CN114552911B - Design method of four-six-eight-pole motor rotor punching sheet - Google Patents
Design method of four-six-eight-pole motor rotor punching sheet Download PDFInfo
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- CN114552911B CN114552911B CN202210224516.9A CN202210224516A CN114552911B CN 114552911 B CN114552911 B CN 114552911B CN 202210224516 A CN202210224516 A CN 202210224516A CN 114552911 B CN114552911 B CN 114552911B
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a design method of a four-six-eight-pole motor rotor punching sheet, and relates to the technical field of motors. The method comprises the following steps: shifting inwards from the outer circle of the rotor to obtain arc baselines L1, L2 and L3; drawing 3 pairs of rays which pass through the circle center and are symmetrical about the central axis ZX, wherein the intersection points of the rays and L1 are P1, P2 and P3; drawing straight lines LL1, LL2 and LL3 through P1, P2 and P3 respectively, and searching three points on the three straight lines respectively to make straight lines LQ1, LQ2 and LQ3 perpendicular to the ZX axis; drawing parallel lines LM1, LM2, LM3, LN2 and LN3 of which LL1, LL2 and LL3 are offset in the Y-axis direction; drawing parallel lines LP1, LP2 and LP3 of LQ1, LQ2 and LQ3 which are offset towards the circle center direction, and enclosing squirrel cage grooves C1, C2 and C3 and 5 permanent magnet grooves. The method can reduce the permanent magnet material consumption 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 design method of a four-six-eight-pole motor rotor punching sheet.
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 utilizing an asynchronous motor starting principle through an aluminum or copper squirrel cage arranged on a rotor, and a frequency converter is omitted. The asynchronous starting permanent magnet synchronous motor belongs to the category of permanent magnet synchronous motors, and adopts the starting principle of the asynchronous motor as the name implies. When the motor is powered on, the three-phase currents produce a rotating magnetic field in the stator. Because of the rotational speed difference between the motor rotor and the rotating magnetic field, the rotating magnetic field induces a current in the squirrel 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 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-rotation is zero, the motor enters a stable running state, and at the moment, the rotation of the motor is interacted with the magnetic field in the stator by virtue of the magnetic field generated by the permanent magnets in the rotor.
The asynchronous starting permanent magnet synchronous motor is a permanent magnet synchronous motor with a squirrel cage groove and a permanent magnet on a rotor, and can be directly connected to the grid for starting and grid-connected operation; and the frequency converter can also be started and then run 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 high-frequency additional loss of the motor caused by the 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 grid-connected constant-speed driving scenes. 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 high in price, so that the cost is high.
Disclosure of Invention
The invention aims to provide a design method of a rotor punching sheet of a four-six-eight-pole motor, which can reduce the permanent magnet material consumption of an asynchronously-started permanent magnet synchronous motor and further improve the efficiency of the asynchronously-started permanent magnet synchronous motor.
