CN218569948U - Rotor structure - Google Patents

Abstract

The utility model provides a rotor structure includes rotor lamination and magnetite. The rotor laminations are stacked in the direction of the central axis. Each rotor lamination includes a body portion and a plurality of receiving slots. The plurality of accommodating grooves are arranged in a radial shape. Each accommodating groove is provided with a first wall, a second wall and a third wall. And air magnetic isolation grooves are arranged between any two adjacent second walls and third walls in the plurality of accommodating grooves and between the first wall and the central shaft. The air magnetism isolating groove comprises a first magnetism isolating area and a second magnetism isolating area, the first magnetism isolating area is located between the second wall and the third wall of the two opposite adjacent containing grooves, the second magnetism isolating area is located between the first wall of the two opposite adjacent containing grooves and the central shaft, and the first magnetism isolating area is communicated with the second magnetism isolating area. The magnets are correspondingly embedded in the plurality of accommodating grooves, and the magnets and the air magnetic isolation grooves are alternately arranged. The utility model provides a rotor structure can optimize rotor structural strength, promotes motor efficiency.

Description

Rotor structure

Technical Field

The utility model relates to a rotor structure especially indicates a rotor structure who is applicable to outer stator motor of inner rotor, separates the magnetic channel with the air and sets up between the built-in magnetite that the spoke type was laid for restrain the produced magnetic leakage of built-in magnetite, optimize rotor structural strength simultaneously.

Background

Generally, a magneto motor or a magneto motor includes a rotor and a stator. The stator includes windings disposed thereon. The rotor includes magnets arranged thereon and is formed by stacking a plurality of rotor laminations, but not limited to, silicon steel sheets. Thus, the magnetic force generated between the stator and the rotor can rotate the rotor.

In a rotor type of a general Interior Permanent Magnet (IPM) motor, an air isolation groove is formed between magnets. The traditional air magnetic isolation groove is in a pentagonal shape and is used for guiding magnetic lines of force generated by the magnets, so that the magnetic lines of force guide magnetic flux to the side of the stator along two oblique edges of the pentagonal shape, and a magnetic field interlinkage provides higher output torque. On the other hand, the air magnetic isolation slot can also be used to isolate the magnetic line flowing toward the axis, which is known as magnetic leakage effect.

However, although the conventional pentagonal air magnetic isolation slot can isolate leakage flux and guide magnetic flux, its effect is still limited. In addition, the pointed point of the pentagon is easy to have the problem of stress concentration and is collided with the space for riveting the riveting point of the rotor silicon steel sheet, and the overall structural strength of the motor is further influenced.

On the other hand, when the rotor silicon steel sheet and the magnet are produced through a mold, a lead R angle is formed at the corner due to production requirements. In order to make the two parts tightly fit together in assembly, the R angles of the rotor silicon steel sheet and the magnet need to be designed accordingly, which increases the cost and reduces the performance. In order to optimize the motor performance, it is desirable in terms of structural design that the R angle of the magnet be small (the smaller the R angle, the larger the magnet is, the better the magnetic characteristics are), and the R angle of the rotor silicon steel sheet magnet groove on the axial side be large (the larger the R angle, the thicker the thickness is, the stronger the structural strength is). However, when the magnet enters the magnetic slot on the rotor silicon steel sheet and approaches to the axial center side, the magnet interferes with the silicon steel sheet, or the joint is point-to-point contact, rather than surface-to-surface contact, which causes the magnet to be skewed and reduces the consistency of the product.

In view of the above, it is actually necessary to provide a rotor structure suitable for radially arranging the magnets of the built-in permanent magnet motor, in which an air magnetic isolation groove is disposed between the magnets arranged in a spoke shape and the central shaft to reduce the magnetic leakage effect, and meanwhile, the required rivet point space of the silicon steel sheet is avoided, the structural strength of the rotor is optimized, and a boss for placing the magnets is additionally provided to solve the disadvantages of the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rotor structure suitable for interior concealed permanent magnet motor magnetite is radial to be arranged sets up air magnetism isolation groove between the magnetite and the center pin that the spoke type was laid for reduce the magnetic leakage effect, dodge the riveting point space of silicon steel sheet demand simultaneously, reach and optimize rotor structure intensity, promote motor efficiency's effect.

Another object of the present invention is to provide a rotor structure. The air magnetism isolating groove arranged on the rotor lamination is arranged on the inner side edge, close to the central shaft, of the hexagonal first magnetism isolating area, and under the limitation that the formation of the rotor lamination is not influenced, the second magnetism isolating areas extend towards the two sides of the first magnetism isolating area along the circumferential direction, so that the characteristic of a jellyfish-like shape is presented. Compared with the existing pentagonal air magnetism isolating groove, the second magnetism isolating region additionally arranged on the hexagonal first magnetism isolating region can further block the magnetic flux of magnetic leakage, the magnetic leakage close to the central shaft is obviously reduced, and the fact that the magnetic flux moves towards the stator side is meant. Therefore, the motor with the rotor structure can effectively improve the output torque of the motor under the condition of the same magnetic dosage. On the other hand, different from the arrangement of the existing pentagonal air magnetic isolation grooves, the hexagonal first magnetic isolation area leads the magnetic force lines to the stator side along the side edge, and the outer side edge provides more spaces for riveting and pressing on the rotor lamination, so that the overall structural strength can be increased without influencing the output torque of the motor.

