CN112583151A - Rotor of motor, driving motor and vehicle - Google Patents
Rotor of motor, driving motor and vehicle Download PDFInfo
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- CN112583151A CN112583151A CN201910942431.2A CN201910942431A CN112583151A CN 112583151 A CN112583151 A CN 112583151A CN 201910942431 A CN201910942431 A CN 201910942431A CN 112583151 A CN112583151 A CN 112583151A
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- 210000005056 cell body Anatomy 0.000 claims description 14
- 230000004907 flux Effects 0.000 abstract description 25
- 239000002131 composite material Substances 0.000 abstract description 8
- 230000005347 demagnetization Effects 0.000 abstract description 7
- 230000005389 magnetism Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
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- 230000008569 process Effects 0.000 description 3
- 230000009194 climbing Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a rotor of a motor, a driving motor and a vehicle, wherein the rotor comprises: a rotor core; the first permanent magnets extend along the radial direction of the rotor core and are distributed at intervals along the circumferential direction of the rotor core, two second permanent magnets are arranged between every two adjacent first permanent magnets, the radial inner ends of the two second permanent magnets positioned between every two adjacent first permanent magnets are close to each other, the radial outer ends of the two second permanent magnets positioned between every two adjacent first permanent magnets are far away from each other, the sectional area of each first permanent magnet is S1, the sectional area of each second permanent magnet is S2,
according to the rotor provided by the embodiment of the invention, the radial permanent magnet formed by the first permanent magnet and the V-shaped permanent magnet formed by the two second permanent magnets are in composite design, so that the rotor has the advantages of small magnetic leakage, good demagnetization resistance, large air gap flux density and the like, the optimal matching of permanent magnet torque and reluctance torque is realized, the electromagnetic torque of the motor is high, and the torque performance is highThe performance of energy and weak magnetism is good.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a rotor of a motor, a driving motor and a vehicle.
Background
Due to the existence of reluctance torque, the built-in permanent magnet synchronous motor can realize the improvement of torque density and the effective widening of the operating range of a constant power area. However, the motor rotor in the related art cannot fully utilize reluctance torque, and has a small output torque, thereby limiting the application of the motor.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the invention to provide a rotor for an electrical machine, which rotor has an improved electromagnetic torque and an optimal combination of permanent magnet torque and reluctance torque.
Another object of the present invention is to provide a driving motor having the above rotor.
Another object of the present invention is to provide a vehicle having the above-described drive motor.
A rotor of a motor according to an embodiment of the present invention includes: a rotor core; a plurality of first permanent magnets and a plurality of second permanent magnets, the first permanent magnets and the second permanent magnets being mounted on the rotor core, the plurality of first permanent magnets extending in a radial direction of the rotor core and being distributed at intervals in a circumferential direction of the rotor core, two second permanent magnets being disposed between two adjacent first permanent magnets, ends of the two second permanent magnets located between two adjacent first permanent magnets, which are close to a center of the rotor core, being close to each other and ends of the two second permanent magnets located between two adjacent first permanent magnets, which are far from the center of the rotor core, being far from each other, a cross-sectional area of each first permanent magnet perpendicular to an axial direction of the rotor core being S1, and a cross-sectional area of each second permanent magnet perpendicular to the axial direction of the rotor core being S2, wherein,
according to the rotor of the motor provided by the embodiment of the invention, the first permanent magnet is formed into the radial permanent magnet extending along the radial direction of the rotor iron core by arranging the first permanent magnet and the second permanent magnet at the same time, the two second permanent magnets are formed into the V-shaped permanent magnet, the radial permanent magnet and the V-shaped permanent magnet are subjected to composite design, so that the rotor has the advantages of small magnetic leakage, good demagnetization resistance, large air gap flux density and the like, and the first permanent magnet and the second permanent magnet are arrangedThe ratio of the cross-sectional area of the body is satisfied
The optimal matching of the permanent magnet torque and the reluctance torque of the composite structure is realized, the electromagnetic torque of the motor is high, and the torque performance and the weak magnetic performance are good.
In addition, the rotor of the motor according to the above embodiment of the present invention may further have the following additional technical features:
according to the rotor of the motor of some embodiments of the present invention, the S1 and the S2 further satisfy:
according to some embodiments of the present invention, an outer diameter of the rotor core is D and an inner diameter thereof is D, a length between one end of the second permanent magnet away from a center of the rotor core and one end thereof close to the center of the rotor core is a, a width of the second permanent magnet is b, and an included angle formed by center lines extending in a length direction of two second permanent magnets located at both sides of the first permanent magnet is θ,
according to some embodiments of the present invention, the number of poles of the rotor is K, the outer diameter of the rotor core is D, the length between one end of the second permanent magnet away from the center of the rotor core and one end of the second permanent magnet close to the center of the rotor core is a, and an included angle formed by center lines extending in the length direction of the two second permanent magnets located at both sides of the first permanent magnet is θ,
according to some embodiments of the invention, the number of poles of the rotor is K, the rotor core has an outer diameter D and an inner diameter D, the first permanent magnet extends in a radial direction of the rotor core by a length m, and the second permanent magnet is distant from the rotor coreA length between one end of the center and one end near the center of the rotor core is a, wherein,
according to some embodiments of the invention, the first permanent magnet has a width n in a tangential direction of the rotor core and the second permanent magnet has a width b in a radial direction of the rotor core, wherein n ≧ b.
In some embodiments of the present invention, an outer diameter of the rotor core is D, and n and b further satisfy:
in some embodiments of the present invention, the rotor core is provided with a plurality of first air gap slots, at least a portion of each of the first air gap slots being located on a side of the first permanent magnet near a center of the rotor core.
In some embodiments of the present invention, the rotor core is provided with a first mounting groove for mounting the first permanent magnet, the first mounting groove communicating with the first air gap groove at a side of the first mounting groove near a center of the rotor core.
