CN116191726A - Motor rotor with magnetic barrier, motor and compressor - Google Patents
Motor rotor with magnetic barrier, motor and compressor Download PDFInfo
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- CN116191726A CN116191726A CN202211270424.0A CN202211270424A CN116191726A CN 116191726 A CN116191726 A CN 116191726A CN 202211270424 A CN202211270424 A CN 202211270424A CN 116191726 A CN116191726 A CN 116191726A
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- 230000004888 barrier function Effects 0.000 title claims abstract description 161
- 238000004804 winding Methods 0.000 claims description 4
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 6
- 150000002910 rare earth metals Chemical class 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 29
- 238000004519 manufacturing process Methods 0.000 description 12
- 230000004907 flux Effects 0.000 description 11
- 239000002356 single layer Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 230000005347 demagnetization Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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]
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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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
- H02K1/246—Variable reluctance rotors
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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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 invention discloses a motor rotor with a magnetic barrier, a motor and a compressor, wherein the motor rotor with the magnetic barrier comprises a rotor iron core, a plurality of curved slots and a plurality of magnetic barrier groups; the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; the magnetic barrier groups are arranged on one side of the curved slots, which is far away from the circle center of the rotor core, and each magnetic barrier group comprises at least one layer of a plurality of magnetic barrier holes which are arranged at intervals along the extending direction of the slot walls of the curved slots; the included angle formed by connecting lines between the two ends of one layer of magnetic barrier hole and the circle center of the rotor core is a, and the included angle is more than or equal to (1/8) ×2pi/p, wherein p is the pole number of the motor where the motor rotor with the magnetic barrier is located. The motor rotor with the magnetic barrier can improve the motor efficiency by improving the reluctance torque, thereby reducing the consumption of rare earth permanent magnets.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor rotor with magnetic barriers, a motor and a compressor.
Background
A permanent magnet synchronous motor (IPM) is a motor in which a layer of permanent magnets is placed inside a rotor, and mainly uses permanent magnet torque and reluctance torque as assistance.
The resultant formula of reluctance torque and permanent magnet torque is as follows:
t=mp (Lq-Ld) id iq+mp ψpm iq. Wherein,,
t is the output torque of the motor, and the value of T is improved, so that the performance of the motor can be improved; the first term in the equation after T is reluctance torque, and the second term is permanent magnet torque; the method comprises the steps that ψPM is the maximum value of stator-rotor coupling magnetic flux generated by a motor permanent magnet, m is the phase number of a stator conductor, ld and Lq are d-axis and q-axis inductances respectively, wherein the d-axis refers to an axis coincident with the axis of a main magnetic pole, the q-axis refers to an axis perpendicular to the axis of the main magnetic pole, and the perpendicular refers to an electrical angle; id. iq is a component of the armature current in the d-axis and q-axis directions, respectively.
In the prior art, the performance of the motor is mainly improved by improving the performance of the permanent magnet, namely, the output torque value is improved by improving the permanent magnet torque, so that the motor efficiency is improved, and the common practice is to arrange the rare earth permanent magnet. However, since rare earth is a non-renewable resource and is expensive, such motors have a limited wider application. In addition, the motor performance is improved only by improving the performance of the permanent magnet, and the urgent requirement for further improving the motor efficiency cannot be met. In addition, the current motor mostly adopts the structure that sets up two-layer or more than two-layer permanent magnet to lead to the motor to be with high costs, anti demagnetizing ability is weak, adopts multilayer permanent magnet structure simultaneously, influences motor production beat, leads to the fact the influence to motor rotor's performance.
Disclosure of Invention
The main purpose of the invention is to provide a motor rotor with magnetic barriers, which aims to improve the motor efficiency by improving reluctance torque so as to reduce the dosage of rare earth permanent magnets.
In order to achieve the above object, the present invention provides a motor rotor with magnetic barrier, the motor rotor with magnetic barrier comprising:
a rotor core;
the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; and
the magnetic barrier groups are arranged on one sides of the curved slots, far away from the circle center of the rotor core, and comprise at least one layer of magnetic barrier holes which are arranged at intervals along the d-axis direction of the motor rotor with the magnetic barrier, the number of one layer of magnetic barrier holes is multiple, and the magnetic barrier holes are arranged at intervals along the extending direction of the slot walls of the curved slots; and an included angle formed by connecting lines between two ends of the magnetic barrier hole and the circle center of the rotor core is a, and a is more than or equal to (1/8) (2 pi/p), wherein p is the pole number of the motor where the motor rotor with the magnetic barrier is located.
In an embodiment, the curved slot has a first side wall and a second side wall which are oppositely arranged, and the first side wall and the second side wall are both convexly arranged towards the center of the rotor core.
