CN114552911A - Method for designing rotor punching sheet of four-six-eight-pole motor - Google Patents
Method for designing rotor punching sheet of four-six-eight-pole motor Download PDFInfo
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- CN114552911A CN114552911A CN202210224516.9A CN202210224516A CN114552911A CN 114552911 A CN114552911 A CN 114552911A CN 202210224516 A CN202210224516 A CN 202210224516A CN 114552911 A CN114552911 A CN 114552911A
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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
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/0012—Manufacturing cage rotors
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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
- H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention provides a method for designing a rotor punching sheet of a four-six-eight-pole motor, and relates to the technical field of motors. The method comprises the following steps: the arc base lines L1, L2 and L3 are obtained by inwards shifting from the outer circle of the rotor; drawing 3 pairs of rays passing through the center of the circle and being symmetrical about the central axis ZX, the intersection points with L1 being P1, P2 and P3; drawing lines LL1, LL2 and LL3 through P1, P2 and P3 respectively, and searching three points on the three lines respectively to obtain lines LQ1, LQ2 and LQ3 which are perpendicular to the axis ZX; drawing parallel lines LM1, LM2, LM3, LN2 and LN3 of LL1, LL2 and LL3 shifted to the Y-axis direction; parallel lines LP1, LP2 and LP3 of LQ1, LQ2 and LQ3 which are shifted towards the center of the circle are drawn to enclose squirrel cage grooves C1, C2, C3 and 5 permanent magnet grooves. The method can reduce the consumption of permanent magnet materials of the asynchronous starting permanent magnet synchronous motor and improve the efficiency.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a method for designing rotor punching sheets of a four-six-eight-pole motor.
Background
At present, a permanent magnet synchronous motor adopts methods such as variable frequency starting or asynchronous starting. The self-starting permanent magnet synchronous motor (or called as an asynchronous starting permanent magnet synchronous motor) can be directly started in a grid-connected mode by an aluminum or copper squirrel cage arranged on a rotor by utilizing the starting principle of an asynchronous motor, and a frequency converter is omitted. The asynchronous starting permanent magnet synchronous motor also belongs to the field of permanent magnet synchronous motors, and adopts the starting principle of the asynchronous motor as the name suggests. When the motor is powered on, the three-phase current generates a rotating magnetic field in the stator. Due to the difference in rotational speed between the motor rotor and the rotating magnetic field, the rotating magnetic field induces a current in the cage. The induced current interacts with the rotating magnetic field to generate asynchronous torque, and the asynchronous torque pushes the rotor of the motor to rotate, so that the motor starts to start. When the rotor of the motor runs to the synchronous speed, namely the rotation speed difference between the rotor and the rotating magnetic field is zero, the current induced by the rotating magnetic field in the rotating self is zero, the motor enters a stable running state, and at the moment, the rotation of the motor depends on the interaction between the magnetic field generated by the permanent magnet in the rotor and the magnetic field in the stator.
The asynchronous starting permanent magnet synchronous motor is a permanent magnet synchronous motor with a squirrel cage groove and permanent magnets on a rotor, and can be directly started in a grid-connected mode and operated in a grid-connected mode; or the frequency converter can be started and then operated in a grid-connected mode. Compared with a permanent magnet synchronous motor driven by a frequency converter, the asynchronous starting permanent magnet synchronous motor in grid-connected operation has no frequency converter loss and motor high-frequency additional loss caused by frequency converter driving, so that the efficiency of the asynchronous starting permanent magnet synchronous motor is higher. The method has the advantages of high efficiency, simple starting and the like, and is widely applied to a grid-connected constant-speed driving scene. In order to realize high efficiency, the asynchronous starting permanent magnet synchronous motor adopts more neodymium iron boron rare earth materials, and the rare earth materials are expensive, so that the cost is higher.
Disclosure of Invention
The invention aims to provide a method for designing rotor punching sheets of a four-six-eight-pole motor, which can reduce the consumption of permanent magnet materials of an asynchronous starting permanent magnet synchronous motor and further improve the efficiency of the asynchronous starting permanent magnet synchronous motor.
