CN108768029B - Motor rotor and permanent magnet motor - Google Patents
Motor rotor and permanent magnet motor Download PDFInfo
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- CN108768029B CN108768029B CN201810931294.8A CN201810931294A CN108768029B CN 108768029 B CN108768029 B CN 108768029B CN 201810931294 A CN201810931294 A CN 201810931294A CN 108768029 B CN108768029 B CN 108768029B
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- magnetism isolating
- hole
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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
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
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- 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)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a motor rotor and a permanent magnet motor. The motor rotor comprises a rotor core (1), wherein the rotor core (1) is provided with a plurality of permanent magnet grooves (2) along the circumferential direction, permanent magnets (3) are arranged in the permanent magnet grooves (2), magnetism isolating grooves (4) are arranged on the inner sides of the permanent magnet grooves (2), arc-shaped walls are arranged on the two circumferential sides of the magnetism isolating grooves (4), first magnetism isolating holes (5) are arranged between every two adjacent magnetism isolating grooves (4), and arc-shaped first magnetism isolating bridges (6) are formed between the first magnetism isolating holes (5) and the arc-shaped walls. According to the motor rotor provided by the invention, the magnetic isolation effect can be effectively improved, the magnetic leakage on the inner side of the motor rotor is reduced, the magnetic saturation of the motor rotor is improved, and the motor performance is improved.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a motor rotor and a permanent magnet motor.
Background
The motor with the permanent magnet tangential magnetization structure can generate higher air gap flux density than a permanent magnet radial magnetization motor due to the magnetic gathering effect, so that the motor has higher torque/current ratio and torque/volume ratio, and is increasingly applied to occasions such as servo systems, electric traction, office automation, household appliances and the like.
In the tangential permanent magnet motor in the prior art, because the rotor permanent magnets are radially arranged, part of the permanent magnets are deeply buried in the inner side of the rotor, an external magnetic field is applied to the rotor, when the rotor permanent magnets are magnetized, the magnetized magnetic field is difficult to enter the part of the rotor close to the rotating shaft due to the magnetic conduction path in the inner side of the permanent magnets, the part of the permanent magnets close to the rotating shaft cannot be magnetized to reach a saturated state, the performance of the motor is easily reduced, even the permanent magnets lose magnetism, and the motor cannot run.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a motor rotor and a permanent magnet motor, which can effectively improve the magnetic isolation effect, reduce the magnetic leakage at the inner side of the motor rotor, improve the magnetic saturation of the motor rotor and improve the motor performance.
In order to solve the problems, the invention provides a motor rotor which comprises a rotor core, wherein the rotor core is provided with a plurality of permanent magnet grooves along the circumferential direction, permanent magnets are arranged in the permanent magnet grooves, magnetic isolation grooves are arranged on the inner sides of the permanent magnet grooves, arc-shaped walls are arranged on two circumferential sides of each magnetic isolation groove, a first magnetic isolation hole is arranged between every two adjacent magnetic isolation grooves, and an arc-shaped first magnetic isolation bridge is formed between each first magnetic isolation hole and each arc-shaped wall.
Preferably, the first magnetism isolating holes are long-strip-shaped arc-shaped holes, the arc-shaped holes and the arc-shaped walls are arranged in a one-to-one correspondence mode, and a first magnetism isolating bridge is formed between each arc-shaped hole and the corresponding arc-shaped wall.
Preferably, the width of the first magnetic isolation bridge is K, the width of the motor air gap is K, and the ratio of K/satisfies the following relation:
1.4≥K/≥0.8。
preferably, the first magnetism isolating holes between two adjacent magnetism isolating grooves are symmetrical about the center line of the magnetic pole, and the second magnetism isolating bridges with narrow middle parts and wide ends are formed between two adjacent magnetism isolating holes on two sides of the center line of the magnetic pole.
Preferably, the maximum width of the second magnetic isolation bridge is B, the width of the first magnetic isolation bridge is uniform and is K, and the ratio of B/K satisfies the following relation:
1.2≥B/K≥0.85。
preferably, a strip-shaped second magnetism isolating hole is arranged between two adjacent first magnetism isolating holes, the second magnetism isolating hole is positioned on the central line of the magnetic pole, and a second magnetism isolating bridge is formed between the second magnetism isolating hole and the first magnetism isolating hole.