In one embodiment, a straight-axis magnetic conduction channel is formed between any two adjacent magnetic barrier holes in one layer of the magnetic barrier holes.
In an embodiment, the motor rotor with the magnetic barrier further comprises a plurality of permanent magnets, and the plurality of permanent magnets are mounted on the plurality of curved slots.
In an embodiment, the thickness of the permanent magnet in the d-axis direction of the motor rotor with the magnetic barrier is T, the magnetic barrier hole has a first side and a second side which are oppositely arranged, the second side is located at one side of the first side away from the center of the rotor core, and the distance from the first side to the second side is the thickness H of the magnetic barrier hole, so that T > H is satisfied.
In an embodiment, the thickness of the middle portion of the permanent magnet is greater than the thickness of both ends of the permanent magnet in a section perpendicular to the axial direction of the motor rotor with the magnetic barrier.
In one embodiment, a gap is formed between two ends of the permanent magnet and two ends of the curved slot in which the permanent magnet is embedded, and the gap is used for filling a non-magnetic medium.
In one embodiment, the curved slots are arranged in a U-shape.
In one embodiment, the curved slots are arranged in a V-shape.
In one embodiment, the curved slots are arranged in an arc shape.
The invention also provides a motor, which comprises the motor rotor with the magnetic barrier and a stator sleeved on the outer side of the motor rotor with the magnetic barrier, wherein the stator comprises a stator iron core and windings wound on stator teeth. The motor rotor with the magnetic barriers comprises a rotor core, a plurality of curved slots and a plurality of magnetic barrier groups; the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; the magnetic barrier groups are arranged on one side of the curved slots, which is far away from the circle center of the rotor core, and each magnetic barrier group comprises at least one layer of magnetic barrier holes which are arranged at intervals along the d-axis direction of the motor rotor with the magnetic barrier, the number of one layer of magnetic barrier holes is multiple, and the magnetic barrier holes are arranged at intervals along the extending direction of the slot walls of the curved slots; and an included angle formed by connecting lines between two ends of the magnetic barrier hole and the circle center of the rotor core is a, and a is more than or equal to (1/8) (2 pi/p), wherein p is the pole number of the motor where the motor rotor with the magnetic barrier is located.
Optionally, the thickness of the motor rotor with the magnetic barrier in the axial direction thereof is not smaller than the thickness of the stator in the axial direction thereof.
The invention also provides a compressor, which comprises a motor, wherein the motor comprises the motor rotor with the magnetic barrier and a stator sleeved on the outer side of the motor rotor with the magnetic barrier, and the stator comprises a stator iron core and windings wound on stator teeth. The motor rotor with the magnetic barriers comprises a rotor core, a plurality of curved slots and a plurality of magnetic barrier groups; the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; the magnetic barrier groups are arranged on one side of the curved slots, which is far away from the circle center of the rotor core, and each magnetic barrier group comprises at least one layer of magnetic barrier holes which are arranged at intervals along the d-axis direction of the motor rotor with the magnetic barrier, the number of one layer of magnetic barrier holes is multiple, and the magnetic barrier holes are arranged at intervals along the extending direction of the slot walls of the curved slots; and an included angle formed by connecting lines between two ends of the magnetic barrier hole and the circle center of the rotor core is a, and a is more than or equal to (1/8) (2 pi/p), wherein p is the pole number of the motor where the motor rotor with the magnetic barrier is located.
The motor rotor with the magnetic barriers comprises a rotor core, a plurality of curved slots and a plurality of magnetic barrier groups; the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; the magnetic barrier groups are arranged on one side of the curved slots, which is far away from the circle center of the rotor core, and each magnetic barrier group comprises at least one layer of magnetic barrier holes which are arranged at intervals along the d-axis direction of the motor rotor with the magnetic barrier, the number of one layer of magnetic barrier holes is multiple, and the magnetic barrier holes are arranged at intervals along the extending direction of the slot walls of the curved slots; and an included angle formed by connecting lines between two ends of the magnetic barrier hole and the circle center of the rotor core is a, and a is more than or equal to (1/8) (2 pi/p), wherein p is the pole number of the motor where the motor rotor with the magnetic barrier is located. When the included angle a meets a & gtor (1/8) & gtpi/p, the q-axis inductance of the motor rotor can be obviously improved, the difference between the d-axis inductance and the q-axis inductance of the motor is increased, the reluctance torque of the motor is improved, the unit current generates larger electromagnetic torque, and the efficiency of the motor is improved. The curved slot is mainly used for placing the permanent magnet, and is of a single-layer structure, so that the thickness of the permanent magnet placed in the curved slot can be increased, the demagnetization resistance of the permanent magnet is improved, and the reliability of the motor is ensured. Meanwhile, the amount of the permanent magnets placed in the curved slots with the single-layer structure is reduced compared with that of the permanent magnets with the double-layer structure, so that the production cost of the motor rotor can be reduced. Meanwhile, compared with the motor rotor with the double-layer curved groove structure, the motor rotor with the single-layer curved groove structure has higher production efficiency.
