CN209896886U

CN209896886U - Motor with a stator having a stator core

Info

Publication number: CN209896886U
Application number: CN201921000083.9U
Authority: CN
Inventors: 萧家祥; 林继谦
Original assignee: A Data Technology Co Ltd
Current assignee: A Data Technology Co Ltd
Priority date: 2019-06-04
Filing date: 2019-06-28
Publication date: 2020-01-03
Anticipated expiration: 2029-06-28
Also published as: JP3224307U; TWM585453U

Abstract

The utility model discloses a motor, it contains inner rotor, a plurality of permanent magnet and outer stator. The inner rotor contains a plurality of rotor lamellar bodies, and each rotor lamellar body contains central shaft hole and a plurality of perforation group, and each perforation group contains two magnet holding holes. Each magnet accommodating hole is used for arranging a permanent magnet. When the permanent magnet is arranged in the magnet containing hole, the magnet containing hole is divided into two separation holes, the two separation holes are correspondingly positioned at two ends of the permanent magnet, and the sectional area of the separation hole adjacent to the outer edge of the rotor sheet body is larger than that of the separation hole adjacent to the center of the rotor sheet body. The outer stator comprises a plurality of stator sheets. The inner rotor is disposed in the outer stator. The problem of internal magnetic force consumption of the motor can be greatly reduced through the design of the isolation hole.

Description

Motor with a stator having a stator core

Technical Field

The utility model relates to a motor, especially a permanent magnet motor.

Background

For designers of permanent magnet motors, how to reduce the internal loss between two magnets in the motor is one of the most important problems to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a motor mainly is used for improving easy mutual interference between the permanent magnet of the inside that current motor exists, and takes place the problem of magnetic force internal loss easily.

An embodiment of the present invention provides a motor, which includes: an inner rotor, a plurality of permanent magnets and an outer stator. The inner rotor comprises a plurality of rotor sheet bodies, each rotor sheet body comprises a central shaft hole and a plurality of groups of through hole groups, each group of through hole group is provided with two magnet containing holes, each magnet containing hole penetrates through the rotor sheet body, the magnet containing holes are not mutually communicated, and the two magnet containing holes of each group of through hole group are symmetrically formed in the rotor sheet body by taking a symmetric shaft as the center; the plurality of rotor sheet bodies are stacked and fixedly arranged, the magnet accommodating holes of the plurality of rotor sheet bodies jointly form a magnet accommodating channel along an axial direction, and the central shaft holes jointly form a shaft body accommodating channel along the axial direction. The permanent magnets are arranged in the magnet accommodating channels; when each permanent magnet is fixedly arranged in one of the magnet containing holes, the magnet containing hole is divided into two isolating holes by the permanent magnet, and the two isolating holes are correspondingly positioned at the two ends of the permanent magnet; two permanent magnets inserted into two magnet-receiving holes of each group of through holes have the same magnetic properties on the side facing the axis of symmetry. The outer stator comprises a plurality of stator sheet bodies, each stator sheet body comprises an annular part, a plurality of tooth parts and a plurality of shoe parts, the tooth parts extend from the annular part to the center of the outer stator, the tooth parts are arranged at intervals, and each tooth part extends to the center of the outer stator to form one shoe part; each tooth is wound with a coil.

Preferably, each magnet accommodating hole is composed of a rectangular hole, an inner triangular hole and an outer triangular hole, each rectangular hole is used for the permanent magnet to penetrate through, and two isolation holes formed by being separated by the permanent magnet are the inner triangular hole and the outer triangular hole respectively; the inner triangular hole is arranged near the center of the rotor sheet body, and the outer triangular hole is arranged near the outer edge of the rotor sheet body; the maximum width of each outer triangular hole is greater than the width of each rectangular hole.

