CN211127344U - Rotor capable of reducing eddy current loss and permanent magnet synchronous motor - Google Patents
Rotor capable of reducing eddy current loss and permanent magnet synchronous motor Download PDFInfo
- Publication number
- CN211127344U CN211127344U CN201921888989.9U CN201921888989U CN211127344U CN 211127344 U CN211127344 U CN 211127344U CN 201921888989 U CN201921888989 U CN 201921888989U CN 211127344 U CN211127344 U CN 211127344U
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- rotor
- iron core
- eddy current
- current loss
- magnet steel
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 37
- 241000826860 Trapezium Species 0.000 claims abstract description 6
- 238000002955 isolation Methods 0.000 claims description 8
- 230000004907 flux Effects 0.000 abstract description 8
- 230000005389 magnetism Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model discloses a can reduce rotor of eddy current loss, including iron core and magnet steel, the iron core is inside to be formed with the holding tank, the magnet steel sets up in the holding tank, the middle part of magnet steel is thick, both ends are thin, so that the magnet steel is close to the outside direction protrusion setting of iron core to the side of iron core outside direction, the magnet steel is whole to be triangle trapezium structure, triangle trapezium structure includes first side, first side is close to the outside direction setting of iron core, first side comprises two inclined planes, the junction of two inclined planes is formed with convex closed angle, the pointed end of closed angle sets up towards the outside direction of iron core; a permanent magnet synchronous motor containing the rotor is also disclosed. The utility model discloses a can reduce eddy current loss's rotor and PMSM effectively has improved the counter electromotive force wave form through the structure of optimizing magnet steel and iron core, has reduced air gap flux density harmonic and PMSM's eddy current loss, has improved motor efficiency.
Description
Technical Field
The utility model relates to a motor especially relates to a can reduce eddy current loss's rotor and contain PMSM of this rotor.
Background
A permanent magnet synchronous motor is a synchronous motor which generates a synchronous rotating magnetic field by permanent magnet excitation, and generally comprises a stator and a rotor, wherein magnetic steel is arranged in the rotor. The harmonic content of the no-load back electromotive force of the motor reflects the harmonic content of the air gap flux density of the motor, and the harmonic of the air gap flux density is a main source of the eddy current loss of the rotor of the permanent magnet synchronous motor.
The existing permanent magnet synchronous motor has the advantages that the magnetic steel in the rotor is mostly of a linear structure, the back electromotive force harmonic content of the motor of the rotor structure is high, the sine degree is poor, the eddy current loss of the motor is large, the motor generates heat seriously, and the motor efficiency is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a can reduce eddy current loss's rotor and PMSM through the shape of improving magnet steel in the rotor and the structure of iron core, reduces PMSM's eddy current loss. The specific technical scheme is as follows:
the utility model provides a can reduce eddy current loss's rotor, including iron core and magnet steel, the inside holding tank that is formed with of iron core, the magnet steel sets up in the holding tank, the middle part of magnet steel is thick, both ends are thin, so that the magnet steel is close to the outside direction protrusion setting of iron core to the side of the outside direction of iron core, the magnet steel is whole to be triangle trapezium structure, triangle trapezium structure includes first side, first side is close to the outside direction setting of iron core, first side comprises two inclined planes, the junction on two inclined planes is formed with convex closed angle, the most advanced outside direction setting towards the iron core of closed angle.
Furthermore, the triangular trapezoidal structure comprises a second side surface which is a plane and is arranged close to the center direction of the iron core.
Further, the maximum thickness of the middle part of the magnetic steel is a first thickness, the minimum thicknesses of the two ends of the magnetic steel are second thicknesses, and the ratio of the first thickness to the second thickness is 2: 1.
Furthermore, the distance between two unconnected ends of the two inclined planes forming the first side surface of the triangular trapezoidal structure is a first width, the width of the second side surface of the triangular trapezoidal structure is a second width, and the ratio of the first width to the second width is more than 0.9 and less than 0.98.
Further, the shape of holding tank and the shape phase-match of magnet steel are triangle-shaped trapezoidal, and the inside wall that the holding tank is close to iron core center direction is the plane, the inside wall of the direction perpendicular to holding tank that magnetizes of rotor.
Further, the both ends of holding tank are provided with and separate magnetic air gap.
Further, separate magnetism air gap and holding tank integrated into one piece setting, separate the magnetism air gap and extend the setting to the marginal direction of iron core from the tip of holding tank, leave the joint gap between the edge of separating magnetism air gap and iron core.
Further, be provided with a plurality of holding tanks on the iron core, a plurality of holding tanks encircle the border position that sets up at the iron core, are provided with a plurality of magnet steels in a plurality of holding tanks, and the magnet steel that is located adjacent position is the N utmost point and S utmost point distribution in turn.