Another object of the utility model is to provide a rotor structure, wherein the air on the rotor lamination separates the magnetic groove and includes the first magnetism district that separates of hexagon and separates the magnetism district from the second that first magnetism district both sides extend along the circumferencial direction. The shape of the second magnetism isolating region may be, for example, but not limited to, rectangular, oval, semicircular, triangular, polygonal, or the like. It is worth noting that the second magnetism isolating area of the air magnetism isolating groove is located between the two adjacent accommodating grooves and the central shaft of the rotor. Compared with the existing pentagonal air magnetism isolating groove, the design of the hexagonal first magnetism isolating area and the hexagonal second magnetism isolating area is more beneficial to improving the output torque force of the motor. In other words, through the utility model discloses the air that the first magnetism proof district of hexagon adds the second magnetism proof district separates the available less electric current of magnetic groove design and reaches the same output torque, but or can reduce the magnetite quantity, reduces the whole material cost of motor. In addition, aiming at the combination of the magnets and the accommodating groove, a boss is arranged on the first wall of the accommodating groove close to the central shaft, and one end of the magnet is connected to the inside of the accommodating groove along the radial direction. Therefore, under the limitation of magnet mold forming, the protruding boss can provide at least one abutting surface, the protruding boss is not limited to single type presentation, and the abutting surface can be abutted to the magnet to form surface contact when the magnet is placed into the accommodating groove. Namely, the magnet is in surface-to-surface contact with the accommodating groove of the rotor lamination in the magnet entering process, so that the consistency of the magnet entering process is maintained. Moreover, because the R angle of leading of holding in the rotor lamination is between the groove with the air magnetism that separates, for the thinnest department in the rotor lamination, the R angle of storage tank is bigger, helps promoting the structural strength of rotor lamination more. In addition, the boss of cooperation storage tank, the R angle designable of magnetite is less, is favorable to promoting the magnetite utilization ratio more. In other words, the boss of the accommodating groove is in surface contact with the magnets, so that the design space for optimizing the R angle of the rotor lamination accommodating groove and the magnets is facilitated, and the advantages of manufacturing process and performance are brought.

The utility model discloses still another purpose is to provide a rotor structure, and its rotor lamination is more through optimizing the second magnetism isolation district that size design add air magnetism isolation groove, reduces the magnetic leakage of going toward the axis center side on the magnetic circuit, effectively improves output torque. The hexagonal first magnetism isolating area of the air magnetism isolating groove is beneficial to improving the structural strength and making up enough space for the rotor lamination to be riveted and pressed. The boss design of the containing groove further improves the structural strength and the consistency of products.

To achieve the above object, the present invention provides a rotor structure including a plurality of rotor laminations and a plurality of magnets. The plurality of rotor laminations are stacked along a direction of a central shaft, wherein each rotor lamination comprises a body part and a plurality of accommodating grooves. The plurality of accommodating grooves are arranged in a radial shape. Each of the plurality of accommodating grooves is provided with a first wall, a second wall and a third wall, the first wall is connected between the second wall and the third wall, an air magnetic isolation groove is arranged between any two adjacent second walls and third walls in the plurality of accommodating grooves and between the first wall and the central shaft, the air magnetic isolation groove comprises a first magnetic isolation area and two second magnetic isolation areas, the first magnetic isolation area is positioned between the second wall and the third wall of the two opposite adjacent accommodating grooves, the second magnetic isolation area is positioned between the first wall and the central shaft of the two opposite adjacent accommodating grooves, and the first magnetic isolation area is communicated with the second magnetic isolation area. The plurality of magnets are correspondingly embedded in the plurality of accommodating grooves, and the plurality of magnets and the air magnetic isolation grooves are alternately arranged.

In one embodiment, the second magnetic isolation regions extend towards two sides of the circumferential direction with the corresponding and connected first magnetic isolation regions as centers, wherein the first magnetic isolation regions are polygonal.

In one embodiment, the polygon is a hexagon.

In an embodiment, each magnet is accommodated in the corresponding accommodating groove along the central axis and has a first end portion and a second end portion which are arranged oppositely, the first end portion and the second end portion are connected to two side walls of the magnet, wherein the first end portion is adjacently arranged on the outer periphery of the plurality of rotor laminations, and the second end portion faces the central axis and is connected to the first wall of the corresponding accommodating groove.

In one embodiment, a rib is formed between the air magnetic isolation groove and the adjacent accommodating groove, and the rib is at least attached to the side wall of the corresponding magnet.

