CN112615525A - Magnetic gear and composite motor with same - Google Patents
Magnetic gear and composite motor with same Download PDFInfo
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- CN112615525A CN112615525A CN202011381072.7A CN202011381072A CN112615525A CN 112615525 A CN112615525 A CN 112615525A CN 202011381072 A CN202011381072 A CN 202011381072A CN 112615525 A CN112615525 A CN 112615525A
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- inner rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/102—Magnetic gearings, i.e. assembly of gears, linear or rotary, by which motion is magnetically transferred without physical contact
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/005—Machines with only rotors, e.g. counter-rotating rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/106—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with a radial air gap
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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)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
The invention provides a magnetic gear and a composite motor with the same, wherein the magnetic gear comprises: the inner rotor comprises an inner rotor body, wherein a plurality of inner rotor permanent magnets are arranged on the inner rotor body and are arranged at intervals along the circumferential direction of the inner rotor body; the number of pole pairs of the plurality of inner rotor permanent magnets is P1; the yoke comprises a plurality of yoke permanent magnets which are arranged at intervals along the circumferential direction; the number of pole pairs of the plurality of yoke permanent magnets is P2; the modulation ring is arranged between the inner rotor body and the yoke part, and a plurality of modulation blocks are arranged on the modulation ring and are arranged at intervals along the circumferential direction; the number of the plurality of modulation blocks is N, and N is P1+ P2; wherein, the ratio of the rotating speed of the inner rotor body to the rotating speed of the modulation ring is equal to N/P1. The problem that torque fluctuation of a magnetic gear is large in the prior art is solved.
Description
Technical Field
The invention relates to the field of magnetic field modulation type magnetic gears, in particular to a magnetic gear and a composite motor with the same.
Background
At present, a magnetic field modulation type magnetic gear becomes a novel power transmission mechanism, and compared with a mechanical gear, the magnetic field modulation type magnetic gear has the following advantages:
1) mechanical noise and vibration can be reduced;
2) the magnetic gear does not need to be lubricated, so that the maintenance can be reduced, and the reliability of the system is improved;
3) when the load is heavily overloaded, the magnetic gear has self-protection capability;
4) the torque input end and the torque output end are non-contact, and the characteristic has great advantage in the driving of toxic and harmful fluid pumps;
5) the permanent magnet of the magnetic gear is directly arranged on the surface of the rotor, processes such as finish machining, heat treatment and the like are not needed to be carried out on the tooth part like a mechanical gear, and the processing is more convenient than the mechanical gear.
Magnetic field modulated magnetic gears are typically composed of three parts: the outer surface of the inner rotor and the inner surface of the outer rotor are provided with permanent magnets, the modulation ring is composed of a plurality of ferromagnetic materials which are uniformly distributed in the circumferential direction, the iron cores play a role in modulating the internal and external magnetic fields, stable torque transmission can be carried out when the internal and external rotors rotate simultaneously at different speeds by adopting a proper proportion to the number of the iron cores on the modulation ring and the number of the pole pairs of the magnets of the internal and external rotors, and therefore the variable-speed transmission function is achieved.
However, the modulation ring layer of the existing magnetic gear structure is positioned between the inner rotor and the outer rotor to perform a modulation function, the inner rotor and the outer rotor are narrow air gaps, the modulation ring is of a tooth groove structure, and a large number of useless harmonic components are inevitably generated in the two air gaps, and the useless harmonics can reduce the torque which can be effectively transmitted by the magnetic gear and increase the torque fluctuation of the magnetic gear.
