CN116094214A - Rotor structure and motor - Google Patents

Rotor structure and motor Download PDF

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Publication number
CN116094214A
CN116094214A CN202310088318.9A CN202310088318A CN116094214A CN 116094214 A CN116094214 A CN 116094214A CN 202310088318 A CN202310088318 A CN 202310088318A CN 116094214 A CN116094214 A CN 116094214A
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CN
China
Prior art keywords
rotor
permanent magnet
shaft hole
rotor structure
rotor core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310088318.9A
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Chinese (zh)
Inventor
李霞
韩雪秋
张站立
史进飞
肖勇
李莹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202310088318.9A priority Critical patent/CN116094214A/en
Publication of CN116094214A publication Critical patent/CN116094214A/en
Pending legal-status Critical Current

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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
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The invention provides a rotor structure and a motor. The rotor structure comprises a rotor core (1), wherein the rotor core (1) comprises a shaft hole (4), the rotor core (1) is formed by laminating a plurality of rotor punching sheets (2), a magnetic steel groove (3) extending along the radial direction is formed in the rotor core (1) under one magnetic pole, a permanent magnet (5) is arranged in the magnetic steel groove (3), the permanent magnet (5) is magnetized along the direction perpendicular to the q axis, the magnetizing directions of two adjacent permanent magnets (5) are opposite, the faces of the permanent magnets (5) on two sides of the q axis are curved faces, and in the section perpendicular to the central axis of the rotor core (1), the curve change of the curved faces meets lambda sin 2 Alpha, wherein lambda is a given parameter, and alpha is the variation of the permanent magnet (5) from the shaft hole (4) to the outer circle of the rotor along the q-axis direction. According to the rotor structure, motor harmonic wave and harmonic loss can be reduced, torque pulsation is reduced, and motor efficiency is improved.

Description

Rotor structure and motor
Technical Field
The invention relates to the technical field of motors, in particular to a rotor structure and a motor.
Background
The tangential permanent magnet synchronous motor has the advantages of high operation efficiency, large output torque, good reliability and small mass and volume. The tangential permanent magnet synchronous motor combines the advantages of the built-in motor that permanent magnet torque and reluctance torque are generated simultaneously on the basis of the motor with the built-in rotor structure, the placement mode and the magnetizing direction of the magnetic steel are changed, the magnetic steel is magnetized along the tangential direction of a rotor core, the magnetizing directions of two adjacent magnetic steels are opposite, the magnetic fluxes of the two magnetic steels under one pole distance are connected in parallel, the magnetic flux density of the motor is improved, and the output torque of the motor is increased.
In the current tangential permanent magnet motor, a magnetic field generated by magnetic steel interacts with a tooth slot of an armature to generate tooth slot torque, so that the motor generates larger torque pulsation, and the efficiency of the motor is reduced.
Disclosure of Invention
The invention mainly aims to provide a rotor structure and a motor, which can reduce motor harmonic wave and harmonic loss, reduce torque pulsation and improve motor efficiency.
In order to achieve the above object, according to an aspect of the present invention, there is provided a rotor structure including a rotor core including a shaft hole, the rotor core being laminated by a plurality of rotor punching sheets, a magnetic steel groove extending in a radial direction being provided on the rotor core under one magnetic pole, a permanent magnet being provided in the magnetic steel groove, the permanent magnet being magnetized in a direction perpendicular to a q-axis, magnetizing directions of adjacent two permanent magnets being opposite, surfaces of the permanent magnet on both sides of the q-axis being curved surfaces, a curve change of the curved surfaces satisfying λsin in a section perpendicular to a central axis of the rotor core 2 Alpha, wherein lambda is a given parameter, and alpha is the variation of the permanent magnet from the shaft hole to the outer circle of the rotor along the q-axis direction.
Further, the radially outer side and the radially inner side of the permanent magnet are planar.
Further, the number n of permanent magnets is an even number, and the rotor core has n/2 pairs of poles.