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 diagram of an embodiment of a motor rotor with magnetic barriers according to the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic view of another embodiment of a motor rotor with magnetic barriers according to the present invention;
fig. 4 is a schematic diagram showing the relationship between the output torque of the motor and the range change of the included angle a.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the |
| 10 | Motor rotor with |
310 | |
| 100 | |
311 | |
| 200 | Curved |
312 | |
| 210 | |
400 | Direct axis magnetic conduction channel |
| 220 | A |
500 | |
| 300 | |
600 | Cross-axis magnetic conduction channel |
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, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
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, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet 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 invention provides an embodiment of a motor rotor with a magnetic barrier, namely a motor rotor of a permanent magnet auxiliary synchronous reluctance motor, which is mainly applied to an air conditioner compressor, an electric vehicle and a fan system. Synchronous reluctance motors have multiple layers of rotor magnetic barriers and operate by virtue of reluctance torque generated asymmetrically by rotor magnetic circuits. The motor has the advantages of low cost, simple manufacture and small rotor loss, but has the disadvantages of low power factor and torque density and larger torque pulsation. In order to improve the torque and the power factor of the motor, a certain low-performance permanent magnet (ferrite or bonded NdFeB) can be inserted into the rotor magnetic barrier for auxiliary excitation, so that the excitation component of motor current can be reduced and the permanent magnet torque can be generated, namely the permanent magnet auxiliary synchronous reluctance motor.
In designing permanent magnets in a flux barrier, the effect of the permanent magnetic flux on the saturation level of the magnetic circuit needs to be considered. The magnetic circuit saturation is easily caused by the overlarge permanent magnetic flux, so that the salient pole rate of the rotor is reduced; and the improvement of torque and power factor is smaller by the small permanent magnetism. The low-performance permanent magnet has a low coercive force, but has a good linearity of a demagnetization curve.
The resultant formula of reluctance torque and permanent magnet torque is as follows:
t=mp (Lq-Ld) id iq+mp ψpm iq. Wherein,,
t is the output torque of the motor, and the value of T is improved, so that the performance of the motor can be improved; the first term in the equation after T is reluctance torque, and the second term is permanent magnet torque; the method comprises the steps that ψPM is the maximum value of stator-rotor coupling magnetic flux generated by a motor permanent magnet, m is the phase number of a stator conductor, ld and Lq are d-axis and q-axis inductances respectively, wherein the d-axis refers to an axis coincident with the axis of a main magnetic pole, the q-axis refers to an axis perpendicular to the axis of the main magnetic pole, and the perpendicular refers to an electrical angle; id. iq is a component of the armature current in the d-axis and q-axis directions, respectively. According to the formula, increasing the inductance difference between Ld and Lq and the psi pm can increase the output torque, that is, increasing one of the reluctance torque and the permanent magnet torque can increase the total output torque of the motor while maintaining the other of the reluctance torque and the permanent magnet torque unchanged, thereby increasing the efficiency of the motor.
In the prior art, the performance of the motor is mainly improved by improving the performance of the permanent magnet, namely, the output torque value is improved by improving the permanent magnet torque, so that the motor efficiency is improved, and the common practice is to arrange the rare earth permanent magnet. However, since rare earth is a non-renewable resource and is expensive, such motors have a limited wider application. In addition, the motor performance is improved only by improving the performance of the permanent magnet, and the urgent requirement for further improving the motor efficiency cannot be met. In addition, the current motor mostly adopts the structure that sets up two-layer or more than two-layer permanent magnet to lead to the motor to be with high costs, anti demagnetizing ability is weak, adopts multilayer permanent magnet structure simultaneously, influences motor production beat, leads to the fact the influence to motor rotor's performance.
Referring to fig. 1 to 3, in an embodiment of the present invention, the motor rotor 10 with magnetic barriers includes a rotor core 100, a plurality of curved slots 200, and a plurality of magnetic barrier groups 300; the plurality of curved slots 200 are disposed on the rotor core 100 and are arranged at intervals along the circumferential direction of the rotor core 100, and two ends of the curved slots 200 extend toward the edge of the rotor core 100; the plurality of magnetic barrier groups 300 are arranged on one side of the plurality of curved slots 200 away from the center of the rotor core 100, the magnetic barrier groups 300 comprise at least one layer of magnetic barrier holes 310 which are arranged at intervals along the d-axis direction of the motor rotor 10 with magnetic barriers, the number of the magnetic barrier holes 310 of one layer is a plurality, and the plurality of magnetic barrier holes 310 are arranged at intervals along the extending direction of the slot walls of the curved slots 200; the included angle formed by the connection lines between the two ends of the magnetic barrier hole 310 and the center of the rotor core 100 is a, which satisfies a ∈ (1/8) × (2pi/p), where p is the number of poles of the motor where the motor rotor 10 with magnetic barrier is located.
