CN113783327A - Motor rotor, manufacturing method of motor rotor and permanent magnet auxiliary reluctance motor - Google Patents
Motor rotor, manufacturing method of motor rotor and permanent magnet auxiliary reluctance motor Download PDFInfo
- Publication number
- CN113783327A CN113783327A CN202110987656.7A CN202110987656A CN113783327A CN 113783327 A CN113783327 A CN 113783327A CN 202110987656 A CN202110987656 A CN 202110987656A CN 113783327 A CN113783327 A CN 113783327A
- Authority
- CN
- China
- Prior art keywords
- rotor
- magnetic
- motor
- powder metallurgy
- permanent magnet
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 238000004663 powder metallurgy Methods 0.000 claims abstract description 56
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 52
- 239000006247 magnetic powder Substances 0.000 claims abstract description 49
- 230000004888 barrier function Effects 0.000 claims abstract description 39
- 229910052742 iron Inorganic materials 0.000 claims abstract description 19
- 238000003825 pressing Methods 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 18
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 239000000945 filler Substances 0.000 claims description 4
- 238000002955 isolation Methods 0.000 abstract description 14
- 230000004907 flux Effects 0.000 abstract description 6
- 229910000976 Electrical steel Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000008111 motor development Effects 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/028—Means for mechanical adjustment of the excitation flux by modifying the magnetic circuit within the field or the armature, e.g. by using shunts, by adjusting the magnets position, by vectorial combination of field or armature sections
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a motor rotor, a manufacturing method of the motor rotor and a permanent magnet auxiliary reluctance motor, wherein the motor rotor comprises a rotor core, a magnetic conduction channel and permanent magnets, the magnetic conduction channels and the permanent magnets are alternately stacked, the structure of the motor rotor is optimized, a magnetic isolation bridge is omitted, the magnetic flux leakage and the iron loss of the motor rotor are reduced, and the problem that the rotor is heated due to local magnetic saturation at the magnetic isolation bridge is solved; the rotor core and the magnetic conduction channel are made of iron-based powder metallurgy and have the characteristics of high magnetic conductivity and low iron loss, and the magnetic conduction channel positioned on the outer peripheral side of the rotor core is provided with a concave structure, so that the salient pole ratio of the motor rotor is improved; the manufacturing method of the motor rotor comprises the steps of filling soft magnetic powder metallurgy materials into a rotor iron core position and a magnetic conduction channel position of a rotor die, filling hard magnetic powder metallurgy materials into a magnetic barrier groove, pressing and sintering, and magnetizing a permanent magnet to form the motor rotor; the manufacturing process is simplified, and the power factor and the power density of the motor are improved.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a motor rotor, a manufacturing method of the motor rotor and a permanent magnet auxiliary reluctance motor.
Background
The permanent magnet synchronous motor is one of the main directions of motor development, wherein the power density of the permanent magnet auxiliary reluctance motor is equivalent to that of the rare earth permanent magnet synchronous motor when the permanent magnet auxiliary reluctance motor does not use expensive rare earth permanent magnets, so that the permanent magnet auxiliary reluctance motor is widely applied. In the existing permanent magnet auxiliary reluctance motor, a motor rotor comprises a rotor core and a permanent magnet, wherein the rotor core is formed by overlapping silicon steel sheets, magnetic barrier grooves are punched on the silicon steel sheets, a magnetic conduction channel is formed between the magnetic barrier grooves, and the permanent magnet is arranged in the magnetic barrier grooves; a plurality of magnetic barrier grooves and magnetic conduction channels are formed in the rotor core, the magnetic conduction channels are connected through magnetic isolation bridges, the structure of the motor rotor is complex, the manufacturing process is complex, the magnetic leakage and the iron loss of the rotor are increased, and the performance and the efficiency of the motor are reduced.
Disclosure of Invention
In view of the above, the invention provides a motor rotor, a manufacturing method of the motor rotor and a permanent magnet auxiliary reluctance motor, so as to solve the problems of complex structure of the rotor, complex manufacturing process, large magnetic flux leakage and the like in the prior art.
