Rotor lamination and permanent magnet machine magnetic circuit topology

Abstract

The application provides a rotor lamination and a permanent magnet motor magnetic circuit topology structure. The rotor lamination comprises a plurality of rotor poles and a rotating shaft hole which are distributed along a circumferential direction and are connected with each other. The outer side of each rotor pole comprises a first arc-shaped side, a second arc-shaped side and a third arc-shaped side. The two ends of the second arc-shaped side are connected with the first arc-shaped side and the third arc-shaped side respectively. The center of the first arc-shaped side and the center of the third arc-shaped side are both deviated from the center of the second arc-shaped side. The rotating shaft hole is located at the center of the rotor lamination. The center of the second arc-shaped side is coincident with the center of the rotating shaft hole. By the arrangement, the harmonic content of the air gap magnetic field can be reduced, the back electromotive force and the air gap magnetic density can be sinusoidal, the influence of the cogging torque and each harmonic of the permanent magnet motor on the motor can be reduced, and then the torque ripple, the noise and the vibration of the motor can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor lamination and a permanent magnet motor magnetic circuit topology. BACKGROUND

[0002] At present, in the centralized winding permanent magnet motor, there is a disadvantage that the armature reaction magnetic motive force contains a large amount of harmonics, which leads to the increase of the stator and rotor core loss and the increase of the permanent magnet eddy current loss. Because of the difficulty in heat dissipation of the rotor, the permanent magnet demagnetization risk is easy to cause, which limits the improvement of the motor performance; and the electromagnetic vibration and noise of the motor are the electromagnetic force waves generated by a series of stator and rotor magnetic field harmonics in the air gap and the structure mode of the motor itself. Because the air gap magnetic field of the centralized winding permanent magnet motor contains rich harmonics, the noise and vibration of the motor are the problems to be solved for the permanent magnet motor.

[0003] Therefore, the main purpose of the present application is to provide a rotor lamination and a permanent magnet motor magnetic circuit topology to solve the above problems. SUMMARY

[0004] The present application provides a rotor lamination and a permanent magnet motor magnetic circuit topology, which comprises a plurality of rotor poles and a shaft hole

[0005] The plurality of rotor poles are distributed along the circumferential direction and connected with each other. The outer side of each rotor pole comprises a first arc-shaped side, a second arc-shaped side and a third arc-shaped side. The two ends of the second arc-shaped side are connected with the first arc-shaped side and the third arc-shaped side respectively. The center of the first arc-shaped side and the center of the third arc-shaped side are both deviated from the center of the second arc-shaped side. The shaft hole is located at the center of the rotor lamination, and the center of the second arc-shaped side is coincided with the center of the shaft hole.

[0006] In an embodiment, the ratio of the second arc-shaped side to the pole arc is in the range of 1:2.24-1:2.32.

[0007] In an embodiment, the curvature radius of the first arc-shaped side is equal to the curvature radius of the third arc-shaped side, and the ratio of the curvature radius of the first arc-shaped side to the curvature radius of the second arc-shaped side is in the range of 1:4-1:4.15.

[0008] In an embodiment, the surface of each rotor pole facing the shaft hole is provided with a magnet slot, and each rotor pole further comprises a magnetic isolation bridge located on both sides of the magnet slot, and the ratio of the length of the magnetic isolation bridge to the thickness of the magnet slot is in the range of 1:1.08-1:1.12.

[0009] In an embodiment, each rotor pole further comprises a stress slot located at the corner of the magnet slot.

[0010] In an embodiment, the surface of each rotor pole is provided with a slot hole, a line connecting the center point of the slot hole and the center point of the rotating shaft hole is defined as a first line segment, a line connecting the midpoint of the second arc-shaped edge and the center point of the rotating shaft hole is defined as a second line segment, and the included angle between the first line segment and the second line segment ranges from 12° to 16°.

[0011] In an embodiment, the surface of each rotor pole is provided with two slot holes, which are located at two ends of the rotor pole respectively, and the ratio of the length of the line connecting the center points of the two slot holes to the length of the magnet slot ranges from 1:1.18 to 1:1.45.

[0012] The application also provides a magnetic circuit topology structure of a permanent magnet motor, which comprises the rotor lamination and the stator lamination according to any one of the above embodiments. The stator lamination is sleeved on the outer edge of the rotor lamination and forms an air gap with the rotor lamination.

