Rotor punching sheet and permanent magnet motor thereof

Abstract

The utility model discloses a rotor punching sheet and a permanent magnet motor thereof, the rotor punching sheet comprises a sheet body and even number of synthetic magnetic poles, and the even number of synthetic magnetic poles are distributed on the sheet body along the circumferential direction; an arc corresponding to the outline of the outer circle of each combined magnetic pole and the shaft hole of the sheet body are eccentric, and a first notch and a second notch which are concave inwards are formed in the two ends of the arc respectively and are symmetrical about the midpoint of the arc. According to the utility model, the arcs of the outer circle outlines of the combined magnetic poles are eccentric to the shaft hole of the rotor, and each arc is provided with the first notches and the second notches which are symmetrically distributed, so that uneven air gap distribution which is in a specific shape and is in a certain regular size is formed, which is equivalent to that very ingenious pole cutting treatment is carried out on the rotor; the sine degree of air gap flux density can be optimized, the effects of weakening harmonic waves of all orders and reducing cogging torque are achieved, and vibration and electromagnetic noise are reduced while the efficiency of the motor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to permanent magnet motor technical field especially relates to a rotor lamination and its permanent magnet motor. BACKGROUND

[0002] The continuous progress of battery technology, drive technology and intelligent technology brings new development opportunities for electric motorcycles and electric four-wheel vehicles industry. At present, the market shows very strong growth momentum. At the same time, new technology and new process make lightweight design and high performance possible, and high performance motor and drive system can provide faster acceleration and more stable driving experience.

[0003] Electric motorcycles and electric vehicles become the best choice for consumers to travel short distances due to their environmental protection, low carbon and convenience, and also show broad application prospects in the field of shared travel. In order to save cost and facilitate design and manufacture, the motor for electric motorcycles and electric four-wheel vehicles at the present stage often adopts the concentrated winding motor scheme with 12-slot 10-pole built-in "straight type" or "V-shaped" magnetic pole magnetic steel distribution, and the produced motor has the advantages of small cogging torque and low manufacturing cost. However, its disadvantages are also very obvious, among which the demagnetization risk at high speed and the high intensity vibration noise excited by electromagnetic force wave are urgent technical problems to be solved. SUMMARY

[0004] The embodiment of the utility model provides a kind of rotor lamination and its permanent magnet motor, solve the technical problem of vibration noise that exists in traditional permanent magnet motor.

[0005] In order to solve the above problems, according to one aspect of the present application, the embodiment of the utility model provides a kind of rotor lamination, the rotor lamination includes sheet body and synthetic magnetic pole, the synthetic magnetic pole has even number, even number The synthetic magnetic pole is distributed on the sheet body along the circumference;Each synthetic magnetic pole outer circle profile corresponding arc is eccentric with the shaft hole of the sheet body, and the two ends of the arc are provided with the first notch and the second notch recessed inward respectively, and the first notch and the second notch are symmetrical about the midpoint of the arc.

[0006] In some embodiments, the synthetic magnetic pole includes a first magnet slot, a second magnet slot and a third magnet slot, the first magnet slot and the second magnet slot are arranged in different directions, the first end of the first magnet slot and the second magnet slot has a first distance, the second end of the first magnet slot and the second magnet slot has a second distance, the first distance is greater than the second distance, and the first end of the first magnet slot and the second magnet slot is towards the edge of the sheet body, the third magnet slot is arranged between the first end of the first magnet slot and the second magnet slot.

[0007] In some embodiments, the synthetic magnetic pole further comprises a first permanent magnet, a second permanent magnet and a third permanent magnet, the first permanent magnet is arranged in the first magnet slot, the second permanent magnet is arranged in the second magnet slot, and the third permanent magnet is arranged in the third magnet slot; the first magnet slot, the second magnet slot and the third magnet slot are each provided with a limiting boss;

[0008] And / or the width a1 of the third magnet slot and the width a2 of the first magnet slot and the second magnet slot satisfy: a1=k a ×a2, k a =0.5-1.