Specifically, the motor rotor includes a rotor core 100 and a permanent magnet 500, the rotor core 100 being laminated from silicon steel plates and having a certain lamination height. The rotor core 100 is driven by the magnetic force of the permanent magnet 500, and the motor rotor can rotate relative to the motor stator to realize the normal operation of the motor. The rotor core 100 is formed by laminating high magnetic conductive materials or silicon steel punched sheets, and has high magnetic flux rate, high structural strength and convenient processing.
The plurality of curved slots 200 are formed in the rotor core 100, the curved slots 200 are provided in a curved shape, and the curved slots 200 may have one curved portion or may have a plurality of curved portions, and the shape of the curved slots 200 is substantially wavy when the curved slots 200 have a plurality of curved portions. The curved slots 200 are arranged at intervals along the circumferential direction of the rotor core 100, and are specifically uniformly distributed along the circumferential direction with the center of the rotor core 100 as the center of the circle, two ends of the curved slots 200 extend towards the edge of the rotor core 100, and an area for arranging a plurality of magnetic barrier groups 300 is formed between the curved slots 200 and the edge of the rotor core 100, and a plurality of the magnetic barrier groups 300 are arranged on one side of the curved slots 200 away from the center of the circle of the rotor core 100. It should be noted that, the curved slots 200 are mainly used for mounting the permanent magnets 500, and the permanent magnets 500 have magnetic poles, so the number of the curved slots 200 is set to be even, as shown in fig. 1, 6 curved slots 200 are arranged at intervals along the circumferential direction of the rotor core 100, at least one permanent magnet 500 is placed in each curved slot 200, the polarities of the permanent magnets 500 in any two adjacent curved slots 200 are opposite, and a plurality of permanent magnets 500 are alternately distributed along the circumferential direction of the rotor core 100 according to the N pole and the S pole. In this embodiment, the plurality of curved slots 200 are configured as a single-layer structure, and compared with the motor rotor with a double-layer structure in the prior art, the permanent magnets 500 are placed in the curved slots 200 with a single-layer structure, so that the thickness of the permanent magnets 500 can be increased within a limited volume, thereby improving the anti-demagnetization capability of the permanent magnets 500 and improving the reliability of the motor; meanwhile, the production efficiency of the motor rotor with the single-layer curved groove 200 structure is higher; meanwhile, the amount of the permanent magnets 500 required to be placed in the curved slots 200 with the single-layer structure is relatively reduced, and the overall consumption of the permanent magnets 500 is reduced, so that the production cost of the rotor can be further reduced, and the production cost of the motor is further reduced.
The magnetic barrier set 300 includes at least one layer of magnetic barrier holes 310 arranged at intervals along the extending direction of the groove wall of the curved groove 200, and a plurality of layers of magnetic barrier holes 310 are provided, and the magnetic barrier holes 310 can be filled with air or other non-magnetic conductive materials. The groove wall of the curved groove 200 may be a first side wall 210 near the edge of the rotor core 100, or may be a second side wall 220 near the center of the rotor core 100. The extending directions of the first sidewall 210 and the second sidewall 220 may be the same or different, and in this embodiment, the extending directions of the first sidewall 210 and the second sidewall 220 are substantially the same, so the plurality of magnetic barrier holes 310 are arranged at intervals along the extending direction of the first sidewall 210 of the curved slot 200 or along the extending direction of the second sidewall 220 of the curved slot 200. A straight-axis magnetic conduction channel 400 is formed between two adjacent magnetic barrier holes 310, the magnetic resistance of the straight-axis magnetic conduction channel 400 in the d-axis direction is small, the magnetic flux is high, and the inductance Ld is large; the q-axis direction at the center line of the magnetic barrier hole 310 has high magnetic resistance, the inductance Lq is small, and the inductance difference between the d-axis direction and the q-axis direction can be increased, so that the torque output capacity of the motor is improved. On the other hand, the magnetic barrier hole 310 is disposed between the first side wall 210 of the curved slot 200 and the edge of the rotor core 100, which can normalize the magnetic line path while reducing the influence on the permanent magnetic force, weaken the magnetic field harmonic wave in the air gap, and relieve the magnetic saturation degree, and form a magnetic barrier in the rotation process of the motor rotor, so as to improve the power density and torque density of the motor, improve the overload capacity of the motor, effectively improve the torque pulsation of the motor, and greatly improve the motor performance and the product competitiveness while reducing the consumption of the permanent magnet 500 of the motor, that is, reducing the production cost.
