Rotor assembly for motor and permanent magnet motor

Abstract

The utility model discloses a rotor assembly for a motor and a permanent magnet motor. The rotor assembly according to the utility model comprises a punching sheet body, a first magnetic member and a second magnetic member, wherein a first magnetic steel groove at the radial outer periphery and a second magnetic steel groove located at the radial inner periphery of the first magnetic steel groove are formed on the punching sheet body; wherein the plurality of second magnetic steel grooves are sequentially arranged in the circumferential direction, and the projection shapes of each second magnetic steel groove and the first magnetic steel groove in the thickness direction of the punching sheet body are the same; the first magnetic part is arranged in the first magnetic steel groove, the second magnetic part is arranged in the second magnetic steel groove, and the projection shapes of the first magnetic part and the second magnetic part in the thickness direction of the punching sheet body are the same. According to the rotor assembly provided by the utility model, the first magnetic steel grooves and the second magnetic steel grooves with the same size are arranged on the punching sheet body, so that the first magnetic piece and the second magnetic piece assembled on the rotor assembly are standardized, the universality of the rotor assembly is improved, and the cost of the rotor assembly is reduced.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a rotor assembly for motors and a permanent magnet motor. Background Art

[0002] In recent years, permanent magnet motors have been widely used as drive motors for new energy vehicles due to their small size, high power density, high efficiency, and low noise. In permanent magnet motors with inner rotor structures, permanent magnets are generally arranged on the rotor, but the permanent magnet arrangement structure in the prior art has large size differences, poor versatility, and high cost. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a rotor assembly for a motor. According to the rotor assembly of the utility model, by arranging a first magnetic steel slot and a second magnetic steel slot of the same size on the punching sheet body, the first magnetic part and the second magnetic part assembled in the rotor assembly are standardized, the size difference between the first magnetic part and the second magnetic part is reduced, and the versatility of the rotor assembly is improved and the cost of the rotor assembly is reduced.

[0004] The utility model also provides a permanent magnet motor comprising the rotor assembly.

[0005] According to the utility model, the rotor assembly includes a punching sheet body, a first magnetic component and a second magnetic component, wherein the punching sheet body is formed with a first magnetic steel groove on the radial outer circumference and a second magnetic steel groove located on the radial inner circumference of the first magnetic steel groove; wherein the second magnetic steel groove is constructed as a plurality of grooves arranged in sequence in the circumferential direction, and each of the second magnetic steel grooves has the same projection shape as the first magnetic steel groove in the direction of the thickness of the punching sheet body; the first magnetic component is arranged in the first magnetic steel groove, and the second magnetic component is arranged in the second magnetic steel groove, and the first magnetic component has the same projection shape as the second magnetic component in the direction of the thickness of the punching sheet body.

[0006] According to the rotor assembly of the utility model, a punching body is provided, and a first magnetic steel groove located at the radial outer circumference and a second magnetic steel groove located at the radial inner circumference are formed on the punching body, and the first magnetic steel groove and the second magnetic steel groove are respectively used to assemble the first magnetic part and the second magnetic part, wherein the second magnetic steel groove is constructed as a plurality of circumferentially spaced apart, and the shape and size of each second magnetic steel groove are the same as the shape and size of the first magnetic steel groove, therefore, the shape and size of the first magnetic part and the second magnetic part are also the same, and it can also be understood that each second magnetic steel groove has the same projection shape as the first magnetic steel groove in the direction of the thickness of the punching body, and the projection shape of the first magnetic part and the second magnetic part in the direction of the thickness of the punching body is the same. By arranging the first magnetic steel groove and the second magnetic steel groove of the same size on the punching body, the rotor assembly standardizes the first magnetic part and the second magnetic part assembled by the rotor assembly, reduces the size difference between the first magnetic part and the second magnetic part, thereby improving the versatility of the rotor assembly and reducing the cost of the rotor assembly.

[0007] According to one embodiment of the utility model, the rotor assembly also includes a first magnetic isolation bridge and a second magnetic isolation bridge, wherein the first magnetic isolation bridge is arranged at both ends of the first magnetic component; the second magnetic isolation bridge is arranged between two adjacent second magnetic steel slots and at the ends of the two second magnetic components facing away from each other.