The invention provides a motor rotor which is an integrated structure formed by pressing and sintering a permanent magnet and a soft magnetic powder metallurgy material by taking the soft magnetic powder metallurgy material as a filler and taking the permanent magnet as an insert.
Further optionally, the electric machine rotor comprises a magnetically permeable channel and a rotor core; the magnetic conduction channels comprise a plurality of magnetic conduction channels, the magnetic conduction channels are not in contact with the rotor core at intervals, and the magnetic conduction channels are not in contact at intervals; the permanent magnet comprises a plurality of permanent magnets; the plurality of permanent magnets are arranged between the rotor core and the magnetic conduction channel and/or between the magnetic conduction channels.
Further optionally, the rotor core and the magnetic conduction channel are both made of iron-based powder metallurgy, and the permanent magnet is made of hard magnetic powder metallurgy.
Further optionally, the cross section of the adjacent magnetic conduction channel is matched with the cross section of the permanent magnet; the permanent magnets and the magnetic conduction channels are stacked alternately along the radial direction of the rotor core to form a magnetic pole group.
Further optionally, a plurality of the magnetic pole groups are provided along a circumferential direction of the rotor core.
Further optionally, the magnetic conduction channel located on the outer peripheral side of the rotor core is formed with a concave structure.
Further optionally, the motor rotor further includes a shaft sleeve, a limiting structure is formed on an outer peripheral side of the shaft sleeve, correspondingly, a mounting hole is formed on the rotor core, and the shaft sleeve is embedded in the mounting hole and connected with the rotor core through the limiting structure;
and a connecting key is formed on the inner peripheral side of the shaft sleeve and is used for connecting with a motor spindle.
The invention also provides a manufacturing method of the motor rotor, the motor rotor further comprises a motor rotor die, and the motor rotor die is provided with a rotor iron core position, a magnetic conduction channel position and a magnetic barrier groove; the manufacturing method comprises the following steps:
filling soft magnetic powder metallurgy materials into the rotor iron core position and the magnetic conduction channel position, and inlaying magnetic barrier groove pieces into the magnetic barrier grooves;
pressing and sintering the soft magnetic powder metallurgy material to preliminarily form the soft magnetic powder metallurgy material;
the magnetic barrier groove piece is pulled out of the magnetic barrier groove, and hard magnetic powder metallurgy materials are filled into the magnetic barrier groove;
pressing and sintering the soft magnetic powder metallurgy material and the hard magnetic powder metallurgy material again, so that the soft magnetic powder metallurgy material is finally formed into the rotor core and the magnetic conduction channel, and the hard magnetic powder metallurgy material is formed into the permanent magnet;
and magnetizing the permanent magnet to form the motor rotor.
The invention also provides a manufacturing method of the motor rotor, the motor rotor further comprises a motor rotor die, and the motor rotor die is provided with a rotor iron core position, a magnetic conduction channel position and a magnetic barrier groove; the manufacturing method comprises the following steps:
placing the manufactured and magnetized permanent magnet as an insert in the magnetic barrier groove;
filling soft magnetic powder metallurgy materials into the rotor iron core position and the magnetic conduction channel position;
pressing and sintering the soft magnetic powder metallurgy material, and then forming the soft magnetic powder metallurgy material into the rotor core and the magnetic conduction channel;
the rotor core, the magnetic conduction channel and the permanent magnet form the motor rotor.
The invention also provides a permanent magnet auxiliary reluctance motor which comprises the motor rotor or a manufacturing method adopting the motor rotor.
