Rotor punchings, rotors, motors and dies

Abstract

The present invention proposes a rotor punching, a rotor, a motor and a mold, wherein the rotor punching comprises: a plurality of slots, each slot is arranged along the radial direction of the rotor punching, and the slot is used to install a ferromagnet; there is a first angle between any two adjacent slots, and among the plurality of first angles, at least one first angle is smaller than the other first angles. Through the technical solution of the present invention, certain harmonics of the air gap magnetic density are effectively offset; the overall magnetic pole offset is used to achieve the skewed pole effect, and the rotor does not need to be segmented; further, the technical solution can also reduce the cogging torque, torque pulsation, and improve the power density of the motor. Compared with the rotor punchings in the structures of special magnetized magnetic steel, segmented skewed pole rotor, etc., the rotor punching of the technical solution also has the advantages of simple process, convenient manufacturing, and convenient mass production.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor punching sheet, a rotor, a motor and a mold. Background Art

[0002] Cogging torque and torque pulsation are one of the main factors affecting motor vibration and noise. Traditional permanent magnet motor rotors often use segmented skew poles to reduce motor cogging torque and torque pulsation, but this method is difficult to magnetize and assemble, the process is complex, and mass production is difficult to achieve. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, an object of the present invention is to provide a rotor punching sheet.

[0005] Another object of the present invention is to provide a rotor.

[0006] Another object of the present invention is to provide a motor.

[0007] Another object of the present invention is to provide a mold.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the first aspect of the present invention provides a rotor punching, including: a plurality of slots, each slot is arranged along the radial direction of the rotor punching, and the slot is used to install a ferromagnet; there is a first angle between any two adjacent slots, and among the multiple first angles, at least one first angle is smaller than the other first angles.

[0009] In this technical solution, by setting at least one first angle to be smaller than other first angles, after the ferromagnet is installed on the slot, at least one pole arc can be smaller than other pole arcs, so that the area of ​​the q-axis region corresponding to the smaller pole arc is smaller than the area of ​​other q-axis regions, thereby achieving mutual cancellation of certain air gap magnetic flux harmonics; at the same time, the ferromagnet with such a structural arrangement can achieve the skewed pole effect by overall magnetic pole offset, and the rotor does not need to be segmented; further, the technical solution can also reduce the motor tooth slot torque and motor losses through this skewed pole structure, thereby improving the motor efficiency; it can also reduce tooth harmonics, reduce torque pulsation, and increase motor power density, thereby reducing the vibration noise of the motor; at the same time, compared with rotor punchings in structures such as special magnetized magnetic steel and segmented skewed pole rotors, the rotor punchings of this technical solution have the advantages of simple process, convenient manufacturing, and easy mass production.

[0010] It can be understood that the radially arranged slots make the rotor formed after the ferromagnets are installed to have a tangential structure, which is simple in structure and easy to assemble.

[0011] In the above technical solution, the number of slots is an even number.

[0012] In this technical solution, the number of slots is set to an even number, which is convenient for installing an even number of ferromagnets and can ensure that the number of magnetic poles is also an even number, so that the smallest magnet can be used to provide the largest magnetic field, improve energy utilization, and ensure the force balance of the rotor and stability during operation.

[0013] In the above technical solution, the plurality of grooves are distributed in an axisymmetric manner.

[0014] In this technical solution, multiple slots are distributed axially symmetrically, which is beneficial to ensure the force balance and stability of the rotor during operation and improve energy utilization.

[0015] In the above technical solution, a plurality of centrally symmetrically distributed slots are evenly divided into an even number of slot groups, and each slot group and its adjacent slot group are offset in opposite directions by the same preset angle, so that the plurality of slots are axially symmetrically distributed, wherein the plurality of slots in each slot group are continuously arranged along the circumference of the rotor punching sheet.

[0016] In this technical solution, multiple slots distributed in a centrally symmetrical manner are divided into an even number of slot groups, and each slot group and its adjacent slot group are offset in opposite directions by the same angle. The axially symmetrical structure formed by such multiple slots can more effectively reduce the tooth torque and torque pulsation, improve the power density of the motor, and has a simple structure and is easy to process.

[0017] In any of the above technical solutions, a plurality of grooves are arranged along the circumferential direction of the rotor punching sheet.

