Axial motor cooling structure and axial motor

Abstract

The invention relates to the technical field of motors, and discloses an axial motor cooling structure and an axial motor, and the axial motor cooling structure comprises a support which is composed of a cylinder, a first supporting rod and a second supporting rod; the cylinder and two adjacent groups of first support rods and second support rods support and fix the stator winding; a first flow channel is formed among a group of first supporting rods, a group of second supporting rods, two adjacent stator windings and the outside of the cylinder; a second flow channel for communicating two adjacent first flow channels is arranged in the cylinder; a third flow channel is arranged in the machine shell, and the third flow channel communicates with the two adjacent first flow channels. Coolant flows in the first flow channel, the second flow channel and the third flow channel. The stator winding is supported and fixed through the support, the first flow channel is arranged between the support and the stator winding, heat generated by the stator winding is directly conducted out through the coolant when the axial motor operates, the purpose of efficient heat exchange is achieved, the temperature of the axial motor is lowered as soon as possible, stable and reliable operation of the axial motor is guaranteed, and the service life of the axial motor is prolonged. And the purpose of bracket reuse is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an axial motor cooling structure and an axial motor. Background Art

[0002] Compared with other types of motors, permanent magnet synchronous motors have larger output power. Permanent magnet synchronous motors can be divided into axial magnetic field permanent magnet motors and radial magnetic field permanent magnet motors according to the structure of the magnetic circuit. Compared with radial magnetic field permanent magnet motors, axial magnetic field permanent magnet motors have a flat structure, a closed and compact internal space, and a smaller volume; axial magnetic field permanent magnet motors have higher power density and efficiency. However, when the axial magnetic field permanent magnet motor is running, the heat generated is difficult to volatilize in time. Continuous high temperature will cause the permanent magnets of the axial magnetic field permanent magnet motor to demagnetize, which will reduce the reliability and safety of the axial magnetic field permanent magnet motor, and have a serious adverse effect on the overall performance of the axial magnetic field permanent magnet motor. Summary of the invention

[0003] In view of this, the present invention provides an improved axial motor cooling structure to solve the problem that the heat generated by the axial magnetic field permanent magnet motor during operation is difficult to volatilize in time, and the continuous high temperature causes the permanent magnets of the axial magnetic field permanent magnet motor to demagnetize, which reduces the reliability and safety of the axial magnetic field permanent magnet motor and has a serious adverse effect on the overall performance of the axial magnetic field permanent magnet motor.

[0004] In a first aspect, the present invention provides an improved axial motor cooling structure, comprising: a bracket, which is composed of a cylinder located in the center and a plurality of first support rods and a plurality of second support rods connected to the outer circumference of the cylinder and extending outward; the plurality of first support rods are distributed at intervals in the front part along the circumferential direction, and the plurality of second support rods are distributed at intervals in the rear part along the circumferential direction; the plurality of first support rods located in the front part and the plurality of second support rods located in the rear part correspond to each other one by one; the outside of the cylinder and two adjacent groups of first support rods and second support rods are suitable for supporting and fixing a stator core wound with a stator winding; a first flow channel is formed between a group of first support rods and second support rods corresponding to each other in front and back, two adjacent stator windings and the outside of the cylinder; a second flow channel connecting the two adjacent first flow channels is provided inside the cylinder between the two adjacent first flow channels;

[0005] The casing is suitable for supporting and fixing the outside of the stator winding; a third flow channel is provided inside the casing, and the third flow channel is connected to two adjacent first flow channels; coolant flows in the first flow channel, the second flow channel and the third flow channel. Beneficial effect: The present application adopts the above technical solution, not only by supporting and fixing the stator core and the stator winding through the bracket, but also by setting the first flow channel between the bracket and the stator winding. When the axial motor is running, the heat generated by the stator winding is directly conducted out through the coolant faster and more comprehensively, so as to achieve the purpose of efficient heat exchange, so as to reduce the temperature of the axial motor as soon as possible, ensure the stable and reliable operation of the axial motor, and achieve the purpose of bracket reuse. In addition, unlike the one-piece stator core, the stator core described in the present application adopts a modular design and has no yoke structure, which can not only reduce the weight of the stator core and improve the power density of the axial motor, but also reduce the iron loss of the stator core, further achieving the purpose of reducing the temperature rise of the axial motor.

[0006] Optionally, the coolant flows into the third flow channel through a coolant inlet, and the coolant flows out of the third flow channel through a coolant outlet.

[0007] Optionally, the coolant is an insulating fluid. Beneficial effects: The present application adopts the above technical solution, and by limiting the coolant to an insulating fluid, the coolant is prevented from affecting the working state of the stator winding.

