CN209896886U - Motor with a stator having a stator core - Google Patents

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

technical field

The utility model relates to a motor, in particular to a permanent magnet motor.

Background technique

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

Utility model content

The utility model discloses a motor, which is mainly used for improving the problem that the existing permanent magnets in the existing motor are easy to interfere with each other and cause internal friction of magnetic force.

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 includes a plurality of rotor pieces, each rotor piece includes a central axis hole and a plurality of sets of perforation groups, each group of perforation groups has two magnet accommodating holes, each magnet accommodating hole penetrates the rotor piece body, and each magnet accommodates The holes are not communicated with each other, and the two magnet accommodating holes of each group of perforation groups are symmetrically formed on the rotor piece with a symmetry axis as the center; a plurality of rotor pieces are stacked and fixed to each other, and each The magnet accommodating holes together form a magnet accommodating channel along an axial direction, and each central shaft hole jointly forms a shaft body accommodating channel along the axial direction. A plurality of permanent magnets are arranged in a plurality of magnet accommodating channels; when each permanent magnet is fixedly arranged in one of the magnet accommodating holes, the magnet accommodating hole is divided by the permanent magnet into two isolation holes, and the two isolation holes correspond to The two permanent magnets are located at both ends of the permanent magnet; the two permanent magnets which are inserted into the two magnet accommodating holes of each perforated group have the same magnetism on the side facing the axis of symmetry. The outer stator includes a plurality of stator sheet bodies, each stator sheet body includes an annular portion, a plurality of tooth portions and a plurality of shoe portions, the plurality of tooth portions are formed by extending from the annular portion towards the center of the outer stator, and the plurality of tooth portions are formed. The tooth portions are arranged at intervals from each other, and each tooth portion is formed with a shoe portion extending in the direction of the center of the outer stator; and each tooth portion 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 to provide permanent magnets to pass through, and the two isolation holes formed by the permanent magnets are respectively The inner triangular hole and the outer triangular hole are arranged; the inner triangular hole is arranged adjacent to the center of the rotor body, and the outer triangular hole is arranged near the outer edge of the rotor body; the maximum width of each outer triangular hole is larger than the width of each rectangular hole.

Preferably, the two opposite long sides of the rectangular hole of each magnet accommodating hole are respectively defined as a first long side and a second long side, and the two sides of the inner triangular hole of each magnet accommodating hole are respectively defined as a first long side and a second long side. Defined as a first inner side and a second inner side, the three sides of the outer triangular hole of each magnet accommodating 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, and 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 to the bottom side, and the two ends of the second outer side are connected to one end of the bottom side and one end of the first outer side, and each outer triangular hole is a rectangular hole formed by It is formed to extend in a direction away from the center of the rotor piece body and in a direction close to the axis of symmetry.

Preferably, an outer edge of each rotor piece defines a plurality of protruding sections and a plurality of flat sections, the plurality of protruding sections and the plurality of flat sections are spaced apart from each other, and any flat section is located at Between the two protruding sections; the distance from the center of the rotor piece to the outer edge of the rotor piece at the protruding section is greater than the distance from the center of the rotor piece to the outer edge of the rotor piece at the flat section.

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

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

Preferably, the distance between the two magnet accommodating holes of each group of perforation groups gradually increases from the position adjacent to the center of the rotor sheet body in the direction away from the center of the rotor sheet body; those belonging to different perforation groups are adjacent to each other. The distance between the two magnet accommodating holes is gradually reduced from the position adjacent to the center of the rotor piece along the direction away from the center of the rotor piece.

Preferably, an isolation portion is formed between two adjacent outer triangular holes belonging to different perforation groups, and the width of the isolation portion is not less than 0.7 mm.

Preferably, an isolation portion is formed between the two inner triangular holes of each perforation group, and the width of the isolation portion is not less than 0.7 mm.

