Rotor punching sheet, rotor structure, permanent magnet motor and pump

Abstract

The invention relates to a rotor punching sheet, a rotor structure, a permanent magnet motor and a pump, the pump comprises the permanent magnet motor, the permanent magnet motor comprises the rotor structure, the rotor structure comprises a rotor core and a permanent magnet, the rotor core is formed by rotating and laminating a plurality of rotor punching sheets, and each rotor punching sheet comprises an eccentric arc sheet, a magnetic leakage bridge and a punching sheet main body. P cavities are formed in the punching sheet body at intervals in the circumferential direction, an eccentric arc sheet is arranged in each cavity, the cavities are connected with the corresponding eccentric arc sheets through magnetic leakage bridges, asymmetric V-shaped magnetic steel grooves are formed between the eccentric arc sheets and the corresponding cavities, and the magnetic leakage bridges are located at the ends or corners of the magnetic steel grooves. The rotor iron core is formed by rotating and laminating the rotor punching sheets, so that the permanent magnets at different positions of the magnet grooves are alternately distributed, and the asymmetric V-shaped magnetic steel grooves are adopted, so that the strength of the rotor structure can be ensured, the magnetic leakage amount of the rotor structure can be reduced, and the use cost of the permanent magnets is reduced; and the manufacturing cost of the permanent magnet motor and the pump is also reduced.

Description

Technical Field

[0001] This invention relates to the field of pump technology, and in particular to a rotor lamination, rotor structure, permanent magnet motor and pump. Background Technology

[0002] Among existing permanent magnet motors, the embedded rotor structure is one of the most common. As the name suggests, the embedded rotor structure involves embedding permanent magnets within the magnet slots of the rotor core. To ensure the permanent magnets are securely embedded in the slots, leakage magnetic bridges are typically placed at both ends of the slots—that is, leakage magnetic bridges on both sides of the permanent magnet. However, the more leakage magnetic bridges there are, the greater the reduction in the magnetic properties of the rotor structure. To maintain the same output torque, more permanent magnets or higher-grade magnets are required, increasing both the cost of using permanent magnets and the manufacturing cost of the motor.

[0003] Therefore, there is an urgent need for a rotor lamination, rotor structure, permanent magnet motor, and pump to solve the above-mentioned technical problems. Summary of the Invention

[0004] The first objective of this invention is to provide a rotor lamination to at least solve one of the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides a rotor lamination, comprising: Eccentric arc plate; There are P leakage bridges, where P is the number of motor pole pairs greater than 1. The main body of the stamping has P cavities spaced apart along the circumference. Each cavity is provided with the eccentric arc plate, and the cavity and the corresponding eccentric arc plate are connected by the leakage magnetic bridge. An asymmetrical V-shaped magnetic groove is formed between the eccentric arc plate and the corresponding cavity, and each of the leakage magnetic bridges is located at the end or corner of the magnetic groove.

[0006] Furthermore, the magnetic steel channel includes a first magnetic steel channel and a second magnetic steel channel connected to each other. Both the first magnetic steel channel and the second magnetic steel channel are strip-shaped. The lengths of the first magnetic steel channel and the second magnetic steel channel are not equal. The connection position of the first magnetic steel channel and the second magnetic steel channel forms the corner position of the magnetic steel channel.

[0007] Furthermore, the eccentric arc plate has an eccentric circular arc, the angle between the length direction of the first magnetic groove and the line of symmetry O1A of the adjacent eccentric circular arc is Q1, and the angle between the length direction of the second magnetic groove and the line of symmetry O1A of the adjacent eccentric circular arc is Q2. The included angles Q1 and Q2 satisfy the following relationship: , .

[0008] Furthermore, the thickness 'a' of the first magnet groove and the thickness 'b' of the second magnet groove satisfy the following relationship: ; ; In the formula, D1 is the inner diameter of the stator structure, and D2 is the maximum outer diameter of the rotor structure.

[0009] Furthermore, the minimum distance c between the first magnet slot and the second magnet slot satisfies the following relationship: .

[0010] Furthermore, the eccentric arc plate has an eccentric circular arc, and the radius R1 of the eccentric circular arc satisfies the following relationship: In the formula, D2 is the maximum outer diameter of the rotor structure.