Disclosure of Invention
The invention mainly aims to provide a magnetic gear and a composite motor with the same, and aims to solve the problem that the torque fluctuation of the magnetic gear is large in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a magnetic gear comprising: the inner rotor comprises an inner rotor body, wherein a plurality of inner rotor permanent magnets are arranged on the inner rotor body and are arranged at intervals along the circumferential direction of the inner rotor body; the number of pole pairs of the plurality of inner rotor permanent magnets is P1; the yoke comprises a plurality of yoke permanent magnets which are arranged at intervals along the circumferential direction; the number of pole pairs of the plurality of yoke permanent magnets is P2; the modulation ring is arranged between the inner rotor body and the yoke part, and a plurality of modulation blocks are arranged on the modulation ring and are arranged at intervals along the circumferential direction; the number of the plurality of modulation blocks is N, and N is P1+ P2; wherein, the ratio of the rotating speed of the inner rotor body to the rotating speed of the modulation ring is equal to N/P1.
Further, the radial section of the inner rotor permanent magnet is in a sector ring shape, and the radian of the inner rotor permanent magnet is a 1; the air gap distance between the modulation block and the inner rotor permanent magnet is q 1; the radial section of the modulation block is a sector taking the center of a circle of the modulation ring as the center of a circle, and the radian of the modulation block is a 3; 1 < (2 × a1 × P1 × q1)/(a3 × N) < 1.81.
Further, the radial section of the inner rotor permanent magnet is in a sector ring shape, and the radian of the inner rotor permanent magnet is a 1; two adjacent modulation blocks are connected through a magnetic bridge, and the thickness of the magnetic bridge is h 2; the radial section of the modulation block is a sector taking the center of the modulation ring as the center of a circle, and the radian of the modulation block is a 3; 1.6 < (2 × a1 × P1 × h2)/(a3 × N) < 1.81.
Further, the radial section of the inner rotor permanent magnet is in a sector ring shape, and the radian of the inner rotor permanent magnet is a 1; the modulation block is provided with a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet, the second end face is opposite to the yoke permanent magnet, and the distance between the first end face and the second end face is h 3; two adjacent modulation blocks are connected through a magnetic bridge, and the width of the magnetic bridge is a 4; 13.7 < (2 × a1 × P1 × h3)/(a4 × N) < 19.6.
Further, the distance between two adjacent inner rotor permanent magnets is a 2; the radial section of the modulation block is a sector taking the center of the modulation ring as the center of a circle, and the radian of the modulation block is a 3; two adjacent modulation blocks are connected through a magnetic bridge, and the thickness of the magnetic bridge is h 2; 3.9 < (a3 XNXh 2)/(2 Xa 2 XP 1) < 16.
Further, the distance between two adjacent inner rotor permanent magnets is a 2; the radius of the inner rotor body is r 1; two adjacent modulation blocks are connected through a magnetic bridge, and the thickness of the magnetic bridge is h 2; 1.88< r1 × sin (a2 × P1) >/h 2< 26.45.
Further, the distance between two adjacent inner rotor permanent magnets is a 2; the thickness of the inner rotor permanent magnet is h 1; the modulation block is provided with a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet, the second end face is opposite to the yoke permanent magnet, and the distance between the first end face and the second end face is h 3; 1.36 < h 3/[ h1 × sin (a2 × P1) ] < 19.08.
Further, the radius of the inner rotor body is r 1; the radial section of the modulation block is a sector taking the center of the modulation ring as the center of a circle, and the radian of the modulation block is a 3; the modulation block is provided with a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet, the second end face is opposite to the yoke permanent magnet, and the distance between the first end face and the second end face is h 3; 0.21 < sin [ a3 XN × h3)/(2 × r1 ] < 0.63.
Further, the radius of the inner rotor body is r 1; the thickness of the inner rotor permanent magnet is h 1; two adjacent modulation blocks are connected through a magnetic bridge, and the width of the magnetic bridge is a 4; 0.15< sin [ a4 XN Xh 1)/(2 Xr 1 ] < 0.71.
Further, the thickness of the inner rotor permanent magnet is h 1; the air gap distance between the inner rotor permanent magnet and the modulation ring is q 1; two adjacent modulation blocks are connected through a magnetic bridge, and the width of the magnetic bridge is a 4; 0.035 < sin [ a4 XNxq 1)/(2 Xh 1 ] < 0.44.
