CN114374285A - Permanent magnet rotor structure, permanent magnet motor and electric automobile - Google Patents
Permanent magnet rotor structure, permanent magnet motor and electric automobile Download PDFInfo
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- CN114374285A CN114374285A CN202210038971.XA CN202210038971A CN114374285A CN 114374285 A CN114374285 A CN 114374285A CN 202210038971 A CN202210038971 A CN 202210038971A CN 114374285 A CN114374285 A CN 114374285A
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- 239000000463 material Substances 0.000 claims abstract description 21
- 239000000696 magnetic material Substances 0.000 claims abstract description 5
- 230000004308 accommodation Effects 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 2
- 238000004088 simulation Methods 0.000 description 23
- 230000004907 flux Effects 0.000 description 21
- 238000002955 isolation Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000011231 conductive filler Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
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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
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The disclosure relates to the technical field of permanent magnet motors, in particular to a permanent magnet rotor structure, a permanent magnet motor and an electric automobile, wherein the permanent magnet rotor structure comprises a rotor core body and rotor core split bodies, a plurality of accommodating grooves are formed in the outer wall of the rotor core body and are axially arranged along the rotor core body, and the rotor core split bodies are respectively arranged in each accommodating groove; the rotor core split bodies are connected with the rotor core body through connecting pieces made of non-magnetic materials, first accommodating spaces are formed between the rotor core split bodies and the bottoms of the accommodating grooves at intervals, and permanent magnets are arranged in the first accommodating spaces; and a second accommodating space is formed between the rotor core split body and the side walls of the permanent magnet and the accommodating groove at intervals. In the scheme of the disclosure, under the condition of the same permanent magnet torque, the overall cost of the motor can be reduced; under the condition of the same permanent magnet material consumption, the effective magnetic field for generating the permanent magnet torque is effectively enhanced, and under the condition of approximate cost, the permanent magnet torque of the permanent magnet rotor can be effectively improved.
Description
Technical Field
The disclosure relates to the technical field of permanent magnet motors, in particular to a permanent magnet rotor structure, a permanent magnet motor and an electric automobile.
Background
The permanent magnet motor mainly comprises a stator, a rotor, an end cover and other parts, wherein permanent magnet materials (permanent magnets) are arranged on the rotor, and the permanent magnet motor is divided into a surface-mounted type and a built-in type according to different arrangement modes of the permanent magnet materials.
In the built-in rotor structure, permanent magnet materials are arranged in the rotor along the axial direction of a rotor iron core, and the built-in rotor structure is further divided into a single V configuration, a double I configuration and the like according to different arrangement positions and arrangement forms of the permanent magnet materials.
In the existing built-in permanent magnet rotor, the phenomenon of magnetic flux leakage exists, and partial magnetic field intensity can be lost. Taking the "single" configuration interior permanent magnet rotor as an example, as shown in fig. 1, it is illustrated that 1/3 portions of the cross section of the existing interior "single" configuration permanent magnet rotor in the direction perpendicular to the rotation axis are one pair of pole portions of a 6-pole (3-pole) rotor. The permanent magnet rotor in the figure comprises a rotor core 1', permanent magnets 2', air or other non-magnetically conductive filler material 3' and a magnetic bridge 101.
As shown in fig. 1, with the internal permanent magnet rotor structure, the rotor can provide a D-axis magnetic field loop (thick solid line arrow in the figure) and also can provide a Q-axis magnetic field loop (thick dotted line arrow in the figure), and under the action of the stator current (magnetic field) of the motor, the motor can generate not only permanent magnet torque but also reluctance torque. The existence of the reluctance torque is beneficial to reducing the permanent magnet flux linkage under the condition of the same torque output, so that the consumption of the permanent magnet is correspondingly reduced, and the cost is reduced; the magnetic flux-reducing valve is also beneficial to providing larger torque and power in a magnetic flux-reducing state; and the permanent magnet is arranged in the rotor core, so that the centrifugal force can be overcome, and the permanent magnet can not be thrown out. Due to the characteristics, the permanent magnet motor used by the existing electric automobile generally adopts a built-in permanent magnet rotor.
