Rotor stacked rotor

Abstract

This application relates to the field of motor technology and discloses a rotor stack and rotor. The rotor stack includes multiple first rotor laminations and second rotor laminations. The first and second rotor laminations respectively form multiple first and second magnet slots for accommodating magnets. The first and second magnet slots are axially offset and interconnected, such that the first sidewall of the first magnet slot abuts against the first sidewall of the magnet, and the sixth sidewall of the second magnet slot abuts against the second sidewall of the magnet. The distance between the first and sixth sidewalls is equal to the thickness of the magnet, thereby fixing the magnets without the need for resin potting in the magnet slots, reducing rotor production costs and improving rotor production efficiency. It also avoids magnet damage due to stress concentration. The gap formed between the sidewall of the magnet slot and the sidewall of the magnet constitutes part of the rotor cooling channel, allowing the magnets to be directly cooled by the cooling medium, avoiding demagnetization caused by high temperatures.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically to a rotor stack and rotor. Background Technology

[0002] The rotor of existing permanent magnet motors is fixed to the magnets by potting epoxy glue or injection molding nylon resin, which is not only costly but also takes a long time to produce.

[0003] Chinese patent CN221177390U discloses a rotor lamination with protrusions, a motor rotor, a motor, and a power assembly. It uses protrusions in the magnet slots to fix the magnets after they are inserted, through deformation. The drawback of this solution is that it still requires injection molding to fix the magnets. In actual testing, the inventors found that without injection molding, the protrusions easily cause cracks or even damage to the magnets. Furthermore, with rotor operation, the long-term deformed protrusions are prone to fatigue and loss of elasticity, causing the magnets to shift within the magnet slots. Summary of the Invention

[0004] The purpose of this application is to overcome or at least mitigate the shortcomings of the prior art and to provide a rotor stack and rotor with a simple structure that does not require potting resin to fix the magnets.

[0005] According to a first aspect of this application, a rotor stack is provided, including a plurality of first rotor laminations and a plurality of second rotor laminations stacked along the axial direction, at least one first rotor lamination being sandwiched between two second rotor laminations, the first rotor laminations forming a plurality of first magnet slots for accommodating magnets, and the second rotor laminations forming a plurality of second magnet slots for accommodating magnets, the first magnet slots and the second magnet slots being axially offset and communicating with each other.

[0006] Along a direction perpendicular to the thickness of the magnet, the first magnet groove includes a first sidewall and a second sidewall that are parallel to each other, and the second magnet groove includes a fifth sidewall and a sixth sidewall that are parallel to each other; the first sidewall abuts against the first side surface of the magnet, the sixth sidewall abuts against the second side surface of the magnet, and the distance between the first sidewall and the sixth sidewall along the direction parallel to the thickness of the magnet is equal to the thickness of the magnet; a gap is formed between the second sidewall and the second side surface, and a gap is formed between the fifth sidewall and the first side surface, and the first side surface and the second side surface are parallel to each other.

[0007] In at least one embodiment, the first magnet slot further includes opposing third and fourth sidewalls, and the second magnet slot further includes opposing seventh and eighth sidewalls; the third sidewall is close to the outer peripheral wall of the first rotor lamination, the seventh sidewall is close to the outer peripheral wall of the second rotor lamination, and the distance between the seventh sidewall and the outer peripheral wall of the second rotor lamination is less than the distance between the third sidewall and the outer peripheral wall of the first rotor lamination.

[0008] In at least one embodiment, the two first magnet slots are arranged symmetrically in a V-shape along the circumference, the two second magnet slots are arranged symmetrically in a V-shape along the circumference, and the distance between the two eighth sidewalls of the two adjacent second magnet slots is less than the distance between the two fourth sidewalls of the two adjacent first magnet slots.

[0009] In at least one embodiment, a first rotor lamination has a first shaft hole for receiving a rotating shaft, and a second rotor lamination has a second shaft hole for receiving a rotating shaft, the first shaft hole and the second shaft hole being axially connected; the inner diameter of the first shaft hole is not greater than the diameter of the rotating shaft, and the inner diameter of the second shaft hole is smaller than the diameter of the rotating shaft.

