Cooling structure for motor flat wire winding

Abstract

The invention specifically discloses a cooling structure for a motor flat wire winding. The cooling structure comprises two cooling clamping rings correspondingly arranged on windings at the two ends of a wire inserting stator; the cooling snap ring is of a hollow structure and is provided with an oil inlet pipe, and the oil inlet pipe is communicated with an inner cavity of the cooling snap ring; oil injection holes are uniformly formed in the inner side surface of the cooling snap ring, and are radially distributed towards the stator winding; the cooling clamping ring is arranged on the upper portion of the stator winding in a surrounding mode, a refrigerant enters the inner cavity from the oil inlet pipe, oil liquid is evenly dispersed through impact of the oil liquid in the radial direction and the axial direction, then the refrigerant is sprayed to the stator winding in the radial direction through the oil spraying holes, the refrigerant flows from top to bottom along the stator winding, and then the winding on the lower portion is cooled. The stator cooling efficiency of the motor can be improved, and the cooling performance of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor cooling, and more particularly to a cooling structure for a flat wire winding of a motor. Background Art

[0002] At present, the market share of new energy vehicles is gradually increasing. Combined with the national requirements for the development of energy-saving technology routes for the new energy industry, the drive motor technology is developing towards higher efficiency and higher power density. As the main power source, the output characteristics of the drive motor are strongly related to the cooling system capacity of the motor itself. Therefore, the cooling method of the motor has developed from natural air cooling in the early stage to indirect water cooling, and then to direct oil cooling. The improvement of the cooling method enables the motor to output greater characteristics in a smaller volume, which can better match the development needs of small volume and high efficiency. Under high power demand, the higher current (generally above 400A) of the automotive drive motor will generate a lot of heat. Due to the limitations of the assembly structure and manufacturing tolerances, there is uneven cooling of the stator and rotor. Uneven cooling of the motor will cause local heat to be unable to be taken away in time, affecting the life and reliability of the motor. At present, oil spray ring spray and oil spray pipe spray are commonly used to achieve stator cooling, but the oil spray ring / oil spray pipe has a single axial cooling point position, and is easily affected by the manufacturing tolerance of components, and cannot cover the entire end. There is inaccurate cooling, which is easy to cause excessive demand for cooling oil and waste. Therefore, how to improve the uniformity and efficiency of the stator cooling of the motor is of great significance. Summary of the invention

[0003] The present invention provides a cooling structure for a motor flat wire winding, which solves the problems of uneven stator cooling and energy waste in the existing drive motor, can improve the stator cooling efficiency of the motor, and enhances the cooling performance of the motor.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A cooling structure for a flat wire winding of a motor, comprising: two cooling clamping rings correspondingly arranged on the windings at both ends of an embedded wire stator;

[0006] The cooling clamp ring is a hollow structure, and is provided with an oil inlet pipe, which is connected to the inner cavity of the cooling clamp ring;

[0007] The inner side surface of the cooling clamp ring is evenly arranged with oil injection holes, and the oil injection holes are radially distributed facing the stator winding;

[0008] The cooling clamp ring is arranged around the upper part of the stator winding, and the refrigerant enters the inner cavity from the oil inlet pipe. The oil is evenly dispersed through the radial and axial impact of the oil, and then the refrigerant is radially sprayed on the stator winding through the oil spray hole, so that the refrigerant flows from top to bottom along the stator winding, thereby cooling the lower winding.

[0009] Preferably, the cooling clamp is an arc-shaped structure, and the corresponding arc angle is greater than 180°.

[0010] Preferably, the oil injection hole is in a long strip structure.

[0011] Preferably, the oil injection hole is vertically arranged on the inner cylindrical surface of the cooling clamp ring.

[0012] Preferably, the oil inlet pipe is arranged in the middle position of the cooling clamp ring, so that the refrigerant enters the inner cavity through the oil inlet pipe and flows to both sides.

[0013] Preferably, it also includes: a protrusion; the protrusions are arranged at a specific angle on the inner cylindrical surface of the cooling clamp, and fine holes are arranged on the surface of the protrusion, and the refrigerant in the inner cavity is sprayed outward through the fine holes and the oil injection hole.

[0014] Preferably, the protrusion is arranged above the oil injection hole.

[0015] Preferably, the protrusions and the oil injection holes are arranged in a staggered manner or in a one-to-one correspondence.

[0016] Preferably, the protrusion is a trapezoidal structure.

[0017] Preferably, the fine holes are arranged on different sides of the protrusion.