[0011] Furthermore, at least one of the magnetic leakage bridges is located at the end of the magnetic steel channel, and at least one of the magnetic leakage bridges is located at the corner of the magnetic steel channel.

[0012] A second objective of this invention is to provide a rotor structure that at least solves one of the aforementioned problems.

[0013] To achieve the above objectives, the present invention provides a rotor structure, comprising: The rotor core is formed by stacking multiple rotor laminations as described in any of the above embodiments along their normal direction, with any two adjacent rotor laminations being offset by an angle W around the rotor center O. Multiple magnetic slots are stacked to form an asymmetrical V-shaped magnetic slot; A permanent magnet, comprising a first magnet and a second magnet, wherein the first magnet and the second magnet are respectively disposed in two branches of an asymmetrical V-shaped magnet slot.

[0014] A third objective of this invention is to provide a permanent magnet motor to at least solve one of the aforementioned problems.

[0015] To achieve the above objectives, the present invention provides a permanent magnet motor, including a rotor structure as described in any of the above embodiments.

[0016] The first objective of this invention is to provide a pump that at least solves one of the aforementioned problems.

[0017] To achieve the above objectives, the present invention provides a pump comprising a permanent magnet motor as described in any of the preceding embodiments.

[0018] The beneficial effects of this invention are as follows: The rotor lamination provided by the present invention includes an eccentric arc lamination, a leakage magnetic bridge, and a lamination body. The number of leakage magnetic bridges is P, where P is a number greater than 1 of the motor pole pairs. The lamination body is provided with P cavities spaced apart circumferentially. Each cavity is provided with an eccentric arc lamination, and the cavity and the corresponding eccentric arc lamination are connected by leakage magnetic bridges. An asymmetrical V-shaped magnetic groove is formed between the eccentric arc lamination and the corresponding cavity. Each leakage magnetic bridge is located at the end or corner of the magnetic groove. Each magnet slot corresponds to one leakage magnetic bridge. Compared to the existing embedded rotor structure where one magnet slot corresponds to two leakage magnetic bridges, this reduces the number of leakage magnetic bridges, lowers the leakage magnetic flux of the rotor structure, and improves the magnetic performance of the rotor structure. While ensuring the same torque output of the permanent magnet motor, it reduces the amount of permanent magnets used, lowering the cost of using permanent magnets and the manufacturing cost of the permanent magnet motor. The magnet slots are asymmetrical V-shaped, and the leakage magnetic bridges can be located at different positions (ends or corners) of the magnet slots, making the rotor laminations a single, complete piece. This reduces the manufacturing cost of the rotor laminations while ensuring their structural strength. The rotor laminations provided by this invention, through their unique structural and shape design, can ensure both the strength of the rotor structure and reduce the leakage magnetic flux, thus finding the optimal solution between strength and reduced leakage magnetic flux, lowering the cost of using permanent magnets and the manufacturing cost of the permanent magnet motor.

[0019] The rotor structure provided by this invention includes a rotor core and a permanent magnet. The rotor core is formed by stacking multiple rotor laminations in a rotating manner along the normal direction of the rotor laminations. Any two adjacent rotor laminations are offset by an angle W along the rotor center O. Multiple magnetic slots are stacked to form an asymmetrical V-shaped magnet slot. The permanent magnet includes a first magnet and a second magnet, which are respectively located in the two bifurcations of the asymmetrical V-shaped magnet slot. The rotor core is formed by the rotation and stacking of rotor laminations, which allows the permanent magnets in different positions of the magnet slots to be distributed alternately. This also compensates for the influence of manufacturing errors of different rotor laminations on the rotor core, further improving the strength of the rotor structure. It also ensures that the leakage flux of the rotor structure is reduced, thereby reducing the cost of using permanent magnets and the manufacturing cost of permanent magnet motors.