[0009] In some embodiments, the first magnet slot and the edge of the sheet form a first magnetic isolation bridge, and the distance between the side of the first magnet slot close to the edge of the sheet and the edge of the sheet is 0.5-1.5 mm; the second magnet slot and the edge of the sheet form a second magnetic isolation bridge, and the distance between the side of the second magnet slot close to the edge of the sheet and the edge of the sheet is 0.5-1.5 mm; the first magnet slot and the second magnet slot form a third magnetic isolation bridge, and the distance between the end of the first magnet slot away from the edge of the sheet and the end of the second magnet slot away from the edge of the sheet is 0.5-3 mm; and / or the upper end of the third magnetic isolation bridge is in a right angle shape.

[0010] In some embodiments, the bottom of the first magnet slot on both sides is respectively provided with a first semicircular groove and a second semicircular groove, wherein the first semicircular groove is close to the edge of the sheet; the bottom of the second magnet slot on both sides is respectively provided with a third semicircular groove and a fourth semicircular groove, wherein the third semicircular groove is close to the edge of the sheet; the bottom of the third magnet slot on both sides is respectively provided with a fifth semicircular groove and a sixth semicircular groove; the radius of the fifth semicircular groove and the sixth semicircular groove is 0.15-1 mm, the radius of the first semicircular groove and the third semicircular groove is 0.2-1.5 mm, and the radius of the second semicircular groove and the fourth semicircular groove is 0.15-1 mm.

[0011] In some embodiments, the upper side of the third magnet slot is provided with a first inclined gap and a second inclined gap symmetrically distributed on both sides, and the distance x1 between the ends of the first inclined gap and the second inclined gap close to each other satisfies: x1=k x ×b1, wherein k x =0.5-0.9, b1 is the distance between the fifth semicircular groove and the sixth semicircular groove, and the included angle j1 between the first inclined gap and the second inclined gap and the horizontal plane satisfies: j1=0.3-30°.

[0012] The third inclined side gap away from the upper end of the side of the sheet has a length x2 on the projection on the reference surface, and x2=k x b2, wherein k x =0.1-0.3, b2 is the distance between the first semicircular groove and the second semicircular groove, and b1 and b2 satisfy b1=k b b2, k b =0.5-1; the included angle j2 between the third inclined side gap and the reference surface satisfies j2=0.3-30°, wherein the reference surface is the inclined surface of the second permanent magnet;

[0013] The fourth inclined side gap away from the upper end of the side of the sheet has the same length and inclination angle as the third inclined side gap.

[0014] In some embodiments, the eccentricity d of the circular arc corresponding to the outer circular profile of the synthetic magnetic pole and the shaft hole of the sheet satisfies d=k d r0, wherein k d =0.15-0.55; the radius r1 of the circular arc corresponding to the outer circular profile of the synthetic magnetic pole and the diameter r0 of the sheet satisfy r1=k r r0, k r =0.5-0.9.

[0015] In some embodiments, the first gap and the second gap are uniform circular arcs, and the radius r2 corresponding to the circular arcs satisfies r2=k r r1, k r =0.02-0.4; and the first gap and the second gap are connected to the outer circular profile of the synthetic magnetic pole through a transition circular arc.

[0016] In some embodiments, the sheet has rivet holes, ventilation holes, sheet sorting grooves, and screw through holes, the rivet holes and the screw through holes are at least two and are arranged in a whole circle by crossing each other, the ventilation holes are multiple and are uniformly distributed on the sheet in the circumferential direction, and the sheet sorting grooves are connected to the rotor shaft hole.

[0017] According to another aspect of the present application, an embodiment of the present application provides a permanent magnet motor, which comprises the rotor punching sheet.

[0018] Compared with the prior art, the rotor punching sheet has at least the following beneficial effects:

[0019] The rotor punching sheet provided by the utility model discloses a sheet body and synthetic magnetic poles, the synthetic magnetic poles are even in number, the even synthetic magnetic poles are distributed on the sheet body in the circumferential direction, the arc corresponding to the outer circle profile of each synthetic magnetic pole is eccentric to the shaft hole of the sheet body, and the two ends of the arc are respectively provided with a first notch and a second notch which are recessed inward, and the first notch and the second notch are symmetrical about the midpoint of the arc.