[0013] In an embodiment, the stator lamination comprises a plurality of stator teeth uniformly distributed in the circumferential direction, each stator tooth has an arc-shaped part and a cutting part, the two ends of the arc-shaped part in the circumferential direction are connected to the cutting part, and the ratio of the central angle of the arc-shaped part to the angle of the stator tooth ranges from 1:1.1 to 1:1.9.

[0014] In an embodiment, the ratio of the length of the side of the cutting part to the length of the side of the stator tooth before cutting ranges from 1:1.85 to 1:1.9.

[0015] An advantage of the application is to provide a rotor lamination and a magnetic circuit topology structure of a permanent magnet motor, which optimizes the design of the outer side of the rotor pole, forms a non-uniform air gap between the rotor lamination and the stator lamination, greatly reduces the harmonic content of the air gap magnetic field, realizes the sinusoidalization of the back electromotive force and the air gap magnetic density, reduces the influence of the cogging torque and each harmonic of the permanent magnet motor on the motor, and further reduces the torque ripple, noise and vibration of the motor. Moreover, since the first arc-shaped edge and the third arc-shaped edge are eccentrically arranged, the magnetic density change trend is relatively moderate, the torque output by the motor is not weakened too much, and the torque output by the motor is ensured.

[0016] Another advantage of the application is to provide a rotor lamination and a magnetic circuit topology structure of a permanent magnet motor, which can reduce the magnetic leakage of the permanent magnet and reduce the magnetic leakage coefficient by extending the length of the magnetic isolation bridge.

[0017] Another advantage of the application is to provide a rotor lamination and a magnetic circuit topology structure of a permanent magnet motor, which can reduce the cogging torque while optimizing the sinusoidal degree of the air gap magnetic density of the motor by providing a slot hole on the surface of the rotor pole.

[0018] Another advantage of the present application is to provide a rotor lamination and a permanent magnet motor magnetic circuit topology, by setting the stress groove, the local magnetic resistance can be increased, and the penetration of harmonics to the permanent magnet can be reduced, so that the demagnetization working point of the permanent magnet is increased.

[0019] Another advantage of the present application is to provide a rotor lamination and a permanent magnet motor magnetic circuit topology, by setting the stress groove, the local magnetic resistance can be increased, and the penetration of harmonics to the permanent magnet can be reduced, so that the demagnetization working point of the permanent magnet is increased.

[0020] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by means of the structures particularly pointed out in the description, claims, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor; In the following description, the positional relationship described in the drawings is the direction of the components drawn in the drawings as the reference, unless otherwise specified.

[0022] Figure 1 is a structural schematic diagram of a rotor lamination provided by an embodiment of the present application;

[0023] Figure 2 is a structural schematic diagram of a single rotor pole provided by an embodiment of the present application;

[0024] Figure 3 is a size schematic diagram of Figure 2 ;

[0025] Figure 4 is a structural schematic diagram of a permanent magnet motor magnetic circuit topology provided by an embodiment of the present application;

[0026] Figure 5 is a structural schematic diagram of a stator tooth provided by an embodiment of the present application.

[0027] REFERENCE SIGNS:

[0028] 1 - Permanent magnet motor magnetic circuit topology; 10 - rotor lamination; 12 - rotor pole; 121 - first arc edge; 122 - second arc edge; 123 - third arc edge; 14 - shaft hole; 16 - pole arc; 18 - magnetic bridge; 20 - stress slot; 22 - slot hole; 24 - magnet slot; 30 - stator lamination; 32 - stator tooth; 34 - arc part; 36 - cutting part; 40 - air gap; S1 - first line segment; S2 - second line segment; A - included angle; B - central angle of arc part; C - angle of stator tooth; L1 - length of magnetic bridge; H1 - thickness of magnet slot; L2 - length of connecting line; L3 - length of magnet slot; L4 - length of cutting part side edge; L5 - length of stator tooth side edge before cutting. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application but not all the embodiments of the present application. The technical features designed in different implementation manners of the present application can be combined with each other as long as there is no conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "transverse", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or component referred to must have a particular orientation, or be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, the term "comprising" and any variation thereof means "at least including".

[0031] In the description of the present application, it is necessary to point out that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] 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 in this specification, 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.

[0033] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a structural schematic diagram of a rotor lamination 10 provided by an embodiment of the present application, Figure 2 is a structural schematic diagram of a single rotor pole 12, Figure 3 is a size schematic diagram of Figure 2 . In order to achieve at least one of the advantages or other advantages, an embodiment of the present application provides a rotor lamination 10. As shown in the figure, the rotor lamination 10 includes a plurality of rotor poles 12 and a shaft hole 14. In this embodiment, the number of rotor poles 12 is 8, and the shaft hole 14 is located at the center of the rotor lamination 10.

