CN112615520B - Magnetic gear and composite motor with same - Google Patents

Magnetic gear and composite motor with same Download PDF

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Publication number
CN112615520B
CN112615520B CN202011376826.XA CN202011376826A CN112615520B CN 112615520 B CN112615520 B CN 112615520B CN 202011376826 A CN202011376826 A CN 202011376826A CN 112615520 B CN112615520 B CN 112615520B
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China
Prior art keywords
inner rotor
rotor body
permanent magnet
rotor permanent
modulation
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CN202011376826.XA
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Chinese (zh)
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CN112615520A (en
Inventor
陈彬
肖勇
李权锋
桂鹏千
马晓皓
刘美扬
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • 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
    • 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
    • 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
    • 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)

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 on the inner rotor body at intervals along the circumferential direction; the outer rotor comprises an outer rotor body, wherein a plurality of outer rotor permanent magnets are arranged on the outer rotor body at intervals along the circumferential direction; the modulation ring is arranged between the inner rotor body and the outer rotor body and comprises a plurality of modulation blocks which are arranged at intervals along the circumferential direction; and at least part of the first air groove is positioned on one side of the inner rotor permanent magnet, which is close to the outer circumferential surface of the inner rotor body. The invention solves the problem of large torque fluctuation of the magnetic gear in the prior art.

Description

Magnetic gear and composite motor with same
Technical Field
The invention relates to the field of 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 is a novel power transmission mechanism, the torque transmission efficiency of the mechanism is almost the same as that of a mechanical gear, and the magnetic gear has the advantages of small mechanical noise, small vibration, non-contact transmission and the like compared with the mechanical gear.
However, the conventional magnetic gear has problems such as large transmission torque fluctuation and insufficient torque capacity, and also has a problem of excessive use of the permanent magnet, thereby causing a reduction in the application performance 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 on the inner rotor body at intervals along the circumferential direction; the outer rotor comprises an outer rotor body, wherein a plurality of outer rotor permanent magnets are arranged on the outer rotor body at intervals along the circumferential direction; the modulation ring is arranged between the inner rotor body and the outer rotor body and comprises a plurality of modulation blocks which are arranged at intervals along the circumferential direction; and at least part of the first air groove is positioned on one side of the inner rotor permanent magnet, which is close to the outer circumferential surface of the inner rotor body.
Furthermore, the first air grooves extend along the circumferential direction of the inner rotor body, the first air grooves are multiple, the multiple first air grooves are arranged in pairs, and each pair of first air grooves are respectively arranged at two ends of the inner rotor permanent magnet.
Further, the first air groove extends towards the middle direction of the inner rotor permanent magnet, and the distance between the groove wall surface of the first air groove close to the outer peripheral surface of the inner rotor body and the outer peripheral surface of the inner rotor body is delta R1.
Further, each pair of first air grooves comprises a first side air groove and a second side air groove, the first side air groove is provided with a first side surface, the second side air groove is provided with a second side surface, the first side surface is opposite to the second side surface, and an included angle between the first side surface and the second side surface is theta 1; the central angle corresponding to the side surface of the inner rotor permanent magnet facing the central direction of the inner rotor body is theta 2; wherein theta 1/theta 2 is more than or equal to 0.16 and less than or equal to 0.72.
Further, the first air slot includes a first slot wall surface and a second slot wall surface which are oppositely arranged along the radial direction of the inner rotor body, and the distance between the first slot wall surface and the second slot wall surface is Δ R3; the radius of the inner rotor body is R1; the minimum distance between the inner rotor permanent magnet and the circle center of the inner rotor body is L1, and the thickness of the inner rotor permanent magnet is PD 1; wherein, the Delta R3/(R1-L1-PD1) is more than or equal to 0.15 and less than or equal to 0.35.
Further, the magnetic gear further includes: and at least part of the second air groove is arranged between the two adjacent inner rotor permanent magnets, and the second air groove is sunken towards the central direction of the inner rotor body.
Further, the distance between the side wall surface of the second air groove and the side surface of the inner rotor permanent magnet is delta R2, and the range of delta R2/delta R1 is 0.75-1.25.