[0020] The pump provided by this invention includes a permanent magnet motor, which includes a rotor structure. By improving the strength of the rotor structure and reducing magnetic leakage, the manufacturing cost of the permanent magnet motor and the pump is reduced. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a rotor lamination with 6 poles provided in an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram showing the disassembly of a rotor lamination with 6 poles provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a rotor lamination with 6 poles provided in an embodiment of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the rotor structure provided in this embodiment of the invention when it has 6 poles; Figure 5 This is a cross-sectional view of a portion of the rotor structure provided in this embodiment of the invention, when the rotor structure has 6 poles. Figure 6 This is a cross-sectional view of a partial structure of another rotor structure with 6 poles provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the placement of permanent magnets in a rotor structure with 6 poles provided in an embodiment of the present invention; Figure 8 This is another schematic diagram showing the placement of the permanent magnet when the rotor structure provided in this embodiment of the invention has 6 poles; Figure 9 This is a schematic diagram illustrating the unreasonable placement of permanent magnets when the rotor structure has 6 poles, as provided in this embodiment of the invention. Figure 10 This is a cross-sectional view of a portion of the rotor structure provided in this embodiment of the invention when it has 4 poles; Figure 11 This is a cross-sectional view of a portion of the rotor structure provided in an embodiment of the present invention when the rotor structure has 8 poles.

[0022] In the picture: 100, Rotor core; 101, Magnet slot; 102, Shaft hole; 200, Permanent magnet; 201, First magnet; 202, Second magnet; 300, Shaft; 1. Rotor lamination; 11. Lamination body; 111. Cavity; 12. Eccentric arc lamination; 121. Eccentric arc; 13. Leakage bridge; 14. Magnet slot; 141. First magnet slot; 142. Second magnet slot; 15. Magnetic isolation slot; 16. Through hole; O1A, line of symmetry; O1, center of eccentricity; O, center of rotor. Detailed Implementation

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings, not all of them.

[0024] This invention defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up," "down," "left," "right," "inner," and "outer," are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this invention.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] This embodiment provides a rotor lamination 1, which includes an eccentric arc plate 12, a leakage magnetic bridge 13, and a lamination body 11. The number of leakage magnetic bridges 13 is P, where P is the number of motor pole pairs greater than 1. The lamination body 11 has P cavities 111 spaced apart circumferentially. Each cavity 111 is provided with an eccentric arc plate 12, and the cavity 111 and the corresponding eccentric arc plate 12 are connected by leakage magnetic bridges 13. An asymmetrical V-shaped magnetic groove 14 is formed between the eccentric arc plate 12 and the corresponding cavity 111. Each leakage magnetic bridge 13 is located at the end or corner of the magnetic groove 14. Each magnet slot 14 corresponds to one leakage magnetic bridge 13. Compared to the existing embedded rotor structure where one magnet slot 14 corresponds to two leakage magnetic bridges 13, this reduces the number of leakage magnetic bridges 13, lowers the leakage magnetic flux of the rotor structure, and improves the magnetic performance of the rotor structure. While ensuring the same torque output of the permanent magnet motor, it reduces the amount of permanent magnet 200 used, lowering the cost of using the permanent magnet 200 and the manufacturing cost of the permanent magnet motor. The magnet slot 14 is asymmetrically V-shaped, and the leakage magnetic bridge 13 can be located at different positions (ends or corners) of the magnet slot 14, making the rotor lamination 1 a complete one-piece piece. This reduces the manufacturing cost of the rotor lamination 1 while ensuring its structural strength. The rotor lamination 1 provided by this invention, with its unique structure and shape design, can ensure both the strength of the rotor structure and reduce the leakage magnetic flux, thus finding the optimal solution between strength and reduced leakage magnetic flux, lowering the cost of using the permanent magnet 200 and the manufacturing cost of the permanent magnet motor.

[0028] The leakage magnetic bridge 13 has a negative impact on the magnetic performance of the permanent magnet motor. The more leakage magnetic bridges 13 there are, the worse the magnetic performance of the permanent magnet motor. Therefore, to improve the magnetic performance of the permanent magnet motor, the fewer leakage magnetic bridges 13 there are, the better. Since the leakage magnetic bridge 13 also serves to connect the eccentric arc plate 12 and the lamination body 11, and adjacent eccentric arc plates 12 are located in two cavities 111 of the lamination body 11, for the integrity of the rotor lamination 1, there must be at least one leakage magnetic bridge 13 between each eccentric arc plate 12 and the lamination body 11. In other words, based on manufacturing cost and structural strength considerations, the rotor lamination 1 needs to be a complete one-piece design, and the leakage magnetic bridges 13 cannot be completely eliminated; each cavity 111 must correspond to at least one leakage magnetic bridge 13. The structure of the rotor lamination 1 in this embodiment was designed based on multiple considerations of magnetic performance, manufacturing cost, and structural strength.

