CN115347691A - Motor stator and motor - Google Patents

Abstract

The invention provides a motor stator and a motor, wherein a plurality of conductor sets comprise: the stator core comprises a first conductor group, a third conductor group and a second conductor group, wherein the first conductor group is positioned on the radial inner side of the stator core, the third conductor group is positioned on the radial outer side of the stator core, the second conductor group is positioned on the radial outer side of the stator core except the inner side and the outer side of the stator core, the first conductor group comprises a plurality of conductors, 2 conductors of the first conductor group are arranged along the radial adjacent 2 layers of the same slot of the stator core, and the sectional areas of the plurality of conductors of the first conductor group are the same; the sectional area of the third conductor set is equal to that of the second conductor set, and the sectional area of the third conductor set is equal to 2 times that of the first conductor set; according to the technical scheme of the motor stator in the embodiment of the application, the eddy current loss on the stator winding caused by the skin effect is reduced through the arrangement of the conductor group in the slot, so that the motor efficiency is improved.

Description

Motor stator and motor

Technical Field

The invention relates to the field of motors, in particular to a motor stator and a motor.

Background

In the prior vehicle, in order to realize high efficiency, miniaturization and integration of the motor, the flat wire motor adopts a flat wire conductor with a larger cross section area as a stator winding, although the advantages of high efficiency and high power density are brought to the motor. However, when the motor is operated at a high speed, the skin effect of the flat wire conductor near the notch becomes more obvious due to the high-frequency change of the magnetic field, and the eddy current loss generated thereby affects the operation performance of the motor.

Disclosure of Invention

In view of the problems in the prior art, an object of the present invention is to provide a stator of an electric motor and an electric motor, which reduce eddy current loss on a stator winding caused by a skin effect by arranging a conductor set in a slot, thereby improving efficiency of the electric motor.

In order to achieve the above object, according to one aspect of the present invention, there is provided a stator of an electric motor, comprising:

a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core;

a stator winding including a plurality of conductor groups sequentially inserted into a plurality of slots of the stator core in a radial direction of the stator core;

the plurality of conductor sets includes: the stator core comprises a first conductor group positioned on the radial inner side of the stator core, a third conductor group positioned on the radial outer side of the stator core and a second conductor group positioned on the radial outer side of the stator core except the inner side and the outer side of the stator core, wherein the first conductor group comprises a plurality of conductors, 2 conductors of the first conductor group are arranged along the radial adjacent 2 layers of the same slot of the stator core, and the sectional areas of the plurality of conductors of the first conductor group are the same;

the sectional area of the third conductor set is equal to that of the second conductor set, and the sectional area of the third conductor set is equal to 2 times that of the first conductor set;

or the cross-sectional area of the third conductor set is equal to the cross-sectional area of the first conductor set, and the cross-sectional area of the third conductor set is equal to 1/2 times the cross-sectional area of the second conductor set.

Further, the plurality of conductor groups of the stator winding are all rectangular conductors.

Further, the third conductor group comprises a plurality of conductors, 2 conductors of the third conductor group are arranged along the radial direction of the same slot of the stator core in the adjacent 2 layers, and the width of the conductors of the third conductor group is equal to that of the conductors of the first conductor group.

Further, the third conductor group comprises a plurality of conductors, the plurality of conductors of the third conductor group are positioned on the same layer of the stator core in the radial direction, and the width of the conductors of the third conductor group is equal to 2 times of the width of the conductors of the first conductor group.

Further, the third conductor group comprises a plurality of conductors, 1 conductor of the third conductor group is positioned at 2 layers in the radial direction of the stator core, and the width of the conductor of the third conductor group is equal to 2 times of the width of the conductor of the first conductor group.

Further, the second conductor group comprises a plurality of conductors, 1 conductor of the second conductor group is located in 2 layers in the radial direction of the stator core, and the width of the conductor of the second conductor group is equal to 2 times of the width of the conductor of the first conductor group.

Further, the plurality of conductors of the first conductor set is 4 conductors.

Further, 2 conductors of the first conductor group, which are arranged along the radial direction of the stator core and adjacent to 2 layers, are alternately arranged on the radial inner side of the stator core along the circumferential direction of the stator core.

According to another aspect of the invention, an electric machine is provided, comprising an electric machine stator as described above.