Embodiments of the invention may be implemented as follows:
the invention provides a method for designing rotor punching sheets of a four-six eight-pole motor, which comprises the following steps:
s1: one pole of the rotor punching sheet of the four-six-eight-pole motor is designed into three sectors, the spreading angles of the three sectors are respectively 90 degrees, 60 degrees and 45 degrees, the rotor structure under one pole is symmetrical about a central axis ZX, and the excircle radius of the rotor punching sheet of the four-six-eight-pole motor is R2;
s2: respectively offsetting the distances of r1, r2 and r3 from the outer circle of the rotor inwards to obtain three circular arc base lines L1, L2 and L3;
s3: drawing 3 pairs of rays which pass through the circle center and are symmetrical about a central axis ZX, wherein the spreading angles among the 3 pairs of rays are a1, a2 and a3 respectively, and the intersection points of the rays on one side of the central axis ZX and L1 are P1, P2 and P3 respectively;
s4: respectively drawing straight lines LL1, LL2 and LL3 through P1, P2 and P3, wherein included angles between LL1, LL2 and LL3 and a boundary Y are respectively b1, b2 and b3, respectively searching three points Q1, Q2 and Q3 on LL1, LL2 and LL3, so that Q1, Q2 and Q3 are located in a region between an arc line L3 and an inner circle of a rotor punching sheet, and straight lines passing through three points Q1, Q2 and Q3 and perpendicular to a ZX axis are respectively LQ1, LQ2 and LQ 3;
s5: parallel lines LM1, LM2 and LM3 of LL1, LL2 and LL3 which are deviated towards the Y-axis direction are drawn, a squirrel-cage groove C1 is enclosed by the LL1, the LL2 and the LL3, a squirrel-cage groove C2 is enclosed by the LM1 and the LM2, and a squirrel-cage groove C3 is enclosed by the L1, the L2 and the LM 3;
s6: drawing parallel lines LN2 and LN3 of LL2 and LL3 which are shifted towards the Y-axis direction, drawing parallel lines LP1, LP2 and LP3 of LQ1, LQ2 and LQ3 which are shifted towards the center of the circle, arranging reinforcing ribs d1, d2, d3, d4 and d5, wherein d1, d3 and d5 are positioned at the central axis, d2 is positioned at the point Q2 close to the Y-axis side, and d4 is positioned at the point Q3 close to the Y-axis side;
s7: the magnetic suspension permanent magnet motor is characterized in that 5 permanent magnet grooves M1, M21, M22, M31 and M32 are surrounded by L3, LL1, LL2, LL3, LM1, LM2, LM3, LN2, LN3, LQ1, LQ2, LQ3, LP1, LP2 and LP3 and reinforcing ribs respectively, and cavities for placing rectangular permanent magnets are formed through positioning steps.
In an optional embodiment, in S1, the range of the outer circle radius R2 is: 28 mm-250 mm.
In an optional embodiment, in S2, r1 and r3 are widths of the magnetic isolation bridge, and have a value range of: 0.5 mm-3 mm, and the value range of R2 is 10% -15% of the excircle radius R2.
In an optional embodiment, in S3, the value range of a1 is: (0.27-0.35) x 180/p degrees, wherein the value range of a2 is as follows: (0.52-0.60) x 180/p degrees, wherein the value range of a3 is as follows: (0.77-0.84) x 180/p degrees, wherein p is the number of pole pairs of the motor.
In an alternative embodiment, in S4, the value ranges of b1, b2, and b3 are: 0 to 15 °, X11 ═ X12, (0.95 to 1.05) X3832, X21 ═ X22 (0.95 to 1.05), and X31 ═ X32 (0.95 to 1.05).
In an optional embodiment, in S5, h1 is not less than h2 is not less than h3, and the value range of h3 is 3% -6.5% of the external radius R2.
In an optional embodiment, in S6, p1 ≤ p2 ≤ p3, p3 is 2% -4% of the outer circle radius R2, and d1, d2, d3, d4 and d5 are: 0-3 mm; when the values of d1, d2, d3, d4 and d5 are 0, no reinforcing rib is present, and the grooves on the two sides are communicated.
In an alternative embodiment, in S7, the distance from the boundary of the permanent magnet cavity in M21 to point Q2 is f2, and the cavity width is y 21; the distance from the boundary of the permanent magnet cavity in the M31 to the point Q3 is f3, and the width of the cavity is y 31; the absence of a permanent magnet in the cavity is indicated by y21 and y31 taking 0.
