Stator core of a two-in-one motor, two-in-one motor

Abstract

The application provides a stator core of a two-in-one motor and a two-in-one motor. The stator core of the two-in-one motor comprises an inner stator core, an outer stator core, a positioning pin, a shell and a bolt. The outer stator core is coaxially arranged at the radially outer side of the inner stator core, and the opposite sides of the inner stator core and the outer stator core are respectively provided with arc-shaped grooves extending in the axial direction. The positioning pin is arranged in the arc-shaped grooves and can limit the radial and circumferential relative positions of the inner stator core and the outer stator core, and the positioning pin is formed in a cylindrical shape. The bolt passes through the positioning pin in the axial direction and fixes the inner stator core and the outer stator core to the shell, and the head of the bolt or a nut connected with the bolt in the threaded connection presses the inner stator core and the outer stator core against the shell in the axial direction.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to the stator core of a two-in-one motor and the two-in-one motor itself. Background Technology

[0002] In the pure electric / hybrid vehicle market, technological advancements are occurring rapidly. As a core component of the dedicated hybrid transmission (DHT) and the electric axle, motor technology is also iterating quickly. Two-in-one motor stators will become the future trend. However, due to magnetic field cross-interference caused by integrating two motors, its efficiency still needs optimization.

[0003] CN118713327A discloses a stator core structure for a two-in-one motor. It includes the following issues:

[0004] (1) The magnetic isolation ring (magnetic bridge) adopts a dovetail groove structure, which is complex and makes manufacturing and assembly difficult;

[0005] (2) The original material of the stator core in the shape of a dovetail groove needs to be removed, which leads to a decrease in electromagnetic efficiency;

[0006] (3) The number of structural components is large and complex, resulting in high processing costs. Utility Model Content

[0007] In order to solve or alleviate at least one of the technical problems mentioned in the background art, this application provides a stator core of a two-in-one motor and a two-in-one motor.

[0008] The stator core of the two-in-one motor provided in this application includes: an inner stator core and an outer stator core, wherein the outer stator core is coaxially disposed on the radially outer side of the inner stator core, and the inner stator core and the outer stator core are respectively provided with axially extending arc-shaped grooves on their radially opposite sides; a plurality of positioning pins, wherein the positioning pins are disposed in the arc-shaped grooves and can limit the radial and circumferential relative positions of the inner stator core and the outer stator core, and the positioning pins are formed into hollow cylindrical shapes; a housing and bolts, wherein the bolts pass through the positioning pins along the axial direction and fix the inner stator core and the outer stator core to the housing, and the head of the bolt or the nut threadedly connected to the bolt presses the inner stator core and the outer stator core against the housing in the axial direction.

[0009] In at least one embodiment, a magnetic isolation ring with a magnetic shielding effect is provided radially between the inner stator core and the outer stator core.

[0010] In at least one embodiment, the magnetic isolation ring includes a plurality of arc segments that are broken in the circumferential direction, and in the axial direction, the arc segments are pressed against the housing by the head of the bolt or the nut.

[0011] In at least one embodiment, the plurality of positioning pins are arranged in a circumferential array around the axis of the two-in-one motor, and the plurality of arc segments have the same structure.

[0012] In at least one embodiment, there is a circumferential gap between two adjacent locating pins, and the gap is between the radial outer surface of the inner stator core and the radial inner surface of the outer stator core, through which air or liquid can flow.

[0013] In at least one embodiment, the locating pin is interference-fitted or transition-fitted with the arcuate groove.

[0014] In at least one embodiment, the arc segment is formed in a wavy or sawtooth shape, and there are gaps between the arc segment and the inner stator core and the outer stator core for cooling oil to flow through.

[0015] In at least one embodiment, the axial length of the locating pin is greater than the axial length of the arcuate groove.

[0016] The two-in-one motor provided in this application includes the stator core of the two-in-one motor as described above.

[0017] In at least one embodiment, the two-in-one motor further includes: an inner rotor disposed radially inside the inner stator core; and an outer rotor disposed radially outside the outer stator core.

[0018] The stator core of this two-in-one motor is positioned radially by a cylindrical locating pin and an arc-shaped groove, and then axially fixed with bolts, achieving rapid and precise positioning and installation of the two stator cores. Compared to machining dovetail grooves on the stator core, this application only requires machining arc-shaped grooves, reducing the cross-sectional area loss of the core, improving electromagnetic performance, and reducing processing costs. Attached Figure Description

[0019] Figure 1 A cross-sectional view of the stator core of a two-in-one motor according to an embodiment of this application is shown.