However, since the permanent magnet is disposed inside the rotor core, and the core magnetic isolation bridge is made of a magnetic conductive material, as shown in fig. 2, the permanent magnetic field passes through the magnetic isolation bridge to form a magnetic circuit with short-circuited positive and negative poles, i.e., a thin dotted coil as shown in the figure. The size of the leakage magnetic field of the magnetic isolation bridge is related to the width of the magnetic isolation bridge. From the angle that reduces the magnetic leakage, it is better that the width of magnetic isolation bridge is the less, however, magnetic isolation bridge need have sufficient intensity simultaneously, guarantees that magnetic isolation bridge can not split when the rotor is rotatory to avoid the permanent magnet to deviate from, consequently, according to the height of motor speed magnetic isolation bridge need ensure at certain width within range. Therefore, in the current permanent magnet rotor structure, due to the presence of the magnetic isolation bridge, the magnetic flux of the leakage magnetic field can account for 1/3 of the total magnetic field flux generated by the permanent magnet, i.e. about 1/3 of the magnetic field strength is wasted.
Disclosure of Invention
In order to solve at least the above technical problems in the prior art, the embodiments of the present disclosure provide a permanent magnet rotor structure, a permanent magnet motor, and an electric vehicle.
The embodiment of the present disclosure provides a permanent magnet rotor structure, including a rotor core body and rotor core split bodies, wherein a plurality of accommodating grooves are arranged on an outer wall of the rotor core body along an axial direction of the rotor core body, and each accommodating groove is internally provided with the rotor core split body; the rotor core split body is connected with the rotor core body through a connecting piece made of a non-magnetic material, a first accommodating space is formed between the rotor core split body and the bottom of the accommodating groove at intervals, and a permanent magnet is arranged in the first accommodating space; and a second accommodating space is formed between the rotor core split body and the side walls of the permanent magnet and the accommodating groove at intervals.
In some embodiments, no filler material is disposed within the second receiving space; or the second accommodating space is filled with non-magnetic materials.
In some embodiments, the bottom of the accommodating groove includes a first plane, an opposite surface of the rotor core division body to the first plane is a second plane, and the first plane and the second plane are arranged in parallel; the first accommodating space is filled with the rectangular permanent magnet.
In some embodiments, the rotor core division body is connected with the rotor core body by at least one connecting piece; the connecting piece is arranged in the first accommodating space and is arranged along the axial direction of the rotor core body, the first accommodating space is divided into a plurality of subspaces through the connecting piece, and the permanent magnet is arranged in each of the subspaces.
In some embodiments, a boss is disposed between two adjacent accommodating grooves of the rotor core body; the boss comprises two side faces and a top face, and the side face of the boss is the side wall of the accommodating groove.
In some embodiments, the side surface of the boss is arc-shaped, and the cross-sectional shape is an arc-shaped curve.
In some embodiments, the surface of the rotor core division body away from the bottom of the accommodating groove and the top surface of the boss are curved surfaces and are located on the same circumference.
In some embodiments, the plurality of receiving grooves are uniformly or non-uniformly arranged along a circumferential direction of the rotor core body, and the plurality of bosses are uniformly or non-uniformly arranged along the circumferential direction of the rotor core body.
Another aspect of the embodiments of the present disclosure provides a permanent magnet motor, including the above permanent magnet rotor structure.
In another aspect, an electric vehicle includes the above permanent magnet rotor structure or the above permanent magnet motor.
According to the permanent magnet rotor structure, the permanent magnet motor and the electric automobile, the magnetic isolation bridge structure is omitted in the permanent magnet rotor, and a magnetic field short circuit loop formed by a permanent magnet field through the magnetic isolation bridge is isolated, so that magnetic leakage is greatly reduced. Under the condition of the same permanent magnet torque, the consumption of the required permanent magnet is greatly reduced, and the overall cost of the motor can be further reduced; and under the condition of the same permanent magnet material consumption, the effective magnetic field for generating the permanent magnet torque is effectively enhanced, so that the permanent magnet torque of the permanent magnet rotor can be effectively improved under the condition of approximate cost.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
FIG. 1 is a partial schematic view of a prior art permanent magnet rotor;
FIG. 2 is a partial schematic view of a prior art permanent magnet rotor;
fig. 3 is a partial schematic view of a permanent magnet rotor structure according to an embodiment of the present disclosure;
FIG. 4 is a diagram of a simulation model of a rotor of an electric machine according to an embodiment of the present disclosure;
FIG. 5 is a diagram of a simulation model of a motor rotor in the prior art;
fig. 6 is a schematic no-load magnetic field diagram of a simulation model of a motor rotor provided in the embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a no-load magnetic field of a simulation model of a motor rotor in the prior art;
fig. 8 is a comparison diagram of no-load air gap flux density between a simulation model of a motor rotor provided in the embodiment of the present disclosure and a simulation model of a motor rotor in the prior art.