In an alternative embodiment, in S7, the widths of the permanent magnet cavities in M1, M22, and M32 are y1, y22, and y32, respectively; the width of the positioning step is c1, and the height of the positioning step is c 2; all the permanent magnet slots do not interfere with each other and are positioned in the area between the arc line L3 and the inner circle of the rotor punching sheet; the average gap between the permanent magnet and the cavity is e 1.
In an optional embodiment, in S7, the value range of c1 is: 1 mm-3 mm, and the value range of c2 is as follows: 0.5 mm-2 mm, the value range of e1 is: 0.1 mm-0.2 mm.
The method for designing the rotor punching of the four-six-eight-pole motor provided by the embodiment of the invention has the beneficial effects that:
1. the invention integrates the characteristics of a cage-type asynchronous motor, a synchronous reluctance motor and a permanent magnet synchronous motor, drawn stamped sheets can be added with fixed structures such as bolt holes or rivet holes and then are laminated into a rotor core, cast aluminum is injected into a squirrel cage groove through an aluminum casting process to form a squirrel cage for starting and damping, and permanent magnets are inserted into permanent magnet grooves to form a rotor of the self-starting permanent magnet motor;
2. the rotor made of the drawn stamped sheet has the same multilayer magnetic barriers as a synchronous reluctance motor, the rotor has a larger salient pole ratio, and the formed permanent magnet synchronous motor has a larger proportion of reluctance torque and reduces the proportion of the permanent magnet torque in the total torque, so that the consumption of permanent magnet materials is reduced, and the total cost of the motor is further reduced;
3. the permanent magnet synchronous motor manufactured by using the drawn sheet has the advantages that the flux density is reduced due to the reduction of the using amount of the permanent magnet, the iron loss is reduced, and the efficiency of rated load and low load is improved;
4. the permanent magnet synchronous motor manufactured by the drawn stamped sheet adopts the quadrangle-like structure instead of the cage-like asynchronous motor rotor groove structure, and the formed cage groove is the extension of the magnetic barrier groove, so that the no-load cogging torque and the torque fluctuation during loading are small.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 to 4 are schematic structural diagrams of a rotor sheet design process;
FIG. 5 is a schematic structural diagram of a stator and a rotor sheet of the 280-4 permanent magnet synchronous motor;
FIG. 6 is a schematic structural diagram of a stator and a rotor sheet of a 180-6 permanent magnet synchronous motor;
fig. 7 is a schematic structural diagram of a stator and a rotor sheet of the 355-8 permanent magnet synchronous motor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1 to 4, a shaded portion in fig. 1 to 4 is a cross section of cast aluminum or a permanent magnet.
The embodiment provides a method for designing rotor punching sheets of a four-six eight-pole motor, which comprises the following steps:
s1: one pole of the four-six eight-pole motor rotor punching sheet is designed into three sectors, the spreading angles of the three sectors are respectively 90 degrees, 60 degrees and 45 degrees, the rotor structure under one pole is symmetrical about a central shaft ZX, and the outer circle radius of the four-six eight-pole motor rotor punching sheet is R2.
Specifically, please refer to fig. 1, according to the symmetry, one pole of the 4-pole, 6-pole and 8-pole motor rotor punching is designed, which is respectively a sector with an expansion angle of 90 °, 60 ° and 45 °, and the rotor structure under one pole is bilaterally symmetric about the central axis ZX, the outer radius of the rotor punching is R2, and the value range of the outer radius R2 is: 28 mm-250 mm, the radius of the inner circle is Ri2, the starting radial boundary of the sector is X and Y, wherein p is the number of pole pairs of the motor, and the number of poles is 2, 3 and 4 according to 4, 6 and 8 respectively.
S2: the three arc base lines L1, L2 and L3 are obtained by respectively offsetting the distances r1, r2 and r3 from the outer circle of the rotor inwards.
Specifically, referring to fig. 1, the distances r1, r2 and r3 are respectively shifted from the outer circle of the rotor inwards to obtain three circular arc base lines L1, L2 and L3. r1 and r3 are the widths of the magnetic isolation bridge, and the value ranges are as follows: 0.5 mm-3 mm, and the value range of R2 is 10% -15% of the excircle radius R2.
