CN212343460U - Permanent magnet hybrid magnetizing rotor and motor - Google Patents
Permanent magnet hybrid magnetizing rotor and motor Download PDFInfo
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- CN212343460U CN212343460U CN202021178597.6U CN202021178597U CN212343460U CN 212343460 U CN212343460 U CN 212343460U CN 202021178597 U CN202021178597 U CN 202021178597U CN 212343460 U CN212343460 U CN 212343460U
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Abstract
The utility model discloses a permanent magnet mixes rotor that magnetizes, include: the magnetic steel structure comprises a rotating shaft, an inner iron core, strip-shaped magnetic steel, arc-shaped magnetic steel, an outer iron core, a front end cover and a rear end cover; the strip-shaped magnetic steels are arranged on the outer cylindrical surface of the inner iron core in a circumferential array; the arc-shaped magnetic steels are distributed among the strip-shaped magnetic steels, the arc-shaped magnetic steels are arranged along the circumferential direction of the inner iron core, and the circle centers of the arc-shaped magnetic steels are superposed with the circle center of the inner iron core; the outer side of the outer iron core is cylindrical, and the inner side of the outer iron core is in concave-convex fit with the strip-shaped magnetic steel and the arc-shaped magnetic steel; the inner iron core, the strip-shaped magnetic steel, the arc-shaped magnetic steel and the outer iron core are fixed into an integral structure. Because arc-shaped magnetic steel and strip-shaped magnetic steel are arranged along the circumference of the inner iron core in a reverse and alternate mode, the arc-shaped magnetic steel forms a complete magnetic loop through the outer iron core, the motor stator, the strip-shaped magnetic steel and the inner iron core to reduce external magnetic leakage.
Description
Technical Field
The utility model belongs to the technical field of the motor, specifically a permanent magnet mixes rotor and motor that magnetizes.
Background
The permanent magnet synchronous motor mainly comprises a rotor, an end cover, a stator and other parts. The stator structure of a permanent magnet synchronous motor is very similar to that of a common induction motor, the rotor structure is different from that of an asynchronous motor in that a high-quality permanent magnet magnetic pole is placed on a rotor, and the permanent magnet synchronous motor is generally divided into a surface type rotor structure and a built-in type rotor structure according to the position of the permanent magnet placed on the rotor. The placement of the permanent magnets has a significant impact on the motor performance. The surface type rotor structure-permanent magnet is positioned on the outer surface of a rotor iron core, the rotor structure is simple, but the generated asynchronous torque is very small, and the rotor structure is only suitable for occasions with low starting requirements and is rarely applied. The built-in rotor structure, namely the permanent magnet is positioned in the iron core between the squirrel cage conducting bar and the rotating shaft, the starting performance is good, and most of the permanent magnet synchronous motors at present adopt the structure.
However, the built-in permanent magnet synchronous motor has poor quadrature-direct axis inductance, certain reluctance torque and good weak magnetic performance, but generates large magnetic leakage; the existing built-in permanent magnet motor mainly adopts a single magnetic steel form and has certain defects. The magnetic leakage of the motor rotor is increased, the air gap flux density is lower, and the torque/power density of the motor is reduced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application solves the technical problem of magnetic leakage of the existing built-in permanent magnet synchronous motor by providing the permanent magnet hybrid magnetizing rotor and the motor.
The embodiment of the application provides a permanent magnet mixes rotor that magnetizes, includes: a rotating shaft;
the inner iron core is sleeved on the rotating shaft and is fixedly connected with the rotating shaft;
a plurality of strip-shaped magnetic steels are arranged on the outer cylindrical surface of the inner iron core in a circumferential array, and each strip-shaped magnetic steel is arranged along the radial direction of the inner iron core;
a plurality of arc-shaped magnetic steels distributed among the strip-shaped magnetic steels, wherein the arc-shaped magnetic steels are arranged along the circumferential direction of the inner iron core, and the circle centers of the arc-shaped magnetic steels are superposed with the circle center of the inner iron core;
the outer side of the outer iron core is cylindrical, and the inner side of the outer iron core is in concave-convex fit with the strip-shaped magnetic steel and the arc-shaped magnetic steel;
a front end cap and a rear end cap;
the inner iron core, the strip-shaped magnetic steel, the arc-shaped magnetic steel and the outer iron core are fixed into an integral structure, and the front end cover and the rear end cover are respectively pressed at two ends of the integral structure.
