CN214337668U - Permanent magnet motor and permanent magnet motor rotor - Google Patents
Permanent magnet motor and permanent magnet motor rotor Download PDFInfo
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- CN214337668U CN214337668U CN202022673721.2U CN202022673721U CN214337668U CN 214337668 U CN214337668 U CN 214337668U CN 202022673721 U CN202022673721 U CN 202022673721U CN 214337668 U CN214337668 U CN 214337668U
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Abstract
The utility model relates to the field of electric machines, in particular to permanent-magnet machine and permanent-magnet machine rotor. The permanent magnet motor rotor comprises a rotor iron core and a magnetic steel group, wherein the magnetic steel group comprises a first magnetic steel, a second magnetic steel, a third magnetic steel and a fourth magnetic steel, and the remanence density of the second magnetic steel is greater than that of the first magnetic steel; the remanence of the third magnetic steel is larger than that of the fourth magnetic steel; the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel are arranged in a V shape; the magnetic field distribution of the permanent magnet motor with the built-in magnetic steel is mainly determined by the remanence characteristic of the magnetic steel, and the magnetic steel with different remanence characteristics is adopted, so that the residual magnetic density of the two magnetic steels in the middle is higher, and the residual magnetic density of the two magnetic steels at the outer side is lower, a rotor magnetic field which is closer to sinusoidal distribution can be generated, the harmonic content of a counter potential waveform is reduced, the influence on the motor performance is reduced, and the technical problem that the higher harmonic in the current permanent magnet motor magnetic field waveform has a larger influence on the motor performance is solved.
Description
Technical Field
The utility model relates to the field of electric machines, in particular to permanent-magnet machine and permanent-magnet machine rotor.
Background
The permanent magnet motor has the characteristics of high efficiency, high torque density, high torque-current ratio, low maintenance cost and the like, and is widely applied to the high-performance driving fields of electric automobiles, digital control devices and the like. Built-in magnet steel formula permanent-magnet machine can utilize reluctance torque to further improve motor torque, and most built-in magnet steel formula permanent-magnet machine generally adopts V-arrangement magnet steel at present, as shown in fig. 1 to 3, permanent-magnet machine rotor includes rotor core 101, magnet steel 102, strengthening rib 103, separates magnetic bridge 104, and wherein magnet steel 102 is used for providing the magnetic field, produces moment of torsion and power with stator current interact, and rotor core 101 provides the route for the magnetic field that magnet steel 102 produced, and the rotor strength under the high rotational speed centrifugal force state is guaranteed to strengthening rib 103, separates magnetic bridge 104 and utilizes silicon steel sheet saturation to produce high reluctance, weakens interelectrode magnetic leakage. Because the magnetic resistance on the surface of the rotor is unevenly distributed, the magnetic field waveform of the rotor of the motor contains a large number of higher harmonics, which can have the following adverse effects on the motor: 1) the motor generates large torque fluctuation; 2) high-frequency magnetic fields generated in the motor iron core are alternated, so that the iron loss is increased, and the motor efficiency is reduced; 3) the motor generates larger vibration and noise; 4) the control accuracy of the driving system is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a permanent magnet motor rotor, which is used for solving the technical problem that a large amount of higher harmonics in the magnetic field waveform of the current permanent magnet motor greatly influence the performance of the motor; in addition, the utility model also aims at providing an use permanent-magnet machine of above-mentioned permanent-magnet machine rotor.
The utility model discloses a permanent-magnet machine rotor adopts following technical scheme:
the permanent magnet motor rotor includes:
a rotor core;
the magnetic steel group comprises a first magnetic steel, a second magnetic steel, a third magnetic steel and a fourth magnetic steel;
the first magnetic steel and the second magnetic steel are embedded in the rotor core and are arranged at intervals in a straight line shape, the remanence density of the second magnetic steel is larger than that of the first magnetic steel, the distance between the first magnetic steel and the center of the rotor core is larger than that between the second magnetic steel and the center of the rotor core, and the magnetizing directions of the first magnetic steel and the second magnetic steel are both vertical to the arrangement direction of the first magnetic steel and the second magnetic steel and vertical to the axial extension direction of the rotor core;
the third magnetic steel and the fourth magnetic steel are embedded in the rotor core and are arranged at intervals in a straight line shape, the remanence density of the third magnetic steel is larger than that of the fourth magnetic steel, the distance between the fourth magnetic steel and the center of the rotor core is larger than that between the third magnetic steel and the center of the rotor core, and the magnetizing directions of the third magnetic steel and the fourth magnetic steel are both vertical to the arrangement direction of the third magnetic steel and the fourth magnetic steel and vertical to the axial extension direction of the rotor core;
the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel are arranged in a V shape with openings back to the center of the rotor core;
the magnetic steel groups are arranged in multiple groups and are arranged along the circumferential direction of the rotor core.