S3: drawing 3 pairs of rays passing through the center of the circle and being symmetric about the central axis ZX, the angles spread between the 3 pairs of rays are a1, a2 and a3 respectively, and the intersections of the central axis ZX side rays with L1 are P1, P2 and P3 respectively.
Specifically, please refer to fig. 1, 3 pairs of rays passing through the center of the circle and symmetric with respect to the center line ZX are drawn, the angles spread between the 3 pairs of rays are a1, a2 and a3, respectively, and the value range of a1 is: (0.27-0.35) x 180/p degrees, wherein the value range of a2 is as follows: (0.52-0.60) x 180/p degrees, wherein the value range of a3 is as follows: (0.77-0.84) x 180/p degrees, wherein p is the number of pole pairs of the motor. The intersection points of the ray on one side of the central line and L1 are P1, P2 and P3 respectively.
S4: lines LL1, LL2 and LL3 are drawn through P1, P2 and P3 respectively, included angles between LL1, LL2 and LL3 and a boundary Y are b1, b2 and b3 respectively, three points Q1, Q2 and Q3 are found on LL1, LL2 and LL3 respectively, so that Q1, Q2 and Q3 are located in the area between an arc line L3 and an inner circle of a rotor punching sheet, and lines passing through three points Q1, Q2 and Q3 and perpendicular to the ZX axis are LQ1, LQ2 and LQ3 respectively.
Specifically, referring to fig. 1 and 2, straight lines LL1, LL2, and LL3 are drawn through P1, P2, and P3, respectively. The included angles between LL1, LL2, LL3 and boundary Y are b1, b2, and b3, respectively. The value ranges of b1, b2 and b3 are as follows: 0 to 15 degrees.
Respectively searching three points Q1, Q2 and Q3 on LL1, LL2 and LL3, so that X11 is (0.95-1.05) X12, X21 is (0.95-1.05) X22, X31 is (0.95-1.05) X32, and three points Q1, Q2 and Q3 are located in an area between an arc line L3 and the inner circle of a rotor punching sheet; the lines perpendicular to the ZX axis passing through the three points Q1, Q2, and Q3 are LQ1, LQ2, and LQ3, respectively.
S5: parallel lines LM1, LM2 and LM3 of LL1, LL2 and LL3 which are deviated towards the Y-axis direction are drawn, a squirrel cage groove C1 is enclosed by the LL1, the LL2 and the LL3, a squirrel cage groove C2 is enclosed by the LM1 and the LM2, and a squirrel cage groove C3 is enclosed by the L1, the L2 and the LM 3.
Specifically, please refer to fig. 1 to 3, and parallel lines LM1, LM2, and LM3 in which LL1, LL2, and LL3 are shifted in the Y axis direction are drawn, the shifting distances are h1, h2, and h3, respectively, h1 is not less than h2 is not less than h3, and the value range of h3 is 3% to 6.5% of the excircle radius R2.
LL1, LL2 and LL3 enclose cage groove C1, LM1 and LM2 enclose cage groove C2, and L1, L2 and LM3 enclose cage groove C3.
S6: parallel lines LN2 and LN3 of LL2 and LL3, which are shifted to the Y-axis direction, are drawn, parallel lines LP1, LP2 and LP3 of LQ1, LQ2 and LQ3, which are shifted to the center direction, are drawn, and reinforcing ribs d1, d2, d3, d4 and d5 are arranged, d1, d3 and d5 are located at the central axis, d2 is located at the side of the point Q2 close to the Y-axis, and d4 is located at the side of the point Q3 close to the Y-axis.
Specifically, please refer to fig. 1 to 3, and draw parallel lines LN2 and LN3 of LL2 and LL3 shifted in the Y-axis direction by p2 and p3, respectively; drawing parallel lines LP1, LP2 and LP3 of LQ1, LQ2 and LQ3, which are shifted towards the center of the circle by p1, p2 and p3 respectively; p1 is not less than p2 is not less than p3, and the value range of p3 is 2-4% of the excircle radius R2; and arranging reinforcing ribs d1, d2, d3, d4 and d5, wherein d1, d3 and d5 are positioned at the central axis, d2 is positioned at the point Q2 close to the side of the Y axis, and d4 is positioned at the point Q3 close to the side of the Y axis. The value ranges of d1, d2, d3, d4 and d5 are as follows: 0-3 mm; when d1, d2, d3, d4 and d5 are 0, no rib is present, and the grooves on both sides are communicated with each other.