Embodiments of the invention may be implemented as follows:
the invention provides a design method of a four-six-eight-pole motor rotor punching sheet, which comprises the following steps:
s1: one pole of the four-six-eight-pole motor rotor punching sheet is designed into three sectors, the unfolding angles of the three sectors are 90 degrees, 60 degrees and 45 degrees respectively, the rotor structure under one pole is symmetrical about a central axis ZX, and the outer circle radius of the four-six-eight-pole motor rotor punching sheet is R2;
s2: the distances of r1, r2 and r3 are respectively offset inwards from the outer circle of the rotor, so that three arc baselines L1, L2 and L3 are obtained;
s3: drawing 3 pairs of rays which pass through the circle center and are symmetrical about a central axis ZX, wherein the unfolding angles between 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 the LL1, LL2 and LL3 and a boundary Y are b1, b2 and b3 respectively, and searching three points Q1, Q2 and Q3 on the LL1, LL2 and LL3 respectively, so that the Q1, Q2 and Q3 are positioned in a region between an arc L3 and the inner circle of a rotor punching sheet, and straight lines perpendicular to the ZX axis through the three points Q1, Q2 and Q3 are LQ1, LQ2 and LQ3 respectively;
s5: drawing parallel lines LM1, LM2 and LM3 of LL1, LL2 and LL3 which are offset towards the Y-axis direction, wherein the offset distances are h1, h2 and h3 respectively, LL1, LM1, L1 and L2 enclose a squirrel cage groove C1, LL2, LM2, L1 and L2 enclose a squirrel cage groove C2, and LL3, LM3, L1 and L2 enclose a squirrel cage groove C3;
s6: drawing parallel lines LN2 and LN3 of LL2 and LL3 which are offset towards the Y axis, drawing parallel lines LP1, LP2 and LP3 of LQ1, LQ2 and LQ3 which are offset towards the circle center, wherein the offset distances are p1, p2 and p3 respectively, reinforcing ribs d1, d2, d3, d4 and d5 are arranged, d1, d3 and d5 are positioned at the central axis, d2 is positioned on one side of the Q2 point close to the Y axis, and d4 is positioned on one side of the Q3 point close to the Y axis;
s7: the L3, LL1, LL2, LL3, LM1, LM2, LM3, LN2, LN3, LQ1, LQ2, LQ3, LP1, LP2 and LP3, and the reinforcing ribs respectively enclose 5 permanent magnet slots M1, M21, M22, M31, M32, and a cavity for placing the rectangular permanent magnets is formed by positioning steps.
In an alternative embodiment, in S1, the value range of the outer circle radius R2 is: 28 mm-250 mm.
In an alternative embodiment, in S2, r1 and r3 are widths of the magnetic isolation bridge, and the value range is: the value range of R2 is 10-15% of the radius R2 of the outer circle, and the range is 0.5-3 mm.
In an alternative embodiment, in S3, the value range of a1 is: (0.27-0.35). Times.180/p DEG, the value range of a2 is as follows: (0.52-0.60). Times.180/p degrees, the value range of a3 is as follows: (0.77-0.84). Times.180/p DEG, wherein p is the pole pair number of the motor.
In an alternative embodiment, in S4, the values of b1, b2 and b3 are in the range: 0 to 15 °, x11= (0.95 to 1.05) X12, x21= (0.95 to 1.05) X22, x31= (0.95 to 1.05) X32.
In an alternative embodiment, in S5, h1 is less than or equal to h2 is less than or equal to h3, and the value range of h3 is 3% -6.5% of the outer circle radius R2.
In an alternative embodiment, in S6, p1 is less than or equal to p2 is 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 d1, d2, d3, d4 and d5 are 0, no reinforcing rib is indicated, and the grooves on the two sides are communicated.
In an alternative embodiment, in S7, the distance from the cavity boundary of the permanent magnet in M21 to the Q2 point is f2, and the cavity width is y21; the distance from the boundary of the cavity of the permanent magnet in M31 to the point Q3 is f3, and the width of the cavity is y31; y21 and y31 taken to 0 indicate that there is no permanent magnet in the cavity.
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 is c2; all the permanent magnet grooves are not interfered with each other and are positioned in the area between the arc L3 and the inner circle of the rotor punching sheet; the average gap between the permanent magnet and the cavity is e1.
In an alternative embodiment, in S7, the value range of c1 is: the value range of c2 is 1 mm-3 mm: the value range of the E1 is 0.5 mm-2 mm: 0.1 mm-0.2 mm.