Preferably, there is also a fixing hole between the two magnet accommodating holes of each group of perforation groups, the fixing hole is rectangular, each fixing hole is used to provide a fixing piece to be inserted, and the plurality of rotor pieces pass through the plurality of fixing pieces They are fixed to each other; wherein the axis of symmetry overlaps with the central axis of the fixing hole, or the axis of symmetry is parallel to the central axis of the fixing hole.

To sum up, the motor of the present invention makes each magnet accommodating hole larger than the magnet, so that when each magnet is arranged in the magnet accommodating hole, the magnet accommodating hole can be divided into two isolation holes. Through the design of the isolation hole, the problem of magnetic interference between adjacent magnets can be greatly reduced, thereby reducing the problem of internal friction between the magnets in the motor.

In order to further understand the features and technical content of the present utility model, please refer to the following detailed description and accompanying drawings of the present utility model, but these descriptions and drawings are only used to illustrate the present utility model, not to protect the present utility model. any limitation on the scope.

Description of drawings

FIG. 1 is a schematic perspective view of the motor of the present invention.

FIG. 2 is an exploded schematic view of the motor of the present invention.

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

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

FIG. 5 is a partial enlarged schematic view of FIG. 4 .

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

FIG. 7 is a partial enlarged schematic view of FIG. 6 .

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

Detailed ways

In the following description, if it is indicated to refer to a specific figure or as shown in a specific figure, it is only used for emphasis in the subsequent description, and most of the related content mentioned appears in the specific figure, However, it is not intended to limit this ensuing description to only the specific drawings.

Please refer to FIG. 1 to FIG. 3 together. FIG. 1 and FIG. 2 are three-dimensional assembled and disassembled schematic diagrams of the motor of the present invention, and FIG. 3 is a partial exploded schematic view of the inner rotor and permanent magnet of the motor of 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 . The following mainly describes the differences between the motor 100 of the present invention and the existing motor (especially the reluctance motor), and the control method of the motor 100 of the present invention is substantially the same as the existing motor, and will not be described below. Repeat.

The inner rotor 1 is formed by stacking and fixing a plurality of rotor pieces 10 , the outer stator 3 is formed by stacking and fixing a plurality of stator pieces 30 , and an accommodating channel 30A is formed in the center of the outer stator 3 (as shown in FIG. 2 ), and The inner rotor 1 is correspondingly disposed in the accommodating channel 30A. The inner rotor 1 includes a plurality of magnet accommodating channels 121A (as shown in FIG. 3 ) and a shaft body accommodating channel 11A (as shown in FIG. 3 ), and a plurality of permanent magnets 2 are correspondingly fixed in the plurality of magnet accommodating channels. In 121A, the rotating shaft (not shown) of the motor 100 is correspondingly disposed in the shaft accommodating channel 11A.

In this embodiment, a single magnet accommodating channel 121A is set with a plurality of permanent magnets 2 as an example, but the number of permanent magnets 2 set in a single magnet accommodating channel 121A is not limited to what is shown in the figure. In special applications, a single magnet accommodating channel 121A may also be provided with only a single permanent magnet 2 . In a specific implementation, the permanent magnet 2 may be fixed to the plurality of rotor pieces 10 by adhesive, or the permanent magnet 2 may be directly fixed in the magnet accommodating channel 121A by means of clamping.

Please refer to FIG. 3 to FIG. 6 together. FIG. 4 is a schematic end view of the rotor body of the motor of the present invention, FIG. 5 is a partial enlarged view of FIG. 4 , and FIG. 6 shows the inner rotor and Schematic diagram of the end face of the outer stator. Each rotor piece 10 includes a central shaft hole 11 , a plurality of perforation groups 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 perforation group 12 has two magnet accommodating holes 121 . Each magnet accommodating hole 121 penetrates through the rotor body 10 , and each magnet accommodating hole 121 is not communicated with each other. The two magnet accommodating holes 121 of each perforation group 12 are symmetrically formed on the rotor body 10 with a symmetry axis AX1 (as shown in FIG. 5 ) as the center. In the drawings of this embodiment, it is taken as an example that the rotor body 10 has 8 sets of perforation groups 12, but the number of the perforation groups 12 is not limited to this, and can be increased or decreased according to requirements.