In one embodiment, the rib and the second end of the corresponding magnet form a gap.

In one embodiment, the ribs are L-shaped and respectively abut against the side wall and the second end of the corresponding magnet.

In an embodiment, each of the accommodating grooves further includes a boss protruding from a center of the first wall of the accommodating groove toward an inside of the accommodating groove in a radial direction, wherein the boss abuts against a portion of the second end of the corresponding magnet, and an R angle formed by the second end and the side wall of the magnet is smaller than an R angle formed by the first wall and the second wall of the accommodating groove and an R angle formed by the first wall and the third wall of the accommodating groove.

In one embodiment, the boss includes at least one abutting surface, which abuts on the second end portion of the corresponding magnet.

In one embodiment, the outer side of the first magnetic shielding region away from the central axis is perpendicular to the radial direction.

In one embodiment, the inner side of the air magnetism isolating groove is connected between the second magnetism isolating areas and is disposed adjacent to the central axis, and the two side edges of the air magnetism isolating groove are respectively connected to the second magnetism isolating areas and are parallel to the second wall or the third wall of the adjacent accommodating groove.

In one embodiment, the number of the plurality of magnets is 2M, M is an integer, and M is greater than or equal to 2.

In one embodiment, two adjacent magnets of the plurality of magnets have opposite magnetic properties.

In one embodiment, the plurality of rotor laminations are open rotor laminations and/or closed rotor laminations, wherein first ends of the plurality of magnets remain at least partially exposed when the plurality of magnets penetrate the open rotor laminations in the direction of the central axis, and wherein the first ends of the plurality of magnets remain unexposed when the plurality of magnets penetrate the closed rotor laminations in the direction of the central axis.

The foregoing description of the present invention will be apparent to those skilled in the art from the following detailed description and the accompanying drawings.

Drawings

Fig. 1A shows a three-dimensional structure diagram of a rotor structure according to a first embodiment of the present invention;

fig. 1B shows a perspective view of another embodiment of the rotor structure of the present invention;

fig. 2 discloses a top view of a rotor structure according to a first embodiment of the present invention;

FIG. 3 discloses a close-up view of region P1 in FIG. 2;

fig. 4A to 4D disclose other different embodiments of the air magnetic shield groove in the rotor structure according to the first embodiment of the present invention;

fig. 5A discloses a perspective view of a rotor structure according to a second embodiment of the present invention;

fig. 5B is a perspective view of another embodiment of the rotor structure of the present invention;

fig. 6 discloses a top view of a rotor structure according to a second embodiment of the present invention;

FIG. 7 discloses a close-up view of region P2 in FIG. 6;

fig. 8 shows another embodiment of the accommodating groove in the rotor structure according to the second embodiment of the present invention.

Description of the reference numerals

1. 1a: rotor structure

2. 2', 2a': rotor lamination

10: body part

11: rib

12: outer peripheral edge

13. 13a: boss

130: sticking face

20. 20', 20a': containing groove

21: first wall

22: the second wall

23: third wall

24: opening(s)

25: the fourth wall

30: air magnetism isolating groove

31: first magnetic isolation region

31a: inner side edge

31b: outer side edge

31c: side edge

32: second magnetic isolation region

3: magnet

3a: first end part

3b: second end portion

3c: side wall

C: center shaft

G: gap

P1, P2: region(s)

R1 and R2: angle R

Detailed Description

Some exemplary embodiments that embody the features and advantages of the present invention will be described in detail in the description of the later sections. It is to be understood that the invention is capable of other modifications in various embodiments without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive. For example, the following description of the present invention includes embodiments in which a first feature is provided on or above a second feature, including embodiments in which the first feature and the second feature are provided in direct contact, and also includes embodiments in which additional features may be provided between the first feature and the second feature, such that the first feature and the second feature may not be in direct contact. In addition, it is disclosed that repeated reference characters and/or designations may be used in various embodiments of the invention. These repetitions are for simplicity and clarity and are not intended to limit the relationship between the various embodiments and/or the appearance structures. Furthermore, spatially relative terms, such as "inner," "outer," "upper," "lower," and the like, may be used herein for convenience in describing the relationship of one element or feature to another element(s) or feature(s) in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may also be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used should be interpreted accordingly. Further, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. In addition, it is to be understood that although the terms "first", "second", "third", etc. may be used in the claims to describe various elements, these elements should not be limited by these terms, and the elements described in the embodiments are denoted by different reference numerals. These terms are for the respective different components. For example: a first component may be termed a second component, and similarly, a second component may be termed a first component without departing from the scope of the embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Except in the operating/working examples, or unless explicitly stated otherwise, all numerical ranges, amounts, values and percentages disclosed herein (such as those percentages of angles, time durations, temperatures, operating conditions, ratios of amounts, and the like) are to be understood as modified in all embodiments by the term "about" or "substantially". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the specification and attached claims are disclosed as approximations that may vary as desired. For example, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding principles. Ranges may be expressed herein as from one end point to the other end point or between the two end points. All ranges disclosed herein are inclusive of the endpoints unless otherwise specified.

