Rotor punching sheet and permanent magnet motor

Abstract

The utility model provides a rotor punching sheet and a permanent magnet motor, and the rotor punching sheet is provided with a shaft hole which is arranged at the center of the rotor punching sheet and penetrates through the rotor punching sheet; the plurality of magnet grooves penetrate through the rotor punching sheet, and the plurality of magnet grooves are sequentially arranged at intervals along the circumferential direction of the rotor punching sheet; any magnet groove comprises a first groove section and a second groove section, and the extending directions of the first groove section and the second groove section are different. Any one magnetic isolation hole is formed between the shaft hole and one magnet groove, the preset axis penetrates through the magnetic isolation hole, the preset axis is located between the first groove section and the second groove section of the magnet groove, and the preset axis penetrates through the center of the shaft hole; the maximum length of the magnetic isolation holes along the radial direction of the rotor punching sheet is greater than the maximum length of the magnetic isolation holes along the tangential direction of the rotor punching sheet. The rotor punching sheet provided by the utility model solves the technical problem that the efficiency of a permanent magnet motor in the prior art is difficult to further improve.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor field, specifically, rotor punching sheet and permanent magnet motor are related. BACKGROUND

[0002] Permanent magnet motor has simple structure, low cost, high reliability, small size, light weight and so on, at present, has the extensive application in modern industrial production and daily life. Further improve permanent magnet motor efficiency, thereby reduce energy consumption, reduce heating, is the important direction of the effort of the designer in the field.

[0003] Permanent magnet motor in the prior art, on the basis of existing structure, through the optimization design to each parameter, its efficiency promotion meets the bottleneck, is difficult to further improve, in view of this technical problem, currently, no effective solution has been proposed. INVENTION CONTENTS

[0004] The main purpose of the utility model is to provide a kind of rotor punching sheet and permanent magnet motor, to solve the technical problems that permanent magnet motor efficiency in relevant technology is difficult to further improve.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a rotor punching sheet is provided, the rotor punching sheet is provided with: shaft hole, the shaft hole is arranged at the center of the rotor punching sheet, and the shaft hole penetrates the rotor punching sheet; A plurality of magnet grooves, each magnet groove penetrates the rotor punching sheet, and the plurality of magnet grooves are sequentially and spaced apart along the circumference of the rotor punching sheet;For any one magnet groove, it includes first slot section and second slot section, the extension direction of the first slot section and the second slot section is different;One or more magnetic separation holes, wherein, for any one magnetic separation hole, it is arranged between the shaft hole and one magnet groove, and the preset axis passes through the magnetic separation hole, the preset axis is located between the first slot section and the second slot section of the magnet groove, the preset axis passes through the center of the shaft hole, and the maximum length of the magnetic separation hole along the radial direction of the rotor punching sheet is greater than the maximum length of the magnetic separation hole along the tangential direction of the rotor punching sheet.

[0006] Further, the magnetic separation hole is a plurality of, and the plurality of magnetic separation holes correspond to the plurality of magnet grooves one by one.

[0007] Further, for any one magnetic separation hole, it is symmetrically arranged relative to the preset axis;For the magnet groove corresponding to the magnetic separation hole, the first slot section and the second slot section are symmetrically arranged relative to the preset axis.

[0008] Further, for any one magnetic separation hole, it satisfies 0.3≤S1 / (L2*L3)≤1, wherein S1 is the area of the magnetic separation hole, L2 is the maximum length of the magnetic separation hole along the radial direction of the rotor punching sheet, and L3 is the maximum length of the magnetic separation hole along the tangential direction of the rotor punching sheet.

[0009] Further, for any one magnetic isolation hole, the distance L5 between the magnetic isolation hole and the corresponding magnetic slot satisfies 0.4mm≤L5≤1.5mm.

[0010] Further, the rotor lamination structure satisfies 3.5mm≤L1-R1≤9mm, wherein L1 is the minimum distance between any one magnetic isolation hole and the center of the shaft hole, and R1 is the radius of the shaft hole.

