CN114665630A - Motor rotor, motor, power assembly and electric vehicle - Google Patents
Motor rotor, motor, power assembly and electric vehicle Download PDFInfo
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- CN114665630A CN114665630A CN202210258038.3A CN202210258038A CN114665630A CN 114665630 A CN114665630 A CN 114665630A CN 202210258038 A CN202210258038 A CN 202210258038A CN 114665630 A CN114665630 A CN 114665630A
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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
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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
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
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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
- H02K1/12—Stationary parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/006—Structural association of a motor or generator with the drive train of a motor vehicle
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
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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 application provides a motor rotor, motor, power assembly and electric motor car. The motor rotor includes a rotor core and n pole pairs. The n pole pairs include 2n poles arranged around the circumference of the rotor core. Each magnetic pole is symmetrical along the central line of the magnetic pole of the motor rotor. Each magnetic pole comprises at least one permanent magnet, permanent magnet grooves which are arranged in one-to-one correspondence with the permanent magnets, and a plurality of surface arc repair grooves which are arranged in correspondence with the permanent magnets. The permanent magnet slot is arranged on the rotor core, and the permanent magnet is arranged in the permanent magnet slot. The surface arc trimming is arranged on the peripheral side surface of the rotor core. The 2n magnetic poles have m kinds of characteristic magnetic poles. The permanent magnet parameters of any two characteristic magnetic poles are the same, and the permanent magnet slot parameters and the surface arc trimming parameters are different. Two adjacent magnetic poles are different characteristic magnetic poles. The motor rotor can reduce the noise of the motor and improve the working effect of the motor, thereby reducing the noise generated in the running process of the electric vehicle and improving the driving comfort of the electric vehicle.
Description
Technical Field
The application relates to the technical field of mechanical equipment, in particular to a motor rotor, a motor, a power assembly and an electric vehicle.
Background
Noise (Noise), Vibration (Vibration), Harshness (NVH performance index) are important indexes for measuring the driving comfort of the automobile, and can directly and comprehensively reflect the driving feeling of the automobile to users. During the operation of an electric vehicle, noise mainly originates from the electric motor. As a key execution component of the electric vehicle, the motor generates noise, which not only affects the driving comfort of users, but also causes loss and shortens the service life of the motor.
Commonly used motors for electric vehicles include permanent magnet motors. The permanent magnet motor comprises a stator and a rotor which are coaxially arranged, wherein the rotor comprises a rotor core and magnetic poles arranged on the rotor core. During operation of the machine, the setting of the parameters of the magnetic poles generally has a relatively important influence on the noise generated by the machine.
Disclosure of Invention
The application provides a motor rotor, motor, power assembly and electric motor car to reduce the noise that motor rotor produced, improve the working effect of motor, thereby reduce the noise that the electric motor car produced in the operation process, improve the travelling comfort of driving of electric motor car.
In a first aspect, the present application provides an electric machine rotor. The motor rotor may include a rotor core and n pole pairs, where n ≧ 3. The n pole pairs specifically include 2n poles arranged around the circumference of the rotor core. In the present application, each magnetic pole is symmetrical along the center line of the magnetic pole of the motor rotor. For the above magnetic poles, each magnetic pole may include at least one permanent magnet, permanent magnet slots disposed in one-to-one correspondence with the permanent magnet, and a plurality of surface-modified arcs disposed in correspondence with the permanent magnet. Specifically, the permanent magnet slots are disposed in the rotor core. The permanent magnet is arranged in the permanent magnet groove. The surface arc repair is arranged on the peripheral side surface of the rotor core. The 2n magnetic poles have m kinds of characteristic magnetic poles, wherein m is more than or equal to 2. The permanent magnet parameters of any two characteristic magnetic poles are the same, and the permanent magnet slot parameters and the surface arc trimming parameters are different.