By applying the technical scheme of the invention, the motor stator and the motor comprise: a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at predetermined slot pitches in a circumferential direction of the stator core; a stator winding including a plurality of conductor groups sequentially inserted into a plurality of slots of the stator core in a radial direction of the stator core; the plurality of conductor sets includes: the stator core comprises a first conductor group positioned on the radial inner side of the stator core, a third conductor group positioned on the radial outer side of the stator core and a second conductor group positioned on the radial outer side of the stator core except the inner side and the outer side of the stator core, wherein the first conductor group comprises a plurality of conductors, 2 conductors of the first conductor group are arranged along the radial adjacent 2 layers of the same slot of the stator core, and the sectional areas of the plurality of conductors of the first conductor group are the same; the sectional area of the third conductor set is equal to that of the second conductor set, and the sectional area of the third conductor set is equal to 2 times that of the first conductor set; or the cross-sectional area of the third conductor set is equal to the cross-sectional area of the first conductor set, and the cross-sectional area of the third conductor set is equal to 1/2 times the cross-sectional area of the second conductor set. The technical scheme of motor stator in the embodiment of the application, it reduces the eddy current loss on the stator winding that skin effect arouses through the setting that is located the radial inboard first conductor group of stator core to improve motor efficiency.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In the drawings:

fig. 1 is a schematic structural diagram of a stator of a motor according to a first embodiment of the present invention;

fig. 2 is a schematic sectional view of a stator of a motor according to a first embodiment of the present invention;

FIG. 3 is an enlarged partial view of a schematic cutaway view of the motor stator of FIG. 2;

fig. 4 is a schematic sectional view of a stator of a motor according to a second embodiment of the present invention;

FIG. 5 is an enlarged partial view of a schematic cutaway view of the motor stator of FIG. 4;

fig. 6 is a schematic sectional view of a stator of a motor according to a third embodiment of the present invention;

FIG. 7 is an enlarged partial view of a schematic sectional view of the motor stator of FIG. 6;

in the figure: 10. a stator winding; 20. a stator core; 21. a slot; 22. a tooth portion; 500. a first conductor set; 600. a second conductor set; 700. a third conductor set.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.

It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.

The invention provides a motor stator. Fig. 1 exemplarily shows one direction A1A2 extending along the circumferential direction and two directions 0001 and 0002 extending along the radial direction, and it should be noted that the radial inner side of the stator core in this application may be the direction away from the central axis of the stator core or the direction close to the central axis of the stator core.

Exemplarily, as shown in fig. 1, in an embodiment, there is provided a stator for an electric motor, including a stator core 20, the stator core 20 having a plurality of slots 21, the plurality of slots 21 being formed on a radially inner surface of the stator core 20 and spaced apart at a predetermined slot pitch in a circumferential direction of the stator core 20.

As shown in fig. 1, the stator winding 10 includes a plurality of conductor sets sequentially inserted into a plurality of slots 21 of the stator core 20 in a radial direction of the stator core 20.

Referring to fig. 1 to 7, in the present embodiment, the stator winding 10 is mounted on the stator core 20, that is, the plurality of phase windings mounted on the stator core 20 are different from each other in electrical phase, and in the first embodiment, the second embodiment, and the third embodiment, the stator winding 10 is a three-phase (i.e., U-phase winding, V-phase winding, W-phase winding) winding, and each phase slot of each pole is equal to 2; each pole of the rotor is provided with 6 slots 21, the rotor has eight poles and is such that for each phase of the three-phase stator winding 10, the number of slots 21 provided in the stator core 20 is equal to 48 (i.e., 2X8X 3), and further, in the present embodiment, the stator core 20 defines one tooth 22 by two adjacent slots 21, and the stator core 20 is formed by laminating a plurality of annular magnetic steel plates at both end faces in the axial direction of the stator core, and other conventional metal plates may be used instead of the magnetic steel plates.

