CN116191725A - Permanent magnet auxiliary synchronous reluctance motor and compressor - Google Patents
Permanent magnet auxiliary synchronous reluctance motor and compressor Download PDFInfo
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- CN116191725A CN116191725A CN202211270422.1A CN202211270422A CN116191725A CN 116191725 A CN116191725 A CN 116191725A CN 202211270422 A CN202211270422 A CN 202211270422A CN 116191725 A CN116191725 A CN 116191725A
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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
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- Y02T10/64—Electric machine technologies in electromobility
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
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Abstract
The invention discloses a permanent magnet auxiliary synchronous reluctance motor and a compressor, wherein the permanent magnet auxiliary synchronous reluctance motor comprises a rotor and a stator, and the rotor comprises a rotor iron core, a plurality of curved slots, a plurality of permanent magnets and a plurality of magnetic barrier groups; a first cross magnetic conduction channel is formed between one layer of magnetic barrier hole close to the curved groove and the curved groove, and the width of one end of the first cross magnetic conduction channel is different from that of the other end of the first cross magnetic conduction channel. The permanent magnet auxiliary synchronous reluctance motor can improve the magnetic circuit in the magnetic conduction channel of the quadrature axis, so that the magnetic field distribution is more uniform, the iron loss of the motor is reduced, the performance of the motor is improved, the electromagnetic force density of the motor is reduced, and the torque pulsation of the motor is reduced.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a permanent magnet auxiliary synchronous reluctance motor and a compressor.
Background
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.
The permanent magnet auxiliary synchronous reluctance motor is used as a combination of the permanent magnet synchronous motor and the synchronous reluctance motor, the reluctance torque of the synchronous reluctance motor is utilized to the maximum extent, the permanent magnet torque is adopted for assistance, the advantages of the two motors are combined, and the efficiency and the power factor of the permanent magnet auxiliary synchronous reluctance motor are high, so that the permanent magnet auxiliary synchronous reluctance motor is more and more emphasized.
In the prior art, when a motor rotor rotates, the front side of a cross-axis magnetic conduction channel formed between a curved slot for mounting a permanent magnet and a layer of magnetic barrier hole close to the curved slot, namely the front side in the same direction as the rotation direction of the motor rotor, is large in electromagnetic force, easy to saturate, and the performance of the motor can be reduced due to the fact that the supersaturation, and meanwhile, the torque pulsation of the motor is larger, so that the noise of the motor is larger.
Disclosure of Invention
The invention mainly aims to provide a permanent magnet auxiliary synchronous reluctance motor, which aims to improve a magnetic circuit in a magnetic conduction channel of a quadrature axis and improve the performance of the motor.
In order to achieve the above purpose, the permanent magnet auxiliary synchronous reluctance motor provided by the invention comprises a rotor and a stator sleeved on the outer side of the rotor, wherein the stator comprises a stator iron core and windings wound on stator teeth, and the rotor comprises a rotor iron core, a plurality of curved slots, a plurality of permanent magnets 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 plurality of permanent magnets are arranged in the plurality of curved slots; 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 rotor, 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; a first cross magnetic conduction channel is formed between one layer of the magnetic barrier hole close to the curved slot and the curved slot, the first cross magnetic conduction channel is provided with a first end and a second end which are oppositely arranged, and the width of the first end is not larger than that of the second end; the rotating direction of the rotor core is a first direction, the direction from the first end to the second end is a second direction, and the first direction is opposite to the second direction.
In an embodiment, the curved slot group includes a first curved slot and a second curved slot, the first curved slot is located between the second curved slot and a center of a circle of the rotor core, and a cross-sectional area of the first curved slot is larger than a cross-sectional area of the second curved slot on a cross-section perpendicular to the axial direction of the rotor.
In an embodiment, the thickness of the intermediate 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 rotor.
In one embodiment, a gap is formed between two ends of the permanent magnet and two ends of the curved slot into which the permanent magnet is embedded.
In one embodiment, the void is filled with a non-magnetically permeable medium.
In an embodiment, the thickness of the rotor in the axial direction thereof is not smaller than the thickness of the stator in the axial direction thereof.
