CN112865362A - Rotor core assembly, rotor and motor - Google Patents
Rotor core assembly, rotor and motor Download PDFInfo
- Publication number
- CN112865362A CN112865362A CN202011577802.0A CN202011577802A CN112865362A CN 112865362 A CN112865362 A CN 112865362A CN 202011577802 A CN202011577802 A CN 202011577802A CN 112865362 A CN112865362 A CN 112865362A
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- magnetic steel
- rotor core
- rotor
- magnetic
- chamfer
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The application provides a rotor core subassembly, rotor and motor. The rotor core assembly comprises an iron core and a magnetic steel slot, wherein the magnetic steel slot extends along the radial direction of the iron core; the center of the iron core is superposed with the center of the peripheral arc of the iron core; the magnetic steel is arranged in the magnetic steel groove; the end part of the magnetic steel, which is far away from the circle center, is provided with a first chamfer structure, and a gap is formed between the magnetic steel and the corresponding groove wall of the magnetic steel. The non-eccentric rotor core structure is adopted, so that the magnetic steel slots are relatively prolonged, the length of the magnetic steel is prolonged, and the magnetic flux is increased; meanwhile, the outer end of the magnetic steel is designed into a chamfer structure to form a magnetism isolating hole, so that unequal air gaps are equivalently formed, the torque pulsation of the non-eccentric rotor is reduced, and the effect similar to the design of the eccentric rotor is realized.
Description
Technical Field
The application belongs to the technical field of motors, and particularly relates to a rotor core assembly, a rotor and a motor.
Background
The DC motor has wide application range, and the principle is that after the DC motor is electrified, the annular current in the stator winding generates an induction magnetic field due to the Faraday's law of electromagnetic induction, and then the magnetic steel in the rotor is attracted to drive the rotor to rotate, so that power is obtained. The direction of the synergy optimization of the direct current motor is how to improve the magnetic flux intensity of the direct current motor or reduce the magnetic flux leakage phenomenon of a rotor core.
As shown in fig. 1, in order to reduce torque ripple, a conventional method uses a rotor core as an eccentric rotor, that is, a center of a circular arc segment of an outer ring of the rotor does not coincide with a center of the rotor core. Therefore, the uneven air gaps on the periphery of the rotor core can be guaranteed, the torque pulsation can be effectively improved due to the uneven air gaps, but the magnetic steel consumption of the eccentric rotor can be slightly reduced, and the magnetic flux efficiency is reduced.
Disclosure of Invention
Therefore, the technical problem to be solved by the present application is to provide a rotor core assembly, a rotor and a motor, which can reduce torque ripple and simultaneously improve magnetic flux.
In order to solve the above problems, the present application provides a rotor core assembly comprising:
the rotor core comprises a magnetic steel slot, and the magnetic steel slot extends along the radial direction of the rotor core; the circle center of the rotor core is superposed with the circle center of the peripheral arc of the rotor core;
the magnetic steel is arranged in the magnetic steel groove; the end part of the magnetic steel, which is far away from the circle center, is provided with a first chamfer structure, and a gap is formed between the magnetic steel and the corresponding groove wall of the magnetic steel.
Optionally, a notch is formed in the side wall, far away from the circle center, of the magnetic steel groove.
Optionally, the end of the magnetic steel groove close to the circle center is designed to be a chamfer structure, and a second chamfer structure is arranged at the corresponding end of the magnetic steel.
Optionally, the magnetic steel and the magnetic steel groove are provided with a fool-proof structure.
Optionally, the fool-proof structure includes a fool-proof boss provided on a circumferential side wall of the magnetic steel along the rotor core, and the fool-proof boss is located at a center line position in an extending direction of the magnetic steel; and fool-proof grooves are arranged at the corresponding positions of the magnetic steel grooves.
Optionally, the gap is filled with a molding compound.
According to another aspect of the present application, there is provided a rotor comprising a rotor core assembly as described above.
Optionally, the number of pole pairs of the rotor is P, the width of the magnet steel slot in the circumferential direction is L1, the wall thickness of the adjacent magnet steel slot between the ends near the center of the circle is L2, and the diameter D of the rotor core has the following relation:
optionally, first chamfer structure or second chamfer structure all includes the scarf, the scarf with magnet steel is along the contained angle between the side of radial extension: the included angle of the first chamfering structure is a,
the included angle of the second chamfer structure is b,
according to a further aspect of the present application, there is provided an electric machine comprising a rotor core assembly as described above or a rotor as described above.
