CN217720856U - Rotor core and motor - Google Patents
Rotor core and motor Download PDFInfo
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- CN217720856U CN217720856U CN202221653558.6U CN202221653558U CN217720856U CN 217720856 U CN217720856 U CN 217720856U CN 202221653558 U CN202221653558 U CN 202221653558U CN 217720856 U CN217720856 U CN 217720856U
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Abstract
The utility model provides a rotor core and a motor, wherein, the rotor core comprises a plurality of groups of magnetic steel components which are arranged in equal parts in the circumferential direction and a rotating shaft through hole which is arranged at the center of the rotor core, and the rotating shaft through hole is used for sleeving the rotor core on a rotating shaft; each group of magnetic steel assemblies comprises a first magnetic steel groove, a second magnetic steel groove and an air groove, and the first magnetic steel groove and the second magnetic steel groove are symmetrically arranged on two sides of the center line of each magnetic steel assembly; the air slot comprises side walls symmetrically arranged on two sides of the central line, the side walls and the outer wall of the adjacent first magnetic steel slot or the outer wall of the adjacent second magnetic steel slot form a first magnetic bridge, and the extension line of one side of the side wall, which is far away from the through hole of the rotating shaft, is intersected with the central line. The technical scheme of this application can improve the mechanical strength of motor to satisfy the high rotational speed demand of rotor.
Description
Technical Field
The utility model relates to a drive arrangement technical field, in particular to rotor core and motor.
Background
When the permanent magnet motor runs at a high speed, a high-speed motor rotor in the permanent magnet motor can be subjected to high-speed centrifugal force impact, so that the mechanical strength of the rotor needs to be ensured to reduce the potential risk of rotor fracture and failure. The common motor improves the mechanical strength of the rotor and reduces the deformation of the rotor by using the high-strength silicon steel sheet, but the cost of the motor is increased due to the high price of the high-strength silicon steel sheet; another common arrangement is to thicken the thickness of the magnetic isolation bridge so that the rotor can bear a higher centrifugal force, but such an arrangement would cause an increase in the magnetic flux leakage of the motor, resulting in a decrease in the torque output capability of the motor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a rotor core and motor aims at improving the mechanical strength of rotor to satisfy the high rotational speed demand of motor.
In order to achieve the above object, the present invention provides a rotor core, which comprises a plurality of sets of magnetic steel assemblies disposed in equal intervals in the circumferential direction and a rotating shaft through hole disposed in the center of the rotor core, wherein the rotating shaft through hole is used for sleeving the rotor core on a rotating shaft;
each group of magnetic steel assemblies comprises a first magnetic steel groove, a second magnetic steel groove and an air groove, and the first magnetic steel groove and the second magnetic steel groove are symmetrically arranged on two sides of the center line of each magnetic steel assembly;
the air groove comprises side walls symmetrically arranged on two sides of the central line, the side walls and the outer wall of the first magnetic steel groove or the second magnetic steel groove close to the side walls form a first magnetic bridge, and an extension line of one side of each side wall, far away from the through hole of the rotating shaft, is intersected with the central line.
Optionally, an included angle between an extension line of the sidewall and the center line ranges from 16 ° to 27 °.
Optionally, the first magnetic bridge is a parallel magnetic bridge, and the thickness of the first magnetic bridge is 1.0mm to 1.8mm.
Optionally, the air slot further includes a lower wall, two ends of the lower wall are respectively connected to the adjacent side walls, the lower wall is of an arc structure, and an arc opening of the lower wall faces the outer edge of the rotor core.
Optionally, the air slot further includes a lower wall, and two ends of the lower wall are respectively connected to the adjacent side walls; the section of the lower wall is formed by sequentially connecting a plurality of line segments, wherein the connection point of the line segments is close to the rotating shaft through hole compared with the connection point of the lower wall and the side wall.
Optionally, the air tank further includes an upper wall perpendicular to the center line, and two ends of the upper wall are respectively connected to end points of one side of the two side walls away from the rotating shaft through hole.
Optionally, the magnetic steel assembly further includes a third magnetic steel slot perpendicular to the center line, and the third magnetic steel slot is closer to an outer edge of the rotor core than the air slot.
Optionally, the magnetic steel assembly further comprises a fourth magnetic steel slot and a fifth magnetic steel slot symmetrically arranged on two sides of the central line, wherein the fourth magnetic steel slot is located in the first magnetic steel slot and radially close to the rotor core at the outer edge of the rotor core, and the fifth magnetic steel slot is located in the second magnetic steel slot and radially close to the rotor core at the outer edge of the rotor core.
