CN112821608B - Rotor punching sheet, rotor core, motor rotor, assembling method and motor - Google Patents
Rotor punching sheet, rotor core, motor rotor, assembling method and motor Download PDFInfo
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- CN112821608B CN112821608B CN202110088064.1A CN202110088064A CN112821608B CN 112821608 B CN112821608 B CN 112821608B CN 202110088064 A CN202110088064 A CN 202110088064A CN 112821608 B CN112821608 B CN 112821608B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/028—Means for mechanical adjustment of the excitation flux by modifying the magnetic circuit within the field or the armature, e.g. by using shunts, by adjusting the magnets position, by vectorial combination of field or armature sections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a rotor punching sheet, a rotor core, a motor rotor, an assembling method and a motor, wherein the rotor punching sheet comprises a punching sheet body, a plurality of magnetic pole forming areas corresponding to magnetic poles of the motor rotor are arranged on the punching sheet body in each magnetic pole forming area, a first magnetic barrier groove is formed in the punching sheet body in each magnetic pole forming area, the first magnetic barrier grooves are symmetrical about a d axis in the corresponding magnetic pole forming area and form a first tensile angle structure facing the outer peripheral side of the punching sheet body, a first magnetic isolation bridge on the d axis is arranged at the bottom of each first magnetic barrier groove, each first magnetic barrier groove comprises two first laterally extending magnetic barrier grooves symmetrical about the d axis, each first laterally extending magnetic barrier groove comprises a first magnetic steel groove and a first air groove located on the radial outer side of the first magnetic steel groove, and the first air grooves are communicated with the outer peripheral wall of the punching sheet body. According to the invention, the outer circle of the rotor sheet is not provided with the magnetic isolation bridge, so that the magnetic leakage at the magnetic isolation bridge can be reduced, the salient pole ratio of the rotor is improved, and the torque output capacity of the motor is enhanced.
Description
Technical Field
The invention belongs to the technical field of motor manufacturing, and particularly relates to a rotor punching sheet, a rotor iron core, a motor rotor, an assembling method and a motor.
Background
At present, an asynchronous motor system is mostly adopted in the field of electric transmission, and compared with the asynchronous motor system, a permanent magnet motor system has the characteristics of low loss and high efficiency and is the development trend of the next generation of transmission systems. Because the back electromotive force of the common permanent magnet synchronous motor is high, and the danger of damaging an inverter exists in high-speed operation, the permanent magnet auxiliary synchronous reluctance motor is favored. The synchronous reluctance motor has high reliability, does not have the risk of magnetic loss because the rotor of the synchronous reluctance motor is not provided with a permanent magnet, but has low power factor which is a main defect of the synchronous reluctance motor and has higher requirements on the capacity and the control performance of an inverter of a motor controller.
The permanent magnet auxiliary synchronous reluctance motor has the characteristics of both a permanent magnet synchronous motor and a synchronous reluctance motor, has the remarkable advantages of high torque density, high reliability, small volume, light weight and the like, can also make full use of the reluctance torque of the motor, greatly reduces the using amount of rare earth permanent magnets, and even can completely replace the rare earth permanent magnets by ferrite, greatly reduces the no-load counter electromotive force of the motor, improves the reliability of a system, and thus becomes the best choice for replacing the permanent magnet motor and the synchronous reluctance motor. With the continuous development of the permanent magnet material industry, the process of permanent magnet molding is gradually diversified to meet the increasingly abundant requirements, and the degree of freedom of the design of the topological structures of the iron core and the permanent magnet is higher.
In the prior art, the end part of one side of the magnetic steel groove, which is far away from the axis of the rotor, is made into a mode of being communicated with the excircle of the rotor, so that the magnetic leakage degree at the magnetic isolation bridge of the excircle of the rotor is reduced, but the magnetic isolation bridge is removed and the permanent magnet is positioned by assembling a split rotor yoke and a fixed yoke, and the production and the assembly are complex.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a rotor punching sheet, a rotor core, a motor rotor, an assembling method and a motor, wherein the outer circle of the rotor punching sheet is not provided with a magnetic isolation bridge, so that the magnetic leakage at the magnetic isolation bridge can be reduced, the salient pole ratio of the rotor is improved, and the torque output capability of the motor is enhanced.
In order to solve the above problems, the present invention provides a rotor punching sheet, including a punching sheet body, where the punching sheet body has a plurality of magnetic pole forming regions corresponding to magnetic poles of a motor rotor, a first magnetic barrier groove is configured on the punching sheet body in each magnetic pole forming region, the first magnetic barrier groove is symmetric with respect to a d axis in the corresponding magnetic pole forming region and forms a first flare angle structure facing an outer peripheral side of the punching sheet body, a first magnetic separation bridge on the d axis is disposed at a bottom of the first magnetic barrier groove, the first magnetic barrier groove includes two first laterally extending magnetic barrier grooves symmetric with respect to the d axis, the first laterally extending magnetic barrier grooves include a first magnetic steel groove and a first air groove radially outward of the first magnetic steel groove, and the first air groove is communicated with an outer peripheral wall of the punching sheet body.