The invention provides a motor rotor, which comprises a rotor core, a plurality of magnetic conduction channels and a plurality of permanent magnets, wherein the magnetic conduction channels are not contacted with the rotor core at intervals, the magnetic conduction channels are not contacted at intervals, and the magnetic conduction channels and the permanent magnets are alternately stacked along the radial direction of the rotor core, so that the structure of the motor rotor is optimized, a magnetic isolation bridge is cancelled, the magnetic leakage quantity and the iron loss quantity of the motor rotor are reduced, the performance and the efficiency of a motor are improved, and the problem that the rotor generates heat due to local magnetic saturation at the magnetic isolation bridge is solved; the rotor core, the magnetic conduction channel and the permanent magnet are pressed and sintered into a whole; the rotor core and the magnetic conduction channel are made of iron-based powder metallurgy, have the characteristics of high magnetic conductivity and low iron loss, and the magnetic conduction channel positioned on the outer peripheral side of the rotor core is provided with a concave structure, so that the salient pole ratio of the motor rotor is improved, and the torque output capacity of the motor is enhanced; the invention provides a manufacturing method of a motor rotor, which comprises the steps of filling soft magnetic materials into a rotor iron core position and a magnetic conduction channel position of a rotor die, inlaying magnetic barrier groove pieces into magnetic barrier grooves, pressing and sintering, drawing out the magnetic barrier groove pieces, filling hard magnetic powder metallurgy materials into the magnetic barrier grooves, pressing and sintering again, further forming a rotor iron core, a magnetic conduction channel and a permanent magnet, and magnetizing the permanent magnet to form the motor rotor; the manufacturing process of the motor rotor is simplified, the power factor and the power density of the motor are improved, and the reliability and the practicability of the motor operation are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1a is a schematic structural diagram of a rotor of an electric machine according to an embodiment of the present invention;
FIG. 1b is a cross-sectional view A-A of FIG. 1 a;
fig. 2a is a schematic structural diagram of a first permanent magnet according to an embodiment of the present invention;
FIG. 2b is a schematic structural diagram of a second permanent magnet according to an embodiment of the present invention;
FIGS. 3a and 3b are schematic structural views of embodiments of the bushing provided by the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of a motor provided in the present invention;
in the figure:
1-a rotor core; 11-mounting holes;
21-a magnetic conduction channel; 211-a first magnetically permeable channel; 212-a second magnetically permeable channel; 213-a concave structure; 22-a permanent magnet; 221-a first permanent magnet; 222-a second permanent magnet;
3-shaft sleeve; 31-a limiting structure; 32-shaft hole; 321-a connecting bond;
4-permanent magnet auxiliary reluctance motor; 41-motor stator.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
In the existing permanent magnet auxiliary reluctance motor, a plurality of magnetic barrier grooves and a plurality of magnetic conduction channels are required to be formed on a rotor core, so that the motor rotor has a complex structure, low strength and a complex manufacturing process; the magnetic conduction passageway is directly formed by rotor core, connects through separating the magnetic bridge between the magnetic conduction passageway, and the magnetic leakage volume and the iron loss volume of rotor increase, separate magnetic bridge department and generate heat easily, and the performance and the efficiency of motor reduce. The invention creatively provides a motor rotor, which is an integrated structure formed by pressing and sintering a permanent magnet and a soft magnetic powder metallurgy material by taking the soft magnetic powder metallurgy material as a filler and taking the permanent magnet as an insert; the magnetic barrier grooves on the rotor core are filled, so that the forming quality of the rotor core is improved, the structure of the motor rotor is simplified, and the structural strength of the rotor core is ensured; the magnetic isolation bridge in the prior art is removed, so that the motor rotor is of a structure without the magnetic isolation bridge, the magnetic leakage quantity and the iron loss quantity at the magnetic isolation bridge are reduced, the performance and the efficiency of the motor are improved, and the problem that the rotor generates heat due to local magnetic saturation at the magnetic isolation bridge is solved.