Referring to fig. 1 and fig. 4, the included angle formed by the connection lines between the two ends of the magnetic barrier hole 310 and the center of the rotor core 100 is a, and when the included angle a satisfies a (1/8) ×2pi/p) (p is the number of poles of the motor where the motor rotor 10 with the magnetic barrier is located), the q-axis inductance of the motor rotor can be significantly improved, so that the difference between the d-axis inductance and the q-axis inductance of the motor is increased, which is more beneficial to improving the reluctance torque of the motor, and the unit current generates a larger electromagnetic torque, thereby improving the efficiency of the motor.
The motor rotor 10 with magnetic barriers comprises a rotor core 100, a plurality of curved slots 200 and a plurality of magnetic barrier groups 300; the plurality of curved slots 200 are disposed on the rotor core 100 and are arranged at intervals along the circumferential direction of the rotor core 100, and two ends of the curved slots 200 extend toward the edge of the rotor core 100; the plurality of magnetic barrier groups 300 are arranged on one side of the plurality of curved slots 200 away from the center of the rotor core 100, the magnetic barrier groups 300 comprise at least one layer of magnetic barrier holes 310 which are arranged at intervals along the d axis direction of the motor rotor 10 with magnetic barriers, the number of the magnetic barrier holes 310 of one layer is a plurality, and the plurality of magnetic barrier holes 310 are arranged at intervals along the circumferential direction of the rotor core 100; the included angle formed by the connection lines between the two ends of the magnetic barrier hole 310 and the center of the rotor core 100 is a, which satisfies a ∈ (1/8) × (2pi/p), where p is the number of poles of the motor where the motor rotor 10 with magnetic barrier is located. When the included angle a meets a & gtor (1/8) & gtpi/p, the q-axis inductance of the motor rotor can be obviously improved, the difference between the d-axis inductance and the q-axis inductance of the motor is increased, the reluctance torque of the motor is improved, the unit current generates larger electromagnetic torque, and the efficiency of the motor is improved. The curved slot 200 is mainly used for placing the permanent magnet 500, and the curved slot 200 is of a single-layer structure, so that the thickness of the permanent magnet 500 placed in the curved slot 200 can be increased, the anti-demagnetization capability of the permanent magnet 500 is improved, and the reliability of the motor is ensured. Meanwhile, the amount of the permanent magnets 500 placed in the curved slots 200 of the single-layer structure may be reduced as compared with the amount of the permanent magnets 500 of the double-layer structure, so that the production cost of the motor rotor may be reduced. Meanwhile, compared with the motor rotor with the double-layer curved groove 200, the motor rotor with the single-layer curved groove 200 has higher production efficiency.
Referring to fig. 1, in the above embodiment, the curved slot 200 has a first side wall 210 and a second side wall 220 that are disposed opposite to each other, and the first side wall 210 and the second side wall 220 are both protruding toward the center of the rotor core 100. Specifically, the curved slot 200 has a first side wall 210 and a second side wall 220 that are disposed opposite to each other, the first side wall 210 is disposed near the center of the rotor core 100, the second side wall 220 is disposed far away from the center of the rotor core 100, and since the magnetic barrier group 300 includes at least one layer of magnetic barrier holes 310 that are circumferentially spaced along the rotor core 100, the number of the magnetic barrier holes 310 is plural, the arrangement of the magnetic barrier holes 310 requires a certain spatial position, the second side wall 220 is disposed toward the edge of the rotor core 100, so that a region is formed between the second side wall 220 and the edge of the rotor core 100, and the magnetic barrier groups 300 are disposed on one side of the curved slot 200 that is far away from the center of the rotor core 100, i.e., in the region formed between the second side wall 220 and the edge of the rotor core 100.
Referring to fig. 1 to 3, further, a straight-axis magnetic conduction channel 400 is formed between any two adjacent magnetic barrier holes 310 in one layer of the magnetic barrier holes 310. Specifically, the direct-axis magnetic conduction channel 400 has small magnetic resistance in the d-axis direction, high magnetic flux and large inductance Ld; the q-axis direction at the center line of the magnetic barrier hole 310 has high magnetic resistance, and the inductance Lq is small, so that the inductance difference between the d-axis direction and the q-axis direction can be increased, that is, the value of (Lq-Ld) in the formula t=mp (Lq-Ld) id iq+mp+ψpm iq is increased, thereby improving the torque output capability of the motor. The surface of the magnetic conduction channel can be coated with magnetic conduction materials, so that a better magnetic conduction effect is achieved.