Preferably, a first air groove in the first laterally extending magnetic barrier groove on one side of the d-axis and the peripheral wall of the stamped sheet body have a first intersection point close to the d-axis and a second intersection point far away from the d-axis, a first air groove in the first laterally extending magnetic barrier groove on the other side of the d-axis and the peripheral wall of the stamped sheet body have a third intersection point close to the d-axis and a fourth intersection point far away from the d-axis, a connecting line between the first intersection point and the circle center of the stamped sheet body is a first straight line, a connecting line between the third intersection point and the circle center of the stamped sheet body is a second straight line, an included angle between the first straight line and the second straight line is β 2, a connecting line between the second intersection point and the circle center of the stamped sheet body is a third straight line, a connecting line between the fourth intersection point and the circle center of the stamped sheet body is a fourth straight line, and an included angle between the third straight line and the fourth straight line are β 1,
β2＝β1-2 °, wherein p is the number of pole pairs of the motor rotor corresponding to the rotor lamination.
Preferably, the first magnetic steel slot has a first constant width slot section and a first flared slot section at two ends of the first constant width slot section.
Preferably, the radial length of the first magnetic steel slot is L4, and the radial length of the first equal-width slot segment is L3, L3＝a2×L4Wherein
0.6<a2<0.8, D0 is the excircle diameter of punching sheet body.
Preferably, the first equal-width groove section has a groove width of W3, and the first flared groove section has a maximum groove width of W4, 1.02 < W4/W3 < 1.07.
Preferably, a second magnetic barrier groove located on the radial inner side of the first magnetic barrier groove is further constructed on the punching sheet body in each magnetic pole forming area, the second magnetic barrier groove is symmetrical about a d axis in the magnetic pole forming area corresponding to the second magnetic barrier groove and forms a second opening angle structure facing the outer peripheral side of the punching sheet body, a central magnetic steel groove perpendicular to the d axis and two second laterally extending magnetic barrier grooves located on two sides of the central magnetic steel groove and symmetrical about the d axis are formed in the bottom of the second magnetic barrier groove, each second laterally extending magnetic barrier groove comprises a second magnetic steel groove and a second air groove located on the radial outer side of the second magnetic steel groove, and each second air groove is communicated with the peripheral wall of the punching sheet body.
Preferably, a fifth intersection point close to the d-axis and a sixth intersection point far away from the d-axis are arranged between a second air groove in a second laterally extending magnetic barrier groove on one side of the d-axis and the peripheral wall of the punching sheet body, a seventh intersection point close to the d-axis and an eighth intersection point far away from the d-axis are arranged between a second air groove in a second laterally extending magnetic barrier groove on the other side of the d-axis and the peripheral wall of the punching sheet body, a fifth straight line is connected between the fifth intersection point and the circle center of the punching sheet body, a sixth straight line is connected between the seventh intersection point and the circle center of the punching sheet body, an included angle between the fifth straight line and the sixth straight line is γ 2, a seventh straight line is connected between the sixth intersection point and the circle center of the punching sheet body, an eighth straight line is connected between the eighth intersection point and the circle center of the punching sheet body, and an included angle between the seventh straight line and the eighth straight line are γ 1,
γ2＝γ1-7 °, wherein p is the motor rotor to which the rotor sheet correspondsThe number of pole pairs.
Preferably, the second magnetic steel slot has a second equal-width slot section and a second flared slot section at two ends of the second equal-width slot section.
Preferably, the radial length of the second magnetic steel slot is L2, and the radial length of the second equal-width slot segment is L1, L1＝a1×L2Wherein
0.6<a1<0.8, D0 is the excircle diameter of punching sheet body.
Preferably, the groove width of the second equal-width groove section is W1, and the maximum groove width of the second flaring groove section is W2, 1.02 < W2/W1 < 1.07.
Preferably, the first and second electrodes are formed of a metal,
wherein, 0.2<k1<0.25。
Preferably, 0.8 < W3/W1 < 0.9.
Preferably, the central magnetic steel groove is an arc-shaped magnetic steel groove, and the curvature center of the arc-shaped magnetic steel groove is located on one side of the arc-shaped magnetic steel groove, which faces the circle center of the punching sheet body.
Preferably, the arc vertex of the arc-shaped magnetic steel slot is located on a circle with the circle center of the punching sheet body as the circle center and the diameter of D3, and D3＝D0-k2×L2Wherein k is not less than 2.122.3 is less than or equal to, and D0 is towards the excircle diameter of piece body.
Preferably, a rivet hole is further formed in the punching sheet body on the radially outer side of the first magnetism isolating bridge, and the rivet hole is located in the opening angle range of the first tension angle structure.