Illustratively, the plurality of conductor sets (500, 600, 700) includes: a first conductor group 500 located at the radial inner side of the stator core 20, a third conductor group 700 located at the radial outer side of the stator core 20, and a second conductor group 600 (i.e. an intermediate layer) located at the radial outer side of the stator core 20, wherein the first conductor group 500 includes a plurality of conductors, 2 conductors of the first conductor group 500 are arranged along the radial adjacent 2 layers of the same slot 21 of the stator core 20, and the cross-sectional areas of the plurality of conductors of the first conductor group 500 are the same; the cross-sectional area of the third conductor set 700 is equal to the cross-sectional area of the second conductor set 600, and the cross-sectional area of the third conductor set 700 is equal to 2 times the cross-sectional area of the first conductor set 500; or the cross-sectional area of the third conductor set 700 is equal to the cross-sectional area of the first conductor set 500, and the cross-sectional area of the third conductor set 700 is equal to 1/2 times the cross-sectional area of the second conductor set 600.

With reference to fig. 1 to 7, the plurality of conductor sets includes: the first conductor groups 500 located on the radial inner side of the stator core 20, and the 12 first conductor groups 500 are sequentially located on the inner sides of 48 slots in the circumferential direction of the stator core; the third conductor group 700 positioned on the radial outer side of the stator core, and the 12 third conductor groups 700 (or the 24 third conductor groups 700) are sequentially positioned on the outer sides of the 48 slots on the circumferential direction of the stator core; and the second conductor groups 600 located in the middle of the stator core 20 except the inner side and the outer side in the radial direction, and the 24 second conductor groups 600 are sequentially located in the middle sides of the 48 slots in the circumferential direction of the stator core (namely, located outside the inner side and the outer side in the radial direction of the stator core). The first conductor group 500 includes 4 conductors, each 2 conductors are disposed in adjacent slots along the circumferential direction of the stator core for one unit, and each 2 conductors are disposed in 2 layers radially adjacent to the stator core for another unit, specifically, a first conductor of the first conductor group is disposed in a first layer on the inner side of the first slot, a second conductor is disposed in a first layer on the inner side of the second slot, a third conductor is disposed in a second layer on the inner side of the first slot, and a fourth conductor is disposed in a second layer on the inner side of the second slot, a first conductor and a second conductor of the first conductor group are disposed in adjacent slots along the circumferential direction of the stator core for one unit, a third conductor and a fourth conductor of the first conductor group are disposed in adjacent slots along the circumferential direction of the stator core for one unit, a first conductor and a third conductor of the first conductor group are disposed in 2 layers radially adjacent to a single slot of the stator core for another unit, and a second conductor and a fourth conductor of the first conductor group are disposed in 2 layers radially adjacent to a single slot of the stator core for another unit, that is 2 conductors of the first conductor group disposed in the same radial direction of the stator core; the cross-sectional areas of the 4 conductors of the first conductor set 500 are the same; in the third embodiment, the sectional area of the sum of the conductors of one third conductor group 700 inserted into the stator core slot 21 is equal to the sectional area of the sum of the conductors of one second conductor group 600 inserted into the stator core slot 21, and the sectional area of the sum of the conductors of one third conductor group 700 inserted into the stator core slot 21 is equal to 2 times the sectional area of the sum of the conductors of one first conductor group 500 inserted into the stator core slot 21; in the first and second embodiments, the cross-sectional area of the conductor of the one third conductor set 700 inserted into the stator core slot 21 is equal to the cross-sectional area of the sum of the conductors of the one first conductor set 500 inserted into the stator core slot 21, and the cross-sectional area of the one third conductor set inserted into the stator core slot 21 is equal to 1/2 times the cross-sectional area of the sum of the conductors of the one second conductor set 600 inserted into the stator core slot 21. The technical scheme of motor stator in the embodiment of the application, it reduces the eddy current loss on the stator winding that skin effect arouses through the setting that is located the radial inboard first conductor group of stator core to improve motor efficiency.

With reference to fig. 1 to 7, in the first, second, and third embodiments, the conductors of the first conductor group 500, the conductors of the second conductor group 600, and the conductors of the third conductor group 700 of the stator winding 10 are rectangular conductors.

Illustratively, as shown in fig. 2 and 3, in the first embodiment, the third conductor set 700 includes 4 conductors, 2 conductors of the third conductor set are arranged in 2 layers adjacent to each other in the radial direction of the same slot of the stator core, and the width of the conductor of the third conductor set 700 is equal to the width of the conductor of the first conductor set 500.

