CN220358902U - Rare earth-free permanent magnet synchronous motor - Google Patents
Rare earth-free permanent magnet synchronous motor Download PDFInfo
- Publication number
- CN220358902U CN220358902U CN202321486622.0U CN202321486622U CN220358902U CN 220358902 U CN220358902 U CN 220358902U CN 202321486622 U CN202321486622 U CN 202321486622U CN 220358902 U CN220358902 U CN 220358902U
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- Prior art keywords
- permanent magnet
- synchronous motor
- magnet synchronous
- wall
- rare earth
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 39
- 238000004804 winding Methods 0.000 claims abstract description 27
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 9
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 13
- 150000002910 rare earth metals Chemical class 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 5
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005405 multipole Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The utility model discloses a rare-earth-free permanent magnet synchronous motor, which comprises a casing, wherein a stator core is arranged in the casing, a groove is formed in the inner wall of the stator core, windings are arranged on the inner wall of the stator core, the windings are distributed at equal intervals in a circular ring shape relative to the inner wall of the stator core, and a magnet is a ferrite magnet. The device can reduce the cost of the permanent magnet synchronous motor under the condition of ensuring the primary energy efficiency ratio and the characteristics of the permanent magnet synchronous motor, thereby being capable of replacing an asynchronous motor with the same machine base number and the same power.
Description
Technical Field
The utility model relates to the technical field of permanent magnet synchronous motors, in particular to a rare earth-free permanent magnet synchronous motor.
Background
The permanent magnet synchronous motor uses the permanent magnet to provide excitation, so that the motor structure is simpler, the processing and assembly cost is reduced, a collecting ring and an electric brush which are easy to cause problems are omitted, and the operation reliability of the motor is improved; and because exciting current is not needed, exciting loss is avoided, and the efficiency and the power density of the motor are improved.
Because the remanence (Br) of the rare earth permanent magnet is relatively high, the nominal remanence is generally more than 1.1 Tesla, the magnets of the existing permanent magnet synchronous motor all use the rare earth permanent magnet, and the existing permanent magnet synchronous motor has the following defects:
1. the price of the rare earth permanent magnet is very high, and the permanent magnet of the permanent magnet synchronous motor adopting the rare earth permanent magnet accounts for 30% -50% of the total cost of the motor, so that the cost of the motor is relatively high;
2. the price of rare earth has great fluctuation, and multiple increases often occur, so that the cost of the permanent magnet synchronous motor is difficult to control;
3. the rare earth is less and the price is more and more expensive;
4. compared with an asynchronous motor with the same base number and the same power, the length of the iron core of the permanent magnet synchronous motor is about one third to two thirds of that of the asynchronous motor, so that the height of copper wires at the end part of the stator is far greater than that of the iron core, and the consumption of the copper wires is wasted.
Disclosure of Invention
The utility model aims to provide a rare-earth-free permanent magnet synchronous motor, which aims to solve the problem that the permanent magnet synchronous motor adopting rare-earth permanent magnets is high in cost in the prior art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a permanent magnet synchronous motor without rare earth, includes the casing, the inside stator core that is provided with of casing, stator core inner wall are provided with the winding, and the winding inner wall is provided with rotor core, and rotor core inner wall is provided with the magnet, and the magnet is the equidistant distribution of ring shape about rotor core inner wall, and the magnet is ferrite magnet, the inside fixedly connected with drive shaft of rotor core is provided with the magnetic bridge on the rotor core, the magnetic bridge width is less than 1.0mm, the inside fixedly connected with magnet of magnetic bridge, rotor core is eccentric structure.
Preferably, the magnet is in a square structure and is used for controlling the material consumption.
Preferably, the windings are distributed at equal intervals in a circular ring shape with respect to the inner wall of the stator core.
Preferably, the inner wall of the stator core is provided with a groove, and a winding is arranged in the groove.