[0029] If the rotor lamination 1 is not a complete one-piece piece, it needs to be separated into multiple pieces for manufacturing, which makes the manufacturing process more complicated and increases the manufacturing difficulty and cost of the rotor lamination 1.

[0030] like Figures 1-3 The diagram shows a 6-pole rotor lamination 1, where P equals 3. The following description uses a 6-pole rotor lamination 1 as an example, but this does not mean that the rotor lamination 1 provided in this embodiment can only be 6-pole; it is merely used as an example for ease of explanation. In this embodiment, P is the number of motor pole pairs greater than 1, that is, P is a positive integer greater than or equal to 2.

[0031] The number of leakage magnetic bridges 13 is P. The main body of the stamping 11 is provided with P cavities 111 spaced apart along the circumference. That is to say, the cavities 111 are arranged in a one-to-one correspondence with the eccentric arc plate 12, and the eccentric arc plate 12 is arranged in a one-to-one correspondence with the leakage magnetic bridges 13.

[0032] Furthermore, the magnetic groove 14 includes a first magnetic groove 141 and a second magnetic groove 142 connected to each other. Both the first magnetic groove 141 and the second magnetic groove 142 are strip-shaped. The lengths of the first magnetic groove 141 and the second magnetic groove 142 are unequal, and the connection position of the first magnetic groove 141 and the second magnetic groove 142 forms the corner position of the magnetic groove 14. The unequal lengths of the first magnetic groove 141 and the second magnetic groove 142 result in an asymmetrical V-shape for the magnetic groove 14.

[0033] Furthermore, the leakage magnetic bridge 13 can be located at the end or corner of the magnet slot 14. The location of the leakage magnetic bridge 13 at these positions has virtually no difference in the magnetic performance of the permanent magnet motor. From the perspective of magnetic performance, the positions of the P leakage magnetic bridges 13 can be arbitrarily chosen at the end or corner of the magnet slot 14. For example, in the first case, all P leakage magnetic bridges 13 are located at the end of the magnet slot 14; in the second case, all P leakage magnetic bridges 13 are located at the corner of the magnet slot 14; or in the third case, some of the P leakage magnetic bridges 13 are located at the end of the magnet slot 14, and the rest are located at the corner of the magnet slot 14. However, considering the structural strength of the rotor lamination 1 and the rotor core 100, it is preferable that the P leakage magnetic bridges 13 are not located in the same position. That is, the third case is the preferred embodiment, as it has higher structural strength. In other words, preferably, at least one magnetic leakage bridge 13 is located at the end of the magnetic steel groove 14, and at least one magnetic leakage bridge 13 is located at the corner of the magnetic steel groove 14.

[0034] Furthermore, when the leakage magnetic bridge 13 is located at the corner of the magnetic steel channel 14, the leakage magnetic bridge 13 divides the magnetic steel channel 14 into a first magnetic steel channel 141 and a second magnetic steel channel 142 that are not continuous.

[0035] In this embodiment, the eccentric arc plate 12 has an eccentric circular arc 121, the two endpoints of the eccentric circular arc 121 are A1 and A2 respectively, the midpoint of the eccentric circular arc 121 is A, the eccentric center of the eccentric circular arc 121 is O1, and the rotor center of the rotor lamination 1 is O. The eccentric arc plate 12 refers to the fact that the eccentric center O1 of the eccentric circular arc 121 is not concentric with the rotor center O of the rotor lamination 1.

[0036] It should be noted that when the leakage magnetic bridge 13 is located at the end of the magnetic groove 14, the boundary between the two endpoints A1 and A2 of the eccentric arc 121 and the leakage magnetic bridge 13 is determined as follows: the distance from the two endpoints A1 and A2 of the eccentric arc 121 is the intersection of the straight line on the outer contour of the eccentric arc piece 12 and the eccentric arc 121. The straight line on the outer contour of the eccentric arc piece 12 refers to the normal projection of the groove surface forming the magnetic groove 14 on the outer contour of the eccentric arc piece 12.