[0020] Figure 2 It shows Figure 1 The image shows a partial enlarged view of the stator core of the two-in-one motor, with the bolts hidden.

[0021] Figure 3 A front view of the stator core of a two-in-one motor according to an embodiment of this application is shown.

[0022] Figure 4 It shows Figure 3 The image shows a partial enlarged view of the stator core of the two-in-one motor, with the bolts hidden.

[0023] Figure 5 A cross-sectional view of the locating pin of the stator core of a two-in-one motor according to an embodiment of this application is shown.

[0024] Figure 6 A cross-sectional view of an arc segment of the magnetic isolation ring of the stator core of a two-in-one motor according to an embodiment of this application is shown.

[0025] Explanation of reference numerals in the attached figures

[0026] 101 Inner Stator Core

[0027] 102 Outer Stator Core

[0028] 103 Arc-shaped groove

[0029] 200 positioning pins

[0030] 300 housing

[0031] 301 threaded hole

[0032] 400 bolts

[0033] 401 Head

[0034] 500 magnetic isolation ring

[0035] 501 arc segment

[0036] 601 Internal Rotor

[0037] 602 External Rotor

[0038] 603 axis Detailed Implementation

[0039] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0040] This application provides the stator core of the two-in-one motor and the two-in-one motor.

[0041] See Figure 1 The stator core of the two-in-one motor may include an inner stator core 101, an outer stator core 102, a positioning pin 200, a housing 300, and bolts 400.

[0042] See Figure 4 The outer stator core 102 can be disposed on the radially outer side of the inner stator core 101, and the inner stator core 101 and the outer stator core 102 are respectively provided with arc-shaped grooves 103 extending along the axial direction on the radially opposite sides.

[0043] The locating pin 200 can be disposed in the arc-shaped groove 103 and can limit the radial and circumferential relative positions of the inner stator core 101 and the outer stator core 102. Further, the stator core of the two-in-one motor can include multiple locating pins 200 and multiple arc-shaped grooves 103. The fit between the locating pin 200 and the arc-shaped groove 103 can be set as an interference fit or a transition fit. Of course, in the case of multiple locating pins 200, some locating pins 200 can be interference-fitted with some arc-shaped grooves 103, while other locating pins 200 can be transition-fitted with other arc-shaped grooves 103. The locating pin 200 helps to keep the inner stator core 101 and the outer stator core 102 relatively fixed before the mounting bolt 400. The material of the locating pin 200 can be stainless steel, aluminum, or other materials with magnetic shielding effects.

[0044] See Figure 1 , Figure 5 The housing 300 is provided with a threaded hole 301. The locating pin 200 can be formed into a hollow cylindrical shape. The bolt 400 can pass through the locating pin 200 axially and be fixed in the threaded hole 301. The head 401 of the bolt 400 presses the inner stator core 101 and the outer stator core 102 against the housing 300 axially. Of course, a nut can also be provided on the bolt 400 and threadedly connected thereto, so as to press the inner stator core 101 and the outer stator core 102 against the housing 300. Exemplarily, a washer can also be provided between the nut and the stator core.

[0045] The stator core of this two-in-one motor is positioned radially by a cylindrical locating pin and an arc-shaped groove, and then axially fixed with bolts, achieving rapid and precise positioning and installation of the two stator cores. Compared to machining dovetail grooves on the stator core, this application only requires machining arc-shaped grooves, reducing the cross-sectional area loss of the core, improving electromagnetic performance, and reducing processing costs.

[0046] In one implementation, see Figure 4 , Figure 6 A magnetic isolation ring 500 may also be provided radially between the inner stator core 101 and the outer stator core 102. The magnetic isolation ring 500 is made of a material with magnetic shielding effect to reduce mutual interference between the internal and external magnetic fields. For example, the material of the magnetic isolation ring 500 may be stainless steel, aluminum, etc.

[0047] In one implementation, see Figure 3 The magnetic isolation ring 500 includes multiple arc segments 501 that are broken in the circumferential direction by the locating pin 200. In the axial direction, the arc segments 501 are pressed against the housing 300 by the head 401 of the bolt 400 or the nut.

