CN213305085U - Rotor punching sheet of permanent magnet alternating current generator - Google Patents
Rotor punching sheet of permanent magnet alternating current generator Download PDFInfo
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- CN213305085U CN213305085U CN202022620368.1U CN202022620368U CN213305085U CN 213305085 U CN213305085 U CN 213305085U CN 202022620368 U CN202022620368 U CN 202022620368U CN 213305085 U CN213305085 U CN 213305085U
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- 238000004080 punching Methods 0.000 title claims abstract description 24
- 238000003475 lamination Methods 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005315 distribution function Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The utility model provides a permanent magnet alternating current generator rotor punching, the shape that the outer fringe projection of punching becomes includes: the convex part curved edge is connected with the base curved edge through the connecting curved edge; in a rectangular coordinate system taking a projection point of a central axis as an origin, the convex part curved edge is arranged between the two base curved edges, and the base curved edges and the convex part curved edges of even-number sections are symmetrical about an X axis and a Y axis; the connecting curved edge comprises two connecting circular arcs with different curvatures, and the circle centers of the two connecting circular arcs deviate from the projection point of the central axis and are respectively positioned on two sides of the central axis. The utility model provides a permanent magnet alternating current generator rotor punching, it is when reducing the total distortion rate of voltage harmonic, has overcome motor output and has reduced and unstable defect to not only reduced the total distortion rate of voltage harmonic, still guaranteed the stable power output of motor.
Description
Technical Field
The utility model relates to a generator technical field especially relates to a permanent magnet alternating current generator rotor punching.
Background
The permanent magnet motor has the advantages of high efficiency and small volume, so that the permanent magnet motor is widely concerned by various industries. The magnitude and waveform of the no-load induction voltage of the permanent magnet motor have important influences on the running efficiency, vibration noise, torque fluctuation and the like of the motor. When the voltage transformer is used as a generator for grid-connected operation or independent operation, the requirement on the waveform of the induction voltage is higher. Table 1 shows the total distortion of the harmonic voltage of the utility grid and the upper limit of the content of each harmonic voltage at different voltage levels, which are specified by the national standard GB/T14549-93 "power quality-utility grid harmonic", whereas the total distortion of the no-load induced voltage harmonic of the permanent magnet motor is generally larger than the specification. In order to reduce the total distortion rate of the voltage harmonics, the method mainly adopted at present mainly comprises the following steps:
(1) the fractional slot winding structure with the similar pole number and slot number is adopted, the structure is commonly adopted in a large-scale hydraulic generator and a low-speed permanent magnet motor, and is rarely adopted in occasions with the rotating speed of 3000 r/min and 1500 r/min;
(2) using a skewed slot or a skewed pole technique. The method can effectively reduce the total harmonic distortion rate of the no-load induction voltage of the permanent magnet motor and improve the sine of the voltage waveform, but the manufacturing process of the motor is relatively complex, and the fundamental voltage is also reduced while the harmonic voltage is reduced. In addition, for a large-scale motor, the inclined groove and the inclined pole can bring large axial force, which is not beneficial to the operation of the motor;
(3) the rotor structure is optimized. At present, the conventional interior permanent magnet motor generally adopts the structures shown in the attached figures 1 to 4. Fig. 1 to 3 mainly improve the sine of no-load induced voltage by optimizing the angle, adding an auxiliary slot on the outer circle of the rotor core, optimizing the size of the circumferential opening angle of the auxiliary slot, and the like. However, the corresponding measures have limited reduction of the total harmonic distortion rate of the no-load induction voltage waveform, and are difficult to meet the requirements of the national standard GB/T14549-93. On the basis of fig. 1 to fig. 3, the patent publication CN 110048530B optimizes the no-load induced voltage by the structure shown in fig. 4, so as to reduce the torque ripple, but the motor torque is reduced by adopting the structure, which affects the motor power output.