Further, the length of the permanent magnet in the q-axis direction is L, and the tangential plane width of the permanent magnet is b, b/l=0.2 to 0.3.
Further, the length of the permanent magnet along the q-axis direction is L, the radius of the outer circle of the rotor is R, the radius of the shaft hole is R, and L/(R-R) is less than or equal to 0.8.
Further, in the coordinate system with the center of the rotor core as the origin of coordinates, a new coordinate system is established with the coordinates (0, R-delta-L/2) as the new origin and the q-axis direction as the alpha-axis direction, wherein R is the radius of the rotor excircle, delta is the maximum value of the distance between the side of the permanent magnet close to the rotor excircle and the rotor core excircle, L is the length of the permanent magnet along the q-axis direction, and the curved surface is in accordance with lambda sin in the range (-L/2, L/2) 2 (pi/(2*L)) -b/2.
Further, the permanent magnet and the magnetic steel groove are completely fitted in the q-axis direction and are symmetrical with respect to the q-axis.
Further, the permanent magnet and the magnetic steel groove are attached to one side, far away from the shaft hole, in the q-axis direction, and a gap exists on one side, close to the shaft hole.
Further, when the length of the permanent magnet in the q-axis direction is L, the maximum width of the gap in the q-axis direction is m, and m/L is less than or equal to 0.2.
Further, in a cross section perpendicular to the central axis of the rotor core, the side edge of the magnetic steel groove near the shaft hole side is a straight line, a curve or a combination of the straight line and the curve, and the magnetic steel groove is symmetrical about the q axis.
Further, the minimum distance between one side of the magnetic steel groove close to the shaft hole and the hole wall of the shaft hole is d, the radius of the outer circle of the rotor is R, and the radius of the shaft hole is R/(R-R) =0.01-0.1.
Further, the magnetic steel groove is an open groove or a closed groove.
Further, the maximum distance between the curved surfaces of the permanent magnet on both sides of the q-axis and the tangential surface of the permanent magnet is lambda/2, wherein lambda is more than 0 and less than or equal to b.
Further, the minimum distance between one side of the magnetic steel groove close to the shaft hole and the hole wall of the shaft hole is d, and the radius of the shaft hole is r, wherein r/d=9.5-10.
Further, the permanent magnets are uniformly arranged at intervals in the circumferential direction with the center of the rotor core as the center, and the circumferential distance between the highest points of the thicknesses of two adjacent permanent magnets in the direction perpendicular to the q axis is L1, l1=2pi (r+r)/(3*n) to pi (r+r)/n.
According to another aspect of the present invention there is provided an electrical machine comprising a stator structure and a rotor structure as described above, the rotor structure forming an air gap therebetween.
By applying the technical scheme of the invention, the rotor structure comprises a rotor core, the rotor core comprises a shaft hole, the rotor core is formed by laminating a plurality of rotor punching sheets, a magnetic steel groove extending along the radial direction is formed on the rotor core under one magnetic pole, a permanent magnet is arranged in the magnetic steel groove, the permanent magnet is magnetized along the direction vertical to the q axis, the magnetizing directions of two adjacent permanent magnets are opposite, the faces of the permanent magnet at two sides of the q axis are curved faces, and the curve change of the curved faces meets lambda sin in the section vertical to the central axis of the rotor core 2 Alpha, wherein lambda is a given parameter, and alpha is the variation of the permanent magnet from the shaft hole to the outer circle of the rotor along the q-axis direction. The rotor structure enables the thickness of the permanent magnet in the circumferential tangential direction to change along with the corresponding position change on the q-axis, the pole arc coefficient of the rotor structure also changes along with the change, the magnetic circuit of the permanent magnet in the d-axis direction is changed, the sine of the air gap synthesized magnetic density is increased, the harmonic wave of the motor magnetic field is improved, the harmonic loss is reduced, the heating of the motor is relieved, the efficiency of the motor is improved, the pole arc coefficient is changed through changing the permanent magnet structure of the motor, the magnetic field output by the permanent magnet is changed, the interaction between the magnetic field and the tooth grooves of the armature is reduced, the cogging torque is restrained, the quality of the motor output torque is improved on the premise that the average torque output by the motor is ensured, the pulsation of the electromagnetic torque is weakened, and the motor efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows a schematic structural view of a rotor structure of an embodiment of the present invention;
fig. 2 shows a schematic structural view of a permanent magnet of a rotor structure of an embodiment of the present invention;
FIG. 3 shows a perspective view of a rotor structure of an embodiment of the present invention; and
fig. 4 shows a schematic structural view of a rotor structure of another embodiment of the present invention.
