CN216699642U - Rotor punching sheet and permanent magnet motor magnetic circuit topological structure - Google Patents

Abstract

The utility model provides a rotor punching sheet and a magnetic circuit topological structure of a permanent magnet motor, wherein the rotor punching sheet comprises a plurality of rotor poles and a rotating shaft hole which are distributed along the circumferential direction and are mutually connected, the outer side edge of each rotor pole comprises a first arc-shaped edge, a second arc-shaped edge and a third arc-shaped edge, two ends of the second arc-shaped edge are respectively connected with the first arc-shaped edge and the third arc-shaped edge, the circle center of the first arc-shaped edge and the circle center of the third arc-shaped edge are deviated from the circle center of the second arc-shaped edge, the rotating shaft hole is positioned at the center of the rotor punching sheet, and the circle center of the second arc-shaped edge is superposed with the circle center of the rotating shaft hole. By the arrangement, the harmonic content of the air gap magnetic field can be reduced, the sine of the back electromotive force and the air gap flux density is realized, the influence of the cogging torque and each subharmonic of the permanent magnet motor on the motor is reduced, and further the torque pulsation and the noise and vibration of the motor are reduced.

Description

Rotor punching sheet and permanent magnet motor magnetic circuit topological structure

Technical Field

The utility model relates to the technical field of motors, in particular to a rotor punching sheet and a magnetic circuit topological structure of a permanent magnet motor.

Background

At present, in a centralized winding permanent magnet motor, the defect that armature reaction magnetomotive force contains a large amount of harmonic waves exists, so that the loss of a stator and rotor iron core is increased, and the eddy current loss of a permanent magnet is increased. Because the rotor is difficult to radiate heat, the risk of demagnetization of the permanent magnet is easily caused, and the improvement of the motor performance is limited; the electromagnetic vibration and noise of the motor are synthesized by electromagnetic waves generated by a series of stator and rotor magnetic field harmonics in an air gap and the structural mode of the motor, and the noise vibration of the motor is a problem to be solved urgently because the air gap magnetic field of the centralized winding permanent magnet motor contains abundant harmonics.

Therefore, the present invention is directed to provide a rotor sheet and a magnetic circuit topology structure of a permanent magnet motor, so as to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a rotor punching sheet and a magnetic circuit topological structure of a permanent magnet motor

A plurality of rotor poles are circumferentially distributed and interconnected. The outer side of each rotor pole includes a first arc-shaped side, a second arc-shaped side, and a third arc-shaped side. The two ends of the second arc-shaped edge are respectively connected with the first arc-shaped edge and the third arc-shaped edge. The circle center of the first arc-shaped edge and the circle center of the third arc-shaped edge are deviated from the circle center of the second arc-shaped edge. The rotating shaft hole is located at the center of the rotor punching sheet, and the circle center of the second arc-shaped edge is coincided with the circle center of the rotating shaft hole.

In one embodiment, the ratio of the second arc-shaped edge to the polar arc ranges from 1: 2.24-1: 2.32.

in one embodiment, the radius of curvature of the first curved side is equal to the radius of curvature of the third curved side, and the ratio of the radius of curvature of the first curved side to the radius of curvature of the second curved side ranges from 1: 4-1: 4.15.

in an embodiment, a magnet groove is formed in a surface of each rotor pole facing the rotating shaft hole, each rotor pole further includes a magnetic isolation bridge, the magnetic isolation bridges are located on two sides of the magnet groove, and a ratio range of a length of each magnetic isolation bridge to a thickness of the magnet groove is 1: 1.08-1: 1.12.

in one embodiment, each of the rotor poles further includes stress slots located at corners of the magnet slots.

In one embodiment, a slot is formed in a surface of each rotor pole, a connection line between a center point of the slot and a center point of the rotating shaft hole is defined as a first line segment, a connection line between a center point of the second arc-shaped edge and a center point of the rotating shaft hole is defined as a second line segment, and an included angle between the first line segment and the second line segment ranges from 12 ° to 16 °.

In an embodiment, the number of the slots formed in the surface of each rotor pole is two, the slots are respectively located at two ends of the rotor pole, and the ratio of the length of a connecting line between the center points of the two slots to the length of the magnet slot is 1: 1.18-1: 1.45.

The utility model also provides a magnetic circuit topological structure of the permanent magnet motor, which comprises the rotor punching sheet and the stator punching sheet in any embodiment. The stator punching sheet is sleeved on the outer edge of the rotor punching sheet, and an air gap is formed between the stator punching sheet and the rotor punching sheet.