Further, the second air groove includes a third groove wall surface and a fourth groove wall surface which are oppositely arranged along the circumferential direction of the inner rotor body, and the minimum distance between the third groove wall surface and the fourth groove wall surface is D1; the radial section of the inner rotor permanent magnet is rectangular, the length of the inner rotor permanent magnet is PW1, and the central angle corresponding to the side surface of the inner rotor permanent magnet facing the center direction of the inner rotor body is theta 2; the number of pole pairs of the plurality of inner rotor permanent magnets is P1; wherein, the ratio of [ 2 xD 1 xsin (theta 2/2) ] to [ PW1 xsin [ pi-theta 2 xP 1)/(2 xP 1) ] is less than or equal to 0.7 and less than or equal to 0.9.
Further, the range of θ 2 XP 1/π is 0.9-0.92.
Further, the radial section of the inner rotor body is circular, the inner radius of the circular ring is R2, the outer radius of the circular ring is R1, the thickness of the inner rotor permanent magnet is PD1, and the value range of PD 1/(R1-R2) is 0.1-0.3.
Further, the minimum distance between the inner rotor permanent magnet and the center of the inner rotor body is L1, the radial section of the inner rotor body is in a circular ring shape, the inner radius of the circular ring shape is R2, and the value range of L1/(L1-R2) is 1.7-1.8.
Furthermore, two adjacent modulation blocks are connected through a magnetic bridge, the radial cross sections of the modulation blocks and the magnetic bridge are both in a sector ring shape, the sum of the central angle of the radial cross section of the modulation block and the central angle of the radial cross section of the magnetic bridge is theta 3, the central angle corresponding to the modulation block is theta 4, and theta 4/theta 3 is more than or equal to 0.35 and less than or equal to 0.7.
Further, the outer radius of the modulation ring is R3, the radial section of the modulation block is a sector ring, the central angle corresponding to the sector ring is theta 4, and the thickness of the modulation block in the radial direction is MD 1; the number of the modulation blocks is P3, the number of the pole pairs of the inner rotor permanent magnets is P1, the number of the modulation blocks corresponding to one inner rotor permanent magnet is P3/(2 multiplied by P1), and the total area of the radial cross sections of the inner rotor permanent magnets and the number of the inner rotor permanent magnets are P3/(2 multiplied by P1)The sum of the total areas of the radial cross-sections of the modulation block being SPM1(ii) a Wherein [ P3 × (θ 4 × R3 × MD1) ]/S is not less than 0.7PM1≤0.85。
Furthermore, the outer radius of the modulation ring is R3, the thickness of the outer rotor permanent magnet along the radial direction of the outer rotor body is PD2, the distance between the modulation block and the outer rotor permanent magnet is delta G1, the radial section of the outer rotor permanent magnet is in a fan-shaped ring shape, and the central angle corresponding to the fan-shaped ring shape is theta 5; wherein [ PD2 × theta 5/2(R3+ Δ G1+ PD2/2) ] is not less than 0.85/(theta 4 × R3 × MD1) is not more than 1.15.
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, an outer rotor body, a modulation ring and a first air groove, wherein a plurality of inner rotor permanent magnets are arranged on the inner rotor body and are arranged on the inner rotor body at intervals along the circumferential direction; the outer rotor body is provided with a plurality of outer rotor permanent magnets which are arranged on the outer rotor body at intervals along the circumferential direction; the modulation ring is arranged between the inner rotor body and the outer rotor body and comprises a plurality of modulation blocks which are arranged at intervals along the circumferential direction; the first air groove is arranged on the inner rotor body, and at least part of the first air groove is positioned on one side of the inner rotor permanent magnet, which is close to the outer circumferential surface of the inner rotor body. The arrangement can effectively reduce the torque fluctuation of the output torque and increase the output stability of the magnetic gear.
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 of a modulating ring of a magnetic gear according to the present invention;
FIG. 3 shows a graph comparing the effect of L1/(L1-R2) values on iron loss for a magnetic gear according to the present invention;
FIG. 4 shows a comparison graph of the effect of Δ R1/(R1-L1-PD1) on output torque for a magnetic gear according to the present invention;
FIG. 5 is a graph illustrating the effect of the size of D1 on loss for a magnetic gear according to the present invention; (ii) a
FIG. 6 is a graph comparing the effect of D1 on inner rotor permanent magnet end leakage flux in accordance with the magnet gear of the present invention;
FIG. 7 shows a graph comparing the effect of θ 1/θ 2 values on loss for a magnetic gear according to the present invention; and
FIG. 8 shows a graph comparing the effect of θ 1/θ 2 values on torque ripple for a magnetic gear according to the present invention.
