CN114640226B - Design method of dipolar motor rotor punching sheet - Google Patents
Design method of dipolar motor rotor punching sheet Download PDFInfo
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- CN114640226B CN114640226B CN202210223529.4A CN202210223529A CN114640226B CN 114640226 B CN114640226 B CN 114640226B CN 202210223529 A CN202210223529 A CN 202210223529A CN 114640226 B CN114640226 B CN 114640226B
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- 238000004080 punching Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 20
- 241000555745 Sciuridae Species 0.000 claims abstract description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 15
- 230000005389 magnetism Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 7
- 230000001360 synchronised effect Effects 0.000 description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 239000003351 stiffener Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- -1 neodymium iron boron rare earth Chemical class 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
-
- 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
- H02K21/022—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator
- H02K21/025—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator by varying the thickness of the air gap between field and armature
-
- 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
Abstract
The invention provides a design method of a rotor punching sheet of a dipolar motor, and relates to the technical field of motors. The design method of the rotor punching sheet of the dipolar motor comprises the following steps: s1: designing one pole of a rotor punching sheet of the two-pole motor into two semicircles, wherein each semicircle is symmetrical about a Y axis; s2: the distances of r1, r2 and r3 are respectively offset inwards from the outer circle of the rotor, so that three semicircular arc baselines L1, L2 and L3 are obtained; s3: drawing 8 squirrel cage grooves of C1, C2, C3, C4, C5, C6, C7 and C8 or 3 squirrel cage grooves of C3, C5 and C7, wherein the squirrel cage grooves consist of areas surrounded by four boundary lines of upper, lower, left and right; s4: and (3) drawing three layers of permanent magnet grooves by taking P1, P2 and P3 as positioning points and taking the intersection points of the L3 and the extension lines of radial boundary lines of the sides of the C3, the C5 and the C7 close to the Y axis as the positioning points. The method reduces the consumption of permanent magnet materials, thereby reducing the total cost of the motor.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a design method of a dipolar 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 dipolar motor rotor punching sheet, which can reduce the consumption of permanent magnet materials and further reduce the total cost of a motor.
Embodiments of the invention may be implemented as follows:
the invention provides a design method of a rotor punching sheet of a dipolar motor, which comprises the following steps:
s1: designing one pole of the two-pole motor rotor punching sheet into two semicircles, wherein the two semicircles are symmetrical about a Y axis, and the outer circle radius of the two-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 semicircular arc baselines L1, L2 and L3 are obtained;
s3: drawing 8 squirrel cage grooves in total of C1, C2, C3, C4, C5, C6, C7 and C8 or 3 squirrel cage grooves in total of C3, C5 and C7, wherein the squirrel cage grooves are formed by areas surrounded by four boundary lines of upper boundary line, lower boundary line, left boundary line and right boundary line, L1 and L2 are arranged on the upper boundary line and the lower boundary line, and the left boundary line and the right boundary line are radial transmitting lines passing through the center of a rotor;
s4: and (3) drawing three layers of permanent magnet grooves or two layers of permanent magnet grooves by taking P1, P2 and P3 as positioning points and respectively taking the intersection points of the L3 and the extension lines of the radial boundary lines of the sides of the C3, the C5 and the C7 close to the Y axis as P1, P2 and P3, and inserting rectangular permanent magnets into the permanent magnet grooves.
In an alternative embodiment, in S1, the value range of the outer circle radius R2 is: 24 mm-180 mm.
In an alternative embodiment, in S2, r1 and r3 are widths of the magnetic isolation 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.
In an alternative embodiment, in S3, the angle between the left and right boundary lines of each cage groove is aw, and the value of aw ranges from 3 ° to 6 °.
In an alternative embodiment, in S3, the angle between the boundary line of C3 near the center line and the boundary line of the Y-axis symmetric position is a1, and the range of values of a1 is: (0.29-0.32). Times.180 DEG, the angle between the boundary line of C5 near the center line and the boundary line of the Y-axis symmetrical position is a2, and the value range of a2 is: (0.56 to 0.59) ×180°, wherein the angle between the boundary line of C7 on the side close to the Y axis and the boundary line at the Y axis symmetrical position is a3, and the value range of a3 is: (0.79-0.82). Times.180 deg..