[0034] The eight rotor poles 12 are distributed along the circumferential direction and connected to each other to form the outer contour of the rotor lamination 10. Each rotor pole 12 includes a first arc-shaped side 121, a second arc-shaped side 122, and a third arc-shaped side 123 Figure 2The second arc-shaped edge 122 is connected to the first arc-shaped edge 121 and the third arc-shaped edge 123, in other words, the outer contour line of the rotor lamination 10 is a closed line formed by the first arc-shaped edge 121, the second arc-shaped edge 122 and the third arc-shaped edge 123 in sequence. The first arc-shaped edge 121, the second arc-shaped edge 122 and the third arc-shaped edge 123 are circular arcs taken from a circle, and the center of the circle of the second arc-shaped edge 122 coincides with the center of the rotation shaft hole 14. The center of the circle of the first arc-shaped edge 121 and the center of the circle of the third arc-shaped edge 123 are both offset from the center of the circle of the second arc-shaped edge 122 (the center of the circle of each arc-shaped edge refers to the center of the circle of which each arc-shaped edge is taken), that is, the center of the circle of the first arc-shaped edge 121 and the center of the circle of the third arc-shaped edge 123 are offset from the center of the circle of the second arc-shaped edge 122, forming an eccentric structure. In this way, when the stator lamination is fitted on the rotor lamination 10, the non-uniform air gap is formed between the stator lamination and the rotor lamination 10 by the outer contour of the first arc-shaped edge 121, the second arc-shaped edge 122 and the third arc-shaped edge 123, which reduces the harmonic content of the air gap magnetic field, realizes the sinusoidal of back electromotive force and air gap magnetic density, reduces the influence of the cogging torque and each harmonic of the permanent magnet motor on the motor, and further reduces the torque ripple, noise and vibration of the motor. Moreover, since the first arc-shaped edge 121 and the third arc-shaped edge 123 are in an offset state, the magnetic density change trend is relatively moderate, thereby the torque output by the motor is not weakened too much, and the torque output by the motor is ensured.

[0035] In an embodiment, as shown in Figure 1 and Figure 2 to reduce the harmonic content of the air gap magnetic field, the ratio of the second arc-shaped edge 122 to the pole arc 16 Figure 2 is shown by a dashed line) 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 can be different circular arcs taken from the same circle. The ratio of the radius of curvature of the first arc-shaped edge 121 to the radius of curvature of the second arc-shaped edge 122 is in the range of 1:4-1:4.15. The centers of the circles of the first arc-shaped edge 121 and the third arc-shaped edge 123 in each rotor pole 12 are distributed on the same circle.

[0036] In an embodiment, as shown in Figure 1 and Figure 2 Each rotor pole 12 can further include a magnetic isolation bridge 18 and a stress groove 20, and each rotor pole 12 is provided with a slot hole 22 on the surface, and each rotor pole 12 is provided with a magnet slot 24 on the surface facing the rotation shaft hole 14.

[0037] The magnetic isolation bridge 18 is located on both sides of the magnetic pole slot 24, and the ratio of the length L1 of the magnetic isolation bridge 18 to the thickness H1 of the magnetic pole slot 24 ranges from 1:1.08 to 1:1.12, so that the permanent magnet and the iron core can be completely matched, the magnetic flux leakage of the permanent magnet is reduced, and the magnetic flux leakage coefficient is reduced.

[0038] Considering that the overall harmonic content of the motor is large, the corners of the permanent magnet are more prone to demagnetization risk, and then the stress groove 20 is arranged at the corner of the magnetic pole slot 24 to increase the local magnetic resistance and reduce the penetration of harmonics to the permanent magnet, so that the demagnetization working point of the permanent magnet is increased.

