CN219697376U - Stator core, motor and electric drive system - Google Patents

Abstract

The utility model relates to a stator core, a motor and an electric drive system, wherein the stator core comprises: a first member having a ring shape and an outer periphery having a first diameter, the outer periphery being provided with a recess; the second member is annular, the outer periphery of the second member is provided with a second diameter, the second diameter is smaller than the first diameter, the outer periphery of the second member is provided with a protruding part, the protruding part is provided with a concave part and a cavity, and the concave part of the protruding part and the concave part of the first member are positioned at the same position in the circumferential direction; a third member having a ring shape and an outer periphery of which has a second diameter, a protruding portion provided at the outer periphery of the third member, the protruding portion having a recessed portion, the recessed portion of the protruding portion of the third member being located at the same position in the circumferential direction as the recessed portion of the first member; the protruding portion of the third member does not entirely cover the cavity of the second member as viewed in the axial direction of the stator core. The stator core improves the strength of the welding seam and ensures the cooling performance.

Description

Stator core, motor and electric drive system

Technical Field

The utility model relates to the technical field of motors, in particular to a stator core, a motor and an electric drive system.

Background

The main components of the motor include a stator assembly and a rotor assembly. For electric machines that do not use permanent magnets, the stator assembly includes a stator core and stator windings, and the rotor assembly includes a rotor and rotor windings. The stator winding is mounted on the stator core, and when a current is passed through the stator winding, a magnetic field is generated in the stator core. The magnetic field interacts with the rotor assembly to rotate the rotor, converting electrical energy into mechanical energy.

Because of the electrical resistance of the windings, the current inevitably generates heat in the windings during operation of the motor, which requires cooling of the windings of the motor and the like. In addition, as the requirements of new energy automobiles on motor performance are higher, the power and the rotating speed of the motor are higher, and the heat generated during the operation of the motor is correspondingly increased. Accordingly, there is a continuing need in the art of electric machines for improvements in cooling technology for electric machines.

Disclosure of Invention

In combination with research and improvement of the motor cooling technology by the applicant, the utility model provides the following technical scheme for further improving the cooling performance of the motor.

A stator core, comprising:

a first member having a ring shape and an outer periphery of which has a first diameter, a recess being provided on the outer periphery;

the stator core further includes:

a second member having a ring shape and an outer periphery thereof having a second diameter smaller than the first diameter, a protruding portion provided at the outer periphery thereof, the protruding portion of the second member having a recess and a cavity, the recess of the protruding portion of the second member being at the same position in the circumferential direction as the recess of the first member;

a third member having a ring shape and an outer periphery thereof having a second diameter, a protruding portion being provided at the outer periphery thereof, the protruding portion of the third member having a recessed portion, the recessed portion of the protruding portion of the third member being at the same position in the circumferential direction as the recessed portion of the first member;

the protruding portion of the third member does not entirely cover the cavity of the second member as viewed in the axial direction of the stator core.

According to one aspect of the utility model, the number of the first members is plural, and the plural first members form a first group of first members and a second group of first members, the second members and the third members being located between the first group of first members and the second group of first members.

According to an aspect of the present utility model, the number of the second members is plural, the number of the third members is plural, and the plurality of the second members are closely arranged to each other, and the plurality of the third members are closely arranged to each other.

According to one aspect of the utility model, the number of second members is plural, the number of third members is plural, and there are two second members between which there is at least one third member.

According to one aspect of the present utility model, a plurality of holes are provided in the first member, the number of the concave portions is plural, the plurality of holes do not overlap with the concave portions in the circumferential direction, and at least a part of the holes is located between the first diameter and the second diameter.

According to an aspect of the present utility model, the plurality of holes are divided into a plurality of sections in the circumferential direction, and the plurality of holes in each section are uniformly arranged in the circumferential direction.

According to an aspect of the present utility model, the protruding portion of the second member includes two first extending portions each extending outward from an outer periphery of the second member, and one second extending portion connecting the two first extending portions, the cavity being formed between the two first extending portions and the second extending portion, the recessed portion of the second member being located on the second extending portion.