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 compressor comprising the permanent magnet auxiliary synchronous reluctance motor. The permanent magnet auxiliary synchronous reluctance motor comprises a rotor and a stator sleeved on the outer side of the rotor, wherein the stator comprises a stator iron core and windings wound on stator teeth, and the rotor comprises a rotor iron core, a plurality of curved slots, a plurality of permanent magnets 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 plurality of permanent magnets are arranged in the plurality of curved slots; 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 rotor, 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; a first cross magnetic conduction channel is formed between one layer of the magnetic barrier hole close to the curved slot and the curved slot, the first cross magnetic conduction channel is provided with a first end and a second end which are oppositely arranged, and the width of the first end is not larger than that of the second end; the rotating direction of the rotor core is a first direction, the direction from the first end to the second end is a second direction, and the first direction is opposite to the second direction.
The permanent magnet auxiliary synchronous reluctance motor comprises a rotor and a stator sleeved outside the rotor, wherein the stator comprises a stator iron core and windings wound on stator teeth, and the rotor comprises a rotor iron core, a plurality of curved slots, a plurality of permanent magnets 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 plurality of permanent magnets are arranged in the plurality of curved slots; 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 rotor, 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; a first cross magnetic conduction channel is formed between one layer of the magnetic barrier hole close to the curved slot and the curved slot, the first cross magnetic conduction channel is provided with a first end and a second end which are oppositely arranged, and the width of the first end is not larger than that of the second end; the rotating direction of the rotor core is a first direction, the direction from the first end to the second end is a second direction, and the first direction is opposite to the second direction. By the arrangement, the magnetic circuit in the first cross magnetic conduction channel can be improved, so that the magnetic field distribution is more uniform, the iron loss of the motor is reduced, the performance of the motor is improved, the electromagnetic force density of the motor is reduced, and the torque pulsation of the motor is reduced. 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 a rotor of a permanent magnet assisted synchronous reluctance motor according to an embodiment of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic diagram of a rotor of a permanent magnet assisted synchronous reluctance motor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another embodiment of a rotor of a permanent magnet assisted synchronous reluctance motor according to the present invention;
FIG. 5 is a diagram showing the main electromagnetic force comparison between the permanent magnet auxiliary synchronous reluctance motor and the common permanent magnet auxiliary synchronous reluctance motor;
fig. 6 is a torque ripple comparison diagram of the permanent magnet auxiliary synchronous reluctance motor of the present invention and a general permanent magnet auxiliary synchronous reluctance motor.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the |
| 10 | |
411 | |
| 100 | |
412 | |
| 200 | Curved |
510 | First quadrature |
| 300 | |
511 | |
| 400 | |
512 | |
| 410 | |
600 | Direct 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 permanent magnet auxiliary synchronous reluctance motor, which can be 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, the liquid crystal display device comprises a liquid crystal display device,
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 4, in an embodiment of the present invention, the permanent magnet auxiliary synchronous reluctance motor includes a rotor 10 and a stator sleeved outside the rotor 10, the stator includes a stator core and windings wound on stator teeth, the rotor 10 includes a rotor core 100, a plurality of curved slots 200, a plurality of permanent magnets 300 and a plurality of magnetic barrier groups 400; 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 permanent magnets 300 are disposed in the plurality of curved grooves 200; the plurality of magnetic barrier groups 400 are disposed on a side of the plurality of curved slots 200 away from the center of the rotor core 100, the magnetic barrier groups 400 include at least one layer of magnetic barrier holes 410 arranged at intervals along the direction of the d axis of the rotor 10, the number of the magnetic barrier holes 410 of one layer is plural, and the plurality of magnetic barrier holes 410 are arranged at intervals along the extending direction of the slot walls of the curved slots 200; a first cross magnetic channel 510 is formed between one layer of the magnetic barrier hole 410 near the curved slot 200 and the curved slot 200, the first cross magnetic channel 510 has a first end 511 and a second end 512 which are oppositely arranged, and the width of the first end 511 is not greater than the width of the second end 512; the rotation direction of the rotor core 100 is a first direction, and the direction from the first end 511 to the second end 512 is a second direction, and the first direction is opposite to the second direction.
