A motor cooling structure

Abstract

The application discloses a motor cooling structure to solve the technical problem of poor cooling effect of the existing motor cooling structure. It comprises: a first cooling cavity, which is arranged between the outer shell and the stator shell of the motor and outside the end wall of the stator shell in the outer side area of the first end of the stator winding of the motor, for cooling the first end part; a second cooling cavity, which is arranged between the outer shell and the stator shell of the motor and outside the end wall of the stator shell in the outer side area of the second end of the stator winding of the motor, for cooling the second end part; and a third cooling cavity, which is arranged between the outer shell and the stator shell of the motor and in the outer side area of the side wall of the stator shell, for cooling the side wall part.

Description

Technical Field

[0001] This invention relates to a motor cooling structure. Background Technology

[0002] Motors generate a significant amount of heat during operation, affecting their continuous and stable operation. Therefore, many motors are equipped with cooling structures. Existing motor cooling structures either employ annular cooling channels within the motor housing sidewalls to cool the housing using coolant (primarily water), or internal air-cooling channels to directly cool the heat generated by stator winding copper losses, stator core iron losses, and stator eddy current losses using airflow. The annular cooling channels primarily cool the motor housing, offering limited cooling effectiveness; while the air-cooling channels compromise the motor's internal seal, reducing its explosion-proof rating. Summary of the Invention

[0003] The purpose of this invention is to provide a motor cooling structure to solve the technical problem of poor cooling effect of existing motor cooling structures.

[0004] A motor cooling structure according to the present invention includes: a first cooling cavity disposed between the outer casing and the stator casing of the motor and located outside the end wall of the stator casing in the outer region of the first end of the stator winding of the motor, for cooling the first end portion; a second cooling cavity disposed between the outer casing and the stator casing of the motor and located outside the end wall of the stator casing in the outer region of the second end of the stator winding of the motor, for cooling the second end portion; and a third cooling cavity disposed between the outer casing and the stator casing of the motor and located outside the side wall of the stator casing of the motor, for cooling the side wall portion; wherein the first cooling cavity and the second cooling cavity are connected through the third cooling cavity to form a cooling medium flow path, and the outer casing is respectively provided with a cooling medium inlet and a cooling medium outlet communicating with the cooling medium flow path. The cooling medium used in the cooling medium flow path can be a coolant or a cooling gas.

[0005] Furthermore, the stator housing includes a stator housing body, a first end cover disposed at a first end of the stator housing body, and a second end cover disposed at a second end of the stator housing body; the first end cover and the stator housing body are an integral structure or an assembled structure, the first end cover is used to enclose the first end of the stator winding inside the first end cover, and the first end of the motor rotor is mounted in the first end cover by a bearing; the second end cover and the stator housing body are an integral structure or an assembled structure, the second end cover is used to enclose the second end of the stator winding inside the second end cover, and the second end of the motor rotor is mounted in the second end cover by a bearing; the first cooling cavity is disposed outside the first end cover and contacts the end face of the first end cover, and the second cooling cavity is disposed outside the second end cover and contacts the end face of the second end cover.

[0006] Furthermore, the first cooling cavity has a first annular cavity coaxially arranged with the stator housing, the second cooling cavity has a second annular cavity coaxially arranged with the stator housing, and the third cooling cavity has a third annular cavity coaxially arranged with the stator housing. The first annular cavity and the second annular cavity are connected through the third annular cavity.

[0007] Furthermore, the cooling medium inlet and the cooling medium outlet are respectively disposed on the end wall of the first end of the outer casing and are respectively connected to the first cooling cavity; a positioning and diverting flange is provided between the outer casing and the stator housing to divide the cooling medium flow path into an input side flow path connected to the cooling medium inlet and an output side flow path connected to the cooling medium outlet; a portion of the first cooling cavity and a portion of the third cooling cavity are separated into input side flow paths by the positioning and diverting flange, and another portion of the first cooling cavity and another portion of the third cooling cavity are separated into output side flow paths by the positioning and diverting flange; the second cooling cavity does not have the positioning and diverting flange, thus serving as an intermediate channel connecting the input side flow path and the output side flow path.

[0008] Furthermore, the positioning and diversion flange simultaneously divides the first annular cavity and the third annular cavity into a first semi-annular cavity and a second semi-annular cavity. The first semi-annular cavity is connected to the cooling medium inlet, and the second semi-annular cavity is connected to the cooling medium outlet.