According to one aspect of the present utility model, the protruding portion of the third member includes a first extending portion extending outwardly from an outer periphery of the third member, and a second extending portion extending laterally from an end of the first extending portion, and the recessed portion of the third member is located on the second extending portion.

According to an aspect of the present utility model, the first extension of the third member does not entirely cover the cavity of the second member as viewed in the axial direction of the stator core.

The utility model also provides a motor which is provided with the shell and the stator core.

The utility model also provides an electric drive system which comprises at least one of an inverter and a speed reducer and the motor.

According to the scheme of the utility model, the welding seam of the stator core is consistent in the axial direction and is welded along the outer diameter of the core, the welding seam is not influenced by the annular oil groove in the circumferential direction, the strength of the welding seam is improved, and the integral rigidity, torsion resistance and shearing resistance of the stator core are ensured; meanwhile, through the new oil way design, the oil can be ensured to normally fill the annular oil groove, and oil is sprayed to the two ends of the stator for cooling.

Other features and advantages of the present utility model will be described in the following detailed description of the utility model, taken in conjunction with the accompanying drawings.

Drawings

Exemplary embodiments of the present utility model are described with reference to the accompanying drawings, in which:

fig. 1 shows a perspective view of a stator core of the present utility model and an enlarged view of a portion in a circle.

Fig. 2 shows a top view of a first member constituting the stator core and an enlarged view of a portion in a circle.

Fig. 3 shows a top view of a second member constituting the stator core and an enlarged view of a portion in a circle.

Fig. 4 shows a top view of a third member constituting the stator core and an enlarged view of a portion in a circle.

Fig. 5 shows a perspective view of the stator core of the present utility model cut along the circumferential flow path and an enlarged view of a portion in a circle.

All the figures are schematic and not necessarily to scale, and they show only those parts which are necessary in order to elucidate the utility model, the other parts being omitted or merely mentioned. That is, the present utility model may include other components in addition to those shown in the drawings.

In the drawings, identical and/or functionally identical technical features are provided with the same or similar reference signs.

Detailed Description

Embodiments of the present utility model are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding and enabling description of the utility model to one skilled in the art. It will be apparent, however, to one skilled in the art that the present utility model may be practiced without some of these specific details. Furthermore, it should be understood that the utility model is not limited to specific described embodiments. Rather, any combination of the features and elements described below is contemplated to implement the utility model, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered features or limitations of the claims except where explicitly set out in a claim.

Description of orientations such as "upper", "lower", "inner", "outer", "radial", "axial", etc. which may be used in the following description are for convenience of description only and are not intended to limit the inventive arrangements in any way unless explicitly stated. Furthermore, terms such as "first," "second," and the like, are used hereinafter to describe elements of the present utility model, and are merely used for distinguishing between the elements and not intended to limit the nature, sequence, order, or number of such elements.

Fig. 1 shows a perspective view of a stator core of the present utility model and an enlarged view of a portion in a circle. As can be seen in fig. 1, the stator core 10 is generally cylindrical in shape having an outer surface and an interior cavity for receiving a rotor assembly. On the outer surface of the stator core 10, a first flow passage 11 in the circumferential direction is opened, and the first flow passage 11 is annular in shape as a whole. The first flow passage 11 is preferably located at the middle of the stator core in the axial direction. The stator core 10 is further provided with a plurality of axially extending second flow passages 12, and the plurality of second flow passages 12 are preferably uniformly arranged in the circumferential direction and are located at the same position near the outer surface in the radial direction. The first flow passage 11 and the plurality of second flow passages 12 are in fluid communication.

In order to accommodate the stator winding, the stator core 10 is provided with a plurality of stator teeth 13 on a radially inner side thereof, and tooth slots 14 are formed between the stator teeth 13, the tooth slots 14 being for accommodating a portion of the stator winding.

