A cooling structure for a flat wire motor
By setting cooling holes in the flat copper wire of the stator coil of the flat wire motor, the problem of limited cooling effect of the existing liquid cooling device is solved, efficient heat dissipation and conductivity optimization is achieved, and the volume and weight of the motor are reduced.
Patent Information
- Application Number
- CN202411682464.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-04-01
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing liquid cooling devices have problems such as redundancy, time-consuming, increased cost and limited cooling effects in motor cooling.
A cooling structure of a flat wire motor is designed. By setting a cooling hole in the flat copper wire of the stator coil, the cross-section of the cooling hole is long and the two ends are widened. The cooling medium quickly takes away heat through the cooling hole.
It realizes efficient heat dissipation, avoids heat accumulation in the flat copper wire, ensures the motor to operate stably under high load, reduces overall energy consumption, and conforms to the skin effect to conductivity optimization, optimizes space utilization, and reduces the volume and weight of the motor.
Smart Images
Figure CN119742957A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of motor cooling, and in particular to a cooling structure of a flat wire motor. Background Art
[0002] Motor cooling is essential to maintain motor performance and extend its service life. Heat is generated during motor operation. If the heat cannot be dissipated in a timely and effective manner, the high temperature may cause the motor insulation material to age, performance to deteriorate, and even burn the motor. Therefore, the appropriate cooling method is a key factor in ensuring the stable operation of the motor and improving its efficiency.
[0003] The original method uses air cooling or general liquid cooling. Air cooling uses air as a cooling medium and relies on air flow to remove heat. The heat dissipation efficiency is relatively low. In some high-temperature and high-power operation scenarios, it may not meet the heat dissipation requirements of the motor, causing the motor temperature to be too high, affecting the performance and service life of the motor. The fan will generate a certain amount of noise during operation, especially when running at high speeds, which may cause certain noise interference to the working environment. When the ambient temperature is high, the heat dissipation effect of air cooling will be further reduced, resulting in difficulty in motor heat dissipation.
[0004] Liquid cooling uses coolant as a cooling medium, taking advantage of the high specific heat capacity and good thermal conductivity of the coolant to remove the heat generated by the motor. Common liquid cooling methods include circulating cooling and direct current cooling. The general liquid cooling method is to add a liquid cooling device to the outer ring of the motor silicon steel sheet. This device is redundant, time-consuming, and therefore expensive. The liquid cooling housing is installed on the motor as a whole. When the motor is running, when the motor reaches a certain temperature, the thermal expansion coefficient of the point is inconsistent with the thermal expansion coefficient of the liquid cooling housing, which will cause the motor and the liquid cooling housing to separate, thereby reducing the cooling effect. Summary of the invention
[0005] The purpose of the present invention is to solve the problem in the prior art that a liquid cooling device needs to be additionally configured on a motor, which is not only redundant, time-consuming, and increases costs, but also has a limited cooling effect.
[0006] In order to solve the above problems, the present invention provides a cooling structure of a flat wire motor, including a motor body provided with a stator coil, wherein the stator coil is formed by winding a flat copper wire, a cooling channel is provided in the flat copper wire so that the flat copper wire has a tubular structure, the cross-section of the cooling channel is long and the wide side of the cooling channel is parallel to the wide side of the flat copper wire, the middle part of the wide side direction of the cooling channel is narrowed and the two ends are widened, and the two ends of the flat copper wire are respectively provided with an inlet and an outlet connected to the cooling channel.
[0007] Compared with the prior art, the above solution has the following beneficial effects: 1. Efficient heat dissipation: A cooling channel is directly set in the flat copper wire of the stator coil, which is the main heat source. When the stator coil is powered on and generates heat, the heat of the flat copper wire can be quickly taken away by the cooling medium in the cooling channel, achieving efficient heat dissipation, avoiding heat accumulation in the flat copper wire, and ensuring stable operation of the flat copper wire under high load.
[0008] 2. Good heat dissipation effect: The widened design at both ends of the cooling channel forms a buffer, so that the flow rate of the cooling medium at both ends of the cooling channel is greater than the flow rate in the middle. The cooling medium flow rate at both ends of the cooling channel is slower and can fully exchange heat with the flat copper wire to ensure uniform heat exchange. The cooling medium flow rate in the middle of the cooling channel is faster and can quickly take away the heat, thereby improving the convective heat transfer efficiency, achieving good heat dissipation effect, reducing the overall energy consumption, and contributing to the long-term operation of the motor.
[0009] 3. Conductive optimization in accordance with the skin effect: Under high-frequency current, the current tends to concentrate on the surface of the conductor rather than the center of the conductor. Therefore, by designing the cooling channel inside the flat copper wire, the distribution of current on the outer edge of the flat copper wire is maximized, which meets the requirements of the skin effect and will not significantly reduce the conductivity of the flat copper wire.
[0010] 4. Optimize space utilization and reduce volume and weight: By setting cooling channels inside the flat copper wire, the cooling system is integrated into the motor body, without adding additional cooling devices such as heat pipes or heat fins, which significantly reduces the volume and weight of the motor.
