CN118100487A - Rotor, motor and compressor - Google Patents
Rotor, motor and compressor Download PDFInfo
- Publication number
- CN118100487A CN118100487A CN202410480472.5A CN202410480472A CN118100487A CN 118100487 A CN118100487 A CN 118100487A CN 202410480472 A CN202410480472 A CN 202410480472A CN 118100487 A CN118100487 A CN 118100487A
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- rotor
- groove
- magnetic
- magnetic steel
- rotor core
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 81
- 239000010959 steel Substances 0.000 claims abstract description 81
- 230000004888 barrier function Effects 0.000 claims description 68
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 24
- 230000002829 reductive effect Effects 0.000 description 12
- 230000002093 peripheral effect Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004080 punching Methods 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 229910000976 Electrical steel Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
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- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a rotor, a motor and a compressor, and relates to the technical field of motors, wherein the rotor comprises a rotor core, the rotor core comprises a plurality of structural groups, the structural groups comprise first magnetic steel grooves, the first magnetic steel grooves are in arc shapes which are bent towards the circle center deviating from the rotor core, and the first magnetic steel grooves are used for permanent magnet installation; the radius of the outer groove wall of the first magnetic steel groove is R 1, the radius R 2 of the rotor core, and the relation between R 1 and R 2 is: 0.55> R 1/R2 >0.4. The technical scheme of the invention can improve the reluctance torque of the motor, improve the output force of the motor and further improve the efficiency of the motor.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a rotor, a motor and a compressor.
Background
The motor is an electromagnetic device for converting or transmitting electric energy according to the law of electromagnetic induction, the electromagnetic motor comprises a stator and a rotor, the rotor structure comprises a rotor iron core and a permanent magnet group, in particular, a magnetic steel groove is arranged on the rotor iron core, and the permanent magnet is embedded in the magnetic steel groove.
At present, the reluctance torque of the motor is lower because the magnetic gathering effect of the permanent magnet is poor in the motor on the market.
Disclosure of Invention
The main object of the present invention is to provide a rotor aimed at increasing the reluctance torque of an electric machine.
To achieve the above object, the present invention provides a rotor comprising:
The rotor iron core comprises a plurality of structural groups, wherein the structural groups comprise first magnetic steel grooves, the first magnetic steel grooves are arc-shaped and bent towards the circle center deviating from the rotor iron core, and the first magnetic steel grooves are used for mounting permanent magnets;
The radius of the outer groove wall of the first magnetic steel groove is R 1, the radius R 2 of the rotor core, and the relation between R 1 and R 2 is: 0.55> R 1/R2 >0.4.
Optionally, the structure group further comprises a second magnetic steel groove, and the second magnetic steel groove is arranged between the inner groove wall of the first magnetic steel groove and the outer circumferential surface of the rotor core.
Optionally, the second magnetic steel groove comprises a first groove section and a second groove section which are arranged at intervals, and the distance between the first groove section and the second groove section is gradually increased in a direction away from the center of the rotor core.
Optionally, the second magnetic steel groove further comprises a first folding groove and a second folding groove, the first folding groove is communicated with one end, close to the center of the rotor core, of the first groove section and extends towards the direction of the outer peripheral surface of the rotor core, the second folding groove is communicated with one end, close to the center of the rotor core, of the second groove section and extends towards the direction of the outer peripheral surface of the rotor core, and the distance between the first folding groove and the second folding groove is gradually increased in the direction, close to the center of the rotor core.
Optionally, the minimum distance between the first folding groove and the second folding groove is K 1, the maximum distance between the first folding groove and the second folding groove is K 2, and the relationships between K 1 and K 2 are: 0.15< K 1/K2 <0.25.
Optionally, the structure group further comprises a magnetic barrier hole, and the magnetic barrier hole is arranged between the first groove section and the second groove section and is close to the circle center of the rotor core.
Optionally, the structural groups are arranged in axisymmetric patterns.
Optionally, the structure group further includes a plurality of magnetic barrier grooves, and a plurality of the magnetic barrier grooves are arranged between the inner groove wall of the first magnetic steel groove and the outer peripheral surface of the rotor core at intervals.
Optionally, lengths of the plurality of magnetic barrier grooves located at both sides of the symmetry axis of the structural group gradually decrease in a direction away from the symmetry axis.