In some embodiments of the invention, the first air gap slot comprises: the first groove body is positioned on one side, close to the center of the rotor core, of the first permanent magnet, and the groove wall surface, far away from the first permanent magnet, of the first groove body in the radial direction of the rotor core is a plane; two second cell bodies, two the second cell body is located respectively first cell body is followed the both ends of rotor core's circumference, just the second cell body with first cell body intercommunication, two the second cell body is followed rotor core's radial outer end is located respectively first permanent magnet is followed the both sides of rotor core's circumference, two the second cell body is in two groove wall faces that keep away from each other in rotor core's circumference are the plane.
In some embodiments of the present invention, an included angle between the second groove body and a groove wall surface of the first installation groove, which is close to each other, is α, and α satisfies: alpha is more than or equal to 0 degree and less than or equal to 75 degrees.
In some embodiments of the present invention, an included angle between the second slot body and a slot wall surface of the first mounting slot, which is close to each other, is α, a length of the first permanent magnet extending in the radial direction of the rotor core is m, and a size of the slot wall surface of the second slot body, which is close to the first permanent magnet, extending in the radial direction of the rotor core is L, where L × cos α is ≦ m/3.
In some embodiments of the present invention, an included angle of two groove wall surfaces of the second groove body facing each other in a circumferential direction of the rotor core is β, and a pole number of the rotor is K, wherein,
in some embodiments of the present invention, the rotor core is further provided with a plurality of second air gap slots, and the second air gap slots are provided between two adjacent first air gap slots.
In some embodiments of the present invention, the rotor core is further provided with a plurality of second air gap slots, and the second air gap slots are provided between two adjacent first air gap slots.
In some embodiments of the present invention, a slot wall surface of the second air gap slot close to the center of the rotor core is a second inner wall surface, the second inner wall surface is a plane and extends in a tangential direction of the rotor core, a slot wall surface of the first air gap slot far from the first permanent magnet is a first inner wall surface, and the second inner wall surface and the first inner wall surface are both tangent to a same virtual circle.
In some embodiments of the invention, the groove wall surfaces of the second groove body and the adjacent second air gap groove which are close to each other are parallel to each other.
In some embodiments of the present invention, a slot wall surface of the second air gap slot, which is far away from the center of the rotor core, is a second outer wall surface, which is a plane and extends along a tangential direction of the rotor core, a slot wall surface of the second slot body, which is far away from the center of the rotor core in a radial direction of the rotor core, is a first outer wall surface, which is a plane, and the second outer wall surface located between two adjacent first mounting slots is coplanar with the first outer wall surface, or the first outer wall surface is an arc surface, and a plane of the second outer wall surface located between two adjacent first mounting slots is tangent to the first outer wall surface.
In some embodiments of the present invention, a magnetic bridge is formed between the first air gap slot and the adjacent second air gap slot, the magnetic bridge has a thickness p extending along a circumferential direction of the rotor core, the number of poles of the rotor is K, an outer diameter of the rotor core is D, the first permanent magnet has a length m extending along a radial direction of the rotor core, wherein,
in some embodiments of the present invention, the second air gap slot is parallel to each other along two slot wall surfaces opposed to each other in a circumferential direction of the rotor core and has a pitch q, wherein,
according to some embodiments of the invention, the number of poles of the rotor and the number of the first permanent magnets are equal, the number of the second permanent magnets is twice that of the first permanent magnets, the number of poles of the rotor is K, K is an even number and K is 4 ≤ and 12.
A drive motor according to an embodiment of the present invention includes a rotor of a motor according to an embodiment of the present invention.
A vehicle according to an embodiment of the present invention includes a drive motor according to an embodiment of the present invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view of a rotor according to some embodiments of the present invention;
FIG. 2 is a schematic structural view of a rotor according to some embodiments of the present invention, wherein permanent magnets are not shown in the figure;
FIG. 3 is a magnetic circuit diagram of a rotor according to some embodiments of the present invention;
FIG. 4 is a schematic structural view of a rotor according to further embodiments of the present invention;
FIG. 5 is a schematic structural view of a rotor according to further embodiments of the present invention, wherein permanent magnets are not shown;
FIG. 6 is a graph of electromagnetic torque and back emf for a rotor according to an embodiment of the present invention at various S1/S2 values.
Reference numerals:
a rotor 100; a first mounting groove 10; a second mounting groove 20; a first air gap slot 30; a first tank 31; a second tank 32; a first inner wall surface 33; a first outer wall surface 34; a second air gap groove 40; second inner wall surface 41; a second outer wall surface 42; a first permanent magnet 50; a second permanent magnet 60; a rotor core 70; a magnetic bridge 71.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention. In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features, and "a plurality" means two or more.
A rotor 100 of a motor, a driving motor, and a vehicle according to an embodiment of the present invention are described below with reference to the accompanying drawings.
Referring to fig. 1 to 5, a rotor 100 of a motor according to an embodiment of the present invention includes: a rotor core 70, a plurality of first permanent magnets 50, and a plurality of second permanent magnets 60.
Specifically, a plurality of first permanent magnets 50 and a plurality of second permanent magnets 60 are mounted on the rotor core 70, for example, in some embodiments, a plurality of first mounting grooves 10 and a plurality of second mounting grooves 20 are provided on the rotor core 70, the first mounting grooves 10 may be used to mount the first permanent magnets 50, and the second mounting grooves 20 may be used to mount the second permanent magnets 60.
The plurality of first permanent magnets 50 extend along the radial direction of the rotor core 70 and are distributed at intervals along the circumferential direction of the rotor core 70 to form a spoke type arrangement manner (spoke type arrangement manner) to form a parallel magnetic circuit, that is, each first permanent magnet 50 forms a different closed magnetic circuit as shown in fig. 3, so that the magnetic flux path of the rotor 100 is improved, the utilization rate of the first permanent magnets 50 of the motor is improved, key electromagnetic performance parameters such as no-load air gap magnetic flux density and no-load back electromotive force are also improved, and the overall performance of the motor is improved.
