CN210806886U - Rotor structure of permanent magnet synchronous motor - Google Patents
Rotor structure of permanent magnet synchronous motor Download PDFInfo
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- CN210806886U CN210806886U CN201922414732.6U CN201922414732U CN210806886U CN 210806886 U CN210806886 U CN 210806886U CN 201922414732 U CN201922414732 U CN 201922414732U CN 210806886 U CN210806886 U CN 210806886U
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Abstract
The utility model provides a rotor structure of a permanent magnet synchronous motor, wherein a plurality of V-shaped magnetic steel grooves (1) which extend along the length direction of the rotor and are circumferentially distributed are arranged on the end surface of the rotor, the V-shaped magnetic steel grooves (1) are equidistantly distributed, and the V-shaped opening direction of the V-shaped magnetic steel grooves (1) faces the outer diameter of the rotor; a magnetic steel (2) is arranged in each V-shaped magnetic steel groove (1); a magnetism isolating magnetic bridge (7) is arranged at the vertex angle position corresponding to each V-shaped magnetic steel groove (1), and a first air groove (8) is arranged between every two adjacent V-shaped magnetic steel grooves (1). The utility model discloses can effectively improve the sinusoidal nature of permanent magnetism flux density wave form, reduce the harmonic content in the flux density. In addition, the magnetic circuit of the V-shaped magnetic steel groove can improve the reluctance effect, increase reluctance torque, enhance rotor magnetic flux, reduce iron loss in a high-speed area, reduce torque fluctuation, furthest improve the efficiency of the permanent magnet synchronous motor, save materials and realize low-size high efficiency.
Description
Technical Field
The utility model relates to the technical field of electric machines, specifically, relate to PMSM's rotor structure.
Background
The permanent magnet synchronous motor has the remarkable characteristics of high efficiency, energy conservation, high power density and the like, and is widely applied. Although the stator structure and the manufacturing process of the permanent magnet synchronous motor are similar to those of the asynchronous alternating current motor, the stator structure and the manufacturing process of the permanent magnet synchronous motor are different from those of the asynchronous alternating current motor. The rotor of the permanent magnet synchronous motor has two main structures of an embedded type and a surface-mounted type, the magnetic circuit structure of the rotor is various, and magnetic poles formed by magnetic steel have a one-shaped, a V-shaped, a composite structure and other novel arrangement modes.
The air gap of the existing permanent magnet synchronous motor is similar to that of an asynchronous motor, the sine distortion rate of the permanent magnet flux density waveform is more than twenty percent, a large amount of harmonic waves which influence the performance of the motor are generated during working, and the harmonic waves not only increase the power loss of the motor, but also increase the vibration and noise of the motor.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims at providing a PMSM's rotor structure.
According to the utility model provides a rotor structure of permanent magnet synchronous motor, a plurality of V-shaped magnetic steel grooves which extend along the length direction of the rotor and are circumferentially distributed are arranged on the end surface of the rotor, the V-shaped magnetic steel grooves are equidistantly distributed, and the V-shaped opening direction of the V-shaped magnetic steel grooves faces the outer diameter of the rotor; a magnetic steel is arranged in each V-shaped magnetic steel groove; and a magnetism isolating magnetic bridge is arranged at the vertex angle position corresponding to each V-shaped magnetic steel groove, and a first air groove is arranged between every two adjacent V-shaped magnetic steel grooves.
Optionally, the V-shaped magnetic steel slot comprises a first rectangular slot and a second rectangular slot which are arranged in a splayed manner, wherein one end of the first rectangular slot, which is close to the inner diameter of the rotor, and one end of the second rectangular slot, which is close to the inner diameter of the rotor, are isolated by the magnetic isolation magnetic bridge.
Optionally, the magnetic steel is made of a permanent magnet material.
Optionally, the first air slot is of a circular configuration.
Optionally, the vertical distances from the center of the first air slot to the V-shaped magnetic steel slots on the two sides are equal.
Optionally, the magnetic isolation magnetic bridge is of an arc-shaped triangular structure.
Optionally, the rotor outer diameter is comprised of non-uniform air gap segments.