Fig. 1A shows a perspective view of a rotor structure according to a first embodiment of the present invention. Fig. 2 discloses a top view of a rotor structure according to a first embodiment of the present invention. Fig. 3 discloses a partially enlarged view of the region P1 in fig. 2. In the present embodiment, the rotor structure 1 is suitable for an Interior Permanent Magnet (IPM) motor (not shown), and adopts an inner rotor and an outer stator design, in which the rotor structure 1 rotates around a central axis C as a center relative to the stator (not shown), in which the central axis C of the rotor structure 1 is configured as a rotating shaft of the motor. Of course, the present invention is not limited thereto. In the present embodiment, the rotor structure 1 includes a plurality of rotor laminations 2 and a plurality of magnets 3. The plurality of rotor laminations 2 may be, for example but not limited to, silicon steel sheets. Each rotor lamination 2 has the same structure and is stacked in the direction of the central axis C. In addition, the central axis C can also be regarded as the symmetry center of the rotor structure 1 and the rotor lamination 2. Of course, in the present embodiment, the number, the spacing distance and the single thickness of the rotor laminations 2 can be adjusted according to the actual requirement, and the present invention is not limited thereto. In one embodiment, the plurality of rotor laminations 2 may be formed into an integrated structure by riveting. The present invention is not limited thereto. In the present embodiment, each rotor lamination 2 includes a body portion 10 and a plurality of receiving grooves 20. The main body 10 is made of silicon steel sheet, for example. The plurality of receiving grooves 20 are radially arranged and annularly arranged at equal intervals with the central axis C as the center. Each of the receiving grooves 20 is substantially rectangular and has a first wall 21, a second wall 22 and a third wall 23, the second wall 22 and the third wall 23 are disposed opposite to each other, and the first wall 21 is connected between the second wall 22 and the third wall 23. In the present embodiment, the first wall 21 is disposed adjacent to the central axis C, and the other opening 24 is disposed adjacent to the outer periphery 12 of the rotor lamination 2. In other words, the accommodating groove 20 extends in a radial direction, and the two opposite second walls 22 and third walls 23 thereof are connected between the first wall 21 and the opening 24. In the present embodiment, an air magnetic isolation groove 30 is further disposed between any two adjacent second walls 22 and third walls 23 of the plurality of accommodating grooves 20 and between the first wall 21 and the central axis C. The air magnetic shield groove 30 includes a first magnetic shield region 31 and a second magnetic shield region 32. The first magnetic isolating area 31 is located between the second wall 22 and the third wall 23 of two adjacent receiving grooves 20. The second magnetism isolating area 32 is located between the first wall 21 of two opposite adjacent accommodating grooves 20 and the central axis C, and extends towards two sides along the circumferential direction with the correspondingly communicated first magnetism isolating areas 31 as the center. Therefore, the second magnetism isolating area 32 of each air magnetism isolating groove 30 is respectively located between the first wall 21 of two opposite adjacent accommodating grooves 20 and the central axis C. It should be noted that the first magnetism isolating region 31 of each air magnetism isolating slot 30 is further designed to be polygonal, such as but not limited to a hexagon, and the inner side 31a of the first magnetism isolating region 31 adjacent to the central axis C is connected to two second magnetism isolating regions 32 extending along the circumferential direction. Under the limitation that the forming of the single rotor lamination 2 is not influenced, the inner side edge 31a of the first magnetism isolating area 31 of each air magnetism isolating groove 30 close to the central axis C extends out of the second magnetism isolating areas 32 towards the two sides of the first magnetism isolating area 31 along the circumferential direction, and the characteristics of jellyfish-like appearance are presented. Compared with the conventional pentagonal air magnetic isolation slot, the second magnetic isolation region 32 additionally arranged on the hexagonal first magnetic isolation region 31 is positioned between the first walls 21 of the two opposite adjacent accommodating grooves 20 and the central axis C, so that the magnetic flux of the leakage flux can be further blocked, especially the leakage flux close to the central axis C is obviously reduced, which means that the magnetic flux moves to the stator side. The effects of effectively blocking the leakage flux and improving the motor efficiency will be further described later.