[0039] The line segment S1 is defined as the line connecting the center point of the slot hole 22 and the center point of the rotating shaft hole 14, and the line segment S2 is defined as the line connecting the midpoint of the second arc-shaped side 122 and the center point of the rotating shaft hole 14. Figure 1 The included angle A between the first line segment S1 and the second line segment S2 ranges from 12° to 16°, so that the sine degree of the motor air gap magnetic flux density is optimized while the cogging torque is reduced. Preferably, the number of the slot holes 22 arranged on the surface of each rotor pole 12 is two, that is, two slot holes 22 are arranged in one magnetic pole. The two slot holes 22 are respectively located at the two ends of the rotor pole 12, and the slot holes 22 are located between the magnetic isolation bridges 18 on both sides and are symmetrically distributed along the second line segment S2. The length L2 of the line connecting the center points of the two slot holes 22 ranges from 1:1.18 to 1:1.45 with respect to the length L3 of the magnetic pole slot 24, so that the sine degree of the motor air gap magnetic flux density is further optimized, and the cogging torque is reduced. In addition, the two slot holes 22 on each rotor pole 12 can also be asymmetrically distributed, as long as the included angle A ranges, so that the sine degree of the motor air gap magnetic flux density is optimized and the cogging torque is reduced. The shape of the slot hole 22 is a waist-shaped hole, but the present application is not limited thereto, and the slot hole 22 can also be triangular, circular, square or polygonal, or other shapes.

[0040] Please refer to Figure 4 and Figure 5 , Figure 4 is a structural schematic diagram of a magnetic circuit topology structure 1 of a permanent magnet motor provided by an embodiment of the present application, Figure 5 is a structural schematic diagram of the stator tooth 32. In order to achieve at least one of the advantages or other advantages, an embodiment of the present application provides a magnetic circuit topology structure 1 of a permanent magnet motor. As shown in the figure, the magnetic circuit topology structure 1 of the permanent magnet motor comprises a stator lamination 30 and the rotor lamination 10 described in the foregoing embodiments. The specific structure and technical effects of the rotor lamination 10 will not be described in detail.

[0041] The stator lamination 30 is sleeved on the outer edge of the rotor lamination 10, and the 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 lamination 30 includes a plurality of stator teeth 32 uniformly distributed in the circumferential direction, and each stator tooth 32 has an arc-shaped portion 34 and a cut portion 36. The arc-shaped portion 34 is connected to the cut portion 36 at both ends in the circumferential direction, that is, the left and right ends of the arc-shaped portion 34 are connected to the cut portion 36.

[0042] As shown in Figure 5 , the ratio of the central angle B of the arc-shaped portion 34 to the angle C of the stator tooth 32 is in the range of 1:1.1 to 1:1.9. The angle C of the stator tooth 32 refers to the angle between the most distant endpoints of the left and right cut portions 36, and the left end of the angle C of the stator tooth 32 is parallel to the left end of the central angle B of the arc-shaped portion 34, and the right end of the angle C of the stator tooth 32 is parallel to the right end of the central angle B of the arc-shaped portion 34. Preferably, the ratio of the length L4 of the side of the cut portion 36 to the length L5 of the side of the stator tooth 32 before cutting is in the range of 1:1.85 to 1:1.9. The length L5 of the side of the stator tooth 32 before cutting refers to the distance between the intersection point of the extension line of the side of the cut portion 36 toward the shaft hole 14 and the arc extension line of the arc-shaped portion 34 and the starting point of the side of the cut portion 36, and the most distant point from the intersection point on the side of the cut portion 36 is the starting point, that is Figure 5 , the upper endpoint. By the above ratio range, the rotor core surface magnetic density distribution tends to be uniform, the overall combined magnetic circuit structure can effectively improve the magnetic conductance and magnetic motive force at the air gap 40, optimize the motor air gap 40 magnetic density sine degree, reduce the risk of permanent magnet demagnetization, and reduce the cogging torque, so as to reduce the torque fluctuation, weaken the noise and vibration of the motor.

[0043] In summary, an advantage of the present application is to provide a rotor lamination 10 and a permanent magnet motor magnetic circuit topology 1, by optimizing the design of the outer side of the rotor pole 12, so that a non-uniform air gap 40 is formed between the rotor lamination 10 and the stator lamination 30. The non-uniform air gap 40 can greatly reduce the harmonic content of the air gap 40 magnetic field, realize the sinusoidalization of the back electromotive force and the air gap 40 magnetic density, reduce the influence of the permanent magnet motor cogging torque and each harmonic on the motor, and further reduce the torque ripple, the noise and vibration of the motor. Moreover, since the first arc-shaped side 121 and the third arc-shaped side 123 are eccentrically arranged, the magnetic density change trend is relatively moderate, thereby the motor output torque is not weakened too much, and the motor output torque is ensured.

[0044] Another advantage of the present application is to provide a rotor lamination 10 and a permanent magnet motor magnetic circuit topology 1, by setting the length of the magnetic isolation bridge 18, the leakage magnetic of the permanent magnet can be reduced, and the leakage magnetic coefficient can be reduced.

