Stator and motor

Abstract

The utility model relates to the technical field of motors, in particular to a stator and a motor. The stator comprises a stator iron core and magnetic slot wedges, the stator iron core comprises a plurality of tooth parts, a plurality of open slots are formed in the stator iron core at intervals in the circumferential direction of the stator iron core, the open slots penetrate through the stator iron core in the radial direction of the stator iron core, one tooth part is clamped between every two adjacent open slots, and one magnetic slot wedge is clamped and fixed in each open slot. The magnetic slot wedges block the top openings of the corresponding open slots, and the length of the open slots is larger than that of the magnetic slot wedges in the radial direction of the stator iron core. According to the stator and the motor provided by the utility model, the magnetic slot wedges are prevented from extending out of the open slots along the radial direction of the stator iron core, the phenomenon of magnetic leakage is avoided, a magnetic circuit is optimized, the performance of the motor is improved, and the coil exposed out of the inner and outer diameter parts of the stator iron core is prevented from being covered and pressed by the magnetic slot wedges. And the oil cooling heat dissipation effect on the coil and the whole stator is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator and a motor. Background Art

[0002] Axial flux permanent magnet motor has the advantages of compact structure, high power density and high efficiency, and has become a hot spot in the motor industry. The stator in the motor is an important component of the motor magnetic circuit.

[0003] In the prior art, the stator usually includes a stator core and a magnetic slot wedge. The stator core is provided with a plurality of open slots spaced apart along its circumference. A tooth portion is provided between two adjacent open slots. The coil is wound on the tooth portion. After the winding of the coil is completed, the magnetic slot wedge is installed in the open slot to limit the position of the coil. However, the magnetic slot wedge usually extends out of the open slot along the radial direction of the stator core, resulting in magnetic leakage, which greatly reduces the performance of the motor. In addition, the stator is usually directly immersed in cooling oil for heat dissipation. The part of the coil that leaks out of the inner and outer diameters of the stator core is easily covered and pressed by the end of the magnetic slot wedge extending out of the open slot, which greatly reduces the contact area between the coil and the cooling oil, and reduces the heat dissipation effect of the coil and the entire stator.

[0004] Therefore, there is an urgent need for a stator and a motor to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a stator and a motor to avoid magnetic leakage, optimize the magnetic circuit, improve the performance of the motor, and also improve the oil cooling and heat dissipation effect of the coil and the entire stator.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A stator, comprising:

[0008] A stator core, the stator core comprising a plurality of teeth, the stator core being provided with a plurality of open slots spaced apart along its circumferential direction, the open slots penetrating the stator core along the radial direction of the stator core, and one of the teeth being sandwiched between two adjacent open slots; and

[0009] A magnetic slot wedge, each of the open slots is clamped and fixed with a magnetic slot wedge, and the magnetic slot wedge is sealed at the top opening of the corresponding open slot;

[0010] Along the radial direction of the stator core, the length of the open slot is greater than the length of the magnetic slot wedge.

[0011] As an optional solution, the magnetic slot wedge includes an insertion end and a positioning end, and the insertion end and the positioning end are respectively located at two ends of the magnetic slot wedge along the radial direction of the stator core. Along the radial direction of the stator core, the insertion end is located in the open slot, and the outer end surface of the positioning end is flush with the outer end surface of the tooth portion.

[0012] As an optional solution, the magnetic slot wedge also includes:

[0013] A magnetic conductive portion, the outer wall of the magnetic conductive portion is engaged with the inner wall of the opening slot and is magnetically connected; and

[0014] The non-magnetic conductive part includes a first limiting part, a main body and a second limiting part which are connected in sequence along the radial direction of the stator core, the magnetic conductive part is arranged on the main body, and the magnetic conductive part is located between the first limiting part and the second limiting part, the first limiting part is the insertion end, and the second limiting part is the positioning end.

[0015] As an optional solution, the first limiting portion and the second limiting portion are respectively in contact with two end surfaces of the magnetic conductive portion along the length direction thereof.

[0016] As an optional solution, a clamping groove is provided on the inner side wall of the opening slot, and a clamping protrusion is provided on the outer side wall of the magnetic conductive portion along the width direction of the magnetic slot wedge, and the clamping protrusion is clamped in the clamping groove.