[0011] Further, along the tangential direction of the rotor lamination, the maximum length of the magnetic slot is L4, and along the tangential direction of the rotor lamination, the maximum length of the magnetic isolation hole is L3, wherein 0.1≤L3 / L4≤0.5.

[0012] Further, the magnetic isolation hole is rectangular, trapezoidal, arc-shaped or irregularly shaped.

[0013] Further, for any one magnetic slot, the first slot section and the second slot section are in communication, and the connection between the first slot section and the second slot section is protrusively arranged towards the shaft hole.

[0014] Further, for any one magnetic isolation hole, the area S1 satisfies 10mm 2 ≤S1≤40mm 2 , and the radius R1 of the shaft hole satisfies 6mm≤R1≤9mm.

[0015] The utility model provides according to another aspect of the utility model, provide a kind of permanent magnet motor, the rotor core of permanent magnet motor includes the multiple rotor laminations of sequentially stacked settings, wherein, rotor lamination is the rotor lamination described above.

[0016] The rotor lamination of the embodiment of the utility model is provided with: an axle hole, the axle hole is arranged at the center of the rotor lamination, and the axle hole penetrates the rotor lamination; a plurality of magnet grooves, each magnet groove penetrates the rotor lamination, and the plurality of magnet grooves are sequentially and spacedly arranged along the circumference of the rotor lamination; for any one magnet groove, it comprises a first groove section and a second groove section, the extension directions of the first groove section and the second groove section are different; one or more magnetic separation holes, for any one magnetic separation hole, it is arranged between the axle hole and one magnet groove, a preset axis passes through the magnetic separation hole, the preset axis is located between the first groove section and the second groove section of the magnet groove, the preset axis passes through the center of the axle hole, and the maximum length of the magnetic separation hole along the radial direction of the rotor lamination is greater than the maximum length of the magnetic separation hole along the tangential direction of the rotor lamination. The rotor lamination with the structural design is used, the magnetic separation hole is designed between the magnet groove and the axle hole, the length of the magnetic separation hole along the radial direction of the rotor lamination is greater than the length along the tangential direction, the magnetic flux between the magnetic separation hole and the magnet groove is saturated, the magnetic force line is not easy to pass through from the position, the magnetic field between the first groove section and the second groove section of the same magnet groove is better separated, the magnetic flux leakage between the two magnets in the same magnet groove is reduced, the magnetic force line circumferential diffusion between the adjacent magnetic poles is blocked, the magnetic force line distribution between the adjacent magnetic poles is more compact and uniform, the back electromotive force of the permanent magnet motor is improved, the motor loss is reduced, the motor efficiency is improved, and the technical problem that the efficiency of the permanent magnet motor in the related art is difficult to further improve is solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the preferred embodiments explain the application. In the drawings:

[0018] Figure 1 It is a structural schematic view of the first embodiment of the rotor lamination of the utility model;

[0019] Figure 2 It is a structural schematic view of the second embodiment of the rotor lamination of the utility model;

[0020] Figure 3 It is a structural schematic view of the third embodiment of the rotor lamination of the utility model;

[0021] Figure 4 It is a structural schematic view of the fourth embodiment of the rotor lamination of the utility model;

[0022] Figure 5 It is a structural schematic view of the fifth embodiment of the rotor lamination of the utility model;

[0023] Figure 6 It is a structural schematic view of the rotor lamination in the related art;

[0024] Figure 7 The magnetic flux density mean value diagram of the permanent magnet motor of the application and the permanent magnet motor in the related art.

