CN213602464U - High-efficiency Halbach array permanent magnet synchronous motor - Google Patents
High-efficiency Halbach array permanent magnet synchronous motor Download PDFInfo
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- CN213602464U CN213602464U CN202022990657.0U CN202022990657U CN213602464U CN 213602464 U CN213602464 U CN 213602464U CN 202022990657 U CN202022990657 U CN 202022990657U CN 213602464 U CN213602464 U CN 213602464U
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Abstract
The utility model relates to a high-efficiency Halbach array permanent magnet synchronous motor, which comprises a stator, an armature winding, a rotor sheath, a rotor permanent magnet and a rotating shaft, wherein the rotor permanent magnet is a partitioned Halbach array, and the Halbach array adopts a structure that each Halbach array is more than or equal to two; the rotor sheath is made of non-magnetic material. By adopting the motor structure, the efficiency of the permanent magnet synchronous motor can be improved, the torque pulsation is reduced, the Halbach array is used for adjusting the air gap flux density and reducing the magnetic leakage of the yoke part of the rotor, so that the surface loss of an iron core and the eddy current loss of a permanent magnet are smaller, the rotor sheath is made of a non-magnetic material, the sine shape of the air gap flux density is further improved, and the aim of improving the motor efficiency is fulfilled.
Description
Technical Field
The utility model relates to a motor specifically relates to a Halbach array PMSM, rotor novel structure and have high efficiency and high power density.
Background
The permanent magnet synchronous motor has the characteristics of high efficiency, high power density, torque density, wide speed regulation range and the like, and is widely applied to the industrial field, in particular to the electric automobile and rail transit industry. Because the permanent magnet synchronous motor has higher requirements on power factors, torque pulsation and efficiency, the air gap magnetic flux density and back electromotive force are important considerations when the motor is designed and developed.
The Halbach array is composed of permanent magnets in different directions, the simpler structure is only composed of a radial structure and a tangential structure, the radial magnet and the tangential magnet respectively generate magnetic fields, and the spatial magnetic field is the result of the synthesis of the magnetic fields. Since the Halbach array structure has the excellent characteristics of single-side magnetic field sine, magnetic self-shielding and the like, the characteristic is obviously favorable for the design of the permanent magnet motor.
In the existing research, double-layer Halbach is adopted to enhance the electromagnetic performance of a Halbach permanent magnet synchronous motor, improve the amplitude of a gap flux density fundamental wave and improve the sine of a gap magnetic field, but the utilization rate of a permanent magnet is reduced. Through parameter optimization of a block type interpolar partition Halbach magnetic steel permanent magnet synchronous motor, a good air gap flux density waveform is obtained, but machining is complex due to continuous 3-section magnetizing.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a Halbach array PMSM that processing technology is simple, the equipment is convenient is designed for further improving PMSM's efficiency, reducing the torque pulsation.
The utility model discloses a realize through following technical scheme.
A high-efficiency Halbach array permanent magnet synchronous motor comprises a stator, an armature winding, a rotor sheath, a rotor permanent magnet and a rotating shaft; the permanent magnet synchronous motor is characterized in that an air gap exists between a stator and a rotor sheath, the rotor is positioned in the stator and fixed on the rotating shaft, the rotor permanent magnet is arranged on the rotor and positioned between the rotor and the rotor sheath, and the armature winding is arranged on the stator; the rotor permanent magnet is a segmented Halbach array, and the Halbach array adopts a structure that each Halbach array is larger than or equal to two; the rotor sheath is made of non-magnetic materials.
The rotor permanent magnet consists of a single-layer Halbach array and auxiliary magnetic steel, the Halbach array consists of two adjacent pieces of magnetic steel with the magnetizing angle difference of 90 degrees, the auxiliary magnetic steel consists of radial magnetized magnetic steel, and the auxiliary magnetic steel and the Halbach magnetic steel rotate at the same angular speed.
The center line of the Halbach array magnetic steel in the rotor permanent magnet coincides with the center line of the auxiliary magnetic steel, and the included angle of the two center lines is 0.
By adopting the technical scheme, the beneficial effects are as follows: increase the auxiliary magnetic pole on Halbach array's basis, at the embedded magnet steel of rotor, increase radial magnetic force line, guide more magnetic force lines and get into Halbach array, reduce the magnetic leakage of rotor yoke portion, change the sine degree of radial magnetic flux density fundamental wave amplitude and wave form, make air gap magnetic field magnetic flux wave form more towards the sine nature, the fundamental wave amplitude is bigger, harmonic distortion rate is littleer, effective air gap length diminishes, torque ripple is littleer, iron core surface loss and permanent magnet eddy current loss are littleer, motor efficiency has obtained the improvement.