The invention also provides a motor comprising the rotor.
The invention also provides a compressor comprising the motor.
The rotor at least comprises the following beneficial effects:
The technical scheme of the invention is that the rotor core comprises a plurality of structural groups, the structural groups comprise first magnetic steel grooves, the first magnetic steel grooves are arc-shaped and bent towards the circle center deviating from the rotor core, and the first magnetic steel grooves are used for installing permanent magnets; the radius of the outer groove wall of the first magnetic steel groove is R 1, and the relation between the radius R 2,R1 of the rotor core and the radius R 2 of the rotor core is: 0.55> R 1/R2 >0.4. It can be understood that the larger the radius R 1 of the outer groove wall of the first magnetic steel groove is, the larger the volume of the permanent magnet in the first magnetic steel groove is, and the relation between R 1 and R 2 is limited to 0.55> R 1/R2 >0.4, so that the volume of the permanent magnet in the first magnetic steel groove can be ensured, the reluctance torque can be improved, the output force of the motor can be improved, and the efficiency of the motor can be further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a partial structure of an embodiment of a rotor according to the present invention;
FIG. 2 is a graph showing the variation of counter electromotive force of the rotor according to the present invention with K 1/K2;
FIG. 3 is a graph showing the variation of the motor efficiency with R 1/R2 according to the present invention.
Reference numerals illustrate:
100. a rotor core; 200. a structural group; 210. a first magnetic steel groove; 220. a second magnetic steel groove; 221. a first trough section; 222. a second trough section; 223. a first folding groove; 224. a second folding groove; 230. a magnetic barrier hole; 240. a magnetic barrier groove; 300. permanent magnets.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The motor comprises a stator and a rotor, wherein the rotor is arranged in the stator, and the rotor is driven to rotate through the stator.
The stator includes a stator core including a plurality of stator teeth and a stator yoke supporting the plurality of stator teeth, the plurality of stator teeth enclosing a stator bore for mounting the rotor in the stator bore. Stator slots are formed between two adjacent stator teeth, windings are wound on the stator teeth, and the windings are positioned in the stator slots.
The stator core can be formed by laminating stator punching sheets, so that the iron loss of the stator core is reduced, and the output torque and the efficiency are improved. The stator punching sheet can be made of silicon steel sheets so as to reduce the cost.
Alternatively, the stator may be nested in a housing made of iron, aluminum, or the like, to secure the stator. Of course, the housing may be made of a material such as plastic. It will be appreciated that the housing may also be injection molded as a unitary structure with the stator. The rotor can be fixed with the shell through the bearing, so that the rotor and the stator are coaxially arranged, and the stator can conveniently drive the rotor to rotate stably. It will be appreciated that in use, the stator and rotor may be mounted directly in the application without the provision of a housing.
The invention provides a rotor.
The rotor comprises a rotor core 100, and the rotor core 100 can be formed by laminating rotor punching sheets, so that the iron loss of the rotor core 100 is reduced, and the output torque and the efficiency are improved. The rotor punching sheet can be made of silicon steel sheets so as to reduce the cost.
Referring to fig. 1 and 3, in an embodiment of the present invention, the rotor includes a rotor core 100, the rotor core 100 includes a plurality of structural groups 200, the structural groups 200 include first magnetic steel grooves 210, the first magnetic steel grooves 210 are curved toward a center of a circle away from the rotor core 100, and the first magnetic steel grooves 210 are used for mounting permanent magnets 300; the radius of the outer slot wall of the first magnetic steel slot 210 is R 1, and the relationship between the radii R 2,R1 and R 2 of the rotor core 100 is: 0.55> R 1/R2 >0.4.
It can be understood that the larger the radius R 1 of the outer groove wall of the first magnetic steel groove 210 is, the larger the volume of the permanent magnet 300 in the first magnetic steel groove 210 is, and the relationship between R 1 and R 2 is limited to 0.55> R 1/R2 >0.4, so that the volume of the permanent magnet 300 in the first magnetic steel groove 210 can be ensured, thereby improving the reluctance torque, improving the output force of the motor, and further improving the efficiency of the motor.