[0025] The above-mentioned drawings include the following reference signs:

[0026] 1, shaft hole; 2, magnet slot; 21, first slot section; 22, second slot section; 3, magnetic isolation hole; 4, heat dissipation hole. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] Please refer to Figures 1 to 7 In order to achieve the above-mentioned purpose, the embodiment of the present application provides a rotor punching sheet, which is provided with: a shaft hole 1, the shaft hole 1 is arranged at the center of the rotor punching sheet, and the shaft hole 1 penetrates the rotor punching sheet; a plurality of magnet slots 2, each magnet slot 2 penetrates the rotor punching sheet, and the plurality of magnet slots 2 are sequentially and spacedly arranged along the circumference of the rotor punching sheet; for any one magnet slot 2, it includes a first slot section 21 and a second slot section 22, the extension directions of the first slot section 21 and the second slot section 22 are different; one or more magnetic isolation holes 3, for any one magnetic isolation hole 3, it is arranged between the shaft hole 1 and one magnet slot 2, a preset axis passes through the magnetic isolation hole 3, the preset axis is located between the first slot section 21 and the second slot section 22 of the magnet slot 2 corresponding to the magnetic isolation hole 3, the preset axis passes through the center of the shaft hole 1, and the maximum length of the magnetic isolation hole 3 along the radial direction of the rotor punching sheet is greater than the maximum length of the magnetic isolation hole 3 along the tangential direction of the rotor punching sheet.

[0029] The rotor punching sheet with the above-mentioned structure design is designed with the magnetic isolation hole 3 between the magnet slot 2 and the shaft hole 1, and the length of the magnetic isolation hole 3 along the radial direction of the rotor punching sheet is greater than the length along the tangential direction, the magnetic flux between the magnetic isolation hole 3 and the magnet slot 2 is saturated, the magnetic force line is not easy to pass through this position, thereby better separating the magnetic field between the first slot section 21 and the second slot section 22 of the same magnet slot 2, reducing the magnetic leakage between the two magnets in the same magnet slot 2, blocking the circumferential diffusion of the magnetic force line between the adjacent magnetic poles, thereby making the magnetic force line distribution between the adjacent magnetic poles more compact and uniform, which is beneficial to improve the back electromotive force of the permanent magnet motor, thereby reducing the motor loss and improving the motor efficiency, and solving the technical problem that the efficiency of the permanent magnet motor in the related art is difficult to further improve.

[0030] In addition, the design of the magnetic isolation hole 3 is also beneficial to strengthen the heat dissipation of the rotor punching sheet and the magnetic steel installed therein, thereby inhibiting the decrease of the coercive force caused by the temperature rise, improving the demagnetization resistance of the magnetic steel, and ensuring the motor performance.

[0031] Figure 6 For the structure diagram of the rotor lamination in the related art, it can be seen that although the rotor lamination in the related art has the heat dissipation hole 4, it is not the same structure as the magnetic isolation hole 3 in the embodiment of the utility model, the tangential length of the heat dissipation hole 4 along the rotor lamination is greater than the radial length along the rotor lamination, it cannot separate the magnetic field between the first slot section 21 and the second slot section 22 of the same magnet slot 2, cannot reduce the magnetic leakage between the two magnets in the same magnet slot 2, and cannot block the circumferential diffusion of the magnetic force lines between the adjacent magnetic poles, so that the magnetic leakage is more serious. The magnetic isolation hole 3 of the rotor lamination in the embodiment of the utility model is designed to have a radial length along the rotor lamination greater than a tangential length, which can effectively separate the magnetic field between the first slot section 21 and the second slot section 22 of the same magnet slot 2, reduce the magnetic leakage between the two magnets in the same magnet slot 2, and block the circumferential diffusion of the magnetic force lines between the adjacent magnetic poles, so that the magnetic force line distribution between the adjacent magnetic poles is more compact and uniform, which is beneficial to improve the back electromotive force of the permanent magnet motor, thereby reducing the motor loss and improving the motor efficiency.

[0032] It should be noted that the first slot section 21 and the second slot section 22 are both classified as the same magnet slot 2, and in specific implementation, for one magnet slot 2, the first slot section 21 and the second slot section 22 contained therein can be integrated, that is, they are in communication with each other, or they can be separated, that is, the first slot section 21 and the second slot section 22 are arranged at a certain distance. In the motor production process, a magnetic steel is respectively inserted into the first slot section 21 and the second slot section 22.

[0033] The extension directions of the first slot section 21 and the second slot section 22 are different, that is, the extension directions of the first slot section 21 and the second slot section 22 are different, as long as the extension directions of the two are not completely consistent, it can be understood as the above-mentioned difference, and the two can have an area with consistent extension directions.