Specifically, the rotor core 100 and the stator core are laminated from silicon steel plates and have a certain lamination height. The rotor core 100 is driven by the magnetic force of the permanent magnet 300, and the motor rotor 10 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 400 is formed between the curved slots 200 and the edge of the rotor core 100, and a plurality of magnetic barrier groups 400 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 300, and the permanent magnets 300 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 300 is placed in each curved slot 200, the polarities of the permanent magnets 300 in any two adjacent curved slots 200 are opposite, and a plurality of permanent magnets 300 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 10 with a double-layer structure in the prior art, the permanent magnets 300 are placed in the curved slots 200 with a single-layer structure, so that the thickness of the permanent magnets 300 can be increased within a limited volume, thereby improving the anti-demagnetization capability of the permanent magnets 300 and improving the reliability of the motor; meanwhile, the production efficiency of the motor rotor 10 with the single-layer curved groove 200 structure is higher; meanwhile, the amount of the permanent magnets 300 required to be placed in the curved slots 200 with the single-layer structure is relatively reduced, and the overall use amount of the permanent magnets 300 is reduced, so that the production cost of the rotor 10 can be further reduced, and the production cost of the motor is further reduced.
The magnetic barrier set 400 includes at least one layer of magnetic barrier holes 410 arranged at intervals along the d-axis direction of the rotor 10, the number of the magnetic barrier holes 410 of one layer is plural, the magnetic barrier holes 410 are arranged at intervals along the extending direction of the slot wall of the curved slot 200, and the magnetic barrier holes 410 can be used for filling air or other non-magnetic conductive materials. The groove wall of the curved groove 200 may be an inner groove wall near the edge of the rotor core 100, or may be an outer groove wall near the center of the rotor core 100. The extending directions of the inner groove wall and the outer groove wall may be the same or different, and in this embodiment, the extending directions of the inner groove wall and the outer groove wall are substantially the same, so that the plurality of magnetic barrier holes 410 are arranged at intervals along the extending direction of the inner groove wall of the curved groove 200 or along the extending direction of the outer groove wall of the curved groove 200. A straight-axis magnetic conduction channel 600 is formed between two adjacent magnetic barrier holes 410, the magnetic resistance of the direction of d axis of the straight-axis magnetic conduction channel 600 is small, the magnetic flux is high, and the inductance Ld is large; and the q-axis direction at the center line of the magnetic barrier hole 410 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 holes 410 are formed between the inner groove wall of the curved groove 200 and the edge of the rotor core 100, so that the magnetic force line path can be standardized on the basis of reducing the influence on the magnetic force of the permanent magnet, the magnetic field harmonic wave in the air gap is weakened, the magnetic saturation degree can be relieved, the magnetic barrier is formed in the rotating process of the motor rotor 10, 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, and 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.
A plurality of permanent magnets 300 are installed in a plurality of curved grooves 200, the number of permanent magnets 300 is set to be not less than the number of curved grooves 200 in order to secure the performance of the motor rotor 10, and at least one permanent magnet 300 should be placed in each curved groove 200. The shape of the permanent magnet 300 is adapted to the shape of the curved groove 200, and at least two opposite sides of the permanent magnet 300 are abutted against the inner wall surface of the curved groove 200, so as to ensure the stability of the permanent magnet 300 after being mounted in the curved groove 200. In terms of selecting the material of the permanent magnet 300, in order to increase the permanent magnet torque of the motor as much as possible, it is generally desirable to select a relatively high-performance permanent magnet 300, and the permanent magnet 300 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 300 is, the better, and as the residual magnetic flux density of the permanent magnet 300 is increased, the motor rotor 10 is saturated, resulting in a decrease in inductance. Wherein the saturation of the rotor 10 magnetic circuit has a greater influence on the q-axis inductance. In addition, it was found through research that an appropriate amount of residual magnetic flux density of the permanent magnet 300 may cause a certain saturation of the gap between both ends of the permanent magnet 300 and both ends of the curved groove 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 300 on the difference value of d-axis inductance and q-axis inductance is very necessary.