Referring to fig. 3, fig. 3 is a schematic diagram showing a change of the motor efficiency with R 1/R2, and as can be seen from fig. 3, when R 1/R2 is less than 0.47, the motor efficiency increases with an increase of the ratio of R 1/R2, when R 1/R2 is more than 0.47, the motor efficiency decreases with an increase of the ratio of R 1/R2, and when the ratio of R 1/R2 is between 0.4 and 0.55, the motor efficiency reaches an optimal value.
The two adjacent structural groups 200 are symmetrically arranged, and the symmetrical center lines between the two adjacent structural groups 200 are arranged along the radial direction of the rotor core 100. In other words, each center line of symmetry passes through the center of the rotor core 100. This allows the magnetic field of the structural assembly 200 to be symmetrical for ease of design and control, and reduces harmonics so that the flux path is generally sinusoidal.
Specifically, the two first magnetic steel grooves 210 are also symmetrically disposed about the center line of symmetry.
Optionally, the structural group 200 further includes a second magnetic steel groove 220, where the second magnetic steel groove 220 is disposed between an inner groove wall of the first magnetic steel groove 210 and an outer circumferential surface of the rotor core 100.
Permanent magnets 300 are installed in both the first and second magnetic steel grooves 210 and 220. The permanent magnet 300 can provide a permanent magnetic field, so that when the permanent magnet is matched with a stator, permanent magnetic torque can be generated, and the output torque of the manufactured motor is improved. The first magnetic steel groove 210, the second magnetic steel groove 220, and the permanent magnet 300 thus cooperate to form a magnetic pole unit in the rotor core 100.
In one embodiment, considering the magnetic leakage effect, and reducing the demagnetizing effect of the demagnetizing current when the motor outputs reluctance torque on the permanent magnet, a width may be reserved between the permanent magnet 300 in the first magnetic steel groove 210 and the first magnetic steel groove 210, and a width may be reserved between the permanent magnet 300 in the second magnetic steel groove 220 and the second magnetic steel groove 220, that is, a gap is formed between the permanent magnet 300 in the first magnetic steel groove 210 and the first magnetic steel groove 210, and a gap is formed between the permanent magnet 300 in the second magnetic steel groove 220 and the second magnetic steel groove 220.
It is to be understood that the permanent magnet 300 may be a rare earth sintered magnet, a rare earth bonded magnet, a ferrite sintered magnet, a ferrite bonded magnet, or the like. However, rare earth magnets are expensive and ferrite magnets are relatively more expensive. However, the residual magnetism of the ferrite material is smaller, the currently known material does not exceed 0.5T, the ferrite motor simply depends on the permanent magnet torque to output, and the motor output torque is smaller. In the embodiment, the motor with the combination of the permanent magnet torque and the reluctance torque is adopted, so that the output torque can be improved, the performance can be improved under the same current condition, and when the motor is compared with a purely synchronous reluctance motor, the unit current output capacity of the motor can be improved due to the fact that the permanent magnet is used, and meanwhile, the power factor of the manufactured motor is not lower than that of an induction motor with the same power.
Alternatively, the second magnetic steel groove 220 includes a first groove segment 221 and a second groove segment 222 that are disposed at intervals, and the distance between the first groove segment 221 and the second groove segment 222 increases gradually in a direction away from the center of the rotor core 100. Specifically, the first slot segment 221 and the second slot segment 222 are each provided with a permanent magnet 300. Of course, the present invention is not limited thereto, and in other embodiments, the second magnetic steel groove 220 may also be an arc magnetic steel groove curved toward the center of the rotor core 100.
In one embodiment, the permanent magnets 300 in the first slot segment 221 and the second slot segment 222 may be rectangular magnets, so as to facilitate processing, manufacturing and installation, and may be combined with the permanent magnets 300 of the first magnetic steel slot 210, so as to better improve the sinusoidal saturation of magnetic flux in unit area. It will be appreciated that the permanent magnets 300 in the first and second slot segments 221, 222 may also be provided in other shapes, not being limited solely herein.
In one embodiment, the permanent magnets 300 in the first magnetic steel groove 210 may be configured to be arc-shaped to facilitate processing, manufacturing and installation, and may be combined with the permanent magnets 300 in the second magnetic steel groove 220 to better improve the sinusoidal saturation of magnetic flux per unit area.