[0009] Furthermore, the first and / or second ends of the stator housing have a hollow convex annular structure, the first and / or second ends of the stator winding of the motor are located in the corresponding hollow convex annular structure, the outer end wall of the hollow convex annular structure constitutes the end wall of the stator housing, the first cooling cavity and / or the second cooling cavity cover the outside of the outer end wall of the corresponding hollow convex annular structure and are connected to the third cooling cavity through a first flow channel located in the housing of the corresponding hollow convex annular structure.

[0010] Furthermore, the outer shell is provided with a flange, which is fastened to the shell corresponding to the hollow convex annular structure by bolts.

[0011] Furthermore, the flange has a second flow channel for connecting the first flow channel with the second cooling cavity.

[0012] Furthermore, the drive circuit of the motor is installed between the flange and the corresponding hollow convex ring structure and / or in the hollow convex ring structure, and the flange body is provided with a drive circuit installation and maintenance operation hole.

[0013] The motor cooling structure of this invention can cool the side walls and end walls of the motor stator housing. Since the first and second cooling chambers are located close to the two ends of the stator windings, they can effectively remove heat from inside the stator housing, allowing for rapid heat dissipation at both ends of the motor. Furthermore, because the motor cooling structure of this invention does not employ an internal air-cooling channel, it does not affect the internal sealing of the motor; therefore, the motor of this invention can be a sealed motor with a high explosion-proof rating.

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice. Attached Figure Description

[0015] The accompanying drawings, which form part of this specification, are used to aid in understanding this application. The content provided in the drawings and the related descriptions in this specification can be used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 This is a schematic diagram of the external structure of a motor using a motor cooling structure according to an embodiment of the present invention.

[0017] Figure 2 for Figure 1 The image shows a cross-sectional view of the motor.

[0018] Figure 3 for Figure 1The image shows a cross-sectional view of the motor housing. Detailed Implementation

[0019] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0020] The technical solutions and features provided in the various sections, including the following description, can be combined with each other without conflict. Furthermore, where possible, these technical solutions, features, and related combinations can be given specific technical subject matter and protected by relevant patents.

[0021] The embodiments of the present invention described below are generally only some embodiments and not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of patent protection.

[0022] The terms "comprising," "including," "having," and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover non-exclusive inclusion. Other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0023] Figure 1 This is a schematic diagram of the external structure of a motor using a motor cooling structure according to an embodiment of the present invention. Figure 2 for Figure 1 The image shows a cross-sectional view of the motor. Figure 3 for Figure 1 The image shows a cross-sectional view of the motor's housing. (As shown) Figures 1-3As shown, a motor cooling structure is used to cool the motor 11 of a fan 1. Specifically, it includes: a first cooling chamber 121, disposed between the outer housing 111 and the stator housing 112 of the motor 11 and located outside the end wall of the stator housing 112 in the outer region of the first end of the stator winding 113 of the motor 11, for cooling the first end portion; and a second cooling chamber 122, disposed between the outer housing 111 and the stator housing 112 of the motor 11 and located outside the second end of the stator winding 113 of the motor 11. The outer end wall of the sub-casing 112 is used to cool the second end portion; a third cooling cavity 123 is disposed between the outer casing 111 and the stator casing 112 of the motor 11 and located on the outer side wall of the stator casing 112 of the motor 11, used to cool the side wall portion; wherein, the first cooling cavity 121 and the second cooling cavity 122 are connected through the third cooling cavity 123 to form a cooling medium flow path, and the outer casing 111 is respectively provided with a cooling medium inlet 124 and a cooling medium outlet 125 communicating with the cooling medium flow path. The cooling medium used in the cooling medium flow path can be a coolant (mainly cooling water) or a cooling gas (mainly air).

[0024] More specifically, the stator housing 112 includes a stator housing body 1121, a first end cap 1122 disposed at a first end of the stator housing body 1121, and a second end cap 1123 disposed at a second end of the stator housing body; the first end cap 1122 and the stator housing body 1121 are either an integral structure or an assembled structure. Figure 2 The first end cover 1122 is used to enclose the first end of the stator winding 113 within the first end cover 1122, and the first end of the rotor 114 of the motor 11 is mounted in the first end cover 1122 via a bearing; the second end cover 1123 and the stator housing body 1121 are either an integral structure or an assembled structure. Figure 2 The diagram shows the assembly structure. The second end cover 1123 is used to enclose the second end of the stator winding 113 within the second end cover 1123. The second end of the rotor 114 of the motor 11 is mounted in the second end cover 1123 via a bearing. The first cooling chamber 121 is disposed outside the first end cover 1122 and contacts the end face of the first end cover 1122. The second cooling chamber 122 is disposed outside the second end cover 1123 and contacts the end face of the second end cover 1123. Figure 2As shown, when the motor 11 is used for the fan 1, the second end of the rotor 114 extends out of the second end cover 1123 and is equipped with an impeller 13, and the outside of the impeller 13 is provided with a volute 14.

