Hairpin type flat wire motor
By designing a hairpin coil with a round flat cross-section and a U-shaped curved shape, as well as a specific winding coil contact surface and arrangement order, the power and loss problems caused by different length and width ratios of the conductors in a flat wire motor are solved, and a lower discharge probability and higher service life are achieved.
Patent Information
- Application Number
- CN202421476056.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-26
AI Technical Summary
In flat wire motors, different length and width ratios of the conductors lead to different power magnitude and loss, and the arrangement between the conductors affects the discharge probability, resulting in service life and loss problems.
A hairpin-type flat wire motor is designed. The cross-sectional shape of the hairpin-type coil is round and flat, consisting of a rectangle and two semicircles. The length-to-width ratio of the rectangle is 2:1 and the total aspect ratio is 1.5:1. The zipper coil is shaped into a U-shaped bend. The contact surface of each layer of the conductor of the winding coil inside the stator core is the width of the rectangle, and the contact surface is half of the width of the rectangle in the cross-section of the zipper coil, and the arrangement order is half of the contact surface of the first layer and the second layer, half of the contact surface of the second layer and the third layer, and half of the contact surface of the third layer and the fourth layer.
By changing the wire cross-sectional structure of the card issuer coil, the coil contact surface of each layer of the winding coil is reduced, the discharge probability between the conductors is reduced, the service life is improved, the loss of skin effect and proximity effect is reduced, and the power density of the copper wire is increased.
Smart Images
Figure CN222750221U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a hairpin-type flat wire motor. Background Art
[0002] The drive motors used in new energy vehicles generally include flat wire motors and round wire motors. Compared with round wire motors, flat wire motors have higher slot fill rate and power density, making them widely used in the field of automotive drive motors.
[0003] Different length-to-width ratios of the winding wires in flat wire motors will result in different power sizes and losses. The arrangement of the wires will also produce different discharge probabilities and result in different losses.
[0004] In view of the above problems, a hairpin type flat wire motor is proposed. Utility Model Content
[0005] The utility model aims to provide a hairpin type flat wire motor, which can reduce the probability of discharge between conductors and increase the service life.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] A hairpin-type flat wire motor comprises a stator core and a hairpin coil, wherein the cross-section of the hairpin coil is oval, and the oval cross-section is composed of a rectangle and two semicircles of the same size, the diameters of the two semicircles and the two long sides of the rectangle are the same side, the aspect ratio of the rectangle is 2:1, and the total aspect ratio of the oval cross-section is 1.5:1.
[0008] As a further description of the above technical solution: the hairpin coil is shaped like a U-bend, and the U-bends are all bent 0-180 degrees on the rectangular surface of the conductor.
[0009] As a further description of the above technical solution: the stator core has a winding coil inside, and the contact surface of each layer of conductor is the width of the rectangle in the conductor cross section, and the contact surface is half the width of the rectangle in the hairpin coil cross section. The arrangement order is half of the contact surface between the first layer and the second layer of the coil group, half of the contact surface between the second layer and the third layer, and half of the contact surface between the third layer and the fourth layer.
[0010] As a further description of the above technical solution: evenly distributed stator slots are provided inside the stator core.
[0011] As a further description of the above technical solution: the stator slots are slanted in shape according to the arrangement sequence of the winding coils in layers one, two, three and four, and the shape of the stator slots is a parallelogram.
[0012] As a further description of the above technical solution: an insulating bushing is fixedly connected to the inner wall of the stator core, and the gap between the winding coil and the stator slot forms a cooling channel.
[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0014] The utility model provides a hairpin type flat wire motor, which firstly reduces the coil contact area of each layer of the winding coil by changing the conductor cross-section structure of the hairpin coil, reduces the discharge probability between conductors, increases the service life, reduces the loss of skin effect and proximity effect, and the length-to-width ratio design of the copper wire brings higher power. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the core structure in the first embodiment of the utility model;
[0016] Figure 2 This is a schematic diagram of the core structure in the second embodiment of the present utility model;
[0017] Figure 3 It is a structural schematic diagram of a single hairpin winding coil of the utility model;
[0018] Figure 4 It is a schematic cross-sectional structure diagram of a multi-layer winding coil arrangement according to the first embodiment of the utility model;
[0019] Figure 5 It is a schematic cross-sectional structure diagram of a multi-layer winding coil arrangement according to the second embodiment of the present utility model;
[0020] Figure 6 It is a schematic diagram of the cross section of the hairpin winding coil conductor of the utility model.
[0021] In the figure: 1, stator core; 11, stator slot; 12, cooling channel; 2, hairpin coil; 21, winding coil; 211, length of rectangle; 212, width of rectangle; 213, arc radius; 4, insulating bushing. DETAILED DESCRIPTION
[0022] The following will refer to the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] In order to further understand the content of the utility model, the utility model is described in detail with reference to the accompanying drawings.