The magnet accommodating holes 121 of the plurality of rotor pieces 10 together form a magnet accommodating channel 121A (as shown in FIG. 3 ) along an axial direction (the X-axis direction of the coordinates shown in FIG. 3 ). 11 together form the shaft body accommodating channel 11A in the axial direction (as shown in FIG. 3 ). The shape of the central shaft hole 11 can be determined according to the shape of the actual rotating shaft, and the figure shown in the figure is only an exemplary aspect. In practical applications, the number of rotor pieces 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 can be changed according to requirements, and are not limited thereto.

The plurality of fixing holes 13 can be used to provide a plurality of fixing members (eg, rivets) to pass through, and the plurality of rotor pieces 10 can be stacked and fixed to each other through the plurality of fixing members. Each fixing hole 13 may be disposed between the two magnet accommodating holes 121 of each group of perforation groups 12, and the fixing hole 13 may be in a rectangular shape, and the central axis of the fixing hole 13 may be overlapped with the symmetry axis AX1 ( Alternatively, the central axis of the fixing hole 13 can also be parallel to the symmetry axis AX1), in this way, the fixing hole 13 and the fixing member disposed therein will not cause too much interference to the magnetic circuit of the motor as a whole.

As shown in FIG. 5 , each magnet accommodating 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 to provide the permanent magnet 2 to pass through, and the cross-sectional shape and cross-sectional size of the rectangular hole 1211 on the wide side of the rotor body 10 are roughly corresponding to the cross-sectional shape of the permanent magnet 2 on the wide side of the rotor body 10 . and the cross-sectional size, and the permanent magnet 2 can be fixedly arranged 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 will be correspondingly disposed in the rectangular hole 1211 , and the magnet accommodating hole 121 will be partitioned by the permanent magnet 2 . Two isolation holes, the two isolation holes are 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 The permanent magnet 2 will not be filled, and the magnet accommodating hole 121 is formed with two isolation holes not filled by the permanent magnet 2 at both ends of the permanent magnet 2 .

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

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

One end of the first long side 1211A is connected with one end of the first inner side 1212A, the other end of the first long side 1211A is connected with the first outer side 1213B, and one end of the second long side 1211B is connected with the second inner side One end of the side 1212B is connected, the other end of the second long side 1211B is connected with the bottom side 1213A, and the two ends of the second outer side 1213C are correspondingly connected with one end of the bottom side 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 accommodating 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; each magnet accommodating One vertex V3 of the outer triangular hole 1213 of the hole 121 is connected to the other end of the first long side 1211A, and one end of the bottom side 1213A of the outer triangular hole 1213 is connected to the second long side 1211B.

According to the above, in simple terms, the part of the outer triangular hole 1213 in this embodiment is formed by one end of the rectangular hole 1211 extending away from the center of the rotor body 10 and in the direction of the symmetry axis AX1 .

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

In practical applications, the two first inner sides 1212A of the same perforation group 12 may be arranged parallel to each other; the first inner side 1212A and the second inner side 1212B of each magnet accommodating hole 121 may be perpendicular to each other The bottom edge 1213A and the second long side edge 1211B of each magnet accommodating hole 121 can be arranged perpendicular to each other; the included angle θ between the central axis AX3 and the symmetry axis AX1 of each rectangular hole 1211 in the same perforation group 12 It can be between 20 degrees and 80 degrees, and the distance between the two magnet accommodating holes 121 of each group of perforation groups 12 is from the position adjacent to the center C of the rotor body 10 to the distance from the center of the rotor body 10. The direction of C gradually expands.