[0008] Optionally, the bracket and the housing are integrally arranged. Beneficial effects: The present application adopts the above technical solution to enhance the overall strength of the axial motor cooling structure.

[0009] Optionally, the coolant is cooling oil.

[0010] Optionally, the axial motor cooling structure adopts negative pressure oil supply. Beneficial effect: The present application adopts the above technical solution, and the use of negative pressure oil supply can effectively avoid the problem of increased internal pressure caused by injection pulses and increased internal flow during conventional cooling oil cooling.

[0011] Optionally, the stator winding adopts fractional-slot concentrated winding.

[0012] In a second aspect, the present invention further provides an axial motor, comprising: the axial motor cooling structure described above.

[0013] Optionally, the axial motor is a synchronous motor.

[0014] Optionally, it also includes:

[0015] stator core;

[0016] A stator winding, wound around the outside of the stator core;

[0017] A front baffle, fixedly and closedly mounted on the front opening of the housing to protect the stator core and the stator winding;

[0018] The rear baffle is fixedly installed and sealed on the rear opening of the housing to protect the stator core and the stator winding. Beneficial effect: The present application adopts the above technical solution, and by setting the front baffle and the rear baffle, it can not only protect the stator core and the stator winding, but also prevent the bracket from being damaged, and further prevent the coolant from flowing out of the axial motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 Schematic diagram of the three-dimensional structure of the axial motor cooling structure provided in an embodiment of the present invention Figure 1 ;

[0021] Figure 2 Schematic diagram of the three-dimensional structure of the axial motor cooling structure provided in an embodiment of the present invention Figure 2 ;

[0022] Figure 3 A schematic diagram of the three-dimensional structure of a bracket provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a three-dimensional cross-sectional structure of a bracket provided in an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a three-dimensional cross-sectional structure of an axial motor cooling structure provided in an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the connection structure of the flow channel provided in an embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of a partial three-dimensional structure of an axial motor provided in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Casing; 2. Stator core; 3. Stator winding; 4. Bracket; 5. Coolant inlet; 6. Coolant outlet; 7. Front baffle; 8. Rear baffle; 9. Cylinder; 10. First support rod; 11. Second support rod; 12. First flow channel; 13. Second flow channel; 14. Third flow channel. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0030] The temperature rise of the motor is an important indicator that affects the performance of the motor. Therefore, it is very necessary to study the temperature field of the motor and cool it efficiently. The temperature rise of the motor is the main factor limiting the maximum output power of the motor. A higher temperature rise directly reduces the insulation performance of the stator winding. At present, the cooling methods of the motor mainly include: natural cooling, forced air cooling and liquid cooling. During the operation of the motor, a lot of heat will be generated due to copper loss, iron loss and mechanical loss. The temperature of the end of the stator winding of the motor is usually the highest point of the motor temperature. Therefore, the temperature of the end of the stator winding of the motor determines the working performance of the entire motor. At present, in order to solve the heat dissipation problem of the end of the stator winding, the following solutions are mainly included: first, optimization through electromagnetic design; second, using a special manufacturing process; third, using a special cooling method to cool the end of the motor stator winding to improve the heat conduction capacity. The technical solution of this application makes minor changes on the basis of not changing the overall structure of the motor, and proposes an improved axial motor cooling structure with low cost.

[0031] like Figures 1 to 6 A specific implementation of the axial motor cooling structure shown includes: a bracket 4 and a housing 1. The full name of the axial motor is an axial permanent magnet motor or an axial magnetic field permanent magnet motor.

[0032] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, the bracket 4 is composed of a cylinder 9 located in the center and a plurality of first support rods 10 and a plurality of second support rods 11 connected to the outer circumference of the cylinder 9 and extending outward; the plurality of first support rods 10 are distributed at intervals in the front along the circumferential direction, and the plurality of second support rods 11 are distributed at intervals in the rear along the circumferential direction; the plurality of first support rods 10 located in the front and the plurality of second support rods 11 located in the rear correspond to each other one by one; the outside of the cylinder 9 and two adjacent groups of first support rods 10 and second support rods 11 are suitable for supporting and fixing the stator core 2 wound with the stator winding 3; a first flow channel 12 is formed between a group of first support rods 10 and second support rods 11 corresponding to each other in front and back, two adjacent stator windings 3 and the outside of the cylinder 9; a second flow channel 13 connecting the two adjacent first flow channels 12 is provided inside the cylinder 9 between the two adjacent first flow channels 12. The housing 1 is suitable for supporting and fixing the outside of the stator winding 3; a third flow channel 14 is provided inside the housing 1, and the third flow channel 14 is connected to two adjacent first flow channels; coolant flows in the first flow channel 12, the second flow channel 13 and the third flow channel 14, and the first flow channel 12, the second flow channel 13 and the third flow channel 14 are collectively referred to as flow channels. Specifically, the coolant is an insulating fluid, and the coolant can be cooling oil. The coolant flows into the third flow channel 14 through the coolant inlet 5, and the coolant flows out of the third flow channel 14 through the coolant outlet 6.

