Rotor assembly and motor

Abstract

The invention provides a rotor assembly and a motor, the rotor assembly comprises a rotor iron core, the rotor iron core comprises a plurality of block iron cores, the plurality of block iron cores are arranged at intervals in the circumferential direction of the rotor iron core, a first magnetic steel groove is formed between two adjacent block iron cores, and first magnetic steel is arranged in the first magnetic steel groove. According to the invention, the technical problem in the prior art that the magnetization direction of the rotor permanent magnet is approximately vertical to the air gap flux axis and is far away from the air gap, resulting in large magnetic flux leakage of the tangential magnetic circuit structure can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a rotor assembly and a motor. Background Art

[0002] The traditional rotor design adopts a hybrid magnetic circuit structure, which can place more permanent magnets under a certain rotor diameter, provide higher air gap flux density, or reduce the rotor volume under the same air gap flux density. However, it is inevitable that the tangential magnetic circuit part in the hybrid magnetic circuit structure provides per-pole flux to the air gap by two permanent magnet cross sections, which can improve the air gap flux density, which is more prominent when there are more poles. However, the magnetization direction of the permanent magnet is nearly perpendicular to the air gap flux axis and is far away from the air gap, making the tangential magnetic circuit structure have greater leakage than the axial and radial types, resulting in insufficient utilization of permanent magnets. At the same time, when the rotor of the integrated structure is damaged, the entire rotor needs to be replaced, resulting in high maintenance costs and inconvenient maintenance.

[0003] Since the magnetization direction of the rotor permanent magnet in the prior art is nearly perpendicular to the air gap magnetic flux axis and is far away from the air gap, there are technical problems such as large magnetic leakage in the tangential magnetic circuit structure. Therefore, the present invention studies and designs a rotor assembly and a motor. Summary of the invention

[0004] Therefore, the present invention provides a rotor assembly and a motor, which can solve the technical problem in the prior art that the magnetization direction of the rotor permanent magnet is nearly perpendicular to the air gap flux axis and is far away from the air gap, resulting in large magnetic leakage in the tangential magnetic circuit structure.

[0005] In order to solve the above problems, the present invention provides a rotor assembly, including: a rotor core, the rotor core including a plurality of block cores, the plurality of block cores are arranged at intervals in the circumferential direction of the rotor core, a first magnetic steel slot is formed between two adjacent block cores, and a first magnetic steel is arranged in the first magnetic steel slot.

[0006] In some embodiments, along the radial direction of the rotor core, the center line of the segmented core is the d-axis, the center line of the gap between two adjacent segmented cores is the q-axis, the first magnetic steel slot is symmetrical about the q-axis, and the number of the segmented cores is 2n, where n is a positive integer.

[0007] In some embodiments, a second magnetic steel slot is disposed at the end of the segmented iron core, the second magnetic steel slot is symmetrical about the d-axis, and a second magnetic steel is disposed in the second magnetic steel slot.

[0008] In some embodiments, the second magnetic steel slot is in any one of an I-shape, a V-shape and a U-shape, and when the second magnetic steel slot is in a V-shape or a U-shape, the opening of the second magnetic steel slot faces the outer peripheral wall of the rotor core.

[0009] In some embodiments, a slot is provided at the end of the segmented iron core, and in two adjacent segmented iron cores, one side of the slot passes through the side wall of one segmented iron core toward the other segmented iron core, and the slot is close to the outer peripheral wall of the rotor core relative to the first magnetic steel. Baffles are provided at both ends of the rotor core, and buckles are provided on the baffles, and the buckles are connected to the slots.

[0010] In some embodiments, the slots of two adjacent segmented cores form a fixed slot, and taking the cross section of the rotor core as a projection surface, the fixed slot matches the buckle, and the buckle is plugged into the fixed slot.

[0011] In some embodiments, the maximum radius of the rotor core is R1, and the maximum radius of the baffle is R2, which satisfies R1 ≥ R2 + 0.5 mm.

[0012] In some embodiments, the rotor core has a first axial hole, the baffle is provided with a second axial hole, the first axial hole and the second axial hole are arranged opposite to each other, and the radii of the first axial hole and the second axial hole are both R3.

[0013] In some embodiments, a plurality of second connection holes are provided on the baffle, a first connection hole is provided on the segmented iron core, and the second connection holes correspond to the first connection holes one by one.

[0014] The present invention also provides a motor, which comprises the above-mentioned rotor assembly.

