CN114640226A - Method for designing rotor punching sheet of dipolar motor - Google Patents
Method for designing rotor punching sheet of dipolar motor Download PDFInfo
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- CN114640226A CN114640226A CN202210223529.4A CN202210223529A CN114640226A CN 114640226 A CN114640226 A CN 114640226A CN 202210223529 A CN202210223529 A CN 202210223529A CN 114640226 A CN114640226 A CN 114640226A
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- 238000004080 punching Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000003014 reinforcing effect Effects 0.000 claims description 14
- 238000002955 isolation Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 7
- 230000001360 synchronised effect Effects 0.000 description 29
- 241000555745 Sciuridae Species 0.000 description 6
- 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
- 238000013016 damping Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000004907 flux Effects 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
- 230000009467 reduction Effects 0.000 description 2
- 239000010959 steel 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
- 238000004891 communication Methods 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
- 230000003993 interaction Effects 0.000 description 1
- 238000010030 laminating 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
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- 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
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a method for designing a rotor punching sheet of a two-pole motor, and relates to the technical field of motors. The method for designing the rotor punching sheet of the two-pole motor comprises the following steps: s1: designing one pole of a two-pole motor rotor punching sheet into two semicircles, wherein each semicircle is symmetrical about a Y axis; s2: respectively offsetting the distances of r1, r2 and r3 from the outer circle of the rotor inwards to obtain three semi-circular arc baselines L1, L2 and L3; s3: drawing 8 cage grooves of C1, C2, C3, C4, C5, C6, C7 and C8 or drawing 3 cage grooves of C3, C5 and C7, wherein the cage grooves are formed by areas surrounded by four boundary lines of upper, lower, left and right; s4: the intersections of the L3 and the extensions of the radial boundary lines of the C3, C5 and C7 close to the Y axis are respectively P1, P2 and P3, and the P1, P2 and P3 are used as positioning points to draw three layers of permanent magnet grooves. 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 method for designing a rotor punching sheet of a two-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 which pushes the motor rotor to rotate, so that the motor starts. 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 a rotor punching sheet of a two-pole motor, which can reduce the using amount of permanent magnet materials and further reduce the total cost of the motor.
Embodiments of the invention may be implemented as follows:
the invention provides a method for designing a rotor punching of a two-pole motor, which comprises the following steps:
s1: one pole of the two-pole motor rotor punching sheet is designed into two semicircles which are symmetrical about a Y axis, and the excircle radius of the two-pole motor rotor punching sheet is R2;
s2: respectively offsetting the distances of r1, r2 and r3 from the outer circle of the rotor inwards to obtain three semi-circular arc baselines L1, L2 and L3;
s3: drawing 8 cage grooves of C1, C2, C3, C4, C5, C6, C7 and C8 or drawing 3 cage grooves of C3, C5 and C7, wherein the cage grooves are formed by areas surrounded by four boundary lines, namely 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, and the left boundary line and the right boundary line are radial emitting lines passing through the center of a circle of the rotor;
s4: the intersection points of L3 and the extension lines of the radial boundary lines of the C3, the C5 and the C7 close to the Y axis are respectively P1, P2 and P3, the P1, the P2 and the P3 are used as positioning, three layers of permanent magnet grooves or two layers of permanent magnet grooves are drawn, and rectangular permanent magnets are inserted into the permanent magnet grooves.
In an alternative embodiment, in S1, the 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 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 alternative embodiment, in S3, the angle between the left and right boundary lines of each cage groove is aw, and aw ranges from 3 ° to 6 °.
In an alternative embodiment, in S3, the angle between the boundary line of the C3 on the side close to the center line and the boundary line of the Y-axis symmetric position thereof is a1, and a1 has a value range: (0.29-0.32) x 180 degrees, the angle between the boundary line of the C5 close to the center line side and the boundary line of the Y-axis symmetric position is a2, and the value range of a2 is as follows: (0.56-0.59) x 180 degrees, wherein the angle between the boundary line of the C7 close to the Y axis and the boundary line of the Y axis symmetric position is a3, and the value range of a3 is as follows: (0.79-0.82) x 180 degrees.
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 centerline of C8 is located on the X axis and the-X axis, and the ranges of ax1 to ax4 are: 10 to 12.5 degrees.