Compared with the prior art, the utility model has the beneficial effects that:
(1) The device can reduce the cost of the permanent magnet synchronous motor under the condition of ensuring the primary energy efficiency ratio and the characteristics of the permanent magnet synchronous motor, thereby being capable of replacing an asynchronous motor with the same machine base number and the same power.
(2) The device designs the magnet and the magnetic circuit of the rotor core, and utilizes ferrite to replace rare earth permanent magnets to manufacture the permanent magnet synchronous motor; meanwhile, the pole pair number of the motor is properly increased or a concentrated winding (the span is equal to 1) is adopted, so that the span of the winding is reduced, the copper consumption of the winding end is reduced, and the cost of the permanent magnet synchronous motor is reduced under the condition that the primary energy efficiency ratio and the characteristics of the permanent magnet synchronous motor are ensured by adopting a ferrite magnet and a multipolar pair number through the two points, so that the asynchronous motor with the same machine base number and the same power can be replaced.
(3) The magnet of the device adopts an eccentric structure, so that an uneven air gap is generated, and then the permanent magnet synchronous motor generates pure string-shaped no-load counter electromotive force.
Drawings
FIG. 1 is a schematic diagram of a rare earth-free permanent magnet synchronous motor according to the present utility model;
FIG. 2 is a cross-sectional view of a housing of a rare earth-free permanent magnet synchronous motor according to the present utility model;
fig. 3 is a front view of a rotor core of a rare earth-free permanent magnet synchronous motor according to the present utility model;
fig. 4 is a schematic diagram of an envelope circle of a rotor and a radius of a rotor pole of a rare earth-free permanent magnet synchronous motor according to the present utility model.
In the figure: 1. a stator core; 2. a winding; 3. a rotor core; 4. a magnet; 5. a magnetic bridge; 6. a drive shaft; 7. and a housing.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-3, in a first embodiment of the present utility model, a technical scheme is provided: the permanent magnet synchronous motor without rare earth comprises a shell 7, wherein a stator core 1 is arranged in the shell 7, the shell 7 is fixedly connected with the stator core 1, a winding 2 is arranged on the inner wall of the stator core 1, and the winding 2 is distributed at equal intervals in a circular ring shape relative to the inner wall of the stator core 1; the inner wall of the stator core 1 is provided with a groove, and a winding 2 is arranged in the groove; the structure can generate a magnetic field by arranging the winding 2; the inner wall of the winding 2 is provided with a rotor core 3, a driving shaft 6 is fixedly connected inside the rotor core 3, a magnetic bridge 5 is arranged on the rotor core 3, and the rotor core 3 is integrally connected with the magnetic bridge 5; the structure is used for fixing the magnet 4 by arranging the magnetic bridge 5, so that the position deviation of the magnet 4 is avoided; the width of the magnetic bridge 5 is smaller than 1.0mm, and the magnet 4 is fixedly connected inside the magnetic bridge 5; this structure can control the volume of the magnet 4; the position of the embedded magnet 4 is of a V-shaped structure, and the rotor core 3 is of an eccentric structure; the structure can generate uneven air gaps, so that the motor generates pure string-shaped no-load counter electromotive force; the inner wall of the stator core 1 is movably connected with a rotor core 3, the inner wall of the rotor core 3 is provided with a magnet 4, and the magnet 4 is of a square structure and is used for controlling the material consumption; the structure can reduce material waste and processing difficulty; the rotor core 3 is fixedly connected with the magnets 4, the magnets 4 are distributed at equal intervals in a circular ring shape relative to the inner wall of the rotor core 3, and the magnets 4 are ferrite magnets; the permanent magnet synchronous motor adopts a 10-16 pole scheme, the small pole number is selected with small power, and the multi-pole number is selected with large power; a motor with the center height of 180 ℃ or less can select concentrated windings 2; the distributed winding 2 with the center height of more than 160 is selected, the permanent magnet synchronous motor is manufactured by designing the magnetic circuits of the magnet 4 and the rotor core 3 and replacing the rare earth permanent magnet 4 with ferrite; meanwhile, the pole pair number of the permanent magnet synchronous motor is properly increased, so that the span of the winding 2 is reduced, and the copper consumption of the end part of the winding 2 is reduced.