[0020] The arc of the outer circle profile of each synthetic magnetic pole is eccentric to the rotor shaft hole, the first notch and the second notch are symmetrically distributed on each arc, an uneven air gap distribution of a specific shape and a certain regularity and size is formed, which is equivalent to very ingenious pole reduction processing of the rotor, can optimize the sine degree of air gap magnetic density, plays a role in weakening each order harmonic and reducing the tooth slot torque, and makes the motor efficiency be improved while reducing vibration and electromagnetic noise.

[0021] The permanent magnet motor provided by the utility model is designed based on the above-mentioned rotor punching sheet, and the beneficial effects thereof are the same as those of the above-mentioned rotor punching sheet, which will not be repeated here.

[0022] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and the content of the specification can be implemented, the following will be described in detail with the preferred embodiments of the utility model and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the drawings needed in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 It is a structure schematic view of a rotor punching sheet provided by the embodiment of the utility model;

[0025] Figure 2 It is a first structure schematic view of a single rotor magnetic pole in a rotor punching sheet provided by the embodiment of the utility model;

[0026] Figure 3 It is a second structure schematic view of a single rotor magnetic pole in a rotor punching sheet provided by the embodiment of the utility model;

[0027] Figure 4 It is Figure 3 The local enlarged view of A in the above-mentioned structure schematic view of the rotor punching sheet;

[0028] Figure 5is a third structure schematic view of a single rotor magnetic pole in a rotor punching sheet and provided by the embodiment of the utility model;

[0029] Figure 6 is a fourth structure schematic view of a single rotor magnetic pole in a rotor punching sheet and provided by the embodiment of the utility model;

[0030] Figure 7 is a fifth structure schematic view of a single rotor magnetic pole in a rotor punching sheet and provided by the embodiment of the utility model;

[0031] Figure 8 is a structure schematic view that a third permanent magnet cooperates with a third magnet slot in a rotor punching sheet and provided by the embodiment of the utility model;

[0032] Figure 9 is a sixth structure schematic view of a single rotor magnetic pole in a rotor punching sheet and provided by the embodiment of the utility model;

[0033] Figure 10 is a structure schematic view that a first permanent magnet cooperates with a first magnet slot in a rotor punching sheet and provided by the embodiment of the utility model;

[0034] Figure 11 is a seventh structure schematic view of a single rotor magnetic pole in a rotor punching sheet and provided by the embodiment of the utility model;

[0035] Figure 12 is another structure schematic view of a rotor punching sheet and provided by the embodiment of the utility model;

[0036] Reference signs:

[0037] 1, sheet body;11, rivet hole;12, ventilation hole;13, sheet sorting groove;14, screw through hole;2, synthetic magnetic pole;21, first permanent magnet;22, second permanent magnet;23, third permanent magnet;24, first magnet slot;25, second magnet slot;26, third magnet slot;27, first magnetic separation bridge;28, second magnetic separation bridge;29, third magnetic separation bridge;241, first semicircular slot;242, second semicircular slot;243, third inclined side gap;244, first limiting boss;251, third semicircular slot;252, fourth semicircular slot;253, second limiting boss;261, fifth semicircular slot;262, sixth semicircular slot;263, first inclined side gap;264, second inclined side gap;265, third limiting boss;3, arc;31, first notch;32, second notch. Specific implementation

[0038] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0039] In the description of this utility model, it should be clarified that the terms "first," "second," etc., in the specification, claims, and drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; the terms "vertical," "lateral," "longitudinal," "front," "back," "left," "right," "up," "down," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model, and do not mean that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this utility model.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0042] Example 1

[0043] This embodiment provides a rotor lamination, such as Figures 1-12 As shown, the rotor lamination includes a lamination body 1 and composite magnetic poles 2. There are an even number of composite magnetic poles 2, which are distributed circumferentially on the lamination body 1. The arc 3 corresponding to the outer circle contour of each composite magnetic pole 2 is eccentric to the shaft hole of the lamination body 1, and the two ends of the arc 3 have an inwardly recessed first notch 31 and a second notch 32, respectively. The first notch 31 and the second notch 32 are symmetrical about the midpoint of the arc 3.

