A rotor for an electric motor

Abstract

The present invention discloses a rotor for a motor, comprising a plurality of stacked rotor sheets, the rotor sheets are annular, a plurality of permanent magnet units are arranged circumferentially of the rotor sheets, the permanent magnet units have a first hole position and a second hole position, the first hole position and the second hole position are used to install permanent magnets, the first hole position and the second hole position are arranged in a V-shape, the small end of the V-shape faces the center of the rotor sheet, the center line of the V-shape is arranged along the radial direction of the rotor sheet, the permanent magnet unit also has a third hole position, the third hole position is filled with a low magnetic permeability material, the third hole position is located between the first hole position and the second hole position, the third hole position is located on the side of the first hole position and the second hole position close to the center of the rotor sheet, a first magnetic bridge exists between the third hole position and the first hole position, the first magnetic bridge is in the shape of a long strip, the first magnetic bridge is arranged obliquely, and one end of the first magnetic bridge faces between the first hole position and the second hole position. A rotor for a motor of the present invention can improve the strength of the magnetic bridge, reduce fracture, and extend the life of the rotor and the motor.

Description

Technical Field

[0001] The invention relates to the structure of a motor, and in particular to a rotor used in a motor. Background Art

[0002] The rotor is the core component of the motor, and usually has multiple stacked rotor plates. The rotor plates are in the shape of a ring, and multiple permanent magnet units are evenly distributed along the circumference of the rotor plates.

[0003] At the same time, there are two holes at the permanent magnet unit, and one permanent magnet is installed in one hole.

[0004] Due to the volume, the two permanent magnets penetrate multiple rotor sheets at the same time, and the two permanent magnets are arranged in a V shape, with the large end of the V facing the outside of the rotor sheet.

[0005] Therefore, the rotor plate forms a "Ⅰ" or "Ⅱ" axial magnetic bridge between the two permanent magnets. The magnetic bridge has a simple structure.

[0006] However, existing magnetic bridges have low strength and are prone to breakage, which shortens the life of the rotor and the motor. Summary of the invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a rotor for a motor, which can improve the strength of the magnetic bridge, reduce fracture, and extend the life of the rotor and the motor.

[0008] According to a first aspect of the present invention, a rotor for a motor includes a plurality of stacked rotor sheets, the rotor sheets are annular, and a plurality of permanent magnet units are arranged circumferentially on the rotor sheets. The permanent magnet units have a first hole position and a second hole position, the first hole position is used to install a permanent magnet, and the second hole position is used to install another permanent magnet, the first hole position and the second hole position are arranged in a V-shape, the small end of the V-shape faces the center of the rotor sheet, and the center line of the V-shape is arranged along the radial direction of the rotor sheet, the permanent magnet unit further has a third hole position, the third hole position is filled with a low magnetic permeability material, the third hole position is located between the first hole position and the second hole position, the third hole position is located on the side of the first hole position and the second hole position close to the center of the rotor sheet, a first magnetic bridge exists between the third hole position and the first hole position, the first magnetic bridge is in the shape of a long strip, the first magnetic bridge is tilted, and one end of the first magnetic bridge faces between the first hole position and the second hole position.

[0009] According to some embodiments of the present invention, there is a second magnetic bridge between the third hole position and the second hole position, and the second magnetic bridge and the first magnetic bridge are arranged in a V shape, and the large ends of the V shape of the first magnetic bridge and the second magnetic bridge face the center of the rotor plate.

[0010] According to some embodiments of the present invention, the rotor plate has a fourth hole, the fourth hole is filled with low magnetic permeability material, the fourth hole is located between the first hole and the second hole, the fourth hole is located on the side of the third hole away from the center of the rotor plate, there is a third magnetic bridge between the fourth hole and the third hole, and the third magnetic bridge connects the first magnetic bridge and the second magnetic bridge.

[0011] According to some embodiments of the present invention, the first hole is in a strip shape, and a first biasing portion is disposed at one end of the first hole, and the first biasing portion is used to form the first magnetic bridge.