In the figure:
1': a rotor core: 2': a permanent magnet; 3': a non-magnetically conductive filler material; 101: a magnetic isolation bridge;
1: a rotor core body; 102: the rotor core is split; 2: a permanent magnet; 3: a non-magnetically conductive filler material; 4: a boss; 5: a connecting member; 6: a side surface.
Detailed Description
In order to make the objects, features and advantages of the present disclosure more apparent and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
As shown in fig. 3, the permanent magnet rotor structure provided by the present disclosure includes a rotor core body 1 and a rotor core split body 102, wherein a plurality of accommodating grooves are formed in an outer wall of the rotor core body 1 and axially arranged along the rotor core body 1, and the rotor core split body 102 is respectively arranged in each accommodating groove; the rotor core split body 102 is connected with the rotor core body 1 through a connecting piece 5 made of a non-magnetic material with high mechanical strength, a first accommodating space is formed between the rotor core split body 102 and the bottom of the accommodating groove at intervals, and a permanent magnet 2 is arranged in the first accommodating space; the rotor core division body 102 and the permanent magnet 2 are arranged at intervals with the side wall of the accommodating groove to form a second accommodating space.
In some embodiments, the rotor core body 102 is connected to the rotor core body 1 through the connecting member 5, the rotor core body 102 connected through the connecting member 5 can be fixedly connected to the rotor core body 1, and the permanent magnet 2 is disposed in the first accommodating space between the rotor core body 102 and the rotor core body 1, so that when the rotor core structure is used, the permanent magnet 2 cannot fall off due to centrifugal force because of stable connection between the rotor core body 102 and the rotor core body 1, that is, the connecting body structure provided by the present disclosure plays a role in preventing the permanent magnet from falling off in the prior art; meanwhile, in the permanent magnet rotor structure provided by the embodiment of the disclosure, since the magnetic isolation bridge structure is cancelled, a magnetic field short circuit loop formed by the permanent magnet magnetic field through the magnetic isolation bridge is isolated, so that the magnetic leakage is greatly reduced.
For example, the connecting member 5 is made of a stainless steel material having non-magnetic conductivity, or is made of other materials having non-magnetic conductivity, and the embodiment of the present disclosure is not limited thereto. For example, the connection member 5 is welded, clamped or integrally formed with the rotor core body 1 and the rotor core separation body 102, and the specific connection mode is not limited in the embodiment of the present disclosure.
For example, no filling material is disposed in the second accommodating space, that is, the second accommodating space is filled with air; or the second accommodating space is filled with the non-magnetic conductive filling material 3. The non-magnetically conductive filling material 3 may be, for example, epoxy resin. The two ends of the rotor core division body 102 are separated from the rotor core body 1 by the second accommodating space, that is, the two ends of the rotor core division body 102 are not in contact with the rotor core body 1, and there is no magnetic isolation bridge structure.
For example, the accommodating groove includes a first plane at the bottom, an opposite surface of the rotor core division body 102 and the first plane is a second plane, and the first plane and the second plane are arranged in parallel; a rectangular parallelepiped permanent magnet 2 is placed in the first accommodation space. The first plane and the second plane are arranged in parallel to form a first accommodation space in which the permanent magnet 2 can be disposed, for example, the permanent magnet 2 has a rectangular parallelepiped shape. For example, according to the design requirements of the permanent magnet rotor/permanent magnet motor, the depth and the width of the accommodating groove are set, the width of the second plane is set, the parameters are set to adjust the depth and the width of the first accommodating space, and the dosage of the permanent magnet 2 can be adjusted.