Further, the cross-sectional area of the radial cross-section of the inner rotor permanent magnet is s1, and the cross-sectional area of the radial cross-section of the modulation block is s2, 0.15< s1/s2< 0.3.
Further, the cross-sectional area of the radial cross-section of the yoke permanent magnet is s3, and the cross-sectional area of the radial cross-section of the modulation block is s2, 0.7< s3/s2< 0.82.
Furthermore, the modulation block is provided with a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet, the second end face is opposite to the yoke permanent magnet, and the distance between the first end face and the second end face is h 3; the distance between every two adjacent yoke permanent magnets is a 6; the thickness of the permanent magnet at the yoke part is h4, and 0.02 < sin [ a6 × P2 × h4)/h3 ] is < 0.59.
Furthermore, the modulation block is provided with a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet, the second end face is opposite to the yoke permanent magnet, and the distance between the first end face and the second end face is h 3; the distance between every two adjacent yoke permanent magnets is a 6; the air gap distance between the modulation ring and the permanent magnet of the yoke part is q 2; 0.3 < (a6 XP 2 xq 2)/h3 < 2.7.
Further, the radial section of the yoke permanent magnet is in a fan-ring shape, and the radian of the yoke permanent magnet is a 5; the radial section of the modulation block is a sector taking the center of the modulation ring as the center of a circle, and the radian of the modulation block is a 3; two adjacent modulation blocks are connected through a magnetic bridge, and the thickness of the magnetic bridge is h 2; 0.52 < (a5 XP 2 XH 2)/a3 < 1.47.
According to another aspect of the present invention, there is provided a hybrid electric machine comprising a magnetic gear as described above.
According to the technical scheme, the magnetic gear comprises an inner rotor body, a yoke part and a modulation ring, wherein a plurality of inner rotor permanent magnets are arranged on the inner rotor body and are arranged at intervals along the circumferential direction of the inner rotor body; the number of pole pairs of the inner rotor permanent magnets is as follows; the yoke comprises a plurality of yoke permanent magnets which are arranged at intervals along the circumferential direction; the number of pole pairs of the permanent magnets of the plurality of yokes is; the modulation ring is arranged between the inner rotor body and the yoke part, and a plurality of modulation blocks are arranged on the modulation ring at intervals along the circumferential direction; the number of the plurality of modulation blocks is N, and N is P1+ P2; wherein, the ratio of the rotating speed of the inner rotor body to the rotating speed of the modulation ring is equal to N/P1. Therefore, the number and the amplitude of useless harmonic components can be obviously reduced, the torque fluctuation of the two output ends is reduced, and meanwhile, the output torque as large as possible is ensured.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic structural diagram of an embodiment of a magnetic gear according to the present invention;
fig. 2 shows a schematic structural view of an inner rotor body of the magnetic gear according to the present invention;
FIG. 3 shows a schematic diagram of a modulation loop according to the present invention;
FIG. 4 shows a schematic structural view of a yoke portion of a magnet gear according to the present invention;
FIG. 5 shows a graph of the inner rotor body output torque of a magnetic gear according to the present invention compared to the inner rotor body output torque of a prior art magnetic gear; and
figure 6 shows a graph of yoke output torque of a magnet gear according to the invention compared to the yoke output torque of a magnet gear of the prior art.
