installation of the driving integrated permanent magnet synchronous motor.

2. The driving integrated permanent magnet synchronous motor is internally provided with two airflow containing cavities, the area of a first containing cavity 13 is a cavity area formed by the bottom of a variable frequency controller, supporting plates on two sides of the variable frequency controller, the top of a motor shell, a fan housing and gaps of an end cover, and a large number of radiating fins of the variable frequency controller and the shell are distributed in the containing cavities. The area of the second cavity 14 is a cavity area formed by wrapping the rear end cover in the fan housing, and end cover fins and fan blades are distributed in the cavity.

3. When the driving integrated permanent magnet synchronous motor works, an external power line transmits a current signal to the variable frequency controller, the controller transmits the current signal to the motor through the power line, the motor starts to rotate positively to drive the noise reduction fan blade to rotate, and the sucked air flow assists the motor and the controller to dissipate heat.

4. Before the air flow enters the fan cover, a small part of the air flow can directly enter a flow channel between the top of the fan cover and the bottom of the controller through a small gap (a first gap 15) above the rear end of the fan cover, and directly enters the first containing cavity 13. Most of the air flows are gathered in a U-shaped air gathering channel 16 formed by inwards sinking the tail end of the fan housing, and the air flows enter the air gathering channel and then enter an air inlet cylinder 18 in the fan housing through an air inlet at the bottom of the air gathering channel (the inlet end of the air inlet cylinder), and the cylinder wall of the air inlet cylinder inclines outwards to assist the fan blade in wind power transmission.

5. After the air flow enters the air inlet barrel, the air flow is rotationally sucked into the second containing cavity 14 by the fan blade. The rotary fan blade is divided into two parts in the fan housing, one part enters the air inlet barrel 18, and the other part is positioned in the second containing cavity 14. The fan blade of the air inlet cylinder is wrapped with air flow when rotating, and the air flow in the air inlet cylinder is sent into the second containing cavity; the fan blades in the second cavity are responsible for sending air flow into the flow passage area formed by the end cover guide fins.

6. The heat dissipation flow passage of the second cavity is mainly divided into four pieces, firstly, air flows enter the first cavity 13 through the cover type fin arc-shaped notch (notch structure 19) above the end cover and the large notch (second notch 20) above the fan cover to assist heat dissipation; the rest three air flows respectively enter the left and right shell cooling channels of the shell and the lower shell to assist in cooling under the guidance of the cover-shaped guide fins at the left and right of the end cover and the lower part of the end cover. The remaining small portion of the air flow enters the cavity 24 formed by the outer circle of the fins and the inner wall of the fan, and is guided by the second guide fin 25 on the surface of the inner wall of the U-shaped fan front end to enter the heat dissipation flow channel of the motor shell. The U-shaped part at the lower end of the wind device can be divided into two layers according to the radius, the radius A2 at the rear end is smaller and is used for wrapping the end cover fins, the front end A3 is larger and is used for wrapping the radiating fins at the left and right ends and the lower end of the shell, and the air flow loss is reduced.

7. The driving integrated permanent magnet synchronous motor mainly conducts heat dissipation by means of gas flowing through the first containing cavity and the second containing cavity, and air flow in the first containing cavity can take away heat through the surfaces of the controller and the motor heat dissipation fins. Most of the air flow in the second accommodating cavity except the air flow flowing into the first accommodating cavity enters the left and right of the shell and the fin heat dissipation flow channels below the shell, and heat is taken away by the air flow flowing through the fin surfaces.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (21)

1. An end cover of a permanent magnet synchronous motor, which is characterized in that:

the end cover (9) can be matched with a shell (6) of the permanent magnet synchronous motor, a controller (2) is arranged on one side of the periphery of the shell (6), the end cover (9) is provided with a windward side (91), at least part of the windward side (91) on one side which does not face the controller (2) is structurally provided with a cover fin (200), the windward side (91) on one side which faces the controller (2) is not provided with a cover fin, a notch structure (19) is formed, and the air flow on the windward side (91) of the end cover (9) can flow to the controller (2) through the notch structure (19).

2. The end cover of a permanent magnet synchronous motor according to claim 1, wherein:

the controller (2) is located above the end cover (9), the notch structure (19) is formed at the upper end of the windward side (91) of the end cover (9), and the windward side (91) is of a cambered surface structure, so that the notch structure (19) is formed into an arc notch.

3. The end cover of a permanent magnet synchronous motor according to claim 2, wherein:

the hood-type fins (200) comprise first hood-type fins (21) located on one side of the central axis of the end cover (9) in the horizontal direction, second hood-type fins (22) located on the other side of the central axis in the horizontal direction, and third hood-type fins (23) located below the central axis, wherein the arc-shaped notch is formed above the central axis.