Has the advantages that: the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel are V-shaped, openings of the V-shaped openings face away from the center of the rotor core, the magnetic field distribution of the built-in magnetic steel type permanent magnet motor mainly has the remanence characteristic of the magnetic steel to determine, the magnetic steels with different remanence characteristics are adopted, the second magnetic steel and the third magnetic steel are arranged in the middle of the magnetic steel group, the first magnetic steel and the fourth magnetic steel are arranged in the outer side of the magnetic steel group, the residual magnetic density of the middle magnetic steel is higher, the residual magnetic density of the outer side is lower, and therefore the rotor magnetic field which is closer to the sinusoidal distribution can be generated. Because the counter electromotive force of the motor is mainly generated in the stator winding by the rotation of the rotor magnetic field, the sine degree of the counter electromotive force of the motor can be improved by improving the sine degree of the rotor magnetic field, so that the harmonic content of the counter electromotive force waveform is reduced, the influence on the performance of the motor is reduced, and the technical problem that the higher harmonic in the current permanent magnet motor magnetic field waveform has a large influence on the performance of the motor is solved.
Further, the rotor core is provided with magnetic steel grooves corresponding to the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel one to one, the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel are embedded in the corresponding magnetic steel grooves, and reinforcing ribs are formed between the adjacent magnetic steel grooves. The strength of the rotor is improved through the reinforcing ribs.
Furthermore, all the magnetic steel groups are uniformly arranged along the circumferential direction of the rotor core. Further improving the sine degree of the rotor magnetic field.
Furthermore, the thicknesses of the first magnetic steel and the second magnetic steel in the magnetizing direction are the same, so that the rotor core is convenient to machine, and meanwhile, the rotor core is convenient to install.
Further, the remanence of the third magnetic steel is equal to the remanence of the second magnetic steel, and the remanence of the fourth magnetic steel is equal to the remanence of the first magnetic steel. Further improving the sine degree of the rotor magnetic field.
Furthermore, the first magnetic steel and the second magnetic steel have equal sizes in the direction of the interval arrangement of the first magnetic steel and the second magnetic steel. As for the magnetic steels with the same magnetic performance, the generated magnetic flux is mainly related to the length of the magnetic steel perpendicular to the magnetizing direction, and the sizes of the first magnetic steel and the second magnetic steel in the direction of the interval arrangement of the first magnetic steel and the second magnetic steel are equal, so that the sine degree of the magnetic field of the rotor is further improved.
Furthermore, the first magnetic steel and the fourth magnetic steel are symmetrically arranged, the second magnetic steel and the third magnetic steel are symmetrically arranged, and the symmetry plane of the first magnetic steel and the symmetry plane of the fourth magnetic steel are superposed on the symmetry plane of the second magnetic steel and the symmetry plane of the third magnetic steel. The symmetrical structure is convenient to install, and simultaneously, the sine degree of the rotor magnetic field is further improved.
The utility model discloses permanent-magnet machine's technical scheme:
permanent-magnet machine includes electric motor rotor and motor stator, and electric motor rotor includes:
a rotor core;
the magnetic steel group comprises first magnetic steel, second magnetic steel, third magnetic steel and fourth magnetic steel:
the first magnetic steel and the second magnetic steel are embedded in the rotor core and are arranged at intervals in a straight line shape, the remanence density of the second magnetic steel is larger than that of the first magnetic steel, the distance between the first magnetic steel and the center of the rotor core is larger than that between the second magnetic steel and the center of the rotor core, and the magnetizing direction of the first magnetic steel and the magnetizing direction of the second magnetic steel are both vertical to the arrangement direction of the first magnetic steel and the magnetizing direction of the second magnetic steel and are vertical to the extension direction of the axis of the rotor core;
the third magnetic steel and the fourth magnetic steel are embedded in the rotor core and are arranged at intervals in a straight line shape, the remanence density of the third magnetic steel is larger than that of the fourth magnetic steel, the distance between the fourth magnetic steel and the center of the rotor core is larger than that between the third magnetic steel and the center of the rotor core, and the magnetizing directions of the third magnetic steel and the fourth magnetic steel are both vertical to the arrangement direction of the third magnetic steel and the fourth magnetic steel and vertical to the axial extension direction of the rotor core;
the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel are arranged in a V shape with openings back to the center of the rotor core;
the magnetic steel groups are arranged in multiple groups and are arranged along the circumferential direction of the rotor core.