In the motor rotor, two adjacent magnetic poles are different characteristic magnetic poles. That is, the permanent magnets of two adjacent magnetic poles are the same, so that the manufacturing and assembly of the permanent magnets can be simplified; the permanent magnet slot parameters and the surface arc trimming parameters of two adjacent magnetic poles are different, and the optimized parameters of the magnetic poles can be increased, so that the sinusoidal air gap flux density waveform is facilitated, the torque pulsation is reduced, the noise generated by a motor rotor is reduced, and the working effect of the motor is improved.
The m kinds of characteristic magnetic poles and the 2n magnetic poles can specifically satisfy: m is a common divisor of 2 n. For example, when the motor rotor includes 6 poles, the kinds of characteristic poles may include 2, 3, or 6. For another example, when the motor rotor includes 10 poles, the kinds of the characteristic poles may include 2, 5, or 10.
The motor rotor can be in an axial segmented structure or a segmented oblique pole structure. In some embodiments, the rotor of the electric machine may be an axially segmented structure. In particular, the rotor core may comprise x rotor core segments, where x is an integer multiple of m. Each rotor core segment is provided with n magnetic pole pairs, and the rotation angle between two adjacent rotor core segments can be 1 magnetic pole angle. In other technical schemes, the motor rotor can also be in a segmented oblique pole structure. Specifically, the rotor core includes x rotor core segments, where x is an integer multiple of m. Each rotor core section is provided with n magnetic pole pairs, and the rotation angle between two adjacent rotor core sections is the sum of 1 magnetic pole angle and an oblique polar angle. In the motor rotor, since adjacent two magnetic poles are different characteristic magnetic poles, an unbalanced magnetic pulling force may be generated when the motor rotor rotates. The motor rotor adopts an axial segmented structure or a segmented oblique pole structure, so that unbalanced magnetic pull force can be eliminated, and further, low-order noise is eliminated.
The setting of the permanent magnet parameters, the permanent magnet slot parameters, and the surface arc repair parameters is not particularly limited when setting the magnetic poles. For example, the permanent magnet parameters may include the size, material, position, or pole arc angle of the permanent magnet. The permanent magnet slot parameters may include width, length, included angle, arc repair radius, magnetic bridge thickness or magnetic bridge length of the permanent magnet slot. Therefore, for two adjacent magnetic poles, at least one parameter of the width, the length, the included angle, the arc trimming radius, the magnetic bridge thickness or the magnetic bridge length of the permanent magnet groove is different. The surface arc trimming parameters may include the angle, depth, width, radius or number of surface arc trims. Thus, at least one of the angle, depth, width, radius or number of surface reliefs is different for two adjacent poles.
In order to further increase the optimizable parameters of the pole, the number of said surface reliefs may be greater than or equal to 6.
In the present application, the arrangement of the permanent magnets is not particularly limited. For example, each pole may include one permanent magnet arranged in a straight line. Alternatively, each magnetic pole may also include at least one pair of permanent magnets arranged in a V-shape. Alternatively, each magnetic pole may include a pair of permanent magnets arranged in a V-shape, and one permanent magnet arranged in a straight shape.
In addition, the specific type of the motor rotor of the present application is not limited, and may be, for example, an internal rotor or a permanent magnet-assisted reluctance rotor.
In a second aspect, the present application provides an electric machine. The electric machine comprises a machine stator and the machine rotor of the first aspect. Specifically, the motor stator and the motor rotor are coaxially sleeved. In the motor rotor of the motor, two adjacent magnetic poles are different characteristic magnetic poles, and the optimized parameters of the magnetic poles are increased. Therefore, in the running process of the motor, the air gap flux density waveform can be sine, and the torque pulsation is reduced, so that the noise generated by the motor rotor can be reduced, and the working effect of the motor is improved.
In a third aspect, the present application provides a powertrain. A powertrain comprises a gearbox, a driveshaft and the electric machine of the second aspect. The gearbox can be in transmission connection with the motor through a transmission shaft. In the running process of a motor of the power assembly, the air gap flux density waveform can be sinusoidal, and the torque pulsation is reduced, so that the noise generated by a motor rotor can be reduced, the working effect of the motor is improved, and the performance of the power assembly can be improved.