In an alternative embodiment, in S3, the angle between the corresponding radial boundary lines of C1 and C2 is ax1, the angle between the corresponding radial boundary lines of C2 and C3 is ax2, the angle between the corresponding radial boundary lines of C4 and C5 is ax3, the angle between the corresponding radial boundary lines of C6 and C7 is ax4, the radial center line of C8 is located on the X axis and the-X axis, and the range of values of ax1 to ax4 is: 10-12.5 degrees.
In an alternative embodiment, in S4, the first layer of the three-layer permanent magnet slot is M1, the second layer is M21 and M22, the third layer is M31 and M32, the two-layer permanent magnet slot includes the second layer M21 and M22, and the third layer M31 and M32, the thicknesses of the three layers are h1, h2 and h3, h1 is less than or equal to h2 is less than or equal to h3, the M21 and M22 are aligned in parallel and are separated by a reinforcing rib with a width d2, and the value range of d2 is: 0-3 mm, M31 and M32 are aligned in parallel, the middle is separated by a reinforcing rib with the width of d4, and the value range of d4 is as follows: 0-3 mm.
In the optional embodiment, in S4, h1 is not less than 1.2mm, h3 is 4% -6.5% of the outer circle radius R2, and the upper long side and the lower long side of each permanent magnet groove are parallel to each other; the included angles between the long sides of the three-layer permanent magnet grooves and the X axis are b1, b2 and b3, and the value ranges of b1, b2 and b3 are 0-30 degrees respectively; the left side boundaries of the three permanent magnet grooves M1, M21 and M31 are not more than the extension lines of radial boundary lines of the sides of C3, C5 and C7 far away from the Y axis; the widths of the reinforcing ribs between the M1, M22 and M32 and the permanent magnet grooves symmetrical along the Y axis are d1, d3 and d5, and the values of d1, d3 and d5 are as follows: 0-3 mm.
In an alternative embodiment, in S4, the widths of the permanent magnets inserted into the M1, M21, M22, M31, M32 are y1, y21, y22, y31, y32, respectively, the width of the raised step of the permanent magnet for clamping is c1, the height is c2, and the value range of c1 is: 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; the average gap between the permanent magnet grooves and the permanent magnets is e1, and the value range of e1 is as follows: 0.1 mm-0.2 mm.
In an alternative embodiment, in S4, the included angle between the reinforcing ribs between M31 and M32 and the Y axis is b4, and the value range of b4 is: 0-15 degrees; d1, d2, d3, d4 and d5 have values of 0, which indicate that no reinforcing rib exists and the grooves on two sides are communicated; y21 is the same as y22, and y31 is the same as y 32.
The design method of the dipolar 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 to form a rotor core, 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 is drawn by the method, and the squirrel-cage slot is not similar to the rotor slot of the cage asynchronous motor, but is similar to the trapezoid slot, so that the formed squirrel-cage slot is the extension of the magnetic barrier slot, and 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. 1-3 are schematic structural diagrams of a rotor sheet design process;
FIG. 4 is a schematic diagram of the structure of the stator and rotor laminations of an 80-2 permanent magnet synchronous motor;
fig. 5 is a schematic structural view of stator and rotor laminations of a 355-2 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.
The embodiment provides a design method of a rotor punching sheet of a two-pole motor, which comprises the following steps:
s1: and designing one pole of the two-pole motor rotor punching sheet into two semicircles, wherein the two semicircles are symmetrical about a Y axis, and the radius of the outer circle of the two-pole motor rotor punching sheet is R2.
Specifically, please refer to fig. 1, according to symmetry, a design is performed according to one pole of the rotor punching sheet of the two-pole motor, which is a semicircle of the first quadrant and the second quadrant, and the rotor structure under one pole is bilaterally symmetrical about the Y axis, the outer circle radius of the rotor punching sheet is R2, and the value range of the outer circle radius R2 is: 24 mm-180 mm, and the inner circle radius is Ri2.
S2: and respectively shifting the distances of r1, r2 and r3 inwards from the outer circle of the rotor to obtain three semicircular arc baselines L1, L2 and L3.