Preferably, the center of the rivet hole is located on a circle with the circle center of the punching sheet body as the circle center and the diameter of D1, D1/D0 is more than 0.85 and less than 0.9, and D0 is the diameter of the outer circle of the punching sheet body.
The invention also provides a rotor core which comprises a plurality of laminated rotor punching sheets, wherein the rotor punching sheets are the rotor punching sheets.
The invention also provides a motor rotor, which comprises a rotor core and rotor baffles at two ends of the rotor core, wherein the rotor core is the rotor core, when rivet holes are formed in the rotor punching sheet, abdicating holes are correspondingly formed in the rotor baffles, the centers of the abdicating holes are positioned on a circle with the circle center of the punching sheet body as the circle center and the diameter of D2, and D1 is larger than D2.
Preferably, 0.03mm < D1-D2 < 0.09 mm.
The invention further provides a motor which comprises the motor rotor.
The invention also provides an assembling method of the motor rotor, which comprises the following steps:
(a) fixing preset overlapped rotor punching sheets by rivets to form a rotor core, wherein an outer circle magnetism isolating bridge is arranged on the outer peripheral wall of each rotor punching sheet;
(b) fixing and molding the permanent magnet in the magnetic steel groove corresponding to the rotor core through an injection molding process;
(c) assembling the rotor core and the rotating shaft into a whole after the permanent magnet is subjected to injection molding;
(d) and removing the outer circle magnetism isolating bridge on the outer peripheral wall of the rotor punching sheet.
Preferably, the outer circle magnetic isolation bridge is removed by means of mechanical finish machining
Preferably, step (c) further comprises:
and heating the rotor baffle plate, sleeving the rotor baffle plate and the rotating shaft into a whole, and enabling the extending end of the rivet to be positioned in the abdicating hole of the rotor baffle plate.
According to the rotor punching sheet, the rotor iron core, the motor rotor, the assembling method and the motor, on one hand, the first magnetic steel groove is communicated with the outer peripheral wall of the punching sheet body through the first air groove, and an outer circle magnetic isolation bridge in the related technology is removed, so that the outer circle of the punching sheet body is objectively made to be a magnetic isolation bridge-free structure, the magnetic leakage at the magnetic isolation bridge can be reduced, the rotor salient pole ratio is improved, and the torque output capacity of the motor is enhanced, on the other hand, the first magnetic barrier groove is integrally connected with the punching sheet body through the first magnetic isolation bridge, and the situation that the assembly is difficult due to the fact that the first magnetic steel groove and the punching sheet body are separated is avoided.
Drawings
Fig. 1 is a schematic structural diagram of a rotor sheet according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic structural diagram of a rotor sheet according to another embodiment of the present invention, in which the rotor sheet has an outer magnetic isolation bridge and is removed by a mechanical finishing process after being applied to a rotor core, so as to form the rotor sheet structure shown in FIG. 1;
fig. 4 is a schematic structural diagram of the rotor sheet shown in fig. 1 when corresponding permanent magnets are embedded in corresponding magnetic steel slots;
fig. 5 is a schematic structural view of a rotor sheet according to another embodiment of the present invention, in which corresponding permanent magnets are embedded in corresponding magnetic steel slots, and the difference between the rotor sheet and the rotor sheet shown in fig. 1 is that the central magnetic steel slot is arc-shaped;
fig. 6 is a schematic three-dimensional disassembled structure diagram of a motor rotor according to an embodiment of the present invention, in which a rotating shaft is not shown;
FIG. 7 is a schematic structural view of the rotor baffle of FIG. 6;
FIG. 8 is a graph showing the change of demagnetization factor with L3/L4;
FIG. 9 is a graph showing the change of demagnetization factor with L1/L2;
FIG. 10 is a magnetic flux density cloud chart of a rotor sheet without removing the outer circle magnetic isolation bridge;
fig. 11 is a magnetic density cloud chart of the rotor sheet without the outer circle magnetic isolation bridge, that is, the rotor sheet in the technical scheme of the present invention.
The reference numerals are represented as:
1. punching a sheet body; 2. a first magnetic barrier groove; 21. a first laterally extending magnetic barrier slot; 211. a first magnetic steel slot; 212. a first air tank; 22. a first magnetic isolation bridge; 3. a second magnetic barrier groove; 31. a central magnetic steel slot; 32. a second laterally extending magnetic barrier slot; 321. a second magnetic steel slot; 322. a second air tank; 323. a third air tank; 324. a second magnetic isolation bridge; 4. rivet holes; 100. a rotor core; 200. a rotor baffle; 201. a hole of abdication; 300. rotor punching sheets; 301. riveting; 302. the excircle separates the magnetic bridge; 303. and a permanent magnet.