< rotor of electric machine >
As shown in fig. 1a, 1b, 2a and 2b, the present embodiment provides a rotor of an electric motor, which is an integrated structure formed by pressing and sintering a permanent magnet 22 and a soft magnetic powder metallurgy material, with the soft magnetic powder metallurgy material as a filler and the permanent magnet 22 as an insert; the motor rotor comprises a rotor iron core 1, a magnetic conduction channel 21 and a permanent magnet 22; the magnetic conduction channels 21 are multiple, the magnetic conduction channels 21 are not in contact with the rotor core 1 at intervals, and the magnetic conduction channels 21 are not in contact at intervals; the permanent magnets 22 are arranged between the rotor core 1 and the magnetic conduction channel 21 and/or between the magnetic conduction channels 21; the structure of the motor rotor is optimized, the forming quality of the rotor core 1 is improved, and the structural strength of the rotor core 1 is ensured; the magnetic isolation bridge on the rotor core 1 is eliminated, the magnetic leakage quantity and the iron loss quantity of the motor rotor are reduced, the electromagnetic performance and the efficiency of the motor are improved, and the problem that the rotor generates heat due to local magnetic saturation at the magnetic isolation bridge is solved.
In order to reduce the loss of the motor rotor, the rotor core 1 and the magnetic conduction channel 21 are both made of soft magnetic powder metallurgy materials with high magnetic permeability and low loss, and the permanent magnet 22 is made of hard magnetic powder metallurgy materials; the permanent magnet 22 is made of hard magnetic powder metallurgy material, and is characterized in that after an external magnetic field disappears, the surface residual magnetism Br of the permanent magnet 22 always exists, the size is related to the material proportion, and the direction is related to the direction of the previous magnetic field. Preferably, the rotor core 1 and the magnetic conduction channel 21 are made of iron-based powder metallurgy, such as Somaloy material and amorphous alloy, and have the advantages of high magnetic conduction and low loss (iron loss).
The characteristics of iron-based powder metallurgy of high magnetic permeability and low eddy current loss are utilized, the iron-based powder metallurgy is made into the magnetic conduction channel 21 and the rotor iron core 1 to replace a silicon steel sheet laminated iron core, the hard magnetic characteristic of the permanent magnet 22 is utilized as auxiliary magnetism, the characteristic of poor magnetic conductivity of the permanent magnet 22 is utilized, the permanent magnet 22 is used as a magnetic barrier to form a motor rotor without the silicon steel sheet, the power density and the torque density of the motor can be increased, the thickness size of the magnetic conduction channel 21 is not limited, the permanent magnet auxiliary reluctance motor with 2-3 layers of magnetic barriers can be designed, and the surface residual magnetism Br is almost equal to zero after an external magnetic field disappears; the magnetic conduction channel 21 does not generate high iron loss (mainly eddy current) due to the thickness dimension; the motor rotor does not contain silicon steel sheet materials, the structure and the process are simple, the assembly is convenient, and the electrical performance of the motor is improved; experiments and theories prove that the magnetic permeability of the magnetic circuit of the motor rotor is better than that of a silicon steel sheet laminated rotor, the iron loss is obviously lower than that of the silicon steel sheet laminated rotor, the manufacturing process of the motor rotor is greatly simplified, and the efficiency and the power factor of the motor are improved.
In order to reliably connect the adjacent magnetic conduction channels 21 and the permanent magnets 22, the cross sections of the adjacent magnetic conduction channels 21 are matched with the cross section of the permanent magnet 22; the plurality of permanent magnets 22 and the plurality of magnetic conduction channels 21 are alternately stacked in the radial direction of the rotor core 1 to form a magnetic pole group, and the plurality of magnetic pole groups are arranged in the circumferential direction of the rotor core 11; the cross section of the magnetic conduction channel 21 and the cross section of the permanent magnet 22 are both linear or arc; the magnetic conduction channel 21 is matched with the adjacent permanent magnet 22, so that the sine degree of the air gap flux density can be improved, the harmonic content of the electromagnetic force is reduced, and the harmonic loss is reduced. In this embodiment, the number of the magnetic conduction channels 21 and the number of the permanent magnets 22 are 12, and 2 magnetic conduction channels 21 and 2 permanent magnets 22 are a magnetic pole group, and total 6 magnetic pole groups.