Optionally, the magnetic steel assembly further comprises a magnetic isolation through hole arranged between the fourth magnetic steel groove and the fifth magnetic steel groove.
The utility model also provides a motor, including stator, pivot and aforementioned arbitrary rotor core, rotor core includes the multiunit magnet steel assembly that its circumference equally set up and the pivot through-hole that sets up in its center, and the pivot through-hole is used for overlapping the rotor core cover in the pivot; each group of magnetic steel assemblies comprises a first magnetic steel groove, a second magnetic steel groove and an air groove, and the first magnetic steel groove and the second magnetic steel groove are symmetrically arranged on two sides of the central line of each magnetic steel assembly; the air groove comprises side walls symmetrically arranged on two sides of the central line, the side walls and the outer wall of the adjacent first magnetic steel groove or the outer wall of the adjacent second magnetic steel groove form a first magnetic bridge, and the extension line of one side, far away from the rotating shaft through hole, of the side walls is intersected with the central line.
The technical scheme of the utility model, through set up the air groove on the rotor core of rotor, the air groove sets up including the symmetry the lateral wall of central line both sides, and make the lateral wall is kept away from the extension line of pivot through-hole one side with the central line is crossing, can optimize the centrifugal force distribution of rotor to the mechanical stress that can make magnetic bridge department is less than the yield stress of rotor core's silicon steel sheet material, has reduced the potential risk of rotor fracture inefficacy, from this alright through the mechanical strength who improves the motor, satisfies the high rotational speed demand of rotor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a structural view of an embodiment of a rotor according to the present invention;
FIG. 2 is an enlarged schematic view of a portion of the structure of the rotor of FIG. 1;
FIG. 3 is a schematic view of a rotor stress distribution of the motor of FIG. 1;
FIG. 4 is a schematic view of a rectangular air slot rotor stress distribution.
The reference numbers indicate:
| reference numerals | Name (R) | Reference numerals | Name(s) |
| 100 | |
50 | Second |
| 1 | |
60 | Magnetic isolation through |
| 11 | First |
70 | Magnetic |
| 12 | Second |
80 | Through hole of rotating |
| 20 | |
1000 | |
| 30 | First |
200 | |
| 41 | Fourth |
300 | Rotating shaft |
| 42 | Fifth magnetic steel groove |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, descriptions in the present application as to "first," "second," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a rotor core 100.
Referring to fig. 1 or fig. 2, in some embodiments of the rotor core 100 of the present invention, the rotor core 100 includes a plurality of sets of magnetic steel assemblies 1 disposed in equal parts in the circumferential direction thereof and a rotating shaft through hole 80 disposed in the center thereof, and the rotating shaft through hole 80 is used for sleeving the rotor core 100 on a rotating shaft 300;
each group of magnetic steel assemblies 1 comprises a first magnetic steel groove 11, a second magnetic steel groove 12 and an air groove 20, wherein the first magnetic steel groove 11 and the second magnetic steel groove 12 are symmetrically arranged on two sides of the center line of each magnetic steel assembly 1;
the air slot 20 includes side walls symmetrically disposed at two sides of the center line, the side walls and the outer wall of the first magnetic steel slot 11 or the second magnetic steel slot 12 adjacent to the side walls form a first magnetic bridge 30, and an extension line of one side of the side walls far away from the rotating shaft through hole 80 intersects the center line.
In this embodiment, rotor core 100 includes a plurality of sets of magnetic steel assemblies 1 arranged in equal parts in the circumferential direction and a rotating shaft through hole 80 arranged at the center thereof, the center line of magnetic steel assembly 1 passes through the middle point of rotating shaft 300, and rotating shaft through hole 80 is used for sleeving rotor core 100 on rotating shaft 300.
Specifically, the number of the magnetic steel components 1 can be set according to actual requirements, and the number of the magnetic steel components 1 can be even numbers, such as 4, 6, 8 and the like, so that the symmetry of the rotor is ensured. The utility model discloses explain with eight magnet steel assembly 1 groups, as shown in fig. 1, two sets of magnet steel assembly 1 arbitrary in eight magnet steel assembly 1 groups all are mutual symmetry, and the line of symmetry roughly through the central point of pivot through-hole 80.