Detailed Description
Referring to fig. 1 to 11 in combination, according to an embodiment of the present invention, there is provided a rotor punching sheet, including a punching sheet body 1, the punching sheet body 1 is provided with a plurality of magnetic pole forming areas corresponding to the magnetic poles of the motor rotor, a first magnetic barrier groove 2 is formed on the punching sheet body 1 in each magnetic pole forming area, the first magnetic barrier groove 2 is symmetrical about a d axis in a magnetic pole forming area corresponding to the first magnetic barrier groove and forms a first corner structure facing the outer periphery side of the punching sheet body 1, the bottom of the first barrier groove 2 has a first magnetic bridge 22 on the d-axis, the first barrier groove 2 comprises two first laterally extending barrier grooves 21 symmetrical about the d-axis, the first laterally extending magnetic barrier groove 21 comprises a first magnetic steel groove 211 and a first air groove 212 located on the radial outer side of the first magnetic steel groove 211, and the first air groove 212 is communicated with the outer peripheral wall of the punching sheet body 1. In the technical scheme, on one hand, the first magnetic steel groove 211 is communicated with the peripheral wall of the punching sheet body 1 through the first air groove 212, an excircle magnetism isolating bridge in the related technology is removed, the excircle magnetism isolating bridge is objectively made to be of a magnetism isolating bridge-free structure, so that the magnetic leakage at the magnetism isolating bridge can be reduced, the salient pole ratio of a rotor is improved, the torque output capacity of a motor is enhanced, and on the other hand, the first magnetic barrier groove 2 is connected with the punching sheet body 1 into a whole through the first magnetism isolating bridge 22, and the situation of difficulty in assembly caused by the split of the first magnetic steel groove and the punching sheet body 1 is avoided. Referring to fig. 10 and 11, fig. 10 is a magnetic flux density cloud chart of a rotor sheet without an outer circle magnetic isolation bridge, it can be seen that the magnetic flux density at the outer circle magnetic isolation bridge is saturated, and the corresponding area occupation ratio is high, while fig. 11 is a magnetic flux density cloud chart of a rotor sheet without the outer circle magnetic isolation bridge, that is, the rotor sheet in the technical scheme of the present invention, and the design of no magnetic bridge at the outer circle can be seen, so that the area occupation ratio of the magnetic flux density saturation area is reduced, the magnetic flux density saturation level of a magnetic conduction channel and a stator yoke part can be reduced, the channel through which magnetic lines pass is smooth, and the output of motor torque is favorably improved.
In order to further optimize the magnetic circuit and make the passage of the magnetic force lines pass more smoothly, preferably, the first air groove 212 in the first laterally extending magnetic barrier groove 21 on one side of the d axis and the outer peripheral wall of the stamped sheet body 1 have a first intersection point close to the d axis and a second intersection point far away from the d axis, the first air groove 212 in the first laterally extending magnetic barrier groove 21 on the other side of the d axis and the outer peripheral wall of the stamped sheet body 1 have a third intersection point close to the d axis and a fourth intersection point far away from the d axis, a connecting line between the first intersection point and the circle center of the stamped sheet body 1 is a first straight line, a connecting line between the third intersection point and the circle center of the stamped sheet body 1 is a second straight line, an included angle between the first straight line and the second straight line is β 2, and a connecting line between the second intersection point and the circle center of the stamped sheet body 1 is a third straight line, a connecting line between the fourth intersection point and the circle center of the punching sheet body 1 is a fourth straight line, an included angle between the third straight line and the fourth straight line is beta 1,
β2＝β1-2 °, wherein p is the number of pole pairs of the motor rotor corresponding to the rotor lamination.
Further, the first magnetic steel slot 211 has a first equal-width slot and first flared slot segments at two ends of the first equal-width slot, that is, the width of the first magnetic steel slot 211 in the extending direction is not completely the same any more, and the slot widths at two ends in the radial direction are larger and larger than the slot segments at the middle part, so that it can be understood that, at this time, the shape of the permanent magnet 303 embedded therein will be matched with the shape of the first magnetic steel slot 211, that is, the permanent magnet 303 here is in a barbell shape with two thick ends and a thin middle part, such a design can relieve the local demagnetization of the permanent magnet 303 at the corners, and at the same time, the overall structural strength of the rotor can be increased.
Preferably, the radial length of the first magnetic steel slot 211 is L4, and the radial length of the first equal-width slot segment is L3, in order to find a preferable design range of L3/L4Further, the demagnetization factor of the permanent magnet 303 in the first magnetic steel slot 211 is made as small as possible, and the inventors have made a lot of experiments and found the curve shown in fig. 8, and L can be found from fig. 83＝a2×L4Wherein
D0 is the excircle diameter of punching sheet body 1, when 0.6<a2<At 0.8, the demagnetization factor of the corresponding permanent magnet is in a lower range. The groove width of the first equal-width groove section is W3, the maximum groove width of the first flaring groove section is W4, and in order to further reduce the demagnetization rate of the corresponding permanent magnet 303, the first equal-width groove section is preferably 1.02 < W4/W3 < 1.07.