Preferably, the width of the second magnetism isolating holes is uniform and is C, the minimum distance between the second magnetism isolating holes and the first magnetism isolating holes is D, and C is larger than or equal to D/2.
Preferably, a strip-shaped third magnetism isolating hole is arranged between the two first magnetism isolating holes on the two sides of the same magnetism isolating groove at intervals, the third magnetism isolating hole is arranged on the radial inner side of the magnetism isolating groove, and a fourth magnetism isolating bridge is formed between the third magnetism isolating hole and the magnetism isolating groove.
Preferably, a strip-shaped third magnetism isolating hole is arranged between the two first magnetism isolating holes on the two sides of the same magnetism isolating groove, and the third magnetism isolating hole is communicated with the first magnetism isolating holes on the two sides.
Preferably, the first magnetism isolating hole comprises an arc-shaped first side wall and an arc-shaped second side wall, the first side wall and the second side wall are symmetrical about a center line of the magnetic pole, and a first magnetism isolating bridge is formed between the first side wall and the magnetism isolating groove and between the second side wall and the magnetism isolating groove.
Preferably, the radial inner side of the magnetism isolating groove is provided with an opening, the opening is positioned between two first magnetism isolating holes on two sides of the same magnetism isolating groove, and a third magnetism isolating bridge is formed between the opening and the first magnetism isolating holes.
Preferably, the first magnetic isolation bridge has a radially outer width of U and a radially inner width of V, wherein the relationship of U and V is satisfied,
0.8≤U/V≤1.3。
preferably, the outer circumference of the rotor core is sleeved with a fastening sheath which is not magnetically conductive.
Preferably, the magnetism isolating groove and/or the first magnetism isolating hole are/is internally provided with a reinforcing rod which is not conductive to magnetism.
Preferably, the outer surface of the reinforcing rod is in contact with the inner surface of the magnetism isolating groove, or the shape of the reinforcing rod is matched with that of the magnetism isolating groove; and/or the presence of a gas in the gas,
the outer surface of the reinforcing rod is in contact with the inner surface of the first magnetism isolating hole, or the shape of the reinforcing rod is matched with that of the first magnetism isolating hole.
Preferably, the magnetism isolating groove and/or the first magnetism isolating hole are/is filled with non-magnetic materials.
Preferably, each permanent magnet slot is internally provided with a permanent magnet, the permanent magnets are magnetized tangentially, and the polarities of the two adjacent permanent magnets are arranged in a repulsive manner.
According to another aspect of the present invention, there is provided a permanent magnet electric machine comprising an electric machine rotor as described above.
The invention provides a motor rotor which comprises a rotor core, wherein permanent magnet grooves are formed in the rotor core along the circumferential direction, a plurality of permanent magnets are arranged in the permanent magnet grooves, magnetic isolation grooves are formed in the inner sides of the permanent magnet grooves, arc-shaped walls are arranged on two circumferential sides of each magnetic isolation groove, a first magnetic isolation hole is formed between every two adjacent magnetic isolation grooves, and an arc-shaped first magnetic isolation bridge is formed between each first magnetic isolation hole and each arc-shaped wall. First magnetism isolating hole cooperatees with magnetism isolating groove, form curved first magnetism isolating bridge in magnetism isolating groove's bottom both sides, the tangential motor is when magnetizing, the rotor core of permanent magnet tank bottom both sides constitutes the magnetic conduction route, magnetic line of force is closed from this magnetic conduction route, make the difficult bottom position that gets into the permanent magnet of magnetic line of force, form magnetic leakage flux phi, set up convex magnetism isolating bridge in permanent magnet inboard bottom, can increase the magnetic resistance of permanent magnet tank bottom route, reduce the closed magnetic line of force of magnetizing field here, impel the magnetic line of force to get into the inboard position of magnet steel, thereby improve the magnetism saturation of rotor permanent magnet, can reduce the permanent magnet tip magnetic leakage that is close to the rotor bottom simultaneously, and then improve the magnetic linkage of motor, promote the performance of motor, the more saturated is magnetized to the permanent magnet, the demagnetization ability of motor is stronger.