By adopting the technical scheme, the beneficial effects are as follows: increase the auxiliary magnetic pole on Halbach array's basis, at the embedded magnet steel of rotor, increase radial magnetic force line, guide more magnetic force lines and get into Halbach array, reduce the magnetic leakage of rotor yoke portion, change the sine degree of radial magnetic flux density fundamental wave amplitude and wave form, make air gap magnetic field magnetic flux wave form more towards the sine nature, the fundamental wave amplitude is bigger, harmonic distortion rate is littleer, effective air gap length diminishes, torque ripple is littleer, iron core surface loss and permanent magnet eddy current loss are littleer, motor efficiency has obtained the improvement.
Drawings
Figure 1 is the utility model discloses a high efficiency Halbach array PMSM.
Fig. 2 is a schematic diagram of the rotor permanent magnet in fig. 1 adopting a Halbach array.
Fig. 3 is a schematic diagram of a conventional Halbach structure according to an embodiment of the present invention.
Fig. 4 is a schematic view of the rotor permanent magnet of the present invention adopting Halbach array magnetic force lines.
In the figure, 1-stator, 2-armature winding, 3-rotor, 4-rotor sheath, 5-rotor permanent magnet, 6-rotating shaft, 7-Halbach array magnetic steel, 8-auxiliary magnetic steel, 9-arc angle of two Halbach permanent magnet array magnetic steels in each pole, and 10-magnetizing angle of two adjacent magnetic steels.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, and it should be understood that the embodiments described herein are merely for purposes of illustration and explanation, and the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, an embodiment of the Halbach array permanent magnet synchronous motor of the present invention includes a stator, an armature winding, a rotor sheath, a rotor permanent magnet, and a rotating shaft, wherein the rotor permanent magnet is a partitioned Halbach array, and an air gap is left between a stator core and the rotor sheath. The permanent magnet of the Halbach motor is fixed by a sticking or binding method like a common permanent magnet synchronous motor, so that the Halbach motor also has the problem of reliability, and a sheath is also required to reinforce the Halbach motor so as to meet the requirement of high-speed operation. The sheath can be divided into two types of magnetic conduction and non-magnetic conduction, and when the sheath that the rotor plus is the non-magnetic conduction material, the thickness that is equivalent to the motor air gap has increased a section of thick bamboo wall, can make the distribution of magnetic field more tend to the sine.
The rotor is fixed on the rotating shaft and can rotate in the stator along with the rotating shaft. The Halbach permanent magnet array is arranged on the rotor and is positioned between the rotor and the rotor sheath. When the rotor rotates in the stator, the Halbach permanent magnet array can be driven to rotate in the stator, and the auxiliary magnetic steel and the Halbach magnetic steel have the same angular speed.
Figure 4 is the utility model discloses Halbach magnetic force line graph has reduced the magnetic leakage of rotor yoke portion. The Halbach permanent magnet array is a surface-mounted permanent magnet arrangement structure formed by arranging radial and tangential magnetization according to a certain sequence. The auxiliary magnetic steel is composed of radially magnetized magnetic steel, an air gap main magnetic field is formed by a Halbach array magnetic field and a synthetic magnetic field of the auxiliary magnetic steel magnetic field, the center line of the Halbach permanent magnet array magnetic steel is superposed with the center line of the auxiliary magnetic steel, namely the included angle of the two center lines is 0, the mechanical angle of each magnetic steel in the Halbach permanent magnet array is variable, for the Halbach permanent magnet array of each pole, the included angle alpha of each magnetic steel is pi/2 p, the magnetizing included angle gamma of two adjacent magnetic steels is pi (p-1)/2p, and p is the pole pair number.