Wherein the figures include the following reference numerals:
1. an inner rotor body; 10. an inner rotor permanent magnet; 2. an outer rotor body; 20. an outer rotor permanent magnet; 3. a modulation loop; 30. a modulation block; 4. a first air tank; 31. a magnetic bridge; 5. a second air tank.
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 present invention provides a magnetic gear, please refer to fig. 1 and 2, 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 on the inner rotor body 1 at intervals along the circumferential direction; the outer rotor comprises an outer rotor body 2, wherein a plurality of outer rotor permanent magnets 20 are arranged on the outer rotor body 2, and the plurality of outer rotor permanent magnets 20 are arranged on the outer rotor body 2 at intervals along the circumferential direction; a modulation ring 3 disposed between the inner rotor body 1 and the outer rotor body 2, the modulation ring 3 including a plurality of modulation blocks 30, the plurality of modulation blocks 30 being disposed at intervals in a circumferential direction; and the first air groove 4 is arranged on the inner rotor body 1, and at least part of the first air groove 4 is positioned on one side of the inner rotor permanent magnet 10 close to the outer circumferential surface of the inner rotor body 1.
The magnetic gear comprises an inner rotor body 1, an outer rotor body 2, a modulation ring 3 and a first air groove 4, wherein the inner rotor body 1 is provided with a plurality of inner rotor permanent magnets 10, and the inner rotor permanent magnets 10 are arranged on the inner rotor body 1 at intervals along the circumferential direction; a plurality of outer rotor permanent magnets 20 are arranged on the outer rotor body 2, and the plurality of outer rotor permanent magnets 20 are arranged on the outer rotor body 2 at intervals along the circumferential direction; the modulation ring 3 is arranged between the inner rotor body 1 and the outer rotor body 2, the modulation ring 3 comprises a plurality of modulation blocks 30, and the modulation blocks 30 are arranged at intervals along the circumferential direction; the first air slot 4 is arranged on the inner rotor body 1, and at least part of the first air slot 4 is positioned on one side of the inner rotor permanent magnet 10 close to the outer circumferential surface of the inner rotor body 1. The arrangement can effectively reduce the torque fluctuation of the output torque and increase the output stability of the magnetic gear.
It should be noted here that the inner rotor body 1, the outer rotor body 2, and the modulation ring 3 are coaxial, and the extending direction of the radial cross section in the present invention is a direction perpendicular to the plane of the axis of the inner rotor body 1.
In the specific implementation process, the first air grooves 4 extend along the circumferential direction of the inner rotor body 1, the number of the first air grooves 4 is multiple, the multiple first air grooves 4 are arranged in pairs, and each pair of the first air grooves 4 is respectively arranged at two ends of the inner rotor permanent magnet 10. Therefore, the magnetic lines of force at the two ends of the inner rotor permanent magnet 10 are uniformly distributed, and the output torque of the inner rotor is improved.
Preferably, the first air groove 4 extends toward the middle of the inner rotor permanent magnet 10, and the distance between the groove wall surface of the first air groove 4 close to the outer circumferential surface of the inner rotor body 1 and the outer circumferential surface of the inner rotor body 1 is Δ R1.
Each pair of first air grooves 4 comprises a first side air groove and a second side air groove, the first side air groove is provided with a first side surface, the second side air groove is provided with a second side surface, the first side surface is opposite to the second side surface, and the included angle between the first side surface and the second side surface is theta 1; the central angle corresponding to the side surface of the inner rotor permanent magnet 10 facing the central direction of the inner rotor body 1 is theta 2; wherein theta 1/theta 2 is more than or equal to 0.16 and less than or equal to 0.72. 2 pi/P3, as shown in fig. 7 and 8, when the value of θ 1/θ 2 is larger, θ 1 is larger, and the torque ripple optimization effect is worse; conversely, when the value of θ 1/θ 2 is smaller, θ 1 is smaller, and the area of the cross section of the inner rotor permanent magnet 10 is smaller, so that the magnetic density at the position of the inner rotor permanent magnet 10 is easily saturated, and the loss of the inner rotor permanent magnet is larger.