Drawings
FIG. 1 is a schematic diagram of a dimensional structure of a rotor of an electric machine according to an embodiment of the present invention;
fig. 2 is a schematic view of a magnetic circuit structure of a rotor of an electric machine according to an embodiment of the present invention;
FIG. 3 is a schematic view of a dimensional structure of a rotor of an electric machine according to another embodiment of the present invention;
FIG. 4 is a schematic view of a dimensional structure of a rotor of an electric machine according to another embodiment of the present invention;
FIG. 5 is a schematic view of a dimensional structure of a rotor of an electric machine according to another embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a rotor of an electric machine according to another embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a rotor of an electric machine according to another embodiment of the present invention;
FIG. 8 is a schematic structural view of a rotor of an electric machine according to another embodiment of the present invention;
fig. 9 is a schematic view of a magnetic circuit structure of a rotor of an electric machine according to another embodiment of the present invention;
FIG. 10 is a schematic structural view of a rotor of an electric machine according to another embodiment of the present invention;
FIG. 11 is a schematic structural view of a rotor of an electric machine according to another embodiment of the present invention;
fig. 12 is a schematic structural diagram of a rotor of an electric machine according to another embodiment of the present invention.
The reference numerals are represented as:
1. a rotor core; 2. a permanent magnet slot; 3. a permanent magnet; 4. a magnetism isolating groove; 5. a first magnetism isolating hole; 6. a first magnetic isolation bridge; 7. a rotating shaft hole; 8. fastening the sheath; 9. a reinforcing bar; 10. an opening; 11. a second magnetic isolation bridge; 12. a second magnetism isolating hole; 13. a third magnetism isolating hole; 14. a third magnetic isolation bridge; 15. a fourth magnetic isolation bridge; 16. and (6) opening holes.
Detailed Description
Referring to fig. 1 to 12 in combination, according to an embodiment of the present invention, a motor rotor includes a rotor core 1, the rotor core 1 is provided with a plurality of permanent magnet slots 2 along a circumferential direction, permanent magnets 3 are disposed in the permanent magnet slots 2, magnetic isolation slots 4 are disposed inside the permanent magnet slots 2, arc-shaped walls are disposed on two circumferential sides of each magnetic isolation slot 4, a first magnetic isolation hole 5 is disposed between two adjacent magnetic isolation slots 4, and an arc-shaped first magnetic isolation bridge 6 is formed between each first magnetic isolation hole 5 and each arc-shaped wall. The permanent magnet 3 is, for example, a ferrite permanent magnet, a rare earth permanent magnet, or other permanent magnets. Preferably, each permanent magnet slot 2 is provided with a permanent magnet 3, the permanent magnets 3 are magnetized tangentially, and the two adjacent permanent magnets 3 are arranged in a way that the polarities of the two permanent magnets are opposite.
Set up this kind of curved magnetism isolating construction in permanent magnet inboard bottom, can increase the magnetic resistance of 2 bottom passageways in permanent magnet groove, reduce the magnetic line of force of magnetizing magnetic field closed here, impel the magnetic line of force to get into the permanent magnet bottom to improve the saturation degree of magnetizing of rotor permanent magnet, can reduce the permanent magnet tip magnetic leakage that is close to the rotor bottom simultaneously, and then improve the no-load flux linkage of motor, improve the power density of motor, promote the efficiency of motor.
In this embodiment, permanent magnets 3 are uniformly distributed on rotor core 1 along the circumferential direction, the number of permanent magnets 3 is N, where N is an even number greater than or equal to 4, each permanent magnet 3 is placed along the radial direction of rotor core, and permanent magnets 3 are magnetized along the tangential direction, and two adjacent permanent magnets 3 have the same polarity and are oppositely arranged. Rotor core 1 inboard has pivot hole 7, and the radial inboard that permanent magnet groove 2 is close to pivot hole 7 is called the inboard of permanent magnet groove 2, and the radial outside that is close to the rotor excircle is called the outside of permanent magnet groove 2, and rotor core 1 formula structure as an organic whole has a connecting rib between permanent magnet inslot side and the pivot hole 7.
The magnetism isolating groove 4 is the top along the side close to the rotating shaft hole 7 in the radial direction, the bottom along the side far away from the rotating shaft hole 7 in the radial direction, the bottom along the side close to the rotating shaft hole 7 in the radial direction of the first magnetism isolating hole 5, and the top along the side far away from the rotating shaft hole 7 in the radial direction. That is, the radially inner side of the magnetism isolating groove 4 is the top side of the magnetism isolating groove 4, the radially outer side of the magnetism isolating groove 4 is the bottom side, the radially inner side of the first magnetism isolating hole 5 is the bottom side, and the radially outer side of the first magnetism isolating hole 5 is the top side.