In one embodiment, the stator punching sheet comprises a plurality of stator teeth which are uniformly distributed along the circumferential direction, each stator tooth is provided with an arc-shaped part and a cutting part, two ends of the arc-shaped part along the circumferential direction are connected with the cutting parts, and the ratio of the central angle of the arc-shaped part to the angle of the stator teeth ranges from 1:1.1 to 1: 1.9.

In one embodiment, the length ratio of the side edge of the cutting part to the side edge of the stator tooth before cutting is 1: 1.85-1: 1.9.

One advantage of the present invention is to provide a rotor sheet and a magnetic circuit topology structure of a permanent magnet motor, in which an outer side edge of a rotor pole is optimally designed, so that a non-uniform air gap is formed between the rotor sheet and a stator sheet, the non-uniform air gap can greatly reduce the harmonic content of an air gap magnetic field, realize the sine of back electromotive force and air gap flux density, reduce the influence of cogging torque and each subharmonic of the permanent magnet motor on the motor, and further reduce torque ripple, and noise and vibration of the motor. And because the first arc-shaped edge and the third arc-shaped edge are eccentrically arranged, the variation trend of the magnetic flux density can be relaxed, the torque output by the motor is not weakened too much, and the torque output by the motor is ensured.

The utility model has another advantage of providing a rotor punching sheet and a magnetic circuit topological structure of the permanent magnet motor, and the magnetic leakage of the permanent magnet can be reduced and the magnetic leakage coefficient can be reduced by prolonging the length of the magnetic isolation bridge.

The utility model has another advantage of providing a rotor punching sheet and a magnetic circuit topological structure of a permanent magnet motor, and the slot holes are arranged on the surface of the rotor pole, so that the sine degree of the air gap flux density of the motor can be optimized, and the cogging torque can be reduced.

The utility model has another advantage of providing a rotor punching sheet and a magnetic circuit topological structure of a permanent magnet motor, which can increase local magnetic resistance and reduce the penetration of harmonic waves to a permanent magnet through the arrangement of stress slots, thereby increasing the demagnetization working point of the permanent magnet.

The utility model has another advantage of providing a rotor punching sheet and a magnetic circuit topological structure of a permanent magnet motor, wherein the arc-shaped part and the cutting part on the stator teeth are matched, so that the magnetic density distribution on the surface of a rotor iron core tends to be uniform, the integral combined magnetic circuit structure can effectively improve the magnetic conductance and magnetomotive force at an air gap, optimize the sine degree of the air gap magnetic density of the motor, reduce the demagnetization risk of a permanent magnet and the torque of a tooth groove, and further achieve the purposes of reducing torque fluctuation and weakening the noise vibration effect of the motor.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts; in the following description, the drawings are illustrated in a schematic view, and the drawings are not intended to limit the present invention.

Fig. 1 is a schematic structural diagram of a rotor sheet according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a single rotor pole of the present invention;

FIG. 3 is a dimensional schematic of FIG. 2;

fig. 4 is a schematic structural diagram of a magnetic circuit topology of a permanent magnet motor according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of the stator teeth of the utility model.

Reference numerals:

1-permanent magnet machine magnetic circuit topology; 10-rotor punching; 12-a rotor pole; 121-a first arc-shaped edge; 122-a second arc-shaped edge; 123-a third arc-shaped edge; 14-a rotating shaft hole; 16-pole arc; 18-a magnetic isolation bridge; 20-stress groove; 22-slotted holes; 24-a magnet slot; 30-stator punching; 32-stator teeth; 34-an arc-shaped portion; 36-a cutting portion; 40-air gap; s1 — first line segment; s2 — second line segment; a-included angle; b-central angle of the arc part; c-angle of stator teeth; l1-length of magnetic shield bridge; h1-thickness of magnet slot; L2-Link Length; l3 — length of magnet slot; l4-length of cutting section side; l5-the length of the uncut side of the stator tooth.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; the technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the utility model and to simplify the description, but are not intended to indicate or imply that the device or component being referred to must have a particular orientation or be constructed and operated in a particular orientation and therefore are not to be construed as limiting the utility model. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In addition, the term "comprises" and any variations thereof mean "including at least".

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integrally formed connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic structural diagram of a rotor sheet 10 according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a single rotor pole 12 according to the present invention, and fig. 3 is a schematic dimensional diagram of fig. 2. To achieve at least one of the advantages or other advantages, an embodiment of the present invention provides a rotor punching sheet 10. As shown in the figure, the rotor punching sheet 10 includes a plurality of rotor poles 12 and a rotating shaft hole 14. In the present embodiment, the number of the rotor poles 12 is 8, and the rotation shaft hole 14 is located at the center of the rotor punching sheet 10.