In some embodiments, a second magnetic barrier groove 3 located radially inside the first magnetic barrier groove 2 is further configured on the punch sheet body 1 in each magnetic pole forming area, the second magnetic barrier groove 3 is symmetric about a d axis in the corresponding magnetic pole forming area and forms a second opening angle structure facing an outer peripheral side of the punch sheet body 1, the bottom of the second magnetic barrier groove 3 has a central magnetic steel groove 31 perpendicular to the d axis and two second laterally extending magnetic barrier grooves 32 located on both sides of the central magnetic steel groove 31 and symmetric about the d axis, the second laterally extending magnetic barrier grooves 32 include a second magnetic steel groove 321 and a second air groove 322 located radially outside the second magnetic steel groove 321, and the second air groove 322 is communicated with an outer peripheral wall of the punch sheet body 1. The first magnetic barrier groove 2 and the second magnetic barrier groove 3 can provide permanent magnet torque of the motor and improve corresponding reluctance torque. The central magnetic steel groove 31 is perpendicular to the first magnetic isolation bridge 22 and located on the radial inner side of the first magnetic isolation bridge 22, and the magnetic resistance of a d shaft of the motor can be improved. It can be understood that, in order to improve the magnetic barrier effect of the second magnetic barrier groove 3, a third air groove 323 is further disposed on the radially inner side of the second magnetic steel groove 321, and a second magnetic isolation bridge 324 is disposed between the third air groove 323 and the central magnetic steel groove 31 to improve the structural strength of the rotor sheet.
A second laterally extending magnetic barrier groove 32 on one side of the d-axis, similar to the first magnetic barrier groove 2The second air groove 322 in the punching sheet body 1 and the peripheral wall of the punching sheet body 1 are provided with a fifth intersection point close to the d axis and a sixth intersection point far away from the d axis, the second air groove 322 in the second laterally extending magnetic barrier groove 32 on the other side of the d axis and the peripheral wall of the punching sheet body 1 are provided with a seventh intersection point close to the d axis and an eighth intersection point far away from the d axis, a fifth straight line is connected between the fifth intersection point and the circle center of the punching sheet body 1, a sixth straight line is connected between the seventh intersection point and the circle center of the punching sheet body 1, an included angle between the fifth straight line and the sixth straight line is gamma 2, a seventh straight line is connected between the sixth intersection point and the circle center of the punching sheet body 1, an eighth straight line is connected between the eighth intersection point and the circle center of the punching sheet body 1, and an included angle between the seventh straight line and the eighth straight line is gamma 1,
γ2＝γ1-7 °. Further, the second magnet steel slot 321 has a second equal-width slot section and a second flaring slot section at two ends of the second equal-width slot section.
Preferably, the radial length of the second magnetic steel slot 321 is L2, and the radial length of the second equal-width slot segment is L1In order to find a preferable design range of L1/L2 and further to make the demagnetization factor of the permanent magnet 303 in the second magnet steel slot 321 as small as possible, the inventors conducted a lot of experiments and obtained a curve shown in fig. 9, from which fig. 9L can be obtained1＝a1×L2Wherein
When 0.6<a1<At 0.8, the demagnetization factor of the corresponding permanent magnet is in a lower range. The groove width of the second equal-width groove section is W1, the maximum groove width of the second flaring groove section is W2, and in order to further reduce the demagnetization rate of the corresponding permanent magnet 303, the demagnetization rate is preferably 1.02 < W2/W1 < 1.07.
Further, in the above-mentioned case,
wherein, 0.2<k1<0.25。
Preferably, 0.8 < W3/W1 < 0.9.
In some embodiments, the central magnetic steel groove 31 is an arc-shaped magnetic steel groove, the curvature center of the arc-shaped magnetic steel groove is located on one side of the arc-shaped magnetic steel groove facing the center of the stamping sheet body 1, further, the arc vertex of the arc-shaped magnetic steel groove is located on a circle with the center of the stamping sheet body 1 as the center and the diameter of the arc-shaped magnetic steel groove as D3, and D is the diameter of the stamping sheet body 1 as the center of the circle3＝D0-k2×L2Wherein k is not less than 2.122.3, D0 is towards the excircle diameter of piece body 1, and it can be understood that the appearance of the permanent magnet 303 that inlays in the arc magnetic steel groove also is the arc that matches with its shape. In the technical scheme, the arc-shaped magnetic steel slot is matched with the corresponding permanent magnet, so that the sine degree of air gap flux density can be improved, the harmonic content of electromagnetic force is reduced, and the harmonic loss is reduced.