The stator core 10 of the present utility model is formed from a plurality of stator laminations. The stator lamination may be made of silicon steel sheets. Accordingly, in order to construct the plurality of stator laminations as one unitary stator core, a recess is provided on the outer periphery of each stator lamination so that the plurality of stator laminations are formed into one unitary body by welding at the location of the recess. Fig. 1 shows such a recess 15. When all stator laminations are stacked, the recess of each stator lamination forms a recess that is continuous in the axial direction.

As previously mentioned, the second flow passage 12 is located radially close to the outer surface, but should be at a distance from the outer surface. This is because the stator core needs to be fitted into the housing by means of an interference fit, and if the second flow passage 12 is too close to the outer surface, the strength of the entire stator core may not be satisfactory; on the other hand, because the second flow channel 12 needs to be in fluid communication with the first flow channel 11, the depth of the first flow channel 11 cannot be too deep, which would otherwise lead to weakening of the stator strength and a large difference in the dimensions of the stator core at this location from those at other locations, thereby affecting the electromagnetic performance of the motor. Meanwhile, as can also be seen from fig. 1, the second flow passage 12 is located at a distance from the recess 15 in the circumferential direction, so that the influence on the strength of the stator core can be avoided.

An important improvement of the utility model consists in the structural design at the first flow channel 11 and the recess 15, as shown in fig. 1 by the circles indicated by broken lines and the corresponding enlarged views. This structure will be described in detail below in conjunction with other figures.

Fig. 2 shows a top view of a first member constituting the stator core and an enlarged view of a portion in a circle. The first member 101 shown in fig. 2 has a first diameter, and a plurality of first members 101 form portions of the stator core 10 shown in fig. 1 located on both sides of the first flow passage 11. The first member 10 is provided with a recess 15 on its outer surface and a plurality of holes 121 in its radial position close to the outer surface so as to form the first flow channel 12 together with corresponding holes on the other first members.

The holes 121 may have various shapes. For example, it may be a quadrilateral. Further, the first member may be rectangular, or may be an arc with two sides parallel to the peripheral outline of the first member, and the other two sides being parallel line segments, or may be an arc with two sides parallel to the peripheral outline of the first member, and the other two sides being located on two diameters.

The plurality of holes 121 are divided into a plurality of sections by the recess 15 in the circumferential direction of the first member, and in each section, the plurality of holes 121 are uniformly arranged in the circumferential direction. The hole 121 adjacent to the recess 15 is located at a distance from the recess 15 in the circumferential direction. As can be seen from fig. 2, no hole 121 is provided in the radial direction in which the recess 15 is provided. The recess 15 is located circumferentially between the two holes 121, but also need not be exactly in the middle of the two holes 121. The recesses 15 are preferably also circumferentially distributed, the number of which may be, for example, 8, but of course may be other as long as the welding requirements are met.

The bore is preferably located radially between a first diameter and a second diameter, which will be defined below, thereby enabling the second flow passage 12 to be in substantial fluid communication with the first flow passage 11.

Fig. 3 shows a top view of a second member constituting the stator core and an enlarged view of a portion in a circle. The second member 102 shown in fig. 3 has a second diameter that is smaller than the first diameter of the first member 101. As can be seen in connection with fig. 1, 2 and 3, the second member 102 is located between two portions formed by the plurality of first members 101 over the entire stator core, and half of the difference between the first diameter and the second diameter is the depth of the first flow passage 11.

In order to connect the second members 102 to each other and also connect the second members 102 to the first member 101 adjacent thereto or to the third member 103 to be described later, it is also necessary to provide the recess 15 on the second member 102.

In the related art, the recess 15 is directly formed on the outer circumferential surface of the second member. Thus, the first flow passage 11 forms a communicating flow passage in the circumferential direction, but the recess 15 of the entire stator core is lowered there, which makes it necessary for the depth of the recess 15 on the first member to be relatively large, so that a smooth continuous weld is formed with the recess on the second member, welding the plurality of members together. The scheme makes the welding seam of the stator core too deep, the welding gas is not easy to exhaust, and the stress at the junction of the first flow passage 11 and the iron cores of other two sections is larger, and larger shearing force is generated when the stator core is assembled with the shell in an interference manner, so that the welding seam is cracked.