[0015] A rotor assembly and a motor provided by the present invention have the following beneficial effects:

[0016] A first magnetic steel slot is formed between two adjacent segmented iron cores, in which a first magnetic steel is arranged. The first magnetic steel generates a tangential partial magnetic circuit. Since there is no silicon steel core connection between adjacent segmented iron cores, the tangential partial magnetic circuit must pass through an air path to form a leakage magnetic circuit, and the magnetic lines of force take the path with the smallest magnetic resistance, thereby achieving the effect of greatly reducing leakage magnetic flux. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] Figure 1 is a schematic structural diagram of a rotor assembly of the present invention;

[0019] Figure 2 is a schematic structural diagram of a rotor in a rotor assembly of the present invention;

[0020] Figure 3 is a schematic structural diagram of a baffle in a rotor assembly of the present invention;

[0021] Figure 4 is a schematic diagram of the end surface structure of the rotor assembly of the present invention;

[0022] Figure 5 is a schematic structural diagram of a rotor in a rotor assembly according to another embodiment of the present invention;

[0023] Figure 6 It is a partial enlarged view of the rotor assembly of the present invention.

[0024] The accompanying drawings are marked as follows:

[0025] 1. Block core; 2. First axial hole; 3. Card slot; 4. First magnetic steel slot; 5. Baffle; 6. First connecting hole; 7. Second magnetic steel slot; 8. Second magnetic steel; 9. First magnetic steel; 10. Second connecting hole; 11. Second axial hole; 12. Buckle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0030] See also Figure 1-6 As shown, according to an embodiment of the present invention, a rotor assembly is provided, comprising: a rotor core, the rotor core comprising a plurality of segmented cores 1, the plurality of segmented cores 1 being arranged at intervals in the circumferential direction of the rotor core, a first magnetic steel slot 4 being formed between two adjacent segmented cores 1, and a first magnetic steel 9 being arranged in the first magnetic steel slot 4. In this technical solution, a first magnetic steel slot 4 is formed between two adjacent segmented cores 1, a first magnetic steel 9 is arranged in the first magnetic steel slot 4, and the first magnetic steel 9 generates a tangential partial magnetic circuit. Since there is no silicon steel core connection between adjacent segmented cores 1, the tangential partial magnetic circuit must pass through an air path to form a leakage magnetic circuit, and the magnetic lines of force take the path with the smallest magnetic resistance, so as to achieve the effect of greatly reducing leakage magnetic.

[0031] In some embodiments, along the radial direction of the rotor core, the center line of the segmented core 1 is the d-axis, the center line of the gap between two adjacent segmented cores 1 is the q-axis, the first magnetic steel slot 4 is symmetrical about the q-axis, and the segmented core 1 is 2n, where n is a positive integer. In this technical solution, the first magnetic steel slot 4 is symmetrical about the q-axis, making full use of the space between two adjacent segmented cores 1, improving the air gap magnetic density and achieving the effect of improving the efficiency of the motor.

[0032] In some embodiments, a second magnetic steel slot 7 is provided at the end of the segmented core 1, the second magnetic steel slot 7 is symmetrical about the d-axis, and a second magnetic steel 8 is provided in the second magnetic steel slot 7. In this technical solution, the second magnetic steel slot 7 is symmetrical about the d-axis to ensure uniform and symmetrical air gap magnetic flux density.

[0033] In some embodiments, the second magnetic steel slot 7 is in any one of a straight line, a V-shaped and a U-shaped shape, and when the second magnetic steel slot 7 is in a "V" shape or a "U" shape, the opening of the second magnetic steel slot 7 faces the outer peripheral wall of the rotor core. In this technical solution, the second magnetic steel slot 7 is in any one of a straight line, a V-shaped and a U-shaped shape, and when the second magnetic steel slot 7 is in a "V" shape or a "U" shape, combined with reference to Figure 5 As shown, of course, the second magnetic steel slot 7 can also adopt other shapes, as long as the second magnetic steel slot 7 is symmetrical about the d axis. The second magnetic steel slot 7 is located on the synthetic magnetic circuit generated by the first magnetic steel slots 4 on both sides, and its magnetic pole direction is the same as the synthetic magnetic circuit generated by the tangential magnetic steels on both sides, which guides and superimposes the tangential synthetic magnetic circuit, so that the main magnetic circuit can more effectively interlink with the stator magnetic field to generate a higher torque. Furthermore, the second magnetic steel slot 7 is "V"-shaped. Through reasonable design of the V-shape, more magnetic steels can be placed, which improves the efficiency of the motor to a certain extent, and the radial outer side of the V-shaped magnetic steel has more space to design magnetic isolation holes while taking into account mechanical strength, thereby improving performance such as vibration and noise.