[0044] Specifically, the sheet 1 has a circular structure with a central axial hole. On the surface of this circular structure, there is an even number of circumferentially distributed composite magnetic poles 2. Figure 1The number of the synthetic magnetic poles 2 is eight, but can also be six or ten, etc. The outer contour of the synthetic magnetic pole 2 forms a circular arc 3, which is eccentric to the shaft hole of the sheet body 1, i.e. the centers of the corresponding circles do not coincide. Furthermore, at both ends of the circular arc 3, there are a first notch 31 and a second notch 32 respectively, which are symmetrical about the midpoint of the circular arc 3.

[0045] The outer contour of each synthetic magnetic pole 2 in the embodiment is a circular arc 3 which is eccentric to the rotor shaft hole, as shown in the figure. There are symmetrical first notches 31 and second notches 32 on each circular arc 3, forming a specific shape and a non-uniform air gap distribution with certain regular size. This is equivalent to a very clever pole cutting treatment for the rotor, which can optimize the sine degree of the air gap flux density, weaken the harmonic of each order and reduce the cogging torque, so as to improve the efficiency of the motor while reducing vibration and electromagnetic noise. Figure 4

[0046] More specifically, the pole cutting treatment can optimize the shape of the permanent magnet, making it closer to the sine wave form, thereby reducing the high harmonic content in the air gap flux density; it can effectively reduce the total harmonic distortion rate of the air gap magnetic field, thereby reducing the vibration, noise and iron loss of the motor, and improving the overall performance of the motor; the pole cutting treatment can also reduce the cogging torque and torque ripple by optimizing the shape of the magnetic pole; through the pole cutting treatment, the waveform of the air gap magnetic field can also be designed to be closer to the ideal sine waveform. In summary, the pole cutting treatment optimizes the shape and thickness of the permanent magnet, reduces the harmonic content in the air gap magnetic field, thereby significantly improves the sine degree of the air gap flux density, improves the performance of the motor and reduces vibration and noise.

[0047] In a specific embodiment, the synthetic magnetic pole 2 includes a first magnet slot 24, a second magnet slot 25 and a third magnet slot 26, the first magnet slot 24 and the second magnet slot 25 are arranged in different directions, the first end of the first magnet slot 24 and the second magnet slot 25 has a first distance, the second end of the first magnet slot 24 and the second magnet slot 25 has a second distance, the first distance is greater than the second distance, and the first end of the first magnet slot 24 and the second magnet slot 25 is towards the edge of the sheet body 1, the third magnet slot 26 is arranged between the first end of the first magnet slot 24 and the second magnet slot 25.

[0048] ​More specifically, the first magnet slot 24 and the second magnet slot 25 are inclined in different directions to form a V-shaped structure. Unlike the V-shape, the second ends of the first magnet slot 24 and the second magnet slot 25 do not contact each other, and there is a second distance between them. The first ends of the first magnet slot 24 and the first ends of the second magnet slot 25 face the edge of the sheet 1, and there is a first distance between them. The first distance is greater than the second distance. The third magnet slot 26 is disposed between the first ends of the first magnet slot 24 and the second magnet slot 25, that is, in the space with a larger distance.

[0049] In a specific embodiment, the composite magnetic pole 2 further includes a first permanent magnet 21, a second permanent magnet 22, and a third permanent magnet 23. The first permanent magnet 21 is disposed in the first magnet slot 24, the second permanent magnet 22 is disposed in the second magnet slot 25, and the third permanent magnet 23 is disposed in the third magnet slot 26.

[0050] Due to the positional relationship of the first magnet slot 24, the second magnet slot 25, and the third magnet slot 26, the first permanent magnet 21, the second permanent magnet 22, and the third permanent magnet 23 also have similar structural shapes. This shape makes the excitation of the permanent magnets more concentrated, thereby reducing magnetic leakage and improving the magnetic reluctance and efficiency of the motor.

[0051] In addition, the first magnet slot 24, the second magnet slot 25, and the third magnet slot 26 all have limiting bosses. Specifically, the first magnet slot 24 has a first limiting boss 244, the second magnet slot 25 has a second limiting boss 253, and the third magnet slot 26 has a third limiting boss 265. These limiting bosses, through contact with the permanent magnets, limit the force applied to the permanent magnets, preventing them from being thrown out during the rotation of the rotor core. This design effectively avoids the problem of magnet detachment caused by centrifugal force or other external forces. Furthermore, the design of the limiting bosses can optimize the motor's magnetic circuit, reduce magnetic leakage, and thus improve the motor's efficiency.