[0017] As an optional solution, the magnetic slot wedge includes two magnetic conductive portions which are arranged at intervals along the width direction of the magnetic slot wedge.

[0018] As an optional solution, a positioning protrusion is provided on the outer side wall of the second limiting portion, and an abutment groove connected to the clamping groove is also provided on the inner side wall of the opening groove, and the positioning protrusion abuts against the abutment groove.

[0019] As an optional solution, the stator core further includes a yoke, the height of the tooth portion extends along the axial direction of the motor, the bottom of the tooth portion is connected to the yoke, and the top of the tooth portion is used to form an axial air gap with the rotor.

[0020] As an optional solution, the magnetic conductive part includes a plurality of magnetic conductive sheets stacked and fixed in sequence along the radial direction of the stator core, two adjacent magnetic conductive sheets are insulated from each other, and the outer wall of the magnetic conductive sheet is clamped and magnetically connected to the inner wall of the opening slot.

[0021] A motor comprises a rotor, and the motor also comprises a stator as described above, wherein the stator cooperates with the rotor.

[0022] Beneficial effects of the utility model:

[0023] The utility model provides a stator, which includes a stator core and a magnetic slot wedge, wherein the stator core includes a plurality of teeth, a plurality of open slots are arranged at intervals along the circumference of the stator core, the open slots penetrate the stator core along the radial direction of the stator core, a tooth is sandwiched between two adjacent open slots, a magnetic slot wedge is clamped and fixed in each open slot, the magnetic slot wedge is blocked at the top opening of the corresponding open slot, and the length of the open slot is greater than the length of the magnetic slot wedge along the radial direction of the stator core. The stator provided by the utility model, because the length of the open slot is greater than the length of the magnetic slot wedge, avoids the magnetic slot wedge extending out of the open slot in the radial direction of the stator core, thereby avoiding the phenomenon of magnetic leakage, optimizing the magnetic circuit, and improving the performance of the motor. In addition, because the magnetic slot wedge does not extend out of the open slot in the radial direction of the stator core, it is avoided that the coil leaking out of the inner and outer diameter parts of the stator core is covered and pressed by the magnetic slot wedge, thereby increasing the contact area between the coil and the cooling oil, and improving the oil cooling and heat dissipation effect of the coil and the entire stator.

[0024] The utility model also provides a motor, which, by applying the above-mentioned stator, avoids the phenomenon of magnetic leakage, optimizes the magnetic circuit, improves the performance of the motor, and also avoids the coils leaking out of the inner and outer diameter parts of the stator core from being covered and pressed by the magnetic slot wedges, thereby increasing the contact area between the coil and the cooling oil, and improving the oil cooling and heat dissipation effect of the coil and the entire stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a stator provided in an embodiment of the utility model;

[0026] Figure 2 yes Figure 1 A magnified view of the structure at center A;

[0027] Figure 3 It is a structural exploded diagram of a stator provided in an embodiment of the utility model;

[0028] Figure 4 yes Figure 3 A magnified view of the structure at B in the middle;

[0029] Figure 5 It is a structural schematic diagram of the magnetic conductive part provided in an embodiment of the utility model.

[0030] In the figure:

[0031] 10. Magnetic slot wedge; 20. Stator core; 201. Open slot; 202. Yoke; 203. Tooth; 204. Clamping groove; 205. Abutting groove;

[0032] 1. Magnetic conductive part; 11. Magnetic conductive sheet; 12. Clamping protrusion; 2. Non-magnetic conductive part; 21. Main body; 22. First limiting part; 23. Second limiting part; 231. Positioning protrusion. DETAILED DESCRIPTION

[0033] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] like Figure 1As shown, this embodiment provides a stator, which includes a stator core 20 and a magnetic slot wedge 10, wherein the stator core 20 includes a plurality of teeth 203, and a plurality of open slots 201 are provided on the stator core 20 along its circumferential direction, and the open slots 201 penetrate the stator core 20 along the radial direction of the stator core 20, and a tooth 203 is sandwiched between two adjacent open slots 201, and the tooth 203 is used for winding coils, and a magnetic slot wedge 10 is clamped and fixed in each open slot 201, and the magnetic slot wedge 10 is blocked at the top opening of the corresponding open slot 201, thereby limiting the coil wound on the tooth 203. In addition, this embodiment also facilitates winding coils on the tooth 203 by designing the slots on the stator core 20 as open slots 201, and after the winding of the coil is completed, the magnetic slot wedge 10 can be installed at the top opening of the open slot 201.