Preferably, two long sides of the rectangular hole of each magnet containing hole opposite to each other are respectively defined as a first long side and a second long side, two sides of the inner triangular hole of each magnet containing hole are respectively defined as a first inner side and a second inner side, three sides of the outer triangular hole of each magnet containing hole are respectively defined as a bottom side, a first outer side and a second outer side, one end of the first long side is connected with one end of the first inner side, the other end of the first long side is connected with the first outer side, one end of the second long side is connected with one end of the second inner side, the other end of the second long side is connected with the bottom side, the two ends of the second outer side edge are correspondingly connected with one end of the bottom edge and one end of the first outer side edge, and each outer triangular hole is formed by extending each rectangular hole in the direction far away from the center of the rotor sheet body and the direction close to the symmetry axis.

Preferably, an outer edge of each rotor sheet body defines a plurality of convex sections and a plurality of flat sections, the convex sections and the flat sections are arranged at intervals, and any flat section is located between two convex sections; the distance from the center of the rotor sheet body to the outer edge of the convex section of the rotor sheet body is larger than the distance from the center of the rotor sheet body to the outer edge of the gentle section of the rotor sheet body.

Preferably, the outer triangular holes of two adjacent magnet accommodating holes belonging to different perforation groups are correspondingly positioned on the inner side of the outer edge of the rotor sheet body in the gentle section.

Preferably, the included angle between the central axis of each rectangular hole in the same group of perforation groups and the symmetry axis is between 20 degrees and 80 degrees; two magnet containing holes adjacent to each other belonging to different perforation groups are arranged symmetrically to each other.

Preferably, the distance between the two magnet containing holes of each group of through holes gradually expands from the position adjacent to the center of the rotor sheet body along the direction away from the center of the rotor sheet body; the distance between two adjacent magnet containing holes belonging to different perforation groups is gradually reduced from the position adjacent to the center of the rotor sheet body along the direction far away from the center of the rotor sheet body.

Preferably, two outer triangular holes adjacent to each other belonging to different perforation groups are formed with a partition having a width of not less than 0.7 mm therebetween.

Preferably, a partition part is formed between the two inner triangular holes of each group of perforation groups, and the width of the partition part is not less than 0.7 mm.

Preferably, a fixing hole is further formed between the two magnet containing holes of each group of through holes, the fixing hole is rectangular, each fixing hole is used for providing a fixing piece to be inserted, and the plurality of rotor sheets are mutually fixed through the plurality of fixing pieces; wherein the symmetry axis overlaps with the central axis of the fixing hole, or the symmetry axis is parallel with the central axis of the fixing hole.

To sum up, the utility model discloses a motor is greater than the design of magnet through making each magnet holding hole, and when making each magnet set up in magnet holding hole, magnet holding hole can be separated out two isolation holes by the district. The design of the isolation hole can greatly reduce the problem of magnetic interference of the adjacent magnets, thereby reducing the problem of internal loss between the magnets in the motor.

For a further understanding of the features and technical content of the present invention, reference should be made to the following detailed description and accompanying drawings, which are only intended to illustrate the present invention, and not to limit the scope of the present invention.

Drawings

Fig. 1 is a perspective view of a motor according to the present invention.

Fig. 2 is an exploded view of the motor of the present invention.

Fig. 3 is an exploded view of the inner rotor and part of the magnets of the motor according to the present invention.

Fig. 4 is a schematic end view of an inner rotor of the motor of the present invention.

Fig. 5 is a partially enlarged schematic view of fig. 4.

Fig. 6 is a schematic end view of the inner rotor and the outer stator of the motor according to the present invention.

Fig. 7 is a partially enlarged schematic view of fig. 6.

Fig. 8 is a schematic view of a partial magnetic circuit of the motor of the present invention.

Detailed Description

In the following description, reference is made to or shown in the accompanying drawings for the purpose of illustrating the general principles of the invention, and not by way of limitation, it is intended that all matter contained in the following description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Referring to fig. 1 to 3, fig. 1 and 2 are three-dimensional assembly and exploded schematic views of a motor according to the present invention, and fig. 3 is a partial exploded schematic view of an inner rotor and a permanent magnet of the motor according to the present invention. The motor 100 of the present invention includes an inner rotor 1, a plurality of permanent magnets 2, and an outer stator 3. Hereinafter, the difference between the motor 100 of the present invention and the conventional motor (especially, reluctance motor) will be mainly described, but the control method of the motor 100 of the present invention is substantially the same as that of the conventional motor, and will not be described again.