[0010] In at least one embodiment, the first rotor lamination and the second rotor lamination are stacked alternately along the axial direction.

[0011] In at least one embodiment, all the first rotor laminations are stacked axially to form a central stack, and at least one second rotor lamination is provided at each of the two axial ends of the central stack.

[0012] In at least one embodiment, a protrusion is formed on one axial side of the first rotor lamination and the second rotor lamination, and a recess is formed on one axial side of the other lamination to mate with the protrusion; and / or,

[0013] The thickness of the second rotor lamination is less than the thickness of the first rotor lamination.

[0014] In at least one embodiment, along the width direction parallel to the magnet, oil passage holes are also formed at both ends of the first magnet groove and the second magnet groove; the second sidewall and the sixth sidewall are each formed with two limiting protrusions, the magnet is located between the two limiting protrusions, and the oil passage hole is located at the end of the limiting protrusion away from the limiting protrusion.

[0015] In at least one embodiment, the areas of the first magnet groove and the second magnet groove that are axially interconnected are equal.

[0016] According to a second aspect of this application, a rotor is provided, comprising: a rotor core and a plurality of magnets, wherein the rotor core includes at least one rotor stack provided in the first aspect.

[0017] In the rotor stack provided in the embodiments of this application, the first sidewall of the first magnet slot in the first rotor lamination abuts against one side of the magnet, and the sixth sidewall of the second magnet slot in the second rotor lamination abuts against the other side of the magnet, thereby fixing the magnet. This eliminates the need to fill the magnet slot with resin, reducing the production cost of the rotor and improving the production efficiency of the rotor.

[0018] In the rotor stack provided in this embodiment, the contact area between the side of the magnet and the sidewall of the magnet slot is increased. Moreover, both sides of the magnet are supported by the sidewall of the magnet slot, which can avoid the problem of damage to the magnet due to stress concentration, ensure the yield of the rotor, and ensure the reliability of the rotor operation.

[0019] In the rotor stack provided in the embodiments of this application, the gap formed by the sidewall of the magnet slot and the side of the magnet constitutes part of the rotor cooling channel, so that the magnet can be directly cooled by the cooling medium, which can avoid the problem of demagnetization of the magnet due to high temperature. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a rotor provided according to the first embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the rotor after being stacked with magnets according to the first embodiment of this application.

[0022] Figure 3 yes Figure 2 The diagram shows a magnified view of a portion of the rotor stack from a first-view perspective.

[0023] Figure 4 yes Figure 2 A magnified schematic diagram of a portion of the rotor stack from a second perspective.

[0024] Figure 5 yes Figure 2 A cross-sectional view of a magnet and a rotor stacked magnet slot along the thickness direction of the magnet.

[0025] Figure 6 yes Figure 5 A schematic diagram after the magnet has been removed.

[0026] Figure 7 yes Figure 2 A schematic diagram of a first rotor lamination in the rotor stack shown.

[0027] Figure 8 yes Figure 7 A magnified view of a portion of the image.

[0028] Figure 9 yes Figure 2 A partially enlarged schematic diagram of a second rotor lamination in the rotor stack shown.

[0029] Figure 10 This is a partially enlarged schematic diagram of the rotor stack provided according to the second embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] R1 - Rotor;

[0032] R11 - Rotor stack;

[0033] 10-First rotor lamination; 11-First magnet slot; W1-First sidewall; W2-Second sidewall; W3-Third sidewall; W4-Fourth sidewall; 111-Oil passage hole; 112-Limiting protrusion; C1-First flow channel; 12-First shaft hole;

[0034] 20 - Second rotor lamination; 21 - Second magnet slot; W5 - Fifth sidewall; W6 - Sixth sidewall; W7 - Seventh sidewall; W8 - Eighth sidewall; C2 - Second flow channel;

[0035] R12 - End plate; R13 - Rotary shaft;

[0036] R14 magnet; S1 - First side surface; S2 - Second side surface;

[0037] Dr1 - First direction; Dr2 - Second direction. Detailed Implementation

[0038] Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement the present invention, and are not intended to exhaustively describe all possible ways of the invention, nor to limit the scope of the invention.