[0052] like Figure 6 As shown, the width a1 of the third magnet slot 26 and the width a2 of the first magnet slot 24 and the second magnet slot 25 satisfy the following relationship: a1 = k a ×a2,k a =0.5~1. First, the width of the magnet slot directly affects the magnitude of the cogging torque. Appropriately limiting the width of the magnet slot can effectively reduce the cogging torque, thereby improving the smoothness and efficiency of the motor's operation. Second, the width of the magnet slot affects the distribution of the air gap magnetic field. By reasonably limiting the slot width, higher harmonics in the air gap magnetic field can be reduced, thereby reducing torque ripple and improving the electromagnetic performance of the motor.

[0053] In specific embodiments, a first magnetic bridge 27 is formed between the first magnet slot 24 and the edge of the sheet 1, and between the second magnet slot 25 and the edge of the sheet 1, the distance between the side of the first magnet slot 24 close to the edge of the sheet 1 and the edge of the sheet 1 is 0.5mm-1.5mm; a second magnetic bridge 28 is formed between the third magnet slot 26 and the edge of the sheet 1, the distance between the side of the second magnet slot 25 close to the edge of the sheet 1 and the edge of the sheet 1 is 0.5mm-1.5mm; a third magnetic bridge 29 is formed between the first magnet slot 24 and the second magnet slot 25 away from the edge of the sheet 1, the distance between the end of the first magnet slot 24 away from the edge of the sheet 1 and the end of the second magnet slot 25 away from the edge of the sheet 1 is 0.5mm-3mm.

[0054] The above-mentioned distances correspond to the thicknesses of the first magnetic bridge 27, the second magnetic bridge 28 and the third magnetic bridge 29 respectively. First, appropriate magnetic bridge thickness can enhance the mechanical strength of the rotor, prevent material yield or fracture due to centrifugal force when rotating at high speed; second, by reasonably designing the thickness of the magnetic bridge, the magnetic flux leakage can be reduced while maintaining sufficient mechanical strength, so as to balance the electromagnetic performance and mechanical strength; and third, by optimizing the design of the magnetic bridge, the iron loss and electromagnetic force of the motor can be reduced, thereby improving the motor efficiency and Nvh performance.

[0055] The upper end of the third magnetic bridge 29 is in a right angle shape. The right angle shaped magnetic bridge can effectively limit the leakage flux, thereby improving the efficiency and performance of the motor. It can also enhance the overall mechanical strength of the rotor lamination, prevent deformation when running at high speed or under the action of centrifugal force. Moreover, the third magnetic bridge 29 makes the magnetic bridge longer through two horizontal line segments, so that the anti-leakage effect is improved. Thus, the torque ripple of the motor is reduced.

[0056] In specific embodiments, the bottom of the first magnet slot 24 on both sides has a first semicircular groove 241 and a second semicircular groove 242, wherein the first semicircular groove 241 is close to the edge of the sheet 1; the bottom of the second magnet slot 25 on both sides has a third semicircular groove 251 and a fourth semicircular groove 252, wherein the third semicircular groove 251 is close to the edge of the sheet 1; the bottom of the third magnet slot 26 on both sides has a fifth semicircular groove 261 and a sixth semicircular groove 262; the radius of the fifth semicircular groove 261 and the sixth semicircular groove 262 is 0.15mm-1mm, the radius of the first semicircular groove 241 and the third semicircular groove 251 is 0.2mm-1.5mm, and the radius of the second semicircular groove 242 and the fourth semicircular groove 252 is 0.15mm-1mm. Moreover, the radius of the second semicircular groove 242 is smaller than the radius of the first semicircular groove 241, and the radius of the fourth semicircular groove 252 is smaller than the radius of the third semicircular groove 251.

[0057] More specifically, the first magnet slot 24 and the second magnet slot 25 have the same structure, the main profile of the first magnet slot 24 is quadrilateral, two long sides are the first side and the second side respectively, two short sides are the third side and the fourth side respectively, wherein the second side is the side away from the third magnet slot 26, and the first semicircular groove 241 and the second semicircular groove 242 are extended in the direction away from the third magnet slot 26 at the two ends of the second side. The third side is the side close to the edge of the sheet body 1, and the upper limiting step is extended in the direction close to the edge of the sheet body 1, and the fourth side is extended in the direction away from the edge of the sheet body 1, and the upper limiting boss and the lower limiting boss are the first limiting boss 244 mentioned above.