[0008] According to one embodiment of the utility model, the first magnetic steel slot is constructed as a plurality of spaced-apart slots in the circumferential direction, and at least two adjacent first magnetic steel slots are inclined radially away from the center of the circle in a direction away from each other; the second magnetic steel slot is constructed as a plurality of spaced-apart slots in the circumferential direction, and at least two adjacent second magnetic steel slots are inclined radially away from the center of the circle in a direction away from each other, and at least another two adjacent second magnetic steel slots extend in the same direction.

[0009] According to an embodiment of the present invention, the distance between at least one of the first magnetic isolation bridges and the outer peripheral edge of the punching sheet body is d1, and satisfies: "1mm≤d1≤2mm".

[0010] According to an embodiment of the present invention, the distance between two adjacent first magnetic isolation bridges is d2, and satisfies: "1.5mm≤d2≤2mm".

[0011] According to an embodiment of the present invention, the width of at least one of the second magnetic isolation bridges is d3, and satisfies: "0.25mm≤d3≤0.5mm".

[0012] According to one embodiment of the utility model, two of the first magnetic steel slots and four of the second magnetic steel slots are together configured as a group of magnetic steel slot groups, and the magnetic steel slot assembly is constructed as a plurality of groups spaced apart in the circumferential direction of the punching sheet, and the number of the magnetic steel slot groups is an integer n, and n satisfies: "4≤n≤8".

[0013] According to one embodiment of the utility model, the rotor assembly also includes a first weight lightening hole and a second weight lightening hole, the first weight lightening hole is arranged between at least two adjacent second magnetic steel slots; the second weight lightening hole is arranged between two adjacent first weight lightening holes and is located radially inside the first weight lightening hole.

[0014] According to an embodiment of the utility model, a rotor shaft hole is formed at the center of the punch body, and a limiting protrusion is formed on the inner wall of the rotor shaft hole.

[0015] The permanent magnet motor according to the present utility model is briefly described below.

[0016] The permanent magnet motor according to the utility model includes the rotor assembly in the above-mentioned embodiment. Since the permanent magnet motor according to the utility model is provided with the rotor assembly in the above-mentioned embodiment, when the permanent magnet motor is assembled with the rotor assembly, the rotor assembly is standardized through the first magnetic steel slot and the second magnetic steel slot of the same size, thereby improving the versatility of the permanent magnet motor.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a structural diagram of a rotor assembly according to an embodiment of the utility model;

[0020] Figure 2 It is a partial schematic diagram of a rotor assembly according to an embodiment of the utility model.

[0021] Reference numerals:

[0022] Rotor assembly 1;

[0023] Film processing body 11;

[0024] The first magnetic steel slot 111 , the second magnetic steel slot 112 , the first magnetic isolation bridge 113 , the second magnetic isolation bridge 114 , the first weight reduction hole 115 , the second weight reduction hole 116 , the rotor shaft hole 117 , and the limiting protrusion 118 . DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0026] In recent years, permanent magnet motors have been widely used as drive motors for new energy vehicles due to their small size, high power density, high efficiency, and low noise. In permanent magnet motors with inner rotor structures, permanent magnets are generally arranged on the rotor, but the permanent magnet arrangement structure in the prior art has large size differences, poor versatility, and high cost.

[0027] Reference below Figure 1-Figure 2 A rotor assembly according to an embodiment of the present invention is described.

[0028] According to the utility model, the rotor assembly 1 includes a punching body 11, a first magnetic component and a second magnetic component. The punching body 11 is provided with a first magnetic steel groove 111 on the radial outer periphery and a second magnetic steel groove 112 located on the radial inner periphery of the first magnetic steel groove 111; wherein the second magnetic steel groove 112 is constructed as a plurality of grooves 112 arranged in sequence in the circumferential direction, and each second magnetic steel groove 112 has the same projection shape as the first magnetic steel groove 111 in the direction of the thickness of the punching body 11; the first magnetic component is arranged in the first magnetic steel groove 111, and the second magnetic component is arranged in the second magnetic steel groove 112, and the projection shape of the first magnetic component and the second magnetic component in the direction of the thickness of the punching body 11 is the same.