The application provides a rotor core subassembly includes: the rotor core comprises a magnetic steel slot, and the magnetic steel slot extends along the radial direction of the rotor core; the circle center of the rotor core is superposed with the circle center of the peripheral arc of the rotor core; the magnetic steel is arranged in the magnetic steel groove; the end part of the magnetic steel, which is far away from the circle center, is provided with a first chamfer structure, and a gap is formed between the magnetic steel and the corresponding groove wall of the magnetic steel. The non-eccentric rotor core structure is adopted, so that the magnetic steel slots are relatively prolonged, the length of the magnetic steel is prolonged, and the magnetic flux is increased; meanwhile, the outer end of the magnetic steel is designed into a chamfer structure to form a magnetism isolating hole, so that unequal air gaps are equivalently formed, the torque pulsation of the non-eccentric rotor is reduced, and the effect similar to the design of the eccentric rotor is realized.
Drawings
Fig. 1 is a schematic structural view of a conventional rotor core according to an embodiment of the present application;
FIG. 2 is a schematic view of a rotor core structure according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of magnetic steel according to an embodiment of the present application;
FIG. 4 is an isometric view of magnetic steel of an embodiment of the present application;
FIG. 5 is a schematic view of an assembly of magnetic steel and a rotor core according to an embodiment of the present application;
fig. 6 is a schematic view of a rotor plastic-coated structure according to an embodiment of the present application.
The reference numerals are represented as:
1. a rotor core; 11. a magnetic steel groove; 111. opening the gap; 112. a fool-proof groove; 2. magnetic steel; 21. a fool-proof projection; 22. a chamfer plane; 3. and (7) plastic packaging material.
Detailed Description
Referring to fig. 1 to 6 in combination, according to an embodiment of the present application, a rotor core 1 assembly includes:
the rotor core 1 comprises a magnetic steel 2 slot 11, and the magnetic steel 2 slot 11 extends along the radial direction of the rotor core 1; the circle center of the rotor core 1 is superposed with the circle center of the peripheral arc of the rotor core 1;
the magnetic steel 2 is arranged in the magnetic steel 2 groove 11; the end part of the magnetic steel 2 far away from the circle center is provided with a first chamfer angle structure, and a gap exists between the magnetic steel 2 and the 11 walls of the groove.
The centre of a circle at the circular arc place of rotor core 1's the periphery of this application, with the coincidence of the 1 rotatory centre of a circle of this rotor core, also do not have eccentric structure, relative traditional rotor core 1, the radial length of the outer peripheral edge at magnet steel 2 groove 11 place is longer, consequently can set up longer magnet steel 2 to magnet steel 2 quantity and magnetic flux intensity have been improved.
Meanwhile, the magnetic steel 2 is arranged in the magnetic steel 2 groove 11, and a chamfer structure is arranged at the outer end of the magnetic steel 2, so that a gap is formed between the end part and the side wall of the magnetic steel 2 groove 11, unequal air gaps are equivalently formed, and torque pulsation is effectively improved.
The rotor core 1 cancels an eccentric structure, which is more beneficial to mass production and reduces the production difficulty of the rotor core 1.
In some embodiments, the side wall of the magnetic steel 2 slot 11 away from the circle center is provided with a notch 111.
The side wall of the outer side of the magnetic steel 2 groove 11 is provided with a notch 111, so that the outer magnetic isolation bridge is disconnected, and the magnetic flux leakage phenomenon is reduced.
In some embodiments, the end of the magnetic steel 2 slot 11 close to the center of the circle is a chamfered structure, and a second chamfered structure is arranged at the corresponding end of the magnetic steel 2.
The end part of the inner side of the magnetic steel 2 groove 11 is provided with a chamfer structure, so that the length of an inner magnetic isolation bridge between the adjacent magnetic steel 2 grooves 11 is increased, and the magnetic leakage can be reduced; and a second chamfer structure is arranged at the corresponding position of the corresponding magnetic steel 2.
The magnet steel 2 has two chamfer structures on the outer end and the inner end in the whole structure to form a polygonal structure, so that the magnetic flux intensity and the power density of the rotor are improved.
In some embodiments, the magnetic steel 2 and the magnetic steel 2 groove 11 are provided with a fool-proof structure.