Has the advantages that: the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel are V-shaped, openings of the V-shaped openings face away from the center of the rotor core, the magnetic field distribution of the built-in magnetic steel type permanent magnet motor mainly has the remanence characteristic of the magnetic steel to determine, the magnetic steels with different remanence characteristics are adopted, the second magnetic steel and the third magnetic steel are arranged in the middle of the magnetic steel group, the first magnetic steel and the fourth magnetic steel are arranged in the outer side of the magnetic steel group, the residual magnetic density of the middle magnetic steel is higher, the residual magnetic density of the outer side of the magnetic steel is lower, and therefore the rotor magnetic field which is closer to sinusoidal distribution can be generated. Because the counter electromotive force of the motor is mainly generated in the stator winding by the rotation of the rotor magnetic field, the sine degree of the counter electromotive force of the motor can be improved by improving the sine degree of the rotor magnetic field, so that the harmonic content of the counter electromotive force waveform is reduced, the influence on the performance of the motor is reduced, and the technical problem that the higher harmonic in the current permanent magnet motor magnetic field waveform has a large influence on the performance of the motor is solved.
Further, the rotor core is provided with magnetic steel grooves corresponding to the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel one to one, the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel are embedded in the corresponding magnetic steel grooves, and reinforcing ribs are formed between the adjacent magnetic steel grooves. The strength of the rotor is improved through the reinforcing ribs.
Furthermore, all the magnetic steel groups are uniformly arranged along the circumferential direction of the rotor core. Further improving the sine degree of the rotor magnetic field.
Furthermore, the thicknesses of the first magnetic steel and the second magnetic steel in the magnetizing direction are the same, so that the rotor core is convenient to machine, and meanwhile, the rotor core is convenient to install.
Further, the remanence of the third magnetic steel is equal to the remanence of the second magnetic steel, and the remanence of the fourth magnetic steel is equal to the remanence of the first magnetic steel. Further improving the sine degree of the rotor magnetic field.
Furthermore, the first magnetic steel and the second magnetic steel have equal sizes in the direction of the interval arrangement of the first magnetic steel and the second magnetic steel. As for the magnetic steels with the same magnetic performance, the generated magnetic flux is mainly related to the length of the magnetic steel perpendicular to the magnetizing direction, and the sizes of the first magnetic steel and the second magnetic steel in the direction of the interval arrangement of the first magnetic steel and the second magnetic steel are equal, so that the sine degree of the magnetic field of the rotor is further improved.
Furthermore, the first magnetic steel and the fourth magnetic steel are symmetrically arranged, the second magnetic steel and the third magnetic steel are symmetrically arranged, and the symmetry plane of the first magnetic steel and the symmetry plane of the fourth magnetic steel are superposed on the symmetry plane of the second magnetic steel and the symmetry plane of the third magnetic steel. The symmetrical structure is convenient to install, and simultaneously, the sine degree of the rotor magnetic field is further improved.
Drawings
FIG. 1 is a partial structural schematic diagram of a permanent magnet motor rotor with built-in magnetic steel in the prior art;
FIG. 2 is a schematic diagram of a UVW three-phase counter potential waveform of a permanent magnet motor with built-in magnetic steel in the prior art;
FIG. 3 is a schematic diagram of a cogging torque waveform of a permanent magnet motor with built-in magnetic steel in the prior art;
fig. 4 is a schematic view of a partial structure of a permanent magnet motor rotor with built-in magnetic steel according to embodiment 1 of the present invention;
fig. 5 is a schematic view of a UVW three-phase counter potential waveform of a permanent magnet motor with built-in magnetic steel in embodiment 1 of the permanent magnet motor rotor of the present invention;
fig. 6 is a schematic view of a cogging torque waveform of a permanent magnet motor with a built-in magnetic steel in embodiment 1 of the permanent magnet motor rotor of the present invention;
in fig. 1 to 3: 101. a rotor core; 102. magnetic steel; 103. reinforcing ribs; 104. a magnetic isolation bridge;
in fig. 4 to 6: 1. a rotor core; 2. a magnetic steel group; 3. a first magnetic steel; 4. a second magnetic steel; 5. a third magnetic steel; 6. a fourth magnetic steel; 7. a magnetic steel groove; 8. and (5) reinforcing ribs.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships that are assumed to be merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The features and properties of the present invention are described in further detail below with reference to examples.