For example, the permanent magnet 2 and the first receiving space are generally connected by a clearance fit. The permanent magnet 2 may be further fixed with the first receiving space by other fixing means. For example, an adhesive or a snap-fit connection is used.
In some embodiments, the rotor core division 102 is connected with the rotor core body 1 by at least one connection piece 5; the connecting piece 5 is arranged in the first accommodating space and is arranged along the axial direction of the rotor core body 1, the first accommodating space is divided into a plurality of subspaces through the connecting piece 5, and the permanent magnet 2 is arranged in each subspace. The number of the connecting members 5 in the first receiving space may be one or more, and the connecting members 5 are arranged side by side with the permanent magnets 2. The specific number may be determined according to the design requirements of the rotor. For example, when the length and width of the first receiving space are large, a plurality of the connecting members 5 may be provided.
For example, when one connecting member 5 is provided, the connecting member 5 is provided at a central position or a position close to the central position, the first accommodation space is divided into two subspaces by one connecting member 5, and the permanent magnet 2 is provided in each of the subspaces. For example, when two connecting members 5 are provided, the two connecting members 5 are uniformly arranged in the width direction of the first accommodating space, the first accommodating space is divided into three subspaces by the two connecting members 5, and the permanent magnet 2 is provided in each of the subspaces.
In some embodiments, a boss 4 is disposed between two adjacent receiving slots of the rotor core body 1; the boss 4 comprises two side surfaces 6 and a top surface, the side surfaces 6 of the boss 4 being side walls of the receiving groove. The permanent magnet rotor is provided with the boss 4 which has the following functions: the magnetic circuit is used for forming a Q-axis magnetic circuit, and is beneficial to improving the salient pole rate of the motor, so that the reluctance torque of the motor is improved, and the total torque of the motor is improved.
For example, the boss 4 is a part of the rotor core body 1, that is, the boss 4 and the rotor core body 1 are an integral structure. When the rotor core body 1 is provided with the accommodating grooves, a boss 4 structure is formed between two adjacent accommodating grooves. For example, a plurality of receiving grooves are uniformly arranged in the circumferential direction of the rotor core body 1, the permanent magnets 2 in the receiving grooves are also uniformly arranged in the circumferential direction of the rotor core body 1, and the intervals between the receiving grooves are the same, that is, the sizes of the plurality of bosses 4 are the same.
For example, when the housing grooves are uniformly arranged in the circumferential direction of the rotor core body 1, the corresponding bosses 4 are also uniformly arranged in the circumferential direction of the rotor core body 1. In the embodiment of the present disclosure, the arrangement manner of the receiving grooves and the bosses 4 is not limited to be uniformly arranged along the circumferential direction of the rotor core body 1, and for example, may also be non-uniformly arranged.
For example, the rotor core body 1 includes 6 receiving slots and corresponding rotor core split 102 structures, and the 6 receiving slots are uniformly arranged along the circumferential direction of the rotor core body 1.
For example, the side surface 6 of the boss 4 is curved, and the sectional shape thereof is an arc curve. The arc-shaped curve is beneficial to reducing the cogging torque and the torque fluctuation of the permanent magnet motor.
In some embodiments, the surface of the rotor core division body 102 away from the bottom of the accommodation groove and the top surface of the boss 4 are curved surfaces and are located on the same circumference. In the embodiment of the present disclosure, the rotor core division body 102 is a part of the structure of the rotor core body 1, and the entire structure of the rotor is a cylindrical structure, so that the surface of the rotor core division body 102 away from the bottom of the accommodating slot and the top surface of the boss 4 are both curved surfaces with the same curvature.
The permanent magnet rotor structure provided by the embodiments of the present disclosure is further described below with reference to specific embodiments.
According to the content of the torque formula (1) of the interior permanent magnet motor, the torque T of the motor is the sum of reluctance torques of permanent magnet torques, wherein the reluctance torques are different from the inductance difference between the d axis and the q axis (namely L)q-Ld) And with current (i.e. I)d·Iq) Correlation; permanent magnet torque and permanent magnet flux linkage psifAnd current IqCorrelation, i.e. permanent magnet torque with permanent magnet flux linkage psifIs in direct proportion. From the contents of equation (2), the permanent magnetic linkage psifProportional to the product of the permanent magnet flux phi and the number of turns N of the stator winding. The permanent magnetic flux phi is the total magnetic flux generated by permanent magnet minus the magnetic leakage, and the magnetic leakage of the built-in permanent magnet motor is mainly generated by a rotor core magnetic isolation bridge.