[0039] Unless otherwise specified, the terms radial, axial, and circumferential as used below refer to the radial, axial, and circumferential directions of the rotor.

[0040] First Implementation Method

[0041] Reference Figures 1 to 9 First, the rotor stack and rotor according to the first embodiment of this application will be introduced.

[0042] like Figure 1 As shown, the rotor R1 includes multiple rotor stacks R11, two end plates R12, and a rotating shaft R13. Each rotor stack R11 has multiple magnets R14 embedded in it. The multiple rotor stacks R11 are stacked axially to form a main stack. An end plate R12 is provided at each of the two ends of the main stack axially. The rotating shaft R13 passes through the rotor stacks R11 and the end plates R12 axially.

[0043] In this embodiment, at least one rotor stack R11 is formed by stacking two types of laminations. Specifically, the two types of laminations are a first rotor lamination 10 and a second rotor lamination 20. Multiple first rotor laminations 10 and multiple second rotor laminations 20 are stacked axially to form the rotor stack R11.

[0044] Along the axial direction, the first rotor lamination 10 and the second rotor lamination 20 are alternately stacked, such that at least one first rotor lamination 10 is sandwiched between two second rotor laminations 20. In this embodiment, the first rotor lamination 10 and the second rotor lamination 20 are alternately stacked one after the other along the axial direction.

[0045] The first rotor lamination 10 and the second rotor lamination 20 are respectively formed with a first magnet slot 11 and a second magnet slot 21 for accommodating the magnet R14, and the first magnet slot 11 and the second magnet slot 21 are interconnected along the axial direction.

[0046] In this embodiment, the first rotor lamination 10 includes multiple (such as...) Figure 2 As shown, this embodiment uses eight magnet slot groups, each comprising two magnet slot subgroups arranged radially in inner and outer layers. Each magnet slot group includes two first magnet slots 11 arranged in a V-shape along the circumference and symmetrically arranged radially; that is, one magnet slot group includes four first magnet slots 11. The arrangement of the second magnet slots 21 in the second rotor lamination 20 is similar and will not be described again here. The following will describe each individual first magnet slot 11 and each individual second magnet slot 21 in detail.

[0047] Combination Figures 3-6 It can be seen that the first magnetic groove 11 and the second magnetic groove 21 are offset along the axial direction.

[0048] like Figure 8 and Figure 9 As shown, each magnet slot includes two sidewalls along a first direction Dr1 and two sidewalls along a second direction Dr2, with the first direction Dr1 and the second direction Dr2 being perpendicular to each other. For ease of description of the first direction Dr1 and the second direction Dr2, a magnet R14 placed within the magnet slot is introduced as a reference frame. The first direction Dr1 is parallel to the thickness of the magnet R14; the second direction Dr2 is perpendicular to the thickness of the magnet R14, that is, the second direction Dr2 is parallel to the width of the magnet R14.

[0049] Specifically, the first magnetic groove 11 includes a first sidewall W1, a second sidewall W2, a third sidewall W3, and a fourth sidewall W4, wherein the first sidewall W1 and the second sidewall W2 are parallel to each other. The second magnetic groove 21 includes a fifth sidewall W5, a sixth sidewall W6, a seventh sidewall W7, and an eighth sidewall W8, wherein the fifth sidewall W5 and the sixth sidewall W6 are parallel to each other. Figure 5 and Figure 6It can be seen that, due to the axial misalignment of the first magnet slot 11 and the second magnet slot 21, the first sidewall W1 of all the first rotor laminations 10 abuts against the first sidewall S1 of the magnet R14, and the second sidewall W2 of all the first rotor laminations 10 forms a gap with the second sidewall S2 of the magnet R14, which constitutes the first flow channel C1. The sixth sidewall W6 of all the second rotor laminations 20 abuts against the second sidewall S2 of the magnet R14, and the fifth sidewall W5 of all the second rotor laminations 20 forms a gap with the first sidewall S1 of the magnet R14, which constitutes the second flow channel C2.