With reference to fig. 2 and 3, the third conductor group 700 includes 4 conductors, each 2 conductors are one unit and are located in adjacent slots along the circumferential direction of the stator core, each 2 conductors are another unit and are located in 2 layers along the radial direction of the stator core, specifically, a first conductor of the third conductor group 700 is located in a first layer outside the first slot, a second conductor of the third conductor group 700 is located in a first layer outside the second slot, a third conductor of the third conductor group 700 is located in a second layer outside the first slot, a fourth conductor of the third conductor group 700 is located in a second layer outside the second slot, the first conductor and the second conductor of the third conductor group 700 are one unit and are located in adjacent slots along the circumferential direction of the stator core, the third conductor and the fourth conductor of the third conductor group 700 are one unit and are located in adjacent slots along the circumferential direction of the stator core, the first conductor and the third conductor of the third conductor group 700 are located in 2 layers radially adjacent to the same slot as the other unit, and the second conductor of the third conductor group 700 are located in adjacent slots 2 layers radially adjacent to the same radial direction of the same stator core; the width inside each slot of each conductor of the third conductor set 700 is equal to the width inside each slot of each conductor of the first conductor set 500.

Exemplarily, as shown in fig. 4 and 5, in the second embodiment, the third conductor set 700 includes a plurality of conductors, the plurality of conductors of the third conductor set 700 are located at the same layer in the radial direction of the stator core 20, and the width of the conductor of the third conductor set 700 is equal to 2 times the width of the conductor of the first conductor set 500.

With reference to fig. 4 and 5, the third conductor set 700 includes 2 conductors, the 2 conductors of the third conductor set 700 are located in the first layer on the radial outer side of the stator core 20, specifically, the two slots of the first conductor of the third conductor set 700 are located in the first slot and the seventh slot of the first layer on the radial outer side of the stator core, the two slots of the second conductor of the third conductor set 700 are located in the second slot and the eighth slot of the first layer on the radial outer side of the stator core, each slot of each conductor of the third conductor set 700 is located in the first layer on the radial outer side of the stator core, the width of each conductor of the third conductor set 700 is equal to 2 times the width of each conductor of the first conductor set 500, and the cross-sectional area of the conductor of the third conductor set is increased relative to the cross-sectional area of the conductor of the first conductor set, so as to reduce the direct current resistance.

For example, as shown in fig. 6 and 7, in the third embodiment, the third conductor set 700 includes a plurality of conductors, 1 conductor of the third conductor set 700 is located at 2 layers in the radial direction of the stator core 20, and the width of the conductor of the third conductor set 700 is equal to 2 times the width of the conductor of the first conductor set 500.

With reference to fig. 6 and 7, the third conductor group 700 includes 2 conductors, two slot interiors of each conductor of the third conductor group 700 are located in 2 radially adjacent layers of the stator core, specifically, a first slot interior of a first conductor of the third conductor group 700 is located in a1 st slot of a first layer on a radial outer side of the stator core, a second slot interior is located in a 7 th slot of a second layer on the radial outer side of the stator core, a first slot interior of a second conductor of the third conductor group 700 is located in a2 nd slot of the first layer on the radial outer side of the stator core, and a second slot interior is located in a 8 th slot of the second layer on the radial outer side of the stator core; the width inside each slot of each conductor of the third conductor set 700 is equal to 2 times the width inside each slot of each conductor of the first conductor set 500, and since the sectional area of the conductor of the third conductor set 700 is increased with respect to the sectional area of the conductor of the first conductor set 500, the direct current resistance is reduced.

Further, as shown in fig. 1 to 7, in the embodiment, the second conductor group 600 includes 2 conductors, and two slot interiors of each conductor of the second conductor group 600 are located in 2 radially adjacent layers of the stator core, specifically, a first slot interior of a first conductor of the second conductor group 600 is located in a1 st slot of a third layer radially inside the stator core, a 7 th slot interior of a second conductor of the second conductor group 600 is located in a 7 th slot of a fourth layer radially inside the stator core, a first slot interior of a second conductor of the second conductor group 600 is located in a2 nd slot of a third layer radially inside the stator core, and a second slot interior of a second conductor of the second conductor group 600 is located in a 8 th slot of a fourth layer radially inside the stator core; the width inside each slot of each conductor of the second conductor set 600 is equal to 2 times the width inside each slot of each conductor of the first conductor set 500.