S7: the permanent magnet slot is formed by L3, LL1, LL2, LL3, LM1, LM2, LM3, LN2, LN3, LQ1, LQ2, LQ3, LP1, LP2 and LP3, and reinforcing ribs which surround 5 permanent magnet slots M1, M21, M22, M31 and M32 respectively, and a cavity for placing rectangular permanent magnets is formed by positioning steps.
Specifically, referring to fig. 1 to 4, L3, LL1, LL2, LL3, LM1, LM2, LM3, LN2, LN3, LQ1, LQ2, LQ3, LP1, LP2, and LP3, and the reinforcing ribs surround M1, M21, M22, M31, M325 permanent magnet slots M1, M21, M22, M31, and M32, respectively, and form a cavity for placing rectangular permanent magnets by positioning steps; the distance from the boundary of the permanent magnet cavity in the M21 to the point Q2 is f2, and the width of the cavity is y 21; the distance from the boundary of the permanent magnet cavity in the M31 to the point Q3 is f3, and the width of the cavity is y 31; y21 and y31 take 0 to indicate that there is no permanent magnet in the cavity; the widths of the permanent magnet cavities in M1, M22 and M32 are y1, y22 and y32 respectively; the width of the positioning step is c1, the height is c2, and the value range of c1 is as follows: 1 mm-3 mm, and the value range of c2 is as follows: 0.5 mm-2 mm; all the permanent magnet slots do not interfere with each other and are positioned in the area between the arc line L3 and the inner circle of the rotor punching sheet; the average gap between the permanent magnet and the cavity is e1, and the value range of e1 is as follows: 0.1 mm-0.2 mm.
The numbering of the permanent magnet slots and the cage slots in the above description also refers to the slots which are symmetrical with respect to ZX.
Taking a 280-4 (machine base number 280, pole number 4) permanent magnet synchronous motor as an example, the design parameters are shown in table 1, and the structure of the rotor sheet is shown in fig. 5.
Design parameters of tables 1280-4
Because no reinforcing rib (with the width of 0) is arranged between the M1 and the symmetrical groove of the rotor punching sheet, the M1 and the symmetrical groove of the rotor punching sheet are combined into a groove. The symmetrical groove is a symmetrical groove about the central axis ZX.
Another 180-6 (machine base number is 180, pole number is 6) permanent magnet synchronous motor is taken as an example, the design parameters are shown in table 2, and the structure of the rotor sheet is shown in fig. 6.
Table 2180-6 rotor sheet design parameters
Because no reinforcing rib (the width is 0) is arranged between the M1 and the symmetrical groove thereof, between the M22 and the symmetrical groove thereof, and between the M32 and the symmetrical groove thereof, the M1 and the symmetrical groove thereof are combined into one groove, between the M22 and the symmetrical groove thereof are combined into one groove, and between the M32 and the symmetrical groove thereof are combined into one groove. The symmetrical groove is a symmetrical groove about the central axis ZX.
Another 355-8 (with a machine base number of 355 and a pole number of 8) permanent magnet synchronous motor is taken as an example, the design parameters are shown in table 3, and the structure of the rotor sheet is shown in fig. 7.
Design parameters of tables 3355-8
The rotor punching sheets are all formed by punching silicon steel sheets, and permanent magnets in the rotor which is manufactured by laminating are made of neodymium iron boron or ferrite permanent magnet materials. The permanent magnet synchronous motor adopting the punching sheet achieves the efficiency of IE5, and the use amount of permanent magnets is reduced.