The arc-shaped magnetic steels are magnetized in the radial direction, and the magnetizing directions of two adjacent arc-shaped magnetic steels are opposite; the bar-shaped magnetic steels are magnetized in a tangential direction, and the magnetizing directions of two adjacent bar-shaped magnetic steels are opposite.
Defining the pole arc coefficient generated by the combination of the strip-shaped magnetic steel and the arc-shaped magnetic steel asα p1 Conversion to polar arc angleθ 1Angle of polar arcθ 1Satisfy 3/4 & tau<θ 1<5/6 · τ, where τ =180 °/P, P being the number of motor poles.
The arc-shaped magnetic steel and the strip-shaped magnetic steel are arranged in pairs and are even groups. The two ends of the arc-shaped magnetic steel are tightly attached to the side faces of the strip-shaped magnetic steel.
And a carbon fiber protective sleeve is arranged on the periphery of the outer iron core. The carbon fiber protective sleeve can further enhance the structural strength of the rotor, resist the centrifugal force of the high-speed running rotor and protect the inner iron core, the outer iron core, the bar-shaped magnetic steel and the arc-shaped magnetic steel.
And the radial outer side of the strip-shaped magnetic steel is provided with an arc-shaped retaining wedge.
The inner iron core and the outer iron core are respectively provided with a through hole, a pull rod penetrates through the through holes, and two ends of the pull rod are respectively fixedly connected with the front end cover and the rear end cover to fix the stator and the rotor into a whole.
The front end cover, the rear end cover and the pull rod are made of insulating and magnetism-isolating materials.
A permanent magnet hybrid magnetizing motor comprises a stator and the rotor, wherein the rotor is rotatably connected with the stator.
The utility model has the advantages that: because arc-shaped magnetic steel and strip-shaped magnetic steel are arranged along the circumference of the inner iron core in a reverse and alternate mode, the arc-shaped magnetic steel forms a complete magnetic loop through the outer iron core, the motor stator, the strip-shaped magnetic steel and the inner iron core to reduce external magnetic leakage. All the magnetic steels are made of neodymium iron boron materials with constant polarity, and the magnetic steels positioned at the radial magnetic circuit position are used as main excitation to provide air gap main magnetic flux, so that the high power density of the motor is ensured. The tangential magnetic field and the main magnetic field act together to gather the magnetic field at the rotor side, so that the magnetic field is obviously enhanced compared with the common structure, and finally, the air gap flux density is improved.
Drawings
FIG. 1 is a schematic view of a rotor in accordance with embodiment 1;
FIG. 2 is a perspective view of a rotor of embodiment 1;
FIG. 3 is an assembly view of the rotor of embodiment 1;
FIG. 4 is an exploded view of a rotor according to example 1;
FIG. 5 is a perspective view of a rotor according to embodiment 2;
FIG. 6 is a graph of air gap flux density comparison for rotors of different configurations.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Example 1
As shown in fig. 1 to 4, a permanent magnet hybrid magnetizing rotor includes: pivot, inner core 1, bar magnet steel 3, arc magnet steel 4, outer iron core 2, front end housing 7 and rear end housing 8.
The inner iron core 1 is sleeved on the rotating shaft, and the inner iron core 1 is fixedly connected with the rotating shaft;
a plurality of strip-shaped magnetic steels 3 are arranged on the outer cylindrical surface of the inner iron core 1 in a circumferential array, and each strip-shaped magnetic steel 3 is arranged along the radial direction of the inner iron core 1; and the radial outer side of the strip-shaped magnetic steel 3 is provided with an arc-shaped stop wedge 5.
A plurality of arc-shaped magnetic steels 4 are distributed among the strip-shaped magnetic steels 3, the arc-shaped magnetic steels 4 are arranged along the circumferential direction of the inner iron core 1, and the circle centers of the arc-shaped magnetic steels are superposed with the circle center of the inner iron core 1; the arc-shaped magnetic steel 4 and the strip-shaped magnetic steel 3 are arranged in pairs and are even groups. The two ends of the arc-shaped magnetic steel 4 are tightly attached to the side faces of the strip-shaped magnetic steel 3.
The outer side of the outer iron core 2 is cylindrical, and the inner side of the outer iron core is in concave-convex fit with the strip-shaped magnetic steel 3 and the arc-shaped magnetic steel 4; and a carbon fiber protective sleeve is arranged on the periphery of the outer iron core. The carbon fiber protective sleeve can further enhance the structural strength of the rotor, resist the centrifugal force of the rotor running at high speed and protect the inner iron core 1, the outer iron core 2, the bar-shaped magnetic steel 3 and the arc-shaped magnetic steel 4.