In a fourth aspect, the present application provides an electric vehicle. The electric vehicle includes a vehicle body frame and the power train of the third aspect. The power assembly is arranged on the vehicle body frame. The motor of the electric vehicle generates less noise in the running process, so that the driving comfort of the electric vehicle can be improved.
Drawings
FIG. 1 is a schematic structural diagram of an electric vehicle according to an embodiment of the present application;
fig. 2 is a schematic structural view of the motor in the embodiment of the present application;
FIG. 3 is a schematic view of a structure of a rotor of the motor according to the embodiment of the present application;
FIG. 4 is an enlarged structural view of two adjacent magnetic poles in FIG. 3;
FIG. 5 is a schematic view of another structure of a magnetic pole in the embodiment of the present application;
FIG. 6 is a schematic view of another structure of a magnetic pole in the embodiment of the present application;
FIG. 7 is a schematic view of another structure of a magnetic pole in the embodiment of the present application;
FIG. 8 is a schematic view of another structure of a rotor of the motor in the embodiment of the present application;
fig. 9 is another structural schematic diagram of the rotor of the motor in the embodiment of the present application.
Reference numerals:
10-an electric vehicle;
11-a body frame;
12-a powertrain;
13-a transmission;
14-a wheel;
20-a motor;
21-a motor stator;
22-a motor rotor;
23-a rotor core;
231-rotor core segment;
24-magnetic pole;
241-a permanent magnet;
242-permanent magnet slots;
243-surface arc trimming.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in another embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
The terminology used in the following examples is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of this application and the appended claims, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, such as "one or more", unless the context clearly indicates otherwise.
With the importance of people on energy shortage and automobile emission, electric vehicles using batteries as power energy are applied to more and more scenes. The motor is used as a power component of the electric vehicle, and besides playing an important role in the power performance of the electric vehicle, the noise of the motor also influences the overall quality of the electric vehicle. Since noise of the motor is mostly electromagnetic noise, reducing electromagnetic noise becomes an important factor for realizing noise reduction of the motor. At present, the reduction of electromagnetic noise of an electric machine is mainly achieved by reducing the noise excitation of the electric machine, that is, by reducing the torque ripple of the electric machine.
The following description will be given taking a permanent magnet motor as an example. The permanent magnet motor is a motor which generates a motor magnetic field by permanent magnets, and the rotor functional components of the permanent magnet motor mainly comprise a rotor iron core and the permanent magnets. Currently, most permanent magnet motors employ a uniform air gap structure. The air gap magnetic field contains a large number of harmonics. When the arrangement of the permanent magnet is not reasonable, harmonic waves in the air gap flux density are aggravated, so that the harmonic content of electromotive force generated by the permanent magnet motor is large.
For the built-in rotor permanent magnet motor, the torque fluctuation mainly comprises cogging torque and ripple torque. Cogging torque is the torque generated by the periodic interaction of the rotor magnetic field with the motor teeth and can be reduced by segmented pole-skewing, fractional slot winding, slot opening reduction, and the like. Ripple torque is the torque produced by air gap flux density harmonics. As the rotational speed of the rotor functional part increases, the high frequency component of the air gap flux density waveform also increases, thereby generating high frequency noise. With the increase of the harmonic wave of the air gap magnetic field, the harmonic magnetic field and the harmonic current can generate extra torque fluctuation, so that the vibration and the noise of the permanent magnet motor can be increased, the harmonic iron loss, the harmonic current, the harmonic copper loss and the like of a rotor can be increased, and the further improvement of the efficiency of the permanent magnet motor is influenced. Therefore, in order to reduce the influence of the magnetic wave magnetic field in the no-load air gap magnetic field on the performance of the motor, the parameters of the rotor need to be reasonably designed to weaken the harmonic magnetic field of the air gap magnetic field, so that the torque fluctuation is reduced.
The application provides a motor rotor, motor, power assembly and electric motor car to reduce the noise that motor rotor produced, improve the working effect of motor, thereby reduce the noise that the electric motor car produced in the operation process, improve the travelling comfort of driving of electric motor car.