The radial outer side of the permanent magnet groove 2, which is far away from the rotating shaft hole 7, is provided with an opening 10, and the opening 10 penetrates through the rotor core 1 from the permanent magnet groove 2 outwards in the radial direction, so that the magnetic leakage of the permanent magnet 3 on the radial outer side can be further reduced, the air gap flux density is improved, and the motor efficiency is improved.
The first magnetism isolating holes 5 are matched with the magnetism isolating grooves 4, arc-shaped first magnetism isolating bridges 6 are formed on two sides of the bottoms of the magnetism isolating grooves 4, when the tangential motor is magnetized, rotor cores on two sides of the bottoms of the permanent magnet grooves 2 form a magnetism conducting path, magnetic lines of force are closed from the magnetism conducting path, so that the magnetic lines of force are difficult to enter the bottom of the inner sides of the permanent magnets to form magnetic leakage flux phi sigma, the magnetism isolating structure is arranged on the bottom of the inner sides of the permanent magnets, the magnetic resistance of the bottom of the permanent magnet grooves 2 can be increased, the magnetic lines of force of a magnetizing magnetic field closed at the position are reduced, the magnetic lines of force enter the bottom of magnetic steel, the magnetism saturation of the rotor permanent magnets 3 is improved, the magnetic leakage of the end parts of the permanent magnets close to the inner sides of the rotors can be reduced even if rigid shafts are adopted, the magnetic chain of the, the air gap flux density is improved, and the motor efficiency is improved.
In one embodiment, the first magnetism isolating holes 5 are elongated arc-shaped holes, the arc-shaped holes are arranged in a one-to-one correspondence with the arc-shaped walls, and a first magnetism isolating bridge 6 is formed between each arc-shaped hole and the corresponding arc-shaped wall. In this embodiment, the widths of the first magnetism isolating holes 5 are the same, two first magnetism isolating holes 5 are arranged between two adjacent magnetism isolating grooves 4, the two first magnetism isolating holes 5 are respectively located at two sides of a central line of a magnetic pole, and each first magnetism isolating hole 5 is matched with the arc-shaped wall of the magnetism isolating groove 4 at the side where the first magnetism isolating hole is located to form an arc-shaped first magnetism isolating bridge 6.
Preferably, the width of the first magnetic isolation bridge 6 is K, the width of the motor air gap is K/K, and the ratio of K/satisfies the following relation: the magnetic flux linkage structure has the advantages that K is larger than or equal to 1.4 and is larger than or equal to 0.8, when K is smaller than 0.8, the width of the first magnetic isolation bridge 6 is too narrow, so that the connection strength of the magnetic isolation bridge is reduced, when K is larger than 1.4, the width of the connection bridge is too wide, magnetic force lines passing through the magnetic isolation bridge are increased, magnetic flux leakage is increased, the magnetic saturation of a permanent magnet is reduced, and the magnetic flux linkage of a motor is reduced.
Preferably, the first magnetism isolating holes 5 positioned between two adjacent magnetism isolating grooves 4 are symmetrical about the center line of the magnetic pole, and the second magnetism isolating bridges 11 with narrow middle parts and wide ends are formed between two adjacent magnetism isolating holes 5 positioned at two sides of the center line of the magnetic pole.
The minimum width of the second magnetism isolating bridge 11 is B, the width of the first magnetism isolating bridge 6 is uniform and is K, and the ratio of B/K satisfies the following relation: B/K is more than or equal to 1.2 and more than or equal to 0.85. The second magnetic isolation bridge 11 cannot be too wide, otherwise, the magnetic line of force of the magnetizing magnetic field can pass through the second magnetic isolation bridges 11 on the two sides of the permanent magnet 3 to form a closed magnetic circuit of the magnetizing magnetic line of force, the magnetic line of force cannot enter the bottom of the permanent magnet 3, and the magnetic leakage is increased.
A strip-shaped second magnetism isolating hole 12 is arranged between two adjacent first magnetism isolating holes 5, the second magnetism isolating hole 12 is positioned on the central line of the magnetic pole, and a second magnetism isolating bridge 11 is formed between the second magnetism isolating hole 12 and the first magnetism isolating holes 5. The magnetic resistance at the bottom of the permanent magnet groove can be increased by using non-magnetic materials in the second magnetism isolating holes 12, the magnetism isolating effect is further improved, the larger the area of the strip-shaped holes is, the larger the magnetism resistance of the magnetic circuit on the inner side of the permanent magnet is, and if the width of the second magnetism isolating holes 12 is too narrow, the magnetism isolating effect cannot be well played.