[0034] In actual implementation, when the magnetic isolation hole 3 is multiple, in order to better ensure the uniformity of the magnetic density distribution, the multiple magnetic isolation holes 3 are uniformly and spaced apart along the circumference of the rotor lamination. Specifically, the number of magnetic isolation holes 3 can be the same as the number of magnet slots 2, for example Figures 1 to 4 Embodiment. The number of magnetic isolation holes 3 can also be different from the number of magnet slots 2, for example Figure 5 Embodiment.

[0035] As a preferred embodiment, the plurality of magnetic isolation holes 3 correspond to the plurality of magnet grooves 2 one by one. By designing the plurality of magnetic isolation holes 3, and the plurality of magnetic isolation holes 3 correspond to the plurality of magnet grooves 2 one by one, that is, the number of the two is equal at this time, so that the magnetic field between the two magnetic steels in each magnet groove 2 can be isolated by the plurality of magnetic isolation holes 3 respectively, and the circumferential diffusion of the magnetic force line between each adjacent magnetic pole is blocked, so that the magnetic force line distribution between the adjacent magnetic poles is more compact and uniform, and the magnetic force line can pass through the rotor more fully, thereby reducing the magnetic flux leakage, and the efficiency of the permanent magnet motor is improved to a greater extent. Moreover, since the plurality of magnetic isolation holes 3 correspond to the plurality of magnet grooves 2 one by one, it is also beneficial to make the magnetic force line distribution more uniform, thereby optimizing the motor performance, and in addition, the dynamic balance of the rotor can be better controlled.

[0036] For any one magnetic isolation hole 3, it is symmetrically arranged relative to the preset axis; for the magnet groove 2 corresponding to the magnetic isolation hole 3, the first groove segment 21 and the second groove segment 22 are symmetrically arranged relative to the preset axis.

[0037] In the embodiment, the first groove segment 21 and the second groove segment 22 of the same magnet groove 2 are symmetric relative to the preset axis, and the magnetic isolation hole 3 corresponding thereto is also symmetric relative to the preset axis, so that the magnetic field distribution on both sides of the magnetic isolation hole 3 is more uniform, and the magnetic flux density effect of the permanent magnet motor is improved. Of course, in other optional embodiments, the positional relationship between these structures can also be arranged in a staggered manner.

[0038] Here, the magnetic isolation hole 3, the preset axis, and the magnet groove 2 are in a corresponding relationship, that is, the preset axis passes through the magnetic isolation hole 3 and is located between the first groove segment 21 and the second groove segment 22 of the magnet groove 2, the three correspond to each other, and the magnetic isolation hole 3 and the magnet groove 2 are symmetrically arranged relative to the preset axis.

[0039] In the embodiment, for any one magnetic isolation hole 3, it satisfies 0.3≤S1 / (L2*L3)≤1, wherein S1 is the area of the magnetic isolation hole 3, L2 is the maximum length of the magnetic isolation hole 3 along the radial direction of the rotor punching sheet, and L3 is the maximum length of the magnetic isolation hole 3 along the tangential direction of the rotor punching sheet. In the embodiment, the structure of the rotor punching sheet also satisfies 0.3≤S1 / (L2*L3)≤1. By controlling the area of each magnetic isolation hole 3 on the rotor punching sheet, the condition that the rotor punching sheet is insufficient in rigidity due to the magnetic isolation hole 3 being too large can be avoided, and the condition that the improvement effect on the magnetic flux density is not obvious due to the magnetic isolation hole 3 being too small can also be avoided. It has been proved by practice that the magnetic isolation hole 3 has obvious effect on the improvement of the magnetic flux density under the condition that S1 / (L2*L3) is in the range, and the efficiency of the permanent magnet motor can be effectively improved.

[0040] Preferably, for any one magnetic isolation hole 3, the distance L5 between the magnetic isolation hole 3 and the corresponding magnet groove 2 satisfies 0.4mm≤L5≤1.5mm.