In one embodiment, the first groove section 221 and the second groove section 222 are rectangular in shape for convenience in design and manufacture.
In one embodiment, the two ends of the first magnetic steel groove 210 are respectively provided with a first outer magnetic barrier hole, the first outer magnetic barrier holes are extended from the corresponding ends of the first magnetic steel groove 210 towards the direction of the outer peripheral surface of the rotor core 100, and since the magnetic permeability of the first outer magnetic barrier holes is lower than that of the rotor core 100 and the magnetic resistance is also larger, the first outer magnetic barrier holes form magnetic shielding walls which are difficult to pass through as magnetic fluxes in the magnetic circuit of the rotor of the structural group 200, namely, the first outer magnetic barrier holes form a leakage magnetic flux suppression structure. The distance between the first outer magnetic barrier hole and the outer circumferential surface of the rotor core 100 is small, that is, a first thin-wall structure is formed between the first outer magnetic barrier hole and the outer circumferential surface of the rotor core 100, and magnetic flux is easily concentrated at the first thin-wall structure between the first outer magnetic barrier hole and the outer circumferential surface of the rotor core 100, and in order to reduce magnetic leakage during operation of the motor, the first thin-wall structure is often required to be thinner, so that the magnetic flux at the first thin-wall structure is generally in a saturated state, which causes the armature reaction demagnetizing field to pass through the end of the permanent magnet 300 in the first magnetic steel slot 210. The first outer barrier hole is provided and thus the magnetic flux passing through the permanent magnet 300 in the first magnetic steel groove 210 is reduced to improve the anti-demagnetization ability because the magnetic flux hardly passes through the first outer barrier hole.
In one embodiment, one end of the first slot segment 221 and the second slot segment 222 near the outer peripheral surface of the rotor core 100 is respectively provided with a second outer magnetic barrier hole, and the two second outer magnetic barrier holes are respectively extended from the first slot segment 221 or the second slot segment 222 towards the outer peripheral surface of the rotor core 100, and since the magnetic permeability of the second outer magnetic barrier hole is lower than that of the rotor core 100, the magnetic resistance of the second outer magnetic barrier hole is also larger, so that the second outer magnetic barrier hole forms a magnetic shielding wall which is difficult to pass by magnetic flux in the magnetic circuit of the rotor of the structural group 200, namely, a leakage magnetic flux suppression structure is formed at the second outer magnetic barrier hole. And the distance between the second outer magnetic barrier hole and the outer circumferential surface of the rotor core 100 is small, that is, a second thin-walled structure is formed between the second outer magnetic barrier hole and the outer circumferential surface of the rotor core 100, and the magnetic flux is easily concentrated at the second thin-walled structure between the second outer magnetic barrier hole and the outer circumferential surface of the rotor core 100, and in order to reduce the leakage flux when the motor is operated, it is often necessary to provide the second thin-walled structure to be thin so that the magnetic flux at the second thin-walled structure is normally in a saturated state, which causes the armature reaction demagnetizing field to pass through the ends of the permanent magnets 300 in the first slot section 221 and the second slot section 222. The second outer magnetic barrier hole is provided so that the magnetic flux of the permanent magnet 300 passing through the first slot segment 221 and the second slot segment 222 is reduced to improve the anti-demagnetizing ability because the magnetic flux hardly passes through the second outer magnetic barrier hole.
In addition, the second outer magnetic barrier holes are arranged, so that magnetic flux generated by the stator can be more easily linked to the rotor, the utilization rate of a magnetic field of the stator is improved, and the efficiency is improved.
Optionally, the second magnetic steel groove 220 further includes a first folding groove 223 and a second folding groove 224, where the first folding groove 223 is communicated with one end of the first groove section 221 near the center of the rotor core 100 and extends toward the outer circumferential surface of the rotor core 100, and the second folding groove 224 is communicated with one end of the second groove section 222 near the center of the rotor core 100 and extends toward the outer circumferential surface of the rotor core 100, and the distance between the first folding groove 223 and the second folding groove 224 increases gradually in the direction near the center of the rotor core 100. By providing the first slot segment 221 and the second slot segment 222, magnetic leakage can be reduced, particularly, the magnetic leakage of the permanent magnet 300 in the first slot segment 221 and the second slot segment 222 can be reduced, and the magnetic field utilization rate can be improved.