[0011] In an improved solution, the two ends of the cooling channel in the wide side direction are rounded, and the overall shape of the cross section of the cooling channel is dumbbell-shaped. The wall transition of the dumbbell-shaped cooling channel is smooth, which reduces the sudden change of the cooling medium at the transition position where the cooling channel narrows and widens, reduces the resistance of the cooling medium flow, and effectively improves the flow stability.
[0012] In an improved solution, the ratio of the hole width h in the middle of the wide side direction of the cooling channel to the hole sections H at both ends is between 0.5 and 0.8. Within this ratio range, a better balance between the cooling and heat dissipation effect and the flow stability of the cooling medium can be achieved.
[0013] In an improved solution, the motor body is a three-phase motor, the stator coils are in three groups and are circumferentially distributed in the motor body, each group of stator coils is formed by winding a single flat copper wire, and the three groups of stator coils correspond to three phases respectively.
[0014] In an improved solution, the inlet ends of the flat copper wires of the three groups of stator coils extend to the upper side of the motor body, and the outlet ends of the flat copper wires of the three groups of stator coils extend to the lower side of the motor body, thereby making the layout more reasonable.
[0015] In an improved scheme, it also includes a liquid supply device, which is provided with a liquid supply port connected to the inlet of the flat copper wire and a liquid return port connected to the outlet of the flat copper wire. The liquid supply device provides cooling liquid to the flat copper wire through the liquid supply port, and the cooling liquid in the cooling channel is discharged to the liquid supply device through the liquid return port, so that the continuous flow of cooling liquid in the cooling channel is achieved through the liquid supply device.
[0016] In an improved solution, the coolant provided by the liquid supplier to the cooling channel is of insulating nature. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is an overall schematic diagram of a cooling structure of a flat wire motor; Figure 2 A schematic diagram of a flat copper wire and a cross section of the flat copper wire of a cooling structure of a flat wire motor; Figure 3 A schematic top view of a cooling structure of a flat wire motor; Figure 4 It is a schematic front view of a cooling structure of a flat wire motor.
[0018] Description of reference numerals: 1. Motor body; 2. Flat copper wire; 21. Cooling channel; 22. Inlet; 23. Outlet. DETAILED DESCRIPTION
[0019] It should be understood by those skilled in the art that the following embodiments are only used to explain the technical principles of the embodiments of the present application and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art may adjust them as needed to adapt to specific application scenarios.
[0020] In the description of the following embodiments, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.
[0021] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0022] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0023] See also Figure 1-Figure 4 A cooling structure of a flat wire motor provided by an embodiment of the present invention comprises a motor body 1 provided with a stator coil, the stator coil is formed by winding a flat copper wire 2, a cooling channel 21 is provided in the flat copper wire 2 so that the flat copper wire 2 has a tubular structure, the cross section of the cooling channel 21 is in the shape of an elongated strip, and the wide side of the cooling channel 21 is parallel to the wide side of the flat copper wire 2, the middle part of the wide side direction of the cooling channel 21 is narrowed and the two ends are widened, and the two ends of the flat copper wire 2 are respectively provided with an inlet 22 and an outlet 23 connected to the cooling channel 21.
[0024] The beneficial effects of the above scheme are: 1. Efficient heat dissipation: A cooling channel 21 is directly set in the flat copper wire 2 of the stator coil which is the main heat source. When the stator coil is powered on and generates heat, the heat of the flat copper wire 2 can be quickly taken away by the cooling medium in the cooling channel 21, so as to achieve efficient heat dissipation, avoid heat accumulation in the flat copper wire 2, and ensure stable operation of the flat copper wire 2 under high load.
[0025] 2. Good heat dissipation effect: The two ends of the cooling channel 21 are widened, and the widened areas at both ends of the cooling channel 21 form a buffer, so that the flow rate of the cooling medium at both ends of the cooling channel 21 is greater than the flow rate in the middle. The cooling medium flow rate at both ends of the cooling channel 21 is slower and can fully exchange heat with the flat copper wire 2 to ensure uniform heat exchange. The cooling medium flow rate in the middle of the cooling channel 21 is faster and can quickly take away heat, thereby improving the convective heat transfer efficiency, achieving good heat dissipation effect, reducing overall energy consumption, and contributing to the long-term operation of the motor.
[0026] 3. Conductive optimization in accordance with the skin effect: Under high-frequency current, the current tends to concentrate on the surface of the conductor rather than the center of the conductor. This phenomenon is called the skin effect. The skin effect makes the current density highest at the edge of the conductor and lower at the center of the conductor. Therefore, by designing the cooling channel 21 inside the flat copper wire 2, the distribution of the current at the outer edge of the flat copper wire 2 is maximized, which meets the requirements of the skin effect and will not significantly reduce the conductivity of the flat copper wire 2.