In specific implementation, the first air slot 4 includes a first slot wall surface and a second slot wall surface which are oppositely arranged along the radial direction of the inner rotor body 1, and the distance between the first slot wall surface and the second slot wall surface is Δ R3; the radius of the inner rotor body 1 is R1; the minimum distance between the inner rotor permanent magnet 10 and the center of the inner rotor body 1 is L1, and the thickness of the inner rotor permanent magnet 10 is PD 1; wherein, the Delta R3/(R1-L1-PD1) is more than or equal to 0.15 and less than or equal to 0.35. As shown in fig. 4, when R1, L1, and PD1 remain unchanged, if Δ R3 is too large, the area of the plane of the inner rotor permanent magnet opposite to the first air groove is increased, which reduces torque output; if Δ R3 is too small, the optimization effect of the torque ripple is not significant, and it is apparent from fig. 4 that when Δ R3 is too small, the torque ripple is reduced from only 0.018 to 0.017.
In an embodiment provided by the present invention, the magnetic gear further comprises: and the second air slot 5, at least part of the second air slot 5 is arranged between two adjacent inner rotor permanent magnets 10, and the second air slot is sunken towards the central direction of the inner rotor body 1. Preferably, the radial cross section of the second air groove 5 is trapezoidal.
The distance between the side wall surface of the second air slot 5 and the side surface of the inner rotor permanent magnet 10 is delta R2, and the range of delta R2/delta R1 is 0.75-1.25. The second air groove 5 can increase the magnetic resistance at the motor quadrature axis, reduce the magnetic resistance torque between the motor quadrature axis and the motor direct axis caused by the asymmetry of the magnetic circuit, and further reduce the torque fluctuation.
The second air groove 5 includes a third groove wall surface and a fourth groove wall surface which are oppositely arranged along the circumferential direction of the inner rotor body 1, and the minimum distance between the third groove wall surface and the fourth groove wall surface is D1; the radial section of the inner rotor permanent magnet 10 is rectangular, the length of the inner rotor permanent magnet 10 is PW1, and the central angle corresponding to the side surface of the inner rotor permanent magnet 10 facing the center direction of the inner rotor body 1 is theta 2; the number of pole pairs of the plurality of inner rotor permanent magnets 10 is P1; wherein, the ratio of [ 2 xD 1 xsin (theta 2/2) ] to [ PW1 xsin [ pi-theta 2 xP 1)/(2 xP 1) ] is less than or equal to 0.7 and less than or equal to 0.9. In the above relational expression, as shown in fig. 5 and 6, if the value of [ 2 × D1 × sin (θ 2/2) ]/{ PW1 × sin [ pi- θ 2 × P1)/(2 × P1) ], which is too small, D1 is too small, which affects the trend of the inter-stimulation magnetic flux lines, so that flux saturation is likely to occur at the end of the second air slot, thereby increasing the inner rotor loss; if the value of [ 2 × D1 × sin (θ 2/2) ]/{ PW1 × sin [ pi- θ 2 × P1)/(2 × P1) ], is too large, D1 is too large, which increases the end leakage flux of the inner rotor permanent magnet, and increases the end leakage flux between adjacent magnetic poles and the end leakage flux of the inner rotor permanent magnet. When D1 is 3.96, the number of magnetic lines between the poles is 0, and the magnetic line of a single pole coupled through the end of the single pole is 1, so that the loss is small; when D is 7.6, the number of magnetic lines between the poles is 1, and the magnetic lines of a single pole coupled through the end thereof are 2, which results in a large loss.
The theta 2 XP 1/pi is in the range of 0.9-0.92. The ratio cannot be designed to be too large, if the value of theta 2 xP 1/pi is too small, namely theta 2 is too small, the sectional area of the radial section of the inner rotor permanent magnet 10 is too small, so that the magnetic density at the position is easy to saturate, and the loss is increased.
The radial section of the inner rotor body 1 is circular, the inner radius of the circular ring is R2, the outer radius of the circular ring is R1, the thickness of the inner rotor permanent magnet 10 is PD1, and the value range of PD 1/(R1-R2) is 0.1-0.3. This scope has stipulated the ratio that accounts for of the thickness of inner rotor permanent magnet 10 in inner rotor body radial direction, when R1 and R2 are certain, if this ratio is too big, then the thickness PD1 of inner rotor permanent magnet can be too big, the yoke portion of inner rotor body or the area of the radial cross section of inner rotor permanent magnet can the undersize this moment, easy magnetic flux density saturation causes the loss too big, if this ratio undersize, then the thickness of inner rotor permanent magnet can the undersize, can't provide sufficient confession magnetic area, cause output torque to reduce. It should be noted here that the radial cross section of the inner rotor body 1 is a circular ring shape, and the yoke portion of the inner rotor body is a portion between the inner circumferential surface of the inner rotor body and the inner rotor permanent magnet.