4. The end cover of a permanent magnet synchronous motor according to claim 2, wherein:

the top end of the windward side (91) is tangent to form a tangent plane (92), an included angle between the tangent plane (92) and a horizontal plane is C8, the range of C8 is 63 degrees or more and is or less than 70 degrees or less, and the tangent plane (92) is formed into a plane for guiding air flow towards the direction of the controller (2).

5. The end cover of a permanent magnet synchronous motor according to any one of claims 1-4, wherein:

The cover-type fin (200) comprises an arc-shaped section fin (27), a first connecting section fin (28) and a second connecting section fin (29), one end of the first connecting section fin (28) is connected with a first position on the windward side (91), the other end of the first connecting section fin (28) extends towards the radial outer direction of the end cover (9) to be connected with one end of the arc-shaped section fin (27), one end of the second connecting section fin (29) is connected with a second position on the windward side (91), the other end of the second connecting section fin (29) extends towards the radial outer direction of the end cover (9) to be connected with the other end of the arc-shaped section fin (27), and the arc-shaped section fin (27) and the windward side (91) are separated by a preset space (210) so as to allow airflow to flow out of the preset space (210).

6. The end cap of a permanent magnet synchronous motor according to claim 5, wherein:

in the projection plane perpendicular to the central axis of the end cover (9), the arc-shaped section fins (27) are of arc-shaped section structures, inner guide fins (211) are further convexly arranged on the radial inner peripheral surface of the arc-shaped section fins (27), and outer guide fins (212) are further convexly arranged on the radial outer peripheral surface of the arc-shaped section fins (27).

7. The end cap of a permanent magnet synchronous motor according to claim 6, wherein:

the center of the arc-shaped section fins (27) points to the central axis, a plurality of inner guide fins (211) are arranged, the inner guide fins (211) are distributed on the radial inner peripheral surface of the arc-shaped section fins (27) at intervals, a plurality of outer guide fins (212) are arranged, and the outer guide fins (212) are distributed on the radial outer peripheral surface of the arc-shaped section fins (27) at intervals.

8. The end cover of a permanent magnet synchronous motor according to any one of claims 1-7, wherein:

the connecting chassis (213) is connected through the connecting chassis (213), the connecting chassis (213) comprises an arc rib (214) and a fixing part (215), the inner and outer Zhou Jun of the arc rib (214) are arc-shaped, the inner peripheral wall of the arc rib (214) is connected with the outer peripheral wall of the cover-shaped fin (200), the outer peripheral wall of the arc rib (214) protrudes out of the radial outer side of the cover-shaped fin (200), the fixing part (215) is arranged between the two adjacent cover-shaped fins (200), the radial outer end of the fixing part (215) is connected with the inner periphery of the arc rib (214), and the radial inner end of the fixing part (215) is connected with the windward surface (91) of the end cover (9).

9. The end cap of a permanent magnet synchronous motor according to claim 8, wherein:

when the cap-type fin (200) includes a first cap-type fin (21) located on one side in the horizontal direction of the central axis of the end cap (9), a second cap-type fin (22) located on the other side in the horizontal direction of the central axis, and a third cap-type fin (23) located below the central axis:

in a projection plane perpendicular to the central axis of the end cover (9), the arc length of the first cover-shaped fin (21) and the arc length of the second cover-shaped fin (22) are C5, the arc length of the third cover-shaped fin (23) is C6, the total arc length of the cover-shaped fin (200) and the connecting chassis (213) is C7, the arc length of the notch structure (19) is C4, C7=2xC5+C6, and C4/C7 is more than or equal to 0.35 and less than or equal to 0.38,0.62 and C5/C6 is more than or equal to 0.64.

10. A permanent magnet synchronous motor, characterized in that:

comprising the following steps: the end cap (9) of claim 8, further comprising a hood (11),

the fan housing (11) comprises an air inlet barrel (18) positioned in the air housing, in a section plane perpendicular to the central axis of the end cover (9), the radial distance between the inner periphery of the hood-type fin (200) and the central axis of the end cover (9) is an upper inner radius C3, the axial height of the hood-type fin (200) along the central axis direction is a fin height C1, the radial distance between the outer periphery of the arc-shaped rib (214) and the central axis is a fin bottom inner radius C2, and the radius of the inner wall of the air inlet end of the air inlet barrel (18) is A8, and the ratio relation between C3 and A8 is 1.25-1.28.

11. The permanent magnet synchronous motor according to claim 10, wherein:

the shortest axial distance between the axial end of the air inlet cylinder (18) facing the end cover (9) and the windward surface of the end cover (9) is B1.2, the axial height of the end cover (9) is C1.1 in a longitudinal section plane, the axial height of the cover-shaped fins (200) protruding out of the end cover (9) is C1.2, and the cover-shaped fins have C1=C1.1+C1.2, and 0.44 is less than or equal to C1.2/B1.2 is less than or equal to 0.46.