[0037] Furthermore, the eccentric arcs 121 on each eccentric arc plate 12 have the same shape and size, and the symmetry line O1A of the eccentric arcs 121 on each eccentric arc plate 12 intersects the rotor center O of the rotor lamination 1. This arrangement ensures that each eccentric arc plate 12 is evenly distributed within the cavity of the lamination body 11.

[0038] like Figure 3As shown, the angle between the length direction of the first magnetic groove 141 and the line of symmetry O1A of its adjacent eccentric arc 121 is Q1, and the angle between the length direction of the second magnetic groove 142 and the line of symmetry O1A of its adjacent eccentric arc 121 is Q2. The included angles Q1 and Q2 satisfy the following relationship: , .

[0039] Traditional V-shaped magnetic grooves are symmetrical, forming two equal included angles Q1 and Q2, which satisfy the following relationship: In this embodiment, the included angles Q1 and Q2 in the rotor lamination 1 are not equal, and satisfy the above-mentioned design values. This ensures that the total width of the permanent magnets 200 placed in the asymmetrical V-shaped magnetic slots 14 is higher than the total width of a single permanent magnet in a traditional symmetrical V-shaped magnetic slot, and also higher than the total width of a single permanent magnet in a tangential magnetic pole structure of the prior art. The larger the width of the permanent magnet 200, the larger the area of ​​the magnetic field provided by the permanent magnet 200, and the stronger the rotor magnetic field. In other words, the rotor lamination 1 provided in this embodiment significantly improves the magnetic focusing ability of the permanent magnet 200, thereby achieving the goal of significantly reducing the total amount of permanent magnets 200 used under the same power.

[0040] In this embodiment, the length direction of the first magnet groove 141 refers to the extension direction of the first magnet groove 141. Similarly, the length direction of the second magnet groove 142 refers to the extension direction of the second magnet groove 142.

[0041] Furthermore, the thickness a of the first magnet groove 141 and the thickness b of the second magnet groove 142 satisfy the following relationship: ; ; In the formula, D1 is the inner diameter of the stator structure, and D2 is the maximum outer diameter of the rotor structure. This refers to the air gap of a permanent magnet motor.

[0042] The dimensional constraints on the thickness of the first magnet slot 141 and the second magnet slot 142 are based on the constraint relationship between the thickness of the first magnet slot 141 and the second magnet slot 142 and the air gap size of the permanent magnet motor, making the magnetic circuit of the rotor more scientific and reasonable.

[0043] In this embodiment, the thickness direction of the first magnet groove 141 is perpendicular to the length direction of the first magnet groove 141, and the thickness direction of the second magnet groove 142 is perpendicular to the length direction of the second magnet groove 142.

[0044] Furthermore, the minimum distance c between the first magnetic groove 141 and the second magnetic groove 142 satisfies the following relationship: This size limitation ensures that the gap between the first magnet groove 141 and the second magnet groove 142 is not too large, thus avoiding wasted space, and also prevents the magnetic isolation groove 15 (described below) from being placed at the corner of the magnet groove 14 due to the gap between the first magnet groove 141 and the second magnet groove 142 being too small.

[0045] The minimum distance c between the first magnet groove 141 and the second magnet groove 142 refers to the minimum distance from each point on the first magnet groove 141 to the groove surface of the second magnet groove 142.

[0046] Furthermore, the radius R1 of the eccentric circular arc 121 satisfies the following relationship: In the formula, D2 is the maximum outer diameter of the rotor structure. The distance from the midpoint A of the eccentric arc 121 to the inner diameter of the stator structure is the air gap size between the stator and rotor structures in the permanent magnet motor. The radius R1 of the eccentric arc 121 is limited, causing the two endpoints A1 and A2 of the eccentric arc 121 to bend inward toward the rotor center O of the rotor lamination 1, that is, the curvature of the eccentric arc 121 increases. This makes the distance from the two endpoints A1 and A2 of the eccentric arc 121 to the inner diameter of the stator structure greater than the air gap, which increases the magnetic reluctance of the region corresponding to the two endpoints A1 and A2 of the eccentric arc 121. As a result, the magnetic field of the region corresponding to the two endpoints A1 and A2 of the eccentric arc 121 weakens, thus making the air gap magnetic field of the permanent magnet motor more sinusoidal.