[0038] In this embodiment, if Figure 1 As shown, the stator core 20 further includes a yoke 202, the height of the tooth 203 extends along the axial direction of the motor, the bottom of the tooth 203 is connected to the yoke 202, and the top of the tooth 203 is used to form an axial air gap with the rotor. In addition, it should be noted that the stator provided in this embodiment is immersed in cooling oil, so that the coil and the entire stator are cooled by the cooling oil to ensure the normal operation of the stator.

[0039] The existing magnetic slot wedge usually extends out of the open slot 201 along the radial direction of the stator core 20, which easily leads to magnetic leakage, greatly reducing the performance of the motor. In addition, the portion of the coil that leaks out of the inner and outer diameters of the stator core 20 is easily covered and pressed by the end of the magnetic slot wedge extending out of the open slot 201, which greatly reduces the contact area between the coil and the cooling oil, and reduces the heat dissipation effect of the coil and the entire stator.

[0040] In order to solve the above problems, Figure 1 to Figure 4 As shown, the stator provided in this embodiment has a length of the open slot 201 greater than the length of the magnetic slot wedge 10 along the radial direction of the stator core 20. The stator provided in this embodiment prevents the magnetic slot wedge 10 from extending out of the open slot 201 along the radial direction of the stator core 20 by making the length of the open slot 201 greater than the length of the magnetic slot wedge 10, thereby avoiding the phenomenon of magnetic leakage, optimizing the magnetic circuit, and improving the performance of the motor. In addition, since the magnetic slot wedge 10 does not extend out of the open slot 201 along the radial direction of the stator core 20, the coil that leaks out of the inner and outer diameter parts of the stator core 20 is prevented from being covered and pressed by the magnetic slot wedge 10, thereby increasing the contact area between the coil and the cooling oil and improving the oil cooling and heat dissipation effect on the coil and the entire stator.

[0041] In this embodiment, if Figure 2As shown, the magnetic slot wedge 10 includes an insertion end and a positioning end, which are respectively located at two ends of the magnetic slot wedge 10 along the radial direction of the stator core 20. Along the radial direction of the stator core 20, the insertion end is located in the open slot 201, and the outer end surface of the positioning end is flush with the outer end surface of the tooth portion 203. The above arrangement not only prevents the magnetic slot wedge 10 from extending out of the open slot 201 along the radial direction of the stator core 20, but also makes the outer periphery of the stator smoother and more beautiful.

[0042] In this embodiment, if Figure 1 to Figure 4 As shown, the magnetic slot wedge 10 also includes a magnetic conductive part 1 and a non-magnetic conductive part 2, wherein the outer wall of the magnetic conductive part 1 is engaged with the inner wall of the open slot 201 and is magnetically connected, and along the radial direction of the stator core 20, the non-magnetic conductive part 2 includes a first limiting part 22, a main body 21 and a second limiting part 23 connected in sequence, and the main body 21 is provided with a magnetic conductive part 1, and the magnetic conductive part 1 is located between the first limiting part 22 and the second limiting part 23, the first limiting part 22 is an insertion end, and the second limiting part 23 is a positioning end. In this embodiment, by designing the magnetic slot wedge 10 into the form of a connected magnetic conductive part 1 and a non-magnetic conductive part 2, it is not necessary to set the entire magnetic slot wedge 10 into a magnetic conductive structure, thereby reducing the eddy current phenomenon and improving the efficiency of the motor. In addition, the structural design of the non-magnetic conductive part 2 also effectively avoids the magnetic conductive part 1 from extending out of the open slot 201 along the radial direction of the stator core 20, thereby more effectively avoiding the problem of magnetic leakage.