The inner rotor 1 is formed by stacking and fixing a plurality of rotor sheets 10, the outer stator 3 is formed by stacking and fixing a plurality of stator sheets 30, an accommodating channel 30A (as shown in fig. 2) is formed at the center of the outer stator 3, and the inner rotor 1 is correspondingly arranged in the accommodating channel 30A. The inner rotor 1 includes a plurality of magnet receiving passages 121A (shown in fig. 3) and a shaft receiving passage 11A (shown in fig. 3), a plurality of permanent magnets 2 are correspondingly and fixedly disposed in the plurality of magnet receiving passages 121A, and a rotating shaft (not shown) of the motor 100 is correspondingly disposed in the shaft receiving passage 11A.

In the present embodiment, a plurality of permanent magnets 2 are disposed in a single magnet receiving passage 121A, but the number of permanent magnets 2 disposed in the single magnet receiving passage 121A is not limited to that shown in the drawings, and in a special application, the single magnet receiving passage 121A may be disposed with only a single permanent magnet 2. In a specific implementation, the permanent magnet 2 may be fixed to the plurality of rotor sheets 10 by an adhesive, or the permanent magnet 2 may be directly fixed in the magnet accommodating passage 121A in a clamping manner.

Referring to fig. 3 to 6 together, fig. 4 is a schematic end view of a rotor plate of the motor of the present invention, fig. 5 is a partial enlarged view of fig. 4, and fig. 6 is a schematic end view of an inner rotor and an outer stator of the motor of the present invention. Each rotor plate 10 includes a central shaft hole 11, a plurality of sets of through holes 12 and a plurality of fixing holes 13. In practical applications, the rotor sheet body 10 may be, for example, a silicon steel sheet, but not limited thereto. Each set of through-holes 12 has two magnet receiving holes 121. The respective magnet containing holes 121 penetrate the rotor sheet body 10, and the respective magnet containing holes 121 do not communicate with each other. The two magnet accommodating holes 121 of each set of through-hole groups 12 are formed in the rotor sheet body 10 symmetrically with respect to each other about an axis of symmetry AX1 (shown in fig. 5). In the drawings of the present embodiment, the rotor sheet 10 has 8 sets of through hole sets 12 as an example, but the number of the through hole sets 12 is not limited thereto, and can be increased or decreased according to the requirement.

The magnet receiving holes 121 of the plurality of rotor sheets 10 collectively form one magnet receiving passage 121A (shown in fig. 3) in an axial direction (X-axis direction of the coordinates shown in fig. 3), and the central shaft holes 11 collectively form a shaft body receiving passage 11A (shown in fig. 3) in the axial direction. The shape of the central shaft hole 11 may be determined according to the shape of the actual rotating shaft, and is shown as an exemplary aspect. In practical applications, the number of the rotor sheets 10, the length of the magnet accommodating channel 121A in the axial direction, and the length of the shaft accommodating channel 11A in the axial direction may be varied according to requirements, and are not limited thereto.

The fixing holes 13 may be used to provide a plurality of fixing members (e.g., rivets) to pass through, and the plurality of rotor sheets 10 may be stacked and fixed to each other by the plurality of fixing members. Each fixing hole 13 may be disposed between two magnet accommodating holes 121 of each through hole group 12, and the fixing hole 13 may be rectangular, and the central axis of the fixing hole 13 may overlap with the symmetry axis AX1 (or the central axis of the fixing hole 13 may be parallel to the symmetry axis AX 1), so that the fixing hole 13 and the fixing member disposed therein will not interfere with the magnetic circuit of the entire motor too much.