[0047] like Figures 4-6 As shown, this embodiment also provides a pump, which includes a permanent magnet motor. The permanent magnet motor includes a rotor structure, which includes a rotor core 100 and a permanent magnet 200. The rotor core 100 is formed by stacking multiple rotor laminations 1 along the normal direction of the rotor laminations 1. Any two adjacent rotor laminations 1 are offset by an angle W along the rotor center O, where W = 360° / P. Multiple magnetic slots 14 are stacked to form an asymmetrical V-shaped magnet slot 101. The permanent magnet 200 includes a first magnet 201 and a second magnet 202, which are respectively disposed in the two bifurcations of the asymmetrical V-shaped magnet slot 101. The rotor core 100 is formed by rotating and stacking the rotor laminations 1, which makes the permanent magnets 200 at different positions in the magnet slots 101 alternately distributed. This also makes up for the impact of manufacturing errors of different rotor laminations 1 on the rotor core 100, further improves the strength of the rotor structure, and also ensures that the leakage magnetic amount of the rotor structure is reduced, thereby reducing the use cost of the permanent magnets 200 and the manufacturing cost of permanent magnet motors and pumps.

[0048] The two branches of the magnet slot 101 are the first magnet slot 141 and the second magnet slot 142. The first magnet 201 and the second magnet 202 are respectively located in the two branches of the asymmetrical V-shaped magnet slot 101, that is, the first magnet 201 is located in the first magnet slot 141 and the second magnet 202 is located in the second magnet slot 142.

[0049] Furthermore, a magnetic isolation groove 15 is also provided on the rotor lamination 1, which is connected to the corner position of the magnet slot 14. The magnetic isolation groove 15 is a high magnetic resistance region, which forces most of the magnetic flux of the rotor structure to pass through the air gap into the stator structure to form an effective working magnetic flux. That is, the magnetic isolation groove 15 can prevent the main magnetic flux of the permanent magnet 200 from forming a short circuit loop inside the rotor structure.

[0050] When the leakage magnetic bridge 13 is located at the corner of the magnetic steel groove 14, the magnetic isolation groove 15 is connected to one of the branches of the magnet groove 101, and the magnetic isolation groove 15 is adjacent to the leakage magnetic bridge 13; when the leakage magnetic bridge 13 is located at the end of the magnetic steel groove 14, the magnetic isolation groove 15 is located at the corner of the magnetic steel groove 14, and the magnetic isolation groove 15 is connected to both branches of the magnetic steel groove 14.

[0051] Furthermore, the rotor structure also includes a rotating shaft 300. The rotor lamination 1 has through holes 16. After multiple rotor laminations 1 are stacked, each through hole 16 forms a shaft hole 102, and the rotating shaft 300 is disposed in the shaft hole 102.

[0052] In this embodiment, the shapes of the first magnet 201 and the second magnet 202 are not limited, as long as they can fit into the corresponding magnetic groove 14. Preferably, the first magnet 201 and the second magnet 202 are both square in shape, because square permanent magnets 200 produce less waste during processing and have higher manufacturing efficiency.

[0053] Furthermore, P positioning groups are provided on the rotor lamination 1, and the P positioning groups are evenly distributed along the circumference of the rotor lamination 1. The positioning groups facilitate the positioning between two adjacent rotor laminations 1 during stacking.

[0054] Furthermore, the rotor lamination 1 protrudes upward along the axial direction of the rotating shaft 300, so that when the rotor lamination 1 is stacked with an adjacent rotor lamination 1, protrusions and recesses are formed on the two opposing surfaces that come into contact. The protrusions and recesses serve as self-locking points for the stacking of two adjacent rotor laminations 1, facilitating positioning during stacking. Each positioning group includes multiple protrusions and recesses, and the multiple protrusions and recesses in different positioning groups can overlap when the rotor laminations 1 are rotated and stacked, facilitating positioning between two adjacent rotor laminations 1 during stacking.

[0055] Furthermore, the shapes of the protrusions and depressions can be circular, square, etc., and this embodiment does not limit them.