The 8 rotor poles 12 are distributed along the circumferential direction and connected with each other to form the outer contour of the rotor sheet 10. The outer side of each rotor pole 12 includes a first arcuate side 121, a second arcuate side 122, and a third arcuate side 123 (the boundaries of the arcuate sides are indicated by arrows in fig. 2). The two ends of the second arc-shaped edge 122 are respectively connected to the first arc-shaped edge 121 and the third arc-shaped edge 123, in other words, the outline of the rotor sheet 10 is a closed line formed by sequentially connecting the first arc-shaped edge 121, the second arc-shaped edge 122 and the third arc-shaped edge 123. The first arc-shaped edge 121, the second arc-shaped edge 122 and the third arc-shaped edge 123 are arcs cut from a circle, and the center of the second arc-shaped edge 122 coincides with the center of the rotating shaft hole 14. The center of the first arc-shaped edge 121 and the center of the third arc-shaped edge 123 are both deviated from the center of the second arc-shaped edge 122 (the center of each arc-shaped edge refers to the center of the circle where each arc-shaped edge is located), that is, the center of the first arc-shaped edge 121 and the center of the third arc-shaped edge 123 are offset from the center of the second arc-shaped edge 122, so as to form an eccentric structure. Therefore, when the stator punching sheet is matched with the rotor punching sheet 10 in a sleeved mode, the first arc-shaped edge 121, the second arc-shaped edge 122 and the third arc-shaped edge 123 are arranged in the outer contour mode, so that a non-uniform air gap is formed between the stator punching sheet and the rotor punching sheet 10, the harmonic content of an air gap magnetic field is reduced, the sine of back electromotive force and air gap flux density is realized, the influence of tooth space torque and each subharmonic of a permanent magnet motor on the motor is reduced, and then torque pulsation, noise and vibration of the motor are reduced. Moreover, the first arc-shaped edge 121 and the third arc-shaped edge 123 are in an offset state, so that the variation trend of the magnetic density is relatively mild, the torque output by the motor is not weakened too much, and the torque output by the motor is ensured.

In one embodiment, as shown in FIGS. 1 and 2, to reduce the harmonic content of the airgap field, the ratio of the second arc-shaped edge 122 to the pole arc 16 (shown in phantom in FIG. 2) is in the range of 1: 2.24-1: 2.32. preferably, the radius of curvature of the first arc-shaped edge 121 is equal to the radius of curvature of the third arc-shaped edge 123, and the first arc-shaped edge 121 and the second arc-shaped edge 122 may be different arcs taken from the same circle. The ratio of the radius of curvature of the first curved edge 121 to the radius of curvature of the second curved edge 122 ranges from 1: 4-1: 4.15. the centers of the first arc-shaped side 121 and the third arc-shaped side 123 of each rotor pole 12 are distributed on the same circle.

In an embodiment, as shown in fig. 1 and 2, each rotor pole 12 may further include a magnetic isolation bridge 18 and a stress slot 20, a slot 22 is opened on a surface of each rotor pole 12, and a magnet slot 24 is provided on a surface of each rotor pole 12 facing the rotation axis hole 14.

The magnetic isolation bridges 18 are positioned on two sides of the magnet groove 24, and the ratio of the length L1 of the magnetic isolation bridges 18 to the thickness H1 of the magnet groove 24 is in the range of 1: 1.08-1: 1.12 to make permanent magnet and iron core can complete the cooperation, reduce the magnetic leakage of permanent magnet, reduce the magnetic leakage coefficient.

The whole harmonic content of the motor is considered to be large, the corners of the permanent magnets are prone to demagnetization risks, and then the stress slots 20 are arranged at the corners of the magnet slots 24, so that local magnetic resistance is increased, penetration of the harmonic waves to the permanent magnets is reduced, and demagnetization working points of the permanent magnets are increased.

A line connecting the center point of the slot 22 and the center point of the spindle hole 14 is defined as a first line segment S1, and a line connecting the center point of the second arc-shaped edge 122 and the center point of the spindle hole 14 is defined as a second line segment S2 (the first line segment S1 and the second line segment S2 are marked by dotted lines in fig. 1). The included angle A between the first line segment S1 and the second line segment S2 ranges from 12 degrees to 16 degrees, so that the cogging torque is reduced while the sine degree of the air gap flux density of the motor is optimized. Preferably, the number of slots 22 formed in the surface of each rotor pole 12 is two, i.e., two slots 22 are formed in one magnetic pole. The two slots 22 are respectively located at two ends of the rotor pole 12, and the slots 22 are located between the magnetic isolation bridges 18 at two sides and symmetrically distributed along the second line segment S2. The ratio of the length L2 of the connecting line between the center points of the two slot holes 22 to the length L3 of the magnet slot 24 is 1: 1.18-1: 1.45, so that the sine degree of the air gap magnetic density of the motor can be further optimized, and the cogging torque is reduced. In addition, the two slots 22 on each rotor pole 12 may also be asymmetrically distributed, so long as the range of the included angle a is satisfied, the sine degree of the air gap flux density of the motor can be optimized, and the cogging torque can be reduced. The shape of the slot 22 is a kidney-shaped hole, but the present disclosure is not limited thereto, and the slot 22 may also be in other shapes such as triangle, circle, square or polygon.

Referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of a magnetic circuit topology 1 of a permanent magnet motor according to an embodiment of the present invention, and fig. 5 is a schematic structural diagram of a stator tooth 32 according to the present invention. To achieve at least one of the advantages or other advantages, an embodiment of the present invention provides a magnetic circuit topology 1 for a permanent magnet motor. As shown in the figure, the magnetic circuit topology 1 of the permanent magnet motor includes a stator punching sheet 30 and a rotor punching sheet 10 according to the foregoing embodiment. The detailed structure and technical effects of the rotor sheet 10 are not described in detail.

The stator lamination 30 is sleeved on the outer edge of the rotor lamination 10, and an air gap 40 is formed between the stator lamination 30 and the rotor lamination 10. The air gap 40 is the non-uniform air gap 40 formed between the stator lamination 30 and the rotor lamination 10. The stator punching sheet 30 includes a plurality of stator teeth 32 uniformly distributed along a circumferential direction, and each stator tooth 32 has an arc portion 34 and a cutting portion 36. Both ends of the arc portion 34 in the circumferential direction are connected to the cutting portion 36, that is, both left and right ends of the arc portion 34 are connected to the cutting portion 36.

As shown in FIG. 5, the ratio of the central angle B of the arc portion 34 to the angle C of the stator teeth 32 is 1: 1.1-1: 1.9. The angle C of the stator tooth 32 is an angle between the farthest end points of the cutting portions 36 on the left and right sides, and a left end value line of the angle C of the stator tooth 32 is parallel to a left end value line of the central angle B of the arc portion 34, and a right end value line of the angle C of the stator tooth 32 is parallel to a right end value line of the central angle B of the arc portion 34. Preferably, the ratio of the length L4 of the side of the cutting part 36 to the length L5 of the side of the stator tooth 32 before cutting is 1: 1.85-1: 1.9. The length L5 of the uncut side edge of the stator tooth 32 is the distance from the intersection point of the extension line of the side edge of the cutting portion 36 toward the rotation axis hole 14 and the extension line of the arc portion 34 to the starting point of the side edge of the cutting portion 36, and the point on the side edge of the cutting portion 36 farthest from the intersection point is the starting point, i.e., the upper end point in fig. 5. By means of the ratio range, the magnetic density distribution on the surface of the rotor core tends to be uniform, the magnetic conductance and magnetomotive force at the air gap 40 can be effectively improved by the integral combined magnetic circuit structure, the sine degree of the magnetic density of the air gap 40 of the motor is optimized, the demagnetization risk of the permanent magnet and the cogging torque are reduced, and therefore the purposes of reducing torque fluctuation and weakening the noise vibration effect of the motor are achieved.

In summary, an advantage of the present invention is to provide a rotor sheet 10 and a magnetic circuit topology 1 of a permanent magnet motor, in which an outer side edge of a rotor pole 12 is optimally designed, so that a non-uniform air gap 40 is formed between the rotor sheet 10 and a stator sheet 30, the non-uniform air gap 40 can greatly reduce the harmonic content of a magnetic field of the air gap 40, thereby achieving the sine of a back electromotive force and a magnetic density of the air gap 40, reducing the influence of a cogging torque and each subharmonic of the permanent magnet motor on the motor, and further reducing torque ripple, and noise and vibration of the motor. In addition, the first arc-shaped edge 121 and the third arc-shaped edge 123 are eccentrically arranged, so that the variation trend of magnetic density is relatively mild, the torque output by the motor is not weakened too much, and the torque output by the motor is ensured.

Another advantage of the present invention is to provide a rotor punching sheet 10 and a magnetic circuit topology 1 of a permanent magnet motor, which can reduce the magnetic leakage of a permanent magnet and the magnetic leakage coefficient by extending the length of the magnetic isolation bridge 18.

Another advantage of the present invention is to provide a rotor sheet 10 and a magnetic circuit topology 1 of a permanent magnet motor, in which the slot 22 is disposed on the surface of the rotor pole 12, so that the cogging torque can be reduced while the sine degree of the magnetic density of the motor air gap 40 is optimized.