In the present embodiment, the plurality of magnets 3 penetrate the body portion 10 of the plurality of rotor laminations 2 along the direction of the central axis C and are correspondingly embedded in the plurality of accommodating grooves 20. In the present embodiment, the rotor structure 1 includes, for example, ten magnets 3, which penetrate the body portion 10 of the plurality of rotor laminations 2 in the direction of the central axis C, and are arranged in a radial manner around the center of the body portion 10. In the present embodiment, any two adjacent magnets 3 have opposite magnetic polarities. For example, among the ten magnets 3, five N-pole magnets 3 and five S-pole magnets 3 are alternately arranged. In other embodiments, the rotor structure 1 has, for example, 2M magnets 3, where M is a whole and is greater than or equal to 2. Of course, the present invention is not limited thereto. In this embodiment, each magnet 3 extends in the radial direction, and a plurality of magnets 3 and air-insulated magnetic grooves 30 are alternately arranged. In the present embodiment, each magnet 3 is accommodated in the corresponding accommodating slot 20 along the central axis C, and has a first end portion 3a and a second end portion 3b opposite to each other, and the first end portion 3a and the second end portion 3b are further connected to two side walls 3C of the magnet 3. The first end portion 3a is disposed adjacent to the outer periphery 12 of the plurality of rotor laminations 2 and exposed through the opening 24, the two side walls 3C are respectively connected to the second wall 22 and the third wall 23 of the accommodating groove 20, and the second end portion 3b faces the central axis C and is connected to the first wall 21 of the corresponding accommodating groove 20.

In the present embodiment, a rib 11 is formed between the air magnetic isolation groove 30 and the adjacent accommodating groove 20, and the rib 11 at least abuts against the side wall 3c of the corresponding magnet 3. In the present embodiment, the rib 11 is L-shaped and abuts against the side wall 3c and the second end 3a of the corresponding magnet 3. Of course, the present invention is not limited thereto. It should be noted that the plurality of accommodating grooves 20 and the corresponding magnets 3 have similar shapes, so that the plurality of magnets 3 penetrate through the body portion 10 of the plurality of rotor laminations 2 along the direction of the central axis C, and are tightly attached to each other when being correspondingly embedded in the plurality of accommodating grooves 20. Of course, both of them can be adjusted in size and quantity according to the actual application requirements, but the present invention is not limited thereto.

In the present embodiment, each of the plurality of rotor laminations 2 is an open-type rotor lamination 2, wherein when the plurality of magnets 3 penetrate the open-type rotor lamination 2 along the direction of the central axis C, the first ends 3a of the plurality of magnets 3 remain at least partially exposed through the openings 24. In another embodiment, the plurality of rotor laminations 2 may be, for example, all closed rotor laminations 2', or a combination of open rotor laminations 2 and closed rotor laminations 2'. As shown in fig. 1B, the receiving groove 20' further includes a fourth wall 25 connected between the second wall 22 and the third wall 23. The first wall 21 and the fourth wall 25 are disposed opposite to each other, when the plurality of magnets 3 penetrate the plurality of closed-type rotor laminations 2' along the direction of the central axis C, each magnet 3 extends in the radial direction, the first end portion 3a of the magnet 3 corresponds to the outer circumferential edge 12, the second end portion 3b of the magnet 3 faces the central axis C, and the first end portion 3a of the plurality of magnets 3 corresponding to the outer circumferential edge 12 is covered by the fourth wall 25 and is kept unexposed. It should be noted that the way in which the rotor laminations 2, 2' grip the first end 3a of the magnet 3 is not a limitation to the essential features of the present invention, but the present invention is not limited thereto.

It should be noted that, in the present embodiment, the first magnetism isolating area 31 of each air magnetism isolating slot 30 is disposed perpendicular to the radial direction at the outer side 31b far from the central axis C. Compared with the existing pentagonal air magnetism isolating groove, the vertex angle of the pentagonal air magnetism isolating groove points to the space on the rotor lamination 2, where the rotor lamination 2 can be riveted, the outer side edge 31b of the first magnetism isolating area 31 is perpendicular to the radial direction and approximately aligned with the circumferential direction, so that the outer side edge 31b avoids the space on the rotor lamination 2, where the rotor lamination 2 can be riveted. Therefore, the overall structural strength of the rotor lamination 2 can be increased without influencing the output torque of the motor. In addition, in the present embodiment, in the first magnetism isolating area 31 of each air magnetism isolating groove 30, the two side edges 31c connected to the inner edge 31a through the second magnetism isolating area 32 are more parallel to the second wall 22 and the third wall 23 of the adjacent accommodating groove 20, i.e., parallel to the side wall 3c of the adjacent magnet 3. Different from the arrangement of current pentagon air isolation magnetic slot, the utility model discloses the outside limit 31b perpendicular to of the first magnetic isolation district 31 of hexagon is radial, and the other side limit 31c of two is on a parallel with the second wall 22 and the third wall 23 of adjacent storage tank 20 and the lateral wall 3c of adjacent magnetite 3, and magnetite 3 and rotor lamination 2's combination makes the magnetic line of force can follow the side and guide to the stator side when the function. Therefore, the output torque of the motor with the rotor structure 1 can be effectively improved under the condition of the same magnetic dosage.