[0041] By designing the distance L5 between the magnetic isolation hole 3 and the adjacent magnet slot 2, the magnetic isolation effect of the magnetic isolation hole 3 was optimized. Specifically, if L5 is designed to be too large, the magnetic flux in the area between the magnetic isolation hole 3 and the magnet slot 2 will be unsaturated, resulting in magnetic leakage. If L5 is designed to be too small, it will increase the processing difficulty and make the structural strength between the magnetic isolation hole 3 and the magnet slot 2 too low, thereby increasing the risk of breakage in this part. Practice has proven that within this range, L5 can effectively reduce the magnetic leakage between two magnets under the same magnetic pole and improve the efficiency of the permanent magnet motor while ensuring the reliability of the rotor lamination structure.

[0042] As a preferred embodiment, the rotor lamination structure satisfies 3.5mm≤L1-R1≤9mm, where L1 is the minimum distance between the center of any magnetic isolation hole 3 and the shaft hole 1, and R1 is the radius of the shaft hole 1.

[0043] In this embodiment, the value of L1-R1 is further controlled so that 3.5mm≤L1-R1≤9mm. This range is an indirect limitation on the radial length of the magnetic isolation hole 3. If the value is too large, it will not only cause waste but also increase the processing difficulty and make it difficult to meet the rigidity requirements. If the value is too small, the magnetic lines of force will pass through the lower end of the magnetic isolation hole 3 (i.e., between the magnetic isolation hole 3 and the shaft hole 1), thus making the improvement of magnetic density insignificant. Practice has proven that within this range, L1-R1 can, while ensuring the structural strength of the rotor lamination, enable the magnetic isolation hole 3 to better block the passage of magnetic lines of force between adjacent magnetic poles, thereby making the magnetic density distribution more uneven.

[0044] Along the tangent of the rotor lamination, the maximum length of the magnet slot 2 is L4, and along the tangent of the rotor lamination, the maximum length of the magnetic isolation hole 3 is L3, where 0.1 ≤ L3 / L4 ≤ 0.5. Figures 1 to 5 As shown, L3 is the maximum length of the magnetic isolation hole 3 along the tangential direction of the rotor lamination, and L4 is the maximum length of the magnet slot 2 along the tangential direction of the rotor lamination. Figures 1 to 5 In the embodiments described, L4 can also be interpreted as the maximum straight-line distance between the two ends of the magnet slot 2.

[0045] In this embodiment, the width of the magnetic isolation hole 3 on the rotor lamination was further optimized so that 0.1≤L3 / L4≤0.5. This range limits the maximum width of the magnetic isolation hole 3 in the circumferential direction (along the tangential direction of the rotor lamination). Specifically, if L3 / L4 is designed to be too small, the magnetic lines of force will easily expand outward in the circumferential direction, making the improvement effect on magnetic flux density insignificant; if L3 / L4 is designed to be too large, the length of the magnetic isolation hole 3 in the circumferential direction will be too long. In practice, it has been found that this will also affect the magnetic flux density distribution between adjacent magnetic poles and may cause interference between other hole structures.

[0046] like Figures 1 to 4As shown, the magnetic isolation hole 3 can be selected in various shapes in actual implementation, such as rectangular, trapezoidal, arc-shaped and other regular or irregular shapes, as long as the length of the magnetic isolation hole 3 along the radial direction of the rotor lamination between the magnet slot 2 and the shaft hole 1 is greater than the length along the tangential direction, the magnetic isolation effect can be achieved, thereby improving the magnetic flux density distribution of the permanent magnet motor and improving the efficiency of the permanent magnet motor.

[0047] Preferably, the width of the magnetic isolation hole 3 gradually decreases in the direction outward along the radial direction of the rotor lamination, that is, the size of the magnetic isolation hole 3 along the tangential direction of the rotor lamination, so as to better match the magnetic field distribution generated by the magnet in the magnet slot 2 and improve the magnetic flux density effect.

[0048] In the embodiment, for any one magnet slot 2, the first slot section 21 is in communication with the second slot section 22, and the connection between the first slot section 21 and the second slot section 22 is protrudingly arranged towards the shaft hole 1.

