Flat wire winding and motor thereof

Abstract

The utility model provides a flat wire winding and a motor thereof, and relates to the technical field of related structures of motor windings, the flat wire winding comprises at least two sub-conductor flat wires which are equally divided according to the cross sectional area of a traditional single flat wire winding, and the sub-conductor flat wires are connected in parallel and combined into an integral flat wire winding. Wherein the sub-conductor flat wire comprises a depainting part and an insulating part, and the depainting part is located at the free end of the sub-conductor flat wire and is not covered with insulating paint to form a parallel connection conduction point of the sub-conductor flat wire; the surface of the insulating part is coated with an inner-layer insulating paint film; and the contact surface of the integral flat wire winding and an external conductor is coated with an outer layer insulating paint film. On the premise of keeping the overall resistance unchanged, the cross sectional area of the single sub-conductor flat wire can be greatly reduced, so that the skin effect is reduced, the motor efficiency is improved, and the copper loss is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of motor winding structure, specifically to a flat wire winding and its motor. Background Technology

[0002] With the continuous development of new energy vehicle technology, the requirements for electric drive systems are becoming increasingly stringent, especially in terms of efficiency, power density, and heat dissipation performance. To meet these demands, flat wire winding technology has gradually become a research hotspot.

[0003] Currently, the motor windings of electric drive systems are generally flat wire windings. Compared with multi-strand round wire windings, their advantages are:

[0004] Larger high-efficiency range: Due to the geometry of the flat wire winding, the slot fill factor is higher, and more copper is used for the same slot area, thus enabling efficient operation over a wider range of speeds and torques.

[0005] Higher heat dissipation efficiency: The flat shape of the flat wire winding increases the surface area and improves heat transfer performance, which helps the motor to dissipate heat quickly when working under high load and reduces temperature rise.

[0006] Higher power density: Flat wire windings can achieve a higher slot fill factor in a limited space, meaning the winding occupies a higher proportion of the space, which helps to improve the power density of the motor.

[0007] However, flat wire windings also present some challenges and limitations, the most significant of which is the skin effect. The cross-sectional area of ​​a single flat wire winding is relatively large, making the skin effect more pronounced. This leads to uneven current distribution, increases the winding resistance, thereby increasing copper losses and reducing motor efficiency.

[0008] Therefore, it is evident that designing a novel flat wire winding to reduce its skin effect is a problem worthy of study. Utility Model Content

[0009] To solve the above-mentioned technical problems, this utility model provides a flat wire winding, comprising at least two sub-conductor flat wires formed by equally dividing the cross-sectional area of ​​a conventional single flat wire winding, wherein the sub-conductor flat wires are connected in parallel to form an integral flat wire winding, wherein:

[0010] The sub-conductor flat wire includes a stripped section and an insulating section. The stripped section is located at the free end of the sub-conductor flat wire and is not covered with insulating varnish to form a parallel conduction point of the sub-conductor flat wire. The surface of the insulating section is covered with an inner layer of insulating varnish film.

[0011] The contact surface between the integral flat wire winding and the external conductor is covered with an outer insulating varnish film.

[0012] Furthermore, the thickness of the inner insulating varnish film ranges from 0.03 to 0.05 mm.

[0013] Furthermore, the thickness of the outer insulating varnish film ranges from 0.08 to 0.12 mm.

[0014] Furthermore, the aspect ratio of the integral flat wire winding is 0.2-0.5.

[0015] Preferably, the integral flat wire winding is in the form of a hairpin or an I-pin.

[0016] Furthermore, all the sub-conductor flat wires are made of the same material and have the same dimensions.

[0017] An electric motor has stator slots in which the flat wire windings are disposed.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention uses at least two sub-conductor flat wires, which are formed by dividing the cross-sectional area of ​​a traditional single flat wire winding equally, and then connects the sub-conductor flat wires in parallel to form an integral flat wire winding. This can greatly reduce the cross-sectional area of ​​a single sub-conductor flat wire while keeping the overall resistance unchanged, thereby reducing the skin effect, improving motor efficiency, and reducing copper loss. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a flat wire hair clip composed of multiple parallel connections disclosed in an embodiment of the present utility model, showing the positions of the varnish removal part and the insulation part;

[0021] Figure 2 This is a schematic diagram of the structure of a flat wire hair clip composed of multiple parallel connections disclosed in an embodiment of the present utility model, showing the position and thickness of the inner insulating varnish film and the outer insulating varnish film.

[0022] In the picture:

[0023] 100. Sub-conductor flat wire; 110. Removed varnish section; 120. Insulating section; 121. Inner insulating varnish film;

[0024] 200. Integral flat wire winding; 210. Outer insulating varnish film. Detailed Implementation

[0025] To make the technical solutions and effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0026] The present invention aims to provide a flat wire winding to solve the problem of obvious skin effect in current flat wire windings due to their large cross-sectional area.