SUMMERY OF THE UTILITY MODEL
To exist not enough among the prior art, the utility model provides a permanent magnet alternator rotor punching, it has solved among the prior art and has reduced voltage harmonic total distortion rate and optimize motor output behind the rotor structure and reduce and unstable problem.
According to the embodiment of the utility model, a permanent magnet alternator rotor punching sheet, including the rotor body, the rotor body is formed by a plurality of lamination stacks, the rotor body is inside to be equipped with a centre bore and to define a central axis through this centre bore, defines the rectangular coordinate system that uses the projection point of this central axis as the original point in the plane perpendicular to this central axis; in a plane perpendicular to the central axis, the projection of the outer edge of the punching sheet is in a shape comprising: the convex part curved edge is connected with the base curved edge through the connecting curved edge; wherein,
in a rectangular coordinate system with a projection point of the central axis as an origin, the convex part curved edge is arranged between the two base curved edges, and the base curved edges and the convex part curved edges of even number of sections are symmetrical about an X axis and a Y axis;
the connecting curved edge comprises two connecting circular arcs with different curvatures, and the circle centers of the two connecting circular arcs deviate from the projection point of the central axis and are respectively positioned on two sides of the central axis.
Preferably, in a rectangular coordinate system using the projection point of the central axis as an origin, the center of the curved side of the base coincides with the origin; in the two connecting arcs in the nth quadrant, the circle center of the connecting arc connected with the curved edge of the base part is positioned in the quadrant diagonal to the nth quadrant, and the circle center of the connecting arc connected with the curved edge of the convex part is positioned in the nth quadrant.
Preferably, the punching sheet is further provided with an even number of mounting holes which are arranged between the edge of the central hole and the outer edge of the punching sheet.
Preferably, the radius ratio of the two connecting arcs is 1:1.05-1: 1.85.
Preferably, reinforcing ribs are reserved between every two adjacent mounting holes in even number of mounting holes.
Preferably, the curved edge of the convex part comprises an arc, the center of the arc is a projection point of the central axis, and a notch is formed in the arc.
Preferably, the punching sheet is provided with a plurality of through holes.
Preferably, the through holes are circular holes, and a plurality of the through holes are located between the two mounting holes.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides a permanent magnet alternating current generator rotor punching, it is when reducing the total distortion rate of voltage harmonic, has overcome motor output and has reduced and unstable defect to not only reduced the total distortion rate of voltage harmonic, still guaranteed the stable power output of motor.
Drawings
Fig. 1 is a conventional rotor sheet structure.
Fig. 2 is another conventional rotor sheet structure.
Fig. 3 is another prior art rotor lamination configuration.
Fig. 4 is another prior art rotor lamination structure.
FIG. 5 is a distribution function of the remanence and the air gap length of the permanent magnets of the four rotor sheet structures of FIGS. 1-4.
Fig. 6 is a waveform diagram of induced voltages corresponding to the three rotor sheet structures shown in fig. 1-3.
Fig. 7 is an induced voltage waveform diagram of the rotor sheet structure of fig. 4.
Fig. 8 is a schematic structural view of the motor.
Fig. 9 is a schematic structural diagram of a punching sheet according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a punching sheet according to another embodiment of the present invention.
Fig. 11 is the induced voltage waveform diagram after the motor is assembled by the punching sheets of the two embodiments of the present invention.
In the above drawings: 101. a central axis; 301. a central bore; 100. a motor; 10. a stator; 20. a rotor; 30. a rotor body; 31. punching; 32. a base curved edge; 33. a convex curved edge; 34. connecting the curved edges; 35. connecting the arcs; 35a, a first connecting arc; 35b, a second connecting arc 36, a mounting hole; 37. a through hole; 38. reinforcing ribs; 40. a circular arc; 41. a notch; c1, auxiliary tank 1; c2, auxiliary tank 2.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.
Table 1 shows the total distortion rate of the harmonic voltage of the utility grid and the upper limit value of the voltage content of each harmonic under different voltage levels specified by the national standard GB/T14549-93 electric energy quality-harmonic of the utility grid.