Specifically, each group of magnetic steel assemblies 1 may include a first magnetic steel slot 11, a second magnetic steel slot 12 and an air slot 20, the first magnetic steel slot 11 and the second magnetic steel slot 12 are symmetrically disposed on two sides of a center line of the magnetic steel assemblies 1, and the first magnetic steel slot 11 and the second magnetic steel slot 12 may be used for mounting and limiting magnetic steel.
In some alternative embodiments, the first magnetic steel slots 11 and the second magnetic steel slots 12 are arranged to be gradually expanded from both sides of the air slots 20 to the outer edge of the rotor core 100. That is, the two magnet steel slots (the first magnet steel slot 11 and the second magnet steel slot 12) near the inner side of the rotor core 100 have the same shape, and the extending directions of the two magnet steel slots intersect with each other, and the two magnet steel slots are positioned in a V shape (or an inverted V shape) on the rotor core 100. For a rotor core 100, there are 8 magnetic steel assemblies 1 including V-shaped magnetic steel slot structures, and the shapes are completely the same, and each magnetic steel assembly 1 generates a magnetic pole.
Specifically, the air slot 20 may be a symmetrical structure with the center line of the magnetic steel assembly 1 as the center of symmetry, and is located between the first magnetic steel slot 11 and the second magnetic steel slot 12, and is disposed close to the rotating shaft through hole 80. The air slot 20 may include an upper wall, a lower wall and side walls symmetrically disposed at two sides of the central line, wherein two ends of the upper wall are respectively connected to end points of the two side walls far away from the through hole 80 of the rotating shaft, and two ends of the lower wall are respectively connected to end points of the two side walls near to the through hole 80 of the rotating shaft. The side wall of the air slot 20 and the outer wall of the adjacent first magnetic steel slot 11 or second magnetic steel slot 12 form a first magnetic bridge 30, and the extension line of one side of the side wall far away from the rotating shaft through hole 80 is intersected with the central line; the lower wall of the air slot 20 may be an arc structure with an opening facing the outer edge of the rotor core 100 in the following embodiment, or may be formed by sequentially connecting a plurality of line segments in the following embodiment, which is not described herein again.
Further, extension lines of both side walls of the air slot 20 may be tapered toward the outer edge of the rotor core 100. That is, the extending directions of both side walls of the air slot 20 intersect, and the position on the rotor core 100 is in an inverted "V" shape (or "eight" shape), that is, the extension lines of both side walls of the air slot 20 intersect with the extension lines of the first magnetic steel slot 11 or the second magnetic steel slot 12. It can be understood that the side walls are also intersected with the central line, and the intersection angle between the side walls and the central line may be positively correlated with the rotation speed of the rotor core 100, that is, the faster the rotation speed of the rotor core 100 is, the larger the intersection angle between the side walls and the central line is. Accordingly, the intersection angle between the sidewall and the central line may be set according to the rotation speed of the rotor core 100.
In some embodiments, the first magnetic steel slot 11 and the second magnetic steel slot 12 are disposed gradually expanding from both sides of the air slot 20 to the outer edge of the rotor core 100; the included angle α 1 between the first magnetic steel slot 11 or the second magnetic steel slot 12 and the center line of the magnetic steel assembly 1 may be any value from 35 ° to 50 °, that is, the included angle α 1 between the first magnetic steel slot 11 or the second magnetic steel slot 12 and the center line of the magnetic steel assembly 1 may be, but is not limited to, 35 °, 40 °, 45 °, 50 ° or the like; so set up, can make first magnetic steel groove 11 and second magnetic steel groove 12 use magnetic steel component 1's central line to be the V-arrangement symmetry setting as the center of symmetry, be favorable to promoting the magnetic effect of gathering of the interior magnet steel of magnetic steel component 1 to can improve motor 1000's power density, and still be favorable to reducing motor 1000 moment of torsion fluctuation, optimize load back electromotive force sine degree.
Wherein, be equipped with magnetic bridge h1, h2 of unequal thickness between the outer peripheral face of the one end of following and rotor core 100 of first magnetic steel groove 11 or second magnetic steel groove 12 orientation rotor core 100, magnetic bridge h2 is close to magnetic steel assembly 1's central line setting for magnetic bridge h1, and magnetic bridge h 2's thickness is less than magnetic bridge h1. Specifically, the thickness of the magnetic bridge h1 may be any value in the range of 0.8mm to 1.4mm, for example, the thickness of the magnetic bridge h1 may be, but is not limited to, a value of 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, etc.; the thickness of the magnetic bridge h2 can be any value in the range of 0.8mm to 1.3mm, for example, the thickness of the magnetic bridge h2 can be, but is not limited to, values of 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, and the like; it should be noted that the thickness of the magnetic bridge h2 should be smaller than that of the magnetic bridge h1, so as to distribute the centrifugal force more evenly, and the mechanical stress at the magnetic bridge is lower than the yield stress of the silicon steel sheet material of the magnetic bridge, thereby reducing the potential risk of fracture and failure of the rotor.