[0025] As can be seen, the motor cooling structure of the present invention can cool the side walls and end walls of the stator housing 112 of the motor 11. Since the first cooling cavity 121 and the second cooling cavity 122 are respectively located near the two ends of the stator winding 113, they can effectively carry away the heat inside the stator housing 112, allowing for rapid heat dissipation at both ends of the motor. Simultaneously, since the motor cooling structure of the present invention does not employ an air-cooling channel located inside the motor, it does not affect the internal sealing of the motor. Therefore, the motor of the present invention can be a sealed motor with a high explosion-proof rating.

[0026] like Figure 2 As shown, in a preferred embodiment, the first cooling cavity 121 is a first annular cavity coaxially arranged with the stator housing 112, the second cooling cavity 122 is a second annular cavity coaxially arranged with the stator housing 112, and the third cooling cavity 123 is a third annular cavity coaxially arranged with the stator housing 112. The first annular cavity and the second annular cavity are connected through the third annular cavity. The first annular cavity, the second annular cavity, and the third annular cavity have large heat exchange areas, which can better ensure the cooling effect.

[0027] like Figures 2-3 As shown, in a preferred embodiment, the cooling medium inlet 124 and the cooling medium outlet 125 are respectively disposed on the end wall of the first end of the outer casing 111 and are respectively connected to the first cooling cavity 121; a positioning and diverting flange 115 is provided between the outer casing 111 and the stator housing 112 to divide the cooling medium flow path into an input side flow path connected to the cooling medium inlet 124 and an output side flow path connected to the cooling medium outlet 125; a portion of the first cooling cavity 121 and a portion of the third cooling cavity 123 are separated into an input side flow path by the positioning and diverting flange 115, and another portion of the first cooling cavity 121 and another portion of the third cooling cavity 123 are separated into an output side flow path by the positioning and diverting flange 115; the second cooling cavity 122 does not have the positioning and diverting flange 115, thus serving as an intermediate channel connecting the input side flow path and the output side flow path.

[0028] In this way, the cooling medium will flow through the cooling medium flow path as follows: First, the cooling medium enters the input side flow path in the first cooling chamber 121 from the cooling medium inlet 124, and then enters the second cooling chamber 122 after passing through the input side flow paths in the first cooling chamber 121 and the third cooling chamber 123 respectively, and flows from bottom to top in the second cooling chamber 122 (if...). Figure 2 (the direction), and then enters the output side flow path of the third cooling chamber 123 and flows out from the cooling medium output port 125 after passing through the output side flow path in the first cooling chamber 121.

[0029] like Figure 3 As shown, the positioning and diversion flange 115 is arranged laterally (to... Figure 3 (the orientation), so that the positioning and diversion flange 115 can simultaneously divide the first annular cavity and the third annular cavity into a first semi-annular cavity and a second semi-annular cavity. The first semi-annular cavity is connected to the cooling medium inlet 124, and the second semi-annular cavity is connected to the cooling medium outlet 125.

[0030] like Figures 1-3 As shown, in a preferred embodiment, the first and / or second ends of the stator housing 112 further have a hollow convex annular structure 1124. The first and / or second ends of the stator winding 113 of the motor 11 are located in the corresponding hollow convex annular structure 1124. The outer end wall of the hollow convex annular structure 1124 constitutes the end wall of the stator housing 112. The first cooling cavity 121 and / or the second cooling cavity 122 cover the outside of the outer end wall of the corresponding hollow convex annular structure 1124 and are connected to the third cooling cavity 123 through a first flow channel 126 located in the housing of the corresponding hollow convex annular structure 1124.

[0031] Therefore, the diameter and area of ​​the end wall of the stator housing 112 can be significantly enlarged by the hollow convex annular structure 1124, which greatly increases the heat exchange area of ​​the first cooling cavity 121 and / or the second cooling cavity 122, and further improves the cooling effect.

[0032] Furthermore, a flange 1111 may be provided on the outer casing 111. The flange 1111 can be fastened to the casing corresponding to the hollow convex annular structure 1124 by bolts, so that the outer casing 111 and the stator casing 112 can be assembled. A second flow channel 127 may be formed in the flange 1111 to connect the first flow channel 126 and the third cooling cavity 123.

[0033] In addition, a drive circuit 116 (located on a drive circuit board) for the motor 11 is installed between the flange 1111 and the corresponding hollow convex ring structure 1124 and / or in the hollow convex ring structure 1124. The flange body 1111 has a drive circuit installation and maintenance operation hole 1112.