In order to solve the above-described problems, as an important improvement of the present utility model, as shown in fig. 3, on the outer peripheral surface of the second member 102, a plurality of projections are provided, the number and positions of which match those of the recesses 15 of the first member 101. The plurality of protrusions have the same shape. Each of the protruding portions has two first extending portions 1021 extending from the outer peripheral surface of the second member 102, and a second extending portion 1022 for connecting the two first extending portions 1021. The two first extensions 1021 may be parallel to each other or may be located on two diameters of the second member 102, respectively. On one side of the second extension 1022, a recess 15 is provided, and the position and shape of the recess 15 matches the position and shape of the recess 15 of the first member 101. The rest of the side of the second extension 1022, which is provided with the recess 15, except for the recess 15 may be arc-shaped having a first diameter, i.e., being flush with the outer circumferential surface of the first member 101, or may be a straight line segment, in which case the side is recessed in a radial direction with respect to the outer circumferential surface of the first member 101. Two first extension parts 1021 and one second extension part 1022 form a cavity with the outer circumferential surface of the second member 102, which may form a part of a flow passage of the cooling liquid together with the third member 103 described below.

Fig. 4 shows a top view of a third member constituting the stator core and an enlarged view of a portion in a circle. The third member 103 shown in fig. 4 has a second diameter, that is, the third member 103 has the same diameter as the second member 102. As can be seen in connection with fig. 1, 2 and 4, the third member 103 is located between the two parts formed by the plurality of first members 101 over the entire stator core.

In order to connect the third members 103 to each other and also to connect the third members 103 to the first members 101 adjacent thereto or to the second members 102, it is also necessary to provide the recess 15 on the third members 103.

As shown in fig. 4, on the outer peripheral surface of the third member 103, a plurality of projections are provided, the number and positions of which match those of the recesses 15 of the first member 101. The plurality of protrusions have the same shape. Each of the protruding portions has a first extension 1031 extending from the outer peripheral surface of the third member 103, and a second extension 1032 extending laterally at the end of the first extension 1031. The first extension 1031 is preferably located in a radial direction. On one side of the second extension 1032, a recess 15 is provided, the position and shape of the recess 15 matching the position and shape of the recess 15 of the first member 101. The rest of the side of the second extension 1032 provided with the recess 15, except for the recess 15, may be arc-shaped having a first diameter, i.e. being flush with the outer circumferential surface of the first member 101, or may be a straight line segment, in which case the side is recessed in a radial direction with respect to the outer circumferential surface of the first member 101. The first extension 1031 has a smaller dimension in the circumferential direction than the cavity of each protrusion of the second member 102. That is, when the second member 102 and the third member 103 are stacked and their respective recesses 15 are aligned, the first extension 1031 of the third member 103 cannot completely cover or close the cavity of the protrusion of the second member 102.

As another possible embodiment, on the third member 103, if the first extension 1031 is sized in the circumferential direction to meet the relevant requirements, for example, the width requirement of the recess 15, the second extension 1032 may not be provided. In this case, the circumferential dimension of the first extension 1031 may be appropriately increased, but the cavity of the protruding portion of the second member 102 may still not be completely covered or closed.

As a preferred embodiment, as shown in fig. 4, the end of the first extension 1031 is located at a substantially middle position of the second extension 1032.

Fig. 5 shows a perspective view of a section of the stator core of the present utility model along the circumferential flow path, i.e., the first flow path 11, and an enlarged view of a portion in a circle. The positional relationship described in the previous paragraph is clearly seen from the enlarged view in fig. 5. Specifically, the first extension 1031 of the third member 103 is located between the two first extensions 1021 of the second member. The first flow passage 11 forms a bend at the first extension 1031 of the third member 103 and the two first extensions 1021 of the second member, but is communicated in the circumferential direction as a whole.