In practical applications, the two adjacent magnet accommodating holes 121 belonging to different perforation groups 12 may also be formed on the rotor body 10 symmetrically with another symmetry axis AX2 as the center. The distance between the two adjacent magnet accommodating holes 121 of different perforation groups 12 gradually decreases from the position adjacent to the center C of the rotor body 10 along the direction away from the center C of the rotor body 10 . Wherein, the two adjacent first outer sides 1213B belonging to different perforation groups 12 may be arranged parallel to each other.

It is particularly noted that, in this embodiment, the two isolation holes (ie, the inner triangular hole 1212 and the outer triangular hole 1213 ) divided by the permanent magnet 2 are both triangular in shape. The shape of each isolation hole (ie, the inner triangular hole 1212 and the outer triangular hole 1213 ) is not limited to this. The shape of each isolation hole (ie, the inner triangular hole 1212 and the outer triangular hole 1213 ) can also be changed according to requirements.

Please refer to FIG. 1 , FIG. 6 and FIG. 7 together. FIG. 7 is a partial enlarged schematic view of FIG. 6 . Each stator body 30 includes an annular 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 body 30 to form a plurality of tooth portions 302 , and each tooth portion 302 extends toward the center of the stator body 30 to form a shoe portion 303 . The side of each shoe portion 303 opposite to the connection with the tooth portion 302 may be in an arc shape. When the inner rotor 1 is arranged in the outer stator 3 , each shoe portion 303 faces the outer edge of the rotor body 10 . The coil S is wound around each tooth portion 302 . In practical applications, the number of coils S wound in the outer stator 3 and which teeth 302 each coil S is wound on can be changed according to requirements, and are not limited herein.

Referring back to FIG. 4 , in practical applications, an outer edge 101 of each rotor piece 10 defines a plurality of protruding sections 10A and a plurality of flat sections 10B. The plurality of protruding sections 10A and the plurality of flat sections 10B are arranged at intervals from each other, and any flat section 10B is correspondingly located between the two protruding sections 10A. The distance L1 from the center C of the rotor blade 10 to the outer edge of the rotor blade 10 in the protruding section 10A is greater than the distance L2 from the center C of the rotor blade 10 to the outer edge of the rotor blade 10 in the gentle section 10B. The number of the protruding sections 10A and the gentle sections 10B may be corresponding to the number of the perforation groups 12 , but is not limited thereto.

In practical applications, each protruding section 10A is correspondingly located on the outer side of the middle position of the two magnet accommodating holes 121 of one set of perforation groups 12 , and each flat section 10B is correspondingly located in two different perforation groups 12 . The outer side of the position of the outer triangular hole 1213 . That is to say, the outer triangular holes 1213 of the two adjacent magnet accommodating holes 121 of the perforated groups 12 belonging to different groups are correspondingly located inside the outer edge of the rotor body 10 in the gentle section 10B.

As shown in FIG. 7 , through the design of the protruding section 10A and the flat section 10B, when the protruding section 10A and the flat section 10B face one of the shoe parts 303 at the same time, the shoe part 303 and the protruding section 10A The gap P1 between will be smaller than the gap P2 between the shoe 303 and the other two gentle sections 10B. Through the design of the protruding section 10A and the flat section 10B, when the two permanent magnets 2 in the same perforated group 12 are roughly facing one of the shoe portions 303, the outer edge of the rotor body 10 and the shoe portion 303 The gap between can be shortened.

As shown in FIG. 3 and FIG. 7 , the magnetic properties of the two permanent magnets 2 disposed in the two magnet accommodating holes 121 of each set of perforation groups 12 are the same as each other, and the magnetic properties of one side surface 21 facing the symmetry axis AX1 are the same as each other. The magnetic properties of one side surface 21 of the two permanent magnets 2 in the perforated group 12 facing each other are different from the magnetic properties of the side facing each other of the two permanent magnets 2 in the adjacent perforated group 12 . Specifically, as shown in FIG. 7 , the magnetism of one side surface 21 of the two permanent magnets 2 located in the same perforated group 12 facing each other in the center of the drawing is assumed to be the S pole, which is located on the right side of the drawing (or The magnetism of one side surface 21 of the two permanent magnets 2 facing each other in the same perforated group 12 on the left) corresponds to the N pole.