ψf∝φ·N (2)
As can be seen from the formulas (1) and (2), the permanent magnetic linkage psi can be increased by reducing the magnetic leakage and increasing the permanent magnetic flux phifThereby the permanent magnet torque and the total torque of the motor can be increased; that is, in the case where the same total torque and reluctance torque are constant, the total magnetic flux generated by the permanent magnet can be reduced by reducing the leakage flux. The total magnetic flux generated by the permanent magnet is related to the volume of the permanent magnet and the design of the stator and rotor magnetic paths of the motor, and under the condition that the design of the magnetic paths is not changed, the total magnetic flux generated by the permanent magnet is only related to the volume of the permanent magnet, so that the volume of the permanent magnet can be reduced by reducing the total magnetic flux of the permanent magnet, the permanent magnet consumption of the motor is reduced, and the motor cost is reduced.
As shown in fig. 4 and 5, fig. 4 is a simulation model of a rotor of an electric machine provided in an embodiment of the present disclosure, and fig. 5 is a simulation model of a rotor of an electric machine in the prior art. As can be seen from fig. 4, in the simulation model of the motor rotor, both sides of the permanent magnet are not filled, i.e., air is filled.
As shown in fig. 6 and 7, fig. 6 and 7 are schematic diagrams of no-load magnetic fields of the simulation models of the motor rotor shown in fig. 4 and 5, respectively. Wherein, the simulation conditions of the comparison of the no-load magnetic field comprise: the same stator is used and the operating points of the permanent magnets (i.e. the flux densities of the permanent magnets in the unloaded magnetic circuit) are ensured to be substantially close. As can be seen from fig. 6, the magnetic density of the no-load operating point of the permanent magnet of the motor rotor simulation model provided in the embodiment of the present disclosure is about 1.16, and as can be seen from fig. 7, the magnetic density of the no-load operating point of the permanent magnet of the motor rotor simulation model in the prior art is about 1.06, that is, the operating point of the permanent magnet of the motor rotor simulation model provided in the embodiment of the present disclosure is higher, so that the permanent magnet is less susceptible to demagnetization under the same stator scheme and stator current.
Under the precondition, the no-load air gap flux densities of the two motor rotor simulation models are compared, as shown in fig. 8, a curve indicated by a reference numeral first in the figure is the no-load air gap flux density of the motor rotor simulation model provided by the embodiment of the present disclosure, and a curve indicated by a reference numeral second is the air gap flux density of the motor rotor simulation model in the prior art, as can be seen from fig. 8, although the peak value of the air gap flux density of the motor rotor simulation model provided by the embodiment of the present disclosure is slightly higher, the average value (upper right corner) of the two is equal.
Therefore, under the condition of the same permanent magnet torque, the volume of the permanent magnet (i.e. the amount of the permanent magnet) of the motor rotor simulation model provided by the embodiment of the disclosure is only 1/3 of the permanent magnet motor rotor of the motor rotor simulation model in the prior art, and the cost of the permanent magnet material accounts for 1/3 of the total cost of the motor, so that the cost of the motor rotor simulation model provided by the embodiment of the disclosure is lower.
Or, considering from another aspect, under the condition of the same usage amount of the permanent magnets, the permanent magnet torque of the motor rotor simulation model provided by the embodiment of the disclosure can be effectively improved compared with that of the motor rotor simulation model in the prior art.
In some embodiments, the disclosed embodiments also provide a permanent magnet motor and an electric vehicle, the permanent magnet motor includes the above permanent magnet rotor structure, and the electric vehicle includes the above permanent magnet rotor structure or the above permanent magnet motor.