Preferably, as shown in fig. 2a and 2b, the cross section of the magnetic conduction channel 21 and the cross section of the permanent magnet 22 are both arc-shaped, and correspondingly, the cross section of the installation position 11 is arc-shaped; specifically, the motor rotor includes a first permanent magnet 221, a first magnetic conduction channel 211, a second permanent magnet 222, and a second magnetic conduction channel 212 that are sequentially stacked from inside to outside along the radial direction of the rotor core 1, that is, the first permanent magnet 221 is disposed near the rotor core 1, and the second magnetic conduction channel 212 is disposed near the outer peripheral side of the rotor core 1; the first permanent magnet 221, the first magnetic conduction channel 211, the second permanent magnet 222 and the second magnetic conduction channel 212 are concentrically arranged; the width of the first permanent magnet 221 is greater than that of the second permanent magnet 222 along the radial direction of the rotor core 1, the width of the first magnetic conduction channel 211 is less than that of the second magnetic conduction channel 212, and the width of the first magnetic conduction channel 211 is less than that of the first permanent magnet 221 and the second permanent magnet 222; the first permanent magnet 221 and the second permanent magnet 222 are not in contact with each other; the first magnetic conduction channel 211 and the second magnetic conduction channel 212 form two magnetic conduction channels, the rotor core 1 forms a third magnetic conduction channel, the first magnetic conduction channel 211, the second magnetic conduction channel 212 and the third magnetic conduction channel are all not in contact at intervals, a magnetic isolation bridge is cancelled, the magnetic leakage quantity and the iron loss quantity at the magnetic isolation bridge are reduced, the performance of the motor is improved, the problem of rotor heating caused by local magnetic saturation at the magnetic isolation bridge is solved, the area occupation ratio of magnetic flux density saturation is reduced, the magnetic flux density saturation level of the magnetic conduction channels and the yoke part of the stator can also be reduced, the channels through which magnetic lines pass are smooth, and the output of motor torque is favorably improved; compared with the common permanent magnet synchronous motor, the permanent magnet synchronous motor has the advantages of increased magnetic conduction channels, high magnetic permeability, wide magnetic field distribution and more uniform density, reduces the pulsation of a motor rotor, and improves the running stability of the motor.
It should be noted that the first permanent magnet 221 and the second permanent magnet 222 may be made of the same material or different materials, for example, the first permanent magnet 221 is ferrite, and the second permanent magnet 222 is neodymium iron boron; the first permanent magnet 221 and the second permanent magnet 222 are both ferrite or rare earth permanent magnets.
In some embodiments, the magnetic conductive path located at the outer circumferential side of the rotor core 1 is formed with a concave structure 213; in this embodiment, the concave structure 213 is formed on the outer peripheral side of the second magnetic conduction channel 212 close to the rotor core 1, so that the magnetic path of the second magnetic conduction channel 212 is extended, the magnetic flux leakage at the second magnetic conduction channel 212 is reduced, the salient pole ratio is improved, and the power density and efficiency of the motor are further improved; the air gap of the q axis is increased, the q axis inductance is reduced, and the torque density and the output capacity of the motor are enhanced; the motor can ensure the efficiency of the motor by using partial reluctance torque under the condition of lower back electromotive force.
In other embodiments, as shown in fig. 3a and 3b, the motor rotor further includes a shaft sleeve 3, a limiting structure 31 is formed on an outer peripheral side of the shaft sleeve 3, correspondingly, the rotor core 1 is formed with a mounting hole 12, and the shaft sleeve 3 is embedded in the mounting hole 12 and connected with the rotor core 1 through the limiting structure 31; the reliability of the connection between the rotor core 1 and the motor spindle is improved; a shaft hole 32 is formed on the inner peripheral side of the shaft sleeve 3, and a connecting key 321 is formed in the shaft hole 32 and used for connecting with a motor spindle; the strength of the motor rotor is increased, and the risk of failure of the connection part of the motor rotor and the motor spindle can be reduced; preferably, limit structure 31 is the draw-in groove, is formed with the buckle in mounting hole 12 correspondingly, and the buckle realizes being connected of axle sleeve and rotor core 1 with the draw-in groove cooperation.