[0018] In this technical solution, multiple slots are arranged along the circumference of the rotor punching sheet, that is, each slot is continuous in the radial direction, avoiding the appearance of multiple slots arranged radially, which can simplify the structure and improve production efficiency.

[0019] The technical solution of the second aspect of the present invention provides a rotor, comprising a plurality of rotor punchings of any one of the technical solutions of the first aspect; and a plurality of ferromagnets, each ferromagnet being installed in a slot of a rotor punching.

[0020] In this technical solution, by arranging the rotor punching sheet of any one of the technical solutions in the first aspect in the rotor, the rotor in this technical solution has all the beneficial effects of the above technical solutions, which will not be repeated here.

[0021] In the above technical solution, in two adjacent ferromagnetic bodies, the magnetic poles close to each other along the circumferential direction of the rotor have the same polarity.

[0022] In this technical solution, in two adjacent ferromagnetic bodies, the magnetic poles on the side close to each other along the circumference of the rotor have the same polarity, that is, the polarities of adjacent magnetic poles are the same, or in other words, the ferromagnetic bodies are placed alternately with polarity along the circumference of the rotor, which is beneficial to reducing the cogging torque and torque pulsation.

[0023] In the above technical solution, a plurality of ferromagnets are installed continuously in the same slot group of the rotor punching sheet.

[0024] In this technical solution, multiple ferromagnets are installed continuously, which is beneficial to improving the working stability of the rotor.

[0025] In the above technical solution, the plurality of ferromagnetic bodies are distributed in an axisymmetric manner.

[0026] In this technical solution, through the axially symmetrical distribution of multiple ferromagnets, the magnetism of the ferromagnets can be fully utilized, the energy utilization rate can be improved, and the stability and reliability of the rotor operation can be further improved.

[0027] The technical solution of the third aspect of the present invention provides a motor, comprising: a rotor of any one of the technical solutions of the second aspect.

[0028] By adopting the rotor of any one of the technical solutions in the second aspect above, the motor of this technical solution has all the beneficial effects of the above technical solutions, which will not be repeated here.

[0029] The technical solution of the fourth aspect of the present invention provides a mold for manufacturing a rotor punching sheet including any one of the technical solutions of the first aspect, and the mold is provided with a protrusion corresponding to the groove of the rotor punching sheet.

[0030] In this technical solution, the mold for the rotor punching sheet of any one of the technical solutions in the first aspect above has a simple structure and is easy to process.

[0031] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a rotor punching sheet according to an embodiment of the present invention;

[0033] Figure 2 is a schematic diagram of a slot offset structure of a rotor punching sheet according to an embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of the back EMF harmonic content of a skewed-pole rotor and a symmetrical rotor according to an embodiment of the present invention;

[0035] Figure 4 A comparison diagram of the electromagnetic torque waveforms of a skewed-pole rotor and a symmetrical rotor in one embodiment of the present invention.

[0036] in, Figure 1 to Figure 2 The corresponding relationship between the reference numerals and component names in the figure is:

[0037] 10 rotor punchings, 12 slots, 120a the first slot, 121a the second slot, 122a the third slot, 123a the fourth slot, 120b the fifth slot, 121b the sixth slot, 122b the seventh slot, 123b the eighth slot. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0040] Refer to the following Figures 1 to 4 Some embodiments according to the invention are described.

[0041] like Figure 1 As shown, a rotor punching sheet 10 according to an embodiment of the present invention comprises: a plurality of slots 12, each slot 12 is arranged along the radial direction of the rotor punching sheet 10, and the slots 12 are used to install ferromagnets; there is a first angle between any two adjacent slots 12, and among the plurality of first angles, at least one first angle is smaller than the other first angles.

[0042] like Figure 1 As shown, in this embodiment, by setting at least one first angle to be smaller than other first angles, that is, the multiple slots 12 on the rotor punching sheet 10 form a non-center-symmetrical structure, so that after the ferromagnet is installed on the slot 12, at least one pole arc can be smaller than the other pole arcs, so that the area of ​​the q-axis region corresponding to the smaller pole arc is smaller than the area of ​​the other q-axis region, thereby achieving mutual cancellation of certain air gap magnetic flux harmonics; at the same time, the ferromagnet with such a structural arrangement can achieve the skewed pole effect by the overall magnetic pole offset, so as to reduce the motor tooth slot torque, reduce the motor loss, and thus improve the motor efficiency; and the rotor does not need to be segmented; further, this embodiment can also reduce tooth harmonics, reduce torque pulsation, and increase the motor power density, thereby reducing the vibration noise of the motor; at the same time, compared with the rotor punching sheet 10 in structures such as special magnetized magnetic steel and segmented skewed pole rotor, the rotor punching sheet 10 of this embodiment has the advantages of simple process, convenient manufacturing, and convenient mass production.