The inner iron core 1, the strip-shaped magnetic steel 3, the arc-shaped magnetic steel 4 and the outer iron core 2 are fixed into an integral structure, and the front end cover 7 and the rear end cover 8 are respectively pressed at two ends of the integral structure. The front end cover 7, the rear end cover 8 and the pull rod 9 are made of insulating and magnetism-isolating materials.
All be equipped with the through-hole on interior iron core 1 and the outer iron core 2, wear to be equipped with pull rod 9 in the through-hole, the both ends of pull rod 9 respectively with front end housing 7 and 8 fixed connection of rear end housing fix stator rotor as a whole.
The arc-shaped magnetic steels 4 are magnetized in the radial direction, and the magnetizing directions of two adjacent arc-shaped magnetic steels 4 are opposite; the bar-shaped magnetic steels 3 are magnetized tangentially, and the magnetizing directions of the two adjacent bar-shaped magnetic steels 3 are opposite.
Defining the pole arc coefficient generated by the combination of the strip-shaped magnetic steel 3 and the arc-shaped magnetic steel 4 asα p1 Conversion to polar arc angleθ 1Angle of polar arcθ 1Equal to the product of the angle occupied by each pole and the pole arc coefficient, the pole arc angleθ 1Satisfy 3/4 & tau<θ 1<5/6 · τ, where τ =180 °/P, P being the number of motor poles. Under the condition of meeting the requirement of the polar arc angle, the optimal values of the air gap flux density, the total weight and other properties of the motor exist.
Because arc magnet steel 4 and bar magnet steel 3 are arranged along the circumference of the inner iron core 1 in a reverse and alternate manner, the arc magnet steel 4 forms a complete magnetic loop through the outer iron core, the motor stator, the bar magnet steel 3 and the inner iron core to reduce external magnetic flux leakage. The self-shielding effect generated by the magnetic steel structure formed by combining the strip-shaped magnetic steel 3 and the arc-shaped magnetic steel 4 can obviously enhance the magnetic field on one side of the magnetic steel, and obviously weaken the magnetic field on the other side of the magnetic steel. By adopting the arrangement mode, the magnetic flux density on the air gap side can be greatly increased, and the magnetic flux of the yoke part of the rotor is reduced, so that the size and the weight of the motor can be reduced, and the power density of the electric push rod is effectively improved. Each magnet is an array structure consisting of two arc-shaped magnetic steels 4 with different magnetization directions and a strip-shaped magnetic steel 3, and the magnetic field of the inner hole of the rotor is very weak. Because rotor yoke portion magnetic flux is showing and is reducing, can reduce rotor yoke portion ferromagnetic material thickness, even need not the rotor yoke, can reduce rotor weight and inertia, promote system quick response nature. The working point is higher due to the fact that the magnets are magnetized in different directions, generally exceeding 0.9, and the utilization rate of the water magnetic material is improved. The arc-shaped magnetic steel 4 positioned at the radial magnetic circuit position adopts neodymium iron boron materials with constant polarity as main excitation to provide air gap main magnetic flux, thereby ensuring the high power density of the motor.
Another feature is that the flux density distribution in the air gap is made to approximate a sine wave, which helps to reduce cogging torque and torque ripple. The harmonic content is low, fractional slot concentrated winding can be adopted, and the stator does not need to adopt an inclined slot. As shown in FIG. 6, a comparison graph of the air gap flux densities of rotors with different structures is obtained through experimental data. The tangential magnetic field and the main magnetic field act together to gather the magnetic field at the rotor side, so that the magnetic field is obviously enhanced compared with the common structure, and finally, the air gap flux density is improved.
Example 2
As shown in fig. 5, the difference from embodiment 1 lies in that two parallel "i" shaped slots are radially disposed between the inner core 1 and the outer core 2 to segment the arc-shaped magnetic steel, and then the rotor inner core 1 and the rotor outer core 2 are drawn together in the slots by using the i-shaped member 10 made of stainless steel material, thereby fixing the bar-shaped magnetic steel and the arc-shaped magnetic steel. The strip-shaped magnetic steel is fixed by the rotor outer iron core, so that the strip-shaped magnetic steel cannot be separated when the motor runs at a high speed.
The embodiment of the application also provides a permanent magnet hybrid magnetizing motor, which comprises a stator 11 and the rotor, wherein the rotor is rotatably connected with the stator 11.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but rather is described in the embodiments and descriptions herein to illustrate the principles of the invention and that various changes and modifications may be made without departing from the spirit and scope of the invention, all of which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents.