[0034] In some embodiments, a slot 3 is provided at the end of the segmented core 1. In two adjacent segmented cores 1, one side of the slot 3 penetrates the side wall of one segmented core 1 toward the other segmented core 1. The slot 3 is close to the outer peripheral wall of the rotor core relative to the first magnetic steel 9. Baffles 5 are provided at both ends of the rotor core. Buckles 12 are provided on the baffles 5, and the buckles 12 are connected to the slot 3. In this technical solution, baffles 5 are provided at both ends of the rotor core. Buckles 12 are provided on the baffles 5, and the buckles 12 are connected to the slot 3. The segmented core 1 is fixed by the baffles 5 to form a completed rotor core. Since the first magnetic steel slot 4 is formed by an open gap, the first magnetic steel 9 placed therein may move radially outward of the rotor due to centrifugal force during the rotation of the rotor and eventually detach from the rotor. To avoid such a phenomenon, a slot 3 and a buckle 12 are provided on the radial outer side of the first magnetic steel slot 4, and the two cooperate with each other to limit the radial movement of the first magnetic steel slot 4. Preferably, the shape of the baffle 5 can be any shape that meets the requirements.

[0035] In some embodiments, the slots 3 of two adjacent segmented cores 1 form a fixed slot, and with the cross section of the rotor core as the projection surface, the fixed slot matches the buckle 12, and the buckle 12 is plugged into the fixed slot. In this technical solution, the shape of the slot 3 can be a triangle, with the top of the triangle facing the outer peripheral wall of the rotor core, and the slots 3 of two adjacent segmented cores 1 form a fixed slot, and the fixed slot is an isosceles trapezoid. The buckle 12 and the fixed slot have the same shape and size. The buckle 12 is an isosceles trapezoidal column, and the bottom side of the trapezoid close to the first magnetic steel 9 is a1, and the bottom side of the trapezoid away from the first magnetic steel 9 is a2, which satisfies a1>a2, that is, when squeezed from the long side to the short side, the buckle 12 shares the force for the segmented cores 1 on both sides, and it is not easy for the buckle 12 to deform radially outward. On the contrary, when the segmented cores 1 on both sides are squeezed from the short side to the long side, no force is applied, which easily causes the baffle buckle 12 to deform and bend radially outward. In conjunction with reference to Figure 6 As shown, further, the slot 3 may also adopt other shapes, as long as the buckle 12 matches the fixing slot. The height of the rotor core is H1, the length of the buckle 12 is H2, and 2·H2+5mm=H1 is required. The buckle 12 and the slot 3 correspond to each other one by one, providing a certain fixing effect for the 2n segmented cores 1 to be assembled into a full circle, and at the same time preventing the magnetic steel placed in the first magnetic steel slot 4 from moving outward and detaching from the rotor due to centrifugal force when the rotor rotates at high speed.

[0036] In some embodiments, the maximum radius of the rotor core is R1, and the maximum radius of the baffle 5 is R2, which satisfies R1≥R2+0.5mm. In this technical solution, the maximum radius of the rotor core is R1, and the maximum radius of the baffle 5 is R2, which satisfies R1≥R2+0.5mm. If the baffle 5 is too large, it may scrape the inner wall of the stator, and there will be errors in processing. For safety reasons, the radius of the baffle 5 is set not larger than the radius of the rotor core.

[0037] In some embodiments, the rotor core has a first shaft hole 2, the baffle 5 is provided with a second shaft hole 11, the first shaft hole 2 and the second shaft hole 11 are arranged opposite to each other, and the radius of the first shaft hole 2 and the second shaft hole 11 are both R3. In this technical solution, the first shaft hole 2 and the second shaft hole 11 are arranged opposite to each other, and the radius of the first shaft hole 2 and the second shaft hole 11 are both R3. It is ensured that the shaft can rotate normally and the baffle 5 is prevented from affecting the shaft.

[0038] When the rotor assembly of the present invention is applied to a motor, it solves the problems of excessive leakage magnetic flux in the tangential part and insufficient utilization of permanent magnets in the hybrid magnetic circuit structure, and also solves the problem of high rotor maintenance cost. Compared with the existing rotors, the rotor assembly of the present invention reduces the leakage magnetic flux of the hybrid rotor magnetic circuit structure, improves the utilization rate of the magnetic steel, and increases the motor efficiency. When damage occurs to the block-type rotor, only the corresponding rotor block needs to be replaced, instead of replacing the whole rotor, which saves costs.