[0050] like Figure 5 As shown, along the second direction Dr2, the distance between the first sidewall W1 and the sixth sidewall W6 is equal to the distance between the first sidewall S1 and the second sidewall S2 of the magnet R14, that is, the distance between the first sidewall W1 and the sixth sidewall W6 is equal to the thickness of the magnet R14. After the magnet R14 is placed in the magnet slot, the first sidewall W1 and the sixth sidewall W6 can make interference contact with the sidewalls of the magnet R14, so that the magnet R14 can be directly clamped and fixed by the first sidewall W1 and the sixth sidewall W6. Moreover, combined with Figure 5 and Figure 6 It can be seen that after the magnet R14 is placed in the magnet slot, neither the first sidewall W1 nor the sixth sidewall W6 will undergo significant deformation. Therefore, the first sidewall W1 and the sixth sidewall W6 will not exert elastic force on the magnet R14 due to deformation, which can reduce the pressure on the magnet R14. It can also avoid the problem of fatigue caused by deformation of the first sidewall W1 and the sixth sidewall W6.

[0051] In this embodiment, by setting the first magnet slot 11 and the second magnet slot 21 to be axially offset, the first sidewalls W1 of all the first rotor laminations 10 and the sixth sidewalls W6 of all the second rotor laminations 20 complete the clamping and fixing of the magnet R14, thus eliminating the need for resin potting, which can greatly reduce the production cost of the rotor and improve the production efficiency of the rotor. Moreover, it can increase the contact area between the first sidewall S1 and the second sidewall S2 of the magnet R14 and the magnet slot, reduce the pressure on the magnet R14, avoid the problem of local stress concentration in the magnet R14, thereby avoiding cracks or even damage to R14, ensuring the yield of the rotor, and ensuring the stability and reliability of the rotor operation.

[0052] In this embodiment, along the first direction Dr1, oil passage holes 111 are formed at both ends of the first magnet groove 11 and the second magnet groove 21. The oil passage holes 111 are connected to the first flow channel C1 and the second flow channel C2, so that the refrigerant can directly contact the first side S1 and the second side S2 of the magnet R14, which can improve the cooling efficiency of the magnet R14 and avoid the problem of demagnetization of the magnet R14 due to high temperature, thereby improving the rotor working performance.

[0053] In this embodiment, to ensure the size of the oil passage 111, two spaced-apart limiting protrusions 112 are formed on the second sidewall W2 of the first magnet groove 11 along the first direction Dr1. The distance between the two limiting protrusions 112 is equal to the width of the magnet R14 (i.e., the size of the magnet R14 along the first direction Dr1). The limiting protrusions 112 protrude from the sixth sidewall W6 of the second magnet groove 21 along the second direction Dr2, so that the magnet R14 is fixed by the two limiting protrusions 112, preventing the two magnets R14 from moving along the first direction Dr1. Similarly, two limiting protrusions 112 are also formed on the sixth sidewall W6 of the second magnet groove 21.

[0054] It should be noted that, Figure 8 and Figure 9 To help readers understand the oil passage 111 more intuitively, a boundary of the oil passage 111 is indicated by a dashed line in the magnetic steel groove. However, this dashed line does not exist in the actual product.

[0055] In this embodiment, the dimensions of the first flow channel C1 and the second flow channel C2 are the same along the second direction Dr2, so as to ensure that the cooling effect of the first side S1 and the second side S2 of the magnet R14 is similar, and to avoid the problem of local overheating of the magnet R14.

[0056] Moreover, the first flow channel C1 and the second flow channel C2 are arranged alternately along the axial direction, which can further ensure the cooling effect of the magnet R14.

[0057] Optionally, along the second direction Dr2, the dimensions of the first flow channel C1 and the second flow channel C2 are both not less than 0.05 mm and not greater than 0.15 mm. This ensures the flow of refrigerant within the flow channels while reducing the gap between the second sidewall W2, the fifth sidewall W5 and the surface of the magnet R14, thereby reducing the magnetic resistance of the magnetic circuit and ensuring the performance of the rotor.