Of course, the technical solution of the present invention is not limited thereto, and in a possible implementation manner, the magnetic steel assembly 1 further includes a third magnetic steel slot perpendicular to the center line, as described in the following embodiments, and the third magnetic steel slot is disposed closer to the outer edge of the rotor core 100 than the air slot 20; the magnetic steel assembly 1 may further include a fourth magnetic steel slot 41 and a fifth magnetic steel slot 42 symmetrically disposed on two sides of the center line as described in the following embodiments, where the fourth magnetic steel slot 41 is closer to the outer edge of the rotor core 100 in the radial direction of the rotor core 100 than the first magnetic steel slot 11, and the fifth magnetic steel slot 42 is closer to the outer edge of the rotor core 100 in the radial direction of the rotor core 100 than the second magnetic steel slot 12; the specific implementation manner can be set according to actual requirements, and is not limited herein.
It should be noted that when the permanent magnet motor 1000 is operated at a high speed, the high-speed rotor in the motor 1000 is subjected to a high-speed centrifugal force impact, and therefore, the mechanical strength of the rotor needs to be ensured to reduce the potential risk of rotor fracture failure. A common arrangement is to use high-strength silicon steel sheets to improve the mechanical strength of the rotor and reduce the deformation of the rotor, but the high-strength silicon steel sheets are expensive, which increases the cost of the motor 1000; another common arrangement is to thicken the magnetic isolation bridge to make the rotor capable of bearing higher centrifugal force, but such an arrangement may cause increased leakage flux of the motor 1000, resulting in a decrease in torque output capability of the motor 1000.
Therefore, can understand, the technical scheme of the utility model, through set up the air groove 20 that has certain inclination lateral wall on the rotor core 100 of rotor, can be when the rotor of motor 1000 operates with 2w ~ 2.4 w's power high speed, more evenly optimize the centrifugal force distribution on the rotor to the mechanical stress that can make magnetic bridge department is less than the yield stress of the silicon steel sheet material of rotor core 100, the potential risk of rotor fracture inefficacy has been reduced, the high rotational speed demand of rotor can be satisfied to the mechanical strength who makes the rotor.
Referring to fig. 2, in some embodiments of the rotor core 100, an included angle between an extension line of the sidewall and the center line is in a range of 16 ° to 27 °.
In this embodiment, the air slots 20 are symmetrical structures taking the center line of the magnetic steel assembly 1 as a symmetrical center, and include side walls symmetrically disposed at both sides of the center line, and the included angle β 1 between the extension line of the side wall and the center line is any one of 16 ° to 27 °, that is, the included angle β 1 between the side wall and the center line of the magnetic steel assembly 1 may be, but is not limited to, 16 °, 17 °, 18 °, 19 °, 20 °, 21 °, 22 °, 23 °, 24 °, 25 °, 26 °, 27 °, and so on; with such arrangement, on one hand, the included angle β 1 between the side wall and the central line of the magnetic steel assembly 1 is not too large, so as to ensure that the rotor of the motor 1000 has better comprehensive performance and mechanical strength; on the other hand, the included angle β 1 between the side wall and the center line of the magnetic steel assembly 1 is not too small, so that the cross-sectional area of the polygonal air slot 20 can be ensured, the material consumption of the rotor core 100 can be reduced, the weight of the motor 1000 can be reduced, and the production cost of the motor 1000 can be reduced.