[0039] In some embodiments, a plurality of second connection holes 10 are provided on the baffle 5, and first connection holes 6 are provided on the segmented iron core 1. The second connection holes 10 correspond to the first connection holes 6 one by one. In this technical solution, the baffle 5 and the segmented iron core 1 can be connected by screws through the second connection holes 10 and the first connection holes 6, and the mutual cooperation of the baffle 5 and the segmented iron core 1 can play a certain fixing role in the overall assembly of the rotor.

[0040] In some embodiments, the center of the circle of the first connection hole 6 is located on the d-axis, and the distance between the center of the circle of the first connection hole 6 and the center of the circle of the rotor iron core is L1. The radius of the complete rotor composed of several segmented iron cores 1 is R, and it is required that 0.63R < L1 < 0.68R. Limiting within a fixed range ensures that the opening of the screw holes will not have a great impact on the rotor magnetic circuit, and the specific size of L1 is determined according to the usage situation.

[0041] The present invention also provides a motor, including the above-mentioned rotor assembly.

[0042] For the motor of the present invention, by adopting the above-mentioned rotor assembly, when damage occurs during use, only the corresponding segmented iron core 1 needs to be replaced, which reduces the maintenance cost.

[0043] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above-mentioned various embodiments can be freely combined and superimposed.

[0044] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and variations can be made, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: include: A rotor core, the rotor core comprising a plurality of segmented cores (1), the plurality of segmented cores (1) being arranged at intervals in the circumferential direction of the rotor core, a first magnetic steel slot (4) being formed between two adjacent segmented cores (1), and a first magnetic steel (9) being arranged in the first magnetic steel slot (4).

2. The rotor assembly according to claim 1, characterized in that: Along the radial direction of the rotor core, the center line of the segmented core (1) is the d-axis, the center line of the gap between two adjacent segmented cores (1) is the q-axis, the first magnetic steel slot (4) is symmetrical about the q-axis, and the number of the segmented cores (1) is 2n, where n is a positive integer.

3. The rotor assembly according to claim 2, characterized in that: A second magnetic steel slot (7) is provided at the end of the segmented iron core (1), the second magnetic steel slot (7) is symmetrical about the d-axis, and a second magnetic steel (8) is provided in the second magnetic steel slot (7).

4. The rotor assembly according to claim 3, characterized in that: The second magnetic steel slot (7) is in any one of an "I" shape, a "V" shape and a "U" shape, and when the second magnetic steel slot (7) is in a "V" shape or a "U" shape, the opening of the second magnetic steel slot (7) faces the outer peripheral wall of the rotor core.

5. The rotor assembly according to claim 1, characterized in that: A slot (3) is provided at the end of the segmented iron core (1); in two adjacent segmented iron cores (1), one side of the slot (3) passes through the side wall of one segmented iron core (1) toward the other segmented iron core (1); the slot (3) is close to the outer peripheral wall of the rotor iron core relative to the first magnetic steel (9); baffles (5) are provided at both ends of the rotor iron core; a buckle (12) is provided on the baffle (5); and the buckle (12) is connected to the slot (3).

6. The rotor assembly according to claim 5, characterized in that: The clamping grooves (3) of two adjacent segmented iron cores (1) form a fixed groove, with the cross section of the rotor iron core as the projection surface, the fixed groove matches the clamp (12), and the clamp (12) is plugged into the fixed groove.

7. The rotor assembly according to claim 5, characterized in that: The maximum radius of the rotor core is R1, and the maximum radius of the baffle (5) is R2, which satisfies R1≥R2+0.5mm.

8. The rotor assembly according to claim 5, characterized in that: The rotor core is provided with a first axial hole (2), the baffle (5) is provided with a second axial hole (11), the first axial hole (2) and the second axial hole (11) are arranged opposite to each other, and the radii of the first axial hole (2) and the second axial hole (11) are both R3.

9. The rotor assembly according to claim 5, characterized in that: The baffle (5) is provided with a plurality of second connection holes (10), the segmented iron core (1) is provided with a first connection hole (6), and the second connection holes (10) correspond one-to-one to the first connection holes (6).

10. A motor, characterized in that: A rotor assembly comprising any one of claims 1 to 9.

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