Referring to FIG. 4, R1 is the radius of the envelope circle of the rotor corresponding to the center O 1 R2 is the radius of the rotor magnetic pole and corresponds to the circle center O 2 。
Working principle: when the rare-earth-free permanent magnet synchronous motor is used, firstly, the device adopts a 10-16 pole scheme, the small power is selected for small pole number, the large power is selected for multi-pole number, and the motor with the center height of less than 180 can select the concentrated winding 2; when the permanent magnet synchronous motor is used, the winding 2 is electrified to generate a rotating magnetic field, the magnet 4 and the driving shaft 6 are driven by magnetic force to synchronously rotate, so that rotation is realized, the magnet 4 of the rotor iron core 3 adopts an eccentric structure, uneven air gaps are generated, the motor further generates pure string-shaped no-load counter electromotive force, the magnet 4 of the rotor iron core 3 adopts a V-shaped structure, the width of the magnetic bridge 5 is not more than 1.0mm, the magnet 4 of the rotor iron core 3 adopts a square structure, material waste is reduced, machining difficulty is reduced, and the permanent magnet synchronous motor is manufactured by designing a magnetic circuit of the magnet 4 of the rotor iron core 3 and utilizing ferrite to replace the rare earth permanent magnet 4; meanwhile, the pole pair number of the permanent magnet synchronous motor is properly increased, so that the span of the winding 2 is reduced, the copper consumption of the end part of the winding 2 is reduced, and through the two points, the ferrite magnet and the multipolar pair number are adopted, so that the cost of the permanent magnet synchronous motor is reduced under the condition that the primary energy efficiency ratio and the characteristics of the permanent magnet synchronous motor are ensured, and the asynchronous motor with the same machine base number and the same power can be replaced.
Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.
Claims (4)
1. The utility model provides a no rare earth's PMSM, includes casing (7), its characterized in that: the rotor is characterized in that a stator core (1) is arranged inside the casing (7), a winding (2) is arranged on the inner wall of the stator core (1), a rotor core (3) is arranged on the inner wall of the winding (2), magnets (4) are distributed at equal intervals in a circular ring shape on the inner wall of the rotor core (3), the magnets (4) are ferrite magnets, a driving shaft (6) is fixedly connected inside the rotor core (3), a magnetic bridge (5) is arranged on the rotor core (3), the width of the magnetic bridge (5) is smaller than 1.0mm, magnets (4) are fixedly connected inside the magnetic bridge (5), and the rotor core (3) is of an eccentric structure.
2. A rare earth-free permanent magnet synchronous motor according to claim 1, characterized in that: the magnet (4) is of a square structure and is used for controlling the material consumption.
3. A rare earth-free permanent magnet synchronous motor according to claim 1, characterized in that: the windings (2) are distributed at equal intervals in a circular ring shape relative to the inner wall of the stator core (1).
4. A rare earth-free permanent magnet synchronous motor according to claim 1, characterized in that: the stator core (1) inner wall is provided with a groove, and a winding (2) is arranged in the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321486622.0U CN220358902U (en) | 2023-06-12 | 2023-06-12 | Rare earth-free permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321486622.0U CN220358902U (en) | 2023-06-12 | 2023-06-12 | Rare earth-free permanent magnet synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220358902U true CN220358902U (en) | 2024-01-16 |
Family
ID=89504901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321486622.0U Active CN220358902U (en) | 2023-06-12 | 2023-06-12 | Rare earth-free permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220358902U (en) |
-
2023
- 2023-06-12 CN CN202321486622.0U patent/CN220358902U/en active Active
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