The design method of the four-six-eight-pole motor rotor punching sheet provided by the embodiment of the invention has the beneficial effects that:
1. the invention combines the characteristics of cage type asynchronous motor, synchronous reluctance motor and permanent magnet synchronous motor, the drawn punched sheet can be added with bolt holes or rivet holes and other fixed structures to be overlapped into a rotor core, and aluminum casting is injected into a squirrel cage groove through an aluminum casting process to form a squirrel cage for starting and damping, and then permanent magnets are inserted into a permanent magnet groove to form a rotor of the self-starting permanent magnet motor;
2. the rotor manufactured by the punching sheet drawn by the invention has the same multi-layer magnetic barrier as the synchronous reluctance motor, the rotor has larger salient pole ratio, the formed permanent magnet synchronous motor has larger proportion of reluctance torque, and the proportion of the permanent magnet torque to the total torque is reduced, 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 the punching sheet drawn by the invention has the advantages that the magnetic density is reduced due to the reduction of the permanent magnet consumption, the iron consumption is reduced, and the rated load and the efficiency in low load are improved;
4. the permanent magnet synchronous motor manufactured by the punching sheet drawn by the invention adopts a quadrilateral shape instead of a cage-like asynchronous motor rotor groove shape, and the formed cage groove is the extension of a magnetic barrier groove, so that the torque fluctuation is smaller when the cogging torque and the load are not carried.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIGS. 1-4 are schematic structural diagrams of a rotor sheet design process;
FIG. 5 is a schematic diagram of the stator and rotor laminations of a 280-4 permanent magnet synchronous motor;
FIG. 6 is a schematic diagram of a stator and rotor lamination of a 180-6 permanent magnet synchronous motor;
fig. 7 is a schematic structural view of stator and rotor laminations of a 355-8 permanent magnet synchronous motor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it 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, the hatched portion in fig. 1 to 4 is a cross section of cast aluminum or permanent magnet.
The embodiment provides a design method of a four-six-eight-pole motor rotor punching sheet, which comprises the following steps:
s1: one pole of the four-six-eight-pole motor rotor punching sheet is designed into three sectors, the unfolding angles of the three sectors are 90 degrees, 60 degrees and 45 degrees respectively, the rotor structure under one pole is symmetrical about a central axis 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 symmetry, one pole of the rotor sheet of the motor with 4, 6 and 8 poles is designed to be a sector with an unfolding angle of 90 °, 60 ° and 45 °, respectively, and the rotor structure under one pole is symmetric about the central axis ZX on both sides, the outer circle radius of the rotor sheet is R2, and the value range of the outer circle radius R2 is: 28 mm-250 mm, an inner circle radius Ri2, and a sector initial radial boundary X and Y, wherein p is the pole pair number of the motor, and the poles according to 4, 6 and 8 are respectively 2, 3 and 4.
S2: and (3) respectively shifting the distances of r1, r2 and r3 inwards from the outer circle of the rotor to obtain three arc baselines L1, L2 and L3.
Specifically, please refer to fig. 1, the distances r1, r2, r3 are respectively shifted inward from the outer circle of the rotor, so as to obtain three arc baselines L1, L2, L3. r1 and r3 are the widths of the magnetism isolating bridge, and the value range is as follows: the value range of R2 is 10-15% of the radius R2 of the outer circle, and the range is 0.5-3 mm.
S3: 3 pairs of rays which pass through the circle center and are symmetrical about the central axis ZX are drawn, the unfolding angles among the 3 pairs of rays are respectively a1, a2 and a3, and the intersection points of the rays on the side of the central axis ZX and L1 are respectively P1, P2 and P3.
Specifically, please refer to fig. 1, 3 pairs of rays passing through the center of the circle and symmetric about the center line ZX are drawn, the angles of expansion between the 3 pairs of rays are a1, a2 and a3, respectively, and the range of values of a1 is as follows: (0.27-0.35). Times.180/p DEG, the value range of a2 is as follows: (0.52-0.60). Times.180/p degrees, the value range of a3 is as follows: (0.77-0.84). Times.180/p DEG, wherein p is the pole pair number of the motor. The intersection points of the ray on the side of the central line and L1 are P1, P2 and P3 respectively.
S4: 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, 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 the arc L3 and the inner circle of the rotor punching sheet, and straight lines perpendicular to the ZX axis through three points Q1, Q2 and Q3 are LQ1, LQ2 and LQ3 respectively.
Specifically, please refer to fig. 1 and 2, straight lines LL1, LL2 and LL3 are drawn through P1, P2 and P3, respectively. The 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: 0-15 deg..