Optionally, the minimum distance between the first folding groove 223 and the second folding groove 224 is K 1, and the maximum distances between the first folding groove 223 and the second folding groove 224 are K 2,K1 and K 2: the magnetic flux leakage of the permanent magnet 300 mounted in the first and second folding grooves 223 and 224 can be reduced by 0.15< K 1/K2 <0.25, so that the counter potential of the motor can be improved, the reluctance torque can be improved, and the efficiency of the motor can be improved.
Referring to fig. 2, fig. 2 is a schematic diagram showing the change of the counter potential with K 1/K2, and as shown in fig. 2, when K 1/K2 is smaller than 0.15, the counter potential gradually increases with the increase of K 1/K2, and when K 1/K2 is larger than 0.15, the counter potential is flat and is above 216V, so that it can be seen that the counter potential of the motor is favorable to be excellent by limiting K 1/K2 to be larger than 0.15.
Secondly, since the greater the ratio of K 1/K2, the greater the distance between the first and second folding grooves 223 and 224, that is, the greater the physical weight of the rotor core 100, the greater the centrifugal force of the rotor is, and thus the counter potential of the motor is reduced, as can be seen from fig. 2, when K 1/K2 is greater than 0.2, the counter potential is substantially gentle, so that the solution limits K 1/K2 to between 0.15 and 0.25, which is beneficial to increasing the counter potential of the motor, and simultaneously reduces the weight of the rotor, thereby reducing the centrifugal force of the rotor, and further increasing the counter potential of the rotor, and improving the efficiency of the motor.
Further, the included angle between the first folding groove 223 and the first groove section 221 ranges from 75 ° to 85 °, which facilitates the process molding.
Optionally, the structure group 200 further includes a magnetic barrier hole 230, where the magnetic barrier hole 230 is disposed between the first slot segment 221 and the second slot segment 222 and is disposed near the center of the rotor core 100. The magnetic barrier holes 230 can improve the gas-liquid flow area, reduce the dosage of the magnet, reduce the cost, and the magnetic barrier holes 230 can better reduce magnetic leakage and improve the magnetic field utilization rate.
Wherein the magnetic barrier hole 230 is a circular hole.
Optionally, the structure group 200 further includes a plurality of magnetic barrier grooves 240, where the plurality of magnetic barrier grooves 240 are spaced between the inner groove wall of the first magnetic steel groove 210 and the outer circumferential surface of the rotor core 100. In use, the magnetic permeability at the first magnetic steel slot 210, the second magnetic steel slot 220, the magnetic barrier hole 230, and the magnetic barrier slot 240 of the structural group 200 is very small, while the magnetic permeability at other locations on the rotor core 100 is relatively very large, which causes the first magnetic steel slot 210, the second magnetic steel slot 220, the magnetic barrier hole 230, and the magnetic barrier slot 240 to define the flow direction of the magnetic flux in the rotor core 100 to form magnetic poles in the rotor core 100, and form reluctance torque when the stator magnetic field drives the rotor to rotate.
It will be appreciated that the flux barriers 240 are disposed between the side walls of the second magnetic steel slot 220 and the outer circumferential surface of the rotor core 100, that is, the flux barriers 240 are located within the range of action of the permanent magnets 300 and the stator, and tangential components of interaction forces of the two ends of the flux barriers 240 with the stator teeth and the stator slots respectively tend to be opposite, so that forces between the stator teeth and the stator slots in each pole of the motor tend to cancel each other when the rotor rotates around the axis, thereby weakening cogging torque ripple and reducing permanent magnet motor rotational speed ripple.
The magnetic barrier groove 240 is disposed between the inner groove wall of the second magnetic steel groove 220 and the outer circumferential surface of the rotor core, so that the magnetic flux path can be standardized and the magnetic field harmonics in the air gap can be weakened on the basis of reducing the influence on the permanent magnet flux linkage. The magnetic saturation degree can be relieved, a magnetic barrier is formed in the rotating process of the motor rotor, so that the power density and the torque density of the motor are improved, the overload capacity of the motor is improved, the torque pulsation of the motor is effectively improved, the motor performance is greatly improved on the basis of reducing the consumption of the permanent magnet 300 of the motor, namely the production cost is reduced, and the product competitiveness is improved.