In some embodiments, a rivet hole 4 is further configured on the punching sheet body 1 at the radial outer side of the first magnetic isolation bridge 22, and the rivet hole 4 is located in an opening angle range of the first sheet angle structure, in an actual application process, a corresponding rivet 301 is inserted into the rivet hole 4, and the structural strength of the stacked rotor can be improved through the rivet 301. Furthermore, the center of the rivet hole 4 is located on a circle with the circle center of the punching sheet body 1 as the circle center and the diameter of D1, D1/D0 is more than 0.85 and less than 0.9, wherein D0 is the diameter of the outer circle of the punching sheet body 1, and the arrangement area of the rivet hole 4 is limited, so that the rivet hole is prevented from being too close to the outer circle of the punching sheet body 1, and the requirement on a punching sheet die is improved.
According to the embodiment of the invention, the rotor core comprises a plurality of laminated rotor punching sheets, and the rotor punching sheets are the rotor punching sheets.
According to an embodiment of the present invention, there is also provided a motor rotor, including a rotor core 100 and rotor guards 200 at two ends of the rotor core 100, where the rotor core 100 is the above-mentioned rotor core, when rivet holes 4 are formed in a rotor punching sheet, abdicating holes 201 are correspondingly formed in the rotor guards 200, centers of the abdicating holes 201 are located on a circle whose center is the center of the punching sheet body 1 and whose diameter is D2, D1 is greater than D2, that is, although the abdicating holes 201 in the rotor guards 200 and the rivet holes 4 are arranged in a one-to-one correspondence, the centers of the abdicating holes 201 are not concentric, that is, the centers of the abdicating holes 201 are located at a certain distance outside the center of the rivet holes 4, so that when the rotor guards 200 are specifically sleeved, the rotor guards 200 may be heated first to be expanded so that the centers of the abdicating holes 201 are radially outwardly offset and tend to be concentric with the rivet holes 4, therefore, the rivet 301 can pass through the rotor core, and after the assembly is finished, the abdicating hole 201 is radially and inwardly restored to the original position along with the cooling of the rotor baffle 200, so that the tension force of the rivet 301 towards the radial inner side can be applied, and the structural strength of the rotor core 100 is further improved. The material of the rotor baffle 200 is a non-magnetic material, such as aluminum or copper, specifically, D1-D2 is Δ, Δ is the thermal expansion (in mm) of the rotor baffle 200 at high temperature, the selection value is different according to the material, and when the material is aluminum, Δ is more than or equal to 0.03mm and less than or equal to 0.09 mm.
According to an embodiment of the present invention, there is also provided a motor, especially a permanent magnet assisted reluctance motor, including a motor rotor, where the motor rotor is the above-mentioned motor rotor.
According to an embodiment of the present invention, there is also provided an assembling method of a rotor of an electric machine, including the steps of:
(a) fixing a preset overlapped rotor punching sheet 300 through a rivet 301 to form a rotor core 100, wherein an outer circle magnetism isolating bridge 302 is arranged on the outer peripheral wall of the rotor punching sheet 300;
(b) the permanent magnet 303 is fixedly formed in the magnetic steel groove corresponding to the rotor core 100 through an injection molding process, and the permanent magnet 303 is formed through the injection molding process, so that the freedom degree of the structural design of the permanent magnet is improved, and the industrial production is facilitated;
(c) assembling the rotor core and the rotating shaft into a whole after the permanent magnet 303 is subjected to injection molding;
(d) and removing the outer circle magnetism isolating bridge 302 on the outer peripheral wall of the rotor punching sheet 300.
In the technical scheme, after the rotor punching sheet 300 with the outer circle magnetic isolation bridge 302 is adopted to form the corresponding rotor core 100, the outer circle magnetic isolation bridge 302 at the corresponding position is removed after the corresponding motor rotor is formed, so that the motor rotor forms a non-magnetic bridge rotor, the assembly forming process of the non-magnetic bridge rotor can be simplified, the assembled motor rotor has enough strength, and the machining deformation of the rotor punching sheet 300 can be effectively reduced by removing the outer circle magnetic isolation bridge 302 on the basis. Further, the outer magnetic isolation bridge 302 is removed by means of mechanical finishing.