The minimum distance between the inner rotor permanent magnet 10 and the center of the inner rotor body 1 is L1, the radial section of the inner rotor body 1 is circular, the inner radius of the circular is R2, and the value range of L1/(L1-R2) is 1.7-1.8. As shown in fig. 3, an excessively small L1 influences the loss of the inner rotor, when the inner radius of the inner rotor body is not changed, if the ratio is excessively large, L1 will be excessively large, which may cause the area of the radial cross section of the inner rotor permanent magnet to be excessively small, so that the magnetic density of the inner rotor permanent magnet is easily saturated, and the loss is increased; if the ratio is too small, the too small L1 makes the mounting groove for mounting the inner rotor permanent magnet close to the center of the inner rotor body, which results in too small area of the yoke part of the inner rotor body 1, increasing the magnetic density of the yoke part, increasing loss, and making the distance between adjacent magnetic poles too small, increasing the end leakage flux between the two adjacent magnetic poles.
Two adjacent modulation blocks 30 are connected through a magnetic bridge 31, the radial cross sections of the modulation blocks 30 and the magnetic bridge 31 are both in a fan-ring shape, the sum of the central angle of the radial cross section of the modulation block 30 and the central angle of the radial cross section of the magnetic bridge 31 is theta 3, the central angle corresponding to the modulation block 30 is theta 4, and theta 4/theta 3 is more than or equal to 0.35 and less than or equal to 0.7. The range can ensure that the modulation efficiency of the modulation ring is optimal, and the modulation efficiency is influenced by the ratio which is too large or too small, so that the output torque is reduced.
In the embodiment provided by the invention, the outer radius of the modulation ring 3 is R3, the radial section of the modulation block 30 is a sector ring, the central angle corresponding to the sector ring is θ 4, and the thickness of the modulation block 30 in the radial direction is MD 1; the number of the modulation blocks 30 is P3, the number of the pole pairs of the inner rotor permanent magnets 10 is P1, the number of the modulation blocks 30 corresponding to one inner rotor permanent magnet 10 is P3/2 multiplied by P1, and the modulation blocks are rotated in a plurality of inner rotorsThe sum of the total area of the radial cross sections of the sub-permanent magnets 10 and the plurality of modulation blocks 30 is SPM1(ii) a Wherein [ P3 × (θ 4 × R3 × MD1) ]/S is not less than 0.7PM1≤0.85。
Specifically, the outer radius of the modulation ring 3 is R3, the thickness of the outer rotor permanent magnet 20 in the radial direction of the outer rotor body 2 is PD2, the distance between the modulation block 30 and the outer rotor permanent magnet 20 is Δ G1, the radial cross section of the outer rotor permanent magnet 20 is a sector ring shape, and the central angle corresponding to the sector ring shape is θ 5; wherein [ PD2 × theta 5/2(R3+ Δ G1+ PD2/2) ] is not less than 0.85/(theta 4 × R3 × MD1) is not more than 1.15. This range constraint reduces torque ripple while ensuring the output torque of the magnetic gear.
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 1, an outer rotor body 2, a modulation ring 3 and a first air groove 4, wherein the inner rotor body 1 is provided with a plurality of inner rotor permanent magnets 10, and the inner rotor permanent magnets 10 are arranged on the inner rotor body 1 at intervals along the circumferential direction; a plurality of outer rotor permanent magnets 20 are arranged on the outer rotor body 2, and the plurality of outer rotor permanent magnets 20 are arranged on the outer rotor body 2 at intervals along the circumferential direction; the modulation ring 3 is arranged between the inner rotor body 1 and the outer rotor body 2, the modulation ring 3 comprises a plurality of modulation blocks 30, and the modulation blocks 30 are arranged at intervals along the circumferential direction; the first air slot 4 is arranged on the inner rotor body 1, and at least part of the first air slot 4 is positioned on one side of the inner rotor permanent magnet 10 close to the outer circumferential surface of the inner rotor body 1. The arrangement can effectively reduce the torque fluctuation of the output torque and increase the output stability of the magnetic gear.