Three points Q1, Q2, and Q3 are found on LL1, LL2, and LL3, respectively, such that x11= (0.95-1.05) X12, x21= (0.95-1.05) X22, x31= (0.95-1.05) X32, and such that three points Q1, Q2, and Q3 are located in the area between the arc L3 and the inner circle of the rotor sheet; straight lines perpendicular to the ZX axis passing through three points Q1, Q2 and Q3 are LQ1, LQ2 and LQ3, respectively.
S5: parallel lines LM1, LM2 and LM3, in which LL1, LL2 and LL3 are offset in the Y-axis direction, are drawn, LL1, LM1, L1 and L2 enclose a cage groove C1, LL2, LM2, L1 and L2 enclose a cage groove C2, and LL3, LM3, L1 and L2 enclose a cage groove C3.
Specifically, please refer to fig. 1-3, parallel lines LM1, LM2 and LM3 of LL1, LL2 and LL3 offset in the Y-axis direction are drawn, the offset distances are h1, h2 and h3, h1 is less than or equal to h2 and less than or equal to h3, and the value range of h3 is 3% -6.5% of the outer circle radius R2.
LL1, LL2 and LL3 enclose squirrel cage slot C1, LM2 enclose squirrel cage slot C2, L1, L2 and LM3 enclose squirrel cage slot C3.
S6: parallel lines LN2 and LN3 in which LL2 and LL3 are shifted in the Y-axis direction are drawn, parallel lines LP1, LP2 and LP3 in which LQ1, LQ2 and LQ3 are shifted in the center direction are drawn, and reinforcing ribs d1, d2, d3, d4 and d5 are arranged, d1, d3 and d5 are located at the center axis, d2 is located on the side of the Q2 point near the Y-axis, and d4 is located on the side of the Q3 point near the Y-axis.
Specifically, please refer to fig. 1 to 3, parallel lines LN2 and LN3 of LL2 and LL3 offset in the Y-axis direction are drawn, and the offset distances are p2 and p3, respectively; drawing parallel lines LP1, LP2 and LP3 of LQ1, LQ2 and LQ3 which are offset towards the circle center direction, wherein the offset distances are p1, p2 and p3 respectively; p1 is more than or equal to p2 and less than or equal to p3, and the value range of p3 is 2% -4% of the radius R2 of the outer circle; and the reinforcing ribs d1, d2, d3, d4 and d5 are arranged, the d1, d3 and d5 are positioned at the central axis, the d2 is positioned at the side of the Q2 point close to the Y axis, and the d4 is positioned at the side of the Q3 point close to the Y axis. The values of d1, d2, d3, d4 and d5 are as follows: 0-3 mm; when d1, d2, d3, d4 and d5 are taken as 0, no reinforcing rib is indicated, and the grooves on the two sides are communicated.
S7: the L3, LL1, LL2, LL3, LM1, LM2, LM3, LN2, LN3, LQ1, LQ2, LQ3, LP1, LP2 and LP3, and the reinforcing ribs respectively enclose 5 permanent magnet slots M1, M21, M22, M31, M32, and a cavity for placing the rectangular permanent magnets is formed by positioning steps.
Specifically, please refer to fig. 1 to 4, the cavities for placing the rectangular permanent magnets are formed by L3, LL1, LL2, LL3, LM1, LM2, LM3, LN2, LN3, LQ1, LQ2, LQ3, LP1, LP2, and LP3, and the reinforcing ribs respectively enclosing M1, M21, M22, M31, M325 permanent magnet slots M1, M21, M22, M31, M32, and by positioning steps; the distance from the boundary of the cavity of the permanent magnet in M21 to the point Q2 is f2, and the width of the cavity is y21; the distance from the boundary of the cavity of the permanent magnet in M31 to the point Q3 is f3, and the width of the cavity is y31; y21 and y31 when taken to 0 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: the value range of c2 is 1 mm-3 mm: 0.5 mm-2 mm; all the permanent magnet grooves are not interfered with each other and are positioned in the area between the arc L3 and the inner circle of the rotor punching sheet; the average clearance 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 numbers of permanent magnet slots and squirrel cage slots in the above description also refer to slots that are symmetrical about ZX.