[0058] The general profile of the third magnet slot 26 is also quadrilateral, two long sides are the fifth side and the sixth side respectively, and two short sides are the seventh side and the eighth side respectively, wherein the fifth side is the side close to the edge of the sheet body 1, and the sixth side is extended in the direction close to the center to form the fifth semicircular groove 261 and the sixth semicircular groove 262. The seventh side and the eighth side are respectively extended to the left and right to form the left limiting boss and the right limiting boss, which are the third limiting boss 265 mentioned above.

[0059] As shown in Figure 9 and Figure 10 , the upper end of the side of the first magnet slot 24 away from the sheet body 1 has a third inclined gap 243, the projection of the third inclined gap 243 on the reference surface has a length x2, which satisfies: x2=k x ’×b2, wherein k x ’=0.1~0.3, b2 is the distance between the first semicircular groove 241 and the second semicircular groove 242, and b1 and b2 satisfy: b1=k b ×b2, k b =0.5~1; the angle j2 between the third inclined gap 243 and the reference surface satisfies: j2=0.3~30°, wherein the reference surface is the inclined surface of the second permanent magnet 22;

[0060] In order to explain more clearly, the first side, the second side, the third side and the fourth side mentioned above are continued to be used. At the end of the first side away from the edge of the sheet body 1, the end of the first side is inclined outward, so that the side and the first permanent magnet 21 form the third inclined gap 243.

[0061] The upper end of the side of the second magnet slot 25 away from the sheet body 1 has a fourth inclined gap, which has the same length and inclination angle as the third inclined gap 243.

[0062] In specific embodiments, as shown in Figure 7 and Figure 8As shown, the two sides of the upper side of the third magnet slot 26 have symmetrically distributed first inclined side gap 263 and second inclined side gap 264, the distance x1 between the ends of the first inclined side gap 263 and the second inclined side gap 264 satisfies: x1=k x ×b1, wherein, k x =0.5~0.9, b1 is the distance between the fifth semicircular slot 261 and the sixth semicircular slot 262, the included angle j1 between the first inclined side gap 263 and the second inclined side gap 264 and the horizontal plane satisfies: j1=0.3~30°.

[0063] In order to explain more clearly, continue to use the fifth side, the sixth side, the seventh side and the eighth side described above, the two sides of the fifth side are inclined to the edge of the sheet body 1 respectively, so that the side and the third permanent magnet 23 form the first inclined side gap 263 and the second inclined side gap 264.

[0064] The magnet slot on the rotor lamination is provided with a semicircular slot and an inclined side gap, so that the local magnetic permeance of these parts changes, thereby changing the magnetic field distribution form of the permanent magnet. This is beneficial to weaken the harmonic components of a certain order. In addition, the local demagnetization of the permanent magnet often occurs at the four corner parts, and the most effective method for the permanent magnet to resist demagnetization is to increase the thickness, but this will obviously increase the cost. The design of the permanent magnet slot in the embodiment can effectively enhance the magnetic resistance of the part, so that the demagnetization magnetic potential is offset, and the anti-demagnetization ability of the permanent magnet is improved, thereby achieving the purpose of saving the amount of magnetic steel, and reducing the manufacturing material cost of the motor.

[0065] In specific embodiments, the eccentricity d of the circular arc 3 corresponding to the outer circular contour of each of the synthetic magnetic poles 2 and the shaft hole of the sheet body 1 satisfies: d=k d ×r0, wherein, k d =0.15~0.55; the radius r1 of the circular arc 3 corresponding to the outer circular contour of the synthetic magnetic pole 2 and the diameter r0 of the sheet body 1 satisfy: r1=k r ×r0, k r =0.5~0.9. By adjusting the eccentricity, the distribution of the air gap magnetic field can be changed, thereby reducing the air gap magnetic flux harmonic, making the radial air gap magnetic flux density waveform closer to the sine waveform, and further improving the electromagnetic performance of the motor. Moreover, the design of the eccentricity can effectively reduce the cogging torque and torque fluctuation, thereby improving the stability and reliability of the motor operation.