Please refer to FIG. 7 and FIG. 8 together. FIG. 8 is a schematic diagram of a magnetic circuit simulation of the motor of the present invention. As shown in the figure, through the aforementioned design of the protruding section 10A and the flat section 10B, as well as the design of making the magnetic properties of the two permanent magnets 2 in the same perforated group 12 facing the same side surface 21, it is possible to make the The magnetic field lines between the shoe 303 and the two permanent magnets 2 located in the same perforated group 12 are denser, so that the inner rotor 1 can be rotated more efficiently relative to the outer stator 3 .

Through the design of the outer triangular holes 1213 , the magnetic lines of force between the two permanent magnets 2 disposed in different perforation groups 12 adjacent to each other can be loosened, and the mutual distance between the permanent magnets 2 disposed in different perforation groups 12 can be greatly reduced In other words, the problem of internal magnetic friction of the inner rotor 1 can be greatly reduced. In addition, in practical applications, an isolation portion 102 is formed between the two adjacent outer triangular holes 1213 belonging to different perforation groups 12 , and the width of the isolation portion 102 is not less than 0.7 mm, whereby the isolation portion 102 is easily magnetic saturation, and can further strengthen and reduce the magnetic force consumption between the permanent magnets 2 in different perforation groups 12.

Similarly, through the design of the inner triangular holes 1212 , the magnetic lines of force between the two permanent magnets 2 disposed in the same perforation group 12 can be loosened, and the two permanent magnets 2 disposed in the same perforation group 12 can be greatly reduced. The magnetic force consumption between the permanent magnets 2, that is, the problem of the magnetic force internal consumption of the inner rotor 1 can be greatly reduced. In addition, in practical applications, an isolation portion 103 may be formed between the two inner triangular holes 1212 of each group of perforation groups 12, and the width of the isolation portion 103 is not less than 0.7 mm, whereby the isolation portion 103 is easy to be magnetically saturated, and also The consumption of the magnetic force between the two permanent magnets 2 in the same perforation group 12 can be further reduced.

To sum up, the motor of the present invention, through the design of the isolation holes (that is, uploading the inner triangular hole and the outer triangular hole), can greatly reduce the problem of internal magnetic friction between the permanent magnets inside the motor, thereby improving the The overall operating efficiency of the motor.

The above descriptions are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all equivalent technical changes made by using the contents of the description and accompanying drawings of the present invention are included in the present invention. within the scope of protection.

Claims (10)