Wherein the above figures include the following reference numerals:
1. a rotor core; 2. rotor punching; 3. a magnetic steel groove; 4. a shaft hole; 5. permanent magnets.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 to 4, according to an embodiment of the present invention, a rotor structure includes a rotor core 1, the rotor core 1 includes a shaft hole 4, the rotor core 1 is formed by laminating a plurality of rotor punching sheets 2, a magnetic steel groove 3 extending along a radial direction is formed on the rotor core 1 under one magnetic pole, a permanent magnet 5 is arranged in the magnetic steel groove 3, the permanent magnets 5 magnetize along a direction perpendicular to a q axis, magnetizing directions of two adjacent permanent magnets 5 are opposite, surfaces of the permanent magnets 5 on two sides of the q axis are curved surfaces, and in a section perpendicular to a central axis of the rotor core 1, curve change of the curved surfaces satisfies λsin 2 Alpha, wherein lambda is a given parameter, and alpha is the variation of the permanent magnet 5 from the shaft hole 4 to the outer circle of the rotor along the q-axis direction.
The rotor structure enables the thickness of the permanent magnet 5 in the circumferential tangential direction to change along with the corresponding position change on the q-axis, the pole arc coefficient of the rotor structure also changes along with the change, the magnetic circuit of the permanent magnet 5 in the d-axis direction is changed, the sine of the air gap synthesized magnetic density is increased, the harmonic wave of the motor magnetic field is improved, the harmonic loss is reduced, the heating of the motor is relieved, the pole arc coefficient of the rotor structure is changed by changing the permanent magnet 5 structure of the motor, the magnetic field output by the permanent magnet 5 is changed, the mutual influence between the magnetic field and the tooth grooves of the armature is reduced, the cogging torque is restrained, the quality of the motor output torque is improved on the premise that the average torque output by the motor is ensured, the pulsation of the electromagnetic torque is weakened, and the motor efficiency is improved.
The permanent magnet 5 adopts a tangential magnetizing mode, and utilizes the magnetism gathering effect of the parallel output magnetic field of the adjacent magnetic steels to improve the torque density of the motor.
In this embodiment, by limiting the curved surface shapes on two sides of the q-axis of the permanent magnet 5 and enabling the thickness to meet the limitation of the curve formula, the structure of the permanent magnet 5 can be optimized, the structure on two sides of the q-axis of the permanent magnet 5 can form a curved surface structure, the magnetic field formed by the permanent magnet 5 can be adjusted, the air gap flux density is improved, the adjusted air gap flux density meets the sine requirement, and therefore the harmonic wave of the motor magnetic field can be effectively improved, cogging torque is suppressed, and electromagnetic torque pulsation is reduced.
λsin in the present embodiment 2 Alpha is only a curve shape shaped into curved surfaces on both sides of the q axis of the permanent magnet 5, so alpha is the variation of the permanent magnet along the q axis direction, and lambda is a set parameter for defining the protruding height of the curve. The combined action of lambda and alpha can accurately limit the curved surface shape of the permanent magnet 5, so that the structure designed by the permanent magnet 5 can accurately meet the design requirement.