Furthermore, the magnetic steel is of a one-piece structure or a multi-piece splicing structure.
A permanent magnet synchronous motor comprises any one of the rotors capable of reducing eddy current loss.
The utility model discloses a can reduce eddy current loss's rotor and PMSM effectively has improved the counter electromotive force waveform through the structure of optimizing magnet steel and iron core, has reduced air gap flux density harmonic and PMSM's eddy current loss, has improved motor efficiency, has solved the motor and has aroused the problem that the motor generates heat seriously, inefficiency because of the eddy current loss is high. The utility model discloses a can reduce eddy current loss's rotor and PMSM has improved the sine degree of back electromotive force wave form, has optimized air gap flux density harmonic wave form, has reduced calorific capacity among the motor working process, has improved synchronous machine's performance.
Drawings
Fig. 1 is a cross-sectional view of a rotor of the present invention, which can reduce eddy current loss.
Fig. 2 is a cross-sectional view of the magnetic steel of the present invention.
Detailed Description
In order to better understand the purpose, function and specific design scheme of the present invention, the rotor and the permanent magnet synchronous motor of the present invention, which can reduce eddy current loss, are described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a can reduce rotor of eddy current loss includes columniform iron core 10, and the central point of iron core 10 puts and is provided with pivot through-hole 11, can set up the pivot in the pivot through-hole 11, and the rotor can revolute the rotation of axes. A plurality of accommodating grooves 12 are formed in the iron core 10, and the accommodating grooves 12 are uniformly arranged at the edge of the iron core 10 in a surrounding manner; install a magnet steel 20 in every holding tank 12, the magnet steel 20 that is located adjacent position is the utmost point and S utmost point alternate distribution.
Further, as shown in fig. 1 and fig. 2, the whole magnetic steel 20 is of a triangular trapezoid structure, the middle of the magnetic steel 20 is thick, the two ends of the magnetic steel are thin, and the middle of the magnetic steel is evenly transited to the thickness of the two ends, so that the thick middle position of the magnetic steel 20 protrudes outwards, and the protruding direction of the magnetic steel protrudes towards the outside of the iron core 10.
Specifically, the triangular trapezoid structure includes a first side 21 and a second side 22, wherein the first side 21 is disposed near the outer direction of the iron core 10, the second side 22 is disposed near the center direction of the iron core 10, and the protruding structure in the middle of the magnetic steel 20 is located on the first side 21. The first side surface 21 of the triangular trapezoid structure is composed of two inclined surfaces, and the two inclined surfaces have the same length and jointly form an isosceles trapezoid shape. A convex sharp corner 23 is formed at the joint of the two inclined planes, and the tip of the sharp corner 23 faces the outer direction of the iron core 10; the second side 22 of the triangular trapezoidal structure is a plane. In addition, unfilled corners are formed at the end parts of the two sides of the triangular trapezoidal structure.
Further, as shown in fig. 2, the maximum thickness of the middle portion of the magnetic steel 20 is a first thickness 24, that is, the distance from the sharp corner 23 on the first side surface 21 of the magnetic steel 20 to the second side surface 22 of the magnetic steel 20; the minimum thickness of the two ends of the magnetic steel 20 is a second thickness 25, namely the distance from the edge of the first side surface 21 of the magnetic steel 20 to the second side surface 22 of the magnetic steel 20; the ratio of the first thickness 24 to the second thickness 25 is 2: 1.
Furthermore, the two inclined surfaces of the first side surface 21 forming the triangular trapezoid structure have a convex sharp corner 23 at the connected end, and the distance between the two unconnected ends is the first width 26 of the magnetic steel 20; the width of the second side surface 22 of the triangular trapezoid structure is the second width 27 of the magnetic steel 20; the ratio of the first width 26 to the second width 27 is greater than 0.9 and less than 0.98.
Through limiting the thickness and the width of the magnetic steel, the length of the magnetic steel in the magnetizing direction is changed, the counter electromotive force waveform is optimized, the more excellent the sine degree of the counter electromotive force waveform of the motor is, the lower the harmonic content is, and the reduction of the electromagnetic noise of the motor is facilitated. In addition, the overall shape of the magnetic steel is in an axially symmetrical sine structure, so that the sine degree of the back electromotive force waveform of the motor is improved, and the cogging torque and the torque fluctuation are reduced.
Further, as shown in fig. 1, the shape of holding tank 12 on the iron core 10 matches with the shape of magnet steel 20, and is also triangle-shaped, and the inside wall that holding tank 12 is close to iron core 10 central direction also is the plane, the utility model provides a rotor magnetize the inside wall of direction perpendicular to holding tank 12.
Further, two ends of the accommodating groove 12 are respectively provided with a magnetic isolation air gap 13, and the magnetic isolation air gap 13 is of a rectangular groove structure and is integrally formed with the accommodating groove 12. The magnetic isolation air gap 13 extends from the end of the receiving slot 12 toward the edge of the core 10, and a connection gap 14 is left between the magnetic isolation air gap 13 and the edge of the core 10.