TABLE 1
According to Faraday's law of electromagnetic induction, when the number of poles and slots of the permanent magnet motor is fixed and the winding form is fixed, the waveform of the no-load air gap flux density plays a decisive role in the no-load induced electromotive force of the permanent magnet motor. The more sinusoidal the air gap flux density, the more sinusoidal the no-load induced electromotive force. According to the basic law of magnetic circuit, the distribution function of the air gap flux density along the circumference can be expressed as follows under the condition of given permanent magnet thickness and material characteristics:
wherein, mu0＝4π×10-7H/m is magnetic permeability in vacuum; theta is a circumferential angle; lpm(theta) is a function of the circumferential distribution of the thickness of the permanent magnet; lg(θ) is a circumferential distribution function of the air gap length; hpmAnd (theta) is a distribution function of the remanence of the permanent magnet along the circumferential direction.
For the permanent magnet motor with the conventional structure, the distribution function H of the remanence of the magnet along the circumferential directionpmAnd (theta) is a rectangular wave or a step wave. lpm(theta) is that the distribution function of the thickness of the permanent magnet along the circumference is rectangular wave or step wave, the wave form and Hpm(θ) are the same; irrespective of the effect of slotting,/g(theta) is constant in the circumferential direction.
The addition of auxiliary slots 1 and 2 in the outer circumference of the rotor in fig. 1-3 only allows minor adjustments to the circumferential distribution of the air gap length, making it difficult to achieve a high degree of sinusoidal back emf.
Fig. 4 shows the distribution function of the remanence and the air gap length of the permanent magnet in fig. 1-4, fig. 5 (a) shows the distribution function of the remanence corresponding to the structure shown in fig. 1, (b) shows the distribution function of the remanence corresponding to the structure shown in fig. 2-4, (c) shows the distribution function of the air gap length corresponding to the structure shown in fig. 1 and fig. 3, (d) shows the distribution function of the air gap length corresponding to the structure shown in fig. 4, and (e) shows the air gap length corresponding to the structures shown in fig. 9 and fig. 1. It can be seen that the induced electromotive force using the structures shown in fig. 1 to 4 is low in sine degree.
Fig. 6 shows the induced electromotive force waveforms corresponding to the structures of fig. 1 to 3, and the total harmonic distortion is 9.5%.
Fig. 7 is an induced electromotive force waveform of the structure of fig. 4. As can be seen from FIG. 7, since the air gap length function corresponding to FIG. 4 can perform a better conditioning effect on the remanence distribution function of the permanent magnet, the sine of the waveform is improved, and the total harmonic distortion is 7.8%. However, the structure shown in fig. 4 has a fundamental wave of induced electromotive force reduced by about 9% compared with the structure shown in fig. 1-3 because the air gap length of the q-axis position of the structure shown in fig. 4 is large, which causes the space for placing the permanent magnets in the rotor to be reduced.
In view of this, the utility model provides a through the multistage circular arc simulation between d axle and q axle at the rotor excircle, and then realize the air gap length distribution function that figure 5(e) is shown, neither reduce the permanent magnet and place the space, can improve the sinusoidal degree of induced electromotive force again.
Motor structure referring to fig. 8, the motor 100 includes a stator 10 and a rotor 20. The rotor 20 is capable of being driven in rotation about the central axis 101 by a magnetic field. The stator 10 serves to generate a magnetic field for driving the rotor 20 to rotate. The stator 10 is sleeved on the outer periphery of the rotor 20, and the stator 10 and the rotor 20 have a certain air gap interval in the radial direction of the central axis 101.