The utility model discloses permanent-magnet machine rotor's concrete embodiment 1:
as shown in fig. 4 to 6, the permanent magnet motor rotor includes rotor core 1, magnet steel group 2 includes first magnet steel 3, second magnet steel 4, third magnet steel 5 and fourth magnet steel 6, be equipped with on rotor core 1 with first magnet steel 3, second magnet steel 4, the magnet steel groove 7 of third magnet steel 5 and the 6 one-to-one of fourth magnet steel, first magnet steel 3, second magnet steel 4, third magnet steel 5 and fourth magnet steel 6 inlay in the magnet steel groove 7 that corresponds, be formed with strengthening rib 8 between the adjacent magnet steel groove 7, strengthening rib 8 improves rotor core 1's intensity, guarantee rotor core 1's stability under the high rotational speed state. The strengthening rib 8 still forms the magnetic isolation bridge between the adjacent magnet steel, and the width of magnetic isolation bridge is less, can restrict the magnetic leakage flux more, reduces the magnetic leakage flux, but the magnetic bridge width is less, and mechanical strength is worse, and the processing degree of difficulty is also more big.
The magnetic steel group 2 is provided with a plurality of groups, and the plurality of groups of magnetic steel groups 2 are uniformly arranged in the circumferential direction of the rotor core 1, so that the sine degree of the rotor magnetic field is further improved.
In this embodiment, the first magnetic steel 3 and the second magnetic steel 4 are arranged in a line shape at intervals, the first magnetic steel 3 and the second magnetic steel 4 are separated by the reinforcing rib 8, and the first magnetic steel 3 is located outside the second magnetic steel 4, that is, the distance between the center of the first magnetic steel 3 and the center of the rotor core 1 is greater than the distance between the second magnetic steel 4 and the center of the rotor core 1. The third magnet steel 5 and the fourth magnet steel 6 are arranged in the same manner as the above, the third magnet steel 5 and the fourth magnet steel 6 are arranged in a linear shape at intervals, the third magnet steel 5 and the fourth magnet steel 6 are also separated by the reinforcing rib 8, the fourth magnet steel 6 is positioned outside the third magnet steel 5, namely, the distance between the center of the fourth magnet steel 6 and the center of the rotor core 1 is larger than the distance between the third magnet steel 5 and the center of the rotor core 1. The rotor strength is improved by the reinforcing ribs 8.
The remanence density of the second magnetic steel 4 is larger than that of the first magnetic steel 3, the remanence density of the third magnetic steel 5 is larger than that of the fourth magnetic steel 6, the remanence density of the second magnetic steel 4 is equal to that of the third magnetic steel 5, and the remanence density of the first magnetic steel 3 is equal to that of the fourth magnetic steel 6, so that the magnetic field generated by the structure is closer to a sine curve.
The magnetizing directions of the first magnetic steel 3 and the second magnetic steel 4 are perpendicular to the arrangement directions of the first magnetic steel 3 and the second magnetic steel 4, and the magnetizing directions of the first magnetic steel 3 and the second magnetic steel 4 are perpendicular to the axial extension direction of the rotor core 1, namely, the magnetizing directions of the first magnetic steel 3 and the second magnetic steel 4 are the same as the thickness direction of the first magnetic steel 3, and certainly are the same as the thickness direction of the second magnetic steel 4. The magnetizing directions of the third magnetic steel 5 and the fourth magnetic steel 6 are perpendicular to the arrangement directions of the third magnetic steel 5 and the fourth magnetic steel 6, and the magnetizing directions of the third magnetic steel 5 and the dead-ground magnetic steel are also perpendicular to the axial extension direction of the rotor core 1, namely, the magnetizing directions of the third magnetic steel 5 and the fourth magnetic steel 6 are the same as the thickness direction of the third magnetic steel 5 and the thickness direction of the fourth magnetic steel 6.
In this embodiment, the thickness and size of the first magnetic steel 3, the second magnetic steel 4, the third magnetic steel 5 and the fourth magnetic steel 6 are the same, so that the magnetic steel groove 7 is convenient to process, and the installation is also convenient. The first magnetic steel 3 and the second magnetic steel 4 are equal in size in the direction of the interval arrangement of the first magnetic steel and the second magnetic steel, and the third magnetic steel 5 and the fourth magnetic steel 6 are also equal in size in the direction of the interval arrangement of the third magnetic steel and the fourth magnetic steel.