[0058] In this embodiment, the first magnet slot 11 and the second magnet slot 21 are identical in size and shape, meaning their areas are equal. This allows the first rotor lamination 10 and the second rotor lamination 20 to be formed using the same stamping die. It is only necessary to ensure that the arrangement of the first magnet slots 11 in the first rotor lamination 10 and the second magnet slots 21 in the second rotor lamination 20 differs. For example, after stamping the first rotor lamination 10, the stamping die can be rotated by a certain angle to continue stamping the silicon steel sheet to form the second rotor lamination 20. This reduces the manufacturing cost of the rotor and improves manufacturing efficiency.

[0059] like Figure 8As shown, in the first rotor lamination 10, the distance between the third sidewall W3 of the first magnet slot 11 and the outer peripheral wall of the first rotor lamination 10 is d1. Figure 9 As shown, in the second rotor lamination 20, the distance between the seventh side wall W7 of the second magnet slot 21 and the outer peripheral wall of the second rotor lamination 20 is d2.

[0060] In this embodiment, combined with Figure 5 , Figure 8 As shown in Figures 9 and 9, along the second direction Dr2, the first sidewall W1 is in contact with the outer diameter surface (i.e., the first side surface S1) of the magnet R14. Therefore, during rotor rotation, the first sidewall W1 will be subjected to the centrifugal force of the magnet R14, while the fifth sidewall W5 is not in contact with the outer diameter surface (i.e., the first side surface S1) of the magnet R14. That is, during rotor rotation, the first rotor lamination 10 will be affected by the centrifugal force of the magnet R14, while the second rotor lamination 20 will not be affected by the centrifugal force of the magnet R14.

[0061] Therefore, in this embodiment, the distance d2 is set to be less than the distance d1. This setting can ensure the structural strength of the first rotor lamination 10 and prevent the first rotor lamination 10 from being damaged by the centrifugal force of the magnet R14. At the same time, since the second rotor lamination 20 does not need to bear the centrifugal force of the magnet R14, by reducing the distance d2 between the seventh side wall W7 and the outer peripheral wall of the second rotor lamination 20, that is, reducing the thickness of the magnetic bridge in the second rotor lamination 20, leakage flux can be reduced, which helps to improve the performance of the motor applied to this rotor.

[0062] Optionally, the distance d2 is less than the distance d1 in the range of 0.2-0.3 mm. Unless otherwise specified, the numerical ranges in this embodiment include the extreme values.

[0063] In this embodiment, since the second rotor lamination 20 does not need to bear the centrifugal force of the magnet R14, the thickness of the second rotor lamination 20 is set to be less than the thickness of the first rotor lamination 10, thereby reducing the eddy current loss of the rotor, which helps to reduce the iron loss of the motor and improve the performance of the motor.

[0064] Optionally, the thickness of the first rotor lamination 10 is not less than 0.2 mm and not more than 0.3 mm. The thickness of the second rotor lamination 20 is not less than 0.05 mm and not more than 0.15 mm.

[0065] like Figure 8 As shown, the distance between the fourth sidewalls W4 of two adjacent first magnet slots 11 in the same magnet slot subgroup of the first rotor lamination 10 is D1. Figure 9As shown, the distance between the eighth sidewalls W8 of two adjacent second magnet slots 21 in the same magnet slot group of the second rotor lamination 20 is D2. In this embodiment, the distance D2 is less than the distance D1, thereby further reducing magnetic leakage and further improving the performance of the motor.