[0012] According to some embodiments of the present invention, the first biasing portion is a right-angled trapezoid, and the hypotenuse of the right-angled trapezoid is used to form the first magnetic bridge.

[0013] According to some embodiments of the present invention, the right-angled trapezoid has a first right-angle position, the first right-angle position is arranged opposite to the first magnetic bridge, and the first right-angle position is located at the connection between the first biasing portion and the first hole position.

[0014] According to some embodiments of the present invention, the rotor sheet has a fourth hole, the fourth hole is filled with a low magnetic permeability material, the fourth hole is located between the first hole and the second hole, the fourth hole is located on the side of the third hole away from the center of the rotor sheet, and a fourth magnetic bridge is formed between the first bias portion and the fourth hole.

[0015] According to some embodiments of the present invention, the first biasing portion is filled with a low magnetic permeability material.

[0016] According to some embodiments of the present invention, a second offset portion is disposed at the other end of the first hole, and the second offset portion is offset along the width direction of the first hole.

[0017] According to some embodiments of the present invention, the width of the second offset portion is greater than the width of the first hole, and a first protrusion is provided at the connection between the second offset portion and the first hole.

[0018] A rotor for a motor according to an embodiment of the present invention has at least the following beneficial effects:

[0019] 1. The present invention sets a first magnetic bridge so that the first magnetic bridge is in the shape of a long strip. The first magnetic bridge is set obliquely, and one end of the first magnetic bridge faces between the first hole position and the second hole position. Therefore, the first magnetic bridge has a longer length in both the radial and circumferential directions of the rotor plate. That is, the present invention makes the first magnetic bridge have a longer length in both the D-axis and the Q-axis, thereby improving the ability of the first magnetic bridge to withstand centrifugal force and steering force, which is equivalent to improving the strength of the first magnetic bridge, making the first magnetic bridge itself and the two ends less likely to deform and crack, thereby improving the durability of the rotor plate and extending the life of the rotor and the motor.

[0020] 2. The present invention sets the first magnetic bridge so that the first magnetic bridge is set at an angle, thereby increasing the low magnetic permeability material of the third hole in the radial and circumferential directions of the rotor sheet, especially increasing the low magnetic permeability material of the third hole in the radial direction of the rotor sheet, that is, increasing the low magnetic permeability material of the third hole in the D-axis direction of the motor rotor, thereby increasing the D-axis magnetic resistance of the permanent magnet motor rotor and improving the motor output.

[0021] 3. The present invention sets the first magnetic bridge so that the first magnetic bridge is set at an angle, and also increases the volume of the third hole in the magnetic pole direction of the permanent magnet. Therefore, the low magnetic permeability material of the third hole in the magnetic pole direction of the corresponding permanent magnet increases, thereby reducing the magnetic conductivity of the rotor magnetic pole at a 90-degree position, and can further generate a larger motor reluctance torque, which is beneficial to reducing consumables in the motor production process, especially permanent magnets, and further reducing the corresponding rare earth materials and saving resources.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic structural diagram of a rotor used in a motor according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A partially enlarged structural schematic diagram of a rotor for a motor is shown;

[0026] Figure 3 for Figure 1 A schematic diagram of a magnetic field of a rotor used in an electric motor is shown.

[0027] Figure numerals: 100 - rotor plate, 110 - permanent magnet unit, 120 - first hole position, 130 - second hole position, 140 - third hole position, 150 - first magnetic bridge, 160 - second magnetic bridge, 170 - fourth hole position, 180 - third magnetic bridge, 190 - first biasing part, 200 - second biasing part, 210 - first bump. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] A rotor for a motor according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0033] Reference Figure 1 and Figure 2 , the present invention aims to provide an embodiment of a rotor for an electric motor.

[0034] Structurally, the rotor of this embodiment includes a plurality of stacked rotor sheets 100 , wherein the rotor sheets 100 are annular in shape, and a plurality of permanent magnet units 110 are arranged circumferentially of the rotor sheets 100 .