[0027] This embodiment divides the traditional single-strand flat wire structure into multiple layers based on their cross-sectional area, thereby reducing the cross-sectional area of ​​a single flat wire. This retains the advantage of high slot fill factor of flat wire while also taking into account the small cross-sectional area of ​​a single round wire conductor in traditional multi-strand round wire designs, effectively reducing the skin effect of the flat wire conductor and thus improving motor efficiency. The following is a detailed description of this solution:

[0028] The flat wire winding provided by this utility model includes at least two sub-conductor flat wires 100, which are formed by dividing the cross-sectional area of ​​a conventional single flat wire winding equally. The sub-conductor flat wires 100 are connected in parallel to form an integral flat wire winding 200.

[0029] To further explain, the sum of the cross-sectional areas of the multiple sub-conductor flat wires 100 is equivalent to the cross-sectional area of ​​a conventional single flat wire winding.

[0030] To further explain, the cross-sectional area of ​​the single sub-conductor flat wire 100 is 1 / n of the cross-sectional area of ​​a conventional single flat wire winding, where n is an integer greater than or equal to 2.

[0031] To explain further, the purpose of this design is to reduce the cross-sectional area of ​​a single sub-conductor flat wire while keeping the overall resistance constant. This helps to reduce the skin effect, thereby improving motor efficiency and reducing copper losses.

[0032] It should be noted that all sub-conductor flat wires 100 are made of the same material and have the same dimensions to ensure the uniformity and consistency of the overall structure. Preferably, the sub-conductor flat wires 100 are made of high-purity oxygen-free copper.

[0033] Please see Figure 1 In this embodiment, the cross-sectional area of ​​a conventional single flat wire winding is divided into three sub-conductor flat wires 100.

[0034] In a further embodiment, the sub-conductor flat wire 100 includes a devarnished portion 110 and an insulating portion 120. The devarnished portion 110 is located at the free end of the sub-conductor flat wire 100 and is not covered with insulating varnish to form a parallel conduction point of the sub-conductor flat wire 100. The insulating portion 120 is covered with a thin inner insulating varnish film 121, which is used to provide simple insulation for the structure of the parallel sub-conductor flat wires 100 except for the parallel conduction at the varnished portion 110.

[0035] Preferably, the thickness of the inner insulating varnish film 121 is in the range of 0.03-0.05 mm.

[0036] For further options, please refer to [link / reference]. Figure 2The contact surface between the integral flat wire winding 200 and the external conductor is covered with an outer insulating varnish film 210 of standard thickness to strictly insulate it from the conductors other than the flat wire conductor.

[0037] Generally, the thickness of the outer insulating varnish film 210 ranges from 0.08 to 0.12 mm.

[0038] A further proposed design is to have an aspect ratio of 0.2-0.5 for the overall flat wire winding 200.

[0039] A further option is to have the overall flat wire winding 200 in the form of a hairpin or an I-pin.

[0040] In a further embodiment, the flat wire winding provided by this utility model can be applied to various types of motors, including but not limited to new energy vehicle drive motors and industrial automation equipment motors.

[0041] The flat wire winding provided by this utility model retains the advantage of high slot fill factor of flat conductor wire, while taking into account the small cross-sectional area of ​​a single conductor in the traditional multi-strand round wire scheme, thus greatly improving the efficiency of the motor.

[0042] It should be noted that motor windings with the flat wire winding form provided by this utility model are also within the protection scope of this utility model.

[0043] Similarly, motors with flat wire windings provided by this utility model installed in the stator slots also fall within the protection scope of this utility model.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flat wire winding, characterized in that, It includes at least two sub-conductor flat wires (100) formed by dividing the cross-sectional area of ​​a conventional single flat wire winding equally, wherein the sub-conductor flat wires (100) are connected in parallel to form an integral flat wire winding (200), wherein: The sub-conductor flat wire (100) includes a varnish-removed portion (110) and an insulating portion (120). The varnish-removed portion (110) is located at the free end of the sub-conductor flat wire (100) and is not covered with insulating varnish to form a parallel conduction point of the sub-conductor flat wire (100). The surface of the insulating portion (120) is covered with an inner insulating varnish film (121). The contact surface between the integral flat wire winding (200) and the external conductor is covered with an outer insulating varnish film (210).

2. The flat wire winding according to claim 1, characterized in that, The thickness of the inner insulating varnish film (121) ranges from 0.03 to 0.05 mm.

3. The flat wire winding according to claim 1, characterized in that, The thickness of the outer insulating varnish film (210) ranges from 0.08 to 0.12 mm.

4. The flat wire winding according to claim 1, characterized in that, The aspect ratio of the integral flat wire winding (200) is 0.2-0.

5.

5. The flat wire winding according to claim 1 or 4, characterized in that, The integral flat wire winding (200) is in the form of a hairpin or an I-pin.

6. The flat wire winding according to claim 1, characterized in that, All the sub-conductor flat wires (100) are made of the same material and have the same dimensions.

7. An electric motor having stator slots, characterized in that, The stator slot is provided with a flat wire winding as described in any one of claims 1-6.

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