Referring to fig. 3 or fig. 4, fig. 3 is a schematic view of a stress distribution of a rotor of the motor 1000 of the present invention, and fig. 4 is a schematic view of a stress distribution of a rotor of a motor having rectangular air slots 20. It should be noted that, as shown in fig. 4, a rectangular air slot 20 is arranged on a rotor core 100 of a motor 1000, a first magnetic bridge 30 is formed by a side wall of the rectangular air slot 20 and an outer wall of an adjacent first magnetic steel slot 11 or second magnetic steel slot 12, a maximum stress at the first magnetic bridge 30 is 505MPa, and three stress concentrations are provided at the first magnetic bridge 20; as shown in fig. 3, the air slot 20 is disposed on the rotor core 100 of the motor 1000, the sidewall of the air slot 20 and the outer wall of the adjacent first magnetic steel slot 11 or second magnetic steel slot 12 form a first magnetic bridge 30, the maximum pressure of the first magnetic bridge 30 is 358MPa, and the stress distribution on the first magnetic bridge 30 is relatively uniform. Therefore, compare in setting up air slot 20 to the technical scheme of rectangle, the technical scheme of the utility model can optimize the stress distribution on the rotor more evenly, can make the mechanical stress of magnetic bridge department be less than the yield stress of the silicon steel sheet material of rotor core 100 from this to reduce the potential risk of rotor fracture inefficacy, improved the mechanical strength of rotor.
Referring to fig. 2, in some embodiments of the rotor core 100 of the present invention, the first magnetic bridges 30 are parallel magnetic bridges, and the thickness of the first magnetic bridges 30 is 1.0mm to 1.8mm.
In this embodiment, the first magnetic bridge 30 is a parallel magnetic bridge, and the thickness ω 1 of the first magnetic bridge 30 may range from 1.0mm to 1.8mm, for example, the thickness ω 1 of the first magnetic steel may be, but is not limited to, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, and the like; so set up, be favorable to improving reluctance torque, reduce the motor 1000 magnetic leakage.
Referring to fig. 2, in some embodiments of the inventive rotor core 100, the air slot 20 further includes a lower wall, two ends of the lower wall are respectively connected to the adjacent side walls, the lower wall is an arc-shaped structure, and an arc-shaped opening of the lower wall faces the outer edge of the rotor core 100.
In this embodiment, the air slots 20 are symmetrically arranged with the center line of the magnetic steel assembly 1 as a symmetric center, and the air slots 20 include side walls symmetrically arranged at both sides of the center line and a lower wall connected with an adjacent side wall; wherein, two ends of the lower wall of the air slot 20 are respectively connected with the adjacent side walls, the lower wall can be set to be an arc structure, and the arc opening of the arc structure faces the outer edge of the rotor core 100; so set up, be favorable to alleviateing rotor core 100's weight to can reduce rotor core 100 material cost, and can promote rotor speed through reducing rotor core 100 weight.
Referring to fig. 2, in some embodiments of the present invention rotor core 100, the air slots 20 further include a lower wall, and two ends of the lower wall are respectively connected to the adjacent side walls; the cross section of the lower wall is formed by sequentially connecting a plurality of line segments, wherein the connection point of the line segments is close to the rotating shaft through hole 80 compared with the connection point of the lower wall and the side wall.
In this embodiment, the air slots 20 are symmetrically arranged with the center line of the magnetic steel assembly 1 as a symmetric center, and the air slots 20 include side walls symmetrically arranged at both sides of the center line and a lower wall connected to an adjacent side wall; wherein, the section of the lower wall of the air groove 20 is formed by connecting a plurality of line segments in sequence, and the connection point of the line segments is close to the rotating shaft through hole 80 compared with the connection point of the lower wall and the side wall; it can be understood that, similar to the technical solution of setting the lower wall to be the arc-shaped structure in the foregoing embodiment, the technical solution of this embodiment is also beneficial to reducing the weight of the rotor core 100, so that the cost of the motor 1000 can be reduced, and the rotational speed of the rotor can be increased, which is not described herein again.
It should be noted that, the cross-section of lower wall is formed by many line segments connecting gradually, and many line segments can be many arc line segments, also can be many straightway, of course, the technical scheme of the utility model is not limited to this, and many line segments can also be formed by arc line segment and straightway connecting gradually, and concrete implementation mode can set up according to actual demand by oneself, does not do the restriction here.
Referring to fig. 2, in some embodiments of the present invention rotor core 100, the air slots 20 further include an upper wall perpendicular to the central line, and two ends of the upper wall are respectively connected to two end points of the side wall far from the side of the rotating shaft through hole 80.
In this embodiment, the air slot 20 is a symmetrical structure with the center line of the magnetic steel assembly 1 as a symmetrical center, and includes side walls symmetrically disposed at two sides of the center line of the magnetic steel assembly 1 and an upper wall having two ends respectively connected to end points of the two side walls far away from one side of the rotating shaft through hole 80, wherein the upper wall of the air slot 20 is perpendicular to the center line of the magnetic steel assembly 1; so set up, be favorable to optimizing the magnetic circuit of rotor.