Referring to fig. 1 to 6, a first cross magnetic path 510 is formed between one layer of the magnetic barrier hole 410 near the crank slot 200 and the crank slot 200, the first cross magnetic path 510 has a first end 511 and a second end 512 disposed opposite to each other, the rotation direction of the rotor core 100, i.e. the rotor 10, is defined as a first direction, when the rotor 10 rotates, the front side of the first cross magnetic path 510, i.e. the second end 512 of the first cross magnetic path 510, is easily saturated, the performance of the motor is reduced due to the excessive saturation, and the torque ripple is also larger, so that the noise of the motor is larger, and therefore, the width of the first end 511 of the first cross magnetic path 510 is set to be not greater than the width of the second end 512. Regarding the determination of the positions of the first end 511 and the second end 512 of the first cross magnetic path 510, the direction from the first end 511 to the second end 512 is defined as a second direction, and the rotation direction of the rotor core 100 is defined as a first direction, and it is necessary to ensure that the first direction is opposite to the second direction. It should be noted that, the first direction is a rotation direction of the rotor core 100 of the rotor 10 of the motor during operation, and the second direction is a winding direction of the first magnetic conductive path 510, and if the first direction is a clockwise direction, the second direction is a counterclockwise direction, and vice versa. By the arrangement, the magnetic circuit in the first quadrature axis magnetic conduction channel 510 can be improved, so that the magnetic field distribution is more uniform, the iron loss of the motor is reduced, the performance of the motor is improved, the electromagnetic force density of the motor is reduced, and the torque pulsation of the motor is reduced.
The permanent magnet auxiliary synchronous reluctance motor comprises a rotor 10 and a stator sleeved outside the rotor 10, wherein the stator comprises a stator iron core and windings wound on stator teeth, and the rotor 10 comprises a rotor iron core 100, a plurality of curved slots 200, a plurality of permanent magnets 300 and a plurality of magnetic barrier groups 400; 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 permanent magnets 300 are disposed in the plurality of curved slots 200; the plurality of magnetic barrier groups 400 are disposed on a side of the plurality of curved slots 200 away from the center of the rotor core 100, the magnetic barrier groups 400 include at least one layer of magnetic barrier holes 410 arranged at intervals along the direction of the d axis of the rotor 10, the number of the magnetic barrier holes 410 of one layer is plural, and the plurality of magnetic barrier holes 410 are arranged at intervals along the extending direction of the slot walls of the curved slots 200; a first cross magnetic channel 510 is formed between one layer of the magnetic barrier hole 410 near the curved slot 200 and the curved slot 200, the first cross magnetic channel 510 has a first end 511 and a second end 512 which are oppositely arranged, and the width of the first end 511 is not greater than the width of the second end 512; the rotation direction of the rotor core 100 is a first direction, and the direction from the first end 511 to the second end 512 is a second direction, and the first direction is opposite to the second direction. By the arrangement, the magnetic circuit in the first quadrature axis magnetic conduction channel 510 can be improved, so that the magnetic field distribution is more uniform, the iron loss of the motor is reduced, the performance of the motor is improved, the electromagnetic force density of the motor is reduced, and the torque pulsation of the motor is reduced. Meanwhile, the amount of the permanent magnets 300 placed in the curved slots 200 of the single-layer structure may be reduced as compared to the amount of the permanent magnets 300 of the double-layer structure, so that the production cost of the motor rotor 10 may be reduced. Meanwhile, the motor rotor 10 of the single-layer curved groove 200 structure is also higher in production efficiency than the motor rotor 10 of the double-layer curved groove 200 structure, which is the motor rotor 10 of the single-layer curved groove 200 structure.
In one embodiment, a second cross-axis magnetic conductive channel (not shown) is formed between any two adjacent layers of the magnetic barrier holes 410, and the second cross-axis magnetic conductive channel has a third end and a fourth end that are disposed opposite to each other, the third end is disposed on the same side as the first end 511, and the fourth end is disposed on the same side as the second end 512; the width of the third end is not greater than the width of the fourth end.