And, the arrangement of the magnetic barrier groove 240 can promote the gas-liquid flow area, reduce the magnet dosage, reduce the cost and reduce the complexity of the motor assembly process.
Furthermore, the magnetic barrier groove 240 is arranged, so that the gas-liquid flow area can be increased, and the cooling efficiency of the motor is increased.
Optionally, each structural group 200 is disposed in an axisymmetric pattern, and the plurality of magnetic barrier grooves 240 of each structural group 200 are disposed in an axisymmetric pattern with respect to the symmetry axis of the structural group 200; therefore, the processing technology is simpler, the influence of the armature magnetic field of the motor on the main magnetic field of the rotor can be further reduced, the load magnetic density of the motor is improved, the air gap magnetic density waveform of the motor is optimized, the radial force of the motor is further improved, the noise of the motor is reduced, and the cost performance of the motor is improved.
Wherein the magnetic barrier aperture 230 is located on the symmetry axis.
Optionally, the magnetic barrier slots 240 are arranged in a fan shape.
Further, the distance between the plurality of magnetic barrier grooves 240 and the outer circumferential surface of the rotor core 100 is greater than the thickness of the rotor punching sheet, and the distance between the plurality of magnetic barrier grooves 240 and the outer circumferential surface of the rotor core is in the range of 0.35mm to 1mm, so that the heat transfer efficiency can be ensured, and the probability of physical fracture between the magnetic barrier grooves 240 and the outer circumferential surface of the rotor core 100 after the motor heats can be reduced.
Further, the distance between any two of the barrier grooves 240 is greater than 2mm, so that the rigidity of the rotor core 100 can be secured.
Alternatively, the lengths of the plurality of barrier grooves 240 located at both sides of the symmetry axis of the structure group 200 gradually decrease in a direction away from the symmetry axis; in this way, the plurality of slender magnetic barrier grooves 240 can be guaranteed to well reduce the influence of the armature magnetic field of the motor on the main magnetic field of the rotor, and meanwhile, the air gap magnetic density waveform can be optimized, so that good noise reduction effect is guaranteed. The effect of the air gap generated between the barrier slots 240 on the improvement of the magnetic field profile generated by the permanent magnet 300 can be made more remarkable. Of course, the present invention is not limited thereto, and in other embodiments, the lengths of the plurality of magnetic barrier grooves 240 located at both sides of the symmetry axis may be unchanged in the direction away from the symmetry axis.
Compared with the prior art, the rotor provided by the embodiment of the application has the advantages that the rotor is provided with the plurality of structural groups 200 on the rotor core 100, each structural group 200 comprises the first magnetic steel groove 210, the second magnetic steel groove 220, the magnetic barrier groove 240 and the magnetic barrier hole 230, the plurality of magnetic barrier grooves 240 are arranged between the inner groove wall of the second magnetic steel groove 220 and the outer peripheral surface of the rotor core 100 at intervals, so that when in use, reluctance torque is generated by being matched with the stator of the motor, and the permanent magnets 300 are respectively arranged in the first magnetic steel groove 210 and the second magnetic steel groove 220, so that when in use, permanent magnet torque is generated by being matched with the stator of the motor, and the output torque is improved; in addition, the magnetic barrier groove 240 is provided, so that the gas-liquid flow area can be increased, and compared with the structure that the permanent magnet 300 is arranged in each hole of the structure group 200, the magnetic barrier groove has the advantages of smaller magnet consumption, lower cost and more convenient assembly.
In addition, in consideration of the press working of the silicon steel sheet and the mechanical strength at the time of use, the corners may be chamfered as necessary at the time of working and manufacturing the first magnetic steel groove 210, the second magnetic steel groove 220, and the barrier groove 240.
The invention also provides a motor, which comprises a rotor, wherein the specific structure of the rotor refers to the embodiment, and because the motor adopts all the technical schemes of all the embodiments, the motor at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted.