[0049] In the embodiment, the magnet slot 2 is a V-shaped slot, the first slot section 21 of the magnet slot 2 is in communication with the second slot section 22, and the slot structure at the connection is protrudingly arranged towards the shaft hole. In the related art, a recess is usually designed at the end of the magnet slot 2 (as shown in Figure 6 The application designs the connection between the two slot sections as a protruding structure, which reduces the distance between the magnet slot 2 and the magnetic isolation hole 3, and is beneficial to further reducing the magnetic flux leakage and improving the efficiency of the motor.

[0050] Specifically, for any one magnetic isolation hole 3, the area S1 satisfies 10mm 2 ≤S1≤40mm 2 , and the radius R1 of the shaft hole 1 satisfies 6mm≤R1≤9mm.

[0051] Finally, the embodiment of the utility model also provides a permanent magnet motor, the permanent magnet motor includes a rotor core, the rotor core includes a plurality of rotor laminations which are sequentially stacked, wherein the rotor lamination is the above-mentioned rotor lamination.

[0052] Figure 7 For the average magnetic flux density of the permanent magnet motor using the rotor lamination of the utility model and the permanent magnet motor in the related art, as shown in Figure 7 , wherein the original scheme is the permanent magnet motor in the related art, and the new scheme 1 to the new scheme 5 are the permanent magnet motor using the rotor lamination of the utility model, and the difference between different new schemes lies in that the number and position of the magnetic isolation hole 3 are different. It can be seen that the average magnetic flux density of the permanent magnet motor using the rotor lamination of the utility model is higher than that of the original scheme in the related art, which indicates that the magnetic flux leakage of the motor is smaller, so that the magnetic flux lines are more concentrated and uniform, and the efficiency of the motor is also higher than that of the scheme in the related art.

[0053] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0054] The rotor lamination of the utility model embodiment is provided with: an axle hole 1, the axle hole 1 is arranged at the center of the rotor lamination, and the axle hole 1 penetrates the rotor lamination and is arranged;A plurality of magnet grooves 2, each magnet groove 2 penetrates the rotor lamination and is arranged, and the plurality of magnet grooves 2 are sequentially and spacedly arranged along the circumference of the rotor lamination;For any one magnet groove 2, it comprises a first groove section 21 and a second groove section 22, and the extension directions of the first groove section 21 and the second groove section 22 are different;One or more magnetic separation holes 3, wherein for any one magnetic separation hole 3, it is arranged between the axle hole 1 and one magnet groove 2, a preset axis passes through the magnetic separation hole 3, the preset axis is located between the first groove section 21 and the second groove section 22 of the magnet groove 2, the preset axis passes through the center of the axle hole 1, and the maximum length of the magnetic separation hole 3 along the radial direction of the rotor lamination is greater than the maximum length of the magnetic separation hole 3 along the tangential direction of the rotor lamination.The rotor lamination with this structure design, by designing the magnetic separation hole 3 between the magnet groove 2 and the axle hole 1, and the length of the magnetic separation hole 3 along the radial direction of the rotor lamination is greater than the length along the tangential direction, the magnetic flux between the magnetic separation hole 3 and the magnet groove 2 is saturated, so that the magnetic force line is not easy to pass through from here, thereby better separating the magnetic field between the first groove section 21 and the second groove section 22 of the same magnet groove 2, reducing the magnetic leakage between the two magnets in the same magnet groove 2, blocking the circumferential diffusion of the magnetic force line between the adjacent magnetic poles, so that the magnetic force line distribution between the adjacent magnetic poles is more compact and uniform, which is conducive to improving the back electromotive force of the permanent magnet motor, thereby reducing the motor loss and improving the motor efficiency, and solving the technical problem that the efficiency of the permanent magnet motor in the related art is difficult to further improve.

[0055] For ease of description, spatial relative terms such as "above", "upper", "top", "bottom", and the like can be used herein to describe the spatial relationship between one device or feature and another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "above" the other device or structure will be positioned "below" or "below" the other device or structure. 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 spatial relative descriptions used herein are interpreted accordingly.