[0043] It can be understood that the radially arranged slots 12 make the rotor formed after the ferromagnets are installed a tangential structure, which is simple in structure and easy to assemble.

[0044] The ferromagnetic material in this embodiment includes at least one of a magnet and a magnetic steel.

[0045] In the above-described embodiment, the number of the slots 12 is an even number.

[0046] In this embodiment, the number of slots 12 is set to an even number, which is convenient for installing an even number of ferromagnets and can ensure that the number of magnetic poles is also an even number, so that the smallest magnet can be used to provide the largest magnetic field, improve energy utilization, and ensure the force balance of the rotor and stability during operation.

[0047] Of course, in some embodiments, the number of slots 12 may be set to an odd number to meet special needs.

[0048] In the above embodiment, the plurality of grooves 12 are distributed in an axisymmetric manner.

[0049] In this embodiment, the plurality of slots 12 are distributed in an axisymmetric manner, which is beneficial to ensuring the force balance and stability of the rotor during operation and improving energy utilization.

[0050] like Figure 2 As shown, in the above embodiment, a plurality of slots 12 distributed in a centrally symmetrical manner are evenly divided into an even number of slot groups, and each slot group and its adjacent slot group are offset in opposite directions by the same preset angle, so that the plurality of slots 12 are distributed in an axially symmetrical manner, wherein the plurality of slots 12 in each slot group are continuously arranged along the circumference of the rotor punching 10.

[0051] In this embodiment, the multiple slots 12 distributed in a centrally symmetrical manner are divided into an even number of slot groups, and each slot group and the adjacent slot group are offset in opposite directions by the same angle. The axially symmetrical structure formed by such multiple slots 12 can more effectively reduce the tooth torque and torque pulsation and improve the power density of the motor, and it has a simple structure and is easy to process.

[0052] Figure 2 FIG. 1 shows a schematic diagram of the offset of the rotor punching 10 in this embodiment. Specifically, as Figure 2 As shown, the centrosymmetric rotor punching 10 is taken as the standard, and the centrosymmetric rotor punching 10 has four cross-shaped slots 12, which are the fifth slot 120b, the sixth slot 121b, the seventh slot 122b, and the eighth slot 123b. Figure 2As shown in the dotted ellipse in FIG, the fifth groove 120b and the eighth groove 123b are a groove group, and the sixth groove 121b and the seventh groove 122b are a groove group; the fifth groove 120b and the eighth groove 123b are offset by an angle d in the counterclockwise direction (as shown by the arrow), so that the fifth groove 120b is offset to the position of the first groove 120a, and the eighth groove 123b is offset to the position of the fourth groove 123a; the sixth groove 121b and the seventh groove 122b are offset by an angle d in the clockwise direction (as shown by the arrow), so that the sixth groove 121b is offset to the position of the second groove 121a, and the seventh groove 122b is offset to the position of the third groove 122a, thereby forming a new axisymmetric structure, that is, Figure 1 The structure of the rotor lamination 10 is shown.

[0053] Of course, the embodiments of the present application are not limited thereto, and the angles of offset in opposite directions of two adjacent slot groups are not necessarily exactly the same. For example, the offset angle of the fifth slot 120b and the eighth slot 123b is d1 (e.g., 5°), and the offset angle of the sixth slot 121b and the seventh slot 122b is d2 (e.g., 10°), and the offset structure is still an axisymmetric structure.

[0054] Furthermore, for the division of slot groups, each slot 12 can also be a separate slot group, for example, the fifth slot 120b, the sixth slot 121b, the seventh slot 122b, and the eighth slot 123b mentioned above are each a slot group, wherein the fifth slot 120b is offset counterclockwise, the sixth slot 121b is offset clockwise, the seventh slot 122b is offset counterclockwise, and the eighth slot 123b is offset clockwise, which can also form an axially symmetrical structure.