As shown in fig. 1 and 2, two second permanent magnets 60 are disposed between two adjacent first permanent magnets 50, and ends of the two second permanent magnets 60 located between the two adjacent first permanent magnets 50, which are close to the center of the rotor core 70, are close to each other and ends of the two second permanent magnets 60 located away from the center of the rotor core 70 are away from each other, so that the two second permanent magnets 60 between the two adjacent first permanent magnets 50 are generally formed as V-shaped permanent magnets, and openings of the V-shaped permanent magnets face away from the center of the rotor core 70. The second permanent magnet 60 can improve the exchange capability of electromagnetic properties, and further improve the demagnetization resistance of the two sides of the first permanent magnet 50 and the second permanent magnet 60. The first permanent magnet 50 and the second permanent magnet 60 form a series magnetic circuit, that is, the first permanent magnet 50 and the two second permanent magnets 60 on both sides form the same closed magnetic circuit as shown in fig. 3, and the series magnetic circuit is matched with a parallel magnetic circuit in a radial arrangement mode, so that the rotor 100 has the advantages of large torque, small magnetic flux leakage, difficult demagnetization of the permanent magnets of the series magnetic circuit, and also has the advantages of large air gap flux density, small torque ripple and the like of the parallel magnetic circuit.
Further, for the composite type rotor 100 in which the first permanent magnets 50 and the second permanent magnets 60 are simultaneously provided, in order to improve the electromagnetic torque, achieve the optimum matching of the permanent magnet torque and the reluctance torque, in the embodiment of the present invention, the sectional area of each first permanent magnet 50 perpendicular to the axial direction of the rotor core 70 is S1, the sectional area of each second permanent magnet 60 perpendicular to the axial direction of the rotor core 70 is S2, and S1 and S2 satisfy:
for example, in some embodiments,
and may be 0.8, 1, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, etc.
As shown in fig. 6, in the above ratio range, the electromagnetic torque T of the rotor 100 is relatively large, and the torque performance and the field weakening performance of the motor are relatively good, so that the application requirements of most motors can be met, for example, the application occasions of the motor working in a high rotation speed and wide speed regulation range can be met.
According to some embodiments of the present invention, the first permanent magnet 50 is formed as a radial permanent magnet extending in a radial direction of the rotor core 70 by arranging the first permanent magnet 50 and the second permanent magnet 60 at the same time, the two second permanent magnets 60 are formed as V-shaped permanent magnets, the radial permanent magnet and the V-shaped permanent magnet are compositely designed to provide the rotor 100 with advantages of small magnetic leakage, good demagnetization resistance, large air gap flux density, and the like, and a ratio of cross-sectional areas of the first permanent magnet 50 and the second permanent magnet 60 satisfies
The electromagnetic torque of the composite structure is improved, the optimal matching of the permanent magnet torque and the reluctance torque is realized, and the torque performance and the weak magnetic performance of the motor are good.
In some applications, such as main drive motors, there is a requirement for peak values of the line back emf at maximum motor speed. Considering that the motor is suddenly powered off when running at high speed, the motor continues to rotate at high speed due to inertia, and if the back electromotive force of the wire is too large at the moment, the back electromotive force is applied to the inverter, so that the inverter is burnt out. Therefore, the no-load back electromotive force of the motor at high speed is required to be less than a specific value E1. Referring to FIG. 6, in some embodiments of the invention, S1 and S2 further satisfy:
so that the counter potential of the wire is lower, the application requirement of the motor on the high-speed running occasion can be met, and the use is safer.
For the size design of the first permanent magnet 50 and the second permanent magnet 60, if the length of the second permanent magnet 60 is too long, the extension dimension of the second permanent magnet 60 in the circumferential direction of the rotor core 70 is too large, which affects the arrangement of the first permanent magnet 50 and the second permanent magnet 60 of the multi-pole rotor 100 and affects the mechanical strength of the rotor core 70; if the length of the second permanent magnet 60 is too small, the output torque of the rotor 100 is small, and the use requirement cannot be met. If the length of the first permanent magnet 50 is too long, an end portion of the first permanent magnet 50 close to the center of the rotor core 70 may not function as an output torque, which causes material waste and is not favorable for the mechanical strength of the rotor core 70; if the length of the first permanent magnet 50 is too small, it is not favorable for achieving the optimal matching of the permanent magnet torque and the reluctance torque, and is not favorable for maximizing the electromagnetic torque.
Therefore, in some embodiments of the present invention, as shown in fig. 1, the number of poles of the rotor 100 is K, the outer diameter of the rotor core 70 is D, the inner diameter of the rotor core 70 is D, the length of the first permanent magnet 50 extending in the radial direction of the rotor core 70 (i.e., the length of the first permanent magnet 50) is m, and one end of the second permanent magnet 60 away from the center of the rotor core 70 and close to the center of the rotor core 70 are mThe length between one ends of the center of the first permanent magnet 70, i.e., the length of the second permanent magnet 60, is a, wherein,
within the above size range, the requirements of the rotor core 70, such as high mechanical strength, high material utilization rate, and large electromagnetic torque, are considered.
In some embodiments of the present invention, as shown in fig. 1, with continued reference, the width of the first permanent magnet 50 (i.e. the dimension of the first permanent magnet 50 perpendicular to the self length direction, for example, the dimension of the first permanent magnet 50 along the tangential direction of the rotor core 70 in fig. 1) is n, the width of the second permanent magnet 60 along the radial direction of the rotor core 70 (i.e. the dimension of the second permanent magnet 60 perpendicular to the self length direction) is b, and n ≧ b, thereby, on the premise of ensuring the mechanical strength of the rotor core 70, increasing the width of the first permanent magnet 50 can effectively increase the saliency of the motor, enabling the motor to have excellent flux weakening capability, and have a wide speed regulation range.
Here, since the second permanent magnets 60 extend obliquely with respect to the tangential direction of the rotor core 70, the width direction of the second permanent magnets 60 is not strictly parallel to the radial direction of the rotor core 70, but is a direction slightly oblique to the radial direction of the rotor core 70, that is, a direction perpendicular to the longitudinal direction of the second permanent magnets 60 is the width direction.