[0033] like Figure 1 As shown, a plurality of stator cores 2 are respectively wound in a plurality of stator windings 3. Specifically, the stator winding 3 adopts fractional slot concentrated winding.

[0034] Further, such as Figure 2 and Figure 3 As shown, the bracket 4 and the housing 1 are integrally arranged and can be welded into one piece by a welding process; the axial motor cooling structure adopts a negative pressure oil supply method.

[0035] like Figure 1 and Figure 6 As shown, the cooling oil of the axial motor cooling structure described in the present application first flows into the third flow channel 14 from the coolant inlet 5, and then flows from the third flow channel 14 in the casing 1 along the first flow channel 12 on one side of the stator winding 3 to the second flow channel 13. Then, the cooling oil flows from the second flow channel 13 to the first flow channel 12 on the other side of the stator winding 3, and then flows back to another section of the third flow channel 14. Referring to the above method, the cooling oil flows roughly along the circumferential direction around the central axis of the axial motor until the cooling oil flows out from the coolant outlet 6. This cycle is repeated, and finally multiple stator windings 3 are fully cooled.

[0036] like Figure 7 As shown, and reference Figure 1The present invention further provides an axial motor, comprising: the axial motor cooling structure, the stator core 2, the stator winding 3, the front baffle 7 and the rear baffle 8. The stator winding 3 is wound on the outside of the stator core 2. The front baffle 7 is fixedly and closedly installed on the front opening of the housing 1 to protect the stator core 2 and the stator winding 3; the rear baffle 8 is fixedly and closedly installed on the rear opening of the housing 1 to protect the stator core 2 and the stator winding 3.

[0037] Specifically, the axial motor is a synchronous motor.

[0038] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An axial motor cooling structure, characterized in that: include: The support (4) is composed of a cylinder (9) located at the center and a plurality of first support rods (10) and a plurality of second support rods (11) connected to the outer circumference of the cylinder (9) and extending outward; the plurality of first support rods (10) are distributed at intervals at the front along the circumferential direction, and the plurality of second support rods (11) are distributed at intervals at the rear along the circumferential direction; the plurality of first support rods (10) located at the front and the plurality of second support rods (11) located at the rear correspond to each other one by one; the outside of the cylinder (9) and two adjacent groups of first support rods (10) and second support rods (11) are suitable for supporting and fixing a stator core (2) wound with a stator winding (3); a first flow channel (12) is formed between a group of first support rods (10) and second support rods (11) corresponding to each other in front and back, two adjacent stator windings (3) and the outside of the cylinder (9); a second flow channel (13) communicating with the two adjacent first flow channels (12) is provided inside the cylinder (9) between the two adjacent first flow channels (12); A casing (1) is suitable for supporting and fixing the outside of the stator winding (3); a third flow channel (14) is provided inside the casing (1), and the third flow channel (14) is connected to two adjacent first flow channels; and a coolant flows in the first flow channel (12), the second flow channel (13) and the third flow channel (14).

2. The axial motor cooling structure according to claim 1, characterized in that: The coolant flows into the third flow channel (14) through the coolant inlet (5), and flows out of the third flow channel (14) through the coolant outlet (6).

3. The axial motor cooling structure according to claim 1, characterized in that: The coolant is an insulating fluid.

4. The axial motor cooling structure according to claim 1, characterized in that: The bracket (4) and the casing (1) are integrally arranged.

5. The axial motor cooling structure according to any one of claims 1 to 4, characterized in that: The coolant is cooling oil.

6. The axial motor cooling structure according to claim 5, characterized in that: The axial motor cooling structure adopts a negative pressure oil supply method.

7. The axial motor cooling structure according to any one of claims 1 to 4, characterized in that: The stator winding (3) adopts fractional slot concentrated winding.

8. An axial motor, characterized in that: include: An axial motor cooling structure according to any one of claims 1 to 7.

9. The axial motor according to claim 8, characterized in that: The axial motor is a synchronous motor.

10. The axial motor according to claim 8, characterized in that Also includes: stator core (2); A stator winding (3) is wound around the outside of the stator core (2); A front baffle (7) is fixedly installed to close the front opening of the housing (1) to protect the stator core (2) and the stator winding (3); A rear baffle (8) is fixedly installed and sealed on the rear opening of the casing (1) to protect the stator core (2) and the stator winding (3).

Images