When magnet steel 20 sets up in holding tank 12, separate magnetic air gap 13 and be located magnet steel 20's both sides, at this moment, separate magnetic air gap 13 and can rule the distribution of magnetic line of force in the iron core 10, increase air gap flux density, and then promote the motor salient pole ratio, improve the work efficiency of motor.
Further, the number of poles of the rotor of the present invention, which can reduce the eddy current loss, may be three poles as shown in fig. 1, and may be two poles, four poles or other numbers of poles; the magnetic steel 20 may be a one-piece structure or a multi-piece spliced structure.
The utility model discloses in still include a PMSM, this PMSM includes above arbitrary one can reduce eddy current loss's rotor.
The utility model discloses a can reduce eddy current loss's rotor and PMSM effectively has improved the counter electromotive force waveform through the structure of optimizing magnet steel and iron core, has reduced air gap flux density harmonic and PMSM's eddy current loss, has improved motor efficiency, has solved the motor and has aroused the problem that the motor generates heat seriously, inefficiency because of the eddy current loss is high. The utility model discloses a can reduce eddy current loss's rotor and PMSM has improved the sine degree of back electromotive force wave form, has optimized air gap flux density harmonic wave form, has reduced calorific capacity among the motor working process, has improved synchronous machine's performance.
The present invention has been further described with reference to specific embodiments, but it should be understood that the specific description herein should not be construed as limiting the spirit and scope of the present invention, and that various modifications to the above-described embodiments, which would occur to persons skilled in the art after reading this specification, are within the scope of the present invention.
Claims (10)
1. The utility model provides a can reduce eddy current loss's rotor, a serial communication port, including iron core and magnet steel, the inside holding tank that is formed with of iron core, the magnet steel sets up in the holding tank, the middle part of magnet steel is thick, both ends are thin, so that the magnet steel is close to the outside direction protrusion setting of iron core outside direction, the magnet steel is whole to be triangle trapezium structure, triangle trapezium structure includes first side, first side is close to the outside direction setting of iron core, first side comprises two inclined planes, the junction on two inclined planes is formed with convex closed angle, the most advanced outside direction setting towards the iron core of closed angle.
2. The rotor capable of reducing eddy current loss according to claim 1, wherein the triangular trapezoid structure includes a second side, the second side is a plane, and the second side is disposed near the center of the core.
3. The rotor of claim 1 or 2, wherein the maximum thickness of the middle portion of the magnetic steel is a first thickness, the minimum thickness of the two ends of the magnetic steel is a second thickness, and the ratio of the first thickness to the second thickness is 2: 1.
4. The rotor of claim 3, wherein the two inclined planes forming the first side of the triangular trapezoid structure are spaced apart from each other by a first width, the width of the second side of the triangular trapezoid structure is a second width, and the ratio of the first width to the second width is greater than 0.9 and less than 0.98.
5. The rotor of claim 1 or 2, wherein the shape of the receiving groove matches the shape of the magnetic steel, and is in a triangular trapezoid shape, the inner side wall of the receiving groove in the direction close to the center of the core is a plane, and the magnetizing direction of the rotor is perpendicular to the inner side wall of the receiving groove.
6. The rotor capable of reducing the eddy current loss according to claim 5, wherein both ends of the receiving groove are provided with magnetic isolation air gaps.
7. The rotor of claim 6, wherein the magnetic isolation air gap is integrally formed with the receiving slot, the magnetic isolation air gap extends from the end of the receiving slot toward the edge of the core, and a connection gap is formed between the magnetic isolation air gap and the edge of the core.
8. The rotor according to claim 1 or 2, wherein a plurality of receiving slots are disposed on the core, the plurality of receiving slots are disposed around an edge of the core, a plurality of magnetic steels are disposed in the plurality of receiving slots, and N poles and S poles of the magnetic steels disposed at adjacent positions are alternately distributed.
9. The rotor of claim 8, wherein the magnetic steel has a one-piece structure or a multi-piece structure.
10. A permanent magnet synchronous machine comprising the rotor capable of reducing eddy current loss according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921888989.9U CN211127344U (en) | 2019-11-04 | 2019-11-04 | Rotor capable of reducing eddy current loss and permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921888989.9U CN211127344U (en) | 2019-11-04 | 2019-11-04 | Rotor capable of reducing eddy current loss and permanent magnet synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211127344U true CN211127344U (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921888989.9U Active CN211127344U (en) | 2019-11-04 | 2019-11-04 | Rotor capable of reducing eddy current loss and permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211127344U (en) |
-
2019
- 2019-11-04 CN CN201921888989.9U patent/CN211127344U/en active Active
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