[0035] Specifically, refer to Figure 1 and Figure 2 In this embodiment, the permanent magnet unit 110 has a first hole 120 and a second hole 130. The first hole 120 is used to install one permanent magnet, and the second hole 130 is used to install another permanent magnet.

[0036] In terms of layout, the first hole 120 and the second hole 130 are arranged in a V-shape, with the small end of the V-shape facing the center of the rotor plate 100 , and the center line of the V-shape is arranged along the radial direction of the rotor plate 100 .

[0037] For the first hole 120, the first hole 120 is in the shape of an elongated strip, and the permanent magnet installed in the first hole 120 is in the shape of a plate, and the magnetic poles are arranged in the thickness direction of the permanent magnet, which increases the distribution area of ​​the magnetic poles and provides a larger magnetic field to meet the functional requirements of the motor for the rotor.

[0038] In some specific embodiments of the present invention, a first biasing portion 190 may be disposed at one end of the first hole 120 , and the first biasing portion 190 is used to form a first magnetic bridge 150 .

[0039] It is easy to understand that in this embodiment, by setting the first biasing portion 190 , the first biasing portion 190 cooperates to form the first magnetic bridge 150 , which not only meets the requirement of setting the first magnetic bridge 150 , but also does not affect the installation of the permanent magnet, and the structure is simple.

[0040] In some specific embodiments of the present invention, the first biasing portion 190 may be a right-angled trapezoid, and the hypotenuse of the right-angled trapezoid is used to form the first magnetic bridge 150 .

[0041] It is easy to know that the first biasing portion 190 is a right-angled trapezoid, and thus the first biasing portion 190 is likely to have a hypotenuse, thereby facilitating the formation of the inclined first magnetic bridge 150 , which is simple to manufacture and easy to implement.

[0042] Furthermore, the first offset portion 190 is a right-angled trapezoid, which is easy to process during punching and has high dimensional accuracy and positional accuracy, which is beneficial to improving the consistency of the rotor sheet 100 and facilitating stacking and assembly.

[0043] In some specific embodiments of the present invention, the right-angled trapezoid may have a first right angle, which is arranged opposite to the first magnetic bridge 150 and is located at the connection between the first biasing portion 190 and the first hole 120 .

[0044] It can be understood that in this embodiment, the first right angle of the right-angled trapezoid of the first biasing portion 190 is located at the connection between the first biasing portion 190 and the first hole position 120, so that the two straight sides of the first right angle are connected to the two opposite sides of the first hole position 120, thereby avoiding the first biasing portion 190 from obstructing the installation of the permanent magnet and facilitating assembly.

[0045] In some specific embodiments of the present invention, the first biasing portion 190 may be filled with a low magnetic permeability material.

[0046] It is easy to understand that in this embodiment, by providing a low magnetic permeability material in the first biasing portion 190 , the magnetic lines of force generated by the edge of the permanent magnet can be directly blocked, thereby increasing the magnetic resistance and meeting the functional requirements of the motor.

[0047] At the same time, the added low magnetic permeability material can limit the permanent magnet to prevent the permanent magnet from loosening.

[0048] In some specific embodiments of the present invention, a second offset portion 200 may be provided at the other end of the first hole 120 , and the second offset portion 200 is offset along the width direction of the first hole 120 .

[0049] It can be learned that, by providing the second biasing portion 200, this embodiment can not only facilitate the installation of the permanent magnet, but also further add low magnetic permeability materials to block the magnetic lines generated by the edge of the permanent magnet, increase the magnetic resistance, and meet the functional requirements of the motor.

[0050] In some specific embodiments of the present invention, the width of the second offset portion 200 may be greater than the width of the first hole 120 , and a first protrusion 210 is disposed at the connection between the second offset portion 200 and the first hole 120 .

[0051] It is very beneficial that, in this embodiment, by providing the first protrusion 210 , the permanent magnet can be positioned so that the permanent magnet is evenly distributed on the rotor plate 100 to avoid eccentricity.