Taking a permanent magnet synchronous motor 280-4 (base 280, pole number 4) as an example, the design parameters are shown in table 1, and the structure of the rotor punching sheet is shown in fig. 5.
Design parameters of tables 1 280-4
Since there is no reinforcing rib (width of 0) between M1 and its symmetrical slot, M1 and its symmetrical slot are combined into one slot. The symmetrical grooves are symmetrical grooves about the central axis ZX.
Another permanent magnet synchronous motor 180-6 (base number 180, pole number 6) is exemplified, its design parameters are shown in table 2, and the structure of the rotor sheet is shown in fig. 6.
TABLE 2 180-6 rotor sheet design parameters
Since there is no rib (width of 0) between M1 and its symmetrical slot, M22 and its symmetrical slot, and M32 and its symmetrical slot, the rotor sheet is so that M1 and its symmetrical slot are combined into one slot, M22 and its symmetrical slot are combined into one slot, and M32 and its symmetrical slot are combined into one slot. The symmetrical grooves are symmetrical grooves about the central axis ZX.
Another permanent magnet synchronous motor 355-8 (base 355, pole number 8) is exemplified, the design parameters are shown in table 3, and the structure of the rotor sheet is shown in fig. 7.
Design parameters of tables 3 355-8
The rotor punching sheet is formed by punching a silicon steel sheet, and a permanent magnet in the rotor is made of neodymium iron boron or ferrite permanent magnet material by lamination. The permanent magnet synchronous motor adopting the punching sheet achieves IE5 efficiency, and reduces the dosage of the permanent magnet.
The design method of the four-six-eight-pole motor rotor punching sheet provided by the embodiment of the invention has the beneficial effects that:
1. the invention combines the characteristics of cage type asynchronous motor, synchronous reluctance motor and permanent magnet synchronous motor, the drawn punched sheet can be added with bolt holes or rivet holes and other fixed structures to be overlapped into a rotor core, and aluminum casting is injected into a squirrel cage groove through an aluminum casting process to form a squirrel cage for starting and damping, and then permanent magnets are inserted into a permanent magnet groove to form a rotor of the self-starting permanent magnet motor;
2. the rotor manufactured by the punching sheet drawn by the invention has the same multi-layer magnetic barrier as the synchronous reluctance motor, the rotor has larger salient pole ratio, the formed permanent magnet synchronous motor has larger proportion of reluctance torque, and the proportion of the permanent magnet torque to the total torque is reduced, 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 the punching sheet drawn by the invention has the advantages that the magnetic density is reduced due to the reduction of the permanent magnet consumption, the iron consumption is reduced, and the rated load and the efficiency in low load are improved;
4. the permanent magnet synchronous motor manufactured by the punching sheet drawn by the invention adopts a quadrilateral shape instead of a cage-like asynchronous motor rotor groove shape, and the formed cage groove is the extension of a magnetic barrier groove, so that the torque fluctuation is smaller when the cogging torque and the load are not carried.