[0056] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0057] It is to be understood that the terms "first", "second", and the like, used herein do not necessarily connote any order, quantity, composition, or importance, but are used to distinguish one element from another, and do not necessarily indicate a requirement or order. It is to be understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0058] The preferred embodiments of the present application have been described above with the aid of drawing figures, and are not limited to those embodiments per se, but can be modified in various ways. It will be apparent to persons skilled in the art that the present application can be implemented in other specific forms without departing from the spirit or essential character thereof. Any modifications, equivalent replacements, improvements, and the like made within the spirit and principles of the present application are intended to be included in the scope of the present application.

Claims

1. A rotor lamination, characterized by The rotor lamination is provided with: an axle hole (1) arranged at the center of the rotor lamination, the axle hole (1) penetrating the rotor lamination; a plurality of magnet grooves (2), each of the magnet grooves (2) penetrating the rotor lamination, the plurality of magnet grooves (2) being arranged in sequence along the circumference of the rotor lamination, for any one of the magnet grooves (2), comprising a first groove section (21) and a second groove section (22), the first groove section (21) and the second groove section (22) having different extension directions; one or more magnetic isolation holes (3), for any one of the magnetic isolation holes (3), being arranged between the axle hole (1) and one of the magnet grooves (2), and a preset axle line penetrating the magnetic isolation hole (3), the preset axle line being located between the first groove section (21) and the second groove section (22) of the magnet groove (2), the preset axle line penetrating the center of the axle hole (1), the maximum length of the magnetic isolation hole (3) along the radial direction of the rotor lamination being greater than the maximum length of the magnetic isolation hole (3) along the tangential direction of the rotor lamination.

2. The rotor lamination of claim 1, wherein, The magnetic isolation hole (3) is a plurality of magnetic isolation holes (3) corresponding to a plurality of magnet grooves (2).

3. The rotor lamination of claim 1, wherein, For any one of the magnetic isolation holes (3), it satisfies 0.3≤S1 / (L2*L3)≤1, wherein S1 is the area of the magnetic isolation hole (3), L2 is the maximum length of the magnetic isolation hole (3) along the radial direction of the rotor lamination, and L3 is the maximum length of the magnetic isolation hole (3) along the tangential direction of the rotor lamination.

4. The rotor lamination of claim 1, wherein, For any one of the magnetic isolation holes (3), the distance L5 between the magnetic isolation hole (3) and the corresponding magnet groove (2) satisfies 0.4mm≤L5≤1.5mm.

5. The rotor lamination of claim 1, wherein, The rotor lamination structure satisfies 3.5mm≤L1-R1≤9mm, wherein L1 is the minimum distance between any one of the magnetic isolation holes (3) and the center of the axle hole (1), and R1 is the radius of the axle hole (1).

6. The rotor lamination of claim 1, wherein, Along the tangential direction of the rotor lamination, the maximum length of the magnet groove (2) is L4, and along the tangential direction of the rotor lamination, the maximum length of the magnetic isolation hole (3) is L3, wherein 0.1≤L3 / L4≤0.

5.

7. The rotor lamination of any of claims 1 to 6, wherein, The magnetic isolation hole (3) is rectangular, trapezoidal, arc-shaped or irregularly shaped.

8. The rotor lamination of any one of claims 1 to 6, wherein, For any one of the magnet grooves (2), the first groove section (21) and the second groove section (22) are in communication, and the connection between the first groove section (21) and the second groove section (22) is arranged protruding towards the axle hole (1).

9. The rotor lamination of any one of claims 1 to 6, wherein, For any one of the magnetic isolation holes (3), the area S1 satisfies 10mm 2 ≤ S1 ≤ 40mm 2 , and the radius R1 of the shaft hole (1) satisfies 6mm ≤ R1 ≤ 9mm.

10. A permanent magnet electric machine characterized by, The rotor core of the permanent magnet motor comprises a plurality of rotor laminations arranged in sequence, wherein the rotor lamination is the rotor lamination of any one of claims 1 to 9.

Images