[0018] The present invention provides a cooling structure for a flat wire winding of a motor, wherein a cooling clamp is arranged around the upper part of the stator winding, and the oil spray hole on the inner side of the cooling clamp radially sprays a refrigerant to the stator winding, so that the refrigerant flows from top to bottom along the stator winding, thereby cooling the lower winding. The problem of uneven stator cooling and energy waste in the existing drive motor is solved, and the stator cooling efficiency of the motor is improved, thereby improving the cooling performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0020] Figure 1 It is a schematic diagram of a cooling structure for a motor flat wire winding provided by the present invention.

[0021] Figure 2 The invention provides an exploded schematic diagram of a cooling structure for a flat wire winding of a motor.

[0022] Figure 3 It is a schematic diagram of a cooling clamp ring provided in an embodiment of the present invention.

[0023] Figure 4It is a schematic diagram of the flow direction of the refrigerant in the cooling clamp ring provided in an embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of a cooling clamp ring with a protrusion provided in an embodiment of the present invention.

[0025] Figure 6 The embodiment of the present invention provides Figure 5 A magnified schematic diagram of the A mark in the middle.

[0026] Figure 7 The invention is a schematic diagram of the installation of a cooling clamp ring and a welding end of a motor stator provided in an embodiment of the invention. DETAILED DESCRIPTION

[0027] In order to enable persons skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0028] In view of the problems of uneven cooling and energy waste in current motor stator cooling, the present invention provides a cooling structure for motor flat wire windings, which solves the problems of uneven cooling and energy waste in existing drive motor stators, can improve the stator cooling efficiency of the motor, and enhance the cooling performance of the motor.

[0029] like Figure 1 to Figure 7 As shown, a cooling structure for a motor flat wire winding comprises: two cooling clamps 1 which are correspondingly arranged on the windings at both ends of an embedded wire stator 3; the cooling clamp 1 is a hollow structure, and is provided with an oil inlet pipe 4, and the oil inlet pipe 4 is communicated with the inner cavity of the cooling clamp 1; the inner side surface of the cooling clamp 1 is evenly arranged with oil injection holes 101, and the oil injection holes 101 are radially distributed facing the stator winding 2; the cooling clamp 1 is arranged around the upper part of the stator winding 2, and the refrigerant enters the inner cavity from the oil inlet pipe 4, and the oil is evenly dispersed through the impact of radial and axial oil, and then the refrigerant is radially sprayed to the stator winding through the oil injection holes 101, so that the refrigerant flows from top to bottom along the stator winding, thereby cooling the lower winding.

[0030] Specifically, Figures 1 to 4 As shown, for the non-welded end of the motor stator, the cooling clamp is assembled through the outer circle of the motor stator and installed on the upper part of the embedded wire stator, that is, the upper part in the vertical direction after the embedded wire stator is installed and fixed. The inner cylindrical surface of the cooling clamp is provided with an oil injection hole 101. The refrigerant enters the inner cavity of the cooling clamp from the oil inlet pipe 4 and is then sprayed out from the oil injection hole 101 to radially spray the winding at the end of the stator, so that after the refrigerant sprayed from the oil injection hole 101 cools the nearby upper winding, the refrigerant will flow downward and then cool the lower winding to ensure that the entire end winding can be effectively and directly cooled.

[0031] Furthermore, the cooling clamp ring 1 is an arc-shaped structure, and its corresponding arc angle is greater than 180°. The arc-shaped structure of the cooling clamp ring can be used to design an avoidance space for the three-phase lead wires and the busbar.

[0032] Furthermore, the oil injection hole 101 is in an elongated strip structure, which increases the axial oil injection range and improves the cooling effect.

[0033] Furthermore, the oil injection hole 101 is vertically arranged on the inner cylindrical surface of the cooling clamp ring.

[0034] Furthermore, the oil inlet pipe is arranged at the middle position of the cooling clamp ring, so that the refrigerant enters the inner cavity through the oil inlet pipe and flows to both sides.

[0035] In actual application, the refrigerant enters the inner cavity of the cooling clamp 1 through the oil inlet pipe 4 and fills the hollow cavity inside it on both sides. Then the refrigerant is sprayed out from the oil injection hole 101 on the inner cylindrical surface of the cooling clamp 1 to cool the upper part of the winding 2; then under the action of gravity, the refrigerant flows from the upper part of the winding to the lower part to achieve cooling of the entire circle of the winding.

[0036] like Figure 5~Figure 7 As shown, the cooling structure also includes: a protrusion; protrusions 102 are arranged at a specific angle on the inner cylindrical surface of the cooling clamp 1, and fine holes 103 are arranged on the surface of the protrusion 102. The refrigerant in the inner cavity is sprayed outward through the fine holes and the oil injection hole.