< production method >
The present embodiment further provides a method for manufacturing a motor rotor according to any one of the above embodiments, where the motor rotor further includes a motor rotor mold for manufacturing the motor rotor; the motor rotor mould is provided with a rotor iron core position, a magnetic conduction channel position and a magnetic barrier groove; the magnetic barrier groove is positioned between the rotor iron core position and the magnetic conduction channel position and/or between the magnetic conduction channel positions; the manufacturing method comprises the following steps:
s10, filling soft magnetic powder metallurgy materials into the rotor iron core position and the magnetic conduction channel position, and inlaying magnetic barrier groove pieces into the magnetic barrier grooves;
s11, pressing and sintering the soft magnetic powder metallurgy material to preliminarily form the soft magnetic powder metallurgy material;
s12, drawing out the magnetic barrier groove piece from the magnetic barrier groove, and filling hard magnetic powder metallurgy materials into the magnetic barrier groove;
s13, pressing and sintering the soft magnetic powder metallurgy material and the hard magnetic powder metallurgy material again, so that the soft magnetic powder metallurgy material is finally formed into the rotor core 1 and the magnetic conduction channel 21, and the hard magnetic powder metallurgy material is formed into the permanent magnet 22;
s14, magnetizing the permanent magnet 22 to form a motor rotor;
if the motor rotor of the large-torque motor is to be manufactured, the step of S10 is preceded by the steps of:
arranging the shaft sleeve 3 at a corresponding position of the motor rotor mould; the risk of breakage of stress concentration positions of the rotor core in the pressing and sintering processes can be reduced;
the manufacturing method of the motor rotor simplifies the manufacturing process, reduces the production cost of the motor and ensures the performance of the motor.
In other embodiments, there is also provided a method of manufacturing an electric machine rotor according to any one of the above aspects, further comprising an electric machine rotor mold, the electric machine rotor mold being formed with a rotor core location, a magnetic conduction channel location and a magnetic barrier slot; the magnetic barrier groove is positioned between the rotor core and the magnetic conduction channel position and/or between the magnetic conduction channel positions; the manufacturing method comprises the following steps:
s20, placing the manufactured permanent magnet 22 as an insert in a magnetic barrier groove;
s21, filling soft magnetic powder metallurgy materials into the rotor iron core position and the magnetic conduction channel position;
s22, pressing and sintering the soft magnetic powder metallurgy material, and then forming the soft magnetic powder metallurgy material into the rotor core 1 and the magnetic conduction channel 21;
s23, the rotor core 1, the magnetic conduction channel 21 and the permanent magnet 22 form a permanent magnet auxiliary reluctance motor rotor.
If the motor rotor of the large-torque motor is to be manufactured, the step of S20 is preceded by the steps of:
arranging the shaft sleeve 3 at a corresponding position of the motor rotor mould; the risk of breakage of stress concentration positions of the rotor core in the pressing and sintering processes can be reduced;
the manufacturing method of the motor rotor simplifies the manufacturing process, reduces the production cost of the motor and ensures the performance of the motor.
It should be noted that if the prefabricated permanent magnet 22 is already magnetized, it is not necessary to magnetize again; if the prefabricated permanent magnet 22 is not magnetized, it needs to be magnetized.
As shown in fig. 4, the present embodiment further provides a permanent magnet auxiliary reluctance motor 4, which includes a motor stator 41, the motor rotor described above, or a manufacturing method using the motor rotor described above.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. The motor rotor is characterized in that the motor rotor is of an integrated structure formed by pressing and sintering a permanent magnet and a soft magnetic powder metallurgy material by taking the soft magnetic powder metallurgy material as a filler and taking the permanent magnet as an insert.
2. The electric machine rotor of claim 1, wherein the electric machine rotor comprises a magnetically permeable channel and a rotor core; the magnetic conduction channels comprise a plurality of magnetic conduction channels, the magnetic conduction channels are not in contact with the rotor core at intervals, and the magnetic conduction channels are not in contact at intervals; the permanent magnet comprises a plurality of permanent magnets; the plurality of permanent magnets are arranged between the rotor core and the magnetic conduction channel and/or between the magnetic conduction channels.