1. A motor, characterized in that the motor comprises: An inner rotor, which includes a plurality of rotor pieces, each of the rotor pieces includes a central shaft hole and a plurality of sets of perforation groups, each set of the perforated groups has two magnet accommodating holes, and each of the magnet accommodating holes Passing through the rotor body, the magnet accommodating holes are not communicated with each other, and the two magnet accommodating holes of each group of the perforation groups are symmetrically formed on the rotor body with a symmetry axis as the center ; A plurality of the rotor pieces are stacked and fixed to each other, and each of the magnet accommodating holes corresponding to each other of the plurality of the rotor pieces together forms a magnet accommodating channel along an axial direction, and a plurality of the Each of the corresponding central shaft holes of the rotor pieces together form a shaft accommodating channel along the axial direction; a plurality of permanent magnets, which are arranged in a plurality of the magnet accommodating channels; each of the permanent magnets is fixedly arranged in one of the magnet accommodating holes, and the magnet accommodating holes are partitioned by the permanent magnets Two isolation holes are formed, and the two isolation holes are located at both ends of the permanent magnet, and the cross-sectional area of the isolation holes adjacent to the outer edge of the rotor piece is larger than that adjacent to the rotor piece. The cross-sectional area of the isolation hole in the center of the center; the two permanent magnets that pass through the two magnet accommodating holes of each group of the perforated groups, which face the magnetic field of the side of the axis of symmetry identical to each other; and An outer stator, which includes a plurality of stator pieces, each of the stator pieces includes an annular portion, a plurality of tooth portions and a plurality of shoe portions, and the plurality of the tooth portions extend from the annular portion to the outer portion. The direction of the center of the stator is extended and formed, and a plurality of the teeth are arranged at intervals from each other, and each of the teeth is extended to the direction of the center of the outer stator to form a shoe; each of the teeth is wound with a coil. 2 . The motor according to claim 1 , wherein each of the magnet accommodating holes is composed of a rectangular hole, an inner triangular hole and an outer triangular hole, and each of the rectangular holes is used to provide the permanent The magnet is penetrated, and the two isolation holes formed by the permanent magnets are the inner triangular hole and the outer triangular hole respectively; the inner triangular hole is arranged adjacent to the center of the rotor body, The outer triangular holes are arranged close to the outer edge of the rotor piece body; the maximum width of each of the outer triangular holes is greater than the width of each of the rectangular holes. 3 . The motor of claim 2 , wherein two long sides of the rectangular hole of each of the magnet accommodating holes opposite to each other are respectively defined as a first long side and a second long side. 4 . side, the two sides of the inner triangular hole of each magnet accommodating hole are respectively defined as a first inner side and a second inner side, and the outer triangular hole of each magnet accommodating hole The three sides 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 to one end of the first inner side. The other end of the 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, and the other end of the second long side is connected with the bottom Edges are connected, and both ends of the second outer edge are correspondingly connected to one end of the bottom edge and one end of the first outer edge, and each of the outer triangular holes is each of the rectangular holes formed by It is formed to extend in a direction away from the center of the rotor piece body and in a direction close to the axis of symmetry. 4 . The motor according to claim 2 , wherein a plurality of protruding sections and a plurality of smooth sections are defined on an outer edge of each of the rotor pieces, and the plurality of the protruding sections and the plurality of flat sections are defined. 5 . Each of the flat sections is spaced apart from each other, and any one of the flat sections is located between two of the protruding sections; the center of the rotor piece to the rotor piece is in the protruding section The distance from the outer edge of the segment is greater than the distance from the center of the rotor piece to the outer edge of the rotor piece at the gentle section. 5 . The motor according to claim 4 , wherein the outer triangular holes of the two adjacent magnet accommodating holes belonging to the different perforation groups are correspondingly located at the respective positions of the rotor body. 6 . the inner side of the outer edge of the flat section. 6 . The motor according to claim 5 , wherein the included angle between the central axis of each of the rectangular holes in the perforation group of the same group and the symmetry axis is between 20 degrees and 80 degrees; 6 . The two magnet accommodating holes adjacent to each other in the perforation group are arranged symmetrically to each other. 7 . The motor according to claim 6 , wherein the distance between the two magnet accommodating holes of each group of the perforated groups is from the position adjacent to the center of the rotor body to the distance from the center of the rotor body. 8 . The direction of the center of the rotor piece body gradually expands; the distance between the two adjacent magnet accommodating holes belonging to different perforation groups is determined by the position adjacent to the center of the rotor piece body, Tapered in a direction away from the center of the rotor piece. 8 . The motor according to claim 6 , wherein an isolation portion is formed between the two adjacent outer triangular holes belonging to different perforation groups, and the width of the isolation portion is not less than 0.7 mm. 9 . The motor according to claim 6 , wherein an isolation portion is formed between the two inner triangular holes of each of the perforation groups, and the width of the isolation portion is not less than 0.7 mm. 10 . 10 . The motor according to claim 2 , wherein a fixing hole is further formed between the two magnet accommodating holes of the perforated groups, the fixing hole is rectangular, and each fixing hole is rectangular. 11 . It is used to provide a fixing piece to be inserted, and a plurality of the rotor pieces are fixed to each other through a plurality of the fixing pieces; wherein, the axis of symmetry overlaps with the central axis of the fixing hole, or the axis of symmetry and The central axes of the fixing holes are parallel.

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