Because the magnetic field distribution of built-in magnet steel formula permanent-magnet machine mainly is decided by the remanence characteristic of magnet steel, the utility model discloses an adopt the magnet steel that has different remanence characteristics in magnet steel groove 7, the surplus magnetic density of two magnet steels in the middle of (second magnet steel 4 and third magnet steel 5) is higher, and two magnet steels in the outside (first magnet steel 3 and fourth magnet steel 6) surplus magnetic densities are lower, so can produce the rotor magnetic field that more approaches sinusoidal distribution. Because the motor back electromotive force mainly produces in stator winding by the rotor magnetic field rotation, the sine degree that improves the rotor magnetic field just can improve the sine degree of motor back electromotive force, and its contrast result is as shown in figure 2 and figure 5, and figure 5 is for adopting the utility model provides a motor rotor's permanent magnet synchronous machine back electromotive force waveform can be seen out for the traditional permanent magnet machine back electromotive force waveform that figure 2 is shown, the utility model discloses a motor rotor can make the harmonic content of back electromotive force waveform reduce, improves the sine degree.
Fig. 6 is adopting the utility model provides a PMSM tooth's socket torque waveform of electric motor rotor can be seen out for the traditional motor tooth's socket torque waveform shown for fig. 3, torque waveform amplitude obviously reduces, and is visible the utility model provides a rotor can effectively improve the torque ripple.
The utility model discloses on the basis of the built-in electric motor rotor of current V-arrangement magnet steel, adopt the magnet steel of two kinds of different remanence to replace the structure of current single magnet steel, can change the distribution of rotor magnetic flow through adjustment magnet steel magnetic property to improve rotor magnetic field sine degree, reduce the motor iron loss, promote motor torque smoothness, reduce the motor cost. And a reinforcing rib 8 is arranged between two adjacent magnetic steel grooves 7, so that the strength of the rotor is enhanced, the highest operating speed is increased, and the power density of the motor is improved. Because the magnetic steel adopts a segmented structure, the eddy current effect of the magnetic steel can be weakened, the temperature rise of the magnetic steel is reduced, and the reliability of the motor is improved.
The utility model discloses permanent-magnet machine rotor embodiment 2, the structure of permanent-magnet machine rotor in this embodiment only lies in with the difference in above-mentioned embodiment: in this embodiment, the first magnetic steel and the second magnetic steel share one magnetic steel slot. In other embodiments, the second magnetic steel and the third magnetic steel may share one magnetic steel slot.
The utility model discloses permanent-magnet machine rotor embodiment 3, the structure of permanent-magnet machine rotor in this embodiment only lies in with the difference in above-mentioned embodiment: and the distance between two groups of magnetic steel groups along the circumferential direction of the rotor core is smaller than that between the other two groups of magnetic steel groups.
The utility model discloses permanent-magnet machine rotor embodiment 4, the structure of permanent-magnet machine rotor in this embodiment only lies in with the difference in above-mentioned embodiment: the thickness of the first magnetic steel in the magnetizing direction is smaller than that of the second magnetic steel in the magnetizing direction.
The utility model discloses permanent-magnet machine rotor embodiment 5, the structure of permanent-magnet machine rotor in this embodiment only lies in with the difference in above-mentioned embodiment: the size of the first magnetic steel in the direction of the interval arrangement of the first magnetic steel and the second magnetic steel is smaller than that of the second magnetic steel in the direction of the interval arrangement of the first magnetic steel and the second magnetic steel.