3. The electric machine rotor of claim 2, wherein the rotor core and the magnetic conduction channel are made of iron-based powder metallurgy, and the permanent magnet is made of hard magnetic powder metallurgy.
4. The electric machine rotor as recited in claim 2, wherein the cross-section of adjacent magnetically conductive channels is adapted to the cross-section of the permanent magnets; the permanent magnets and the magnetic conduction channels are stacked alternately along the radial direction of the rotor core to form a magnetic pole group.
5. The electric machine rotor as recited in claim 4, wherein a plurality of the pole groups are provided along a circumferential direction of the rotor core.
6. The electric machine rotor as recited in claim 5, wherein the magnetically conductive channel at the outer peripheral side of the rotor core is formed with a concave structure.
7. The motor rotor as claimed in claim 2, further comprising a shaft sleeve, wherein the outer periphery of the shaft sleeve forms a limiting structure, correspondingly, the rotor core forms a mounting hole, and the shaft sleeve is embedded in the mounting hole and connected with the rotor core through the limiting structure;
and a connecting key is formed on the inner peripheral side of the shaft sleeve and is used for connecting with a motor spindle.
8. A method of manufacturing an electric machine rotor according to any of claims 1-7, characterized in that the electric machine rotor further comprises an electric machine rotor mold formed with a rotor core site, a magnetically conductive channel site and a magnetic barrier groove; the manufacturing method comprises the following steps:
filling soft magnetic powder metallurgy materials into the rotor iron core position and the magnetic conduction channel position, and inlaying magnetic barrier groove pieces into the magnetic barrier grooves;
pressing and sintering the soft magnetic powder metallurgy material to preliminarily form the soft magnetic powder metallurgy material;
the magnetic barrier groove piece is pulled out of the magnetic barrier groove, and hard magnetic powder metallurgy materials are filled into the magnetic barrier groove;
pressing and sintering the soft magnetic powder metallurgy material and the hard magnetic powder metallurgy material again, so that the soft magnetic powder metallurgy material is finally formed into the rotor core and the magnetic conduction channel, and the hard magnetic powder metallurgy material is formed into the permanent magnet;
and magnetizing the permanent magnet to form the motor rotor.
9. A method of manufacturing an electric machine rotor according to any of claims 1-7, characterized in that the electric machine rotor further comprises an electric machine rotor mold formed with a rotor core site, a magnetically conductive channel site and a magnetic barrier groove; the manufacturing method comprises the following steps:
placing the manufactured and magnetized permanent magnet as an insert in the magnetic barrier groove;
filling soft magnetic powder metallurgy materials into the rotor iron core position and the magnetic conduction channel position;
pressing and sintering the soft magnetic powder metallurgy material, and then forming the soft magnetic powder metallurgy material into the rotor core and the magnetic conduction channel;
the rotor core, the magnetic conduction channel and the permanent magnet form the motor rotor.
10. A permanent-magnet assisted reluctance machine comprising a machine rotor according to any of claims 1 to 7 or a method of manufacturing a machine rotor according to claim 8 or a method of manufacturing a machine rotor according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110987656.7A CN113783327A (en) | 2021-08-26 | 2021-08-26 | Motor rotor, manufacturing method of motor rotor and permanent magnet auxiliary reluctance motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110987656.7A CN113783327A (en) | 2021-08-26 | 2021-08-26 | Motor rotor, manufacturing method of motor rotor and permanent magnet auxiliary reluctance motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113783327A true CN113783327A (en) | 2021-12-10 |
Family