[0066] In specific embodiments, the first gap 31 and the second gap 32 are uniform circular arcs, and the corresponding radius r2 satisfies: r2=k r ’×r1, k rThe first gap 31 and the second gap 32 are connected to the outer circular contour of the synthetic magnetic pole 2 by a transition arc.

[0067] In addition, the first gap 31 and the second gap 32 are also rounded at the intersection with the magnetic pole outer contour arc.

[0068] In specific embodiments, the sheet body 1 has rivet holes 11, ventilation holes 12, sheet sorting grooves 13, and screw through holes 14. The rivet holes 11 and the screw through holes 14 are both at least two and are arranged in a whole circle. The ventilation holes 12 are multiple and uniformly distributed on the sheet body 1. The sheet sorting grooves 13 are connected to the rotor shaft hole.

[0069] The rivet holes 11 can rivet multiple rotor laminations into a rotor core, which is applied to a permanent magnet motor. The shape of the ventilation holes 12 can be circular, elongated, U-shaped, or other irregular patterns. These holes are usually uniformly distributed in the circumferential direction to ensure the symmetry and efficiency of air flow. The main function of the ventilation holes 12 is to reduce the temperature rise of the key parts of the motor through forced cooling, thereby improving the heat dissipation effect and operating efficiency of the motor. The sheet sorting grooves 13 can serve as reference points for positioning the lamination units, ensuring that the laminations maintain the correct orientation and position during stacking. The sheet sorting grooves 13 can also play an important role in the subsequent motor assembly process. In the automatic sheet sorting device, the design of the sheet sorting grooves 13 helps to arrange the stacked rotor laminations, reduces the labor intensity of manual operation, and prevents the laminations from being damaged or generating noise during the falling process. The sheet sorting grooves 13 in this embodiment are semicircular, but they can also be other shapes. The screw through holes 14 are used for the installation of the rotor end plate.

[0070] In addition, the shaft hole of the rotor is provided with a keyway. The main function of the keyway on the shaft hole of the rotor is to install the key to achieve the circumferential fixation and torque transmission between the rotor core and the rotor shaft. The design of the keyway and the cooperation of the key can ensure that the rotor does not slide relatively during rotation, thereby ensuring the stability and reliability of the mechanical system.

[0071] In addition, in order to make the rotor lamination provided by the embodiment can be applied to the inclined pole of the two-section rotor, the above-mentioned rivet holes 11, ventilation holes 12, sheet sorting grooves 13, and screw through holes 14 can be rotated by a specific inclined pole angle, as shown in the following figure. Figure 12

[0072] The rotor lamination provided by the embodiment can effectively form an air gap magnetic field with high magnetic density and high sine degree, has the advantages of high power density, low electromagnetic vibration noise, small tooth slot torque, etc.

[0073] Embodiment 2

[0074] ​The embodiment provides a permanent magnet motor, which comprises the rotor lamination of the embodiment 1.

[0075] The above merely provides a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A rotor lamination, characterized by The rotor lamination comprises a lamination body and synthetic magnetic poles, the synthetic magnetic poles are even in number and are distributed on the lamination body in a circumferential direction; the outer circular profile of each synthetic magnetic pole corresponds to a circular arc which is eccentric to the shaft hole of the lamination body, and the two ends of the circular arc are respectively provided with a first notch and a second notch which are symmetric about the midpoint of the circular arc.

2. The rotor lamination of claim 1, wherein The synthetic magnetic pole comprises a first magnet slot, a second magnet slot and a third magnet slot, the first magnet slot and the second magnet slot are arranged in different directions, the first magnet slot and the second magnet slot have a first distance between the first ends thereof, the first magnet slot and the second magnet slot have a second distance between the second ends thereof, the first distance is greater than the second distance, and the first ends of the first magnet slot and the second magnet slot are directed towards the edge of the lamination body, the third magnet slot is arranged between the first ends of the first magnet slot and the second magnet slot.