In an alternative embodiment, in S4, a first layer of three layers of permanent magnet slots is M1, a second layer is M21 and M22, and a third layer is M31 and M32, the two layers of permanent magnet slots include second layers M21 and M22, and third layers M31 and M32, the thicknesses of the three layers are h1, h2 and h3, respectively, h2 and M3 are not less than h1 and not more than h2, M21 and M22 are aligned in parallel and separated by a reinforcing rib with a width of d2, and the value range of d2 is: 0 ~ 3mm, M31 and M32 parallel alignment and the centre have the strengthening rib that width is d4 to separate, and the value range of d4 is: 0 to 3 mm.
In an optional embodiment, in S4, h1 is not less than 1.2mm, h3 is 4% -6.5% of the radius R2 of the outer circle, and the upper and lower long sides of each permanent magnet slot are parallel to each other; the included angles between the long sides of the three layers of permanent magnet grooves and the X axis are b1, b2 and b3 respectively, and the value ranges of b1, b2 and b3 are 0-30 degrees; the left boundaries of the three permanent magnet grooves M1, M21 and M31 do not exceed the extension lines of the 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 permanent magnet slots with M1, M22 and M32 and Y-axis symmetry are d1, d3 and d5, and the value ranges of the d1, d3 and d5 are as follows: 0 to 3 mm.
In an alternative embodiment, in S4, the widths of the permanent magnets inserted into M1, M21, M22, M31, and M32 are y1, y21, y22, y31, and y32, respectively, the width of the protruding step of the permanent magnet for blocking is c1, the height is c2, and the value range of c1 is: 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 located in the area between the arc line L3 and the inner circle; the average gap between the permanent magnet slot and the permanent magnet is e1, and the value range of e1 is as follows: 0.1 mm-0.2 mm.
In an alternative embodiment, in S4, an included angle between the reinforcing rib between M31 and M32 and the Y axis is b4, and a value range of b4 is: 0-15 degrees; when the values of d1, d2, d3, d4 and d5 are 0, no reinforcing rib is present, and the groove types at two sides are communicated; y21 is identical to y22 and y31 is identical to y 32.
The method for designing the rotor punching of the two-pole motor provided by the embodiment of the invention has the beneficial effects that:
1. the invention integrates the characteristics of a cage 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 the permanent magnet groove 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 of the invention has the advantages that the flux density is reduced due to the reduction of the use 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 drawing the stamped steel by the method adopts the trapezoid-like groove shape instead of the cage-like asynchronous motor rotor groove shape, 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 smaller.
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 3 are schematic structural diagrams of a rotor sheet design process;
FIG. 4 is a schematic structural diagram of a stator and a rotor sheet of the 80-2 permanent magnet synchronous motor;
fig. 5 is a schematic structural diagram of a stator and a rotor sheet of the 355-2 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.
The embodiment provides a method for designing a rotor punching sheet of a two-pole motor, which comprises the following steps:
s1: one pole of the two-pole motor rotor punching sheet is designed into two semicircles, the two semicircles are symmetrical about a Y axis, and the outer circle radius of the two-pole motor rotor punching sheet is R2.
Specifically, referring to fig. 1, according to symmetry, a pole of a two-pole motor rotor sheet is designed to be a semicircle of a first quadrant and a second quadrant, a rotor structure under the pole is symmetric about a Y axis, an outer radius of the rotor sheet is R2, and a value range of the outer radius R2 is: 24 mm-180 mm, and the radius of the inner circle is Ri 2.
S2: offset inward from the outer circle of the rotor by distances r1, r2, r3, respectively, three semi-circular arc baselines L1, L2, L3 are obtained.
Specifically, the three semi-circular arc baselines L1, L2, and L3 are offset inward from the outer circle of the rotor by distances r1, r2, and r3, respectively. 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 8 cage grooves including C1, C2, C3, C4, C5, C6, C7 and C8, wherein the cage grooves are all formed by regions enclosed by four boundary lines including 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 center of a rotor circle, and the C1, the C2, the C4, the C6 and the C8 can be independently selected and are not drawn, so that only 3 cage grooves including the C3, the C5 and the C7 are drawn.