In one embodiment, the radially outer side and the radially inner side of the permanent magnet 5 are planes, and the processing and manufacturing of the permanent magnet 5 can be performed based on the radially outer side and the radially inner side of the permanent magnet 5, so that the molding difficulty is reduced, and the molding efficiency and the manufacturing precision are improved.
In one embodiment, the number n of permanent magnets 5 is an even number, and the rotor core 1 has n/2 pairs of poles.
In one embodiment, the length of the permanent magnet 5 in the q-axis direction is L, and the tangential plane width of the permanent magnet 5 is b, b/l=0.2 to 0.3. The tangential plane width in this embodiment means the minimum width of the permanent magnet 5 in the direction perpendicular to the q-axis, that is, the width of the radially outer side face and the radially inner side face of the permanent magnet 5 in the q-axis direction.
By limiting the ratio range of b/L, the ratio of the length to the tangential width of the permanent magnet 5 can be reasonably limited, so that the permanent magnet 5 has proper length to width ratio, the permanent magnet 5 can be ensured to have enough width, enough structural strength can be provided, the permanent magnet 5 can be ensured to have enough length, enough magnetic field can be provided, and the torque requirement of the motor can be met.
In one embodiment, the length of the permanent magnet 5 along the q-axis direction is L, the radius of the outer circle of the rotor is R, the radius of the shaft hole 4 is R, L/(R-R) is less than or equal to 0.8, so that the duty ratio of the length of the permanent magnet 5 on the radial width of the rotor core 1 is limited, the two ends of the rotor structure in the radial direction of the permanent magnet 5 can be left with enough size, the mechanical strength of the rotor structure is ensured, and the rotor structure is not deformed in the movement process.
In one embodiment, a new coordinate system is established in a coordinate system with the center of the rotor core 1 as the origin of coordinates and with the coordinates 0, R-delta-L/2 as the new origin and the q-axis direction as the alpha-axis direction, wherein R is the radius of the outer circle of the rotor, delta is the maximum value of the distance between the side of the permanent magnet 5 near the outer circle of the rotor core 1 and the outer circle of the rotor core 1, L is the length of the permanent magnet 5 along the q-axis direction, and the curved surface is in the range of-L/2, L/2 according to lambda sin 2 (pi/(2*L)) -b/2.
In this embodiment, by converting the coordinate system of the rotor core 1, a new coordinate system with the center of the permanent magnet 5 as the origin and the q-axis direction as the α -axis direction is formed, the curved surface variation trend on both sides of the q-axis of the permanent magnet 5 can be formed more accurately, and the limitation of the rotor structure is more satisfied. In this embodiment, the shape of the magnetic pole of the permanent magnet 5 in the axial direction is not changed, and the stability of the magnetic pole structure is ensured.
The structure of the permanent magnet 5 can be used as coordinates through the formula, the curved surface shapes of the two sides of the q axis of the permanent magnet 5 can be defined more accurately, the thickness change of the permanent magnet 5 can meet the definition of the curve formula, the structure of the permanent magnet 5 can be optimized, the structure of the two sides of the q axis of the permanent magnet 5 can form a curved surface structure, the magnetic field formed by the permanent magnet 5 can be adjusted, the air gap density is improved, the adjusted air gap density meets the sine requirement, therefore, the harmonic wave of the motor magnetic field can be effectively improved, the cogging torque is restrained, and the electromagnetic torque pulsation is weakened.
In one embodiment, the permanent magnet 5 and the magnetic steel groove 3 are completely fitted in the q-axis direction and are symmetrical about the q-axis.