In some embodiments, step c further comprises: the rotor baffle 200 is heated and then sleeved with the rotating shaft into a whole, the extending end of the rivet 301 is located in a yielding hole 201 of the rotor baffle 200, the rotor baffle 200 is heated firstly, so that the rotor baffle 200 can expand, the circle center of the yielding hole 201 is radially outwards deviated and tends to be concentric with the rivet hole 4, the rivet 301 can penetrate through the yielding hole, after the sleeving is finished, the yielding hole 201 is radially inwards restored to the original position along with the cooling of the rotor baffle 200, the tension force of the rivet 301 towards the radial inner side can be applied, and the structural strength of the rotor core 100 is further improved.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (21)
1. The rotor punching sheet is characterized by comprising a punching sheet body (1), wherein a plurality of punching sheets and electricity are arranged on the punching sheet body (1)The punching sheet comprises magnetic pole forming areas corresponding to magnetic poles of a machine rotor, wherein a first magnetic barrier groove (2) is constructed on a punching sheet body (1) in each magnetic pole forming area, the first magnetic barrier grooves (2) are symmetrical about a d axis in the corresponding magnetic pole forming area and form a first corner structure facing the outer peripheral side of the punching sheet body (1), a first magnetism isolating bridge (22) on the d axis is arranged at the bottom of each first magnetic barrier groove (2), each first magnetic barrier groove (2) comprises two first laterally extending magnetic barrier grooves (21) symmetrical about the d axis, each first laterally extending magnetic barrier groove (21) comprises a first magnetic steel groove (211) and a first air groove (212) located on the radial outer side of the first magnetic steel groove (211), and each first air groove (212) is communicated with the outer peripheral wall of the punching sheet body (1); the first magnetic steel groove (211) is provided with a first equal-width groove section and first flaring groove sections positioned at two extending ends of the first equal-width groove section, so that the first magnetic steel groove (211) is in a barbell shape with thick ends and thin middle; the radial length of the first magnetic steel groove (211) is L4, and the radial length of the first equal-width groove section is L3 and L3＝a2×L4Wherein
0.6<a2<0.8, D0 is the excircle diameter of punching sheet body (1).
2. The rotor lamination according to claim 1, wherein a first air groove (212) in the first laterally extending magnetic barrier groove (21) on one side of the d-axis has a first intersection point close to the d-axis and a second intersection point far from the d-axis with the outer peripheral wall of the lamination body (1), a first air groove (212) in a first laterally extending magnetic barrier groove (21) on the other side of the d axis and the peripheral wall of the punching sheet body (1) are provided with a third intersection point close to the d axis and a fourth intersection point far away from the d axis, a connecting line between the first intersection point and the circle center of the punching sheet body (1) is a first straight line, a connecting line between the third intersection point and the circle center of the punching sheet body (1) is a second straight line, the included angle between the first straight line and the second straight line is beta 2, and the connecting line between the second intersection point and the circle center of the punching sheet body (1) is the first.A fourth straight line is connected between the fourth intersection point and the circle center of the punching sheet body (1), an included angle between the third straight line and the fourth straight line is beta 1,
β2＝β1-2 °, where p is the number of pole pairs of the motor rotor corresponding to the rotor lamination, and p is 4.
3. The rotor sheet of claim 1, wherein the first constant width groove segment has a groove width of W3, and the first flared groove segment has a maximum groove width of W4, 1.02 < W4/W3 < 1.07.
4. The rotor punching according to claim 3, wherein a second magnetic barrier groove (3) is further formed on the punching body (1) in each magnetic pole forming region and is located at the radial inner side of the first magnetic barrier groove (2), the second magnetic barrier groove (3) is symmetrical about a d axis in a magnetic pole forming area corresponding to the second magnetic barrier groove and forms a second opening angle structure facing the outer peripheral side of the punching sheet body (1), the bottom of the second magnetic barrier groove (3) is provided with a central magnetic steel groove (31) arranged perpendicular to the d axis and two second laterally extending magnetic barrier grooves (32) which are positioned at two sides of the central magnetic steel groove (31) and are symmetrical to the d axis, the second laterally extending flux barrier slot (32) comprises a second magnet steel slot (321) and a second air slot (322) radially outward of the second magnet steel slot (321), the second air groove (322) is communicated with the peripheral wall of the punching sheet body (1).
5. The rotor lamination according to claim 4, wherein the second air slot (322) in the second laterally extending magnetic barrier slot (32) on one side of the d axis has a fifth intersection point close to the d axis and a sixth intersection point far away from the d axis with the outer peripheral wall of the lamination body (1), the second air slot (322) in the second laterally extending magnetic barrier slot (32) on the other side of the d axis has a seventh intersection point close to the d axis and an eighth intersection point far away from the d axis with the outer peripheral wall of the lamination body (1), and the fifth intersection pointA connecting line between the point and the circle center of the punching sheet body (1) is a fifth straight line, a connecting line between a seventh intersection point and the circle center of the punching sheet body (1) is a sixth straight line, an included angle between the fifth straight line and the sixth straight line is gamma 2, a connecting line between the sixth intersection point and the circle center of the punching sheet body (1) is a seventh straight line, a connecting line between an eighth intersection point and the circle center of the punching sheet body (1) is an eighth straight line, and an included angle between the seventh straight line and the eighth straight line is gamma 1,
γ2＝γ1-7 °, wherein p is the number of pole pairs of the motor rotor corresponding to the rotor lamination.
6. The rotor sheet according to claim 4, wherein the second magnet steel slot (321) has a second equi-wide slot section and second flared slot sections at both ends of the second equi-wide slot section extension.
7. The rotor sheet as recited in claim 6, wherein the second magnet steel slot (321) has a radial length of L2, and the second equal-width slot segment has a radial length of L1, L1＝a1×L2Wherein
0.6<a1<0.8, D0 is the excircle diameter of punching sheet body (1).