3. The rotor lamination of claim 2, wherein, The synthetic magnetic pole further comprises a first permanent magnet, a second permanent magnet and a third permanent magnet, the first permanent magnet is arranged in the first magnet slot, the second permanent magnet is arranged in the second magnet slot, and the third permanent magnet is arranged in the third magnet slot; the first magnet slot, the second magnet slot and the third magnet slot are all provided with a limiting boss. and / or the width a1 of the third magnet slot and the width a2 of the first and second magnet slots satisfy: a1 = k a x a2, k a = 0.5-1.

4. The rotor lamination of claim 3, wherein, The first magnet slot and the second magnet slot are both provided with a first magnetic separation bridge between the edge of the lamination body and the side of the lamination body close to the edge, the distance between the side of the lamination body close to the edge and the edge of the lamination body is 0.5mm-1.5mm; the third magnet slot is provided with a second magnetic separation bridge between the edge of the lamination body and the side of the lamination body close to the edge, the distance between the side of the lamination body close to the edge and the edge of the lamination body is 0.5mm-1.5mm; the first magnet slot and the second magnet slot are provided with a third magnetic separation bridge between the ends thereof away from the edge of the lamination body, the distance between the ends of the first magnet slot and the second magnet slot away from the edge of the lamination body is 0.5mm-3mm; and / or the upper end of the third magnetic separation bridge is in a right angle shape.

5. The rotor lamination of claim 3, wherein, The bottoms of the two sides of the first magnet slot are respectively provided with a first semicircular groove and a second semicircular groove, wherein the first semicircular groove is close to the edge of the lamination body; the bottoms of the two sides of the second magnet slot are respectively provided with a third semicircular groove and a fourth semicircular groove, wherein the third semicircular groove is close to the edge of the lamination body; the bottoms of the two sides of the third magnet slot are respectively provided with a fifth semicircular groove and a sixth semicircular groove; the radii of the fifth semicircular groove and the sixth semicircular groove are 0.15mm-1mm, the radii of the first semicircular groove and the third semicircular groove are 0.2mm-1.5mm, and the radii of the second semicircular groove and the fourth semicircular groove are 0.15mm-1mm.

6. The rotor lamination of claim 5, wherein, The two sides of the third magnet slot upper side have symmetrically distributed first and second inclined side gaps, and the distance x1 between the ends of the first and second inclined side gaps close to each other satisfies: x1=k x ×b1, wherein, k x =0.5-0.9, b1 is the distance between the fifth semicircular groove and the sixth semicircular groove, and the included angle j1 between the first and second inclined side gaps and the horizontal plane satisfies: j1=0.3-30°. The third inclined side gap has a length x2 of a projection on a reference surface, and x2=k x b2, where k x '=0.1-0.3, b2 is a distance between the first semicircular groove and the second semicircular groove, and b1 and b2 satisfy b1=k b b2, k b =0.5-1; an included angle j2 between the third inclined side gap and the reference surface satisfies j2=0.3-30°, where the reference surface is an inclined surface of the second permanent magnet; The upper end of the side of the second magnet slot away from the lamination body is provided with a fourth inclined gap, and the length and the inclination angle of the fourth inclined gap are the same as those of the third inclined gap.

7. The rotor lamination of any of claims 4-6, wherein, The eccentricity d of the circular arc corresponding to the outer circular contour of each synthetic magnetic pole to the shaft hole of the sheet body satisfies: d=k d ×r0, wherein k d =0.15-0.55; the radius r1 of the circular arc corresponding to the outer circular contour of each synthetic magnetic pole to the diameter r0 of the sheet body satisfies: r1=k r ×r0, k r =0.5-0.

9.

8. The rotor lamination of claim 7, wherein, The first gap and the second gap are uniform circular arcs, and a corresponding radius r2 satisfies: r2=k r ’×r1, k r ’=0.02-0.4; and the first gap and the second gap are connected with the synthetic magnetic pole outer circle profile through a transition circular arc.

9. The rotor lamination of any of claims 1-6, wherein, The sheet body is provided with rivet holes, ventilation holes, sheet arranging grooves and screw holes, the rivet holes and the screw holes are at least two and are arranged in a whole circle, the ventilation holes are multiple and are uniformly distributed on the sheet body in the circumferential direction, and the sheet arranging grooves are connected with the rotor shaft hole.

10. A permanent magnet electric machine characterized by, The permanent magnet motor comprises the rotor sheet as claimed in any one of claims 1-9.

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