As shown in fig. 5, each magnet receiving hole 121 may be composed of a rectangular hole 1211, an inner triangular hole 1212, and an outer triangular hole 1213. The rectangular hole 1211 is used for the permanent magnet 2 to pass through, and the cross-sectional shape and the cross-sectional size of the rectangular hole 1211 on the wide side of the rotor sheet 10 substantially correspond to the cross-sectional shape and the cross-sectional size of the permanent magnet 2 on the wide side of the rotor sheet 10, and the permanent magnet 2 can be fixedly disposed in the rectangular hole 1211 (as shown in fig. 6).

In other words, as shown in fig. 6, when the permanent magnet 2 is disposed in the magnet accommodating hole 121, the permanent magnet 2 is disposed in the rectangular hole 1211, and the magnet accommodating hole 121 is separated by the permanent magnet 2 into two separated holes, namely, the inner triangular hole 1212 and the outer triangular hole 1213; that is, when each permanent magnet 2 is disposed in the magnet accommodating hole 121, the magnet accommodating hole 121 is not filled with the permanent magnet 2, and two isolation holes not filled with the permanent magnet 2 are formed at both ends of the magnet accommodating hole 121 of the permanent magnet 2.

As shown in fig. 4 and 5, the inner triangular hole 1212 of each through hole group 12 is disposed near the center C of the rotor blade body 10, and the outer triangular hole 1213 is disposed near the outer edge of the rotor blade body 10. The cross-sectional area of each outer triangular hole 1213 on the wide side of the rotor blade body 10 is larger than the cross-sectional area of each inner triangular hole 1212 on the wide side of the rotor blade body 10, and the maximum width W1 (shown in fig. 5) of each outer triangular hole 1213 is larger than the width W2 (shown in fig. 5) of each rectangular hole 1211. In practical applications, the maximum width W1 of the outer triangular holes 1213 may be 0.5 to 2.0 times the width W2 of the rectangular holes 1211.

In more detail, as shown in fig. 5, in the specific application, two long sides of each rectangular aperture 1211 opposite to each other are respectively defined as a first long side 1211A and a second long side 1211B; two sides of the inner triangular hole 1212 are respectively defined as a first inner side edge 1212A and a second inner side edge 1212B; three sides of the outer triangular hole 1213 are respectively defined as a bottom edge 1213A, a first outer side edge 1213B and a second outer side edge 1213C.

One end of the first long side 1211A is connected to one end of the first inner side 1212A, the other end of the first long side 1211A is connected to the first outer side 1213B, one end of the second long side 1211B is connected to one end of the second inner side 1212B, the other end of the second long side 1211B is connected to the bottom 1213A, and two ends of the second outer side 1213C are correspondingly connected to one end of the bottom 1213A and one end of the first outer side 1213B.

In other words, one vertex V1 of the inner triangular hole 1212 of each magnet containing hole 121 is connected to the first long side 1211A, and the other vertex V2 of the inner triangular hole 1212 is connected to the second long side 1211B; one vertex V3 of the outer triangular hole 1213 of each magnet containing hole 121 is connected to the other end of the first long side 1211A, and one end of the bottom edge 1213A of the outer triangular hole 1213 is connected to the second long side 1211B.

As described above, in brief, the outer triangular hole 1213 of the present embodiment is formed by extending one end of the rectangular hole 1211 in a direction away from the center of the rotor sheet 10 and in a direction toward the axis of symmetry AX 1.

In a specific embodiment, the length of first long side 1211A may be 9 mm, the length of second long side 1211B may be 9 mm, the length of first inner side edge 1212A may be 1.5 mm, the length of second inner side edge 1212B may be 2.6 mm, the length of base edge 1213A may be 1.82 mm, the length of first outer side edge 1213B may be 3.24 mm, and the length of second outer side edge 1213C may be 3.82 mm.

In practical applications, the two first inner side edges 1212A of the same perforation group 12 may be arranged parallel to each other; the first and second inner side edges 1212A and 1212B of each magnet receiving hole 121 may be disposed perpendicular to each other; the bottom edge 1213A and the second long side 1211B of each magnet containing hole 121 may be disposed perpendicular to each other; the angle θ between the central axis AX3 of each rectangular hole 1211 and the axis of symmetry AX1 in the same through hole group 12 may be 20 degrees to 80 degrees, and the distance between the two magnet-containing holes 121 of each through hole group 12 gradually increases from a position adjacent to the center C of the rotor sheet 10 to a position away from the center C of the rotor sheet 10.