In this embodiment, the shape of the permanent magnet 5 is adapted to the shape of the magnetic steel groove 3, so that the permanent magnet 5 can just fall into the magnetic steel groove 3 properly, the installation structure of the permanent magnet 5 can be limited by utilizing the structure of the magnetic steel groove 3, and since the permanent magnet 5 is completely attached to the wall surfaces of the two sides of the magnetic steel groove 3 in the circumferential direction, and the permanent magnet 5 is magnetized in the tangential direction, the problem that the passing efficiency of magnetic force lines is affected due to the existence of gaps between the permanent magnet 5 and the inner wall of the magnetic steel groove 3 can be effectively avoided, the magnetic force lines can more fully travel to the outer circle direction of the rotor through the rotor core 1 on the two sides of the circumferential direction of the permanent magnet 5, the utilization efficiency of the permanent magnet 5 is ensured, and the output torque of the motor is improved.
In one embodiment, the permanent magnet 5 and the magnetic steel groove 3 are attached on the side away from the shaft hole 4 in the q-axis direction, and a gap exists on the side close to the shaft hole 4.
In this embodiment, since the permanent magnet 5 is magnetized tangentially, a gap is formed between the side of the permanent magnet 5 close to the shaft hole 4 and the magnetic steel groove 3, and the magnetic force lines of the permanent magnet 5 are not affected to smoothly reach the rotor core 1, so that the magnetic field of the permanent magnet 5 is effectively ensured, and since a gap exists between the permanent magnet 5 and the inner wall of the magnetic steel groove 3 close to the shaft hole 4, the quality of the rotor structure can be reduced.
In one embodiment, the gaps are filled with non-magnetic conductive materials, the non-magnetic conductive materials are lighter in weight and have non-magnetic conductive characteristics, and magnetic resistance can be effectively increased, so that the trend of magnetic lines of force of the permanent magnet 5 is not affected, the quality of a rotor structure can be reduced, the stability of the installation structure of the permanent magnet 5 in the magnetic steel groove 3 can be improved, and the mechanical strength of the rotor structure can be improved.
In one embodiment, when the length of the permanent magnet 5 in the q-axis direction is L, the maximum width of the gap in the q-axis direction is m, and m/L is less than or equal to 0.2.
Through limiting the proportional relation between the length L of the permanent magnet 5 along the q-axis direction and the maximum width m of the gap along the q-axis direction, the air gap between the permanent magnet 5 and the magnetic steel groove 3 can be properly reduced, the magnetic saturation effect is utilized, the magnetic leakage is avoided near the rotating shaft, the non-magnetic conductive material is adopted for filling, the magnetic resistance is increased, the magnetic leakage is also reduced, and the position fixing of the permanent magnet 5 can be ensured.
In one embodiment, in a section perpendicular to the central axis of the rotor core 1, the side of the magnetic steel groove 3 on the side close to the shaft hole 4 is a straight line, a curved line, or a combination of a straight line and a curved line, and the magnetic steel groove 3 is symmetrical about the q-axis.
In one embodiment, the minimum distance between the side of the magnetic steel groove 3 close to the shaft hole 4 and the hole wall of the shaft hole 4 is d, the radius of the outer circle of the rotor is R, the radius of the shaft hole 4 is R, and d/(R-R) =0.01-0.1.
By defining the relationship between d and R, r, the ratio of the distance between the inner side wall of the magnetic steel groove 3 near the shaft hole 4 and the shaft hole 4 in the width of the rotor core 1 in the radial direction can be defined, so that the ratio of the distance between the magnetic steel groove 3 and the wall of the shaft hole 4 in the radial direction relative to the width of the rotor core 1 can be ensured to be no more than ten percent, and the decrease in mechanical strength of the motor under the condition of reducing magnetic leakage can be avoided.
In one embodiment, the magnetic steel groove 3 is an open groove, so that magnetic leakage can be avoided more effectively, the magnetic field utilization rate of the permanent magnet 5 is improved, and the output torque of the motor is improved.
In one embodiment, in order to improve the structural strength of the rotor core 1, the outer peripheral side of the rotor core 1 may be wrapped with a plastic insulating non-magnetic material, so that on one hand, the magnetic steel can be more effectively fixed, and on the other hand, the mechanical strength of the rotor structure can be effectively improved.