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 description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 (13)

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 on the inner rotor body (1) at intervals along the circumferential direction;
the outer rotor comprises an outer rotor body (2), wherein a plurality of outer rotor permanent magnets (20) are arranged on the outer rotor body (2), and the plurality of outer rotor permanent magnets (20) are arranged on the outer rotor body (2) at intervals along the circumferential direction;
a modulation ring (3) provided between the inner rotor body (1) and the outer rotor body (2), the modulation ring (3) including a plurality of modulation blocks (30), the plurality of modulation blocks (30) being provided at intervals in a circumferential direction;
the first air groove (4) is arranged on the inner rotor body (1), and at least part of the first air groove (4) is positioned on one side, close to the outer circumferential surface of the inner rotor body (1), of the inner rotor permanent magnet (10);
the first air grooves (4) extend along the circumferential direction of the inner rotor body (1), the number of the first air grooves (4) is multiple, the first air grooves (4) are arranged in pairs, and each pair of the first air grooves (4) is respectively arranged at two ends of the inner rotor permanent magnet (10);
each pair of first air grooves (4) comprises a first side air groove and a second side air groove, the first side air groove is provided with a first side surface, the second side air groove is provided with a second side surface, the first side surface is opposite to the second side surface, and an included angle between the first side surface and the second side surface is theta 1; the central angle corresponding to the side surface of the inner rotor permanent magnet (10) facing the central direction of the inner rotor body (1) is theta 2; wherein theta 1/theta 2 is more than or equal to 0.16 and less than or equal to 0.72.
2. The magnetic gear according to claim 1, wherein the first air groove (4) extends toward a middle direction of the inner rotor permanent magnet (10), and a distance Δ R1 between a groove wall surface of the first air groove (4) near the outer circumferential surface of the inner rotor body (1) and the outer circumferential surface of the inner rotor body (1).
3. The magnetic gear according to claim 2, wherein the first air groove (4) includes two first and second groove wall surfaces which are oppositely disposed in a radial direction of the inner rotor body (1), a distance ar 3 between the first and second groove wall surfaces; the radius of the inner rotor body (1) is R1; the minimum distance between the inner rotor permanent magnet (10) and the circle center of the inner rotor body (1) is L1, and the thickness of the inner rotor permanent magnet (10) is PD 1;
wherein, the Delta R3/(R1-L1-PD1) is more than or equal to 0.15 and less than or equal to 0.35.
4. The magnetic gear of claim 2, further comprising:
and at least part of the second air groove (5) is arranged between two adjacent inner rotor permanent magnets (10), and the second air groove is sunken towards the central direction of the inner rotor body (1).
5. The magnetic gear according to claim 4, wherein the distance between the side wall surface of the second air slot (5) and the side surface of the inner rotor permanent magnet (10) is Δ R2, and Δ R2/Δ R1 is in the range of 0.75 to 1.25.
6. The magnetic gear according to claim 5, wherein the second air groove (5) includes a third groove wall surface and a fourth groove wall surface which are oppositely disposed in a circumferential direction of the inner rotor body (1), a minimum distance between the third groove wall surface and the fourth groove wall surface being D1; the radial section of the inner rotor permanent magnet (10) is rectangular, the length of the inner rotor permanent magnet (10) is PW1, and the central angle corresponding to the side surface of the inner rotor permanent magnet (10) facing the center direction of the inner rotor body (1) is theta 2; the number of pole pairs of the plurality of inner rotor permanent magnets (10) is P1;
wherein, the ratio of [ 2 xD 1 xsin (theta 2/2) ] to [ PW1 xsin [ pi-theta 2 xP 1)/(2 xP 1) ] is less than or equal to 0.7 and less than or equal to 0.9.
7. The magnetic gear of claim 6, wherein θ 2 XP 1/π is in the range of 0.9-0.92.
8. The magnetic gear according to any of claims 1 to 7, characterized in that the radial cross section of the inner rotor body (1) is circular, the inner radius of the circular ring is R2, the outer radius of the circular ring is R1, the thickness of the inner rotor permanent magnet (10) is PD1, and the value range of PD 1/(R1-R2) is 0.1-0.3.