In practical applications, the two adjacent magnet accommodating holes 121 belonging to different through hole groups 12 may be symmetrically formed on the rotor sheet 10 around the other symmetry axis AX2, and the distance between the two adjacent magnet accommodating holes 121 belonging to different through hole groups 12 gradually decreases from the position adjacent to the center C of the rotor sheet 10 in the direction away from the center C of the rotor sheet 10. Wherein two first outer lateral sides 1213B adjacent to each other belonging to different perforation groups 12 may be arranged parallel to each other.

Specifically, in the present embodiment, the two isolation holes (i.e., the inner triangular hole 1212 and the outer triangular hole 1213) separated by the permanent magnet 2 are all triangular in shape, but the shape of each isolation hole (i.e., the inner triangular hole 1212 and the outer triangular hole 1213) is not limited thereto. The shape of each isolation hole (i.e., the inner triangular hole 1212 and the outer triangular hole 1213) may also be varied according to requirements.

Referring to fig. 1, fig. 6 and fig. 7 together, fig. 7 is a partially enlarged schematic view of fig. 6. Each stator sheet 30 includes a ring portion 301, a plurality of tooth portions 302, and a plurality of shoe portions 303. The inner edge of the annular portion 301 extends toward the center of the stator sheet 30 to form a plurality of teeth 302, and each tooth 302 extends toward the center of the stator sheet 30 to form a single shoe 303. The side of each shoe 303 opposite to the side connected to the tooth 302 may be arc-shaped. When the inner rotor 1 is disposed in the outer stator 3, each of the shoes 303 faces the outer edge of the rotor sheet 10. Each tooth portion 302 is wound with a coil S. In practical applications, the number of coils S wound in the outer stator 3 and which teeth 302 each coil S is wound around may be varied according to requirements, and is not limited thereto.

Referring to fig. 4 again, in practical applications, an outer edge 101 of each rotor sheet 10 defines a plurality of convex sections 10A and a plurality of flat sections 10B. The plurality of convex sections 10A and the plurality of gentle sections 10B are disposed at intervals, and any one gentle section 10B is correspondingly located between two convex sections 10A. The distance L1 from the center C of the rotor sheet 10 to the outer edge of the rotor sheet 10 at the convex section 10A is greater than the distance L2 from the center C of the rotor sheet 10 to the outer edge of the rotor sheet 10 at the gentle section 10B. The number of the convex sections 10A and the gentle sections 10B may correspond to the number of the perforation sets 12, but is not limited thereto.

In practical applications, each protruding section 10A is located outside the middle of two magnet-receiving holes 121 of one set of through holes 12, and each flat section 10B is located outside the outer triangular holes 1213 of two different sets of through holes 12. That is, the outer triangular holes 1213 of the two magnet accommodating holes 121 adjacent to each other of the through-hole groups 12 belonging to different groups are located correspondingly inside the outer edge of the rotor sheet body 10 at the gentle section 10B.

As shown in fig. 7, by the design of the convex section 10A and the gentle sections 10B, when the convex section 10A and the gentle sections 10B face one of the boots 303 at the same time, the gap P1 between the boot 303 and the convex section 10A is smaller than the gap P2 between the boot 303 and the other two gentle sections 10B. By designing the convex section 10A and the gentle section 10B, the gap between the outer edge of the rotor sheet 10 and the shoe 303 can be shortened when two permanent magnets 2 in the same group of through holes 12 substantially face one of the shoes 303.