[0034] The foregoing has described the relevant content of the present invention. Those skilled in the art will be able to implement the present invention based on these descriptions. All other embodiments obtained by those skilled in the art based on the foregoing content of this specification without inventive effort should fall within the scope of the present invention.

Claims

1. A motor cooling structure, characterized in that, include: A first cooling chamber is disposed between the outer housing and the stator housing of the motor and located outside the end wall of the stator housing in the outer region of the first end of the stator winding of the motor, for cooling the first end portion. The second cooling chamber is disposed between the outer housing and the stator housing of the motor and located outside the end wall of the stator housing in the outer region of the second end of the stator winding of the motor, and is used to cool the second end portion. The third cooling chamber is disposed between the outer housing and the stator housing of the motor and located in the outer region of the side wall of the stator housing of the motor, for cooling the side wall portion; The first cooling cavity and the second cooling cavity are connected through the third cooling cavity to form a cooling medium flow path. The outer shell is respectively provided with a cooling medium inlet and a cooling medium outlet that are connected to the cooling medium flow path. The first and / or second ends of the stator housing have hollow convex annular structures. The first and / or second ends of the stator winding of the motor are located in the corresponding hollow convex annular structures. The outer end wall of the hollow convex annular structure constitutes the end wall of the stator housing. The first and / or second cooling chambers cover the outside of the outer end wall of the corresponding hollow convex annular structure and are connected to the third cooling chamber through a first flow channel located in the housing of the corresponding hollow convex annular structure. The outer shell is provided with a flange, which is fastened to the shell corresponding to the hollow convex ring structure by bolts; The flange has a second flow channel for connecting the first flow channel with the third cooling cavity.

2. The motor cooling structure as described in claim 1, characterized in that: The stator housing includes a stator housing body, a first end cap disposed at a first end of the stator housing body, and a second end cap disposed at a second end of the stator housing body. The first end cover and the stator housing body are an integral structure or an assembly structure. The first end cover is used to enclose the first end of the stator winding in the first end cover. The first end of the motor rotor is mounted in the first end cover by a bearing. The second end cover and the stator housing body are an integral structure or an assembly structure. The second end cover is used to enclose the second end of the stator winding inside the second end cover. The second end of the motor rotor is mounted in the second end cover by a bearing. The first cooling chamber is disposed outside the first end cover and in contact with the end face of the first end cover, and the second cooling chamber is disposed outside the second end cover and in contact with the end face of the second end cover.

3. The motor cooling structure as described in claim 1, characterized in that: The first cooling cavity has a first annular cavity coaxially arranged with the stator housing, the second cooling cavity has a second annular cavity coaxially arranged with the stator housing, and the third cooling cavity has a third annular cavity coaxially arranged with the stator housing. The first annular cavity and the second annular cavity are connected through the third annular cavity.

4. The motor cooling structure as described in claim 1, characterized in that: The cooling medium used in the cooling medium flow path is either coolant or cooling gas.

5. The motor cooling structure as described in claim 1, 2, 3 or 4, characterized in that: The cooling medium inlet and the cooling medium outlet are respectively located on the end wall of the first end of the outer casing and are respectively connected to the first cooling cavity; A positioning and diverting flange is provided between the outer shell and the stator shell to divide the cooling medium flow path into an input side flow path connected to the cooling medium inlet and an output side flow path connected to the cooling medium outlet. A portion of the first cooling cavity and a portion of the third cooling cavity are separated into input-side flow paths by the positioning and diversion flange, and another portion of the first cooling cavity and another portion of the third cooling cavity are separated into output-side flow paths by the positioning and diversion flange. The second cooling cavity does not have the positioning and diversion flange to serve as an intermediate channel connecting the input flow path and the output flow path.

6. The motor cooling structure as described in claim 5, characterized in that: The first cooling cavity has a first annular cavity coaxially arranged with the stator housing, the second cooling cavity has a second annular cavity coaxially arranged with the stator housing, and the third cooling cavity has a third annular cavity coaxially arranged with the stator housing. The first annular cavity and the second annular cavity are connected through the third annular cavity. The positioning and diversion flange simultaneously divides the first annular cavity and the third annular cavity into a first semi-annular cavity and a second semi-annular cavity. The first semi-annular cavity is connected to the cooling medium inlet, and the second semi-annular cavity is connected to the cooling medium outlet.

7. The motor cooling structure as described in claim 1, characterized in that: The drive circuit of the motor is installed between the flange and the corresponding hollow convex ring structure and / or in the hollow convex ring structure, and the flange body is provided with a drive circuit installation and maintenance operation hole.

Images