In some embodiments, the fool-proof structure includes a fool-proof boss provided on the side wall of the magnetic steel 2 along the circumferential direction of the rotor core 1, and the fool-proof boss is located at the center line position in the extending direction of the magnetic steel 2; a fool-proof groove 112 is arranged at the corresponding position of the magnetic steel 2 groove 11.
Set up on the central point of magnet steel 2 and prevent slow-witted arch 21, set up on the lateral wall of magnet steel 2 groove 11 corresponding position and prevent slow-witted groove 112, can guarantee like this that magnet steel 2 inserts rotor core 1 magnet steel 2 groove 11's direction is unique definite, can not appear inserting the circumstances of turning over, has solved magnet steel 2 and has inserted anti-condemned problem of rotor that leads to.
In some embodiments, the gap is filled with molding compound 3.
Because the outer magnetic isolation bridge of this application rotor core 1 is whole to be broken off, for guaranteeing structural strength, after magnet steel 2 inserts rotor core 1, can fill in the gap with plastic envelope material 3, mould to whole rotor core 1 even package, can increase the reliability of magnet steel 2 and the assembly of rotor core 1, be superior to ordinary glue and bind.
According to another aspect of the present application, there is provided a rotor comprising a rotor core 1 assembly as described above.
The rotor adopting the rotor core 1 assembly can reduce magnetic leakage and improve efficiency.
In some embodiments, the number of pole pairs of the rotor is P, the width L1 of the magnetic steel 2 slot 11 in the circumferential direction, the wall thickness L2 of the adjacent magnetic steel 2 slot 11 between the ends near the center of the circle, and the diameter D of the rotor core 1 have the following relations:
generally, the longer the inner magnetic isolation bridge length L2, the greater the magnetic resistance of the leakage magnetic circuit, the better the magnetic isolation effect, and the lower the leakage magnetic, so increasing the magnetic isolation bridge is one means to reduce the leakage magnetic. However, L2 is determined by the volume of the motor rotor, and is usually 0.5-1 mm; this application carries out the modeling analysis through 1 external diameter to rotor core, rotor pole pair number, interior magnetic bridge width and the 11 widths in magnet steel 2 groove, finally can obtain compromise structural strength and reduce the magnetic leakage simultaneously, and the 2 best widths in the magnet steel 11 grooves of the 2 quantity of magnetic steel of maximize, the efficiency of the power density of promotion rotor and motor.
In some embodiments, the first chamfer structure or the second chamfer structure each includes a chamfer 22, and an included angle between the chamfer 22 and a side surface of the magnetic steel 2 extending in the radial direction is: the included angle of the first chamfering structure is a,
the included angle of the second chamfer structure is b,
after the magnetic steel 2 adopts the chamfer, a magnetism isolating hole can be formed at the outer circle of the non-eccentric rotor core 1, the magnetic flux on the cores on two sides of the magnetic steel 2 is reduced, the magnetic flux leakage is reduced through phase change, the effect similar to an unequal air gap is achieved, and the torque pulsation of the motor is reduced.
According to a further aspect of the present application, there is provided an electric machine comprising a rotor core 1 assembly as described above or a rotor as described above.
The rotor adopts the matching form of the non-eccentric rotor core 1 and the magnetic steel 2, the length of the magnetic steel 2 is increased, the shape of the magnetic steel 2 is changed to equivalently form an unequal air gap structure, and the torque pulsation of the motor can be improved; when the outer magnetic isolation bridge is disconnected, the length of the inner magnetic isolation bridge is lengthened, and the magnetic leakage of the rotor is reduced. And design location on magnet steel 2 and rotor core 1 and prevent slow-witted structure, guarantee magnet steel 2 and insert rotor core 1 back, the rotor core 1 both sides of every fan-shaped unit all are magnet steel 2 faces of same polarity, and whole rotor can form a complete effectual rotor magnetic field.
After the magnetic steel 2 adopts the chamfer, a magnetism isolating hole can be formed at the outer circle of the non-eccentric rotor core 1, the magnetic flux on the cores on two sides of the magnetic steel 2 is reduced, the magnetic flux leakage is reduced through phase change, the effect similar to an unequal air gap is achieved, and the torque pulsation of the motor is reduced. At the interior round department of rotor core 1, the length of the interior magnetic bridge of rotor core 1 can be prolonged in the chamfer design of magnet steel 2, reduces the magnetic leakage of the interior magnetic bridge of iron core, promotes the efficiency of the power density of rotor and motor.