As shown in fig. 3 and 7, the two permanent magnets 2 disposed in the two magnet accommodating holes 121 of each set of through-holes 12 have the same magnetic properties on the one side surface 21 facing the axis of symmetry AX1, and the magnetic properties on the one side surface 21 facing the two permanent magnets 2 of the same set of through-holes 12 are different from the magnetic properties on the side facing the two permanent magnets 2 of the other adjacent set of through-holes 12. Specifically, as shown in fig. 7, assuming that the magnetic properties of one side surface 21, facing each other, of two permanent magnets 2 located in the same through-hole group 12 located at the center of the drawing are S-poles, the magnetic properties of one side surface 21, facing each other, of two permanent magnets 2 located in the same through-hole group 12 located on the right side (or left side) of the drawing are N-poles.

Referring to fig. 7 and 8, fig. 8 is a schematic view showing a magnetic circuit simulation of the motor of the present invention. As shown in the figure, by the design of the convex section 10A and the gentle section 10B and the design of making the magnetic property of the side surface 21 facing the two permanent magnets 2 in the same through hole group 12 the magnetic force lines between the shoe 303 and the two permanent magnets 2 in the same through hole group 12 can be made denser, and the inner rotor 1 can be rotated more efficiently with respect to the outer stator 3.

By designing the outer triangular holes 1213, magnetic lines of force between two adjacent permanent magnets 2 disposed in different perforation groups 12 can be relatively loosened, and magnetic force consumption between the permanent magnets 2 disposed in different perforation groups 12, that is, the problem of internal magnetic force consumption of the inner rotor 1 can be greatly reduced. In addition, in practical applications, a separation portion 102 is formed between two outer triangular holes 1213 adjacent to each other belonging to different through-hole groups 12, and the width of the separation portion 102 is not less than 0.7 mm, whereby the separation portion 102 is easily magnetically saturated, and it is possible to further enhance and reduce the magnetic force consumption between the permanent magnets 2 in different through-hole groups 12.

Similarly, by designing the inner triangular hole 1212, the magnetic force lines between the two permanent magnets 2 disposed in the same perforation group 12 are also relatively loose, so that the magnetic force consumption between the two permanent magnets 2 disposed in the same perforation group 12 can be greatly reduced, that is, the problem of the magnetic force internal consumption of the inner rotor 1 can be greatly reduced. In addition, in practical applications, a separation portion 103 may be formed between the two inner triangular holes 1212 of each through hole set 12, and the width of the separation portion 103 is not less than 0.7 mm, so that the separation portion 103 is easily saturated magnetically, and the magnetic force consumption between the two permanent magnets 2 in the same through hole set 12 can be further reduced.

To sum up, the utility model discloses a motor through the design of isolation hole (upload promptly interior triangle hole reaches three outer triangle holes), will reduce the problem of consuming in the magnetic force between the inside permanent magnet of motor by a wide margin to can promote the holistic operating efficiency of motor.

The above only is the feasible embodiment of preferred of the utility model, therefore not limit the patent scope of the utility model, the event holds the application the equivalent technical change that the content of the description and the attached drawing was done all contains in the protection scope of the utility model.

Claims

1. A motor, comprising:

an inner rotor including a plurality of rotor sheets, each of the rotor sheets including a central shaft hole and a plurality of sets of through holes, each set of the through holes having two magnet receiving holes, each of the magnet receiving holes penetrating the rotor sheet, each of the magnet receiving holes not being communicated with each other, the two magnet receiving holes of each set of the through holes being formed in the rotor sheet symmetrically about a symmetry axis; the plurality of rotor sheet bodies are mutually stacked and fixedly arranged, the magnet containing holes of the plurality of rotor sheet bodies, which correspond to each other, jointly form a magnet containing channel along an axial direction, and the central shaft holes of the plurality of rotor sheet bodies, which correspond to each other, jointly form a shaft body containing channel along the axial direction;

a plurality of permanent magnets disposed in the plurality of magnet receiving channels; each permanent magnet is fixedly arranged in one of the magnet containing holes, the magnet containing holes are separated into two isolating holes by the permanent magnets, the two isolating holes are correspondingly positioned at two ends of the permanent magnets, and the cross-sectional area of the isolating holes adjacent to the outer edge of the rotor sheet body is larger than that of the isolating holes adjacent to the center of the rotor sheet body; two of the permanent magnets, which are inserted into two of the magnet accommodating holes of each of the through-hole groups and have the same magnetism on the side facing the axis of symmetry; and

an outer stator, comprising a plurality of stator sheets, each stator sheet comprising an annular portion, a plurality of teeth and a plurality of shoes, the teeth being formed by the annular portion extending in a direction toward a center of the outer stator, the teeth being spaced apart from each other, and each tooth extending in a direction toward the center of the outer stator to form one of the shoes; each of the teeth is wound with a coil.