[0029] According to the rotor assembly 1 of the utility model, a punching body 11 is provided, and a first magnetic steel groove 111 located on the radial outer periphery and a second magnetic steel groove 112 located on the radial inner periphery are formed on the punching body 11, and the first magnetic steel groove 111 and the second magnetic steel groove 112 are respectively used to assemble the first magnetic part and the second magnetic part, wherein the second magnetic steel groove 112 is constructed to be a plurality of circumferentially spaced apart, and the shape and size of each second magnetic steel groove 112 are the same as the shape and size of the first magnetic steel groove 111, therefore, the shape and size of the first magnetic part and the second magnetic part are also the same, and it can also be understood that each second magnetic steel groove 112 has the same projection shape as the first magnetic steel groove 111 in the direction of the thickness of the punching body 11, and the projection shape of the first magnetic part and the second magnetic part in the direction of the thickness of the punching body 11 is the same. The rotor assembly 1 standardizes the first magnetic parts and the second magnetic parts assembled in the rotor assembly 1 by arranging the first magnetic steel groove 111 and the second magnetic steel groove 112 of the same size on the punching sheet body 11, thereby reducing the size difference between the first magnetic parts and the second magnetic parts, thereby improving the versatility of the rotor assembly 1 and reducing the cost of the rotor assembly 1.

[0030] According to an embodiment of the utility model, the rotor assembly 1 further includes a first magnetic isolation bridge 113 and a second magnetic isolation bridge 114. The first magnetic isolation bridge 113 is arranged at both ends of the first magnetic member; the second magnetic isolation bridge 114 is arranged between two adjacent second magnetic steel slots 112 and at the ends of the two second magnetic members facing away from each other. Specifically, the rotor assembly 1 is provided with a first magnetic isolation bridge 113 at both ends of the first magnetic member, and at the same time, the rotor assembly 1 is also provided with a second magnetic isolation bridge 114 between two adjacent second magnetic steel slots 112 and at the ends of two adjacent second magnetic members facing away from each other. The arrangement of the first magnetic isolation bridge 113 and the second magnetic isolation bridge 114 can reduce the magnetic leakage of the rotor assembly 1.

[0031] According to one embodiment of the utility model, the first magnetic steel slots 111 are constructed as a plurality of circumferentially spaced apart slots, and at least two adjacent first magnetic steel slots 111 are radially away from the center of the circle and tilted in a direction away from each other; the second magnetic steel slots 112 are constructed as a plurality of circumferentially spaced apart slots, and at least two adjacent second magnetic steel slots 112 are radially away from the center of the circle and tilted in a direction away from each other, and at least another two adjacent second magnetic steel slots 112 extend in the same direction.

[0032] Since the first magnetic steel slot 111 and the second magnetic steel slot 112 are structures of the rotor assembly 1 for assembling the first magnetic part and the second magnetic part respectively, the structure of the second magnetic steel slot 112 and the second magnetic steel slot 112 will affect the use of the rotor assembly 1. Specifically, the first magnetic steel slot 111 is configured as a plurality of spaced apart in the circumferential direction, and two adjacent first magnetic steel slots 111 are arranged radially away from the center of the circle in a direction away from each other and tilted. It can be understood that the two adjacent first magnetic steel slots 111 are symmetrical to each other and tilted to the axis of symmetry, so that the two adjacent first magnetic steel slots 111 cooperate to form a "V"-shaped structure. The second magnetic steel slot 112 is configured as a plurality of spaced apart in the circumferential direction, and at least two adjacent second magnetic steel slots 112 are arranged radially away from the center of the circle in a direction away from each other and tilted. Similarly, the arrangement of the second magnetic steel slot 112 can also be understood as the two adjacent first magnetic steel slots 111 are symmetrical to each other and tilted to the axis of symmetry, so that the two adjacent second magnetic steel slots 112 cooperate to form a "V"-shaped structure. In addition, at least two other adjacent second magnetic steel slots 112 extend in the same direction, and it can be understood that the two second magnetic steel slots 112 are connected to each other and are symmetrically arranged with the second magnetic steel slots 112 that are connected to each other. It is worth noting that the symmetry axis of the second magnetic steel slot 112 is coaxial with the symmetry axis of the first magnetic steel slot 111. The position layout of the first magnetic steel slot 111 and the second magnetic steel slot 112 makes the magnetic steel slot on the punching sheet body 11 present a double "V" shape structure, which can reduce the torque density of the rotor assembly 1 and facilitate the arrangement of the first magnetic part and the second magnetic part on the punching sheet body 11.