The utility model discloses permanent-magnet machine's concrete embodiment, permanent-magnet machine include electric motor rotor and motor stator, electric motor rotor's structure and the arbitrary concrete embodiment of above-mentioned permanent-magnet machine rotor structure the same, no longer concrete repeated description.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, the protection scope of the present invention is defined by the claims, and all structural changes equivalent to the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. Permanent magnet machine rotor, its characterized in that includes:
a rotor core (1);
the magnetic steel group (2) comprises a first magnetic steel (3), a second magnetic steel (4), a third magnetic steel (5) and a fourth magnetic steel (6);
the first magnetic steel (3) and the second magnetic steel (4) are embedded in the rotor core (1) and are arranged at intervals in a straight line shape, the remanence density of the second magnetic steel (4) is larger than that of the first magnetic steel (3), the distance between the first magnetic steel (3) and the center of the rotor core (1) is larger than that between the second magnetic steel (4) and the center of the rotor core (1), and the magnetizing direction of the first magnetic steel (3) and the magnetizing direction of the second magnetic steel (4) are perpendicular to the arrangement direction of the first magnetic steel (3) and the second magnetic steel (4) and perpendicular to the axial extension direction of the rotor core (1);
the third magnetic steel (5) and the fourth magnetic steel (6) are embedded in the rotor core (1) and are arranged in a linear shape at intervals, the remanence density of the third magnetic steel (5) is larger than that of the fourth magnetic steel (6), the distance between the fourth magnetic steel (6) and the center of the rotor core (1) is larger than that between the third magnetic steel (5) and the center of the rotor core (1), and the magnetizing directions of the third magnetic steel (5) and the fourth magnetic steel (6) are both perpendicular to the arrangement directions of the third magnetic steel (5) and the fourth magnetic steel (6) and perpendicular to the axial extension direction of the rotor core (1);
the first magnetic steel (3), the second magnetic steel (4), the third magnetic steel (5) and the fourth magnetic steel (6) are arranged in a V shape with an opening back to the center of the rotor core (1);
the magnetic steel group (2) is provided with a plurality of groups and is arranged along the circumferential direction of the rotor core (1).
2. The permanent magnet motor rotor according to claim 1, wherein the rotor core (1) is provided with magnetic steel slots (7) corresponding to the first magnetic steel (3), the second magnetic steel (4), the third magnetic steel (5) and the fourth magnetic steel (6) in a one-to-one manner, the first magnetic steel (3), the second magnetic steel (4), the third magnetic steel (5) and the fourth magnetic steel (6) are embedded in the corresponding magnetic steel slots (7), and reinforcing ribs (8) are formed between the adjacent magnetic steel slots (7).
3. The rotor according to claim 1 or 2, characterized in that each magnetic steel group (2) is arranged uniformly along the circumference of the rotor core (1).
4. The permanent magnet motor rotor according to claim 1 or 2, wherein the first magnetic steel (3) and the second magnetic steel (4) have the same thickness in the magnetizing direction.
5. A rotor according to claim 1 or 2, characterised in that the remanence of the third magnetic steel (5) is equal to the remanence of the second magnetic steel (4) and the remanence of the fourth magnetic steel (6) is equal to the remanence of the first magnetic steel (3).
6. A rotor according to claim 1 or 2, characterised in that the first magnet steel (3) and the second magnet steel (4) are of equal size in the direction of their spacing.
7. The permanent magnet motor rotor according to claim 1 or 2, wherein the first magnetic steel (3) and the fourth magnetic steel (6) are symmetrically arranged, the second magnetic steel (4) and the third magnetic steel (5) are symmetrically arranged, and the symmetry plane of the first magnetic steel (3) and the fourth magnetic steel (6) is superposed with the symmetry plane of the second magnetic steel (4) and the third magnetic steel (5).
8. Permanent magnet machine comprising a machine rotor and a machine stator, characterized in that the machine rotor is a machine rotor according to any of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022673721.2U CN214337668U (en) | 2020-11-18 | 2020-11-18 | Permanent magnet motor and permanent magnet motor rotor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022673721.2U CN214337668U (en) | 2020-11-18 | 2020-11-18 | Permanent magnet motor and permanent magnet motor rotor |
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| CN214337668U true CN214337668U (en) | 2021-10-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114189077A (en) * | 2021-12-13 | 2022-03-15 | 珠海格力电器股份有限公司 | Motor rotor and motor |
| CN117856486A (en) * | 2022-09-30 | 2024-04-09 | 比亚迪股份有限公司 | Rotor assembly, motor and vehicle |
-
2020
- 2020-11-18 CN CN202022673721.2U patent/CN214337668U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114189077A (en) * | 2021-12-13 | 2022-03-15 | 珠海格力电器股份有限公司 | Motor rotor and motor |
| CN117856486A (en) * | 2022-09-30 | 2024-04-09 | 比亚迪股份有限公司 | Rotor assembly, motor and vehicle |
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Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co.,Ltd. Address before: No.1, Shibali Heyu Road, Guancheng Hui District, Zhengzhou City, Henan Province Patentee before: ZHENGZHOU YUTONG BUS Co.,Ltd. |