In some embodiments of the invention, b, n and D satisfy:
to ensure that the values of b and n are sufficiently large. The larger the values of b and n are, the smaller the d-axis inductance of the motor is, the larger the salient pole ratio of the motor is, and the larger the reluctance torque of the motor is, so that the electromagnetic torque formed by the reluctance torque and the permanent magnet torque is increased, and the output torque of the motor is larger. In addition, the situation that the material consumption of the first permanent magnet 50 and the second permanent magnet 60 is too large due to too large values of b and n, which wastes materials and is not beneficial to increase or even reduce the motor is avoidedThe electromagnetic torque of (1).
In some embodiments of the present invention, as shown in fig. 1, the center lines of two second permanent magnets 60 located on both sides of a first permanent magnet 50 (the center line being a center line along the length direction of the second permanent magnet 60) form an included angle θ, and satisfy:
if the included angle between the two second permanent magnets 60 is too large, the inclination angle of the second permanent magnets 60 is too small, the depth of the formed V-shaped permanent magnet is too shallow, and the part of the rotor core 70, which is positioned outside the V-shaped permanent magnet (the side of the V-shaped permanent magnet, which is far away from the center of the rotor core 70), is easily saturated, so that a q-axis magnetic circuit is affected, and the electromagnetic torque of the motor is reduced; if the included angle between the two second permanent magnets 60 is too small, the inclination angle of the second permanent magnets 60 is too large, the depth of the formed V-shaped permanent magnet is too deep, the harmonic content in the air gap flux density is increased, and the torque ripple of the motor is increased. Therefore, when the included angle theta meets the conditions, the electromagnetic torque of the motor is ensured, the harmonic content is reduced, and the torque pulsation of the motor is reduced.
Furthermore, in some embodiments of the present invention, the included angle θ further satisfies:
the over-small value of the formula can cause the harmonic content of the air gap flux density to be large, the electromagnetic torque of the motor is small, when the value is over-large, the harmonic content of the air gap flux density is large, the rotor core 70 between the second permanent magnet 60 and the first permanent magnet 50 is easy to saturate, the d-axis and q-axis inductances are reduced, and the electromagnetic torque of the motor can also be reduced. Therefore, the electromagnetic torque of the motor can be made large within the above value range.
According to some embodiments of the present invention, the two second permanent magnets 60 located between two adjacent first permanent magnets 50 have the same size, so that the rotor 100 has a simpler structure, only one specification of permanent magnet needs to be produced in the production process, and a set of mold is needed, thereby simplifying the grooving and permanent magnet processing processes, and the magnetic field distribution of the rotor 100 is more uniform, thereby ensuring the output torque of the rotor 100 under different working conditions.
According to some embodiments of the present invention, as shown in fig. 1-2 and 4-5, rotor core 70 is further provided with a plurality of first air gap slots 30, at least a portion of each first air gap slot 30 being located on a side of first permanent magnet 50 near a center of rotor core 70. The first air gap groove 30 can effectively reduce the magnetic leakage at the end part of the first permanent magnet 50 and improve the material utilization rate.
In some embodiments of the present invention, as shown in fig. 2 and 5, the rotor core 70 is provided with a first mounting groove 10 for mounting the first permanent magnet 50, whereby the first air gap groove 30 provided at a side of the first permanent magnet 50 near the center of the rotor core 70 is also located at a side of the first mounting groove 10 for mounting the first permanent magnet 50 near the center of the rotor core 70. The first mounting groove 10 and the first air gap groove 30 at one side thereof near the center of the rotor core 70 may communicate to minimize end leakage flux and secure output torque.
The present invention is not particularly limited as to the specific structure of the first air gap slot 30, for example, in some embodiments, as shown in fig. 1 and 2, the first air gap slot 30 extends in a tangential direction of the rotor core 70, it being understood that the tangential direction of the rotor core 70 here refers to a tangential direction of the rotor core 70 passing through a center point of the first air gap slot 30. And both ends of the first air gap groove 30 in the circumferential direction of the rotor core 70 exceed both groove wall surfaces of the first mounting groove 10 in the circumferential direction of the rotor core 70, that is, the extension dimension of the first air gap groove 30 in the circumferential direction of the rotor core 70 is greater than the extension dimension of the first mounting groove 10 in the circumferential direction of the rotor core 70, so as to reduce the thickness of the magnetic bridge 71 between the first air gap groove 30 and the second air gap groove 40, improve the ability of reducing the leakage flux, and the first air gap groove 30 has a simple structure and is easy to process.
In other embodiments, as shown in fig. 4 and 5, the first air slot 30 includes a first slot body 31 and a second slot body 32. Wherein the first slot 31 is located at a side of the first permanent magnet 50 close to the center of the rotor core 70, for example, in an embodiment where the rotor core 70 is provided with the first mounting groove 10, the first mounting groove 10 may communicate with the first slot 31. The two second slot bodies 32 are respectively arranged at two ends of the first slot body 31 along the circumferential direction of the rotor core 70, the two second slot bodies 32 are both communicated with the end part of the first slot body 31, and the two second slot bodies 32 are respectively positioned at two sides of the first permanent magnet 50 along the circumferential direction of the rotor core along the radial outer end of the rotor core 70. That is, the first air gap groove 30 extends from the radially inner side of the first permanent magnet 50 to both circumferential sides of the first permanent magnet 50. Therefore, the extension length of the magnetic bridge 71 between two adjacent first air gap slots 30 along the radial direction of the rotor core 70 can be increased, the effect of reducing the magnetic leakage of the first permanent magnet 50 is better, the magnetic resistance of a d-axis magnetic circuit can be increased, the d-axis inductance is reduced, and the salient pole rate of the motor is increased.
Further, as shown in fig. 4 and 5, the groove wall surface of the first slot body 31 that is away from the first permanent magnet 50 in the radial direction of the rotor core 70 is a plane, and the two slot wall surfaces of the two second slot bodies 32 that are away from each other in the circumferential direction of the rotor core 70 are planes, so that the first air gap groove 30 is integrally formed as a shoe-shaped groove, which has a larger volume, and is advantageous for reducing the extension of the magnetic bridge in the circumferential direction of the rotor core 70 to significantly reduce magnetic leakage.