[0052] In some specific embodiments of the present invention, the permanent magnet unit 110 may further have a third hole 140, the third hole 140 is filled with a low magnetic permeability material, the third hole 140 is located between the first hole 120 and the second hole 130, the third hole 140 is located on the side of the first hole 120 and the second hole 130 close to the center of the rotor plate 100, and there is a first magnetic bridge 150 between the third hole 140 and the first hole 120, the first magnetic bridge 150 is in the shape of a long strip, the first magnetic bridge 150 is tilted, and one end of the first magnetic bridge 150 faces between the first hole 120 and the second hole 130.

[0053] In summary, firstly, in this embodiment, the first magnetic bridge 150 is arranged so that the first magnetic bridge 150 is in the shape of a long strip. The first magnetic bridge 150 is arranged obliquely, and one end of the first magnetic bridge 150 faces between the first hole position 120 and the second hole position 130. Therefore, the first magnetic bridge 150 has a longer length in both the radial and circumferential directions of the rotor plate 100. That is, the present invention enables the first magnetic bridge 150 to have a longer length in both the D-axis and the Q-axis, thereby improving the ability of the first magnetic bridge 150 to withstand centrifugal force and steering force, which is equivalent to improving the strength of the first magnetic bridge 150, so that the first magnetic bridge 150 itself and the two ends are not easy to deform and crack, thereby improving the durability of the rotor plate 100 and extending the life of the rotor and the motor.

[0054] Secondly, in terms of effect, refer to Figure 3 In this embodiment, the first magnetic bridge 150 is arranged so that the first magnetic bridge 150 is arranged tilted, thereby increasing the low magnetic permeability material of the third hole 140 in the radial and circumferential directions of the rotor sheet 100, and in particular, increasing the low magnetic permeability material of the third hole 140 in the radial direction of the rotor sheet 100, that is, increasing the low magnetic permeability material of the third hole 140 in the D-axis direction of the motor rotor, thereby increasing the D-axis magnetic resistance of the permanent magnet motor rotor and improving the motor output.

[0055] Furthermore, in this embodiment, the first magnetic bridge 150 is arranged to be inclined, and the volume of the third hole 140 in the magnetic pole direction of the permanent magnet is increased. Therefore, the low magnetic permeability material of the third hole 140 in the magnetic pole direction of the corresponding permanent magnet is increased, thereby reducing the magnetic conductivity of the rotor pole at the 90-degree position, which can further generate a larger motor reluctance torque, which is beneficial to reducing consumables in the motor production process, especially rare earth materials, and saving resources.

[0056] In some specific embodiments of the present invention, a second magnetic bridge 160 may be provided between the third hole 140 and the second hole 130 , and the second magnetic bridge 160 and the first magnetic bridge 150 are arranged in a V shape, with the large ends of the V-shape of the first magnetic bridge 150 and the second magnetic bridge 160 facing the center of the rotor plate 100 .

[0057] It is easy to understand that a second magnetic bridge 160 is set between the second hole 130 and the third hole 140, which also improves the magnetic field distribution and mechanical distribution between the second hole 130 and the third hole 140, thereby improving the overall strength and reluctance torque of the permanent magnet unit 110, making the performance of the rotor and the motor more beneficial and saving more materials.

[0058] In some specific embodiments of the present invention, the rotor plate 100 can have a fourth hole 170, the fourth hole 170 is filled with a low magnetic permeability material, the fourth hole 170 is located between the first hole 120 and the second hole 130, the fourth hole 170 is located on the side of the third hole 140 away from the center of the rotor plate 100, and there is a third magnetic bridge 180 between the fourth hole 170 and the third hole 140, and the third magnetic bridge 180 connects the first magnetic bridge 150 and the second magnetic bridge 160.

[0059] It is easy to know that in this embodiment, by setting the fourth hole 170, the magnetic lines of force of the portion close to the first hole 120 and the second hole 130 are conveniently blocked, the magnetic field distribution is improved, and the magnetic resistance torque is increased.