Referring to fig. 1 to 3, in an embodiment, the motor rotor 10 with magnetic barrier further includes a plurality of permanent magnets 500, and the plurality of permanent magnets 500 are installed in the plurality of curved slots 200. Specifically, to ensure the performance of the motor rotor 10 having the magnetic barrier, the number of the permanent magnets 500 is set to be not less than the number of the curved slots 200, and at least one permanent magnet 500 should be placed in each of the curved slots 200. The shape of the permanent magnet 500 is adapted to the shape of the curved groove 200, and at least two opposite sides of the permanent magnet 500 are abutted against the inner wall surface of the curved groove 200, so as to ensure the stability of the permanent magnet 500 after being mounted in the curved groove 200. In terms of selecting materials of the permanent magnet 500, in order to increase the permanent magnet torque of the motor as much as possible, it is generally desirable to select a permanent magnet 500 with relatively high performance, and the permanent magnet 500 is used in an amount that fills the curved slot 200 as much as possible, but in terms of utilizing the reluctance torque, the higher the residual magnetic flux density of the permanent magnet 500 is, the better, and as the residual magnetic flux density of the permanent magnet 500 is increased, the rotor of the motor is saturated, resulting in a decrease in inductance. Wherein the rotor magnetic circuit saturation has a greater impact on q-axis inductance. In addition, it was found through research that an appropriate amount of residual magnetic flux density of the permanent magnet 500 may cause a certain saturation of the gap between both ends of the permanent magnet 500 and both ends of the curved slot 200, which is very advantageous for reducing d-axis inductance. Since the main output torque of the motor is reluctance torque, and particularly the motor enters a high-speed weak magnetic area, the proportion of the reluctance torque in the whole electromagnetic torque is further increased, and therefore, the influence of the material performance of the permanent magnet 500 on the difference value of d-axis inductance and q-axis inductance is very necessary.
Referring to fig. 1, in an embodiment, the permanent magnet 500 has a thickness T in the d-axis direction of the motor rotor 10 with the magnetic barrier, the magnetic barrier hole 310 has a first side 311 and a second side 312 disposed opposite to each other, the second side 312 is located on a side of the first side 311 away from the center of the rotor core 100, and a distance from the first side 311 to the second side 312 is the thickness H of the magnetic barrier hole 310, so as to satisfy T > H. Specifically, the greater the thickness of the permanent magnet 500 in the direction of the d axis of the motor rotor 10 having the magnetic barrier, the higher the permanent magnet torque of the motor, thereby improving the output torque of the motor and the efficiency of the motor. Meanwhile, in order to ensure that the magnetic circuit in the quadrature magnetic path 600 is not blocked, the thickness of the magnetic barrier hole 310 should not be made too large, and thus the thickness of the permanent magnet 500 is set to be greater than that of one layer of the magnetic barrier hole 310. The thickness of the magnetic barrier hole 310 refers to the distance from the first side 311 to the second side 312 of the magnetic barrier hole 310, and if the first side 311 and the second side 312 are arranged in parallel, the thickness of the magnetic barrier hole 310 refers to the shortest distance from the first side 311 to the second side 312; if the first side 311 and the second side 312 are not parallel, the thickness of the magnetic barrier hole 310 refers to the distance from the first side 311 to the second side 312 of the magnetic barrier hole 310 near the middle portion thereof; if the magnetic barrier hole 310 is irregularly designed, the thickness of the magnetic barrier hole 310 may be an average value between the maximum distance and the minimum distance from the first side 311 to the second side 312.
Referring to fig. 1, in an embodiment, in a section perpendicular to an axial direction of the motor rotor 10 having the magnetic barrier, a thickness of a middle portion of the permanent magnet 500 is greater than a thickness of both ends of the permanent magnet 500. Specifically, the permanent magnet 500 may be configured to have a thick middle and thin ends, such that the thickness of the middle portion of the permanent magnet 500 is greater than the thickness of the ends thereof. Taking the arc-shaped permanent magnet 500 as an example, the arc-shaped permanent magnet 500 is usually easy to generate local demagnetization in the middle inner surface area of the permanent magnet 500, and the arc-shaped permanent magnet 500 is designed to be a structure with thick middle and thin two ends, so that the local demagnetization phenomenon of the arc-shaped permanent magnet 500 can be relieved. In addition, the permanent magnet 500 with different thickness can prevent the permanent magnet 500 from sliding in the curved slot 200, and improve the stability of the permanent magnet 500 in the curved slot 200. Further, a layer of the magnetic barrier hole 310 near the curved slot 200 forms a cross magnetic channel 600 with the curved slot 200, and if the permanent magnet 500 adopts a structure with a thick middle and thin two ends, the width of the cross magnetic channel 600 is increased, so as to increase the q-axis inductance, that is, increase the value of Lq, increase the inductance difference between Ld and Lq, increase the reluctance torque, and improve the torque output capability of the motor.