[0066] The first rotor lamination 10 has a first shaft hole 12, and the corresponding second rotor lamination 20 has a second shaft hole (not shown in the figure). The first shaft hole 12 and the second shaft hole are axially connected to accommodate the rotating shaft R13. In this embodiment, the inner diameter of the first shaft hole 12 is not greater than the diameter of the rotating shaft R13, and the inner diameter of the second shaft hole is smaller than the diameter of the rotating shaft R13. That is, the second rotor lamination 20 is interference-fitted with the rotating shaft R13, while the first rotor lamination 10 is not interference-fitted with the rotating shaft R13. The advantage of this arrangement is that the first rotor lamination 10 will not deform due to the force applied by the rotating shaft R13 when the rotor rotates, which can ensure effective contact between the first sidewall W1 of the first magnet groove 11 and the first side surface S1 of the magnet R1, while preventing the second sidewall W2 of the first magnet groove 11 from contacting the second side surface S2 of the magnet R14, thus ensuring the unobstructed flow of the first flow channel C1.

[0067] By setting the second rotor lamination 20 to be interference-fitted with the shaft R13, the sixth side wall W6 of the second magnet slot 21 in the second rotor lamination 20 can be effectively contacted with the second side surface S2 of the magnet R1, ensuring its clamping effect on the magnet R14. Simultaneously, during the rotation of the shaft R13, the torque of the shaft R13 is transmitted through the second rotor lamination 20 to the first rotor lamination 10 in contact with it, ensuring the rotation of the rotor stack.

[0068] In this embodiment, in order to ensure that the torque of the rotating shaft R13 can be transmitted to the first rotor lamination 10 through the second rotor lamination 20, such as Figure 7 As shown, a connecting structure 13 is formed on the first rotor lamination 10, and correspondingly, a connecting structure 13 is also formed on the second rotor lamination 20. Specifically, the connecting structure 13 is a mortise formed by stamping, that is, the connecting structure 13 is a protrusion on one side of the axial direction and a concave part on the other side of the axial direction, thereby realizing the fixed connection between the first rotor lamination 10 and the second rotor lamination 20.

[0069] In this embodiment, since the first rotor lamination 10 and the second rotor lamination 20 are stacked alternately along the axial direction, the torque of the shaft R13 can be transmitted to the first rotor lamination 10 through the second rotor lamination 20, thus ensuring the stability of the rotor operation.

[0070] Second Implementation Method

[0071] Reference Figure 10This paper describes a rotor stack and rotor according to a second embodiment of the present application. The second embodiment is a variation of the first embodiment. Components with the same or similar structure or function as those in the first embodiment are marked with the same reference numerals, and specific descriptions of these components are omitted.

[0072] The main difference between this embodiment and the first embodiment is that the second rotor lamination 20 in the rotor stack R11 is only located at the end of the rotor stack R11. That is, all the first rotor laminations 10 are stacked axially to form a middle stack, and at least one second rotor lamination 20 is provided at each of the two axial ends of the middle stack.

[0073] In this embodiment, all the first sidewalls W1 of the middle stack form a support surface along the axial direction that integrally contacts the first side surface S1 of the magnet R14. This can improve the strength of the rotor stack R11 against the centrifugal force of the magnet R14, thereby improving the structural strength of the rotor stack R11. Moreover, it can reduce the probability of the magnet R14 breaking under high-speed conditions, making the rotor suitable for high-speed conditions.

[0074] It should be understood that the above-described embodiments and some aspects or features thereof can be appropriately combined.

[0075] This application has at least one of the following advantages:

[0076] (i) The rotor stack provided in this application includes two types of rotor laminations. In the first rotor lamination, the first sidewall of the first magnet slot abuts against one side of the magnet, and in the second rotor lamination, the sixth sidewall of the second magnet slot abuts against the other side of the magnet. This achieves the fixation of the magnet without the need to fill the magnet slot with resin, thereby reducing the production cost of the rotor and improving the production efficiency of the rotor.

[0077] (ii) The rotor stack provided in this application can increase the contact area between the side of the magnet and the magnet slot, reduce the pressure on the magnet, avoid the problem of stress concentration in the local area of ​​the magnet, thereby avoiding cracks or even damage, ensuring the yield of the rotor, and ensuring the stability and reliability of the rotor operation.