[0060] In some specific embodiments of the present invention, a fourth magnetic bridge may be formed between the first biasing portion 190 and the fourth hole 170 .

[0061] Therefore, the space of the fourth hole 170 can be appropriately increased to enhance the barrier effect, further increase the magnetic resistance torque, enhance the performance of the motor, reduce the requirements for permanent magnets, and reduce the use of rare earths.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A rotor for a motor, characterized in that: The invention comprises a plurality of stacked rotor sheets (100), wherein the rotor sheet (100) is in the shape of a ring, and a plurality of permanent magnet units (110) are arranged circumferentially of the rotor sheet (100), wherein the permanent magnet units (110) have a first hole position (120) and a second hole position (130), wherein the first hole position (120) is used to install a permanent magnet, and the second hole position (130) is used to install another permanent magnet, and the first hole position (120) and the second hole position (130) are arranged in a V-shape, wherein the small end of the V-shape faces the center of the rotor sheet (100), and the center line of the V-shape is arranged along the radial direction of the rotor sheet (100), and the permanent magnet units (110) further have a third hole position. (140), the third hole (140) is filled with a low magnetic permeability material, the third hole (140) is located between the first hole (120) and the second hole (130), the third hole (140) is located on the side of the first hole (120) and the second hole (130) close to the center of the rotor plate (100), a first magnetic bridge (150) is present between the third hole (140) and the first hole (120), the first magnetic bridge (150) is in the shape of a long strip, the first magnetic bridge (150) is tilted, and one end of the first magnetic bridge (150) faces between the first hole (120) and the second hole (130); A second magnetic bridge (160) is disposed between the third hole position (140) and the second hole position (130), the second magnetic bridge (160) and the first magnetic bridge (150) being arranged in a V shape, the large ends of the V shape of the first magnetic bridge (150) and the second magnetic bridge (160) facing the center of the rotor plate (100); The rotor plate (100) has a fourth hole (170), the fourth hole (170) is filled with a low magnetic permeability material, the fourth hole (170) is located between the first hole (120) and the second hole (130), the fourth hole (170) is located on a side of the third hole (140) away from the center of the rotor plate (100), a third magnetic bridge (180) is present between the fourth hole (170) and the third hole (140), the third magnetic bridge (180) connects the first magnetic bridge (150) and the second magnetic bridge (160); The first hole position (120) is in the shape of a long strip, and a first biasing portion (190) is provided at one end of the first hole position (120), and the first biasing portion (190) is used to form the first magnetic bridge (150); The rotor plate (100) has a fourth hole (170), the fourth hole (170) is filled with a low magnetic permeability material, the fourth hole (170) is located between the first hole (120) and the second hole (130), the fourth hole (170) is located on a side of the third hole (140) away from the center of the rotor plate (100), and a fourth magnetic bridge is formed between the first biasing portion (190) and the fourth hole (170).

2. A rotor for a motor according to claim 1, characterized in that: The first biasing portion (190) is a right-angled trapezoid, and the hypotenuse of the right-angled trapezoid is used to form the first magnetic bridge (150).

3. A rotor for a motor according to claim 2, characterized in that: The right-angled trapezoid has a first right-angle position, the first right-angle position is arranged opposite to the first magnetic bridge (150), and the first right-angle position is located at the connection between the first biasing portion (190) and the first hole position (120).

4. A rotor for a motor according to claim 1, characterized in that: The first biasing portion (190) is filled with a low magnetic permeability material.

5. A rotor for a motor according to claim 1, characterized in that: A second offset portion (200) is provided at the other end of the first hole position (120), and the second offset portion (200) is offset along the width direction of the first hole position (120).

6. A rotor for a motor according to claim 5, characterized in that: The width of the second offset portion (200) is greater than the width of the first hole (120), and a first protrusion (210) is provided at the connection between the second offset portion (200) and the first hole (120).

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