Referring to fig. 2, in some embodiments of the inventive rotor core 100, the magnetic steel assembly 1 further includes a third magnetic steel slot perpendicular to the center line, and the third magnetic steel slot is closer to the outer edge of the rotor core 100 than the air slot 20.
In this embodiment, the magnetic steel assembly 1 further includes a third magnetic steel slot, the third magnetic steel slot is perpendicular to the center line of the magnetic steel assembly 1, and the third magnetic steel slot is closer to the outer edge of the rotor core 100 than the air slot 20; so set up, be favorable to improving the magnetic density of rotor to can improve the rotational speed of rotor.
Referring to fig. 2, in some embodiments of the inventive rotor core 100, the magnetic steel assembly 1 further includes a fourth magnetic steel slot 41 and a fifth magnetic steel slot 42 symmetrically disposed on two sides of the center line, wherein the fourth magnetic steel slot 41 is closer to the outer edge of the rotor core 100 than the first magnetic steel slot 11 in the radial direction of the rotor core 100, and the fifth magnetic steel slot 42 is closer to the outer edge of the rotor core 100 than the second magnetic steel slot 12 in the radial direction of the rotor core 100.
In this embodiment, the magnetic steel assembly 1 further includes a fourth magnetic steel slot 41 and a fifth magnetic steel slot 42 symmetrically disposed on two sides of the central line, where the fourth magnetic steel slot 41 is closer to the outer edge of the rotor core 100 in the radial direction of the rotor core 100 than the first magnetic steel slot 11, and the fifth magnetic steel slot 42 is closer to the outer edge of the rotor core 100 in the radial direction of the rotor core 100 than the second magnetic steel slot 12; a second magnetic bridge 50 is formed between the fourth magnetic steel groove 41 and the fifth magnetic steel groove 42, and the second magnetic bridge 50 is a parallel magnetic bridge.
Specifically, the distance ω 2 between one end of the air slot 20 facing the outer edge of the fourth magnetic steel slot 41 or the fifth magnetic steel slot 42 and the fourth magnetic steel slot 41 or the fifth magnetic steel slot 42 may be any value from 3mm to 7mm, that is, the distance ω 2 between the air slot 20 and the fourth magnetic steel slot 41 or the fifth magnetic steel slot 42 may be, but is not limited to, 3mm, 4mm, 5mm, 6mm, 7mm, and the like; the thickness ω 3 of the second magnetic bridge 50 may be any value in the range of 0.8mm to 1.4mm, for example, the thickness ω 3 of the second magnetic bridge 50 may be, but is not limited to, a value of 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, etc.; so set up, be favorable to improving reluctance torque, reduce motor 10001000 magnetic leakage.
In some embodiments, the fourth magnetic steel slot 41 and the fifth magnetic steel slot 42 are arranged from two sides of the air slot 20 to the outer edge of the rotor core 100; the included angle α 2 between the fourth magnetic steel slot 41 or the fifth magnetic steel slot 42 and the center line of the magnetic steel assembly 1 may be any value from 45 ° to 55 °, that is, the included angle α 2 between the fourth magnetic steel slot 41 or the fifth magnetic steel slot 41 and the center line of the magnetic steel assembly 1 may be, but is not limited to, 45 °, 50 °, 55 °, and the like; so set up, can make fourth magnet steel groove 41 and fifth magnet steel groove 42 can use magnetic steel component 1's central line to be the V-arrangement symmetry setting as the center of symmetry, be favorable to promoting the magnetic effect of gathering of the interior magnet steel of magnetic steel component 1 to can improve motor 1000's power density, and still be favorable to reducing motor 1000 moment of torsion fluctuation, optimize load back electromotive force sine degree.
Magnetic bridges h3 and h4 with different thicknesses are arranged between one end, facing the outer edge of the rotor core 100, of the fourth magnetic steel groove 41 or the fifth magnetic steel groove 42 and the outer peripheral surface of the rotor core 100, the magnetic bridges h4 are arranged close to the central line of the magnetic steel assembly 1 relative to the magnetic bridges h3, and the thickness of the magnetic bridges h4 is larger than that of the magnetic bridges h3. Specifically, the thickness of the magnetic bridge h3 may be any value in the range of 0.7mm to 1.1mm, for example, the thickness of the magnetic bridge h3 may be, but is not limited to, a value of 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.; the thickness of the magnetic bridge h4 can be any value in the range of 0.8mm to 1.5mm, for example, the thickness of the magnetic bridge h2 can be, but is not limited to, a value of 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, etc.; it should be noted that the thickness of the magnetic bridge h3 should be smaller than that of the magnetic bridge h4, so as to distribute the centrifugal force more evenly, and the mechanical stress at the magnetic bridge is lower than the yield stress of the silicon steel sheet material of the magnetic bridge, thereby reducing the potential risk of fracture failure of the rotor.