In some embodiments of the present invention, as shown in fig. 4 and 5, the included angle of the groove wall surfaces of the second groove body 32 and the first mounting groove 10 which are close to each other is α and α satisfies: alpha is more than or equal to 0 degree and less than or equal to 75 degrees. For example, in some particular embodiments, α can be 10 °, 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, and so forth. A is too large, which affects the extension of the second slot 32 in the radial direction of the rotor core 70, and further affects the extension of the magnetic bridge 71 in the radial direction of the rotor core 70, and reduces the ability of the first air gap slot 30 to reduce the magnetic flux leakage. Within the above size range, the first air gap groove 30 has a good ability to reduce leakage flux.
It should be noted that, when α is 0 °, the groove wall surfaces of the second groove body 32 and the first installation groove 10 which are close to each other are arranged in parallel, and a rotor core 70 portion is provided between the two planes, in other words, the side portion of the first installation groove 10 is not communicated with the second groove body 32, so as to ensure the magnetic path stability and the installation stability of the first permanent magnet 50 in the first installation groove 10.
In some embodiments of the present invention, as shown in fig. 4 and 5, an angle α of the groove wall surfaces of the second groove body 32 and the first mounting groove 10 that are close to each other, a length m of the first permanent magnet 50 that extends in the radial direction of the rotor core 70, and a dimension L of the groove wall surface of the second groove body 32 that is close to the first permanent magnet 50 that extends in the radial direction of the rotor core 70 satisfy: l multiplied by cos alpha is less than or equal to m/3. Therefore, the first air gap groove 30 is prevented from being too long in length extending along the radial direction of the rotor core 70 to affect the permanent magnet flux linkage, which is beneficial to improving the electromagnetic torque of the motor.
In some embodiments of the present invention, referring to fig. 4, the angle between two groove wall surfaces of the second groove body 32 facing each other in the circumferential direction of the rotor core 70 is β, the number of poles of the rotor 100 is K, wherein,
thus, the two second groove bodies 32 located at the two circumferential sides of the first mounting groove 10 have an included angle between two groove wall surfaces far away from each other
The applicant has found that, when the structures of the two second groove bodies 32 satisfy the above conditions, it is possible to significantly reduce stress concentration at the outer magnetic bridges located at the radial outer sides of the first mounting groove 10 along the rotor core 70, and to significantly improve the structural strength of the rotor core 70.
According to some embodiments of the present invention, as shown in fig. 1-2 and 4-5, the rotor core 70 is further provided with a plurality of second air-gap slots 40, the second air-gap slots 40 are located between two adjacent first air-gap slots 30, and a portion of the rotor core 70 between the second air-gap slots 40 and the first air-gap slots 30 is formed as a magnetic bridge 71, so that by providing the second air-gap slots 40, an extension thickness of the magnetic bridge 71 along a circumferential direction of the rotor core 70 is reduced, structural strength of the rotor core 70 is improved, and dual requirements of reducing magnetic leakage and ensuring the structural strength are met.
As shown in fig. 1 and 4, in the embodiment in which the second air-gap slots 40 are provided, the rotor core 70 portion between the first air-gap slot 30 and the adjacent second air-gap slot 40 is formed as the magnetic bridge 71, and in some embodiments, the slot wall surfaces of the first air-gap slot 30 and the adjacent second air-gap slot 40 which are close to each other are parallel to each other and have a pitch p. That is to say, the thickness of the magnetic bridges 71 is p, and the thickness of the magnetic bridges 71 is equal everywhere in the radial direction of the rotor core 70, so that on one hand, the structure of the rotor core 70 is simple and easy to process, and on the other hand, the effect of reducing leakage flux of the magnetic bridges 71 with the same thickness is better, which is beneficial to improving the electromagnetic torque of the motor. For example, in the example shown in fig. 4, the groove wall surfaces of the second groove body 32 and the adjacent second air-gap groove 40 close to each other are parallel to each other so that the thickness of the magnetic bridge 71 is kept constant.
In the embodiment provided with the second air-gap slot 40, referring to fig. 1 and 4, the slot wall surface of the second air-gap slot 40 close to the center of the rotor core 70 is the second inner wall surface 41, and the second inner wall surface 41 is a plane and extends along the tangential direction of the rotor core 70, and it can be understood that the tangential direction of the rotor core 70 here refers to the tangential direction of the rotor core 70 passing through the center point of the second inner wall surface 41. The first air gap groove 30 is a first inner wall surface 33 which is a groove wall surface away from the first permanent magnet 50 in the radial direction of the rotor core 70, and the first inner wall surface 33 is a plane and extends in the tangential direction of the rotor core 70, and it is understood that the tangential direction of the rotor core 70 here refers to the tangential direction of the rotor core 70 passing through the center point of the first inner wall surface 33. The first and second air gap grooves 30 and 40 have a simple structure and are easy to machine.
Also, the second inner wall surface 41 and the first inner wall surface 33 are both tangent to the same virtual circle (for example, a circle indicated by a broken line in fig. 1 and 4), in other words, the distance between the first air-gap groove 30 and the shaft hole of the rotor core 70 is equal to the distance between the second air-gap groove 40 and the shaft hole of the rotor core 70. The applicant found that if the distance between the first air gap groove 30 and the shaft hole of the rotor core 70 is greater than the distance between the second air gap groove 40 and the shaft hole of the rotor core 70, the extending lengths of the two side surfaces of the magnetic bridge 71 in the circumferential direction of the rotor core 70 in the radial direction of the rotor core 70 are unequal, which not only does not improve the magnetic flux leakage reducing capability of the magnetic bridge 71, but also reduces the structural strength of the rotor core 70; on the other hand, if the distance between the first air gap groove 30 and the shaft hole of the rotor core 70 is smaller than the distance between the second air gap groove 40 and the shaft hole of the rotor core 70, the structural strength of the rotor core 70 is also reduced without increasing the magnetic flux leakage reduction capability of the magnetic bridge 71. Therefore, when both the second inner wall surface 41 and the first inner wall surface 33 are tangent to the same virtual circle, the structural strength of the rotor core 70 is ensured while the requirement of reducing the magnetic flux leakage is satisfied.