[0056] Figure 7 and Figure 8 The diagram shows two different distributions of the permanent magnets 200 in the magnet slots 14 of a 6-pole rotor structure. Figure 7 and Figure 8 It can be seen that the polarities of the two permanent magnets 200 within the same V-shaped magnetic groove 14 are different, meaning that the two permanent magnets 200 within the same V-shaped magnetic groove 14 are not connected in series. It should be noted that the magnetizing effect of the rotor structure under the two different distribution configurations described above is identical.

[0057] If the leakage magnetic bridge 13 is located in the first magnet slot 141 or the second magnet slot 142, the leakage magnetic bridge 13 will divide the magnet slot 141 it is located into two segments, such as Figure 9 As shown, the leakage magnetic bridge 13 is located in the first magnetic steel groove 141, which is divided into two sections by the leakage magnetic bridge 13. Therefore, two first magnets 201 need to be placed in the first magnetic steel groove 141 and one second magnet 202 needs to be placed in the second magnetic steel groove 142. The material and performance of the permanent magnet 200 may not be much different from those of the leakage magnetic bridge 13 located at the corner of the magnetic steel groove 14. However, the permanent magnet 200 needs to be set with three different sizes, which increases the manufacturing cost. Therefore, based on the dual considerations of manufacturing cost and magnetic performance, this solution is not adopted.

[0058] like Figure 10 The diagram shows a preferred embodiment where the permanent magnet 200 is embedded within the magnetic slot 14 when the rotor structure is 4-pole, i.e., P=2. Of the two leakage magnetic bridges 13, one leakage magnetic bridge 13 is located at the end of the magnetic slot 14, specifically at the end of the shorter magnetic slot 14, and the other leakage magnetic bridge 13 is located at the corner of the magnetic slot 14. Of course, other configurations are also possible when the rotor structure is 4-pole, such as both leakage magnetic bridges 13 being located at the ends of the magnetic slots 14, or both leakage magnetic bridges 13 being located at the corners of the magnetic slots 14.

[0059] like Figure 11 The diagram shows a preferred embodiment where the permanent magnet 200 is embedded within the magnet slot 14 when the rotor structure has 8 poles, i.e., P=4. Of the four leakage magnetic bridges 13, two are located at the corners of the magnet slot 14, and the other two are located at the ends of the magnet slot 14. Specifically, one leakage magnetic bridge 13 is located at the end of the shorter magnet slot 14, and the other is located at the end of the longer magnet slot 14. This arrangement improves the strength of the rotor structure, enhances the magnetization effect, and reduces the amount of permanent magnet 200 required.

[0060] To verify that the permanent magnet motor provided in this embodiment has a better magnetizing effect and uses less permanent magnet 200, simulations were performed on the permanent magnet motor provided in this embodiment and the permanent magnet motors provided in Comparative Examples 1-3. The comparison items are shown in Table 1: Table 1. Comparison of each item between this embodiment and Comparative Examples 1-3

[0061] As shown in Table 1, the permanent magnet motor provided in Comparative Example 1 has tangentially oriented magnetic poles. The permanent magnet motor provided in Comparative Example 2 has a symmetrical V-shaped distribution of magnetic poles, and the number of leakage magnetic bridges 13 is 2P, meaning that leakage magnetic bridges 13 are provided at both ends of the magnet slot 14. The permanent magnet motor provided in Comparative Example 3 has an asymmetrical V-shaped distribution of magnetic poles, and the number of leakage magnetic bridges 13 is also 2P, meaning that leakage magnetic bridges 13 are provided at both ends of the magnet slot 14. As shown in Table 1, under the premise of ensuring the same output performance of the permanent magnet motor, the material of the permanent magnet 200 in Comparative Example 1 is N38SH, and the permanent magnet 2... The total weight of permanent magnet 200 is 98.28g, and the cost of permanent magnet 200 is 34.4 yuan; in Comparative Example 2, the material of permanent magnet 200 is N38SH, the total weight of permanent magnet 200 is 88.45g, and the cost of permanent magnet 200 is 32.1 yuan; in Comparative Example 3, the material of permanent magnet 200 is N45SH, the total weight of permanent magnet 200 is 63.47g, and the cost of permanent magnet 200 is 26.3 yuan; in this embodiment, the material of permanent magnet 200 is N40SH, the total weight of permanent magnet 200 is 63.47g, and the cost of permanent magnet 200 is 24 yuan. Comparing Comparative Examples 1 and 2 with this embodiment, it can be seen that the permanent magnet 200 in the permanent magnet motor provided in this embodiment has the smallest total weight and the lowest cost. Comparing Comparative Examples 2 and 3, it can be seen that the asymmetrical V-shaped magnetic slot 14 reduces the total weight of the permanent magnet 200 and lowers its cost. Comparing Comparative Example 3 with this embodiment, it can be seen that although reducing the number of leakage bridges 13 does not reduce the total weight of the permanent magnet 200, it increases the magnetic focusing ability of the rotor structure. The permanent magnet 200 provided in this embodiment uses a lower grade material, thus lowering its cost. Therefore, the rotor lamination 1 provided in this embodiment uses an asymmetrical V-shaped magnetic slot 14, and the number of leakage bridges 13 is halved. This ensures both the strength of the rotor structure and the reduction of leakage magnetic flux, thus finding the optimal solution between strength and reduced leakage magnetic flux in the rotor structure, reducing the cost of using the permanent magnet 200 and the manufacturing cost of the permanent magnet motor.