Preferably, the width of the second magnetism isolating hole 12 is uniform and is C, the minimum distance between the second magnetism isolating hole 12 and the first magnetism isolating hole 5 is D, and C is larger than or equal to D/2, so that the magnetism isolating effect can be improved, the magnetism saturation of the permanent magnet is improved, the flux linkage of the motor is further improved, the motor efficiency is improved, and the power density of the motor is improved.
Preferably, a strip-shaped third magnetism isolating hole 13 is arranged between two first magnetism isolating holes 5 positioned on two sides of the same magnetism isolating groove 4 at intervals, the third magnetism isolating hole 13 is positioned on the radial inner side of the magnetism isolating groove 4, and a fourth magnetism isolating bridge 15 is formed between the third magnetism isolating hole 13 and the magnetism isolating groove 4. Form one section fourth magnetism bridge 15 between third magnetism hole 13 and magnetism groove 4, can increase the length of first magnetism bridge 6, be air or other non-magnetic conduction material in the third magnetism hole 13, the area that third magnetism hole 13 separates is big more, its magnetic resistance is big more, the magnetic resistance of the inboard magnetic circuit of permanent magnet is big more, thereby promote magnetism effect, promote the permanent magnet saturation degree of magnetizing, promote the motor magnetic linkage, improve the efficiency of motor, promote the performance of motor.
In another embodiment, a strip-shaped third magnetism isolating hole 13 is arranged between two first magnetism isolating holes 5 positioned at two sides of the same magnetism isolating groove 4, and the third magnetism isolating hole 13 is communicated with the first magnetism isolating holes 5 at two sides. In this embodiment, the third separates the bottom intercommunication in magnetism hole 13 and the first magnetism hole 5 of separating of both sides to form integral magnetism hole structure that separates, can further restrict the magnetic leakage flux route, and increased the area of first magnetism hole 5 that separates, increased the magnetic resistance in first magnetism hole 5 that separates, further improve the magnetism effect that separates, promote the magnetic line of force that the magnetic field that magnetizes gets into the permanent magnet bottom, reduce the magnetic leakage of magnetic field at the permanent magnet inboard, promote the permanent magnet saturation that magnetizes, promote motor efficiency.
Preferably, the radial inner side of the magnetism isolating groove 4 is provided with an opening 16, and the opening 16 is positioned between two first magnetism isolating holes 5 on two sides of the same magnetism isolating groove 4 and forms a third magnetism isolating bridge 14 with the first magnetism isolating holes 5. A section of third magnetism isolating bridge 14 is formed between the bottom of the first magnetism isolating hole 5 and the bottom of the opening 16, on one hand, the area of the first magnetism isolating hole 5 at the bottom of the permanent magnet is increased, the magnetic resistance of the bottom hole of the permanent magnet groove 2 is increased, on the other hand, the length of the first magnetism isolating bridge 6 is prolonged by the increased third magnetism isolating bridge 14, the magnetism isolating effect is further improved comprehensively by the first magnetism isolating hole and the third magnetism isolating bridge, the magnetic force line of a magnetizing magnetic field entering the inner side of the permanent magnet is improved, and the magnetizing saturation of the permanent.
Preferably, the first magnetism isolating hole 5 comprises an arc-shaped first side wall and an arc-shaped second side wall, the first side wall and the second side wall are symmetrical about a center line of the magnetic pole, and a first magnetism isolating bridge 6 is formed between the first side wall and the magnetism isolating groove 4 and between the second side wall and the magnetism isolating groove 4. In this embodiment, an integral first magnetism isolating hole 5 is arranged between adjacent magnetism isolating grooves 4, the first magnetism isolating hole 5 is of a structure with a narrow middle part and two wide ends, an arc-shaped first side wall and an arc-shaped second side wall are formed on two sides, an arc-shaped first magnetism isolating bridge 6 is formed between the arc-shaped first side wall and the arc-shaped second side wall and the magnetism isolating grooves 4 on two sides respectively, on one hand, the area of the first magnetism isolating hole 5 at the bottom of the permanent magnet is increased, the magnetic resistance of the bottom hole of the permanent magnet groove 2 is increased, on the other hand, the length of the first magnetism isolating hole 5 is prolonged through the added third magnetism isolating bridge 14, the two magnetism isolating effects are comprehensively further improved, the magnetic force line of a magnetizing magnetic field entering the inner side of the permanent magnet is improved, and the magnetism saturation degree of the.