With reference to fig. 1 to 7, in an embodiment, the first conductor group 500 includes 4 conductors, each 2 conductors are disposed in adjacent slots along the circumferential direction of the stator core for one unit, each 2 conductors are disposed in 2 radially adjacent layers along the stator core for another unit, specifically, a first layer inside a first slot of a first conductor is located inside a1 st slot, a second layer inside a second slot of the first conductor is located inside a 7 th slot, a first layer inside a first slot of a second conductor is located inside a2 nd slot, a second layer inside a second slot of the second conductor is located inside an 8 th slot, a second layer inside a first slot of a third conductor is located inside a1 st slot, a first layer inside a second slot of a third conductor is located inside a 7 th slot, a second layer inside a first slot of a fourth conductor is located inside a2 nd slot, a second layer inside a second slot of a fourth conductor is located inside a 8 th slot, that is, a first conductor group is disposed in adjacent layers along the radial direction of the stator core, and a stator core is disposed alternately in the second radial direction of the stator core for the stator core and the second conductor group.

The embodiment also provides a motor, which comprises the motor stator and a motor adopting the motor stator.

The motor provided by the embodiment of the present invention includes the motor stator in the above embodiment, and therefore, the motor provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not described herein again.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection may be mechanical or electrical, may be direct, may be indirect via an intermediate medium (busbar connection), or may be communication between the two components. Those skilled in the art can understand what is specifically meant by the present invention. Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments illustrated herein, and that various obvious changes, rearrangements and substitutions may be made therein by those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

FIG. 7

Claims (9)

1. An electric machine stator comprising:

a stator core having a plurality of slots formed on a radially inner surface thereof and spaced apart at a predetermined slot pitch in a circumferential direction of the stator core;

a stator winding including a plurality of conductor groups sequentially inserted into the plurality of slots of the stator core in a radial direction of the stator core;

the method is characterized in that: a plurality of the conductor sets include: the stator core comprises a first conductor group, a third conductor group and a second conductor group, wherein the first conductor group is positioned on the radial inner side of the stator core, the third conductor group is positioned on the radial outer side of the stator core, the second conductor group is positioned on the radial outer side of the stator core except the inner side and the outer side of the stator core, the first conductor group comprises a plurality of conductors, 2 conductors of the first conductor group are arranged along the radial adjacent 2 layers of the same slot of the stator core, and the sectional areas of the plurality of conductors of the first conductor group are the same;

the cross-sectional area of the third conductor set is equal to the cross-sectional area of the second conductor set, and the cross-sectional area of the third conductor set is equal to 2 times the cross-sectional area of the first conductor set;

or the sectional area of the third conductor set is equal to the sectional area of the first conductor set, and the sectional area of the third conductor set is equal to 1/2 times the sectional area of the second conductor set.

2. The electric machine stator of claim 1, wherein the plurality of conductor sets of the stator winding are each rectangular conductors.

3. The electric machine stator of claim 2, wherein the third conductor set comprises a plurality of conductors, wherein 2 conductors of the third conductor set are disposed along radially adjacent 2 layers of a same slot of the stator core and wherein the width of the conductors of the third conductor set is equal to the width of the conductors of the first conductor set.

4. The electric machine stator of claim 2, wherein the third conductor set comprises a plurality of conductors positioned in a radially same layer of the stator core and having a width equal to 2 times a width of the conductors of the first conductor set.

5. The electric machine stator of claim 2, wherein the third conductor set comprises a plurality of conductors, 1 conductor of the third conductor set is located at 2 radial layers of the stator core and the width of the conductor of the third conductor set is equal to 2 times the width of the conductor of the first conductor set.

6. The electric machine stator of any one of claims 3 to 5, wherein the second conductor set comprises a plurality of conductors, 1 conductor of the second conductor set is located at 2 radial layers of the stator core and the width of the conductor of the second conductor set is equal to 2 times the width of the conductor of the first conductor set.

7. The electric machine stator of any one of claims 1 to 5, wherein the plurality of conductors of the first conductor set is 4 conductors.

8. The electric machine stator according to any one of claims 1 to 5, wherein the 2 conductors of the first conductor group arranged in 2 layers adjacent to each other in the radial direction of the stator core are alternately arranged radially inside the stator core in the circumferential direction of the stator core.

9. An electrical machine comprising an electrical machine stator according to any one of claims 1 to 8.

Images