Wherein the figures include the following reference numerals:
1. an inner rotor body; 10. an inner rotor permanent magnet; 2. a yoke portion; 20. a yoke permanent magnet; 3. a modulation loop; 30. a modulation block; 31. a magnetic bridge.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention provides a magnetic gear, please refer to fig. 1 to 4, which comprises an inner rotor body 1, wherein a plurality of inner rotor permanent magnets 10 are arranged on the inner rotor body 1, and the inner rotor permanent magnets 10 are arranged at intervals along the circumferential direction of the inner rotor body 1; the number of pole pairs of the plurality of inner rotor permanent magnets 10 is P1; the yoke 2, the yoke 2 includes a plurality of yoke permanent magnets 20, a plurality of yoke permanent magnets 20 are set up along the circumferential direction interval; the number of pole pairs of the plurality of yoke permanent magnets 20 is P2; a modulation ring 3, wherein the modulation ring 3 is arranged between the inner rotor body 1 and the yoke part 2, a plurality of modulation blocks 30 are arranged on the modulation ring 3, and the modulation blocks 30 are arranged at intervals along the circumferential direction; the number of the plurality of modulation blocks 30 is N, N is P1+ P2; wherein, the ratio of the rotating speed of the inner rotor body 1 to the rotating speed of the modulation ring 3 is equal to N/P1.
The magnetic gear comprises an inner rotor body 1, a yoke part 2 and a modulation ring 3, wherein the inner rotor body 1 is provided with a plurality of inner rotor permanent magnets 10, and the plurality of inner rotor permanent magnets 10 are arranged at intervals along the circumferential direction of the inner rotor body 1; the number of pole pairs of the plurality of inner rotor permanent magnets 10 is P1; the yoke 2 includes a plurality of yoke permanent magnets 20, the plurality of yoke permanent magnets 20 being arranged at intervals in the circumferential direction; the number of pole pairs of the plurality of yoke permanent magnets 20 is P2; the modulation ring 3 is arranged between the inner rotor body 1 and the yoke part 2, a plurality of modulation blocks 30 are arranged on the modulation ring 3, and the modulation blocks 30 are arranged at intervals along the circumferential direction; the number of the plurality of modulation blocks 30 is N, N is P1+ P2; wherein, the ratio of the rotating speed of the inner rotor body 1 to the rotating speed of the modulation ring 3 is equal to N/P1. Therefore, the number and the amplitude of useless harmonic components can be obviously reduced, the torque fluctuation of the two output ends is reduced, and meanwhile, the output torque as large as possible is ensured.
The operation principle of the magnetic gear is that the magnetic fields generated by the inner rotor permanent magnet and the yoke permanent magnet are modulated by the modulation ring, so that the main harmonic component of the modulated inner rotor magnetic field and the main harmonic component of the yoke permanent magnet magnetic field have the same magnetic pole pair number at the outer air gap, and the main harmonic component of the modulated yoke permanent magnet magnetic field and the main harmonic component of the inner rotor permanent magnet magnetic field have the same magnetic pole pair number at the inner air gap. The yoke part is a tooth yoke part of the magnet gear, which is a rotor body disposed outside the modulation ring, in the magnet gear.
In the invention, the inner air gap is an air gap between the modulation ring and the inner rotor permanent magnet, and the outer air gap is an air gap between the modulation ring and the yoke permanent magnet.
As shown in fig. 2, the radial section of the inner rotor permanent magnet 10 is a sector ring shape, and the radian of the inner rotor permanent magnet 10 is a 1; the air gap distance between the modulation block 30 and the inner rotor permanent magnet 10 is q 1; the radial section of the modulation block 30 is a fan shape taking the center of the circle of the modulation ring 3 as the center of the circle, and the radian of the modulation block 30 is a 3; 1 < (2 × a1 × P1 × q1)/(a3 × N) < 1.81. In this range, the modulation ring 3 has a good effect of modulating the magnetic field at the inner air gap, wherein the sector ring is a portion of the circular ring cut by the sector.
In the embodiment provided by the invention, the radial section of the inner rotor permanent magnet 10 is in a sector ring shape, and the radian of the inner rotor permanent magnet 10 is a 1; two adjacent modulation blocks 30 are connected through a magnetic bridge 31, and the thickness of the magnetic bridge 31 is h 2; the radial section of the modulation block 30 is a fan shape with the center of the modulation ring 3 as the center of a circle, and the radian of the modulation block 30 is a 3; 1.6 < (2 × a1 × P1 × h2)/(a3 × N) < 1.81. In this range, the magnetic bridge 31 between the modulation blocks can greatly reduce the magnetic leakage problem caused by the magnetic bridge 31 while ensuring the structural strength, and the amplitude of the main harmonic component in the invention is not reduced compared with the general scheme.