[0043] Optionally, in this embodiment, the first limiting portion 22 and the second limiting portion 23 are respectively attached to two end surfaces of the magnetic conductive portion 1 along its length direction, thereby playing a role of fixing and limiting the two ends of the magnetic conductive portion 1.

[0044] In this embodiment, if Figure 2 and Figure 4 As shown, a clamping groove 204 is provided on the inner side wall of the opening slot 201, and a clamping protrusion 12 is provided on the outer side wall of the magnetic conductive part 1 along the width direction of the magnetic slot wedge 10, and the clamping protrusion 12 is clamped in the clamping groove 204. By providing the clamping protrusion 12 to correspond to the clamping groove 204 on the inner side wall of the opening slot 201, the stability of the clamping fixation between the magnetic conductive part 1 and the inner side wall of the opening slot 201 is ensured.

[0045] Optionally, in this embodiment, the magnetic slot wedge 10 includes two magnetic conductive portions 1 arranged at intervals along the width direction of the magnetic slot wedge 10. The above arrangement enables the magnetic slot wedge 10 to have snap-fit ​​protrusions 12 on both sides along the width direction thereof, thereby achieving the limiting and fixing effect on the entire magnetic slot wedge 10, and further ensuring the stability and reliability of the snap-fit ​​positioning of the magnetic slot wedge 10 in the open slot 201. In addition, by providing two magnetic conductive portions 1, and each magnetic conductive portion 1 is magnetically connected to the inner side wall of the open slot 201, the function of a semi-open slot is better played, thereby improving the electromagnetic performance of the stator.

[0046] In this embodiment, if Figure 2 and Figure 4 As shown, a positioning protrusion 231 is provided on the outer wall of the second limiting portion 23, and an abutting groove 205 communicating with the clamping groove 204 is also provided on the inner wall of the open slot 201, and the positioning protrusion 231 abuts against the abutting groove 205. When the magnetic slot wedge 10 needs to be clamped and installed in the open slot 201, the insertion end (i.e., the first limiting portion 22) of the magnetic slot wedge 10 is first aligned with the open slot 201, and then the magnetic slot wedge 10 is pushed into the open slot 201 from the outside to the inside along the radial direction of the stator core 20 until the positioning protrusion 231 on the positioning end (i.e., the second limiting portion 23) abuts against the abutting groove 205, thereby achieving the positioning installation of the magnetic slot wedge 10 in the open slot 201, ensuring the accuracy of the installation position of the magnetic slot wedge 10 in the open slot 201, and improving the reliability of the stator.

[0047] It should be noted that, in the present embodiment, along the width direction of the magnetic slot wedge 10, the two opposite outer side walls of the second limiting portion 23 are provided with positioning protrusions 231, and the two opposite inner side walls of the opening slot 201 are provided with abutting grooves 205, the abutting grooves 205 are connected with the clamping grooves 204 on the corresponding side, and the two positioning protrusions 231 respectively abut with the abutting grooves 205 on the corresponding side. In addition, it should be noted that, in the present embodiment, along the width direction of the magnetic slot wedge 10, the positioning protrusion 231 extends outward from the clamping protrusion 12 on the corresponding side, and the size of the abutting groove 205 is matched with the positioning protrusion 231, and the size of the clamping groove 204 is matched with the clamping protrusion 12, so as to ensure that the positioning protrusion 231 abuts in the abutting groove 205 to achieve the positioning effect.

[0048] Optionally, in this embodiment, if Figure 5As shown, the magnetic conductive part 1 includes a plurality of magnetic conductive sheets 11 which are stacked and fixed in sequence along the radial direction of the stator core 20, two adjacent magnetic conductive sheets 11 are insulated from each other, and a clamping protrusion 12 is provided on the outer wall of the magnetic conductive sheet 11. By designing the magnetic conductive part 1 as a plurality of insulated and stacked magnetic conductive sheets 11, the impedance of the magnetic conductive part 1 is effectively increased relative to the structural form of the entire magnetic conductive part 1, thereby further reducing the eddy current loss of the magnetic slot wedge 10.