Preferably, the width of the radial outer side of the first magnetism isolating bridge 6 is U, the width of the radial inner side is V, the relation between U and V is satisfied, U/V is more than or equal to 0.8 and less than or equal to 1.3, the width of the inner side and the outer side of the magnetism isolating bridge can be inconsistent, when the width of one side is smaller, the width of the other side can be increased, on one hand, the magnetism isolating effect is ensured, and on the other hand, the reduction of the connection strength caused by the too narrow magnetism isolating bridge can be avoided.
The peripheral side of the rotor core 1 is sleeved with a fastening sheath 8 which is not magnetic. The fastening sheath 8 is of a sleeve structure, is not magnetic, can further reinforce the structure of the motor rotor, improves the structural strength of the motor rotor, improves the operating frequency range of the motor rotor, improves the operating reliability, and widens the application occasions of the tangential motor.
The magnetism isolating groove 4 and/or the first magnetism isolating hole 5 are/is internally provided with a reinforcing rod 9 which is not magnetic to conduct, the reinforcing rod 9 is not magnetic to conduct, the surface of the part of the reinforcing rod 9 which is arranged at the inner side of the rotor is contacted with the magnetism isolating groove 4 or the first magnetism isolating hole 5 or is matched with the shapes of the magnetism isolating groove and the first magnetism isolating hole, the part of the reinforcing rod 9 which is arranged at the outer side of the rotor can be made into a round shape or other shapes, and the part of the reinforcing rod 9 which is arranged at the outer side of the rotor is connected with a rotor baffle plate.
The magnetism isolating groove 4 and/or the first magnetism isolating hole 5 are filled with non-magnetic materials. The magnetism isolating groove 4 and the first magnetism isolating hole 5 can be completely filled with non-magnetic conductive materials to serve as reinforcing parts, and the reinforcing rods 9 can be filled with the non-magnetic conductive materials after being filled, so that the reinforcing rods 9 are fixedly installed in the magnetism isolating groove 4 and/or the first magnetism isolating hole 5 through the filled non-magnetic conductive materials.
The permanent magnet slot 2 may be rectangular or trapezoidal.
According to an embodiment of the invention, a permanent magnet motor comprises a motor rotor, which is the motor rotor described above.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (13)
1. The motor rotor is characterized by comprising a rotor core (1), wherein the rotor core (1) is provided with a plurality of permanent magnet grooves (2) along the circumferential direction, permanent magnets (3) are arranged in the permanent magnet grooves (2), magnetism isolating grooves (4) are arranged on the inner sides of the permanent magnet grooves (2), arc-shaped walls are arranged on two circumferential sides of each magnetism isolating groove (4), a first magnetism isolating hole (5) is arranged between every two adjacent magnetism isolating grooves (4), and an arc-shaped first magnetism isolating bridge (6) is formed between each first magnetism isolating hole (5) and each arc-shaped wall; the first magnetism isolating holes (5) are long-strip arc-shaped holes, the widths of the first magnetism isolating holes (5) are the same, two first magnetism isolating holes (5) are arranged between every two adjacent magnetism isolating grooves (4), the two first magnetism isolating holes (5) are respectively positioned on two sides of a magnetic pole central line, and each first magnetism isolating hole (5) is matched with the arc-shaped wall of the magnetism isolating groove (4) on the side where the first magnetism isolating hole is positioned to form a first magnetism isolating bridge (6);
a strip-shaped second magnetism isolating hole (12) is arranged between every two adjacent first magnetism isolating holes (5), the second magnetism isolating hole (12) is located on the central line of a magnetic pole, and a second magnetism isolating bridge (11) is formed between the second magnetism isolating hole (12) and the first magnetism isolating holes (5).
2. The machine rotor according to claim 1, characterised in that the width of the first magnetic bridge (6) is K, the width of the machine air gap is K, and the ratio K/satisfies the following relation:
1.4≥K/≥0.8。
3. the electric machine rotor according to claim 1, characterized in that the width of the second magnetism isolating holes (12) is uniform and is C, and the minimum distance between the second magnetism isolating holes (12) and the first magnetism isolating holes (5) is D, C ≧ D/2.