Referring to fig. 1 to 3, in an embodiment, a gap is formed between two ends of the permanent magnet 500 and two ends of the curved slot 200 in which the permanent magnet 500 is embedded, so that the situation that the d-axis armature magnetic potential acts on the end of the permanent magnet 500 in a concentrated manner is effectively avoided, and the demagnetizing current of the motor can be improved well. The voids may be filled with air and further the voids may be used to fill non-magnetically permeable media. Specifically, air or non-magnetic medium is filled in the gap, so that the conditions that the end part of the permanent magnet 500 is easy to demagnetize and unsaturated in magnetizing are avoided, and meanwhile, the demagnetizing resistance of the motor is improved.
Referring to fig. 3, in one embodiment, the curved slot 200 is disposed in a U-shape. Specifically, when the curved groove 200 is configured in a U shape, the curved groove 200 may be divided into a left portion, a bottom portion, and a right portion, which may be communicated with each other or blocked from each other, as long as the general shape thereof is ensured to be configured in a U shape. The permanent magnet 500 is rectangular and blocky, because the arc-shaped permanent magnet 500 is greatly influenced by materials in the aspect of molding, and the finishing procedures in the later stage of molding are more, and the molding and processing procedures of the rectangular permanent magnet 500 are relatively simple, so that the production efficiency can be improved by adopting the rectangular permanent magnet 500, and the universality is strong. The permanent magnet 500 may be placed in only any one of the three parts of the left, bottom and right, or in any two of the three parts of the left, bottom and right, or in all of the three parts of the left, bottom and right, without being particularly limited thereto.
In another embodiment, the curved slots 200 are arranged in a V-shape (not shown). Specifically, when the curved groove 200 is disposed in a V-shape, the curved groove 200 may be divided into a left half and a right half, and the permanent magnet 500 is disposed in a rectangular block shape. The permanent magnet 500 may be installed in the left half of the curved groove 200, in the right half of the curved groove 200, or in both the left and right halves.
Referring to fig. 1, in another embodiment, the curved slot 200 is disposed in an arc shape. Specifically, when the curved groove 200 is provided in an arc shape, the shape of the permanent magnet 500 may be provided in an arc shape, the shape of the permanent magnet 500 is adapted to the shape of the curved groove 200, and the permanent magnet 500 is adapted to be installed in the curved groove 200.
The invention also provides a motor which comprises a motor rotor 10 with a magnetic barrier and a stator sleeved outside the motor rotor 10 with the magnetic barrier, wherein the stator comprises a stator iron core and windings wound on stator teeth. The specific structure of the motor rotor 10 with the magnetic barrier refers to the above embodiments, and since the motor adopts all the technical solutions of all the embodiments, at least the motor rotor has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein. The motor can be applied to an air conditioner compressor, an electric vehicle, a fan system and the like, and can increase the utilization of reluctance torque of the motor, so that the efficiency of the motor is improved.
In one embodiment, the thickness of the motor rotor 10 with magnetic barrier in its axial direction is not smaller than the thickness of the stator in its axial direction (not shown). The permanent magnet 500 is installed in the curved slot 200 of the rotor core 100, and the thickness of the motor rotor 10 having the magnetic barrier is made thicker, so that the volume of the rotor core 100 in which the permanent magnet 500 is placed is made larger, thereby improving the permanent magnet torque of the motor and improving the output capacity of the motor.
The invention also provides a compressor comprising the motor. The specific structure of the motor refers to the above embodiments, and since the compressor adopts all the technical solutions of all the embodiments, at least the technical solutions of the embodiments have all the beneficial effects, and are not described in detail 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 (13)
1. An electric machine rotor having a magnetic barrier, comprising:
a rotor core;
the plurality of curved slots are arranged on the rotor core and are distributed at intervals along the circumferential direction of the rotor core, and two ends of each curved slot extend towards the edge of the rotor core; and
the magnetic barrier groups are arranged on one sides of the curved slots, far away from the circle center of the rotor core, and comprise at least one layer of magnetic barrier holes which are arranged at intervals along the d-axis direction of the motor rotor with the magnetic barrier, the number of one layer of magnetic barrier holes is multiple, and the magnetic barrier holes are arranged at intervals along the extending direction of the slot walls of the curved slots; and an included angle formed by connecting lines between two ends of the magnetic barrier hole and the circle center of the rotor core is a, and a is more than or equal to (1/8) (2 pi/p), wherein p is the pole number of the motor where the motor rotor with the magnetic barrier is located.