[0037] In one embodiment, for a motor stator with a welding end, in order to increase the cooling effect of the refrigerant, combined with the structure of the stator winding, for the cooling of the welding end, a protrusion 102 arranged at a specific angle can be designed on the inner cylindrical surface of the cooling junction clamp, and the surface of the protrusion 102 is arranged with fine pores 103. The protrusions arranged on the inner cylindrical surface of the cooling clamp are designed based on the number of stator slots and the gap. The protrusions are characterized by long strips, and the surface of the protrusions is arranged with fine pores 103 to achieve radial spraying of the stator winding. When viewed from the top, the radial spacing between two adjacent protrusions is the same, which is used to ensure that the outlet of the fine pores is the same as the spacing of the winding to be cooled.

[0038] Furthermore, the protrusion 102 is arranged above the oil injection hole 101 and is located at one side of the welding end of the cooling clamp ring.

[0039] Furthermore, the protrusions and the oil injection holes are arranged in a staggered manner or in a one-to-one correspondence.

[0040] Furthermore, the protrusion is a trapezoidal structure. In practical applications, the protrusion is a trapezoidal structure with a small top and a large bottom, so that adjacent protrusions are arranged with a wide outer side and a narrow center.

[0041] Furthermore, the fine holes are arranged on different sides of the protrusion.

[0042] In practical applications, the oil injection holes 101 and protrusions 102 on the cooling clamp ring 1 can be fixed at specific identical positions in the circumferential direction, and the oil can be evenly dispersed through the impact of radial and axial oil. They are generally located in the middle of the stator teeth (two flat wire slots). The radial distribution position of the protrusions 102 is related to the number of flat wire layers, and is generally set to the number of flat wire layers / 2. For example, for 6 layers of flat wire, 3 rows of oil injection holes are set. The fine holes 103 can be set as needed to achieve cooling of the winding while cooling the stator end.

[0043] It can be seen that the present invention provides a cooling structure for the flat wire winding of the motor, wherein the cooling clamp ring is arranged around the upper part of the stator winding, and the oil injection hole on the inner side of the cooling clamp ring radially sprays the refrigerant to the stator winding, so that the refrigerant flows from top to bottom along the stator winding, thereby cooling the lower winding. The problem of uneven stator cooling and energy waste in the existing drive motor can be solved, and the stator cooling efficiency of the motor can be improved, thereby improving the cooling performance of the motor.

[0044] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present invention.

Claims

1. A cooling structure for a flat wire winding of a motor, characterized in that: include: Two cooling clamps correspondingly arranged on the windings at both ends of the embedded wire stator; The cooling clamp ring is a hollow structure, and is provided with an oil inlet pipe, which is connected to the inner cavity of the cooling clamp ring; The inner side surface of the cooling clamp ring is evenly arranged with oil injection holes, and the oil injection holes are radially distributed facing the stator winding; The cooling clamp ring is arranged around the upper part of the stator winding, and the refrigerant enters the inner cavity from the oil inlet pipe. The oil is evenly dispersed through the radial and axial impact of the oil, and then the refrigerant is radially sprayed on the stator winding through the oil spray hole, so that the refrigerant flows from top to bottom along the stator winding, thereby cooling the lower winding.

2. The cooling structure for the flat wire winding of a motor according to claim 1, characterized in that: The cooling clamp ring is an arc-shaped structure, and its corresponding arc angle is greater than 180°.

3. The cooling structure for the flat wire winding of a motor according to claim 2, characterized in that: The oil injection hole is in a long strip structure.

4. The cooling structure for the flat wire winding of a motor according to claim 3, characterized in that: The oil injection hole is vertically arranged on the inner cylindrical surface of the cooling clamp ring.

5. The cooling structure for the flat wire winding of a motor according to claim 4, characterized in that: The oil inlet pipe is arranged at the middle position of the cooling clamp ring, so that the refrigerant enters the inner cavity through the oil inlet pipe and flows to both sides.

6. The cooling structure for the flat wire winding of a motor according to claim 5, characterized in that: Also includes: bulges; The protrusions are arranged at a specific angle on the inner cylindrical surface of the cooling clamp, and fine holes are arranged on the surface of the protrusions. The refrigerant in the inner cavity is sprayed outward through the fine holes and the oil injection holes.

7. The cooling structure for the flat wire winding of a motor according to claim 6, characterized in that: The protrusion is arranged above the oil injection hole.

8. The cooling structure for the flat wire winding of a motor according to claim 7, characterized in that: The protrusions and the oil injection holes are arranged in a staggered manner or in a one-to-one correspondence.

9. The cooling structure for the flat wire winding of a motor according to claim 8, characterized in that: The raised trapezoidal structure.

10. The cooling structure for the flat wire winding of a motor according to claim 9, characterized in that: The fine holes are arranged on different sides of the protrusion.

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