The invention also provides a compressor, which comprises a motor, wherein the specific structure of the motor refers to the embodiment, and as the compressor adopts all the technical schemes of all the embodiments, the compressor at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (11)
1. A rotor, comprising:
The rotor iron core comprises a plurality of structural groups, wherein the structural groups comprise first magnetic steel grooves, the first magnetic steel grooves are arc-shaped and bent towards the circle center deviating from the rotor iron core, and the first magnetic steel grooves are used for mounting permanent magnets;
The radius of the outer groove wall of the first magnetic steel groove is R 1, the radius R 2 of the rotor core, and the relation between R 1 and R 2 is: 0.55> R 1/R2 >0.4.
2. The rotor of claim 1, wherein the structural group further comprises a second magnetic steel groove provided between an inner groove wall of the first magnetic steel groove and an outer circumferential surface of the rotor core.
3. The rotor of claim 2, wherein the second magnetic steel groove includes a first groove section and a second groove section disposed at a distance from each other, and the distances between the first groove section and the second groove section gradually increase in a direction away from the center of the rotor core.
4. The rotor of claim 3, wherein the second magnetic steel groove further comprises a first folding groove and a second folding groove, the first folding groove is communicated with one end of the first groove section close to the center of the rotor core and extends towards the outer circumferential surface of the rotor core, the second folding groove is communicated with one end of the second groove section close to the center of the rotor core and extends towards the outer circumferential surface of the rotor core, and the distance between the first folding groove and the second folding groove is gradually increased in the direction close to the center of the rotor core.
5. The rotor of claim 4 wherein the minimum distance between the first and second folds is K 1, the maximum distance between the first and second folds is K 2, and the relationships between K 1 and K 2 are: 0.15< K 1/K2 <0.25.
6. A rotor according to claim 3, wherein the structural group further comprises a magnetic barrier hole provided between the first slot section and the second slot section and disposed near the center of the rotor core.
7. A rotor according to claim 1, wherein the structural groups are arranged in an axisymmetric pattern.
8. The rotor of claim 7, wherein the structural group further comprises a plurality of magnetic barrier grooves, the plurality of magnetic barrier grooves being provided at intervals between an inner groove wall of the first magnetic steel groove and an outer circumferential surface of the rotor core.
9. The rotor of claim 8, wherein lengths of the plurality of barrier grooves located at both sides of the symmetry axis of the structural group gradually decrease in a direction away from the symmetry axis.
10. An electric machine comprising a rotor as claimed in any one of claims 1 to 9.
11. A compressor comprising the motor of claim 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410480472.5A CN118100487B (en) | 2024-04-22 | 2024-04-22 | Rotor, motor and compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410480472.5A CN118100487B (en) | 2024-04-22 | 2024-04-22 | Rotor, motor and compressor |
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| CN118100487B CN118100487B (en) | 2024-07-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118449301A (en) * | 2024-07-08 | 2024-08-06 | 广东美芝制冷设备有限公司 | Rotor assembly, motor and compressor |
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| US20200185990A1 (en) * | 2018-12-10 | 2020-06-11 | Honda Motor Co., Ltd. | Rotor and manufacturing method of arc magnet for rotor |
| CN218183098U (en) * | 2022-08-15 | 2022-12-30 | 大洋电机(武汉)研究院有限公司 | Rotor of permanent magnet auxiliary synchronous reluctance motor and motor |
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| CN105075079A (en) * | 2013-02-14 | 2015-11-18 | 三菱电机株式会社 | Permanent magnet embedded motor, compressor and freezing air conditioner |
| CN103762760A (en) * | 2014-01-07 | 2014-04-30 | 广东美芝制冷设备有限公司 | Motor for rotary type compressor and rotary type compressor with motor |
| US20200185990A1 (en) * | 2018-12-10 | 2020-06-11 | Honda Motor Co., Ltd. | Rotor and manufacturing method of arc magnet for rotor |
| CN218183098U (en) * | 2022-08-15 | 2022-12-30 | 大洋电机(武汉)研究院有限公司 | Rotor of permanent magnet auxiliary synchronous reluctance motor and motor |
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| CN118449301A (en) * | 2024-07-08 | 2024-08-06 | 广东美芝制冷设备有限公司 | Rotor assembly, motor and compressor |
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| CN118100487B (en) | 2024-07-09 |
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