In the present embodiment, the air isolation slots 30 on the rotor lamination 2 include a hexagonal first isolation region 31 and a second isolation region 32 extending from both sides of the first isolation region 31 along the circumferential direction. The second magnetic shielding regions 32 are, for example, rectangular and extend from both sides of the first magnetic shielding region 31 in the circumferential direction. Fig. 4A to 4D disclose other different embodiments of the air magnetic isolation groove in the rotor structure according to the first embodiment of the present invention. In one embodiment, the second magnetism isolating regions 32 are, for example, triangular respectively, with the vertex angles outward and biased toward the central axis C to extend from both sides of the first magnetism isolating region 31 along the circumferential direction, as shown in fig. 4A. In one embodiment, the second magnetic shielding regions 32 are, for example, oval, and the semi-circles at the ends extend outward from the two sides of the first magnetic shielding region 31 along the circumferential direction, as shown in fig. 4B. In one embodiment, the second magnetic isolation regions 32 are, for example, pentagonal, with the right vertex angle outward and extending from the two sides of the first magnetic isolation region 31 along the circumferential direction, as shown in fig. 4C. In one embodiment, the second magnetic isolation regions 32 are, for example, pentagonal, with a right vertex angle inward and extending from two sides of the first magnetic isolation region 31 along the circumferential direction, as shown in fig. 4D. In other embodiments, the shape of the second magnetism isolating region 32 can be, for example, but not limited to, rectangular, oval, semicircular, triangular, polygonal, or a combination thereof. It should be noted that the two second magnetism isolating areas 32 of the air magnetism isolating groove 30 extend from the two sides of the first magnetism isolating area 31 along the circumferential direction, so that the two second magnetism isolating areas 32 of the air magnetism isolating groove 30 are located between the first walls 21 of the two opposite adjacent accommodating grooves 20 and the central axis C of the rotor. Compared with the existing pentagonal air magnetic isolation groove, the design of the hexagonal first magnetic isolation region 31 and the second magnetic isolation region 32 can further block the magnetic flux towards the direction of the central shaft C, and especially the magnetic flux leakage close to the central shaft C is obviously reduced, so that the magnetic flux can more effectively move towards the stator side, and the output torque of the motor 1 can be more favorably improved. In other words, through the utility model discloses the air that hexagon first magnetism isolating region 31 adds second magnetism isolating region 32 separates the magnetic groove 30 design and can use less electric current to reach the same output torque, but or can reduce the magnetite 3 quantity, reaches the purpose that reduces the whole material cost of motor. Of course, the present invention is not limited thereto.

Fig. 5A shows a perspective view of a rotor structure according to a second embodiment of the present invention. Fig. 6 discloses a top view of a rotor structure according to a second embodiment of the present invention. Fig. 7 discloses a partially enlarged view of the region P2 in fig. 6. In the present embodiment, the rotor structure 1A and the rotor lamination 2a are similar to the rotor structure 1 and the rotor lamination 2 shown in fig. 1A to fig. 3, and the same element numbers represent the same elements, structures and functions, which are not described herein again. In the present embodiment, each receiving groove 20a further includes a protrusion 13 protruding from the center of the first wall 21 of the receiving groove 20a toward the inside of the receiving groove 20a along the radial direction. The plurality of magnets 3 penetrate through the body portion 10 of the plurality of rotor laminations 2a along the direction of the central axis C, and when the plurality of magnets are correspondingly embedded in the plurality of accommodating grooves 20a, the bosses 13 are further abutted against a part of the second end portions 3b of the corresponding magnets 3. In the embodiment, the boss 13 includes at least one abutting surface 130, which abuts on the second end portion 3b of the magnet 3 and is in surface-to-surface contact with each other. It should be noted that an R angle R1 formed by the second end 3b and the side wall 3c of the magnet 3 is smaller than an R angle R2 formed by the first wall 21 and the second wall 22 of the corresponding accommodating groove 20 and an R angle R2 formed by the first wall 21 and the third wall 23. When the magnet 3 is placed in the accommodating groove 20a, the accommodating groove 20a can be attached to the second end portion 3b of the magnet 3 through the abutting surface 130 of the boss 13 to form surface contact. That is, the magnets 3 are in surface-to-surface contact with the accommodating grooves 20a of the rotor laminations 2a during the magnet-inserting process, so as to maintain the consistency of the magnet-inserting process of the magnets 3.

In the present embodiment, each of the plurality of rotor laminations 2a is an open-type rotor lamination 2a, wherein when the plurality of magnets 3 penetrate the open-type rotor lamination 2 along the direction of the central axis C, the first ends 3a of the plurality of magnets 3 remain at least partially exposed through the openings 24. In another embodiment, the plurality of rotor laminations 2a may be, for example, all closed rotor laminations 2a ', or combined open rotor laminations 2a and closed rotor laminations 2a ', as shown in fig. 5B, the accommodating groove 20a ' further includes a fourth wall 25 connected between the second wall 22 and the third wall 23. The first wall 21 and the fourth wall 25 are disposed opposite to each other, when the plurality of magnets 3 penetrate the plurality of closed-type rotor laminations 2a' in the direction of the central axis C, each magnet 3 extends in the radial direction, the first end portion 3a of the magnet 3 corresponds to the outer circumferential edge 12, the second end portion 3b of the magnet 3 faces the central axis C, and the first end portion 3a of the plurality of magnets 3 corresponding to the outer circumferential edge 12 is covered by the fourth wall 25 and is kept unexposed. It should be noted that the way in which the rotor laminations 2a, 2a' grip the first end 3a of the magnet 3 is not limited to the essential technical features of the present invention, and the present invention is not limited thereto and will not be described in detail.