Specifically, distances r1, r2 and r3 are respectively offset inwards from the outer circle of the rotor, so that three semicircular base lines L1, L2 and L3 are obtained. 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: and drawing 8 squirrel cage grooves, wherein the squirrel cage grooves are formed by an area surrounded by an upper boundary line, a lower boundary line, a left boundary line and a right boundary line, the upper boundary line and the lower boundary line are L1 and L2, the left boundary line and the right boundary line are radial transmitting lines passing through the center of a rotor, and the C1, the C2, the C4, the C6 and the C8 can be independently selected and not drawn, so that 3 squirrel cage grooves are drawn.
Specifically, 8 squirrel cage grooves are drawn, namely C1, C2, C3, C4, C5, C6, C7 and C8 are filled with cast aluminum during rotor manufacturing. The squirrel cage grooves are formed by areas surrounded by an upper boundary line, a lower boundary line, a left boundary line and a right boundary line, the upper boundary line and the lower boundary line are L1 and L2, the left boundary line and the right boundary line are radial emission lines passing through the circle center of the rotor, the angle between the left boundary line and the right boundary line of each groove is aw, and the value range of aw is 3-6 degrees.
The angle between the boundary line of the side close to the center line of C3 and the boundary line of the Y-axis symmetrical position is a1, and the value range of a1 is as follows: (0.29-0.32). Times.180 DEG, the angle between the boundary line of C5 near the center line and the boundary line of the Y-axis symmetrical position is a2, and the value range of a2 is: (0.56 to 0.59) ×180°, wherein the angle between the boundary line of C7 on the side close to the Y axis and the boundary line at the Y axis symmetrical position is a3, and the value range of a3 is: (0.79-0.82). Times.180 deg..
The angle between corresponding radial boundary lines of C1 and C2 is ax1, the angle between corresponding radial boundary lines of C2 and C3 is ax2, the angle between corresponding radial boundary lines of C4 and C5 is ax4, the radial center line of C8 is positioned on an X axis and an X axis, and the range of values of ax1 to ax4 is: 10-12.5 degrees.
S4: and (3) respectively taking the intersection points of the L3 and the extension lines of the radial boundary lines of the C3, C5 and C7, which are close to one side of the Y axis, as P1, P2 and P3, taking the P1, P2 and P3 as positioning, drawing three layers of permanent magnet grooves, and inserting rectangular permanent magnets into the permanent magnet grooves.
Specifically, referring to fig. 1 to 3, the first layer of the three-layer permanent magnet slot is M1, the second layer is M21 and M22, the third layer is M31 and M32, the thicknesses of the three layers are h1, h2 and h3, h1 is not less than h2 and not more than h3, the M21 and M22 are aligned in parallel and are separated by a reinforcing rib with a width d2, and the value range of d2 is as follows: 0-3 mm, M31 and M32 are aligned in parallel, the middle is separated by a reinforcing rib with the width of d4, and the value range of d4 is as follows: 0-3 mm, wherein M1 can be selected from the drawing, so that only two layers of permanent magnet grooves are drawn.
h1 is not less than 1.2mm, h3 is 4% -6.5% of the radius R22 of the outer circle, and the upper long side and the lower long side of each permanent magnet groove are parallel to each other; the included angles between the long sides of the three-layer permanent magnet grooves and the X axis are b1, b2 and b3, and the value ranges of b1, b2 and b3 are 0-30 degrees respectively; the left side boundaries of the three permanent magnet grooves M1, M21 and M31 are not more than the extension lines of radial boundary lines of the sides of C3, C5 and C7 far away from the Y axis; the widths of the reinforcing ribs between the M1, M22 and M32 and the permanent magnet grooves symmetrical along the Y axis are d1, d3 and d5, and the values of d1, d3 and d5 are as follows: 0-3 mm.
The widths of the permanent magnets inserted into the M1, M21, M22, M31 and M32 are y1, y21, y22, y31 and y32 respectively, the width of the raised step of the permanent magnet for clamping 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; the average gap between the permanent magnet grooves and the permanent magnets is e1, and the value range of e1 is as follows: 0.1 mm-0.2 mm.