In one embodiment, the minimum distance between the tangential surface of the permanent magnet 5 on the side close to the rotor outer circumference and the rotor outer circumference is the distance between the tangential surface and the rotor outer circumference in the q-axis. The two tangential surfaces of the magnetic steel groove 3 are vertical to the q axis, and the processing of the two curved surfaces of the permanent magnet 5 positioned at the two sides of the q axis is kept with enough precision, so that the structure of the permanent magnet 5 in the axial direction is not changed. For the place where the magnetic steel groove 3 is connected with the inner diameter of the rotor core 1, the size design ensures that the inner diameter of the motor can be kept from magnetic leakage by utilizing the saturation of a magnetic circuit, and also ensures that the motor has enough mechanical strength when in operation, so that the rotor core 1 is not deformed.
In one embodiment, the magnetic steel groove 3 is a closed groove, a magnetism isolating bridge is formed between the rotor excircle of the rotor core 1 and the permanent magnet 5, and the magnetism isolating bridge is not broken, so that the circumference of the rotor core 1 is complete, the rotor excircle can be kept continuous, the processing difficulty is reduced, the mechanical strength of the rotor core 1 is enhanced, and the rotor core 1 is prevented from deforming in the moving process under the condition that the performance of the motor is kept not reduced.
In one embodiment, the maximum distance between the curved surface of the permanent magnet 5 on both sides of the q-axis and the tangential surface of the permanent magnet 5 is λ/2, where 0 < λ+.ltoreq.b.
The distance between the curved surfaces on two sides of the q-axis and the tangential plane of the permanent magnet is limited, so that the structural strength of the magnetic steel groove can be ensured, and the deformation does not occur in the running process of the motor.
In one embodiment, the minimum distance between the side of the magnetic steel groove 3 close to the shaft hole 4 and the hole wall of the shaft hole 4 is d, the radius of the shaft hole 4 is r, and r/d=9.5-10.
The distance between the magnetic steel groove and the shaft hole is limited, the value of d is ensured to be small enough, the trend of magnetic force lines can be limited by utilizing the magnetic saturation principle, the magnetic flux leakage on the shaft is reduced, the utilization rate of a magnetic field is improved, and the service life of the shaft is prolonged.
In one embodiment, the permanent magnets 5 are uniformly arranged at intervals in the circumferential direction with the center of the rotor core 1 as the center, and the circumferential distance between the highest points of the thicknesses of two adjacent permanent magnets 5 in the direction perpendicular to the q-axis is L1, l1=2pi (r+r)/(3*n) to pi (r+r)/n.
In this embodiment, by the above definition, the distance between the adjacent permanent magnets 5 and the distance between the adjacent magnetic steel grooves 3 can be ensured to be appropriate, the saturation of the magnetic circuit of the motor is reduced, and the output torque pulsation of the motor is weakened.
According to an embodiment of the invention, the motor comprises a stator structure and a rotor structure, wherein the rotor structure is the rotor structure, and an air gap is formed between the stator structure and the rotor structure.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (16)

1. The utility model provides a rotor structure, its characterized in that includes rotor core (1), rotor core (1) includes shaft hole (4), rotor core (1) are folded by a plurality of rotor punching (2) and are formed, under a magnetic pole, set up magnet steel groove (3) along radial direction extension on rotor core (1), be provided with permanent magnet (5) in magnet steel groove (3), permanent magnet (5) magnetize along the direction perpendicular to q axle, adjacent two the direction of magnetizing of permanent magnet (5) is opposite, the face of permanent magnet (5) in q axle both sides is the curved surface, in the cross-section of the central axis of perpendicular to rotor core (1), the curve change of curved surface satisfies λsin 2 Alpha, wherein lambda is a given parameter, and alpha is the variation of the permanent magnet (5) from the shaft hole (4) to the outer circle of the rotor along the q-axis direction.
2. A rotor structure according to claim 1, characterized in that the radially outer side and the radially inner side of the permanent magnets (5) are planar.