Specifically, 8 cage grooves, C1, C2, C3, C4, C5, C6, C7, and C8, are drawn, and cast aluminum is filled in the cage grooves at the time of rotor manufacturing. The squirrel-cage grooves are formed by regions 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 center of a rotor circle, 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 symmetric position thereof is a1, and the value range of a1 is as follows: (0.29-0.32) x 180 degrees, the angle between the boundary line of the C5 close to the center line side and the boundary line of the Y-axis symmetric position is a2, and the value range of a2 is as follows: (0.56-0.59) x 180 degrees, wherein the angle between the boundary line of the C7 close to the Y axis and the boundary line of the Y axis symmetric position is a3, and the value range of a3 is as follows: (0.79-0.82) x 180 degrees.
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 centerline of C8 is located on the X-axis and the-X-axis, and the ranges of ax1 to ax4 are: 10 to 12.5 degrees.
S4: intersection points of L3 and extension lines of radial boundary lines of C3, C5 and C7 close to the Y axis are respectively P1, P2 and P3, and P1, P2 and P3 are used as positioning points to draw three layers of permanent magnet grooves, and rectangular permanent magnets are inserted into the permanent magnet grooves.
Specifically, referring to fig. 1 to 3, a first layer of the three layers of permanent magnet slots is M1, a second layer is M21 and M22, a third layer is M31 and M32, the thicknesses of the three layers are h1, h2 and h3 respectively, h2 is not less than h1 and not more than h3, M21 and M22 are aligned in parallel, and reinforcing ribs with a width of d2 are arranged in the middle of the three layers to separate, and the value range of d2 is as follows: 0 ~ 3mm, M31 and M32 parallel alignment and the centre have the strengthening rib that width is d4 to separate, and the value range of d4 is: 0-3 mm, wherein M1 can be selected not to be drawn, 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 excircle radius R22, and the upper and lower long edges of each permanent magnet slot are parallel to each other; the included angles between the long sides of the three layers of permanent magnet grooves and the X axis are b1, b2 and b3 respectively, and the value ranges of b1, b2 and b3 are 0-30 degrees; the left boundaries of the three permanent magnet grooves M1, M21 and M31 do not exceed the extension lines of the 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 permanent magnet slots with M1, M22 and M32 and Y-axis symmetry are d1, d3 and d5, and the value ranges of the d1, d3 and d5 are as follows: 0 to 3 mm.
The widths of the permanent magnets inserted into the M1, the M21, the M22, the M31 and the M32 are respectively y1, y21, y22, y31 and y32, the width of the convex step of the permanent magnet for clamping is c1, the height is c2, and the value range of the 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 located in the area between the arc line L3 and the inner circle; the average gap between the permanent magnet slot and the permanent magnet 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 to 15 degrees; when the values of d1, d2, d3, d4 and d5 are 0, no reinforcing rib is shown, the groove-shaped communication at two sides is realized in order to save the specification of the permanent magnet, y21 and y22 can be the same, and y31 and y32 can be the same; when the starting or damping capacity is sufficient, M1 can be selected not to draw so as to reduce the number of cage grooves.
Taking an 80-2 (machine base number 80, pole number 2) permanent magnet synchronous motor as an example, the design parameters are shown in table 1, and the stator and rotor punching sheets are shown in fig. 4.
TABLE 180-2 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 punching sheet does not have C6, C8 and M1, M21 and M22 are combined into a groove because no middle reinforcing rib (with the width of 0) is arranged, and M31 and M32 are also combined into a groove because no middle reinforcing rib (with the width of 0) is arranged.
Another 355-2 (with a machine base number of 355 and a pole number of 2) permanent magnet synchronous motor is taken as an example, the design parameters are shown in table 2, and the stator and rotor punching sheets are shown in fig. 5.
Table 2355-2 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 punch does not have C8.
The 80-2 punching sheet and the 355-2 punching sheet are both formed by punching silicon steel sheets, and permanent magnets in the rotor manufactured by laminating are made of neodymium iron boron or ferrite permanent magnet materials. The efficiency of the permanent magnet synchronous motor adopting the punching sheet is improved, and the using amount of the permanent magnet is reduced.
The method for designing the rotor punching of the two-pole motor provided by the embodiment of the invention has the beneficial effects that:
1. the invention integrates the characteristics of a cage 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 the permanent magnet groove 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 of the invention has the advantages that the flux density is reduced due to the reduction of the use 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 drawing the stamped steel by the method adopts the trapezoid-like groove shape instead of the cage-like asynchronous motor rotor groove shape, 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 smaller.