Specifically, when the multi-layer magnetic barrier holes 410 are provided in the d-axis direction of the rotor 10, a second cross magnetic path is formed between any two adjacent layers of the magnetic barrier holes 410, and similarly, the second cross magnetic path has a third end and a fourth end which are disposed opposite to each other, the positions of the third end and the fourth end are determined by the relative positions of the first end 511 and the second end 512, and the positions of the first end 511 and the second end 512 are determined as described above. The width of the third end is not larger than that of the fourth end, so that the magnetic circuit in the second cross magnetic conduction channel can be improved, the magnetic field distribution is further more uniform, the iron loss of the motor is reduced, the performance of the motor is improved, the electromagnetic force density of the motor is reduced, and the torque pulsation of the motor is reduced.
Referring to fig. 1 to 4, further, the widths of the first end 511 to the second end 512 are gradually increased, and/or the widths of the third end to the fourth end are gradually increased. So set up, can make the width of first end 511 to second end 512 of first quadrature magnetic conduction passageway 510 be the gradual expansion setting, can further make magnetic field distribution more even, avoid leading to magnetic field distribution inhomogeneous because of the width part of first end 511 to second end 512 of first quadrature magnetic conduction passageway 510 is big less, equally, the width of third end to fourth end of second quadrature magnetic conduction passageway is the gradual expansion setting, also can further make magnetic field distribution more even, avoid leading to magnetic field distribution inhomogeneous because of the width part of third end to fourth end of second quadrature magnetic conduction passageway is big less. Therefore, the iron loss of the motor can be reduced, the performance of the motor is improved, the electromagnetic force density of the motor is reduced, and the torque pulsation of the motor is reduced.
Referring to fig. 2, in one embodiment, a straight-axis magnetic conductive channel 600 is formed between any two adjacent magnetic barrier holes 410 in one layer of the magnetic barrier holes 410. Specifically, the direct-axis magnetic conduction channel 600 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 410 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. 3, in an embodiment, the permanent magnet 300 has a thickness T in the direction of the d axis of the rotor 10, the magnetic barrier hole 410 has a first side 411 and a second side 412 disposed opposite to each other, the second side 412 is located on a side of the first side 411 away from the center of the rotor core 100, and a distance from the first side 411 to the second side 412 is the thickness H of the magnetic barrier hole 410, so that T > H is satisfied.
Specifically, the greater the thickness of the permanent magnet 300 in the direction of the d axis of the rotor 10d, the higher the permanent magnet torque of the motor, thereby improving the output torque of the motor and improving the efficiency of the motor. Meanwhile, in order to ensure that the magnetic circuit in the quadrature magnetic path is not blocked, the thickness of any one of the magnetic barrier holes 410 should not be too large, so that the thickness of the permanent magnet 300 is set to be larger than the thickness of any one of the magnetic barrier holes 410 of the plurality of layers of magnetic barrier holes 410. The thickness of the magnetic barrier hole 410 refers to the distance from the first side 411 to the second side 412 of the magnetic barrier hole 410, and if the first side 411 and the second side 412 are arranged in parallel, the thickness of the magnetic barrier hole 410 refers to the shortest distance from the first side 411 to the second side 412; if the first side 411 and the second side 412 are not parallel, the thickness of the magnetic barrier hole 410 refers to the distance from the first side 411 to the second side 412 of the magnetic barrier hole 410 near the middle part thereof; if the magnetic barrier hole 410 is irregularly designed, the thickness of the magnetic barrier hole 410 may be an average value between the maximum distance and the minimum distance from the first side 411 to the second side 412.
Referring to fig. 2, in an embodiment, the first side 411 and/or the second side 412 are linear; alternatively, the first side 411 and/or the second side 412 may be curved. Specifically, a plurality of the magnetic barrier holes 410 are arranged at intervals along the circumferential direction of the rotor core 100, and each magnetic barrier hole 410 has a first side 411 and a second side 412 opposite to each other. When the magnetic barrier hole 410 is provided, the first side 411 and the second side 412 may be linear, one of the first side 411 and the second side 412 may be linear, the other may be other, the first side 411 and the second side 412 may be arc-shaped, or one of the first side 411 and the second side 412 may be arc-shaped, and the other may be other, which is not limited in particular. The flux-barrier hole 410 further includes two other sides connecting both ends of the first side 411 and the second side 412, and the two other sides have an arc-shaped profile at the connection with both ends of the first side 411 and the second side 412 to facilitate the passage of the magnetic circuit.
