Stator and motor

Abstract

The invention relates to a stator (1) comprising a stator core (2) and a winding (3), the stator core (2) having a slot (24) into which a conductor (31) of the winding (3) is inserted, the conductor (31) having a recess (32), the conductor (31) being surrounded by an insulation (33), a cooling channel being formed between the recess (32) and the insulation (33) for guiding a flow of a cooling medium. The invention further relates to an electric machine having such a stator.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, in particular to the technical field of cooling of motors, and more specifically to a motor with a slot cooling structure. Background Art

[0002] The motor in the prior art usually has a cooling jacket on the outer surface of the stator core of the motor, through which the heat is transferred to the cooling water flowing along the cooling jacket. The heat of the stator must be transferred to the cooling jacket, and then to the cooling water, which flows along the ribs of the cooling jacket, and the ribs always surround the outer surface of the cooling jacket. This design increases the radial space of the motor, and because the stator wire is not directly cooled, the cooling effect is often not ideal.

[0003] In addition, another motor with a similar cooling structure is known from patent document CN209448600U. The stator part of the motor includes a stator core, and a plurality of stator tooth slots are evenly distributed along the circumferential direction on one side of the inner wall of the stator core. An inner winding is inserted into the slot, and the ends of the inner winding are connected by welding in a certain order to form a stator end winding. The stator slot inner winding and the stator end winding are both in the form of flat wires, and their cross-sections are rectangular. The cooling structure includes an in-slot cooling oil circuit, and the in-slot cooling oil circuit includes an oil inlet and an oil outlet, so that the cooling oil enters the motor from the oil inlet, flows through the in-slot cooling oil circuit, and flows out of the motor through the oil outlet. The cooling channel occupies the radial space of the slot, making the slot long and narrow, increasing the slot leakage resistance, and causing a serious skin effect.

[0004] Patent document DE102020107165 discloses another motor with a similar cooling structure, which also belongs to slot cooling. The coolant channel is located in the stator core, and the cooling channel is formed on the width of the stator core tooth portion, and the cross section of the wire is always kept rectangular. Although this design saves radial space, it requires the tooth portion to have a special structural design, which increases the manufacturing cost. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to provide an improved stator with a slot-type cooling structure, which not only has a smaller radial space and is easy to process, but also has a better cooling effect without increasing the manufacturing cost.

[0006] The technical problem is solved by a stator designed according to the present invention. The stator includes a stator core and a winding, the stator core has a slot portion, the wire of the winding is inserted into the slot portion, wherein the wire has a recessed portion, the wire is surrounded by an insulating member, wherein a cooling channel for guiding the flow of a cooling medium is formed between the recessed portion and the insulating member. The cooling channel is composed of the recessed portion and the insulating member, and the cooling medium flowing along the cooling channel directly cools the wire and the stator core, resulting in a better cooling effect. Since no separate cooling channel is provided in the slot, the radial space of the stator core is saved. In addition, since the cooling channel according to the present invention utilizes the space between the wire and the insulating member, there is no need to perform special structural design on the slot portion of the stator core, which makes manufacturing easier and reduces manufacturing costs.

[0007] According to a preferred embodiment of the present invention, the stator core has a plurality of laminates, each laminate has a plurality of teeth, and the slot is arranged between two teeth. The slot designed according to the present invention does not require a special structural design, and the slot in the prior art can be used, which saves manufacturing costs. In addition, preferably, the recess is arranged at the outer peripheral edge of the wire, that is, the recess is arranged at the corner of the wire, which can simplify the structure of the wire and reduce the difficulty of processing the wire. In addition, it can be considered that the recess is designed to be rectangular, triangular or arc-shaped, which is more conducive to the processing of the wire. The wire is formed by a drawing process, such as a round wire, and the hole of the mold is round. The special-shaped wire with a recess can also be drawn out by a mold of a specific shape. In addition, the recess can also be formed by rolling the wire later. The manufacturing cost of these two methods is very low and the process is relatively simple, which can reduce the manufacturing cost of the stator. It can also be considered that a plurality of recesses are evenly arranged on the outer periphery of the wire to form a plurality of cooling channels, which can enhance the cooling effect.

[0008] According to a preferred embodiment of the present invention, a plurality of wires are inserted into each slot, and adjacent wires are separated by insulating members to form respective cooling channels in each wire. Each rectangular segment has its own cooling channel, the purpose of which is to share a copper wire and enhance the cooling effect. Preferably, no additional sealing treatment is required between the wires, and the wires, insulating members, and stator cores can be bonded together using a paint dripping process. Even if there is a little gap between the insulating members and the wires, it does not matter, because the gap resistance is large, and most of the fluid still flows along the wire recesses, thereby forming a cooling channel for cooling the stator. It is also conceivable to use insulating paper as an insulating member. Insulating paper has good insulating properties and good mechanical properties, and is lightweight and easier to process.