4. The motor rotor as recited in claim 1, characterized in that a strip-shaped third magnetism isolating hole (13) is arranged between two first magnetism isolating holes (5) on two sides of the same magnetism isolating groove (4) at intervals, the third magnetism isolating hole (13) is positioned on the radial inner side of the magnetism isolating groove (4), and a fourth magnetism isolating bridge (15) is formed between the third magnetism isolating hole (13) and the magnetism isolating groove (4).
5. The motor rotor as recited in claim 1, characterized in that a strip-shaped third magnetism isolating hole (13) is arranged between two first magnetism isolating holes (5) on two sides of the same magnetism isolating groove (4), and the third magnetism isolating hole (13) is communicated with the first magnetism isolating holes (5) on two sides.
6. An electric machine rotor according to claim 1, characterized in that the radially inner side of the flux barrier groove (4) is provided with an opening (16), and the opening (16) is located between two first flux barriers (5) on both sides of the same flux barrier groove (4) and forms a third flux barrier bridge (14) with the first flux barriers (5).
7. An electric machine rotor, according to claim 1, characterized in that said first flux-isolating bridge (6) has a radially outer width U and a radially inner width V, wherein the relation of U and V is satisfied,
0.8≤U/V≤1.3。
8. an electric machine rotor according to claim 1, characterized in that the outer circumference of the rotor core (1) is sleeved with a non-magnetic fastening sheath (8).
9. An electric machine rotor according to claim 1, characterised in that non-magnetic conducting reinforcement bars (9) are arranged in the flux barrier slots (4) and/or the first flux barrier holes (5).
10. An electric machine rotor according to claim 9, characterised in that the outer surface of the reinforcement bar (9) is in contact with the inner surface of the flux barrier groove (4) or the shape of the reinforcement bar (9) matches the shape of the flux barrier groove (4); and/or the presence of a gas in the gas,
the outer surface of the reinforcing rod (9) is in contact with the inner surface of the first magnetism isolating hole (5), or the shape of the reinforcing rod (9) is matched with that of the first magnetism isolating hole (5).
11. An electric machine rotor according to any of claims 1-5, 7-10, characterized in that the flux-barrier slot (4) and/or the first flux-barrier hole (5) is filled with a non-magnetically conductive material.
12. An electric machine rotor according to claim 1, characterized in that a permanent magnet (3) is arranged in each permanent magnet slot (2), the permanent magnets (3) being tangentially magnetized, and two adjacent permanent magnets (3) being arranged with their polarities opposing each other.
13. A permanent magnet electrical machine comprising an electrical machine rotor, characterized in that the electrical machine rotor is an electrical machine rotor according to any of claims 1-12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931294.8A CN108768029B (en) | 2018-08-15 | 2018-08-15 | Motor rotor and permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931294.8A CN108768029B (en) | 2018-08-15 | 2018-08-15 | Motor rotor and permanent magnet motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108768029A CN108768029A (en) | 2018-11-06 |
| CN108768029B true CN108768029B (en) | 2020-07-28 |
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| CN201810931294.8A Active CN108768029B (en) | 2018-08-15 | 2018-08-15 | Motor rotor and permanent magnet motor |
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| CN110224516A (en) * | 2019-07-08 | 2019-09-10 | 苏州市润豪电机有限公司 | A kind of two extremely embedded brushless DC motor rotors |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048666A (en) * | 2014-04-30 | 2015-11-11 | 马渊马达株式会社 | Rotor and brushless motor |
| CN105048667A (en) * | 2014-04-30 | 2015-11-11 | 马渊马达株式会社 | Rotor and brushless motor |
| CN105490415A (en) * | 2016-01-06 | 2016-04-13 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent magnet rotor and permanent magnet motor |
| WO2017121567A1 (en) * | 2016-01-14 | 2017-07-20 | Jaguar Land Rover Limited | Rotor for an electric machine |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048666A (en) * | 2014-04-30 | 2015-11-11 | 马渊马达株式会社 | Rotor and brushless motor |
| CN105048667A (en) * | 2014-04-30 | 2015-11-11 | 马渊马达株式会社 | Rotor and brushless motor |
| CN105490415A (en) * | 2016-01-06 | 2016-04-13 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent magnet rotor and permanent magnet motor |
| WO2017121567A1 (en) * | 2016-01-14 | 2017-07-20 | Jaguar Land Rover Limited | Rotor for an electric machine |
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