On the other hand, in the present embodiment, the rib 11 and the second end 3b of the corresponding magnet 3 form a gap G, allowing the accommodating groove 20a to form a larger R angle R2. Since the receiving groove 20a in the rotor lamination 2a forms an R angle between the air magnetism isolating groove 30 and the R angle, which is the thinnest position in the rotor lamination 2a, the larger the R angle R2 of the receiving groove 20a is, the more the structural strength of the rotor lamination 2a is improved. In addition, the smaller the designable R angle R1 of the magnet 3 becomes in cooperation with the boss 13 in the accommodating groove 20a, which is more advantageous for increasing the magnet utilization rate. In other words, the utility model discloses a face contact of shape between boss 13 of storage tank 20a and magnetite 3 is favorable to realizing the design space of rotor lamination 2a storage tank 20a and the R angle optimization of magnetite 3, brings the advantage in processing procedure and the performance.

Fig. 8 shows another embodiment of the accommodating groove in the rotor structure according to the second embodiment of the present invention. In the embodiment, two bosses 13a are further disposed on the first wall 21 of each accommodating groove 20a, and the abutting surface 130 of each boss 13a can be firmly adhered to a part of the surface of the second end portion 3b of the magnet 3, so as to form surface-to-surface contact with each other. Therefore, the convex boss 13a can provide at least one abutting surface 130 under the restriction of the mold forming of the magnet 3, and is not limited to a single type, and the abutting surface 130 can be abutted to the magnet 3 to form surface contact when the magnet 3 is placed in the accommodating groove 20 a. That is, the magnets 3 are in surface-to-surface contact with the accommodating grooves 20a of the rotor laminations 2a during the magnet-entering process, so as to maintain the consistency of the magnet-entering process. Of course, the present invention is not limited thereto and will not be described in detail.

To sum up, the utility model provides a radial arrangement rotor structure of magnetite suitable for interior concealed permanent magnet motor sets up air magnetic isolation groove between the magnetite that spoke type was laid for reduce the magnetic leakage effect, dodge the riveting point space of silicon steel sheet demand simultaneously, reach and optimize rotor structural strength, promote motor efficiency's effect. The utility model discloses the air that sets up on the rotor lamination separates the magnetism groove and is close to the inboard side of center pin in the first magnetism district that separates of hexagon, under the restriction that does not influence the rotor lamination and take shape, extends two seconds and separates the magnetism district towards the both sides in first magnetism district along the circumferencial direction, presents the characteristic like jellyfish form. Compared with the existing pentagonal air magnetism isolating groove, the second magnetism isolating area additionally arranged on the hexagonal first magnetism isolating area can further block the magnetic flux of leakage magnetism, the leakage magnetism close to the central shaft is obviously reduced, and the magnetism moves towards the stator side. Therefore, the motor with the rotor structure can effectively improve the output torque of the motor under the condition of the same magnetic dosage. On the other hand, different from the arrangement of the existing pentagonal air magnetic isolation grooves, the hexagonal first magnetic isolation area leads the magnetic force lines to the stator side along the side edge, and the outer side edge provides more spaces for riveting and pressing on the rotor lamination, so that the overall structural strength can be increased without influencing the output torque of the motor. The air magnetism isolating groove on the rotor lamination comprises a hexagonal first magnetism isolating area and two second magnetism isolating areas extending from two sides of the first magnetism isolating area along the circumferential direction. The shape of the two second magnetism isolating areas can be, for example, but not limited to, a rectangle, an ellipse, a semicircle, a triangle, a polygon and the like. It is worth noting that the two second magnetism isolating areas of the air magnetism isolating groove are located between the two adjacent accommodating grooves and the central shaft of the rotor. Compared with the existing pentagonal air magnetic isolation groove, the design of the hexagonal first magnetic isolation area and the two second magnetic isolation areas is more favorable for improving the output torque force of the motor. In other words, through the utility model discloses the air that the first magnetism proof district of hexagon adds two second magnetism proof districts separates the available less electric current of magnetic groove design and reaches the same output torque, but or can reduce the magnetite quantity, reduces the whole material cost of motor. In addition, aiming at the combination of the magnets and the accommodating groove, a boss is arranged on the first wall of the accommodating groove close to the central shaft, and one end of the magnet is connected to the inside of the accommodating groove along the radial direction. Therefore, under the limitation of magnet mold forming, the protruding boss can provide at least one abutting surface, the protruding boss is not limited to single type presentation, and the abutting surface can be abutted to the magnet to form surface contact when the magnet is placed into the accommodating groove. Namely, the magnet is in surface-to-surface contact with the accommodating groove of the rotor lamination in the magnet-in process, so that the consistency of the magnet-in process is maintained. Moreover, because the R angle of the guide part and the air magnetic isolation groove are arranged in the rotor lamination, the R angle of the accommodating groove is larger at the thinnest part of the rotor lamination, and the structural strength of the rotor lamination is improved. In addition, the boss of cooperation storage tank, the R angle designable of magnetite is less, is favorable to promoting the magnetite utilization ratio more. In other words, the boss of the accommodating groove is in surface contact with the magnets, so that the design space for optimizing the R angle of the rotor lamination accommodating groove and the magnets is facilitated, and the advantages of manufacturing process and performance are brought. Therefore, the utility model discloses the rotor lamination is more through optimizing two second magnetism isolation areas that size design add the air magnetism isolation groove, reduces the magnetic leakage toward the axis center side on the magnetic circuit, effectively improves the output torque. The hexagonal first magnetism isolating area of the air magnetism isolating groove is beneficial to improving the structural strength and making up enough space for the rotor lamination to be riveted and pressed. The boss design of the accommodating groove further improves the structural strength and the consistency of products.