Fig. 1 is a schematic structural diagram of an electric vehicle according to an embodiment of the present application. As shown in fig. 1, the electric vehicle 10 may include a vehicle body frame 11 and a power train 12, wherein the power train 12 is disposed on the vehicle body frame 11. In an embodiment of the present application, the electric vehicle 10 may further include a transmission 13 and wheels 14. The wheels 14 are in transmission connection with the powertrain 12 through the transmission 13.
Specifically, the powertrain 12 may include an electric motor, a driveshaft, and a gearbox. The gearbox can be in transmission connection with the motor through a transmission shaft, and the wheels 14 can be in transmission connection with the gearbox through the transmission device 13. The driving force output by the motor can be transmitted to the gearbox through the transmission shaft. The transmission can change the driving force output by the motor according to different running conditions of the electric vehicle 10, so as to drive the wheels 14 to rotate at different speeds, thereby realizing variable-speed running of the electric vehicle 10.
Fig. 2 is a schematic structural diagram of a motor according to an embodiment of the present application. As shown in fig. 2, the motor 20 includes a motor stator 21 and a motor rotor 22, wherein the motor stator 21 and the motor rotor 22 are coaxially sleeved. When the motor rotor 22 rotates relative to the motor stator 21, a magnetic field may be generated, thereby forming a driving force.
In an embodiment of the present application, the motor 20 may be an internal rotor or a permanent magnet assisted reluctance rotor. In addition, the motor 20 may be applied to not only the electric vehicle 10, but also mechanical devices in other fields, such as a washing machine, a refrigerator, a blower, a water pump, etc., without limitation.
Fig. 3 is a schematic structural diagram of a rotor of an electric machine according to an embodiment of the present application. As shown in fig. 3, specifically, the motor rotor 22 includes a rotor core 23 and n magnetic pole pairs, where n may be an integer greater than or equal to 3. These pole pairs include 2n poles 24, i.e., each pole pair includes 2 poles 24, each pole 24 being symmetric along a pole centerline (d-axis as shown in fig. 3) of the motor rotor 22.
Fig. 4 is an enlarged structural diagram of two adjacent magnetic poles in fig. 3. As shown in fig. 4, each magnetic pole 24 includes at least one permanent magnet 241 and permanent magnet slots 242 disposed in one-to-one correspondence with the permanent magnets 241, the permanent magnets 241 being disposed in the permanent magnet slots 242. The rotor core 23 may be formed by laminating a plurality of rotor sheets, and each rotor sheet has a slot. When the rotor punching sheets are laminated to form the rotor core 23, the slot holes form permanent magnet slots 242, and the permanent magnet slots 242 are disposed in the rotor core 23. In addition, each magnetic pole 24 further includes a plurality of surface-modified arcs 243 provided corresponding to the permanent magnets 241, the surface-modified arcs 243 being provided on the circumferential side surface of the rotor core 23.
The 2n magnetic poles 24 may have m kinds of characteristic magnetic poles, where m is an integer greater than or equal to 2. In embodiments of the present application, the parameters of the characteristic magnetic pole may specifically include permanent magnet parameters, permanent magnet slot parameters, and surface arc repair parameters. Any two characteristic magnetic poles satisfy: the permanent magnet parameters of the two characteristic magnetic poles are the same, and the permanent magnet slot parameters and the surface arc trimming parameters are different.
The above-mentioned 2n magnetic poles 24 are arranged around the circumference of the rotor core 23, and the adjacent two magnetic poles 24 are different characteristic magnetic poles. That is, adjacent two poles 24 are not symmetrical along the quadrature axis (q-axis as shown in fig. 3) of the motor 20. The permanent magnet slot parameters and the surface arc repair parameters of two adjacent magnetic poles 24 are different, and the optimized parameters of the magnetic poles 24 can be increased, so that the sinusoidal air gap flux density waveform is facilitated, the torque pulsation is reduced, the noise generated by the motor rotor 22 is reduced, and the working effect of the motor 20 is improved.