The present invention is not limited to the above embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. The design method of the four-six-eight-pole motor rotor punching sheet is characterized by comprising the following steps of:
s1: designing one pole of the four-six-eight-pole motor rotor punching sheet into three sectors, wherein the unfolding angles of the three sectors are 90 degrees, 60 degrees and 45 degrees respectively, the rotor structure under one pole is symmetrical about a central axis ZX, and the outer circle radius of the four-six-eight-pole motor rotor punching sheet is R2;
s2: the distances of r1, r2 and r3 are respectively offset inwards from the outer circle of the rotor, so that three arc baselines L1, L2 and L3 are obtained;
s3: drawing 3 pairs of rays which pass through the circle center and are symmetrical about a central axis ZX, wherein the unfolding angles between 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 the LL1, LL2 and LL3 and a boundary Y are b1, b2 and b3 respectively, and searching three points Q1, Q2 and Q3 on the LL1, LL2 and LL3 respectively, so that the Q1, Q2 and Q3 are positioned in a region between an arc L3 and the inner circle of a rotor punching sheet, and straight lines perpendicular to the ZX axis through the three points Q1, Q2 and Q3 are LQ1, LQ2 and LQ3 respectively;
s5: drawing parallel lines LM1, LM2 and LM3 of LL1, LL2 and LL3 which are offset towards the Y-axis direction, wherein the offset distances are h1, h2 and h3 respectively, LL1, LM1, L1 and L2 enclose a squirrel cage groove C1, LL2, LM2, L1 and L2 enclose a squirrel cage groove C2, and LL3, LM3, L1 and L2 enclose a squirrel cage groove C3;
s6: drawing parallel lines LN2 and LN3 of LL2 and LL3 which are offset towards the Y axis, drawing parallel lines LP1, LP2 and LP3 of LQ1, LQ2 and LQ3 which are offset towards the circle center, wherein the offset distances are p1, p2 and p3 respectively, reinforcing ribs d1, d2, d3, d4 and d5 are arranged, d1, d3 and d5 are positioned at the central axis, d2 is positioned on one side of the Q2 point close to the Y axis, and d4 is positioned on one side of the Q3 point close to the Y axis;
s7: 5 permanent magnet slots M1, M21, M22, M31, M32 are respectively surrounded by L3, LL1, LL2, LL3, LM1, LM2, LM3, LN2, LN3, LQ1, LQ2, LQ3, LP1, LP2 and LP3 and reinforcing ribs.
2. The method for designing a rotor punching sheet of a four-six-eight-pole motor according to claim 1, wherein in S1, the value range of the outer circle radius R2 is: 28 mm-250 mm.
3. The method for designing a rotor punching sheet of a four-six-eight pole motor according to claim 1, wherein in S2, r1 and r3 are widths of a magnetism isolating bridge, and the range of values is: the value range of R2 is 10-15% of the radius R2 of the outer circle, and the range is 0.5-3 mm.
4. The method for designing a rotor punching sheet for a four-six-eight pole motor according to claim 1, wherein in S3, the value range of a1 is: (0.27-0.35). Times.180/p DEG, the value range of a2 is as follows: (0.52-0.60). Times.180/p degrees, the value range of a3 is as follows: (0.77-0.84). Times.180/p DEG, wherein p is the pole pair number of the motor.
5. The method for designing a rotor punching sheet for a four-six-eight pole motor according to claim 1, wherein in S4, the range of values of b1, b2 and b3 is: 0 to 15 °, x11= (0.95 to 1.05) X12, x21= (0.95 to 1.05) X22, x31= (0.95 to 1.05) X32.
6. The method for designing a rotor punching sheet of a four-six-eight pole motor according to claim 1, wherein in the S5, h1 is less than or equal to h2 and less than or equal to h3, and the value range of h3 is 3% -6.5% of the outer circle radius R2.
7. The method for designing a rotor punching sheet of a four-six-eight pole motor according to claim 1, wherein in S6, p1 is equal to or more than p2 is equal to or less than 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 d1, d2, d3, d4 and d5 are 0, no reinforcing rib is indicated, and the grooves on the two sides are communicated.
8. The method for designing a rotor punching sheet of a four-six-eight pole motor according to claim 1, wherein in S7, the distance from the boundary of the M21 inner permanent magnet cavity to the Q2 point is f2, and the cavity width is y21; the distance from the boundary of the cavity of the permanent magnet in M31 to the point Q3 is f3, and the width of the cavity is y31; y21 and y31 taken to 0 indicate that there is no permanent magnet in the cavity.
9. The method for designing a rotor punching sheet for a four-six-eight pole motor according to claim 8, wherein in S7, 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 is c2; all the permanent magnet grooves are not interfered with each other and are positioned in the area between the arc L3 and the inner circle of the rotor punching sheet; the average gap between the permanent magnet and the cavity is e1.
10. The method for designing a rotor punching sheet for a four-six-eight pole motor according to claim 9, wherein in S7, the value range of c1 is: the value range of c2 is 1 mm-3 mm: the value range of the E1 is 0.5 mm-2 mm: 0.1 mm-0.2 mm.
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|---|---|---|---|---|
| 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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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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