The included angle between the reinforcing rib between M31 and M32 and the Y axis is b4, and the value range of b4 is as follows: 0-15 degrees; when the values of d1, d2, d3, d4 and d5 are 0, no reinforcing ribs are shown, the groove shapes on two sides are communicated, so that the y21 and the y22 can be the same, and the y31 and the y32 can be the same for saving the specification of the permanent magnet; when the starting or damping capacity is sufficient, M1 can be selected not to be drawn so as to reduce the number of squirrel cage grooves.
Taking a permanent magnet synchronous motor 80-2 (base number 80, pole number 2) as an example, the design parameters are shown in table 1, and stator and rotor punching sheets are shown in fig. 4.
TABLE 1 80-2 rotor sheet design parameters
| R2 | Ri2 | r1 | r2 | r3 | aw | a1 |
| 35.67 | 13 | 0.8 | 4.8 | 1.2 | 5° | 0.311×180° |
| a2 | a3 | ax1 | ax2 | ax3 | ax4 | d1 |
| 0.587×180° | 0.807×180° | 11° | 11° | 12.4 | - | - |
| d2 | d3 | d4 | d5 | b1 | b2 | b3 |
| 0 | 0 | 0 | 0 | - | 15.57° | 20.57° |
| b4 | h1 | h2 | h3 | y1 | y21 | y22 |
| - | - | 1.8 | 1.8 | - | 9.78 | 9.78 |
| y31 | y32 | c1 | c2 | e1 | - | - |
| 12.24 | 12.24 | 1.5 | 0.7 | 0.1 | - | - |
The sheet was free of C6, C8, M1, M21 and M22 combined as one slot because of the absence of intermediate stiffeners (width 0), and M31 and M32 combined as one slot because of the absence of intermediate stiffeners (width 0).
Another permanent magnet synchronous motor 355-2 (base 355, pole number 2) is exemplified, its design parameters are shown in table 2, and its stator and rotor sheets are shown in fig. 5.
TABLE 2 355-2 rotor sheet design parameters
| R2 | Ri2 | r1 | r2 | r3 | aw | a1 |
| 161.1 | 55 | 1.5 | 22 | 2.6 | 3.9° | 0.313×180° |
| a2 | a3 | ax1 | ax2 | ax3 | ax4 | d1 |
| 0.563×180° | 0.813×180° | 11.25° | 11.25° | 11.25 | 11.25 | 2.6 |
| d2 | d3 | d4 | d5 | b1 | b2 | b3 |
| 2.67 | 2.6 | 3 | 2.6 | 15 | 18° | 18° |
| b4 | h1 | h2 | h3 | y1 | y21 | y22 |
| 10 | 6.8 | 6.8 | 6.8 | 58.42 | 47.80 | 47.80 |
| y31 | y32 | c1 | c2 | e1 | - | - |
| 60.00 | 60.00 | 2 | 1.5 | 0.15 | - | - |
The punched sheet is free of C8.
The 80-2 and 355-2 punching sheets are all formed by punching silicon steel sheets, and the permanent magnets in the rotor are made of neodymium iron boron or ferrite permanent magnet materials by lamination. The efficiency of the permanent magnet synchronous motor adopting the punching sheet is improved, and the dosage of the permanent magnet is reduced.