2. The motor rotor with magnetic barrier of claim 1, wherein the curved slot has a first side wall and a second side wall disposed opposite each other, the first side wall and the second side wall each protruding toward a center of the rotor core.
3. A motor rotor having a magnetic barrier as recited in claim 2, wherein a straight-axis magnetically conductive path is formed between any adjacent two of said barrier holes in one layer.
4. The motor rotor with magnetic barrier of claim 1, further comprising a plurality of permanent magnets, a plurality of the permanent magnets being mounted to a plurality of the curved slots.
5. The motor rotor with magnetic barrier according to claim 4, wherein the permanent magnet has a thickness T in a d-axis direction of the motor rotor with magnetic barrier, the magnetic barrier hole has a first side and a second side disposed opposite to each other, the second side is located on a side of the first side away from a center of the rotor core, and a distance from the first side to the second side is a thickness H of the magnetic barrier hole, satisfying T > H.
6. The motor rotor with magnetic barrier according to claim 4, wherein a thickness of a middle portion of the permanent magnet is greater than a thickness of both ends of the permanent magnet in a section perpendicular to an axial direction of the motor rotor with magnetic barrier.
7. The motor rotor with magnetic barrier of claim 4, wherein there is a gap between both ends of the permanent magnet and both ends of the curved slot in which the permanent magnet is embedded, the gap being filled with a non-magnetically conductive medium.
8. The motor rotor with magnetic barrier of claim 1, wherein the curved slots are arranged in a U-shape.
9. The motor rotor with magnetic barrier of claim 1, wherein the curved slots are arranged in a V-shape.
10. The motor rotor with magnetic barrier of claim 1, wherein the curved slots are arranged in an arc shape.
11. An electric machine comprising a motor rotor with a magnetic barrier according to any one of claims 1 to 10, and a stator sleeved outside the motor rotor with the magnetic barrier, the stator comprising a stator core and windings wound on stator teeth.
12. The motor of claim 11, wherein a thickness of the motor rotor having the magnetic barrier in an axial direction thereof is not less than a thickness of the stator in an axial direction thereof.
13. A compressor, characterized in that it comprises a compressor according to claim 11The motor 。
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270424.0A CN116191726A (en) | 2022-10-14 | 2022-10-14 | Motor rotor with magnetic barrier, motor and compressor |
| PCT/CN2023/113067 WO2024078117A1 (en) | 2022-10-14 | 2023-08-15 | Motor rotor having flux barriers, motor and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270424.0A CN116191726A (en) | 2022-10-14 | 2022-10-14 | Motor rotor with magnetic barrier, motor and compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116191726A true CN116191726A (en) | 2023-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211270424.0A Pending CN116191726A (en) | 2022-10-14 | 2022-10-14 | Motor rotor with magnetic barrier, motor and compressor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116191726A (en) |
| WO (1) | WO2024078117A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078131A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Rotor having magnetic barriers, motor and compressor |
| WO2024078117A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Motor rotor having flux barriers, motor and compressor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020213081A1 (en) * | 2019-04-17 | 2020-10-22 | 三菱電機株式会社 | Rotor, motor, compressor, and air conditioner |
| CN112821608B (en) * | 2021-01-22 | 2022-03-25 | 珠海格力电器股份有限公司 | Rotor punching sheet, rotor core, motor rotor, assembling method and motor |
| CN112968541A (en) * | 2021-01-26 | 2021-06-15 | 珠海格力电器股份有限公司 | Rotor assembly and self-starting permanent magnet synchronous reluctance motor |
| CN113162274A (en) * | 2021-05-10 | 2021-07-23 | 美的威灵电机技术（上海）有限公司 | Rotor structure, motor structure and compressor |
| CN115001178A (en) * | 2022-06-17 | 2022-09-02 | 珠海格力电器股份有限公司 | Motor rotor, motor and electric automobile |
| CN218387000U (en) * | 2022-10-14 | 2023-01-24 | 广东美芝制冷设备有限公司 | Motor rotor with magnetic barrier, motor and compressor |
| CN116191726A (en) * | 2022-10-14 | 2023-05-30 | 广东美芝制冷设备有限公司 | Motor rotor with magnetic barrier, motor and compressor |
-
2022
- 2022-10-14 CN CN202211270424.0A patent/CN116191726A/en active Pending
-
2023
- 2023-08-15 WO PCT/CN2023/113067 patent/WO2024078117A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078131A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Rotor having magnetic barriers, motor and compressor |
| WO2024078117A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Motor rotor having flux barriers, motor and compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024078117A1 (en) | 2024-04-18 |
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