8. The rotor sheet as recited in claim 6, wherein the second constant width groove segment has a groove width of W1, and the second flared groove segment has a maximum groove width of W2, 1.02 < W2/W1 < 1.07.
9. The rotor sheet as recited in claim 8,
wherein, 0.2<k1<0.25。
10. The rotor sheet as recited in claim 8, wherein 0.8 < W3/W1 < 0.9.
11. The rotor punching sheet according to claim 6, wherein the central magnetic steel groove (31) is an arc-shaped magnetic steel groove, and the curvature center of the arc-shaped magnetic steel groove is located on one side of the arc-shaped magnetic steel groove facing the center of the punching sheet body (1).
12. The rotor punching sheet according to claim 11, wherein the arc vertex of the arc-shaped magnetic steel slot is located on a circle with the circle center of the punching sheet body (1) as the circle center and the diameter of D3, and D is the diameter of the punching sheet body3＝D0-k2×L2Wherein k is not less than 2.122.3, D0 is towards the excircle diameter of piece body (1).
13. The rotor punching sheet according to claim 1, wherein a rivet hole (4) is further formed in the punching sheet body (1) on the radial outer side of the first magnetism isolating bridge (22), and the rivet hole (4) is located in an opening angle range of the first tensile angle structure.
14. The rotor punching sheet according to claim 13, wherein the center of the rivet hole (4) is located on a circle with a diameter of D1 and with the circle center of the punching sheet body (1) as the center, and the diameter is 0.85 < D1/D0 < 0.9, wherein D0 is the diameter of the outer circle of the punching sheet body (1).
15. A rotor core, comprising a plurality of stacked rotor sheets, wherein the rotor sheets are the rotor sheets according to any one of claims 1 to 14.
16. The motor rotor comprises a rotor core (100) and rotor baffles (200) arranged at two ends of the rotor core (100), and is characterized in that the rotor core (100) is the rotor core as claimed in claim 15, when rivet holes (4) are formed in a rotor punching sheet, abdicating holes (201) are correspondingly formed in the rotor baffles (200), centers of the abdicating holes (201) are located on a circle with the circle center of the punching sheet body (1) as the circle center and the diameter as D2, and D1 is larger than D2.
17. The electric machine rotor as recited in claim 16, wherein 0.03mm ≦ D1-D2 ≦ 0.09 mm.
18. An electrical machine comprising a machine rotor, characterized in that the machine rotor is a machine rotor according to claim 16 or 17.
19. A method of assembling a rotor for an electrical machine according to claim 16 or 17, comprising the steps of:
(a) fixing a preset overlapped rotor punching sheet (300) through a rivet (301) to form a rotor core (100), wherein an outer circle magnetism isolating bridge (302) is arranged on the outer peripheral wall of the rotor punching sheet (300);
(b) the permanent magnet (303) is fixedly molded in a magnetic steel groove corresponding to the rotor iron core (100) through an injection molding process;
(c) assembling the rotor core and the rotating shaft into a whole after the permanent magnet (303) is subjected to injection molding;
(d) and removing the outer circle magnetism isolating bridge (302) on the outer peripheral wall of the rotor punching sheet (300).
20. The assembly method according to claim 19, characterized in that the external magnetically isolating bridge (302) is removed by means of mechanical finishing.
21. The method of assembling of claim 19, further comprising in step (c):
the rotor baffle (200) is heated and then sleeved with the rotating shaft into a whole, and the extending end of the rivet (301) is positioned in an abdicating hole (201) of the rotor baffle (200).
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| CN202110088064.1A CN112821608B (en) | 2021-01-22 | 2021-01-22 | Rotor punching sheet, rotor core, motor rotor, assembling method and motor |
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| CN202110088064.1A CN112821608B (en) | 2021-01-22 | 2021-01-22 | Rotor punching sheet, rotor core, motor rotor, assembling method and motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113726047A (en) * | 2021-08-25 | 2021-11-30 | 珠海格力电器股份有限公司 | Motor rotor and permanent magnet auxiliary reluctance motor with same |
| CN113783327A (en) * | 2021-08-26 | 2021-12-10 | 珠海格力电器股份有限公司 | Motor rotor, manufacturing method of motor rotor and permanent magnet auxiliary reluctance motor |
| CN116191726A (en) * | 2022-10-14 | 2023-05-30 | 广东美芝制冷设备有限公司 | Motor rotor with magnetic barrier, motor and compressor |
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| WO2010014844A2 (en) * | 2008-07-30 | 2010-02-04 | A.O. Smith Corporation | Interior permanent magnet motor including rotor with unequal poles |
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| CN201282373Y (en) * | 2008-10-27 | 2009-07-29 | 永济新时速电机电器有限责任公司 | Rotor of variable frequency permanent magnet synchronous motor |
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