In the above embodiment, the permanent magnets 241 of the motor rotor 22 are identical, so that not only the material of the permanent magnets 241 can be unified and the manufacturing process of the permanent magnets 241 can be simplified, but also the steps of the insertion and magnetizing processes of the permanent magnet slots 242 can be simplified. The permanent magnets 241 are identical in meaning that the permanent magnet parameters are identical. The permanent magnet parameters may include the size, material, position, or polar arc angle of the permanent magnet 241. Specifically, the permanent magnet 241 is generally in the shape of an arc bar, and the size thereof may include the length, width and height of the permanent magnet 241. The type of the permanent magnet 241 may be a sintered magnet or a bonded magnet, and may specifically be made of materials such as alnico, ferrite, neodymium iron boron, or samarium cobalt. The permanent magnets 241 may be distributed in the rotor core 23 in different manners, and may have a configuration such as "linear", "V-shaped", or "V + linear", for example. Therefore, the specific positions and the number of the permanent magnets 241 are different according to different distribution patterns of the permanent magnets 241. For example, the magnetic pole may particularly comprise 1, 2, 3 or 4 permanent magnets 241. The distribution of the permanent magnets 241 will be specifically described below.
In some embodiments of the present application, the magnetic pole 24 may include at least one pair of permanent magnets 241 arranged in a V-shape. As shown in fig. 3 and 4, in a particular embodiment, each pole 24 may include two pairs of permanent magnets 241 arranged in a double V-shape. The two pairs of permanent magnets 241 are arranged in a direction away from the rotor core 23, and the V-shaped opening formed by each pair of permanent magnets 241 is disposed toward the circumferential side surface of the rotor core 23. Fig. 5 is another structural diagram of a magnetic pole in the embodiment of the present application. In another specific embodiment, as shown in fig. 5, each pole 24 may include a pair of permanent magnets 241 arranged in a single V-shape. The V-shaped openings formed by the pair of permanent magnets 241 are provided toward the circumferential surface of the rotor core 23.
Fig. 6 is another structural diagram of a magnetic pole in the embodiment of the present application. In another specific embodiment, as shown in fig. 6, the magnetic pole 24 may include a pair of permanent magnets 241 arranged in a V-shape, and one permanent magnet 241 arranged in a straight shape. The V-shaped opening formed by the pair of permanent magnets 241 is provided toward the circumferential surface of the rotor core 23, and the permanent magnet 241 having a linear shape is provided on the side of the V-shaped opening, thereby forming a "V + linear" structure.
Fig. 7 is another structural diagram of a magnetic pole in the embodiment of the present application. In another specific embodiment, as shown in fig. 7, the magnetic pole 24 may include a permanent magnet 241 arranged in a straight line. In the motor rotor 22 of this embodiment, all the permanent magnets 241 are arranged around the circumference of the rotor core 23, and the magnetic poles of the permanent magnets 241 are aligned in the same direction. For example, the magnetic poles of the permanent magnet 241 may be arranged in the order of N-pole and S-pole, or may be arranged in the order of S-pole and N-pole, in a clockwise direction around the circumference of the rotor core 23. That is, in the adjacent two permanent magnets 241, the N pole of one permanent magnet 241 is adjacent to the S pole of the other permanent magnet 241.
The permanent magnet slot parameters may include the width, length, included angle, arc repair radius, magnetic bridge thickness, or magnetic bridge length of the permanent magnet slot 242. Specifically, for two adjacent magnetic poles 24, at least one parameter of the width, the length, the included angle, the arc trimming radius, the magnetic bridge thickness or the magnetic bridge length of the permanent magnet slot 242 is different. The resurfacing parameters may include an angle, a depth, a width, a radius, or a number of resurfacing 243. At least one of the angle, depth, width, radius or number of the surface modified arcs 243 of the adjacent two magnetic poles 24 is different. For example, in some embodiments of the present application, the number of surface reliefs 243 may be greater than or equal to 6 for each pole 24.