Another advantage of the present invention is to provide a rotor sheet 10 and a magnetic circuit topology 1 of a permanent magnet motor, which can increase local magnetic resistance and reduce the penetration of harmonic waves to a permanent magnet by the arrangement of stress slots 20, so that the demagnetization operating point of the permanent magnet is increased.

Another advantage of the present invention is to provide a rotor punching sheet 10 and a magnetic circuit topology structure 1 of a permanent magnet motor, in which the arc portion 34 and the cutting portion 36 on the stator teeth 32 are cooperatively arranged, so that the magnetic density distribution on the surface of the rotor core tends to be uniform, the overall combined magnetic circuit structure can effectively improve the magnetic conductance and magnetomotive force at the air gap 40, optimize the sine degree of the magnetic density of the motor air gap 40, and reduce the risk of demagnetization of the permanent magnet and the cogging torque, thereby achieving the purposes of reducing torque fluctuation and weakening the noise and vibration effect of the motor.

In addition, it will be appreciated by those skilled in the art that, although there may be many problems with the prior art, each embodiment or aspect of the present invention may be improved only in one or several respects, without necessarily simultaneously solving all the technical problems listed in the prior art or in the background. It will be understood by those skilled in the art that nothing in a claim should be taken as a limitation on that claim.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The rotor punching sheet is characterized by comprising:

the rotor comprises a plurality of rotor poles which are distributed along the circumferential direction and are mutually connected, wherein the outer side edge of each rotor pole comprises a first arc-shaped edge, a second arc-shaped edge and a third arc-shaped edge, two ends of the second arc-shaped edge are respectively connected with the first arc-shaped edge and the third arc-shaped edge, and the circle center of the first arc-shaped edge and the circle center of the third arc-shaped edge are deviated from the circle center of the second arc-shaped edge; and

and the rotating shaft hole is positioned at the center of the rotor punching sheet, and the circle center of the second arc-shaped edge is superposed with the circle center of the rotating shaft hole.

2. The rotor sheet of claim 1, wherein: the ratio range of the second arc-shaped edge to the polar arc is 1: 2.24-1: 2.32.

3. the rotor sheet according to claim 1, wherein: the curvature radius of the first arc-shaped edge is equal to that of the third arc-shaped edge, and the ratio range of the curvature radius of the first arc-shaped edge to that of the second arc-shaped edge is 1: 4-1: 4.15.

4. the rotor sheet according to claim 1, wherein: each rotor pole is towards the surface in pivot hole is provided with the magnet groove, each rotor pole still includes and separates the magnetic bridge, it is located to separate the magnetic bridge the both sides in magnet groove, separate the specific value scope of the length of magnetic bridge and the thickness in magnet groove and be 1: 1.08-1: 1.12.

5. the rotor sheet according to claim 4, wherein: each of the rotor poles further includes stress slots located at corners of the magnet slots.

6. The rotor sheet of claim 1, wherein: the surface of each rotor pole is provided with a slotted hole, a connecting line of a central point of the slotted hole and a central point of the rotating shaft hole is defined as a first line segment, a connecting line of a central point of the second arc-shaped edge and a central point of the rotating shaft hole is defined as a second line segment, and an included angle between the first line segment and the second line segment ranges from 12 degrees to 16 degrees.

7. The rotor sheet as recited in claim 6, wherein: the number of the slotted holes formed in the surface of each rotor pole is two, the slotted holes are respectively located at two ends of each rotor pole, and the ratio of the length of a connecting line between the center points of the two slotted holes to the length of the magnet slot ranges from 1:1.18 to 1: 1.45.

8. A permanent magnet motor magnetic circuit topology, characterized in that, permanent magnet motor magnetic circuit topology includes:

the rotor sheet as recited in any one of claims 1 to 7; and

and the stator punching sheet is sleeved on the outer edge of the rotor punching sheet and forms an air gap with the rotor punching sheet.

9. The permanent magnet electric machine magnetic circuit topology of claim 8, wherein: the stator punching sheet comprises a plurality of stator teeth which are uniformly distributed along the circumferential direction, each stator tooth is provided with an arc-shaped part and a cutting part, two ends of each arc-shaped part along the circumferential direction are connected with the cutting parts, and the ratio of the central angle of each arc-shaped part to the angle of each stator tooth is 1: 1.1-1: 1.9.

10. The permanent magnet electric machine magnetic circuit topology of claim 9, wherein: the length ratio of the side edge of the cutting part to the side edge of the stator tooth before cutting is 1: 1.85-1: 1.9.

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