12. The permanent magnet synchronous motor according to claim 10, wherein:

the fan cover (11) is of a cylindrical structure and is provided with a central axis, and comprises an air inlet end (111) positioned at one axial end and an air outlet end (112) positioned at the other axial end, wherein a first notch (15) is formed in the air inlet end (111) at one side of the air inlet end facing the controller (2), so that air flow in the air inlet end (111) of the fan cover can flow to the controller (2) through the first notch (15); and/or the air outlet end (112) is provided with a second notch (20) at one side facing the controller (2), so that air flow in the fan housing (11) can flow to the controller (2) through the second notch (20).

13. A permanent magnet synchronous motor according to claim 12, characterized in that:

The air inlet end (111) of the fan housing (11) is concavely provided with an air gathering channel (16) in a direction towards the inside of the fan housing (11), the air gathering channel (16) is of a contracted cylindrical structure, and the cross-sectional area of the inner wall of the air gathering channel (16) perpendicular to the central axis is gradually reduced along the airflow flowing direction.

14. A permanent magnet synchronous motor according to claim 13, characterized in that:

the air duct inner wall of the air gathering duct (16) is provided with a plurality of first guide fins (26), the first guide fins (26) are protruded out of the air duct inner wall of the air gathering duct (16) and are arranged, the first guide fins (26) extend from the air inlet end (111) of the air cover (11) to the outlet end of the air gathering duct (16), and the plurality of first guide fins (26) are arranged at intervals along the circumferential direction of the air gathering duct (16).

15. A permanent magnet synchronous motor according to claim 14, characterized in that:

the tail end of the air gathering channel (16) along the airflow flowing direction is connected with the air inlet cylinder (18), and the air gathering channel (16) is communicated with the air inlet cylinder (18) so that the airflow in the air gathering channel (16) can enter the air inlet cylinder (18); one end of the air inlet cylinder (18) is connected with the downstream end of the air gathering channel (16), and the other end of the air inlet cylinder (18) extends towards the air outlet end (112) of the fan housing (11).

16. The permanent magnet synchronous motor according to claim 15, wherein:

the air inlet cylinder (18) is of a flaring cylinder structure, the cross-sectional area of the inner wall of the air inlet cylinder (18) perpendicular to the central axis is gradually increased along the airflow flowing direction, and the other end of the air inlet cylinder (18) extends to a preset distance from the air outlet end (112) to be greater than 0 towards the air outlet end (112) of the fan housing (11).

17. The permanent magnet synchronous motor according to claim 15, wherein:

the fan housing (11) still including being located draw in wind channel (16) with outer layer structure (113) of air inlet section of thick bamboo (18) periphery, outer layer structure (113) are tubular structure and include first axle section of thick bamboo structure (114), first axle section of thick bamboo structure (114) are located draw in wind channel (16) with the periphery of air inlet section of thick bamboo (18), partial structure of first axle section of thick bamboo structure (114) with draw in the outer wall connection of wind channel (16), partial structure of first axle section of thick bamboo structure (114) are located the periphery of air inlet section of thick bamboo (18) and with air inlet section of thick bamboo (18) interval sets up.

18. The permanent magnet synchronous motor according to claim 17, wherein:

the outer layer structure (113) further comprises a second shaft section structure (115), the second shaft section structure (115) is connected to one axial end of the first shaft section structure (114) along the airflow direction, the second shaft section structure (115) is located on the downstream side of the air inlet barrel (18) along the airflow direction, and the second shaft section structure (115) is located on the periphery of at least part of the structure of the end cover (9) of the permanent magnet synchronous motor and is arranged at intervals with the end cover (9).

19. A permanent magnet synchronous motor according to claim 18, characterized in that:

the inner wall of the second shaft section structure (115) is provided with a second guide fin (25), the second guide fin (25) is located at the periphery of the end cover fin of the end cover (9), the second guide fin (25) and the end cover fin are arranged at intervals, and the second guide fin (25) and the end cover fin act on air flow together so as to guide the air flow towards the direction of the air outlet end (112).

20. The permanent magnet synchronous motor according to claim 19, wherein:

the second guide fins (25) extend along the axial direction of the fan housing (11), and the second guide fins (25) are multiple, and the second guide fins (25) are arranged on the inner wall of the second shaft section structure (115) at intervals along the circumferential direction.

21. A permanent magnet synchronous motor according to claim 18, characterized in that:

the outer layer structure (113) further comprises a third shaft section structure (116), the third shaft section structure (116) is connected to the axial downstream end of the second shaft section structure (115) along the airflow direction, and the third shaft section structure (116) is located at the periphery of at least part of the structure of the casing (6) of the permanent magnet synchronous motor and is arranged at intervals with the casing (6).