[0049] The present embodiment also provides a motor, which includes a rotor and the above-mentioned stator, and the stator cooperates with the rotor. The motor provided in the present embodiment avoids the phenomenon of magnetic leakage by applying the above-mentioned stator, optimizes the magnetic circuit, improves the performance of the motor, and also avoids the coils that leak out of the inner and outer diameter parts of the stator core 20 from being covered and pressed by the magnetic slot wedge 10, thereby increasing the contact area between the coil and the cooling oil, and improving the oil cooling and heat dissipation effect of the coil and the entire stator. Optionally, in the present embodiment, the motor can be an axial flux permanent magnet motor.

[0050] 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 skilled 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 implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A stator, characterized in that: include: A stator core (20), the stator core (20) comprising a plurality of teeth (203), the stator core (20) being provided with a plurality of open slots (201) spaced apart along its circumferential direction, the open slots (201) penetrating the stator core (20) along the radial direction of the stator core (20), and one of the teeth (203) being sandwiched between two adjacent open slots (201); and A magnetic slot wedge (10), wherein each of the opening slots (201) is clamped and fixed with a magnetic slot wedge (10), and the magnetic slot wedge (10) is sealed at the top opening of the corresponding opening slot (201); Along the radial direction of the stator core (20), the length of the open slot (201) is greater than the length of the magnetic slot wedge (10).

2. The stator according to claim 1, characterized in that: The magnetic slot wedge (10) comprises an insertion end and a positioning end, wherein the insertion end and the positioning end are respectively located at two ends of the magnetic slot wedge (10) along the radial direction of the stator core (20), and along the radial direction of the stator core (20), the insertion end is located in the open slot (201), and the outer end surface of the positioning end is flush with the outer end surface of the tooth portion (203).

3. The stator according to claim 2, characterized in that: The magnetic slot wedge (10) further comprises: A magnetic conductive portion (1), the outer side wall of the magnetic conductive portion (1) being snap-fitted with the inner side wall of the opening groove (201) and being magnetically connected; and The non-magnetic conductive part (2) comprises a first limiting part (22), a main body (21) and a second limiting part (23) which are connected in sequence along the radial direction of the stator core (20); the main body (21) is provided with the magnetic conductive part (1); the magnetic conductive part (1) is located between the first limiting part (22) and the second limiting part (23); the first limiting part (22) is the insertion end, and the second limiting part (23) is the positioning end.

4. The stator according to claim 3, characterized in that: The first limiting portion (22) and the second limiting portion (23) are respectively fitted to two end surfaces of the magnetic conductive portion (1) along the length direction thereof.

5. The stator according to claim 3, characterized in that: A clamping groove (204) is provided on the inner side wall of the opening groove (201), and a clamping protrusion (12) is provided on the outer side wall of the magnetic conductive portion (1) along the width direction of the magnetic slot wedge (10), and the clamping protrusion (12) is clamped in the clamping groove (204).

6. The stator according to claim 5, characterized in that: The magnetic slot wedge (10) comprises two magnetic conductive parts (1) arranged at intervals along the width direction of the magnetic slot wedge (10).

7. The stator according to claim 5, characterized in that: A positioning protrusion (231) is provided on the outer side wall of the second limiting portion (23), and an abutment groove (205) connected to the clamping groove (204) is also provided on the inner side wall of the opening groove (201), and the positioning protrusion (231) abuts against the abutment groove (205).

8. The stator according to any one of claims 1 to 7, characterized in that: The stator core (20) further comprises a yoke (202), the height of the tooth portion (203) extending along the axial direction of the motor, the bottom of the tooth portion (203) being connected to the yoke (202), and the top of the tooth portion (203) being used to form an axial air gap with the rotor.

9. The stator according to any one of claims 3 to 7, characterized in that: The magnetic conductive part (1) comprises a plurality of magnetic conductive sheets (11) which are stacked and fixed in sequence along the radial direction of the stator core (20), two adjacent magnetic conductive sheets (11) are insulated from each other, and the outer side walls of the magnetic conductive sheets (11) are snap-fitted and magnetically connected to the inner side walls of the opening slots (201).

10. A motor, comprising a rotor, characterized in that: The motor further comprises a stator as claimed in any one of claims 1 to 9, wherein the stator cooperates with the rotor.

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