2. The motor as claimed in claim 1, wherein each of said magnet receiving holes is composed of a rectangular hole, an inner triangular hole and an outer triangular hole, each of said rectangular holes is used for passing said permanent magnet therethrough, and two of said isolation holes formed by being partitioned by said permanent magnet are said inner triangular hole and said outer triangular hole, respectively; the inner triangular hole is arranged close to the center of the rotor sheet body, and the outer triangular hole is arranged close to the outer edge of the rotor sheet body; the maximum width of each outer triangular hole is larger than the width of each rectangular hole.

3. The motor as claimed in claim 2, wherein two long sides of the rectangular hole of each of the magnet receiving holes, which are opposite to each other, are respectively defined as a first long side and a second long side, two sides of the inner triangular hole of each of the magnet receiving holes are respectively defined as a first inner side and a second inner side, three sides of the outer triangular hole of each of the magnet receiving holes are respectively defined as a base, a first outer side and a second outer side, one end of the first long side is connected to one end of the first inner side, the other end of the first long side is connected to the first outer side, one end of the second long side is connected to one end of the second inner side, the other end of the second long side is connected to the base, and the two ends of the second outer side are correspondingly connected to one end of the base and one end of the first outer side, and each outer triangular hole is formed by extending each rectangular hole in a direction away from the center of the rotor sheet body and a direction close to the symmetry axis.

4. The motor of claim 2, wherein an outer edge of each of the rotor sheets defines a plurality of convex sections and a plurality of flat sections, the plurality of convex sections and the plurality of flat sections being spaced apart from each other, and any one of the flat sections being located between two of the convex sections; the distance from the center of the rotor sheet body to the outer edge of the rotor sheet body in the convex section is larger than the distance from the center of the rotor sheet body to the outer edge of the rotor sheet body in the gentle section.

5. The motor according to claim 4, wherein the outer triangular holes of two of the magnet containing holes adjacent to each other belonging to different groups of the through holes are located correspondingly inside the outer edges of the rotor sheet at the gentle sections.

6. The motor of claim 5, wherein the central axis of each rectangular hole in the same set of through holes is at an angle of 20 to 80 degrees with respect to the symmetry axis; two of the magnet accommodating holes adjacent to each other belonging to different sets of the through holes are disposed symmetrically to each other.

7. The motor according to claim 6, wherein the distance between the two magnet containing holes of each group of the through-hole groups is gradually enlarged from a position adjacent to the center of the rotor sheet body in a direction away from the center of the rotor sheet body; the distance between two adjacent magnet containing holes belonging to different perforation groups is gradually reduced from the position adjacent to the center of the rotor sheet body along the direction away from the center of the rotor sheet body.

8. The motor as claimed in claim 6, wherein two of the outer triangular holes adjacent to each other belonging to different perforation groups are formed with a partition having a width of not less than 0.7 mm therebetween.

9. The motor as claimed in claim 6, wherein a partition is formed between two inner triangular holes of each group of the through holes, and the width of the partition is not less than 0.7 mm.

10. The motor of claim 2, wherein a fixing hole is further formed between two of said magnet receiving holes of each of said through hole groups, said fixing hole is rectangular, each of said fixing holes is used for providing a fixing member to be inserted therein, and a plurality of said rotor sheets are fixed to each other by a plurality of said fixing members; wherein the symmetry axis overlaps with a central axis of the fixing hole, or the symmetry axis is parallel to the central axis of the fixing hole.