Referring to fig. 9-10, an embodiment of the present invention provides a permanent magnet alternator rotor lamination, including a rotor body 30, where the rotor body 30 is formed by stacking a plurality of laminations 31, a central hole 301 is formed inside the rotor body 30, and an X-Y rectangular coordinate system with a projection point of a central axis 101 as an origin is defined in a plane perpendicular to the central axis 101; in a plane perpendicular to the central axis 101, a projection of an outer edge of the punching sheet 31 has a shape including: even number of sections of base curved edge 32, even number of sections of convex curved edge 33, and connecting curved edge 34, wherein convex curved edge 33 and base curved edge 32 are connected through connecting curved edge 34; wherein,
in a rectangular coordinate system with the projection point of the central axis 101 as the origin, the convex part curved side 33 is arranged between the two base curved sides 32, and the base curved sides 32 and the convex part curved sides 33 of even-numbered segments are symmetrical about the X axis and the Y axis;
the connecting curved edge 34 includes two sections of a first connecting arc 35a and a second connecting arc 35b with different curvatures, and centers of the first connecting arc 35a and the second connecting arc 35b deviate from a projection point of the central axis 101 and are respectively located on two sides of the central axis 101.
As a specific example, in a rectangular coordinate system with the projection point of the central axis as the origin, the center of the base curved edge 32 coincides with the origin; of the two connecting arcs 35 in the nth quadrant, the center of a first connecting arc 35a connected to the base curved edge 32 is located in a quadrant diagonal to the nth quadrant, and the center of a second connecting arc 35b connected to the convex curved edge 33 is located in the nth quadrant, for example, in a rectangular coordinate system with the projection point of the central axis 101 as the origin, the center of the base curved edge 32 in the second quadrant coincides with the origin; in the two connecting arcs 35 in the second quadrant, the center of a first connecting arc 35a connected with the base curved edge 32 is located in the fourth quadrant, the center of a second connecting arc 35b connected with the convex curved edge 33 is located in the second quadrant, and the radius ratio of the first connecting arc 35a to the second connecting arc 35b is 1:1.05-1: 1.85; the convex part curved edge 33 comprises an arc 40, the center of the arc 40 is the projection point of the central axis 101, and a notch 41 is formed in the arc 40 and is in a V shape.
As a specific embodiment, referring to fig. 9, two groups of mounting holes 36 are formed in the stamped sheet 31 between the edge of the central hole 301 and the outer edge of the stamped sheet 31, each group of two mounting holes 36 is distributed in two layers in the radial direction of the central axis 101, a reinforcing rib 38 is reserved between two adjacent mounting holes 36 in each group, a through hole 37 is further formed between two layers of mounting holes 36, the radius of the base curved edge 32 is 75.5mm, and the radii of the first connecting arc 35a and the second connecting arc 35b are 47.7mm and 79.5mm, respectively.
As a specific embodiment, referring to fig. 10, between an edge of the central hole 301 and an outer edge of the stamped piece 31, different from the first embodiment, four sets of mounting holes 36 are formed in the stamped piece 31, each set of two mounting holes 36 is distributed in two layers in a radial direction of the central axis 101, in order to ensure strength of the stamped piece 31, a reinforcing rib 38 is reserved between two adjacent mounting holes 36 in each set, a through hole 37 is further formed between two layers of mounting holes 36, a radius of the curved edge of the base is 75.5mm, and radii of the first connecting arc 35a and the second connecting arc 35b are 49.4mm and 72.5mm, respectively.
The utility model discloses well connection curved edge 34 comprises the different radial circular arcs in different centre of a circle, through the optimal design to different arc section angles and centre of a circle position, optimizes the air gap magnetic resistance, reduces the total distortion rate of no-load induced voltage harmonic under the very little circumstances of assurance motor output voltage change, improves the sine of no-load induced voltage. Compare in current induced voltage optimization technique, the utility model discloses the no-load induced voltage total harmonic distortion rate under the structure not only satisfies national standard GB/T14549-93's requirement, moreover for the endocentric conventional structure of excircle, no-load induced voltage fundamental wave value can not reduce. In addition, compared with a concentric structure of the excircle of the rotor, the direct-axis inductance of the structure is reduced, and the active power output capacity of the generator is increased; because the excircle of the rotor is of an eccentric structure, the distance from the excircle of the rotor to the inner circle of the stator core of the motor is different at the circumference, the flow speed of air gap air is increased, and the heat dissipation of the motor is facilitated.