In the embodiment where the first air gap groove 30 includes the first groove body 31 and the second groove body 32, as shown in fig. 4 and 5, the groove wall surface of the second air gap groove 40 away from the center of the rotor core 70 is the second outer wall surface 42, and the second outer wall surface 42 is a plane and extends in the tangential direction of the rotor core 70, it is understood that the tangential direction of the rotor core 70 herein refers to the tangential direction of the rotor core 70 passing through the center point of the second outer wall surface 42. A groove wall surface of the second groove body 32 that is distant from the center of the rotor core 70 in the radial direction of the rotor core 70 is the first outer wall surface 34.
In some embodiments, as shown in fig. 4 and 5, the first outer wall surface 34 is a plane, and at this time, the second outer wall surface 42 and the two first outer wall surfaces 34 located between two adjacent first mounting grooves 10, and the second outer wall surface 42 is coplanar with the first outer wall surfaces 34 (for example, a plane perpendicular to the paper surface as shown by a line h-h in fig. 4), so that the two side surfaces of the magnetic bridge 71 in the circumferential direction of the rotor core 70 are closer to each other along the radial extension length of the rotor core 70, thereby satisfying the requirement of reducing magnetic leakage and ensuring the structural strength of the rotor core 70. Furthermore, the planar design makes the first outer wall surface 34 easier to machine.
In the embodiment where the first inner wall surface 33, the first outer wall surface 34, the second inner wall surface 41, and the second outer wall surface 42 are flat surfaces, the junctions of the first inner wall surface 33, the first outer wall surface 34, the second inner wall surface 41, and the second outer wall surface 42 with the groove wall surfaces adjacent in the circumferential direction of the rotor core 70 may be provided with chamfers, such as circular chamfers, which is also within the scope of the present invention. In other words, the junction of the wall surfaces of the first air gap groove 30 and the second air gap groove 40 may be chamfered, so as to reduce stress concentration around the first air gap groove 30 and the second air gap groove 40, which is beneficial to improving the structural stability of the rotor core 70.
In other embodiments, the first outer wall surface 34 is an arc surface, at this time, the second outer wall surface 42 and the two first outer wall surfaces 34 located between two adjacent first mounting grooves 10 are tangent to the first outer wall surface 34 at a plane where the second outer wall surface 42 is located, and similarly, the radial extension lengths of the two side surfaces of the magnetic bridge 71 in the circumferential direction of the rotor core 70 are closer to each other along the rotor core 70, so that the requirement of reducing magnetic leakage is met, and the structural strength of the rotor core 70 is ensured. Moreover, the cambered surface design can reduce stress concentration around the second groove body 32, which is beneficial to improving the structural strength of the rotor core 70.
In some embodiments, as shown in fig. 1 and 4, a thickness p of the magnetic bridge 71, a number K of poles of the rotor 100, an outer diameter D of the rotor core 70, and a length m of the first permanent magnet 50 extending in a radial direction of the rotor core 70 may satisfy:
the thickness p of the magnetic bridge 71 is too large, the magnetic leakage of the motor is large, the electromagnetic torque of the motor is influenced, and the thickness p of the magnetic bridge 71 is too small, so that the structural stress requirement of the motor rotor at a high speed cannot be met. Within the above parameter range, the thickness p of the magnetic bridge 71 satisfies both the requirements of reducing the magnetic flux leakage and the high-speed structural stress.
In some embodiments, as shown with reference to fig. 1 and 4, two slot wall surfaces of the second air-gap slot 40 facing each other in the circumferential direction of the rotor core 70 are parallel to each other at a distance q, that is, the width of the second air-gap slot 40 is q, and the width q satisfies:
if the width of the second air gap groove 40 is too wide, the structural stress inside the first air gap groove 30 is too large, and the first air gap groove 30 is not easy to machine, and if the width of the second air gap groove 40 is small, the structural stress around the second air gap groove 40 is too large. Therefore, within the above parameter range, it is possible to prevent excessive structural stress around the first air gap groove 30 and the second air gap groove 40, which is advantageous in improving the structural strength of the rotor core 70, and also, the first air gap groove 30 is easier to machine.
In some embodiments, the first permanent magnet 50 and the second permanent magnet 60 have rectangular cross sections along the radial direction of the rotor core 70, so that the structure is simple, the processing technology is simple, and the processing difficulty of the first mounting groove 10 and the second mounting groove 20 is reduced; or the sections of the first and second permanent magnets 50 and 60 in the radial direction of the rotor core 70 may extend in an arc shape to increase the size of the first and second permanent magnets 50 and 60 and improve magnetic characteristics.
In some embodiments, the second permanent magnet 60 may be radially magnetized to provide a better sinusoidal air gap flux density for the machine, or the second permanent magnet 60 may be parallel magnetized to provide a higher magnitude air gap flux density for the machine.
In some embodiments of the present invention, as shown in fig. 3, the number of poles of the rotor 100 and the number of the first permanent magnets 50 are equal, the number of the second permanent magnets 60 is twice that of the first permanent magnets 50, each magnetic pole shares one first permanent magnet 50 with one magnetic pole on one side in the circumferential direction thereof and shares another first permanent magnet 50 with another magnetic pole on the other side in the circumferential direction thereof, and one first permanent magnet 50 and two second permanent magnets 60 are located below each magnetic pole of the rotor 100. The number of required mounting grooves is reduced, so that the structure of the rotor 100 is simpler and the structural strength is higher.
In some embodiments of the present invention, the number of poles K of the rotor 100 is even and K is equal to or greater than 4 and equal to or less than 12, that is, the rotor 100 may be four poles, six poles, eight poles, ten poles or ten poles, so that the rotor 100 can meet the use requirements of more motors, and the size design of the first permanent magnet 50 and the second permanent magnet 60 may be more reasonable, which is beneficial to improving the electromagnetic torque.