The radial section of the inner rotor permanent magnet 10 is in a sector ring shape, and the radian of the inner rotor permanent magnet 10 is a 1; the modulation block 30 has a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet 10, the second end face is opposite to the yoke permanent magnet 20, and the distance between the first end face and the second end face is h 3; two adjacent modulation blocks 30 are connected through a magnetic bridge 31, and the width of the magnetic bridge 31 is a 4; 13.7 < (2 × a1 × P1 × h3)/(a4 × N) < 19.6. In the range, the size of the gear output torque is ensured, and meanwhile, the matching between the inner rotor permanent magnet 10 and the modulation ring 3 is enhanced, so that the modulation effect is further enhanced. As shown in fig. 5, the inner rotor body and the inner rotor permanent magnet are collectively referred to as an inner rotor, and the torque fluctuation of the inner rotor is smaller and more stable than that of a general scheme.
The distance between two adjacent inner rotor permanent magnets 10 is a 2; the radial section of the modulation block 30 is a fan shape with the center of the modulation ring 3 as the center of a circle, and the radian of the modulation block 30 is a 3; two adjacent modulation blocks 30 are connected through a magnetic bridge 31, and the thickness of the magnetic bridge 31 is h 2; 3.9 < (a3 XNXh 2)/(2 Xa 2 XP 1) < 16. Within this range, the number of useless harmonics among the flux density harmonics at the inner air gap can be reduced as much as possible.
The distance between two adjacent inner rotor permanent magnets 10 is a 2; the radius of the inner rotor body 1 is r 1; two adjacent modulation blocks 30 are connected through a magnetic bridge 31, and the thickness of the magnetic bridge 31 is h 2; 1.88< r1 × sin (a2 × P1) >/h 2< 26.45. In this range, the distortion of the magnetic field lines when the magnetic field passes through the inner rotor body and the modulation ring is less, and the number of corresponding unwanted harmonics is also less.
The distance between two adjacent inner rotor permanent magnets 10 is a 2; the thickness of the inner rotor permanent magnet 10 is h 1; the modulation block 30 has a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet 10, the second end face is opposite to the yoke permanent magnet 20, and the distance between the first end face and the second end face is h 3; 1.36 < h 3/[ h1 × sin (a2 × P1) ] < 19.08. Within this range, the percentage of the magnetic field of the inner rotor permanent magnets modulated by the modulation ring is relatively greater, and high torque is maintained, while also reducing the generation of unwanted harmonics, as shown in fig. 5, and the torque ripple of the inner rotor is significantly reduced.
The radius of the inner rotor body 1 is r 1; the radial section of the modulation block 30 is a fan shape with the center of the modulation ring 3 as the center of a circle, and the radian of the modulation block 30 is a 3; the modulation block 30 has a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet 10, the second end face is opposite to the yoke permanent magnet 20, and the distance between the first end face and the second end face is h 3; 0.21 < sin [ a3 XN × h3)/(2 × r1 ] < 0.63. This range primarily constrains the shape of the modulation ring 3 so that it can better fit with the inner rotor.
The radius of the inner rotor body 1 is r 1; the thickness of the inner rotor permanent magnet 10 is h 1; two adjacent modulation blocks 30 are connected through a magnetic bridge 31, and the width of the magnetic bridge 31 is a 4; 0.15< sin [ a4 XN Xh 1)/(2 Xr 1 ] < 0.71. This range primarily constrains the size of the inner rotor to enable a better fit with the modulation ring.