The present invention can be modified by anyone skilled in the art without departing from the scope of the appended claims.

Claims (14)

1. A rotor structure, comprising:

a plurality of rotor laminations stacked along a direction of a central axis, wherein each rotor lamination includes a body portion and a plurality of receiving slots, the receiving slots are radially disposed, each of the receiving slots has a first wall, a second wall and a third wall, the first wall is connected between the second wall and the third wall, an air magnetic isolation slot is disposed between any two adjacent second walls and third walls of the receiving slots and between the first wall and the central axis, the air magnetic isolation slot includes a first magnetic isolation area and a second magnetic isolation area, the first magnetic isolation area is disposed between the second wall and the third wall of the two adjacent receiving slots, the second magnetic isolation area is disposed between the first wall of the two adjacent receiving slots and the central axis, and the first magnetic isolation area is communicated with the second magnetic isolation area; and

and the plurality of magnets are correspondingly embedded in the plurality of accommodating grooves, and the plurality of magnets and the air magnetic isolation grooves are alternately arranged.

2. The rotor structure according to claim 1, wherein the second flux barrier extends from the first flux barrier in a polygonal shape around the center of the corresponding and connected second flux barrier toward both sides in a circumferential direction.

3. The rotor structure of claim 2, wherein the polygon is a hexagon.

4. The rotor structure of claim 1, wherein each of the magnets is received in the corresponding receiving slot along the central axis and has a first end portion and a second end portion, the first end portion and the second end portion being connected to two sidewalls of the magnet, wherein the first end portion is disposed adjacent to an outer periphery of the plurality of rotor laminations, and the second end portion faces the central axis and is connected to the first wall of the corresponding receiving slot.

5. The rotor structure according to claim 4, wherein a rib is formed between the air magnetic isolation groove and the adjacent accommodating groove, and the rib is at least abutted to the side wall of the corresponding magnet.

6. The rotor structure according to claim 5, wherein the rib forms a gap with the second end portion of the corresponding magnet.

7. The rotor structure according to claim 5, wherein the rib is L-shaped and abuts against the side wall of the corresponding magnet and the second end portion.

8. The rotor structure according to claim 4, wherein each of the receiving grooves further includes a protrusion protruding from the first wall of the receiving groove toward an inside of the receiving groove, wherein the protrusion abuts against the second end of the corresponding magnet, and wherein an R angle formed by the second end of the magnet and the side wall is smaller than an R angle formed by the first wall and the second wall of the receiving groove and an R angle formed by the first wall and the third wall.

9. The rotor structure according to claim 8, wherein the boss includes at least one abutting surface abutting on the second end portion of the corresponding magnet.

10. The rotor structure of claim 1, wherein an outer side of the air dam groove away from the central axis is perpendicular to a radial direction.

11. The rotor structure of claim 1, wherein inner sides of the air isolation slots are connected between the second isolation regions and are disposed adjacent to the central shaft, wherein both side sides of the air isolation slots are connected to the second isolation regions, respectively.

12. The rotor structure according to claim 1, wherein the plurality of magnets are 2M, M is an integer, and M is 2 or more.

13. The rotor structure according to claim 1, wherein two adjacent ones of the plurality of magnets have opposite magnetic properties.

14. The rotor structure of claim 4, wherein the plurality of rotor laminations are open rotor laminations and/or closed rotor laminations, wherein the first ends of the plurality of magnets remain at least partially exposed when the plurality of magnets extend through the open rotor laminations in the direction of the central axis, and wherein the first ends of the plurality of magnets remain unexposed when the plurality of magnets extend through the closed rotor laminations in the direction of the central axis.

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