In an embodiment, the thickness of the middle portion of the permanent magnet 300 is greater than the thickness of both ends of the permanent magnet 300 in a section perpendicular to the axial direction of the rotor 10. Specifically, the permanent magnet 300 may be configured to have a thick middle and thin ends, such that the thickness of the middle portion of the permanent magnet 300 is greater than the thickness of the ends thereof. Taking the arc-shaped permanent magnet 300 as an example, the arc-shaped permanent magnet 300 is easy to generate local demagnetization in the middle inner surface area of the permanent magnet 300, and the arc-shaped permanent magnet 300 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 300 can be relieved. In addition, the permanent magnet 300 with different thickness can prevent the permanent magnet 300 from sliding in the curved slot 200, and the stability of the permanent magnet 300 in the curved slot 200 is improved. Further, a layer of the magnetic barrier hole 410 near the curved slot 200 forms a magnetic path with the curved slot 200, and if the permanent magnet 300 adopts a structure with a thick middle and thin two ends, the width of the magnetic path will be 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.
In an embodiment, a gap is formed between two ends of the permanent magnet 300 and two ends of the curved slot 200 in which the permanent magnet 300 is embedded, so that the situation that the d-axis armature magnetic potential acts on the end of the permanent magnet 300 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 300 is easy to demagnetize and unsaturated in magnetizing are avoided, and meanwhile, the demagnetizing resistance 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 300 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 300 is placed is made larger, thereby improving the permanent magnet torque of the motor and improving the output capacity of the motor.
Referring to fig. 4, 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 300 is rectangular and blocky, because the arc-shaped permanent magnet 300 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 300 are relatively simple, so that the production efficiency can be improved by adopting the rectangular permanent magnet 300, and the universality is strong. The permanent magnet 300 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 300 is disposed in a rectangular block shape. The permanent magnet 300 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 300 may be provided in an arc shape, the shape of the permanent magnet 300 is adapted to the shape of the curved groove 200, and the permanent magnet 300 is adapted to be installed in the curved groove 200.
The invention also provides a compressor comprising the permanent magnet auxiliary synchronous reluctance motor. The specific structure of the permanent magnet auxiliary synchronous reluctance motor refers to the above embodiments, and because the compressor adopts all the technical solutions of all the embodiments, the compressor has at least all the beneficial effects brought by the technical solutions of the embodiments, and will not be 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 (14)
1. The utility model provides a synchronous reluctance motor is assisted to permanent magnetism, includes the rotor and overlaps and establish the stator in the rotor outside, the stator includes stator core and winding on stator tooth, its characterized in that, the rotor includes:
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;
the permanent magnets are arranged in the curved grooves; and
the magnetic barrier groups are arranged on one side, far away from the circle center of the rotor core, of the plurality of curved slots, 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 rotor, the number of one layer of magnetic barrier holes is multiple, and the plurality of magnetic barrier holes are arranged at intervals along the extending direction of the slot walls of the curved slots; a first cross magnetic conduction channel is formed between one layer of the magnetic barrier hole close to the curved slot and the curved slot, the first cross magnetic conduction channel is provided with a first end and a second end which are oppositely arranged, and the width of the first end is not larger than that of the second end;
the rotating direction of the rotor core is a first direction, the direction from the first end to the second end is a second direction, and the first direction is opposite to the second direction.
2. The permanent magnet-assisted synchronous reluctance motor of claim 1 wherein a second cross magnetic path is formed between any two adjacent layers of the magnetic barrier holes, the second cross magnetic path having a third end and a fourth end which are oppositely disposed, the third end being disposed on the same side as the first end, the fourth end being disposed on the same side as the second end; the width of the third end is not greater than the width of the fourth end.
3. The permanent magnet assisted synchronous reluctance machine of claim 2 wherein the width from the first end to the second end is progressively increased and/or the width from the third end to the fourth end is progressively increased.
4. The permanent magnet-assisted synchronous reluctance machine of claim 1 wherein a direct axis magnetic path is formed between any adjacent two of the barrier holes in one layer.