It should be noted that, by arranging the first magnetic steel slot 11 and the second magnetic steel slot 12 to be gradually expanded from both sides of the air slot 20 to the outer edge of the rotor core 100 as described in the foregoing embodiment, and arranging the third magnetic steel slot 41 and the fourth magnetic steel slot 41 to be gradually expanded from both sides of the air slot 20 to the outer edge of the rotor core 100 as described in the foregoing embodiment, and making the included angle between the fourth magnetic steel slot 41 and the fifth magnetic steel slot 42 larger than the included angle between the first magnetic steel slot 11 and the second magnetic steel slot 12, a multilayer V-shaped magnetic steel topological structure can be formed on the rotor; so be provided with and do benefit to and improve the magnet steel utilization ratio to can promote motor 1000's torque.
Referring to fig. 2, in some embodiments of the rotor core 100 of the present invention, the magnetic steel assembly further includes a magnetic isolation through hole 60 disposed between the fourth magnetic steel groove 41 and the fifth magnetic steel groove 42.
In this embodiment, the magnetic steel assembly 1 further includes a magnetic isolation through hole 60, and the magnetic isolation through hole 60 is disposed between the fourth magnetic steel groove 41 and the fifth magnetic steel groove 42, and is symmetrically disposed about the center line of the magnetic steel assembly 1. Specifically, the magnetic isolation through holes 60 may be configured as circular air slots 20, and the radius r1 of the circular air slots 20 is in a range from 1mm to 2mm, that is, the radius r1 of the circular air slots 20 may be, but is not limited to, 1mm, 1.5mm, 2mm, and the like; the distance between the top of the circular air groove 20 and the surface of the outer circle of the rotor is in the range of 1mm to 4mm, that is, the distance between the top of the circular air groove 20 and the outer circle of the rotor can be but is not limited to 1mm, 2mm, 3mm, 4mm and the like; the specific implementation manner can be set according to actual requirements, and is not limited herein.
It can be understood that the technical solution of the present invention, through setting up circular air groove 20 on rotor core 100, can optimize the rotor magnetic circuit to reduce the torque fluctuation of motor 1000, reduce the noise of motor 1000.
Referring to fig. 2, in some embodiments of the rotor core 100 of the present invention, the outer circumferential surface of the rotor core 100 is further provided with a magnetic flux modulating groove 70, and the shape formed by the magnetic flux modulating groove and the rotor surface is substantially triangular; by adjusting the size of the magnetic flux modulation slot 70 and the distribution position of the magnetic flux modulation slot on the surface of the rotor, the air gap flux density waveform can be optimized, and the high-order harmonic component in the counter electromotive force can be weakened, so that the torque fluctuation of the motor 1000 can be reduced, and the noise of the motor 1000 can be further reduced.
Specifically, the magnetic flux modulation slots 70 may be disposed on a center line of the magnetic steel assembly 1 and symmetrically disposed with the center line of the magnetic steel assembly 1 as a center, or the magnetic flux modulation slots 70 may be disposed in pairs, each pair of the magnetic flux modulation slots 70 being symmetrically disposed along the center line; by the arrangement, the air gap flux density waveform can be optimized better through the flux modulation groove 70, and the medium-high order harmonic component in counter electromotive force is weakened, so that the noise of the motor 1000 can be reduced better.
Of course, the technical solution of the present invention is not limited thereto. In some embodiments, a plurality of magnetic flux modulation grooves 70 are disposed on the outer circumferential surface of the rotor core 100, and the plurality of magnetic flux modulation grooves 70 may be disposed on the center line of the magnetic steel assembly 1, or may be disposed symmetrically in pairs with the center line of the magnetic steel assembly 1 as the symmetry center; the number of the magnetic flux modulation slots 70 arranged in pairs can be set according to actual requirements, for example, two or three pairs of magnetic flux modulation slots 70 are arranged in the region where each magnetic steel assembly 1 is located, and no limitation is made herein.