The method for designing the rotor punching of the four-six-eight-pole motor provided by the embodiment of the invention has the beneficial effects that:
1. the invention integrates the characteristics of a cage-type asynchronous motor, a synchronous reluctance motor and a permanent magnet synchronous motor, drawn stamped sheets can be added with fixed structures such as bolt holes or rivet holes and then are laminated into a rotor core, cast aluminum is injected into a squirrel cage groove through an aluminum casting process to form a squirrel cage for starting and damping, and permanent magnets are inserted into permanent magnet grooves to form a rotor of the self-starting permanent magnet motor;
2. the rotor made of the drawn stamped sheet has the same multilayer magnetic barriers as a synchronous reluctance motor, the rotor has a larger salient pole ratio, and the formed permanent magnet synchronous motor has a larger proportion of reluctance torque and reduces the proportion of the permanent magnet torque in the total torque, so that the consumption of permanent magnet materials is reduced, and the total cost of the motor is further reduced;
3. the permanent magnet synchronous motor manufactured by using the drawn sheet has the advantages that the flux density is reduced due to the reduction of the using amount of the permanent magnet, the iron loss is reduced, and the efficiency of rated load and low load is improved;
4. the permanent magnet synchronous motor manufactured by the drawn stamped sheet adopts the quadrangle-like structure instead of the cage-like asynchronous motor rotor groove structure, and the formed cage groove is the extension of the magnetic barrier groove, so that the no-load cogging torque and the torque fluctuation during loading are small.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for designing rotor punching sheets of a four-six-eight-pole motor is characterized by comprising the following steps of:
s1: one pole of the rotor punching sheet of the four-six eight-pole motor is designed into three sectors, the spreading angles of the three sectors are respectively 90 degrees, 60 degrees and 45 degrees, the rotor structure under one pole is symmetrical about a central axis ZX, and the excircle radius of the rotor punching sheet of the four-six eight-pole motor is R2;
s2: respectively offsetting the distances of r1, r2 and r3 from the outer circle of the rotor inwards to obtain three circular arc base lines L1, L2 and L3;
s3: drawing 3 pairs of rays which pass through the circle center and are symmetrical about a central axis ZX, wherein the spreading angles among the 3 pairs of rays are a1, a2 and a3 respectively, and the intersection points of the rays on one side of the central axis ZX and L1 are P1, P2 and P3 respectively;
s4: drawing straight lines LL1, LL2 and LL3 through P1, P2 and P3 respectively, wherein included angles between LL1, LL2 and LL3 and a boundary Y are b1, b2 and b3 respectively, searching three points Q1, Q2 and Q3 on LL1, LL2 and LL3 respectively, enabling Q1, Q2 and Q3 to be located in the area between an arc line L3 and an inner circle of a rotor punching sheet, and enabling the straight lines passing through three points Q1, Q2 and Q3 and perpendicular to the ZX axis to be LQ1, LQ2 and LQ3 respectively;
s5: parallel lines LM1, LM2 and LM3 of LL1, LL2 and LL3 which are deviated towards the Y-axis direction are drawn, a squirrel-cage groove C1 is enclosed by the LL1, the LL2 and the LL3, a squirrel-cage groove C2 is enclosed by the LM1 and the LM2, and a squirrel-cage groove C3 is enclosed by the L1, the L2 and the LM 3;
s6: drawing parallel lines LN2 and LN3 of LL2 and LL3 which are shifted towards the Y-axis direction, drawing parallel lines LP1, LP2 and LP3 of LQ1, LQ2 and LQ3 which are shifted towards the center of the circle, arranging reinforcing ribs d1, d2, d3, d4 and d5, wherein d1, d3 and d5 are positioned at the central axis, d2 is positioned at the point Q2 close to the Y-axis side, and d4 is positioned at the point Q3 close to the Y-axis side;
s7: the permanent magnet slot comprises L3, LL1, LL2, LL3, LM1, LM2, LM3, LN2, LN3, LQ1, LQ2, LQ3, LP1, LP2, LP3 and reinforcing ribs which respectively enclose 5 permanent magnet slots M1, M21, M22, M31 and M32.
2. The method for designing rotor sheets of a four-six-eight-pole motor according to claim 1, wherein in S1, the value range of the outer circle radius R2 is as follows: 28 mm-250 mm.
3. The method for designing rotor sheets of a four-six-eight-pole motor according to claim 1, wherein in S2, r1 and r3 are widths of magnetic isolation bridges, and a value range is as follows: 0.5 mm-3 mm, and the value range of R2 is 10% -15% of the excircle radius R2.