The thickness of the inner rotor permanent magnet 10 is h 1; the air gap distance between the inner rotor permanent magnet 10 and the modulation ring 3 is q 1; two adjacent modulation blocks 30 are connected through a magnetic bridge 31, and the width of the magnetic bridge 31 is a 4; 0.035 < sin [ a4 XNxq 1)/(2 Xh 1 ] < 0.44. This range is mainly for ensuring the torque transmission capability of the inner rotor, as shown in fig. 6, compared with the general technical solution, the magnetic gear provided by the present invention maintains the high torque of the low-speed output end on the premise of reducing the torque fluctuation.
The cross-sectional area of the radial cross-section of the inner rotor permanent magnet 10 is s1, and the cross-sectional area of the radial cross-section of the modulation block 30 is s2, 0.15< s1/s2< 0.3. Within this range, the effect of modulating the magnetic field of the inner rotor is more desirable.
The cross-sectional area of the radial cross-section of the yoke permanent magnet 20 is s3, and the cross-sectional area of the radial cross-section of the modulation block 30 is s2, 0.7< s3/s2< 0.82. In this range, the effect of modulating the magnetic field of the yoke is more preferable.
The modulation block 30 has a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet 10, the second end face is opposite to the yoke permanent magnet 20, and the distance between the first end face and the second end face is h 3; the distance between two adjacent yoke permanent magnets 20 is a 6; the yoke permanent magnet 20 has a thickness h4, 0.02 < sin [ a6 × P2 × h4)/h3 ] < 0.59. The range constraint is used for improving the matching degree between the magnetic field of the permanent magnet at the yoke part and the modulation ring 3, so that the magnetic density distribution at the position of an outer air gap is more ideal, and useless harmonic waves are restrained under the range constraint.
The modulation block 30 has a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet 10, the second end face is opposite to the yoke permanent magnet 20, and the distance between the first end face and the second end face is h 3; the distance between two adjacent yoke permanent magnets 20 is a 6; the air gap distance between the modulation ring 3 and the yoke permanent magnet 20 is q 2; 0.3 < (a6 XP 2 xq 2)/h3 < 2.7. The range constraint is to further improve the fit between the modulation ring 3 and the magnetic field of the permanent magnet of the yoke part, and maintain the torque on the premise of reducing the torque fluctuation.
The radial section of the yoke permanent magnet 20 is in a sector ring shape, and the radian of the yoke permanent magnet 20 is a 5; the radial section of the modulation block 30 is a fan shape with the center of the modulation ring 3 as the center of a circle, and the radian of the modulation block 30 is a 3; two adjacent modulation blocks 30 are connected through a magnetic bridge 31, and the thickness of the magnetic bridge 31 is h 2; 0.52 < (a5 XP 2 XH 2)/a3 < 1.47. The range is mainly used for limiting the shape of the modulation ring 3, further reducing the magnetic leakage among the modulation blocks, improving the magnetic field utilization rate at the outer air gap and achieving the effect of transmitting more torque.