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 also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for designing a rotor punching of a two-pole motor is characterized by comprising 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 excircle radius of the two-pole motor rotor punching sheet is R2;
s2: respectively offsetting the distances of r1, r2 and r3 from the outer circle of the rotor inwards to obtain three semi-circular arc baselines L1, L2 and L3;
s3: drawing 8 cage grooves of C1, C2, C3, C4, C5, C6, C7 and C8 or 3 cage grooves of C3, C5 and C7, wherein the cage grooves are formed by areas surrounded by four boundary lines, namely 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, and the left boundary line and the right boundary line are radial emitting lines passing through the center of a rotor circle;
s4: the intersection points of L3 and the extension lines of the radial boundary lines of the C3, the C5 and the C7 close to the Y axis are respectively P1, P2 and P3, the P1, the P2 and the P3 are used as positioning, three layers of permanent magnet grooves or two layers of permanent magnet grooves are drawn, and rectangular permanent magnets are inserted into the permanent magnet grooves.
2. The method for designing the rotor sheet of the two-pole motor according to claim 1, wherein in S1, the value range of the outer circle radius R2 is as follows: 24 mm-180 mm.
3. The method for designing the rotor punching of the two-pole motor as claimed in claim 1, wherein 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.
4. The method for designing rotor sheets of a two-pole motor according to claim 1, wherein in S3, the angle between the left and right boundary lines of each cage groove is aw, and aw ranges from 3 ° to 6 °.
5. The method for designing the rotor punching sheet of the two-pole motor as claimed in claim 1, wherein in S3, the angle between the boundary line of the C3 on the side close to the center line and the boundary line of the Y-axis symmetric position thereof is a1, and the value range of a1 is as follows: (0.29-0.32) x 180 degrees, the angle between the boundary line of the C5 close to the center line side and the boundary line of the Y-axis symmetric position is a2, and the value range of a2 is as follows: (0.56-0.59) x 180 degrees, wherein the angle between the boundary line of the C7 close to the Y axis and the boundary line of the Y axis symmetric position is a3, and the value range of a3 is as follows: (0.79-0.82) x 180 degrees.
6. The method for designing rotor punching of two-pole motor as claimed in claim 1, wherein 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 value ranges from ax1 to ax4 are: 10 to 12.5 degrees.
7. The method for designing rotor punching of a two-pole motor according to claim 1, wherein in S4, a first layer of the three layers of permanent magnet slots is M1, a second layer of the three layers is M21 and M22, and a third layer of the three layers is M31 and M32, the two layers of permanent magnet slots include a second layer of M21 and M22, and a third layer of 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, M21 and M22 are aligned in parallel, reinforcing ribs with the width of d2 are arranged in the middle of the three layers, and the value range of d2 is as follows: 0 ~ 3mm, M31 and M32 parallel alignment and the centre have the strengthening rib that width is d4 to separate, and the value range of d4 is: 0 to 3 mm.
8. The method for designing the rotor punching of the two-pole motor according to claim 7, wherein in S4, h1 is not less than 1.2mm, h3 is 4% -6.5% of the external circle radius R2, and the upper and lower long sides of each permanent magnet slot are parallel to each other; the included angles between the long sides of the three layers of permanent magnet grooves and the X axis are respectively b1, b2 and b3, and the value ranges of b1, b2 and b3 are 0-30 degrees; the left boundaries of the three permanent magnet grooves M1, M21 and M31 do not exceed the extension lines of the 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 permanent magnet grooves which are symmetrical with the Y axis and M1, M22 and M32 are d1, d3 and d5, and the value ranges of the d1, d3 and d5 are as follows: 0 to 3 mm.
9. The method for designing the rotor punching sheet of the two-pole motor according to claim 8, wherein in S4, the widths of the permanent magnets inserted into M1, M21, M22, M31 and M32 are y1, y21, y22, y31 and y32, respectively, the width of the protruding step of the permanent magnet for blocking 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 located in the area between the arc line L3 and the inner circle; the average gap between the permanent magnet slot and the permanent magnet is e1, and the value range of e1 is as follows: 0.1 mm-0.2 mm.
10. The method for designing the rotor punching sheet of the two-pole motor as recited in claim 9, wherein in S4, an included angle between a reinforcing rib between M31 and M32 and a Y axis is b4, and a value range of b4 is as follows: 0 to 15 degrees; when the values of d1, d2, d3, d4 and d5 are 0, no reinforcing rib is present, and the groove types at two sides are communicated; y21 is identical to y22 and y31 is identical to y 32.
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