4. The method for designing rotor sheets of a four-six-eight-pole motor according to claim 1, wherein in S3, the value range of a1 is as follows: (0.27-0.35) x 180/p degrees, wherein the value range of a2 is as follows: (0.52-0.60) x 180/p degrees, wherein the value range of a3 is as follows: (0.77-0.84) multiplied by 180/p degrees, wherein p is the number of pole pairs of the motor.
5. The design method for rotor sheets of a four-six-eight-pole motor according to claim 1, wherein in S4, the value ranges of b1, b2 and b3 are as follows: 0 to 15 °, X11 ═ X12, (0.95 to 1.05) X3832, X21 ═ X22 (0.95 to 1.05), and X31 ═ X32 (0.95 to 1.05).
6. The method for designing rotor sheets of a four-six-eight-pole motor as claimed in claim 1, wherein in S5, h1 is not less than h2 is not less than h3, and the value range of h3 is 3% -6.5% of the external circle radius R2.
7. The method for designing rotor sheets of a four-six-eight-pole motor according to claim 1, wherein in S6, p2 and p3 are both more than or equal to p1 and less than or equal to p3, the value range of p3 is 2% -4% of the outer circle radius R2, and the value ranges of d1, d2, d3, d4 and d5 are as follows: 0-3 mm; when the values of d1, d2, d3, d4 and d5 are 0, no reinforcing rib is present, and the grooves on the two sides are communicated.
8. The design method for rotor sheets of a four-six-eight-pole motor according to claim 1, wherein in S7, the distance from the boundary of the permanent magnet cavity in M21 to the point Q2 is f2, and the width of the cavity is y 21; the distance from the boundary of the permanent magnet cavity in the M31 to the point Q3 is f3, and the width of the cavity is y 31; the absence of a permanent magnet in the cavity is indicated by y21 and y31 taking 0.
9. The design method for rotor sheets of a four-six-eight pole motor according to claim 8, wherein in S7, the widths of permanent magnet cavities in M1, M22 and M32 are y1, y22 and y32 respectively; the width of the positioning step is c1, and the height of the positioning step is c 2; all the permanent magnet slots do not interfere with each other and are positioned in the area between the arc line L3 and the inner circle of the rotor punching sheet; the average gap between the permanent magnet and the cavity is e 1.
10. The method for designing rotor sheets of a four-six-eight-pole motor according to claim 9, wherein in S7, the value range of c1 is as follows: 1 mm-3 mm, and the value range of c2 is as follows: 0.5 mm-2 mm, the value range of e1 is: 0.1 mm-0.2 mm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006254696A (en) * | 2006-05-15 | 2006-09-21 | Toshiba Corp | Permanent magnet system of reluctance-type dynamo-electric machine |
| WO2016183706A1 (en) * | 2015-05-15 | 2016-11-24 | 佛山市威灵洗涤电机制造有限公司 | Three-phase variable frequency electric motor and washing machine |
| CN112671127A (en) * | 2020-12-17 | 2021-04-16 | 珠海格力电器股份有限公司 | Rotor structure, motor and rotor machining method |
| CN114094738A (en) * | 2021-11-16 | 2022-02-25 | 珠海格力电器股份有限公司 | Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor |
| CN114123580A (en) * | 2021-11-16 | 2022-03-01 | 珠海格力电器股份有限公司 | Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor |
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- 2022-03-09 CN CN202210224516.9A patent/CN114552911B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006254696A (en) * | 2006-05-15 | 2006-09-21 | Toshiba Corp | Permanent magnet system of reluctance-type dynamo-electric machine |
| WO2016183706A1 (en) * | 2015-05-15 | 2016-11-24 | 佛山市威灵洗涤电机制造有限公司 | Three-phase variable frequency electric motor and washing machine |
| CN112671127A (en) * | 2020-12-17 | 2021-04-16 | 珠海格力电器股份有限公司 | Rotor structure, motor and rotor machining method |
| CN114094738A (en) * | 2021-11-16 | 2022-02-25 | 珠海格力电器股份有限公司 | Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor |
| CN114123580A (en) * | 2021-11-16 | 2022-03-01 | 珠海格力电器股份有限公司 | Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor |
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