The invention also provides a composite motor which comprises the magnetic gear, wherein the magnetic gear is the magnetic gear of the embodiment.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the magnetic gear comprises an inner rotor body, a yoke part 2 and a modulation ring 3, wherein the inner rotor body 1 is provided with a plurality of inner rotor permanent magnets 10, and the plurality of inner rotor permanent magnets 10 are arranged at intervals along the circumferential direction of the inner rotor body 1; the number of pole pairs of the plurality of inner rotor permanent magnets 10 is P1; the yoke 2 includes a plurality of yoke permanent magnets 20, the plurality of yoke permanent magnets 20 being arranged at intervals in the circumferential direction; the number of pole pairs of the plurality of yoke permanent magnets 20 is P2; the modulation ring 3 is arranged between the inner rotor body 1 and the yoke part 2, a plurality of modulation blocks 30 are arranged on the modulation ring 3, and the modulation blocks 30 are arranged at intervals along the circumferential direction; the number of the plurality of modulation blocks 30 is N, N is P1+ P2; wherein, the ratio of the rotating speed of the inner rotor body 1 to the rotating speed of the modulation ring 3 is equal to N/P1. Therefore, the number and the amplitude of useless harmonic components can be obviously reduced, the torque fluctuation of the two output ends is reduced, and meanwhile, the output torque as large as possible is ensured.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (16)
1. A magnetic gear, comprising:
the inner rotor comprises an inner rotor body (1), wherein a plurality of inner rotor permanent magnets (10) are arranged on the inner rotor body (1), and the inner rotor permanent magnets (10) are arranged at intervals along the circumferential direction of the inner rotor body (1); the number of pole pairs of the plurality of inner rotor permanent magnets (10) is P1;
a yoke (2), the yoke (2) comprising a plurality of yoke permanent magnets (20), the plurality of yoke permanent magnets (20) being arranged at intervals in a circumferential direction; the number of pole pairs of the plurality of yoke permanent magnets (20) is P2;
a modulation ring (3), wherein the modulation ring (3) is arranged between the inner rotor body (1) and the yoke part (2), a plurality of modulation blocks (30) are arranged on the modulation ring (3), and the modulation blocks (30) are arranged at intervals along the circumferential direction; the number of the plurality of modulation blocks (30) is N, and N is P1+ P2;
wherein the ratio between the rotational speed of the inner rotor body (1) and the rotational speed of the modulation ring (3) is equal to N/P1.
2. The magnetic gear according to claim 1, wherein the inner rotor permanent magnet (10) has a sector ring shape in radial cross section, and the arc of the inner rotor permanent magnet (10) is a 1; the air gap distance between the modulation block (30) and the inner rotor permanent magnet (10) is q 1; the radial section of the modulation block (30) is a fan shape taking the circle center of the modulation ring (3) as the circle center, and the radian of the modulation block (30) is a 3;
1＜(2×a1×P1×q1)/(a3×N)＜1.81。
3. the magnetic gear according to claim 1, wherein the inner rotor permanent magnet (10) has a sector ring shape in radial cross section, and the arc of the inner rotor permanent magnet (10) is a 1; two adjacent modulation blocks (30) are connected through a magnetic bridge (31), and the thickness of the magnetic bridge (31) is h 2; the radial section of the modulation block (30) is a fan shape taking the center of the modulation ring (3) as the center of a circle, and the radian of the modulation block (30) is a 3;
1.6＜(2×a1×P1×h2)/(a3×N)＜1.81。
4. the magnetic gear according to claim 1, wherein the inner rotor permanent magnet (10) has a sector ring shape in radial cross section, and the arc of the inner rotor permanent magnet (10) is a 1; the modulation block (30) has a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet (10), the second end face is opposite to the yoke permanent magnet (20), and the distance between the first end face and the second end face is h 3; two adjacent modulation blocks (30) are connected through a magnetic bridge (31), and the width of the magnetic bridge (31) is a 4;
13.7＜(2×a1×P1×h3)/(a4×N)＜19.6。
5. the magnetic gear according to claim 1, wherein a distance between adjacent two of the inner rotor permanent magnets (10) is a 2; the radial section of the modulation block (30) is a fan shape taking the center of the modulation ring (3) as the center of a circle, and the radian of the modulation block (30) is a 3; two adjacent modulation blocks (30) are connected through a magnetic bridge (31), and the thickness of the magnetic bridge (31) is h 2;