At present, for the rotor that new energy automobile used, in order to improve the salient pole rate, adopt the double-deck permanent magnet structure of following the radial distribution of rotor usually, such as V + V structure, V + U structure etc. the magnet steel number under each magnetic pole of this kind of structure is 4 or more, two kinds of size's magnet steel need be processed at least during processing magnet steel, need the mould more than two sets, during the installation, use common 48 groove 8 utmost point motors as an example, if 6 sections are divided to the axial, 192 magnet steels need be processed and installed to a motor.
In the rotor 100 of the present invention, the number of the magnetic steels under each magnetic pole is 3, and at most two sizes of magnetic steels need to be processed, or in some embodiments, the first permanent magnet 50 and the second permanent magnet 60 have the same size, and only one size of magnetic steel needs to be processed. Therefore, the same motor with 48 slots, 8 poles and 6 segments needs 144 magnetic steels for processing and mounting. The number of required magnetic steels is obviously reduced, the number of dies is reduced, and the processing of the permanent magnet and the rotor core 70 punching sheet and the manufacturing and installation of the motor are simplified.
It should be noted that the above technical solutions regarding the structure, the arrangement position, the size and the like of the first air gap slot 30 and/or the second air gap slot 40 include but are not limited to the application of the cross-sectional area ratio of the first permanent magnet 50 and the second permanent magnet 60 to satisfy the requirement
The technical scheme of (1). That is, in the embodiment provided with the first air gap groove 30 and/or the second air gap groove 40, the cross-sectional area ratio of the first permanent magnet 50 and the second permanent magnet 60 may satisfy
Or may not satisfy
This all can bring the beneficial technological effect such as reducing magnetic leakage for this application. Wherein the rotor 100 satisfies both
When at least one of the first air gap groove 30 and the second air gap groove 40 is arranged, magnetic leakage is reduced, electromagnetic torque is improved, the permanent magnet torque and the reluctance torque are matched optimally, and better technical effects are achieved.
The driving motor according to an embodiment of the present invention includes the rotor 100 of the motor according to an embodiment of the present invention. Since the rotor 100 of the motor according to the embodiment of the present invention has the above-described advantageous technical effects, the driving motor according to the embodiment of the present invention forms the first permanent magnet 50 as a spoke type permanent magnet extending in a radial direction of the rotor core 70, and the two second permanent magnets 60 as a shape of a spoke type permanent magnet, by simultaneously providing the first permanent magnet 50 and the second permanent magnets 60The radial permanent magnet and the V-shaped permanent magnet are combined to make the rotor 100 have the advantages of small magnetic leakage, good demagnetization resistance, large air gap flux density and the like, and the sectional area ratio of the first permanent magnet 50 to the second permanent magnet 60 satisfies the requirement
The electromagnetic torque of the composite structure is improved, the optimal matching of the permanent magnet torque and the reluctance torque is realized, and the torque performance and the weak magnetic performance of the motor are good.
When the rotor 100 is used for driving a motor, the torque of the driving motor is large at low speed, the climbing capability of a vehicle is strong, the starting and accelerating capabilities are strong, the high-speed performance of the driving motor is good, the highest rotating speed is large, the size and the weight of the driving motor can be reduced, the space is saved, and the weight of the vehicle is reduced. The driving motor has wide speed regulation range and can meet the requirements of vehicles under different road conditions.
A vehicle according to an embodiment of the present invention includes a drive motor according to an embodiment of the present invention. Since the driving motor according to the embodiment of the present invention has the above-mentioned advantageous technical effects, the vehicle according to the embodiment of the present invention forms the first permanent magnet 50 as a radial permanent magnet extending in the radial direction of the rotor core 70 by arranging the first permanent magnet 50 and the second permanent magnets 60 at the same time, forms the two second permanent magnets 60 as V-shaped permanent magnets, and performs a composite design of the radial permanent magnet and the V-shaped permanent magnets to provide the rotor 100 with advantages of small magnetic leakage, good demagnetization resistance, large air gap flux density, and the like, and satisfies the sectional area ratio of the first permanent magnet 50 and the second permanent magnet 60
The electromagnetic torque of the composite structure is improved, the optimal matching of the permanent magnet torque and the reluctance torque is realized, and the torque performance and the weak magnetic performance of the motor are good.
When the driving motor is used for a vehicle, the driving motor can realize large torque when the vehicle is at a low speed, the climbing capability of the vehicle is strong, the starting and accelerating capabilities are strong, the high-speed performance of the driving motor is good, the highest rotating speed is large, the size and the weight of the driving motor can be reduced, the space is saved, and the weight of the vehicle is reduced. The driving motor has wide speed regulation range and can meet the requirements of vehicles under different road conditions.