For the entire stator core, the plurality of first members 101 are divided into two groups, respectively located on both sides of the first flow passage 11. The plurality of second members 102 and the plurality of third members 103 are positioned between the two pluralities of first members, thereby forming the first flow path 11. As for the arrangement of the plurality of second members 102 and the plurality of third members 103, the plurality of second members 102 may be arranged closely to each other, the plurality of third members 103 may be arranged closely to each other, or the plurality of second members 102 and the plurality of third members 103 may be alternately arranged so long as a flow passage for passing the cooling liquid can be formed therebetween.

The stator core of the present utility model is described in detail above. From the above, the stator core is composed of three stator laminations, so that the cooling liquid flows from the inner side of the welding line in the radial direction, the smoothness of an oil way is ensured, the cooling effect is ensured, the welding line extends on the outer surface of the whole stator in the axial direction, the welding line is at the same height, and the welding quality and the strength of the whole stator core are effectively ensured.

While the present utility model has been described with respect to the above exemplary embodiments, it will be apparent to those skilled in the art that various other embodiments can be devised by modifying the disclosed embodiments without departing from the spirit and scope of the utility model. Such embodiments should be understood to fall within the scope of the utility model as determined based on the claims and any equivalents thereof.

Claims (10)

1. A stator core, comprising:

a first member having a ring shape and an outer periphery of which has a first diameter, a recess being provided on the outer periphery;

the stator core further includes:

a second member having a ring shape and an outer periphery thereof having a second diameter smaller than the first diameter, a protruding portion provided at the outer periphery thereof, the protruding portion of the second member having a recess and a cavity, the recess of the protruding portion of the second member being at the same position in the circumferential direction as the recess of the first member;

a third member having a ring shape and an outer periphery thereof having a second diameter, a protruding portion being provided at the outer periphery thereof, the protruding portion of the third member having a recessed portion, the recessed portion of the protruding portion of the third member being at the same position in the circumferential direction as the recessed portion of the first member;

the protruding portion of the third member does not entirely cover the cavity of the second member as viewed in the axial direction of the stator core.

2. The stator core as claimed in claim 1, wherein,

the number of first members is plural, and the plural first members form a first group of first members and a second group of first members, with the second members and the third members being located between the first group of first members and the second group of first members.

3. The stator core as claimed in claim 2, wherein,

the number of the second members is plural, the number of the third members is plural, and the plurality of the second members are closely arranged to each other, and the plurality of the third members are closely arranged to each other; or alternatively

The number of second members is plural, the number of third members is plural, and there are two second members between which there is at least one third member.

4. The stator core according to any one of claim 1 to 3, wherein,

a plurality of holes are provided in the first member, the number of the recesses is plural, the plurality of holes do not overlap with the recesses in the circumferential direction, and at least a portion of the holes are located between the first diameter and the second diameter.

5. The stator core as claimed in claim 4, wherein,

the plurality of holes are divided into a plurality of sections in the circumferential direction, and the plurality of holes in each section are uniformly arranged in the circumferential direction.

6. The stator core according to any one of claim 1 to 3, wherein,

the protruding portion of the second member includes two first extending portions each extending outward from an outer circumference of the second member, and one second extending portion connecting the two first extending portions, the cavity being formed between the two first extending portions and the second extending portion, the recessed portion of the second member being located on the second extending portion.

7. The stator core according to any one of claim 1 to 3, wherein,

the protruding portion of the third member includes a first extending portion extending outward from an outer periphery of the third member, and a second extending portion extending laterally from an end of the first extending portion, and the recessed portion of the third member is located on the second extending portion.

8. The stator core as claimed in claim 7, wherein,

the first extension of the third member does not completely cover the cavity of the second member as seen in the axial direction of the stator core.

9. An electric machine having a housing, characterized in that the electric machine further comprises a stator core according to any one of claims 1-8.

10. An electric drive system comprising at least one of an inverter and a decelerator, the electric drive system further comprising the electric machine of claim 9.