[0055] It should be noted that the multiple slots 12 in the same slot group are arranged continuously along the circumference of the rotor punching 10, which ensures that the multiple slots 12 in each slot group are continuous rather than arranged at intervals. This structure is simple and easy to produce.

[0056] In any of the above embodiments, the plurality of grooves 12 are arranged along the circumferential direction of the rotor sheet 10 .

[0057] In this embodiment, a plurality of slots 12 are arranged along the circumference of the rotor punching 10, that is, each slot 12 is continuous in the radial direction, thus avoiding the occurrence of a plurality of slots 12 arranged radially, thereby simplifying the structure and improving production efficiency.

[0058] An embodiment of the second aspect of the present invention provides a rotor, comprising a plurality of rotor punchings 10 according to any one of the embodiments of the first aspect; and a plurality of ferromagnets, each ferromagnet being installed in a slot 12 of a rotor punching 10 .

[0059] In this embodiment, by setting the rotor punching 10 of any one of the embodiments in the first aspect in the rotor, the rotor in this embodiment has all the beneficial effects of the above embodiments, which will not be described in detail here.

[0060] In the above embodiment, the magnetic poles of two adjacent ferromagnetic bodies that are close to each other along the circumferential direction of the rotor have the same polarity.

[0061] In this embodiment, of two adjacent ferromagnetic bodies, the magnetic poles on the sides close to each other along the circumference of the rotor have the same polarity, that is, the adjacent magnetic poles have the same polarity, or, in other words, the ferromagnetic bodies are placed alternately with polarity along the circumference of the rotor, that is, the magnetic poles N and the magnetic poles N are adjacent, and the magnetic poles S and the magnetic poles S are adjacent, which is helpful to reduce the cogging torque and torque pulsation.

[0062] In the above-mentioned embodiment, a plurality of ferromagnetic bodies are installed continuously in the same slot group of the rotor sheet 10 .

[0063] In this embodiment, a plurality of ferromagnets are installed continuously, which is beneficial to improving the working stability of the rotor.

[0064] It can be understood that in the entire rotor punching sheet 10 , preferably, a plurality of ferromagnets are installed continuously, that is, a ferromagnet is installed in each slot 12 , and there is no empty slot 12 .

[0065] Of course, optionally, the ferromagnets can also be installed at intervals, that is, in the plurality of slots 12, only one ferromagnet is installed in every other slot 12, or in other words, there is an empty slot 12 between two adjacent ferromagnets, so that while ensuring that the plurality of ferromagnets can still form an axisymmetric structure, the specifications and models of the rotor punchings 10 can be reduced, the inventory can be reduced, and the production process can be simplified. For example, on a rotor punching 10 with eight slots 12, 2, 4, 6 or 8 ferromagnets can be installed, so that only rotor punchings 10 with eight slots 12 need to be produced, thereby facilitating mass production.

[0066] In the above embodiment, the plurality of ferromagnetic bodies are distributed in an axisymmetric manner.

[0067] In this embodiment, the axially symmetrical distribution of multiple ferromagnets can fully utilize the magnetism of the ferromagnets, improve energy utilization, and further improve the stability and reliability of the rotor operation.

[0068] An embodiment of the third aspect of the present invention provides a motor, comprising: a rotor according to any one of the embodiments of the second aspect.

[0069] By adopting the rotor of any one of the embodiments in the second aspect above, the motor of this embodiment has all the beneficial effects of the above embodiments, which will not be described in detail here.

[0070] It can be understood that the motor in the present application includes at least any one of an AC permanent magnet synchronous motor and generator, a DC permanent magnet synchronous motor and generator, and a permanent magnet synchronous motor and generator of a DC brushless motor.

[0071] An embodiment of the fourth aspect of the present invention provides a mold for manufacturing a rotor punching 10 including any one of the embodiments of the first aspect, and the mold is provided with a protrusion corresponding to the groove 12 of the rotor punching 10.

[0072] In this embodiment, by adopting the mold for the rotor punching 10 of any one of the embodiments of the first aspect, the structure of the mold is simple, and the processing of the rotor punching 10 is more convenient.