[0009] In addition, the above technical problem can also be solved by a motor. The motor includes a stator having the above characteristics. The motor is especially a motor with a slot cooling structure, which includes a stator core, insulating paper and a conductor thereof, and a cooling channel for guiding the flow of a cooling medium is formed between the insulating paper and the conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The features, advantages and technical effects of one embodiment of the present invention will be described below with reference to the accompanying drawings.

[0011] Figure 1 A stator core with a cooling jacket according to the prior art is shown;

[0012] Figure 2 Showing a stator core designed according to the present invention;

[0013] Figure 3 A detailed view showing the laminate of a stator core designed according to the present invention;

[0014] Figure 4 A detailed view of a stator core designed according to a first embodiment of the present invention is shown;

[0015] Figure 5 A detailed view showing a stator core designed according to a second embodiment of the present invention;

[0016] Figure 6 A detailed view of a stator core designed according to a third embodiment of the present invention is shown. DETAILED DESCRIPTION

[0017] Figure 1 A stator core 10 using a cooling jacket in the prior art is shown. A cooling jacket 11 is provided on the outer surface of the stator core 10 in close contact, and ribs 12 for guiding the flow of cooling water are provided on the outer surface of the cooling jacket 11. The cooling jacket can transfer the heat of the stator core 10 to the cooling water flowing along the cooling jacket.

[0018] Figure 2 A slot-type stator 1 designed according to the present invention is shown. The slot-type stator 1 has a stator core 2 and a winding 3 . Figure 3 A further detailed view of the stator core 2 is shown, which includes a plurality of, in particular, hundreds of laminates 21, each of which has a thickness of 0.25 mm to 0.5 mm. The laminate 21 has a plurality of teeth 23, and slots 24 are provided between the teeth 23. In addition, a yoke 22 is provided on the radial outer periphery of the laminate 21. The winding 3 is inserted into the slot 24.

[0019] Compared with common winding designs, the slot-cooled motor structure according to the present invention shows a special wire structure and cooling channels. Figure 4-6 Details of the stator core and its windings are shown. Figure 4The first embodiment is shown, and the wire 31 is inserted into the slot 24, and there are 4 wires 31 in each slot. The wire 31 has a substantially rectangular cross-section, and each wire 31 has a recess 32. The wire 31 is surrounded by an insulating paper 33, and the insulating paper 33 is used to separate the wire 31 from the slot 24 of the stator core 2, and to separate different wires 31. Therefore, the insulating paper 33 and the recess 32 form a cooling channel that can guide the circulation of the cooling medium. The cooling medium can flow along the channel between the recess 32 and the insulating paper 33, so that both the wire 31 and the stator core 2 can be directly cooled.

[0020] Figure 5 and Figure 6 Other embodiments of the wire 31 designed according to the present invention are shown. The wire 31 can have different shapes according to actual needs to form cooling channels of different shapes. The wire 31 can be formed, for example, by a drawing process, and can be drawn out by a mold of a specific shape. In addition, the wire 31 can also be formed by rolling forming.

[0021] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention. In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] Reference numerals list

[0023] 1 Stator

[0024] 2 Stator core

[0025] 3 Winding

[0026] 10. Stator core of prior art

[0027] 11 Cooling Jacket

[0028] 12 Ribs

[0029] 21 Laminate

[0030] 22 Yoke

[0031] 23 teeth

[0032] 24 Groove

[0033] 31 Wire

[0034] 32 recess

[0035] 33 Insulation Paper

Claims

1. A stator (1), comprising a stator core (2) and a winding (3), wherein the stator core (2) has a slot (24), a conductor (31) of the winding (3) is inserted into the slot (24), wherein: The conductor (31) has a recess (32), and the conductor (31) is surrounded by an insulating member (33), wherein a cooling channel for guiding the flow of a cooling medium is formed between the recess (32) and the insulating member (33).

2. The stator (1) according to claim 1, characterized in that The stator core (2) has a plurality of laminated plates (21), each of the laminated plates (21) has a plurality of tooth portions (23), and the slot portion (24) is provided between two tooth portions (23).

3. The stator (1) according to claim 1, characterized in that The recess (32) is provided at the outer peripheral edge of the conductive wire.

4. The stator (1) according to any one of claims 1 to 3, characterized in that The recess (32) can have a rectangular, triangular or arcuate shape in cross section.

5. The stator (1) according to any one of claims 1 to 3, characterized in that The conductive wire (31) forms the recess (32) through a drawing process or a rolling process.

6. The stator (1) according to any one of claims 1 to 3, characterized in that A plurality of the recesses (32) are evenly arranged on the outer circumference of the conductive wire (31).

7. The stator (1) according to claim 1, characterized in that A plurality of the conductive wires (31) are inserted into each of the grooves (24), and adjacent conductive wires (31) are spaced apart by the insulating member (33) so as to form a respective cooling channel in each conductive wire (31).

8. The stator (1) according to claim 7, characterized in that The conductor (31) and the insulating member (33) are bonded together by a paint dripping process.

9. The stator (1) according to claim 1, characterized in that The insulating member (33) is insulating paper.

10. A motor, characterized in that: The electric machine comprises a stator (1) according to any one of claims 1 to 9.

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