In the description of the present invention, it should be understood that the terms "front", "back", "left", "right", "center", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the scope of the present invention.
Claims (10)
1. A permanent magnet hybrid magnetizing rotor, comprising:
a rotating shaft;
the inner iron core is sleeved on the rotating shaft and is fixedly connected with the rotating shaft;
a plurality of strip-shaped magnetic steels are arranged on the outer cylindrical surface of the inner iron core in a circumferential array, and each strip-shaped magnetic steel is arranged along the radial direction of the inner iron core;
a plurality of arc-shaped magnetic steels distributed among the strip-shaped magnetic steels, wherein the arc-shaped magnetic steels are arranged along the circumferential direction of the inner iron core, and the circle centers of the arc-shaped magnetic steels are superposed with the circle center of the inner iron core;
the outer side of the outer iron core is cylindrical, and the inner side of the outer iron core is in concave-convex fit with the strip-shaped magnetic steel and the arc-shaped magnetic steel;
a front end cap and a rear end cap;
the inner iron core, the strip-shaped magnetic steel, the arc-shaped magnetic steel and the outer iron core are fixed into an integral structure, and the front end cover and the rear end cover are respectively pressed at two ends of the integral structure.
2. The permanent magnet hybrid magnetizing rotor of claim 1, wherein: the arc-shaped magnetic steels are magnetized in the radial direction, and the magnetizing directions of two adjacent arc-shaped magnetic steels are opposite; the bar-shaped magnetic steels are magnetized in a tangential direction, and the magnetizing directions of two adjacent bar-shaped magnetic steels are opposite.
3. The permanent magnet hybrid magnetizing rotor of claim 2, wherein: defining the pole arc coefficient generated by the combination of the strip-shaped magnetic steel and the arc-shaped magnetic steel asα p1 Conversion to polar arc angleθ 1Angle of polar arcθ 1Satisfy 3/4 & tau<θ 1<5/6 · τ, where τ =180 °/P, P being the number of motor poles.
4. The permanent magnet hybrid magnetizing rotor of claim 3, wherein: the arc-shaped magnetic steel and the strip-shaped magnetic steel are arranged in pairs and are even groups.
5. The permanent magnet hybrid magnetizing rotor of claim 4, wherein: the two ends of the arc-shaped magnetic steel are tightly attached to the side faces of the strip-shaped magnetic steel.
6. The permanent magnet hybrid magnetizing rotor of claim 1, wherein: and a carbon fiber protective sleeve is arranged on the periphery of the outer iron core.
7. The permanent magnet hybrid magnetizing rotor of claim 1, wherein: and the radial outer side of the strip-shaped magnetic steel is provided with an arc-shaped retaining wedge.
8. The permanent magnet hybrid charging rotor according to any one of claims 1 to 7, wherein: the inner iron core and the outer iron core are respectively provided with a through hole, a pull rod penetrates through the through holes, and two ends of the pull rod are respectively fixedly connected with the front end cover and the rear end cover.
9. The permanent magnet hybrid magnetizing rotor of claim 8, wherein: the front end cover, the rear end cover and the pull rod are made of insulating and magnetism-isolating materials.
10. A permanent magnet hybrid magnetizing motor is characterized in that: comprising a stator and a rotor according to any one of claims 1 to 9, the rotor being rotatably connected to the stator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021178597.6U CN212343460U (en) | 2020-06-23 | 2020-06-23 | Permanent magnet hybrid magnetizing rotor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021178597.6U CN212343460U (en) | 2020-06-23 | 2020-06-23 | Permanent magnet hybrid magnetizing rotor and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212343460U true CN212343460U (en) | 2021-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021178597.6U Active CN212343460U (en) | 2020-06-23 | 2020-06-23 | Permanent magnet hybrid magnetizing rotor and motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212343460U (en) |
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2020
- 2020-06-23 CN CN202021178597.6U patent/CN212343460U/en active Active
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Address after: No. 200, Xiaolingwei street, Xuanwu District, Nanjing City, Jiangsu Province Patentee after: NANJING University OF SCIENCE AND TECHNOLOGY Patentee after: Zhengzhou Foguang power generation equipment Co.,Ltd. Address before: No. 200, Xiaolingwei street, Xuanwu District, Nanjing City, Jiangsu Province Patentee before: NANJING University OF SCIENCE AND TECHNOLOGY Patentee before: ZHENGZHOU FOGUANG POWER GENERATION EQUIPMENT Co.,Ltd. |