In the embodiment of the present application, the m kinds of characteristic magnetic poles and the 2n magnetic poles 24 may satisfy: m is a common divisor of 2 n. For example, in one particular embodiment, the motor rotor 22 includes 3 pole pairs, the 3 pole pairs including 6 poles 24. The 6 poles 24 may have 2, 3 or 6 characteristic poles. In another particular embodiment, the motor rotor 22 includes 5 pole pairs, the 5 pole pairs including 10 poles 24. The 10 poles 24 may have 2, 5 or 10 characteristic poles. The m-th characteristic magnetic poles are alternately arranged around the circumference of the rotor core 23 so that adjacent two magnetic poles 24 are different characteristic magnetic poles.
In embodiments of the present application, the motor rotor 22 may embody an axially segmented structure or a segmented skewed pole structure to eliminate unbalanced magnetic pull and low-order noise.
For example, in some embodiments of the present application, the motor rotor 22 may be a segmented, skewed pole structure. Specifically, rotor core 23 may include x rotor core segments, where x is an integer multiple of m. The x rotor core segments are coaxially arranged along the central axis direction of the rotor core 23. Wherein each rotor core segment is provided with n pole pairs. In assembling the rotor core 23, the rotation angle between adjacent two rotor core segments may be set to the sum of 1 magnetic pole angle and a skewed pole angle.
Fig. 8 is another structural schematic diagram of the rotor of the motor in the embodiment of the present application. In one particular embodiment, as shown in fig. 8, the motor rotor 22 is a segmented, skewed pole configuration. Specifically, the motor rotor 22 includes 3 pole pairs, i.e., 6 poles 24. In this embodiment, the pole angle is 60 °, and each pole 24 comprises two pairs of permanent magnets 241 arranged in a V-shape. The 6 poles 24 have 3 characteristic poles, shown as A, B, C in fig. 8. The above-mentioned 3 kinds of characteristic magnetic poles are arranged in turn in the clockwise direction according to A, B, C, A, B, C. The rotor core 23 includes 6 rotor core segments 231. The rotation angle between two adjacent rotor core segments 231 is the sum of the magnetic pole angle of 60 ° and the oblique polar angle. In a specific embodiment, the slant angle may be 1 °, and thus the revolution angle between two adjacent rotor core segments 231 may be 61 °, 60 °, 59 °, 60 °, 61 °. As shown in table 1 below, the motor rotor 22 of the above embodiment is applied to the motor 20, and torque ripple can be reduced by 70%, electromagnetic force can be reduced by 57%, and noise can be reduced by 7dB, compared to a comparative scheme having only 1 characteristic magnetic pole. Therefore, the motor rotor 22 of the above embodiment can effectively reduce the noise generated by the motor 20 during operation, and improve the working effect of the motor 20, thereby reducing the noise generated by the electric vehicle 10 during operation, and improving the NVH performance and riding comfort of the electric vehicle 10.
| Contrast item | Comparison scheme | This example |
| Torque ripple | 5Nm | 1.5Nm |
| Electromagnetic force | 3500N/mm2 | 1500N/mm2 |
| Noise(s) | 75dB | 68dB |
Table 1 shows comparative data between the comparative protocol and the examples of the present application
Of course, the value of the oblique angle may be specifically set according to the number of teeth of the motor stator 21, for example, in some other embodiments, the oblique angle may also be 0.5 °, 1 ° or 2 °.
In other embodiments, the motor rotor 22 may also be an axially segmented structure. Specifically, rotor core 23 may include x rotor core segments, where x is an integer multiple of m. The x rotor core segments are coaxially arranged along the central axis direction of the rotor core 23. Wherein each rotor core segment is provided with n pole pairs. In assembling the rotor core 23, the revolution angle between adjacent two rotor core segments may be set to 1 pole angle.