[0027] 4. Optimize space utilization and reduce volume and weight: By setting a cooling channel 21 inside the flat copper wire 2, the cooling system is integrated into the motor body 1, without adding additional cooling devices such as heat pipes or heat fins, which significantly reduces the volume and weight of the motor.
[0028] As an optimization solution for the cooling channel 21, the two ends of the cooling channel 21 in the wide side direction are rounded, and the overall shape of the cross section of the cooling channel 21 is dumbbell-shaped. The wall transition of the dumbbell-shaped cooling channel 21 is smooth, which reduces the sudden change of the cooling medium at the transition position where the cooling channel 21 narrows and widens, reduces the resistance of the cooling medium flow, and effectively improves the flow stability.
[0029] Furthermore, the ratio of the hole width h in the middle of the wide side direction of the cooling channel 21 to the hole section H at both ends is between 0.5 and 0.8, and within this ratio range, a better balance between the cooling and heat dissipation effect and the flow stability of the cooling medium can be achieved. For example, in this embodiment, the hole width h in the middle of the wide side direction of the cooling channel 21 is 0.6 cm, and the hole width at both ends of the wide side direction of the cooling channel 21 is 1 cm.
[0030] In this embodiment, the motor body 1 is a three-phase motor, and the stator coils are three groups, which are circumferentially distributed in the motor body 1. Each group of stator coils is formed by winding a single flat copper wire 2, and the three groups of stator coils correspond to three phases respectively. The circumferential distribution of the stator coils in the motor body 1 belongs to the prior art and will not be described in detail here.
[0031] The inlet 22 ends of the flat copper wires 2 of the three sets of stator coils extend to the upper side of the motor body 1 , and the outlet 23 ends of the flat copper wires 2 of the three sets of stator coils extend to the lower side of the motor body 1 , thereby making the layout more reasonable.
[0032] As a further expansion of this embodiment, a liquid supply device (not shown in the figure) is also included. The liquid supply device is provided with a liquid supply port connected to the inlet 22 of the flat copper wire 2 and a liquid return port connected to the outlet 23 of the flat copper wire 2. The liquid supply device provides coolant to the flat copper wire 2 through the liquid supply port, and the coolant in the cooling channel 21 is discharged to the liquid supply device through the liquid return port, so that the coolant in the cooling channel 21 is continuously flowing through the liquid supply device. The liquid supply device is a prior art and will not be described in detail here. The coolant provided by the liquid supply device to the cooling channel 21 is of insulating nature, such as ultrapure water, transformer oil, dimethyl silicone oil, electronic fluoride liquid, etc.
[0033] It should be noted that, in the description of the present application, the terms "inside", "outside", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application; all directional indications (such as up, down, left, right, front, back, inside, and outside) are only used to explain the relative positional relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0034] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0035] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.
Claims
1. A cooling structure for a flat wire motor, comprising a motor body (1) provided with a stator coil, characterized in that: The stator coil is formed by winding a flat copper wire (2), a cooling channel (21) is provided in the flat copper wire (2) so that the flat copper wire (2) has a tubular structure, the cross section of the cooling channel (21) is in the shape of an elongated strip, the wide side of the cooling channel (21) is parallel to the wide side of the flat copper wire (2), the middle part of the wide side of the cooling channel (21) is narrowed and the two ends are widened, and the two ends of the flat copper wire (2) are respectively provided with an inlet (22) and an outlet (23) connected to the cooling channel (21).
2. The cooling structure of the flat wire motor according to claim 1, characterized in that: Both ends of the cooling channel (21) in the width direction are circular, so that the overall shape of the cross section of the cooling channel (21) is dumbbell-shaped.
3. The cooling structure of the flat wire motor according to claim 2, characterized in that: The ratio of the hole width h in the middle of the cooling hole (21) in the wide side direction to the hole sections H at both ends is between 0.5 and 0.
8.
4. The cooling structure of the flat wire motor according to any one of claims 1 to 3, characterized in that: The motor body (1) is a three-phase motor, the stator coils are in three groups and are circumferentially distributed in the motor body (1), each group of stator coils is formed by winding a single flat copper wire (2), and the three groups of stator coils correspond to three phases respectively.
5. The cooling structure of the flat wire motor according to claim 4, characterized in that: One end of the inlet (22) of the three groups of flat copper wires (2) of the stator coils extends to the upper side of the motor body (1), and one end of the outlet (23) of the three groups of flat copper wires (2) of the stator coils extends to the lower side of the motor body (1).
6. The cooling structure of the flat wire motor according to claim 5, characterized in that: It also includes a liquid supply device, the liquid supply device is provided with a liquid supply port connected to the inlet (22) of the flat copper wire (2) and a liquid return port connected to the outlet (23) of the flat copper wire (2), the liquid supply device provides cooling liquid to the flat copper wire (2) through the liquid supply port, and the cooling liquid in the cooling channel (21) is discharged to the liquid supply device through the liquid return port.
7. The cooling structure of the flat wire motor according to claim 1, characterized in that: The coolant provided by the liquid supplier to the cooling channel (21) has insulating properties.