9. The magnetic gear according to any one of claims 1 to 7, wherein a minimum distance between the inner rotor permanent magnet (10) and a center of the inner rotor body (1) is L1, a radial cross section of the inner rotor body (1) is a circular ring, an inner radius of the circular ring is R2, and a value range of L1/(L1-R2) is 1.7-1.8.
10. The magnetic gear according to any one of claims 1 to 7, wherein two adjacent modulation blocks (30) are connected through a magnetic bridge (31), the radial cross sections of the modulation blocks (30) and the magnetic bridge (31) are both in a sector ring shape, the sum of the central angle of the radial cross section of the modulation block (30) and the central angle of the radial cross section of the magnetic bridge (31) is θ 3, and the central angle of the modulation block (30) is θ 4, and 0.35 ≦ θ 4/θ 3 ≦ 0.7.
11. The magnetic gear according to any one of claims 1 to 7, wherein the outer radius of the modulation ring (3) is R3, the radial cross section of the modulation block (30) is a sector ring shape, the sector ring shape corresponds to a central angle θ 4, and the thickness of the modulation block (30) in the radial direction is MD 1; the number of the modulation blocks (30) is P3, the number of the pole pairs of the inner rotor permanent magnets (10) is P1, the number of the modulation blocks (30) corresponding to one inner rotor permanent magnet (10) is P3/(2 xP 1), and the sum of the total area of the radial cross sections of the inner rotor permanent magnets (10) and the total area of the radial cross sections of the modulation blocks (30) is SPM1(ii) a Wherein [ P3 × (θ 4 × R3 × MD1) ]/S is not less than 0.7PM1≤0.85。
12. The magnetic gear according to claim 11, wherein the outer radius of the modulation ring (3) is R3, the thickness of the outer rotor permanent magnet (20) in the radial direction of the outer rotor body (2) is PD2, the distance between the modulation block (30) and the outer rotor permanent magnet (20) is Δ G1, the radial cross section of the outer rotor permanent magnet (20) is a sector ring shape, and the sector ring shape corresponds to a central angle θ 5;
wherein [ PD2 × theta 5/2(R3+ Δ G1+ PD2/2) ] is not less than 0.85/(theta 4 × R3 × MD1) is not more than 1.15.
13. A compound electric machine comprising a magnetic gear, characterised in that the magnetic gear is as claimed in any one of claims 1 to 12.
CN202011376826.XA 2020-11-30 2020-11-30 Magnetic gear and composite motor with same Active CN112615520B (en)

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CN102312986A (en) * 2011-08-18 2012-01-11 东南大学 Outer rotor magnetic flux collecting magnetic gear
KR101537046B1 (en) * 2014-01-28 2015-07-16 동아대학교 산학협력단 Coaxial Magnetic Gear
CN107196434A (en) * 2017-06-21 2017-09-22 珠海格力节能环保制冷技术研究中心有限公司 Rotor assembly and magneto
CN108683321A (en) * 2018-05-03 2018-10-19 华中科技大学 A kind of magnetic geared system of iron yoke fluting
CN110299774A (en) * 2019-08-02 2019-10-01 珠海格力电器股份有限公司 Rotor assembly and magneto
CN110350691A (en) * 2019-08-02 2019-10-18 珠海格力电器股份有限公司 Rotor structure, motor and household electrical appliance

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WO2015053005A1 (en) * 2013-10-09 2015-04-16 日立金属株式会社 Magnetic gear unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102312986A (en) * 2011-08-18 2012-01-11 东南大学 Outer rotor magnetic flux collecting magnetic gear
KR101537046B1 (en) * 2014-01-28 2015-07-16 동아대학교 산학협력단 Coaxial Magnetic Gear
CN107196434A (en) * 2017-06-21 2017-09-22 珠海格力节能环保制冷技术研究中心有限公司 Rotor assembly and magneto
CN108683321A (en) * 2018-05-03 2018-10-19 华中科技大学 A kind of magnetic geared system of iron yoke fluting
CN110299774A (en) * 2019-08-02 2019-10-01 珠海格力电器股份有限公司 Rotor assembly and magneto
CN110350691A (en) * 2019-08-02 2019-10-18 珠海格力电器股份有限公司 Rotor structure, motor and household electrical appliance

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