Optionally, a second air slot 5 is further included, and the second air slot 5 is positioned in the area between the opening of the V-shaped magnet steel slot 1 and the outer diameter of the rotor.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model provides a PMSM's rotor structure can effectively improve the sine of permanent magnetism flux density wave form, reduces the harmonic content in the flux density. In addition, the magnetic circuit of the V-shaped magnetic steel groove can improve the reluctance effect, increase reluctance torque, enhance rotor magnetic flux, reduce iron loss in a high-speed area, reduce torque fluctuation, furthest improve the efficiency of the permanent magnet synchronous motor, save materials and realize low-size high efficiency.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic view of a rotor structure of a permanent magnet synchronous motor provided by the present invention;
in the figure:
1-a V-shaped magnetic steel groove;
2-magnetic steel;
3-included angle of the V-shaped magnetic steel groove;
4-rotor inner diameter;
5-a second air tank;
6-arc outer wall of rotor;
7-magnetic isolation magnetic bridge;
8-first air tank.
Detailed Description
The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
Fig. 1 is a schematic view of a rotor structure of a permanent magnet synchronous motor provided by the present invention, as shown in fig. 1, a plurality of V-shaped magnetic steel grooves 1 extending along a length direction of the rotor and circumferentially distributed are provided on an end surface of the rotor, the V-shaped magnetic steel grooves 1 are equidistantly distributed, and a V-shaped opening direction of the V-shaped magnetic steel grooves 1 faces an outer diameter of the rotor; a magnetic steel 2 is arranged in each V-shaped magnetic steel groove 1; the vertex angle position that every V-arrangement magnet steel groove 1 corresponds is provided with magnetism magnetic bridge 7 that separates, is provided with first air groove 8 between the adjacent V-arrangement magnet steel groove 1. V-arrangement magnetism steel slot 1 is including being first rectangular channel and the second rectangular channel that the splayed set up, and the one end that first rectangular channel is close to the rotor internal diameter and the one end that the second rectangular channel is close to the rotor internal diameter are kept apart through separating magnetism magnetic bridge 7.
In the embodiment, the magnetic circuit of the V-shaped magnetic steel groove 1 can improve the reluctance effect, increase the reluctance torque, enhance the rotor magnetic flux, reduce the iron loss in a high-speed area and reduce the torque fluctuation.
Illustratively, the magnetic isolation magnetic bridge 7 is in an arc-shaped triangular structure.
Specifically, as shown in fig. 1, a triangle-like air slot is arranged at the bottom of the V-shaped magnetic steel slot, two straight-line walls of the air slot are at equal angles with the nearest slot walls of the rectangular magnetic steel slots on two sides, two equal-width straight arms and an equal-width arc-shaped arm jointly form a magnetic isolation magnetic bridge 7, and the walls of the magnetic isolation magnetic bridge 7 are at equal widths, so that magnetic flux leakage can be prevented, magnetic lines of force form a short circuit in the rotor as much as possible, the magnetic lines of force of the magnetic isolation magnetic bridge 7 are saturated, and air gap flux of the air slot is reduced.
In this embodiment, the magnetic steel 2 is made of a permanent magnet material. The magnetic steel 2 can be made of neodymium iron boron permanent magnet 38UH or 38SH, but not limited to this, and other permanent magnet materials can also be made into the magnetic steel 2.
Illustratively, the first air slot 8 is of circular configuration. The vertical distances from the circle center of the first air slot 8 to the V-shaped magnetic steel slots 1 on the two sides are equal. The first air slot 8 facilitates ventilation and reduces the effect of rotational inertia. Finally, the V-shaped magnetic steel arrangement can increase reluctance torque, enhance rotor magnetic flux, reduce iron loss in a high-speed area, reduce torque fluctuation and the like.
In this embodiment, the rotor outer diameter is comprised of non-uniform air gap segments. The rotor outer diameter is in a segmented arc shape and is approximately circular, so that a non-uniform air gap of the rotor is formed, and the cogging torque and the torque pulsation are favorably reduced.