[0078] (iii) In the rotor stack provided in this application, the gap formed by the side wall of the magnet slot and the side of the magnet constitutes the flow channel of the rotor cooling channel, so that the magnet can be directly cooled by the cooling medium, which can avoid the problem of demagnetization of the magnet due to high temperature.

[0079] (iv) In the rotor stack provided by this application, the size of the magnetic bridge in the second rotor lamination is reduced, which can reduce magnetic leakage and help improve motor performance.

[0080] Of course, this application is not limited to the above-described embodiments. Those skilled in the art can make various modifications to the above-described embodiments of this application under the guidance of this application, without departing from the scope of this application.

Claims

1. A rotor lamination, characterized by, It includes a plurality of first rotor laminations and a plurality of second rotor laminations stacked along the axial direction, with at least one first rotor lamination sandwiched between two second rotor laminations. The first rotor laminations have a plurality of first magnet slots for accommodating magnets, and the second rotor laminations have a plurality of second magnet slots for accommodating magnets. The first magnet slots and the second magnet slots are axially offset and interconnected. Along a direction perpendicular to the thickness of the magnet, the first magnet groove includes a first sidewall and a second sidewall that are parallel to each other, and the second magnet groove includes a fifth sidewall and a sixth sidewall that are parallel to each other; the first sidewall abuts against a first side surface of the magnet, the sixth sidewall abuts against a second side surface of the magnet, and the distance between the first sidewall and the sixth sidewall along a direction parallel to the thickness of the magnet is equal to the thickness of the magnet; a gap is formed between the second sidewall and the second side surface, and a gap is formed between the fifth sidewall and the first side surface, and the first side surface and the second side surface are parallel to each other.

2. The rotor stack of claim 1, wherein The first magnet slot further includes opposing third and fourth sidewalls, and the second magnet slot further includes opposing seventh and eighth sidewalls; the third sidewall is close to the outer peripheral wall of the first rotor lamination, the seventh sidewall is close to the outer peripheral wall of the second rotor lamination, and the distance between the seventh sidewall and the outer peripheral wall of the second rotor lamination is less than the distance between the third sidewall and the outer peripheral wall of the first rotor lamination.

3. The rotor stack of claim 2, wherein The two first magnet slots are arranged symmetrically in a V-shape along the circumference, and the two second magnet slots are arranged symmetrically in a V-shape along the circumference. The distance between the two eighth sidewalls of the two adjacent second magnet slots is less than the distance between the two fourth sidewalls of the two adjacent first magnet slots.

4. The rotor stack of claim 1, wherein The first rotor lamination has a first shaft hole for accommodating the rotating shaft, and the second rotor lamination has a second shaft hole for accommodating the rotating shaft. The first shaft hole and the second shaft hole are axially connected. The inner diameter of the first shaft hole is not greater than the diameter of the rotating shaft, and the inner diameter of the second shaft hole is smaller than the diameter of the rotating shaft.

5. A rotor stack according to claim 1 or 4, characterised in that The first rotor lamination and the second rotor lamination are stacked alternately along the axial direction.

6. The rotor stack of claim 1 or 4, characterized in that All the first rotor laminations are stacked axially to form a central stack, and at least one second rotor lamination is provided at each of the two ends of the central stack.

7. The rotor stack of claim 4, wherein One of the first rotor laminations and the second rotor lamination has a protrusion on one axial side, and the other lamination has a recess on one axial side that mates with the protrusion; and / or, The thickness of the second rotor lamination is less than the thickness of the first rotor lamination.

8. The rotor stack of claim 1, wherein Along the width direction parallel to the magnet, oil passage holes are also formed at both ends of the first magnet groove and the second magnet groove; the second sidewall and the sixth sidewall each have two limiting protrusions, the magnet is located between the two limiting protrusions, and the oil passage hole is located at the end of the limiting protrusion away from the limiting protrusion.

9. The rotor stack of claim 1, wherein The areas of the first magnetic groove and the second magnetic groove, which are axially interconnected, are equal.

10. A rotor comprising: A rotor core and a plurality of magnets, characterized in that the rotor core comprises at least one rotor stack according to any one of claims 1-9.

Images