[0045] Another advantage of the present application is to provide a rotor lamination 10 and a permanent magnet motor magnetic circuit topology 1, by setting the slot hole 22 on the surface of the rotor pole 12, the sinusoidal degree of the motor air gap 40 magnetic density can be optimized, and the cogging torque can be reduced.

[0046] Another advantage of the present application is to provide a rotor lamination 10 and a permanent magnet motor magnetic circuit topology 1, by setting the stress slot 20, the local magnetic resistance can be increased, the penetration of the harmonic to the permanent magnet can be reduced, and the demagnetization working point of the permanent magnet can be increased.

[0047] Another advantage of the present application is to provide a rotor lamination 10 and a permanent magnet motor magnetic circuit topology 1, by setting the arc-shaped part 34 and the cutting part 36 on the stator tooth 32, the rotor core surface magnetic density distribution tends to be uniform, the overall combined magnetic circuit structure can effectively improve the magnetic permeance and the magnetic motive force at the air gap 40, the sinusoidal degree of the motor air gap 40 magnetic density can be optimized, the demagnetization risk of the permanent magnet and the cogging torque can be reduced, so as to reduce the torque fluctuation and weaken the noise and vibration of the motor.

[0048] In addition, those skilled in the art should understand that although there are many problems in the prior art, each embodiment or technical solution of the present application can only be improved in one or several aspects, and it is not necessary to solve all the technical problems listed in the prior art or background art at the same time. Those skilled in the art should understand that what is not mentioned in a claim should not be regarded as a limitation of the claim.

[0049] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotor lamination, characterized by The rotor lamination comprises: a plurality of rotor poles distributed in the circumferential direction and connected to each other, each of the rotor poles comprises a first arc-shaped side, a second arc-shaped side and a third arc-shaped side, two ends of the second arc-shaped side are connected to the first arc-shaped side and the third arc-shaped side respectively, the center of the first arc-shaped side and the center of the third arc-shaped side are offset from the center of the second arc-shaped side; and a shaft hole located at the center of the rotor lamination, the center of the second arc-shaped side coincides with the center of the shaft hole. The ratio of the second arc-shaped side to the pole arc is in the range of 1:2.24-1:2.32; the radius of curvature of the first arc-shaped side is equal to the radius of curvature of the third arc-shaped side, the ratio of the radius of curvature of the first arc-shaped side to the radius of curvature of the second arc-shaped side is in the range of 1:4-1:4.15; the surface of each of the rotor poles is provided with a slot hole, the line segment connecting the center point of the slot hole and the center point of the shaft hole is defined as a first line segment, the line segment connecting the midpoint of the second arc-shaped side and the center point of the shaft hole is defined as a second line segment, the included angle between the first line segment and the second line segment is in the range of 12°-16°; the number of slot holes provided on the surface of each of the rotor poles is two, which are located at the two ends of the rotor pole respectively, the ratio of the length of the line segment connecting the center points of the two slot holes to the length of the magnet slot is in the range of 1:1.18-1:1.

45.

2. The rotor lamination of claim 1, wherein: The surface of each of the rotor poles facing the shaft hole is provided with a magnet slot, and each of the rotor poles further comprises a magnetic isolation bridge, which is located on both sides of the magnet slot, the ratio of the length of the magnetic isolation bridge to the thickness of the magnet slot is in the range of 1:1.08-1:1.

12.

3. The rotor lamination of claim 2, wherein: Each of the rotor poles further comprises a stress slot located at the corner of the magnet slot.

4. A magnetic circuit topology for a permanent magnet electric machine, characterized by, The magnetic circuit topology of the permanent magnet motor comprises: The rotor lamination according to any one of claims 1-3; and A stator lamination sleeved on the outer edge of the rotor lamination and forming an air gap with the rotor lamination.

5. The magnetic circuit topology of a permanent magnet electric machine according to claim 4, characterized in that: The stator lamination comprises a plurality of stator teeth uniformly distributed in the circumferential direction, each of the stator teeth has an arc-shaped part and a cutting part, the two ends of the arc-shaped part in the circumferential direction are connected to the cutting part, the ratio of the central angle of the arc-shaped part to the angle of the stator tooth is in the range of 1:1.1-1:1.

9.

6. The magnetic circuit topology of a permanent magnet electric machine according to claim 4, characterized in that: The ratio of the length of the side of the cutting part to the length of the side of the stator tooth before cutting is in the range of 1:1.85-1:1.9.

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