3.9＜(a3×N×h2)/(2×a2×P1)＜16。
6. the magnetic gear according to claim 1, wherein a distance between adjacent two of the inner rotor permanent magnets (10) is a 2; the radius of the inner rotor body (1) is r 1; two adjacent modulation blocks (30) are connected through a magnetic bridge (31), and the thickness of the magnetic bridge (31) is h 2;
1.88<【r1×sin(a2×P1)】/h2<26.45。
7. the magnetic gear according to claim 1, wherein a distance between adjacent two of the inner rotor permanent magnets (10) is a 2; the thickness of the inner rotor permanent magnet (10) is h 1; the modulation block (30) has a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet (10), the second end face is opposite to the yoke permanent magnet (20), and the distance between the first end face and the second end face is h 3;
1.36＜h3/【h1×sin(a2×P1)】＜19.08。
8. the magnetic gear according to claim 1, characterized in that the inner rotor body (1) has a radius r 1; the radial section of the modulation block (30) is a fan shape taking the center of the modulation ring (3) as the center of a circle, and the radian of the modulation block (30) is a 3; the modulation block (30) has a first end face and a second end face which are oppositely arranged, the first end face is opposite to the inner rotor permanent magnet (10), the second end face is opposite to the yoke permanent magnet (20), and the distance between the first end face and the second end face is h 3;
0.21＜sin【(a3×N×h3)/(2×r1)】＜0.63。
9. the magnetic gear according to claim 1, characterized in that the inner rotor body (1) has a radius r 1; the thickness of the inner rotor permanent magnet (10) is h 1; two adjacent modulation blocks (30) are connected through a magnetic bridge (31), and the width of the magnetic bridge (31) is a 4;
0.15＜sin【(a4×N×h1)/(2×r1)】＜0.71。
10. the magnetic gear according to claim 1, characterized in that the inner rotor permanent magnet (10) has a thickness h 1; the air gap distance between the inner rotor permanent magnet (10) and the modulation ring (3) is q 1; two adjacent modulation blocks (30) are connected through a magnetic bridge (31), and the width of the magnetic bridge (31) is a 4;
0.035＜sin【(a4×N×q1)/(2×h1)】＜0.44。
11. the magnetic gear according to any of claims 1 to 10, wherein the cross-sectional area of the radial cross-section of the inner rotor permanent magnet (10) is s1, the cross-sectional area of the radial cross-section of the modulation block (30) is s2, 0.15< s1/s2< 0.3.
12. The magnet gear according to any of claims 1 to 10, characterized in that the cross-sectional area of the radial cross-section of the yoke permanent magnet (20) is s3, the cross-sectional area of the radial cross-section of the modulation block (30) is s2, 0.7< s3/s2< 0.82.
13. The magnetic gear according to any one of claims 1 to 10, wherein the modulation block (30) has a first end face and a second end face that are disposed oppositely, the first end face being opposed to the inner rotor permanent magnet (10), the second end face being opposed to the yoke permanent magnet (20), a distance between the first end face and the second end face being h 3; the distance between two adjacent yoke permanent magnets (20) is a 6; the yoke permanent magnet (20) has a thickness h4,
0.02＜sin【(a6×P2×h4)/h3】＜0.59。
14. the magnetic gear according to any one of claims 1 to 10, wherein the modulation block (30) has a first end face and a second end face that are disposed oppositely, the first end face being opposed to the inner rotor permanent magnet (10), the second end face being opposed to the yoke permanent magnet (20), a distance between the first end face and the second end face being h 3; the distance between two adjacent yoke permanent magnets (20) is a 6; the air gap distance between the modulation ring (3) and the yoke permanent magnet (20) is q 2;
0.3＜(a6×P2×q2)/h3＜2.7。
15. the magnetic gear according to any of claims 1 to 10, characterized in that the yoke permanent magnet (20) is sector-shaped in radial cross section, the arc of the yoke permanent magnet (20) being a 5; the radial section of the modulation block (30) is a fan shape taking the center of the modulation ring (3) as the center of a circle, and the radian of the modulation block (30) is a 3; two adjacent modulation blocks (30) are connected through a magnetic bridge (31), and the thickness of the magnetic bridge (31) is h 2;
0.52＜(a5×P2×h2)/a3＜1.47。
16. a compound electric machine comprising a magnetic gear, characterised in that the magnetic gear is as claimed in any one of claims 1 to 15.
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| CN113328595A (en) * | 2021-06-03 | 2021-08-31 | 哈尔滨理工大学 | Novel birotor vernier motor structure |
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