For comparison, an example motor is given. The motor of the example is a 12-pole 27-slot structure and has a rated rotating speed of 650 r/min. The main structural parameters of the motor in the embodiment are as follows: the outer diameter of the stator is 248mm, the inner diameter is 121.6mm, the outer diameter of the rotor is 120mm, the length of the iron core is 55mm, and the thickness of the permanent magnet is 5 mm. The utility model provides a thickness of Halbach magnet steel and supplementary magnet steel is 5mm in the Halbach array, and the mechanical angle of supplementary magnet steel is 1/2 of Halbach magnet steel, and under the same permanent magnetism quantity, the magnet steel thickness of traditional Halbach array is 7.3mm, and other parameters of two kinds of motors are all the same. And (5) analyzing the back electromotive force, the cogging torque and the output torque of the motor through Maxwell. Can obtain the air gap magnetic flux density wave form and basically unanimous, wherein the distortion rate of traditional Halbach array is 25.8%, and the harmonic distortion rate is very big, causes torque ripple and permanent magnet eddy current loss, rotor surface loss, and the utility model discloses a distortion rate of Halbach is 20.5%, greatly reduced the harmonic distortion rate, reduced torque ripple; the no-load back electromotive force of two kinds of motors compares, the utility model discloses a back electromotive force root mean square of Halbach array is 42.82V, and the same traditional Halbach array back electromotive force root mean square of using the magnetic quantity is 38.35V, the utility model discloses Halbach is 11.6% bigger than traditional Halbach's back electromotive force, the utility model discloses a Halbach's back electromotive force fundamental wave amplitude is than traditional increase, and harmonic distortion rate reduces, and then has reduced the amplitude of tooth's socket torque; under the rated current, the utility model discloses a Halbach's output torque has increased 13.7% than traditional Halbach, and output torque pulsation is minimum only 0.5%. Synthesize above-mentioned data, compare with traditional Halbach, the utility model discloses a Halbach array makes air gap magnetic field flux density wave form more towards the sinusoid, and fundamental wave amplitude is bigger, and harmonic distortion rate is littleer, and iron core surface loss and permanent magnet eddy current loss are littleer, and motor efficiency has obtained the improvement.
Claims (5)
1. A high-efficiency Halbach array permanent magnet synchronous motor comprises a stator (1), an armature winding (2), a rotor (3), a rotor sheath (4), a rotor permanent magnet (5) and a rotating shaft (6); the permanent magnet synchronous motor is characterized in that an air gap exists between a stator (1) and a rotor sheath (4), the rotor (3) is positioned in the stator (1) and fixed on the rotating shaft (6), the rotor permanent magnet (5) is arranged on the rotor (3) and positioned between the rotor (3) and the rotor sheath (4), and the armature winding (2) is arranged on the stator (1); the rotor permanent magnet (5) is a segmented Halbach array, and each Halbach array adopts a structure of which the number is more than or equal to two; the rotor sheath (4) is made of a non-magnetic material.
2. A high efficiency Halbach array permanent magnet synchronous machine according to claim 1, characterized in that: the rotor permanent magnet (5) is formed by stacking a single-layer Halbach permanent magnet array and auxiliary magnetic steel, and each pole of the rotor permanent magnet is provided with three permanent magnets.
3. A high efficiency Halbach array permanent magnet synchronous machine according to claim 1, characterized in that: in the rotor permanent magnet (5), the Halbach permanent magnet array adopts parallel magnetization, each pole has two magnetic steels, and the magnetizing angles of two adjacent magnetic steels are different by 90 degrees.
4. A high efficiency Halbach array permanent magnet synchronous machine according to claim 2, characterized in that: the auxiliary magnetic steel is composed of radial magnetized magnetic steel, and the auxiliary magnetic steel and the Halbach magnetic steel rotate at the same angular speed.
5. A high efficiency Halbach array permanent magnet synchronous machine according to claim 1, characterized in that: in the rotor permanent magnet (5), the center line of the Halbach permanent magnet array magnetic steel is superposed with the center line of the auxiliary magnetic steel, and the included angle of the two center lines is 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022990657.0U CN213602464U (en) | 2020-12-14 | 2020-12-14 | High-efficiency Halbach array permanent magnet synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022990657.0U CN213602464U (en) | 2020-12-14 | 2020-12-14 | High-efficiency Halbach array permanent magnet synchronous motor |
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| CN213602464U true CN213602464U (en) | 2021-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022990657.0U Expired - Fee Related CN213602464U (en) | 2020-12-14 | 2020-12-14 | High-efficiency Halbach array permanent magnet synchronous motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350480A (en) * | 2020-12-14 | 2021-02-09 | 哈尔滨理工大学 | High-efficiency Halbach array permanent magnet synchronous motor |
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2020
- 2020-12-14 CN CN202022990657.0U patent/CN213602464U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350480A (en) * | 2020-12-14 | 2021-02-09 | 哈尔滨理工大学 | High-efficiency Halbach array permanent magnet synchronous motor |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210702 Termination date: 20211214 |
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| CF01 | Termination of patent right due to non-payment of annual fee |