[0048] Exemplarily, adjacent arc segments 501 have gaps between themselves and the inner stator core 101 and / or the outer stator core 102. Adjacent arc segments 501 may also have gaps between themselves and the locating pins 200. In one example, the arc segment 501 may be wavy or serrated, thus creating gaps between the arc segment 501 and both the inner stator core 101 and the outer stator core 102, which can be used for the flow of cooling oil.

[0049] In one implementation, see Figure 3 Multiple positioning pins 200 are arranged in a circular array around the axis of the two-in-one motor, that is, the interval between two positioning pins 200 is the same, so that the multiple arc segments 501 have the same structure, which facilitates manufacturing and assembly.

[0050] In one embodiment, the magnetic isolation ring 500 may be omitted, allowing a gap between the radial outer surface of the inner stator core 101 and the radial inner surface of the outer stator core 102, as well as a circumferential gap between adjacent positioning pins 200. This allows air or liquid to flow through the gap, thereby isolating the magnetic field by air or by liquid. Furthermore, allowing air or liquid to flow through the gap also improves the overall heat dissipation.

[0051] In one implementation, see Figure 2 The axial lengths of the inner stator core 101 and the outer stator core 102 can be the same. Furthermore, the axial length of the locating pin 200 can be greater than the axial length of the arc-shaped groove 103.

[0052] The two-in-one motor provided in this application may include the stator core of the aforementioned two-in-one motor.

[0053] In one implementation, see Figure 1 The two-in-one motor may also include an inner rotor 601, an outer rotor 602, and a shaft 603.

[0054] The inner rotor 601 is located radially inside the inner stator core 101, and the outer rotor 602 is located radially outside the outer stator core 102. The shaft 603 is fixed to the inner rotor 601.

[0055] For example, the installation sequence can be as follows: first, the inner stator core 101 and the outer stator core 102 are fixed relative to each other by means of positioning pin 200; then, the magnetic isolation ring 500 is inserted, and the inner stator core 101, the outer stator core 102 and the magnetic isolation ring 500 are fixed to the housing 300 by means of bolt 400; finally, the outer rotor 602, the inner rotor 601 and the shaft 603 are installed respectively.

[0056] The above description is the preferred embodiment of this application. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A stator core for a two-in-one motor, characterized in that, include: The inner stator core and the outer stator core are coaxially disposed on the radially outer side of the inner stator core. The inner stator core and the outer stator core are respectively provided with axially extending arc-shaped grooves on their radially opposite sides. Multiple positioning pins are provided in the arc-shaped groove and can limit the radial and circumferential relative positions of the inner stator core and the outer stator core. The positioning pins are formed in the shape of hollow cylinders. The housing and bolts are provided. The bolts pass through the locating pins along the axial direction and fix the inner stator core and the outer stator core to the housing. The head of the bolt or the nut threaded to the bolt presses the inner stator core and the outer stator core against the housing along the axial direction.

2. The stator core of the two-in-one motor according to claim 1, characterized in that, A magnetic isolation ring with a magnetic shielding effect is provided radially between the inner stator core and the outer stator core.

3. The stator core of the two-in-one motor according to claim 2, characterized in that, The magnetic isolation ring includes multiple arc segments that are broken in the circumferential direction, and in the axial direction, the arc segments are pressed against the housing by the head of the bolt or the nut.

4. The stator core of the two-in-one motor according to claim 3, characterized in that, The plurality of positioning pins are arranged in a circular array around the axis of the two-in-one motor, and the plurality of arc segments have the same structure.

5. The stator core of the two-in-one motor according to claim 1, characterized in that, There is a circumferential gap between two adjacent positioning pins, and the gap is between the radial outer surface of the inner stator core and the radial inner surface of the outer stator core, through which air or liquid can flow.

6. The stator core of the two-in-one motor according to claim 1, characterized in that, The locating pin is either interference-fitted or transition-fitted with the arc-shaped groove.

7. The stator core of the two-in-one motor according to claim 3, characterized in that, The arc segment is formed in a wavy or sawtooth shape, and there are gaps between the arc segment and the inner stator core and the outer stator core to allow cooling oil to flow.

8. The stator core of the two-in-one motor according to claim 7, characterized in that, The axial length of the locating pin is greater than the axial length of the arc-shaped groove.

9. A two-in-one motor, characterized in that, The stator core of the two-in-one motor as described in any one of claims 1 to 8.

10. The two-in-one motor according to claim 9, characterized in that, The two-in-one motor also includes: An inner rotor is disposed radially inside the inner stator core; The outer rotor is located radially outside the outer stator core.

Images