According to the permanent magnet motor and the electric automobile, the magnetic leakage can be effectively reduced through the permanent magnet rotor structure, the consumption of the required permanent magnet is greatly reduced under the condition of the same permanent magnet torque, and the overall cost of the motor can be further reduced; and under the condition of the same permanent magnet material consumption, the effective magnetic field for generating the permanent magnet torque is effectively enhanced, so that the permanent magnet torque of the permanent magnet rotor can be effectively improved under the condition of approximate cost.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and shall be covered by the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. A permanent magnet rotor structure comprises a rotor core body (1) and rotor core split bodies (102), wherein a plurality of accommodating grooves which are axially arranged along the rotor core body (1) are formed in the outer wall of the rotor core body (1), and the rotor core split bodies (102) are respectively arranged in each accommodating groove;
the rotor core split body (102) is connected with the rotor core body (1) through a connecting piece (5) made of a non-magnetic material, a first accommodating space is formed between the rotor core split body (102) and the bottom of the accommodating groove at intervals, and a permanent magnet (2) is arranged in the first accommodating space;
and a second accommodating space is formed between the rotor core split body (102) and the permanent magnet (2) and the side wall of the accommodating groove at intervals.
2. A permanent magnet rotor structure according to claim 1, wherein no filler material is provided in the second accommodation space; or
And a non-magnetic conductive filling material (3) is filled in the second accommodating space.
3. The permanent magnet rotor structure according to claim 1, wherein the bottom of the receiving groove comprises a first plane, and the opposite surface of the rotor core division body (102) to the first plane is a second plane, and the first plane and the second plane are arranged in parallel;
the first accommodating space is filled with the rectangular permanent magnet (2).
4. A permanent magnet rotor structure according to claim 1, wherein said rotor core division body (102) is connected with said rotor core body (1) by at least one of said connecting pieces (5);
the connecting piece (5) is arranged in the first accommodating space and is arranged along the axial direction of the rotor core body (1), the first accommodating space is divided into a plurality of subspaces through the connecting piece (5), and the permanent magnets (2) are arranged in the subspaces respectively.
5. A permanent magnet rotor structure according to claim 1, wherein a boss (4) is provided between two adjacent receiving slots of said rotor core body (1);
the boss (4) comprises two side faces (6) and a top face, and the side faces (6) of the boss (4) are side walls of the accommodating groove.
6. A permanent magnet rotor structure according to claim 5, wherein the side faces (6) of the boss (4) are arc-shaped, the cross-sectional shape of which is an arc-shaped curve.
7. A permanent magnet rotor structure according to claim 5, wherein the faces of the rotor core segments (102) remote from the bottom of the receiving slots and the top faces of the bosses (4) are curved and located on the same circumference.
8. A permanent magnet rotor structure according to claim 5, wherein a plurality of said receiving slots are arranged uniformly or non-uniformly in the circumferential direction of said rotor core body (1), and a plurality of said bosses (4) are arranged uniformly or non-uniformly in the circumferential direction of said rotor core body (1).
9. A permanent magnet electrical machine comprising a permanent magnet rotor structure according to any of claims 1 to 8.
10. An electric vehicle comprising a permanent magnet rotor structure according to any of claims 1 to 8 or a permanent magnet machine according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210038971.XA CN114374285B (en) | 2022-01-13 | 2022-01-13 | Permanent magnet rotor structure, permanent magnet motor and electric automobile |
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| CN202210038971.XA CN114374285B (en) | 2022-01-13 | 2022-01-13 | Permanent magnet rotor structure, permanent magnet motor and electric automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696495A (en) * | 2022-05-07 | 2022-07-01 | 南京晓庄学院 | Mixed laminated rotor structure for improving stability of working point of permanent magnet |
| CN117154978A (en) * | 2023-08-30 | 2023-12-01 | 哈尔滨理工大学 | High-speed built-in permanent magnet motor rotor structure |
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| CN106104972A (en) * | 2014-01-06 | 2016-11-09 | 三菱电机株式会社 | Permanent-magnet type electric rotating machine |
| EP3522336A1 (en) * | 2018-02-01 | 2019-08-07 | Baumüller Nürnberg GmbH | Rotor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696495A (en) * | 2022-05-07 | 2022-07-01 | 南京晓庄学院 | Mixed laminated rotor structure for improving stability of working point of permanent magnet |
| CN117154978A (en) * | 2023-08-30 | 2023-12-01 | 哈尔滨理工大学 | High-speed built-in permanent magnet motor rotor structure |
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| CN114374285B (en) | 2023-08-25 |
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