The utility model discloses still provide a motor 1000, this motor 1000 include stator 200, pivot 300 and any preceding embodiment rotor core 100, rotor core 100's concrete structure refers to any preceding embodiment. Since the motor 1000 provided by the present application can apply all technical solutions in all the aforementioned embodiments, at least all beneficial effects brought by the aforementioned technical solutions are provided, and details are not repeated herein.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A rotor core is characterized by comprising a plurality of groups of magnetic steel assemblies which are arranged in the circumferential direction in an equal-interval manner and a rotating shaft through hole which is arranged at the center of the rotor core, wherein the rotating shaft through hole is used for sleeving the rotor core on a rotating shaft;
each group of magnetic steel assemblies comprises a first magnetic steel groove, a second magnetic steel groove and an air groove, and the first magnetic steel groove and the second magnetic steel groove are symmetrically arranged on two sides of the center line of each magnetic steel assembly;
the air groove comprises side walls symmetrically arranged on two sides of the center line, the side walls and the outer wall of the first magnetic steel groove or the second magnetic steel groove close to the side walls form a first magnetic bridge, and an extension line of one side, far away from the rotating shaft through hole, of each side wall is intersected with the center line.
2. A rotor core according to claim 1, wherein the extension of the side walls makes an angle with the centre line in the range of 16 ° to 27 °.
3. The rotor core of claim 1, wherein the first magnetic bridges are parallel magnetic bridges, and the first magnetic bridges have a thickness of 1.0mm to 1.8mm.
4. The rotor core according to claim 1, wherein the air slot further comprises a lower wall, two ends of the lower wall are respectively connected to the adjacent side walls, the lower wall has an arc-shaped structure, and an arc-shaped opening of the lower wall faces the outer edge of the rotor core.
5. The rotor core of claim 1 wherein said air slots further comprise a lower wall, each end of said lower wall being connected to an adjacent one of said side walls; the section of the lower wall is formed by sequentially connecting a plurality of line segments, wherein the connection point of the line segments is close to the rotating shaft through hole compared with the connection point of the lower wall and the side wall.
6. The rotor core according to any one of claims 1 to 5, wherein the air slot further comprises an upper wall perpendicular to the center line, and both ends of the upper wall are respectively connected to end points of the two side walls on a side away from the through hole of the rotation shaft.
7. The rotor core of claim 1 wherein said magnetic steel assembly further comprises a third magnetic steel slot perpendicular to said centerline, said third magnetic steel slot being closer to an outer edge of said rotor core than said air slot.
8. The rotor core of claim 1, wherein the magnetic steel assembly further comprises a fourth magnetic steel slot and a fifth magnetic steel slot symmetrically disposed on opposite sides of the center line, wherein the fourth magnetic steel slot is closer to the outer periphery of the rotor core than the first magnetic steel slot in a radial direction of the rotor core, and the fifth magnetic steel slot is closer to the outer periphery of the rotor core than the second magnetic steel slot in the radial direction of the rotor core.
9. The rotor core of claim 8, wherein the magnetic steel assembly further comprises a magnetic isolation through hole disposed between the fourth magnetic steel slot and the fifth magnetic steel slot.
10. An electric machine comprising a stator, a rotating shaft and a rotor core according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221653558.6U CN217720856U (en) | 2022-06-29 | 2022-06-29 | Rotor core and motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221653558.6U CN217720856U (en) | 2022-06-29 | 2022-06-29 | Rotor core and motor |
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| CN217720856U true CN217720856U (en) | 2022-11-01 |
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| CN202221653558.6U Active CN217720856U (en) | 2022-06-29 | 2022-06-29 | Rotor core and motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116652027A (en) * | 2023-08-01 | 2023-08-29 | 苏州范斯特机械科技有限公司 | Rotor magnetic bridge blanking optimization method and rotor core production equipment |
-
2022
- 2022-06-29 CN CN202221653558.6U patent/CN217720856U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116652027A (en) * | 2023-08-01 | 2023-08-29 | 苏州范斯特机械科技有限公司 | Rotor magnetic bridge blanking optimization method and rotor core production equipment |
| CN116652027B (en) * | 2023-08-01 | 2023-09-22 | 苏州范斯特机械科技有限公司 | Rotor magnetic bridge blanking optimization method and rotor core production equipment |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: Suzhou Huichuan United Power System Co.,Ltd. Address before: 215104 No. 52, tiandang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. |
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| CP03 | Change of name, title or address |