Referring to fig. 11, compared with the rotor structure of the electric motor in fig. 1-4, which is common in the prior art, referring to the inductive voltage waveforms of the three rotor structures in fig. 1-3 and the inductive voltage waveform of the rotor structure in fig. 4, which are illustrated in fig. 7, the inductive voltage waveforms of the rotor in the present invention are better sinusoidal and the power output is more stable.
As a specific example, the radii of the first connecting circular arc 35a and the second connecting circular arc 35b are 46.9mm and 73.4mm, and 42.3mm and 71.8mm, respectively.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (10)
1. A permanent magnet alternating current generator rotor punching sheet is provided with a central hole inside the punching sheet, a central axis passing through the central hole is defined, and a rectangular coordinate system taking a projection point of the central axis as an original point is defined in a plane perpendicular to the central axis; in a plane perpendicular to the central axis, the projection of the outer edge of the punching sheet is in a shape comprising: the convex part curved edge is connected with the base curved edge through the connecting curved edge; wherein,
in a rectangular coordinate system with a projection point of the central axis as an origin, the convex part curved edge is arranged between the two base curved edges, and the base curved edges and the convex part curved edges of even number of sections are symmetrical about an X axis and a Y axis; the method is characterized in that:
the connecting curved edge comprises two connected connecting arcs with different curvatures, and the circle centers of the two connecting arcs deviate from the projection point of the central axis and are respectively positioned on two sides of the central axis.
2. The permanent magnet alternator rotor lamination of claim 1, wherein: in a rectangular coordinate system taking the projection point of the central axis as an origin, the circle center of the curved edge of the base part is coincided with the origin; in the two connecting arcs in the nth quadrant, the circle center of the connecting arc connected with the curved edge of the base part is positioned in the quadrant diagonal to the nth quadrant, and the circle center of the connecting arc connected with the curved edge of the convex part is positioned in the nth quadrant.
3. The permanent magnet alternator rotor lamination of claim 1, wherein: the punching sheet is also provided with an even number of mounting holes which are arranged between the edge of the central hole and the outer edge of the punching sheet.
4. A permanent magnet alternator rotor lamination as claimed in any one of claims 1 to 3, wherein: the radius ratio of the two connecting arcs is 1:1.05-1: 1.85.
5. The permanent magnet alternator rotor lamination of any one of claims 4, wherein: the radius ratio of the two connecting arcs is 1:1.45-1: 1.75.
6. A permanent magnet alternator rotor lamination as claimed in claim 3, wherein: and reinforcing ribs are reserved between every two adjacent mounting holes in the even number of mounting holes.
7. The permanent magnet alternator rotor lamination of claim 1, wherein: the convex part curved edge comprises an arc, and the circle center of the arc is the projection point of the central axis.
8. The permanent magnet alternator rotor lamination of claim 7, wherein: the arc is provided with a notch.
9. The permanent magnet alternator rotor lamination of claim 6, wherein: the punching sheet is provided with a plurality of through holes.
10. The permanent magnet alternator rotor lamination of claim 9, wherein: the through-hole is the circular port, and is a plurality of the through-hole is located two between the mounting hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022620368.1U CN213305085U (en) | 2020-11-12 | 2020-11-12 | Rotor punching sheet of permanent magnet alternating current generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022620368.1U CN213305085U (en) | 2020-11-12 | 2020-11-12 | Rotor punching sheet of permanent magnet alternating current generator |
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| CN213305085U true CN213305085U (en) | 2021-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021123754A1 (en) | 2021-09-14 | 2023-03-16 | Bayerische Motoren Werke Aktiengesellschaft | Rotor contour of an electrical machine to reduce magnetic force excitations |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021123754A1 (en) | 2021-09-14 | 2023-03-16 | Bayerische Motoren Werke Aktiengesellschaft | Rotor contour of an electrical machine to reduce magnetic force excitations |
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