[0033] According to an embodiment of the utility model, the distance between at least one first magnetic isolation bridge 113 and the outer peripheral edge of the punch body 11 is d1, and satisfies: "1mm≤d1≤2mm". During processing, the distance between the first magnetic isolation bridge 113 located at one end of the first magnetic steel slot 111 close to the outer peripheral edge of the punch body 11 and the outer peripheral edge of the punch body 11 is d1, and d1 can satisfy 1mm≤d1≤2mm. The setting of d1 can reduce leakage magnetic flux while ensuring the structural strength of the first magnetic steel slot 111 and the punch body 11.

[0034] According to an embodiment of the utility model, the distance between two adjacent first magnetic isolation bridges 113 is d2, and satisfies: "1.5mm≤d2≤2mm". The distance between two adjacent first magnetic isolation bridges 113 is set to d2, and d2 can satisfy 1.5mm≤d2≤2mm. The setting of d2 can ensure the structural strength of the connection between two adjacent first magnetic steel slots 111. At the same time, under the premise of ensuring the connection strength, the smaller d2 is, the better the performance of preventing magnetic leakage is. The setting of d2 can reduce the amount of magnetic leakage between two adjacent first magnetic steel slots 111.

[0035] According to an embodiment of the present invention, the width of at least one second magnetic isolation bridge 114 is d3, and satisfies: "0.25mm≤d3≤0.5mm". The width of the second magnetic isolation bridge 114 between two adjacent second magnetic steel slots 112 is d3, and d3 satisfies 0.25mm≤d3≤0.5mm. During processing, the setting of d3 can ensure the connection strength between the adjacent second magnetic steel slots 112, and at the same time, can also reduce the leakage magnetic flux between the two adjacent second magnetic steel slots 112.

[0036] According to one embodiment of the utility model, the two first magnetic steel slots 111 and the four second magnetic steel slots 112 are together configured as a group of magnetic steel slot groups. The magnetic steel slot assembly is constructed as a plurality of groups spaced apart in the circumferential direction of the punching sheet. The number of magnetic steel slot groups is an integer n, and n satisfies: "4≤n≤8".

[0037] Specifically, two adjacent magnetic steel slots are symmetrical and tilted toward the axis of symmetry, wherein two adjacent second magnetic steel slots 112 are symmetrical and tilted toward the axis of symmetry, wherein the other two adjacent second magnetic steel slots 112 extend in the same direction, which can be understood as: four second magnetic steel slots 112 and two first magnetic steel slots 111 form a group of magnetic steel slot groups similar to the upper "V" shape. During processing, n groups of magnetic steel slot groups can be set on the punch body 11, wherein n satisfies 4≤n≤8. For example, during actual processing, n can be 6, i.e., 6 groups of magnetic steel slot groups can be set on the punch body 11. In any group of magnetic steel slot groups, the angle between the two first magnetic steel slots 111 can be 135°, and the angle between the two symmetrical second magnetic steel slots 112 can be 95°. The angle setting of the magnetic steel slot can be set according to the number of magnetic steel slot groups actually processed.

[0038] According to one embodiment of the utility model, the rotor assembly 1 also includes a first weight lightening hole 115 and a second weight lightening hole 116. The first weight lightening hole 115 is arranged between at least two adjacent second magnetic steel slots 112; the second weight lightening hole 116 is arranged between two adjacent first weight lightening holes 115 and is located radially inside the first weight lightening hole 115.

[0039] During processing, the rotor assembly 1 can process the first weight-reducing hole 115 and the second weight-reducing hole 116 on the punching body 11 to reduce the weight of the punching body 11. Specifically, the first weight-reducing hole 115 is located between two adjacent and symmetrical second magnetic steel slots 112 in one magnetic steel group, and the second weight-reducing hole 116 can be arranged between two adjacent first weight-reducing holes 115 and located radially inside the first weight-reducing hole 115. The arrangement of the first weight-reducing hole 115 and the second weight-reducing hole 116 reduces the weight of the punching body 11 and achieves lightweight.

[0040] In some embodiments, the first weight-reducing hole 115 can be constructed as a rectangular hole. Under the premise of achieving weight reduction, the distance between the second magnetic isolation bridge 114 and the weight-reducing hole is reduced, thereby reducing the magnetic leakage at one end of the second magnetic steel slot 112 close to the first weight-reducing hole 115. The second weight-reducing hole 116 can be constructed as a triangular hole. The second weight-reducing hole 116 is arranged radially inward of the first weight-reducing hole 115. Therefore, the second weight-reducing hole 116 is closer to the center of the punch body 11. The size of the second weight-reducing hole 116 is smaller than that of the first weight-reducing hole 115, which can avoid interference with the magnetic circuit.