Other constructions and operations of the vehicle, the driving motor, and the rotor 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (23)
1. A rotor of an electric machine, the rotor comprising:
a rotor core;
a plurality of first permanent magnets and a plurality of second permanent magnets, the first permanent magnets and the second permanent magnets being mounted on the rotor core, the plurality of first permanent magnets extending in a radial direction of the rotor core and being distributed at intervals in a circumferential direction of the rotor core, two second permanent magnets being disposed between two adjacent first permanent magnets, ends of the two second permanent magnets located between two adjacent first permanent magnets, which are close to a center of the rotor core, being close to each other and ends of the two second permanent magnets located between two adjacent first permanent magnets, which are far from the center of the rotor core, being far from each other, a cross-sectional area of each first permanent magnet perpendicular to an axial direction of the rotor core being S1, and a cross-sectional area of each second permanent magnet perpendicular to the axial direction of the rotor core being S2, wherein,
2. the rotor of an electric machine according to claim 1, wherein the S1 and the S2 further satisfy:
3. the rotor of an electric motor according to claim 1, wherein an outer diameter of the rotor core is D and an inner diameter thereof is D, a length between one end of the second permanent magnet, which is away from a center of the rotor core, and one end of the second permanent magnet, which is close to the center of the rotor core, is a, a width of the second permanent magnet is b, and an angle formed by center lines of the two second permanent magnets, which are located on both sides of the first permanent magnet and extend in a length direction, is θ,
4. the rotor of an electric motor according to claim 1, wherein the number of poles of the rotor is K, the outer diameter of the rotor core is D, the length between one end of the second permanent magnet, which is away from the center of the rotor core, and one end of the second permanent magnet, which is close to the center of the rotor core, is a, and an angle formed by center lines of the two second permanent magnets, which are located on both sides of the first permanent magnet and extend in the length direction, is θ,
5. the rotor of an electric machine according to claim 1, wherein the number of poles of the rotor is K, the rotor core has an outer diameter D and an inner diameter D,
the first permanent magnet extends in a radial direction of the rotor core by a length m,
a length between one end of the second permanent magnet, which is far from the center of the rotor core, and one end of the second permanent magnet, which is close to the center of the rotor core, is a,
6. the rotor of an electric machine according to claim 1, characterized in that the width of the first permanent magnet in the tangential direction of the rotor core is n, and the width of the second permanent magnet in the radial direction of the rotor core is b, wherein,
n≥b。
7. the rotor of an electric machine according to claim 6, wherein the rotor core has an outer diameter D, and wherein n and b further satisfy:
8. the rotor of an electric machine according to claim 1, characterized in that the rotor core is provided with a plurality of first air-gap slots, at least a part of each of which is located on a side of the first permanent magnet close to a center of the rotor core.
9. The rotor of an electric machine according to claim 8, wherein the rotor core is provided with a first mounting groove for mounting the first permanent magnet, the first mounting groove communicating with the first air gap groove on a side of the first mounting groove near a center of the rotor core.
10. The rotor of an electric machine of claim 9, wherein the first air gap slot comprises:
the first groove body is positioned on one side, close to the center of the rotor core, of the first permanent magnet, and the groove wall surface, far away from the first permanent magnet, of the first groove body in the radial direction of the rotor core is a plane;
two second cell bodies, two the second cell body is located respectively first cell body is followed the both ends of rotor core's circumference, just the second cell body with first cell body intercommunication, two the second cell body is followed rotor core's radial outer end is located respectively first permanent magnet is followed the both sides of rotor core's circumference, two the second cell body is in two groove wall faces that keep away from each other in rotor core's circumference are the plane.
11. The rotor of an electric motor according to claim 10, wherein an included angle between the second groove body and a groove wall surface of the first mounting groove, which is close to each other, is α and α satisfies:
0°≤α≤75°。
12. the rotor of an electric motor according to claim 10, wherein an angle between the second slot body and a slot wall surface of the first mounting slot that is close to each other is α, a length of the first permanent magnet that extends in the radial direction of the rotor core is m, and a size of the slot wall surface of the second slot body that is close to the first permanent magnet that extends in the radial direction of the rotor core is L, wherein,
L×cosα≤m/3。
13. the rotor of an electric machine according to claim 11 or 12, wherein an angle of an included angle of two groove wall surfaces of the second groove body facing each other in a circumferential direction of the rotor core is β, a pole number of the rotor is K, wherein,
14. the rotor of an electric machine according to claim 9, wherein the rotor core is further provided with a plurality of second air-gap slots provided between adjacent two of the first air-gap slots.
15. The rotor of an electric machine according to claim 10, wherein the rotor core is further provided with a plurality of second air-gap slots provided between adjacent two of the first air-gap slots.
16. The rotor of an electric machine according to claim 14 or 15, wherein a slot wall surface of the second air gap slot that is close to the center of the rotor core is a second inner wall surface, the second inner wall surface is a plane and extends in a tangential direction of the rotor core, a slot wall surface of the first air gap slot that is away from the first permanent magnet in a radial direction of the rotor core is a first inner wall surface, and the second inner wall surface and the first inner wall surface are both tangent to a same virtual circle.
17. The rotor of an electric machine of claim 15, wherein the second slot body is parallel to a slot wall surface of the adjacent second air gap slot that is close to each other.
18. The rotor of an electric machine according to claim 15, wherein a slot wall surface of the second air gap slot that is away from the center of the rotor core is a second outer wall surface that is a plane and extends in a tangential direction of the rotor core, a slot wall surface of the second slot body that is away from the center of the rotor core in a radial direction of the rotor core is a first outer wall surface,
the first outer wall surface is a plane, and the second outer wall surface positioned between two adjacent first mounting grooves is coplanar with the first outer wall surface, or,
the first outer wall surface is an arc surface, and a plane where the second outer wall surface is located between every two adjacent first mounting grooves is tangent to the first outer wall surface.
19. The rotor of an electric machine according to claim 14 or 15, wherein a magnetic bridge is formed between the first air-gap slot and the adjacent second air-gap slot, the magnetic bridge having a thickness p extending in a circumferential direction of the rotor core, the number of poles of the rotor being K, an outer diameter of the rotor core being D, the first permanent magnet having a length m extending in a radial direction of the rotor core,
20. the rotor of an electric machine according to claim 19, wherein the second air gap slot is parallel to each other along two slot wall surfaces opposed to each other in a circumferential direction of the rotor core at a pitch q, wherein,
21. the rotor of an electric machine according to any of claims 1-12, characterized in that the number of poles of the rotor, the number of first permanent magnets is equal, the number of second permanent magnets is twice the number of first permanent magnets, the number of poles of the rotor is K, K is an even number and 4 ≤ K ≤ 12.
22. A drive motor, characterized by comprising a rotor of a motor according to any one of claims 1-21.
23. A vehicle characterized by comprising the drive motor according to claim 22.
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| WO2023123536A1 (en) * | 2021-12-31 | 2023-07-06 | 江苏大学 | High-performance variable-operating-condition controllable-magnetic-field permanent magnet motor, magnetic flux guide design method therefor, and magnetic flux leakage regulation and control method therefor |
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| CN210724356U (en) * | 2019-09-30 | 2020-06-09 | 安徽威灵汽车部件有限公司 | Rotor of motor, driving motor and vehicle |
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