[0024] Embodiment 1
[0025] Reference Figure 1 , Figure 3 , Figure 4 and Figure 6 The utility model discloses a hairpin-type flat wire motor, comprising a stator core 1 and a hairpin coil 2. The stator core 1 includes two directions, clockwise and counterclockwise, according to the winding arrangement sequence. Each stator slot 11 is arranged in the same direction. Each stator core 1 has a plurality of stator slots 11, and the plurality of stator slots 11 are arranged at intervals along the circumference of the stator core 1. Each stator slot 11 has a multi-layer winding coil 21, a cooling channel 12, and an insulating bushing 4.
[0026] In this embodiment, the stator core 1 has a winding coil inside, and the contact surface of each layer of the conductor is the width 212 of the rectangle in the conductor cross section, and the contact surface is half the width of the rectangle in the cross section of the hairpin coil 2. The arrangement order is that the first layer of the coil group contacts half of the second layer, the second layer contacts half of the third layer, and the third layer contacts half of the fourth layer. Figure 2 The cross-section of the hairpin coil 2 is oval, and the oval cross-section consists of a rectangle and two semicircles of the same size, and the arc radius of the two semicircles is 213. Figure 6 As shown, the diameter of the two semicircles and the two long sides of the rectangle are the same side, that is, the length 211 of the rectangle, and the aspect ratio of the rectangle is 2:1. The total aspect ratio of the round flat cross section formed by them is 1.5:1, that is: the width 212 of the rectangle + 2 arc radii 213: the length 211 of the rectangle is 1.5:1. The contact surface of each layer of the conductor of the hairpin winding coil is the width 212 of the rectangle in the conductor cross section, and the contact surface is half of the width of the rectangle in the cross section, that is, half of the length of the width 212 of the rectangle. The arrangement order is half of the contact surface between the first layer and the second layer of the coil group, half of the contact surface between the second layer and the third layer, and half of the contact surface between the third layer and the fourth layer, and the arrangement order is in the same direction; and so on, the arrangement of more layers of winding coils remains the same.
[0027] In this embodiment, the stator core 1 is provided with evenly distributed stator slots 11. The stator slots 11 are formed in an oblique shape according to the arrangement order of the winding coils in the first, second, third and fourth layers. The shape of the stator slots 11 is a parallelogram. An insulating bushing 4 is fixedly connected to the inner wall of the stator core 1. The gap between the winding coil 21 and the stator slots 11 forms a cooling channel 12. The cooling channel 12 is an oil-cooled channel. The coolant is in direct contact with the winding coil, and the cooling effect is good.
[0028] In this embodiment, the hairpin coil 2 is shaped like a U-bend, and the U-bends are all bent 0-180 degrees on the rectangular surface of the conductor.
[0029] Embodiment 2
[0030] Reference Figure 2 and Figure 5 , which differs from Embodiment 1 mainly in that the stator core 1 is rectangular and the arrangement of the winding coils 21 is different.
[0031] In this embodiment, each layer of hairpin winding coils is arranged as follows: the first layer of the winding coil is close to the left side of the stator slot wall; the second layer of the winding coil is close to the right side of the stator slot 11, and the contact surface between the second layer of winding and the first layer of winding is half of the width 212 of the rectangle; the third layer and the first layer of winding are close to the stator slot 11 in the same direction, and the contact surface between the third layer and the second layer of winding is half of the width 212 of the rectangle; the fourth layer and the second layer of winding are close to the stator slot 11 in the same direction, and the contact surface between the fourth layer and the third layer of winding is half of the width 212 of the rectangle; the gap between the winding coil 21 and the stator slot 11 is still used as a cooling channel 12.
[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A hairpin flat wire motor, comprising a stator core (1) and a hairpin coil (2), characterized in that: The cross-sectional shape of the hairpin coil (2) is oval, and the oval cross-sectional shape is composed of a rectangle and two semicircles of the same size, the diameters of the two semicircles and the two long sides of the rectangle are the same side, the aspect ratio of the rectangle is 2:1, and the overall aspect ratio of the oval cross-sectional shape composed of the two semicircles is 1.5:
1.
2. The hairpin flat wire motor according to claim 1, characterized in that: The hairpin coil (2) is in the shape of a U-bend, and the U-bends are all bent 0-180 degrees on the rectangular surface of the conductor.
3. The hairpin flat wire motor according to claim 1, characterized in that: The stator core (1) has a winding coil inside, and the contact surface of each layer of conductor is the width of the rectangle in the conductor cross section, and the contact surface is half the width of the rectangle in the cross section of the hairpin coil (2). The arrangement order is that the first layer of the coil group contacts half of the second layer, the second layer contacts half of the third layer, and the third layer contacts half of the fourth layer.
4. The hairpin flat wire motor according to claim 1, characterized in that: The stator core (1) is provided with evenly distributed stator slots (11) inside.
5. The hairpin flat wire motor according to claim 4, characterized in that: The stator slot (11) is formed into an oblique shape according to the arrangement sequence of the winding coils in layers one, two, three and four, and the shape of the stator slot (11) is a parallelogram.
6. The hairpin flat wire motor according to claim 5, characterized in that: An insulating bushing (4) is fixedly connected to the inner wall of the stator core (1), and a gap between the winding coil (21) and the stator slot (11) forms a cooling channel (12).