Fig. 9 is another structural schematic diagram of the rotor of the motor in the embodiment of the present application. In another specific embodiment, as shown in fig. 9, the motor rotor 22 is an axially segmented structure. Specifically, the motor rotor 22 includes 5 pole pairs, i.e., 10 poles 24. In this embodiment, the pole angle is 36 ° and each pole 24 comprises a permanent magnet 241 arranged in a straight pattern. The 10 poles 24 may have 2 characteristic poles as shown at M, N in fig. 9. The 2 characteristic magnetic poles are alternately arranged according to M, N along the clockwise direction. The rotor core 23 includes 2 rotor core segments 231, and a revolution angle between the 2 rotor core segments 231 may be 36 °.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (13)
1. A motor rotor is characterized by comprising a rotor iron core and n magnetic pole pairs, wherein n is more than or equal to 3, the n magnetic pole pairs comprise 2n magnetic poles, the 2n magnetic poles are arranged around the circumference of the rotor iron core, and each magnetic pole is symmetrical along the center line of the magnetic pole of the motor rotor;
each magnetic pole comprises at least one permanent magnet and permanent magnet grooves which are arranged in one-to-one correspondence to the permanent magnets, the permanent magnet grooves are arranged in the rotor iron core, and the permanent magnets are arranged in the permanent magnet grooves; each magnetic pole further comprises a plurality of surface modified arcs which are arranged corresponding to the at least one permanent magnet, and the surface modified arcs are arranged on the peripheral side surface of the rotor core;
the 2n magnetic poles have m kinds of characteristic magnetic poles, and m is more than or equal to 2; the permanent magnet parameters of any two characteristic magnetic poles are the same, and the permanent magnet slot parameters and the surface arc trimming parameters are different; two adjacent magnetic poles are different characteristic magnetic poles.
2. The electric machine rotor as recited in claim 1, wherein the m characteristic poles and the 2n magnetic poles satisfy: m is a common divisor of 2 n.
3. An electric machine rotor as claimed in claim 1 or 2, characterized in that the electric machine rotor is of an axially segmented construction, the rotor core comprising x rotor core segments, x being an integer multiple of m;
each rotor core section is provided with the n magnetic pole pairs, and the rotation angle between every two adjacent rotor core sections is 1 magnetic pole angle.
4. An electric machine rotor as claimed in claim 1 or 2, characterized in that the electric machine rotor is of a segmented skewed pole construction, the rotor core comprising x rotor core segments, x being an integer multiple of m;
each rotor core section is provided with the n magnetic pole pairs, and the rotation angle between every two adjacent rotor core sections is the sum of 1 magnetic pole angle and an oblique polar angle.
5. An electric machine rotor as claimed in any of claims 1 to 4, characterized in that the permanent magnet parameters comprise the size, material, position or polar arc angle of the permanent magnets.
6. An electric machine rotor as claimed in any of claims 1 to 5, characterized in that the permanent magnet slot parameters comprise width, length, included angle, arc repair radius, magnetic bridge thickness or magnetic bridge length of the permanent magnet slot.
7. An electric machine rotor as claimed in any of claims 1 to 6, wherein the surface-cambered parameters comprise the angle, depth, width, radius or number of the surface-cambered.
8. An electric machine rotor as recited in claim 7, wherein the number of surface reliefs is greater than or equal to 6.
9. An electric machine rotor as claimed in any one of claims 1 to 8, characterized in that said pole comprises one of said permanent magnets arranged in a straight line; or
The magnetic pole comprises at least one pair of permanent magnets arranged in a V shape; or alternatively
The magnetic pole comprises a pair of permanent magnets arranged in a V shape and one permanent magnet arranged in a straight shape.
10. An electric machine rotor as claimed in any of claims 1 to 9, characterized in that the electric machine rotor comprises an internal rotor or a reluctance rotor of the permanent magnet assisted type.
11. An electrical machine comprising an electrical machine stator and an electrical machine rotor according to any one of claims 1 to 10, the electrical machine stator being coaxially nested with the electrical machine rotor.
12. A powertrain comprising a gearbox, a drive shaft and an electric machine according to claim 11, the gearbox being in driving connection with the electric machine via the drive shaft.
13. An electric vehicle comprising a body frame and the powertrain of claim 12, the powertrain being disposed on the body frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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|---|---|
| CN114665630B (en) | 2023-02-03 |
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