5. The permanent magnet motor of claim 1 wherein the permanent magnet has a thickness T in the direction of the d-axis of the rotor, the 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 the center of the rotor core, and a distance from the first side to the second side is the thickness H of the barrier hole, satisfying T > H.
6. The permanent magnet machine of claim 5 wherein the first side and/or the second side is rectilinear;
or, the first side edge and/or the second side edge are arc-shaped.
7. The permanent magnet machine of claim 1 wherein the thickness of the middle portion of the permanent magnet is greater than the thickness of the two ends of the permanent magnet in a section perpendicular to the axial direction of the rotor.
8. The permanent magnet machine of claim 1 wherein there is a gap between the ends of the permanent magnet and the ends of the curved slot in which it is embedded.
9. The permanent magnet machine of claim 8 wherein the void is filled with a non-magnetically permeable medium.
10. The permanent magnet machine of claim 1 wherein the thickness of the rotor in its axial direction is no less than the thickness of the stator in its axial direction.
11. The permanent magnet motor of claim 1 wherein the curved slot is U-shaped.
12. The permanent magnet motor of claim 1 wherein the curved slots are arranged in a V-shape.
13. The permanent magnet motor of claim 1 wherein the curved slot is arcuate.
14. A compressor comprising a permanent magnet assisted synchronous reluctance machine according to any one of claims 1 to 13.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270422.1A CN116191725A (en) | 2022-10-14 | 2022-10-14 | Permanent magnet auxiliary synchronous reluctance motor and compressor |
| PCT/CN2023/112881 WO2024078113A1 (en) | 2022-10-14 | 2023-08-14 | Permanent magnet-assisted synchronous reluctance motor and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270422.1A CN116191725A (en) | 2022-10-14 | 2022-10-14 | Permanent magnet auxiliary synchronous reluctance motor and compressor |
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| Publication Number | Publication Date |
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| CN116191725A true CN116191725A (en) | 2023-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211270422.1A Pending CN116191725A (en) | 2022-10-14 | 2022-10-14 | Permanent magnet auxiliary synchronous reluctance motor and compressor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116191725A (en) |
| WO (1) | WO2024078113A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078113A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Permanent magnet-assisted synchronous reluctance motor and compressor |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002031947A1 (en) * | 2000-10-12 | 2002-04-18 | Matsushita Electric Industrial Co., Ltd. | Electric motor |
| CN205566051U (en) * | 2015-12-29 | 2016-09-07 | 丹佛斯（天津）有限公司 | Electric motor |
| CN105914925B (en) * | 2016-05-18 | 2018-04-13 | 江苏仪能电机有限公司 | A kind of high torque density permanent-magnet magnetic resistance synchronous motor rotor structure |
| CN110957830A (en) * | 2019-12-09 | 2020-04-03 | 珠海格力电器股份有限公司 | Motor rotor, reluctance motor and electric automobile |
| CN216929718U (en) * | 2022-04-01 | 2022-07-08 | 合肥工业大学 | Ferrite auxiliary synchronous reluctance motor rotor structure |
| CN114844313A (en) * | 2022-06-10 | 2022-08-02 | 江苏大学 | Double-three-phase asymmetric alternating-pole permanent magnet auxiliary synchronous reluctance motor |
| CN218386999U (en) * | 2022-10-14 | 2023-01-24 | 广东美芝制冷设备有限公司 | Permanent magnet auxiliary synchronous reluctance motor and compressor |
| CN116191725A (en) * | 2022-10-14 | 2023-05-30 | 广东美芝制冷设备有限公司 | Permanent magnet auxiliary synchronous reluctance motor and compressor |
-
2022
- 2022-10-14 CN CN202211270422.1A patent/CN116191725A/en active Pending
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2023
- 2023-08-14 WO PCT/CN2023/112881 patent/WO2024078113A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024078113A1 (en) * | 2022-10-14 | 2024-04-18 | 广东美芝制冷设备有限公司 | Permanent magnet-assisted synchronous reluctance motor and compressor |
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| WO2024078113A1 (en) | 2024-04-18 |
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