In this embodiment, a second air slot 5 is further included, and the second air slot 5 is located in the region between the opening of the V-shaped magnet steel slot 1 and the outer diameter of the rotor. The second air groove 5 can increase the salient pole ratio and increase the magnetic resistance effect;
specifically, as shown in fig. 1, the outer wall of the rotor is of an approximately circular structure, specifically, the position of the outer wall of the rotor corresponding to the center position of the second air slot 5 is relatively convex relative to the outer wall portions of the rotor at two sides thereof, so as to form a minimum air gap, where the magnetic resistance is minimum, the magnetic flux is maximum, the position of the non-uniform air gap and a specific air gap ratio are provided, so that some harmonics harmful to the motor can be eliminated, and the loss, temperature rise and noise of the motor can be effectively reduced. And corresponding V-shaped magnetic circuit structures and triangle-like air grooves are added, so that the salient pole ratio of the rotor is further increased, the reluctance effect is improved, the reluctance torque is increased, the rotor magnetic flux is enhanced, the iron loss in a high-speed area is reduced, and the torque fluctuation is reduced.
The rotor structure of the permanent magnet synchronous motor provided by the embodiment can effectively improve the sine of the permanent magnet flux density waveform and reduce the harmonic content in the flux density. In addition, the magnetic circuit of the V-shaped magnetic steel groove can improve the reluctance effect, increase reluctance torque, enhance rotor magnetic flux, reduce iron loss in a high-speed area, reduce torque fluctuation, furthest improve the efficiency of the permanent magnet synchronous motor, save materials and realize low-size high efficiency.
The utility model also provides a PMSM, including stator and rotor, the rotor external diameter is the segmentation circular arc. The rotor is provided with a rotating shaft which is a magnetic conductive shaft.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (8)
1. The rotor structure of the permanent magnet synchronous motor is characterized in that a plurality of V-shaped magnetic steel grooves (1) which extend along the length direction of the rotor and are circumferentially distributed are arranged on the end face of the rotor, the V-shaped magnetic steel grooves (1) are distributed at equal intervals, and the V-shaped openings of the V-shaped magnetic steel grooves (1) face the outer diameter of the rotor; a magnetic steel (2) is arranged in each V-shaped magnetic steel groove (1); a magnetism isolating magnetic bridge (7) is arranged at the vertex angle position corresponding to each V-shaped magnetic steel groove (1), and a first air groove (8) is arranged between every two adjacent V-shaped magnetic steel grooves (1).
2. The rotor structure of a permanent magnet synchronous motor according to claim 1, characterized in that the V-shaped magnet steel slots (1) comprise a first rectangular slot and a second rectangular slot arranged in a splayed shape, and one end of the first rectangular slot close to the inner diameter of the rotor is separated from one end of the second rectangular slot close to the inner diameter of the rotor by the magnetic isolation magnetic bridge (7).
3. Rotor structure of a permanent magnet synchronous machine according to claim 1, characterized in that the magnet steel (2) is made of permanent magnet material.
4. Rotor structure of a permanent magnet synchronous machine according to claim 1, characterized in that the first air slot (8) is of circular configuration.
5. The rotor structure of a permanent magnet synchronous motor according to claim 4, characterized in that the vertical distance from the center of the first air slot (8) to the V-shaped magnetic steel slots (1) on both sides is equal.
6. The rotor structure of a permanent magnet synchronous motor according to claim 1, characterized in that the magnetic isolation bridges (7) are of an arc-shaped triangular structure.
7. The rotor structure of a permanent magnet synchronous motor according to claim 1, characterized in that the rotor outer diameter is composed of non-uniform air gap segments.
8. The rotor structure of a permanent magnet synchronous machine according to any of claims 1-7, characterized by further comprising a second air slot (5), said second air slot (5) being located in the area between the opening of the V-shaped magnet steel slot (1) and the outer diameter of the rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922414732.6U CN210806886U (en) | 2019-12-26 | 2019-12-26 | Rotor structure of permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922414732.6U CN210806886U (en) | 2019-12-26 | 2019-12-26 | Rotor structure of permanent magnet synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210806886U true CN210806886U (en) | 2020-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922414732.6U Active CN210806886U (en) | 2019-12-26 | 2019-12-26 | Rotor structure of permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210806886U (en) |
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2019
- 2019-12-26 CN CN201922414732.6U patent/CN210806886U/en active Active
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