[0062] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A rotor lamination, characterized in that, include: Eccentric arc plate (12); Leakage bridge (13), the number of which is P, where P is the number of motor pole pairs greater than 1; The stamping body (11) has P cavities (111) spaced apart along the circumference. Each cavity (111) is provided with an eccentric arc plate (12), and the cavity (111) and the corresponding eccentric arc plate (12) are connected by the leakage magnetic bridge (13). An asymmetrical V-shaped magnetic groove (14) is formed between the eccentric arc plate (12) and the corresponding cavity (111), and each of the leakage magnetic bridges (13) is located at the end or corner of the magnetic groove (14).

2. The rotor lamination according to claim 1, characterized in that, The magnetic steel groove (14) includes a first magnetic steel groove (141) and a second magnetic steel groove (142) connected to each other. Both the first magnetic steel groove (141) and the second magnetic steel groove (142) are strip-shaped. The lengths of the first magnetic steel groove (141) and the second magnetic steel groove (142) are not equal. The connection position of the first magnetic steel groove (141) and the second magnetic steel groove (142) forms the corner position of the magnetic steel groove (14).

3. The rotor lamination according to claim 2, characterized in that, The eccentric arc plate (12) has an eccentric circular arc (121). The angle between the length direction of the first magnetic groove (141) and the line of symmetry O1A of the adjacent eccentric circular arc (121) is Q1. The angle between the length direction of the second magnetic groove (142) and the line of symmetry O1A of the adjacent eccentric circular arc (121) is Q2. The angles Q1 and Q2 satisfy the following relationship: , .

4. The rotor lamination according to claim 2, characterized in that, The thickness a of the first magnetic groove (141) and the thickness b of the second magnetic groove (142) satisfy the following relationship: ； ； In the formula, D1 is the inner diameter of the stator structure, and D2 is the maximum outer diameter of the rotor structure.

5. The rotor lamination according to claim 4, characterized in that, The minimum distance c between the first magnetic groove (141) and the second magnetic groove (142) satisfies the following relationship: .

6. The rotor lamination according to claim 1, characterized in that, The eccentric arc plate (12) has an eccentric circular arc (121), and the radius R1 of the eccentric circular arc (121) satisfies the following relationship: In the formula, D2 is the maximum outer diameter of the rotor structure.

7. The rotor lamination according to claim 1, characterized in that, At least one of the magnetic leakage bridges (13) is located at the end of the magnetic steel groove (14), and at least one of the magnetic leakage bridges (13) is located at the corner of the magnetic steel groove (14).

8. A rotor structure, characterized in that, include: The rotor core (100) is formed by stacking multiple rotor laminations (1) as described in any one of claims 1-7 along their normal direction, with any two adjacent rotor laminations (1) being offset by an angle W along the rotor center O, where W = 360° / P, and multiple magnet slots (14) being stacked to form an asymmetrical V-shaped magnet slot (101). The permanent magnet (200) includes a first magnet (201) and a second magnet (202), which are respectively disposed in two branches of an asymmetrical V-shaped magnet slot (101).

9. A permanent magnet motor, characterized in that, Includes the rotor structure as described in claim 8.

10. A pump, characterized in that, Including the permanent magnet motor as described in claim 9.

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