In order to solve the problem that the rotor is scrapped due to the fact that the magnetic steel 2 is inserted reversely, one side of the magnetic steel 2 is provided with a positioning fool-proof boss, and the fool-proof boss is distributed on the center line of the magnetic steel 2 in the bilateral symmetry mode, and the magnetizing directions are parallel magnetizing from the fool-proof boss side. Meanwhile, stator fool-proof grooves 112 are correspondingly formed in the fan-shaped units of the rotor core 1, the fool-proof grooves 112 are distributed on the fan-shaped units of the N poles in a bilateral symmetry mode, the fool-proof grooves 112 are not formed in the fan-shaped units of the S poles, so that the direction that the magnetic steel 2 is inserted into the magnetic steel 2 grooves 11 of the rotor core 1 can be determined uniquely, the situation of reverse insertion cannot occur, and the problem that the rotor is scrapped due to reverse insertion of the magnetic steel 2 is solved.
Meanwhile, as the outer magnetic isolation bridge of the novel high-power-density embedded rotor is completely disconnected, in order to ensure the structural strength, after the magnetic steel 2 is inserted into the rotor core 1, the magnetic steel can be integrally coated with plastic by using a plastic package material 3. The injection molding groove and the injection molding hole reserved on the iron core can be filled with the plastic package material 3, so that the reliability of the assembly of the magnetic steel 2 and the rotor iron core 1 can be improved.
It is easily understood by those skilled in the art that the above embodiments can be freely combined and superimposed without conflict.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (10)
1. A rotor core assembly, comprising:
the rotor core (1) comprises a magnetic steel groove (11), and the magnetic steel groove (11) extends along the radial direction of the rotor core (1); the circle center of the rotor core (1) is superposed with the circle center of the peripheral arc of the rotor core (1);
the magnetic steel (2) is arranged in the magnetic steel groove (11); the end part of the magnetic steel (2) far away from the circle center is provided with a first chamfer angle structure, and a gap is formed between the magnetic steel and the wall of the magnetic steel groove (11).
2. The rotor core assembly according to claim 1, wherein the side wall of the magnetic steel slot (11) away from the center of the circle is provided with a notch (111).
3. The rotor core assembly according to claim 1 or 2, wherein the end of the magnetic steel slot (11) close to the center of the circle is a chamfer structure, and the corresponding end of the magnetic steel (2) is provided with a second chamfer structure.
4. The rotor core assembly according to claim 3, wherein said magnetic steel (2) and said magnetic steel slot (11) are provided with a fool-proof structure.
5. The rotor core assembly according to claim 4, wherein the fool-proof structure comprises fool-proof bosses provided on the side walls of the magnetic steel (2) along the circumferential direction of the rotor core (1), the fool-proof bosses being located at the center line position in the extending direction of the magnetic steel (2); and a fool-proof groove (112) is arranged at the corresponding position of the magnetic steel groove (11).
6. The rotor core assembly according to claim 1, wherein said gap is filled with a molding compound (3).
7. A rotor comprising a rotor core assembly according to any one of claims 1 to 6.
8. The rotor as recited in claim 7, characterized in that the number of pole pairs of the rotor is P, the width of the magnet steel slots (11) in the circumferential direction is L1, the wall thickness of the adjacent magnet steel slots (11) between the ends near the center of the circle is L2, the diameter D of the rotor core (1) has the following relation:
9. the rotor as recited in claim 8, characterized in that the first chamfer structure or the second chamfer structure each comprises a chamfer (22), the included angle between the chamfer (22) and the radially extending side of the magnetic steel (2) being: the included angle of the first chamfering structure is a,
the included angle of the second chamfer structure is b,
10. an electrical machine comprising a rotor core assembly according to any one of claims 1 to 6 or a rotor according to any one of claims 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011577802.0A CN112865362B (en) | 2020-12-28 | 2020-12-28 | Rotor core assembly, rotor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011577802.0A CN112865362B (en) | 2020-12-28 | 2020-12-28 | Rotor core assembly, rotor and motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112865362A true CN112865362A (en) | 2021-05-28 |
| CN112865362B CN112865362B (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011577802.0A Active CN112865362B (en) | 2020-12-28 | 2020-12-28 | Rotor core assembly, rotor and motor |
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| CN112865362B (en) | 2022-03-18 |
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