3. A rotor structure according to claim 1, characterized in that the number n of permanent magnets (5) is an even number, the rotor core (1) having n/2 pairs of poles.
4. A rotor structure according to claim 1, characterized in that the length of the permanent magnet (5) in the q-axis direction is L, the tangential face width of the permanent magnet (5) is b, b/L = 0.2-0.3.
5. The rotor structure according to claim 1, wherein the length of the permanent magnet (5) in the q-axis direction is L, the radius of the rotor outer circle is R, and the radius of the shaft hole (4) is R, L/(R-R) is less than or equal to 0.8.
6. The rotor structure according to claim 1, characterized in that a new coordinate system is established with a new origin of coordinates (0, R- δ -L/2) and a q-axis direction as an α -axis direction in a coordinate system with a center of the rotor core (1) as an origin of coordinates, wherein R is a radius of the rotor outer circle, δ is a maximum value of a distance between a side of the permanent magnet (5) near the rotor core (1) outer circle and the rotor core (1) outer circle, L is a length of the permanent magnet (5) in the q-axis direction, and the curved surface is in accordance with λsin in a range (-L/2, L/2) 2 (pi/(2*L)) -b/2.
7. The rotor structure according to any one of claims 1 to 6, characterized in that the permanent magnets (5) and the magnetic steel grooves (3) are fully fitted in the q-axis direction and are symmetrical about the q-axis.
8. The rotor structure according to any one of claims 1 to 6, characterized in that the permanent magnet (5) and the magnetic steel groove (3) are attached on a side away from the shaft hole (4) in the q-axis direction, and a gap is present on a side close to the shaft hole (4).
9. The rotor structure according to claim 8, wherein when the length of the permanent magnet (5) in the q-axis direction is L, the maximum width of the gap in the q-axis direction is m, m/L is 0.2 or less.
10. The rotor structure according to any one of claims 1 to 6, characterized in that, in a section perpendicular to the central axis of the rotor core (1), the side of the magnetic steel groove (3) on the side close to the shaft hole (4) is a straight line, a curved line or a combination of a straight line and a curved line, and the magnetic steel groove (3) is symmetrical about the q-axis.
11. The rotor structure according to any one of claims 1 to 6, characterized in that a minimum distance between a side of the magnetic steel groove (3) close to the shaft hole (4) and a wall of the shaft hole (4) is d, a radius of the rotor outer circle is R, and a radius of the shaft hole (4) is R, d/(R-R) =0.01 to 0.1.
12. The rotor structure according to any one of claims 1 to 6, characterized in that the magnetic steel groove (3) is an open groove or the magnetic steel groove (3) is a closed groove.
13. Rotor structure according to claim 6, characterized in that the maximum distance between the curved surface of the permanent magnet (5) on both sides of the q-axis and the tangential surface of the permanent magnet (5) is λ/2, where 0 < λ+.ltoreq.b.
14. The rotor structure according to any one of claims 1 to 4, 6, characterized in that the minimum distance between the side of the magnetic steel groove (3) close to the shaft hole (4) and the wall of the shaft hole (4) is d, the radius of the shaft hole (4) is r, r/d=9.5 to 10.
15. The rotor structure according to claim 1, characterized in that the permanent magnets (5) are uniformly arranged at intervals in the circumferential direction centering on the center of the rotor core (1), and the circumferential distance between the highest points of the thicknesses of two adjacent permanent magnets (5) in the direction perpendicular to the q-axis is L1, l1=2pi (r+r)/(3*n) to pi (r+r)/n.
16. An electric machine comprising a stator structure and a rotor structure, the rotor structure being the rotor structure of any one of claims 1 to 15, an air gap being formed between the stator structure and the rotor structure.
CN202310088318.9A 2023-02-08 2023-02-08 Rotor structure and motor Pending CN116094214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310088318.9A CN116094214A (en) 2023-02-08 2023-02-08 Rotor structure and motor

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