[0073] like Figure 1 As shown, according to a specific embodiment of the present invention, the integral skewed pole rotor of the permanent magnet motor has a tangential structure, and the rotor punching 10 includes an even number of asymmetrically distributed slots 12, and the slots 12 are used to place magnetic steel; the magnetic steel structure corresponding to each magnetic steel slot 12 is completely consistent, and each magnetic steel is alternately placed along the circumferential direction of the rotor; the even number of magnetic steels are evenly divided into Z groups (Z is greater than 1), and the magnetic steels (h) in each group must be a number of continuous magnetic steels along the circumferential direction; as shown in FIG. Figure 2 As shown, taking the tangential permanent magnet rotor with a central symmetrical structure as a reference, the skew-pole rotor is offset by an angle d along the center line of the magnetic steel. The offset angle of the magnetic steel in the same group is consistent with the offset direction and is opposite to the offset direction of the magnetic steel in the adjacent group, but the angle is consistent.

[0074] By adopting the rotor punching of the above-mentioned specific embodiment, the magnetic poles of half of the rotor are inclined in the opposite direction to the magnetic poles of the other half; the areas of the q-axis regions corresponding to some pole arcs are not equal, which can achieve mutual cancellation of certain air gap magnetic flux harmonics; the permanent magnets arranged in this structure can achieve the skewed pole effect by overall magnetic pole offset, and the rotor does not need to be segmented; in addition, while being able to reduce the cogging torque, torque pulsation, and improve the power density of the motor, the present application has the advantages of simple process and convenient manufacturing compared to structures such as special magnetized magnetic steel and segmented skewed pole rotors.

[0075] Figure 3 A schematic diagram of the back EMF harmonic content of the skew-pole rotor and the symmetrical rotor in this specific embodiment is shown; Figure 4 A comparison diagram of the electromagnetic torque waveforms of the skew-pole rotor and the symmetrical rotor in this specific embodiment is shown.

[0076] The technical scheme of the present invention is described in detail above in combination with the accompanying drawings. Through the technical scheme of the present invention, the mutual cancellation of certain harmonics of the air gap magnetic density is effectively achieved; at the same time, the ferromagnetic body with such a structural arrangement can achieve the skewed pole effect by the overall magnetic pole offset, and the rotor does not need to be segmented; further, the present technical scheme can also reduce the cogging torque, torque pulsation, and improve the power density of the motor. At the same time, compared with the rotor punchings in structures such as special magnetized magnetic steel and segmented skewed pole rotors, the rotor punchings of the present technical scheme have the advantages of simple process, convenient manufacturing, and easy mass production.

[0077] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0079] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor punching, characterized in that: include: A plurality of slots, each of which is arranged along the radial direction of the rotor punching sheet, and the slot is used to install a ferromagnetic body; There is a first angle between any two adjacent grooves, and among a plurality of the first angles, at least one of the first angles is smaller than the other first angles; The plurality of centrally symmetrically distributed grooves are evenly divided into an even number of groove groups, and each groove group and the adjacent groove group are offset in opposite directions by the same preset angle, so that the plurality of grooves are axially symmetrically distributed. Wherein, the multiple slots in each slot group are arranged continuously along the circumferential direction of the rotor punching sheet, and the multiple slots in each slot group are continuous.

2. The rotor punching according to claim 1, characterized in that: The number of the slots is an even number.

3. The rotor punching according to claim 1 or 2, characterized in that: The plurality of grooves are arranged along the circumferential direction of the rotor punching sheet.

4. A rotor, characterized in that: include: A plurality of rotor punchings according to any one of claims 1 to 3; A plurality of ferromagnets are provided, each ferromagnet being installed in a slot of a rotor punching sheet.

5. The rotor according to claim 4, characterized in that In two adjacent ferromagnetic bodies, magnetic poles close to each other along the circumferential direction of the rotor have the same polarity.

6. The rotor according to claim 4, characterized in that In the same slot group of the rotor punching sheet, a plurality of the ferromagnetic bodies are installed continuously.

7. The rotor according to claim 4, characterized in that The plurality of ferromagnetic bodies are distributed in an axisymmetric manner.

8. A motor, characterized in that: include: A rotor as claimed in any one of claims 4 to 7.

9. A mold for making a rotor punching sheet according to any one of claims 1 to 3, characterized in that: The mold is provided with protrusions corresponding to the grooves of the rotor punching sheets.

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