The design method of the dipolar 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 to form a rotor core, 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 is drawn by the method, and the squirrel-cage slot is not similar to the rotor slot of the cage asynchronous motor, but is similar to the trapezoid slot, so that the formed squirrel-cage slot is the extension of the magnetic barrier slot, and the torque fluctuation is smaller when the cogging torque and the load are not carried.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The design method of the rotor punching sheet of the two-pole motor is characterized by comprising the following steps of:
s1: designing one pole of the two-pole motor rotor punching sheet into two semicircles, wherein the two semicircles are symmetrical about a Y axis, and the radius of the outer circle of the two-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, three semicircular arc baselines L1, L2 and L3 are obtained, and the r1 and r3 are the widths of the magnetism isolating bridge, and the value ranges are 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: drawing 8 squirrel cage grooves or 3 squirrel cage grooves of C1, C2, C3, C4, C5, C6, C7 and C8, wherein the squirrel cage grooves consist of an area surrounded by an upper boundary line, a lower boundary line, a left boundary line and a right boundary line, the upper boundary line, the lower boundary line and the left boundary line are L1 and L2, the left boundary line and the right boundary line are radial emission lines passing through the center of a rotor, the angle between the left boundary line and the right boundary line of each squirrel cage groove is aw, the value range of aw is 3-6 degrees, the angle between the boundary line of one side of the C3, which is close to the center line, and the boundary line of the Y-axis symmetrical position of the boundary line is a1, and the value range of a1 is: (0.29-0.32). Times.180 DEG, the angle between the boundary line of C5 near the center line and the boundary line of the Y-axis symmetrical position is a2, and the value range of a2 is: (0.56 to 0.59) ×180°, wherein the angle between the boundary line of C7 on the side close to the Y axis and the boundary line at the Y axis symmetrical position is a3, and the value range of a3 is: (0.79-0.82) ×180°, an angle between corresponding radial boundary lines of C1 and C2 being ax1, an angle between corresponding radial boundary lines of C2 and C3 being ax2, an angle between corresponding radial boundary lines of C4 and C5 being ax3, an angle between corresponding radial boundary lines of C6 and C7 being ax4, a radial center line of C8 being located on the X-axis and the-X-axis, the values of ax1 to ax4 being in the range: 10-12.5 degrees;
s4: the intersection point of an extension line of a radial boundary line of one side of C3, C5 and C7, which is close to a Y axis, and L3 is P1, P2 and P3 respectively, and P1, P2 and P3 are used for positioning, three layers of permanent magnet grooves or two layers of permanent magnet grooves are drawn, rectangular permanent magnets are inserted into the permanent magnet grooves, a first layer of each three layers of permanent magnet groove is M1, a second layer of each three layers of permanent magnet grooves is M21 and M22, a third layer of each three layers of permanent magnet groove is M31 and M32, the two layers of permanent magnet grooves comprise second layers M21 and M22 and third layers M31 and M32, the thicknesses of the three layers of permanent magnet grooves are h1, h2 and h3 respectively, h1 is less than or equal to h2 and less than or equal to h3, the M21 and M22 are aligned in parallel, reinforcing ribs with the width d2 are arranged in the middle, and the value range of d2 is as follows: 0-3 mm, M31 and M32 are aligned in parallel, the middle is separated by a reinforcing rib with the width of d4, and the value range of d4 is as follows: 0-3 mm.
2. The method for designing a rotor punching sheet of a two-pole motor according to claim 1, wherein in S1, the value range of the outer circle radius R2 is: 24 mm-180 mm.
3. The design method of the dipolar motor rotor punching sheet according to claim 1, wherein in the step S4, h1 is not less than 1.2mm, h3 is 4% -6.5% of the outer circle radius R2, and the upper long side and the lower long side of each permanent magnet groove are parallel to each other; the included angles between the long sides of the three-layer permanent magnet grooves and the X axis are b1, b2 and b3, and the value ranges of b1, b2 and b3 are 0-30 degrees respectively; the left side boundaries of the three permanent magnet grooves M1, M21 and M31 are not more than the extension lines of radial boundary lines of the sides of C3, C5 and C7 far away from the Y axis; the widths of the reinforcing ribs between the M1, M22 and M32 and the permanent magnet grooves symmetrical along the Y axis are d1, d3 and d5, and the values of d1, d3 and d5 are as follows: 0-3 mm.
4. The method for designing a rotor punching sheet of a two-pole motor according to claim 3, wherein in S4, the widths of the permanent magnets inserted into the M1, M21, M22, M31, M32 are y1, y21, y22, y31, y32, respectively, the widths of the raised steps of the permanent magnets for clamping are c1, the heights are c2, and the values of c1 are: 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; the average gap between the permanent magnet grooves and the permanent magnets is e1, and the value range of e1 is as follows: 0.1 mm-0.2 mm.
5. The method of claim 4, wherein in S4, an included angle between the Y axis and the reinforcing rib between M31 and M32 is b4, and a value range of b4 is: 0-15 degrees; d1, d2, d3, d4 and d5 have values of 0, which indicate that no reinforcing rib exists and the grooves on two sides are communicated; y21 is the same as y22, and y31 is the same as y 32.
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