[0041] According to an embodiment of the utility model, a rotor shaft hole 117 is formed at the center of the punch body 11, and a limiting protrusion 118 is formed on the inner wall of the rotor shaft hole 117. During assembly, the rotor shaft hole 117 is provided at the center of the punch body 11, and the rotor shaft hole 117 can be fixed with the rotating shaft of the rotor assembly 1, and a limiting protrusion 118 is formed on the inner wall of the rotor shaft hole 117, and the limiting protrusion 118 can be limitedly matched with the rotating shaft of the rotor assembly 1, thereby improving the stability of the assembly of the rotor assembly 1.

[0042] The permanent magnet motor according to the present utility model is briefly described below.

[0043] The permanent magnet motor according to the utility model includes the rotor assembly 1 in the above embodiment. Since the permanent magnet motor according to the utility model is provided with the rotor assembly 1 in the above embodiment, when the permanent magnet motor is assembled with the rotor assembly 1, the rotor assembly 1 is standardized through the first magnetic steel slot 111 and the second magnetic steel slot 112 of the same size, thereby improving the versatility of the permanent magnet motor.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0046] In the description of the present invention, "plurality" means two or more.

[0047] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0048] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotor assembly for a motor, characterized in that: include: A punching sheet body, on which a first magnetic steel groove located on the radial outer periphery and a second magnetic steel groove located on the radial inner periphery of the first magnetic steel groove are formed; in The second magnetic steel groove is configured to be a plurality of grooves arranged in sequence in the circumferential direction, and each of the second magnetic steel grooves has the same projection shape as the first magnetic steel groove in the direction of the thickness of the punching sheet body; A first magnetic member and a second magnetic member, wherein the first magnetic member is disposed in the first magnetic steel groove, and the second magnetic member is disposed in the second magnetic steel groove, and the projection shapes of the first magnetic member and the second magnetic member in the direction of the thickness of the punching sheet body are the same.

2. The rotor assembly according to claim 1, characterized in that Also includes: A first magnetic isolation bridge, wherein the first magnetic isolation bridge is disposed at two ends of the first magnetic member; A second magnetic isolation bridge is arranged between two adjacent second magnetic steel grooves and at ends of two second magnetic members facing away from each other.

3. The rotor assembly according to claim 2, characterized in that: The first magnetic steel slots are configured to be a plurality of slots spaced apart in the circumferential direction, and at least two adjacent first magnetic steel slots are tilted away from the center of the circle in a direction away from each other. The second magnetic steel slots are constructed to be a plurality of slots spaced apart in the circumferential direction, wherein at least two adjacent second magnetic steel slots are inclined away from the center of the circle in a direction away from each other, and at least another two adjacent second magnetic steel slots extend in the same direction.

4. The rotor assembly according to claim 2, characterized in that: The distance between at least one of the first magnetic isolation bridges and the outer peripheral edge of the punch body is d1, and satisfies: "1mm≤d1≤2mm".

5. The rotor assembly according to claim 2, characterized in that: The distance between two adjacent first magnetic isolation bridges is d2, and satisfies: "1.5mm≤d2≤2mm".

6. The rotor assembly according to claim 2, characterized in that: The width of at least one of the second magnetic isolation bridges is d3 and satisfies: "0.25mm≤d3≤0.5mm".

7. The rotor assembly according to claim 3, characterized in that: The two first magnetic steel slots and the four second magnetic steel slots are together configured as a magnetic steel slot group, and the magnetic steel slot assembly is constructed as a plurality of groups spaced apart in the circumferential direction of the punching sheet, and the number of the magnetic steel slot groups is an integer n, and n satisfies: "4≤n≤8".

8. The rotor assembly according to claim 3, characterized in that: Also includes: a first weight-reducing hole, wherein the first weight-reducing hole is disposed between at least two adjacent second magnetic steel slots; The second weight-reducing hole is arranged between two adjacent first weight-reducing holes and is located radially inward of the first weight-reducing holes.

9. The rotor assembly according to claim 1, characterized in that: A rotor shaft hole is formed at the center of the punch body, and a limiting protrusion is formed on the inner wall of the rotor shaft hole.

10. A permanent magnet motor, characterized in that: The invention comprises the punching sheet as described in any one of claims 1 to 9.

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