ID=78839500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110987656.7A Pending CN113783327A (en) | 2021-08-26 | 2021-08-26 | Motor rotor, manufacturing method of motor rotor and permanent magnet auxiliary reluctance motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113783327A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202200012713A1 (en) * | 2022-06-15 | 2023-12-15 | Fiat Ricerche | PERMANENT MAGNET ROTOR FOR ELECTRIC MOTORS AND METHOD FOR ITS CONSTRUCTION |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002359941A (en) * | 2001-05-30 | 2002-12-13 | Isuzu Motors Ltd | Dynamo-electric machine |
| US20030062791A1 (en) * | 2001-10-03 | 2003-04-03 | Reiter Frederick B. | Manufacturing method and composite powder metal rotor assembly for synchronous reluctance machine |
| CN107852046A (en) * | 2015-07-17 | 2018-03-27 | 西门子公司 | Reluctance rotor with additional own magnetized portion |
| CN109167502A (en) * | 2018-09-21 | 2019-01-08 | 沈阳工业大学 | A kind of permanent magnetism auxiliary cage barrier rotors synchronous motor |
| CN112821608A (en) * | 2021-01-22 | 2021-05-18 | 珠海格力电器股份有限公司 | Rotor punching sheet, rotor core, motor rotor, assembling method and motor |
-
2021
- 2021-08-26 CN CN202110987656.7A patent/CN113783327A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002359941A (en) * | 2001-05-30 | 2002-12-13 | Isuzu Motors Ltd | Dynamo-electric machine |
| US20030062791A1 (en) * | 2001-10-03 | 2003-04-03 | Reiter Frederick B. | Manufacturing method and composite powder metal rotor assembly for synchronous reluctance machine |
| CN107852046A (en) * | 2015-07-17 | 2018-03-27 | 西门子公司 | Reluctance rotor with additional own magnetized portion |
| CN109167502A (en) * | 2018-09-21 | 2019-01-08 | 沈阳工业大学 | A kind of permanent magnetism auxiliary cage barrier rotors synchronous motor |
| CN112821608A (en) * | 2021-01-22 | 2021-05-18 | 珠海格力电器股份有限公司 | Rotor punching sheet, rotor core, motor rotor, assembling method and motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202200012713A1 (en) * | 2022-06-15 | 2023-12-15 | Fiat Ricerche | PERMANENT MAGNET ROTOR FOR ELECTRIC MOTORS AND METHOD FOR ITS CONSTRUCTION |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0889574B1 (en) | Reluctance type rotating machine with permanent magnets | |
| JP6026023B2 (en) | Rotating electric machine | |
| CN101741153B (en) | Armature core, motor and axial gap electrical rotating machine using same and method for making same | |
| JP4096843B2 (en) | Motor and manufacturing method thereof | |
| JP5502571B2 (en) | Permanent magnet rotating electric machine | |
| CN109687616B (en) | Novel permanent magnet magnetism-assisted synchronous reluctance motor | |
| JP2008022663A (en) | Rotating electric machine | |
| CN109167502B (en) | Permanent magnet auxiliary cage barrier rotor synchronous motor | |
| CN109245468B (en) | Birotor synchronous motor adopting permanent magnet auxiliary cage barrier rotor | |
| CN101800456B (en) | Method for preparing amorphous alloy stator core by using modular mode | |
| CN114448129A (en) | Motor rotor without external magnetic bridge | |
| CN113783327A (en) | Motor rotor, manufacturing method of motor rotor and permanent magnet auxiliary reluctance motor | |
| JP4032280B2 (en) | AC motor stator manufacturing method | |
| WO2018016026A1 (en) | Motor and air conditioner | |
| JP3607137B2 (en) | Permanent magnet embedded rotor | |
| CN218633493U (en) | Motor rotor, motor and compressor | |
| CN218387000U (en) | Motor rotor with magnetic barrier, motor and compressor | |
| JP2006136130A (en) | Permanent-magnet type rotating electric machine, manufacturing method for permanent magnet for use therein, and manufacturing method therefor using the method for permanent magnet | |
| CN216290362U (en) | Mixed material synchronous reluctance motor rotor structure and synchronous reluctance motor | |
| CN114094738B (en) | Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor | |
| CN217063531U (en) | Permanent magnet auxiliary synchronous reluctance motor with double-rotor structure | |
| CN114123580A (en) | Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor | |
| CN113726047A (en) | Motor rotor and permanent magnet auxiliary reluctance motor with same | |
| CN112671133A (en) | Rotor structure and motor | |
| CN114024378B (en) | Mixed material synchronous reluctance motor rotor structure and synchronous reluctance motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211210 |