CN103501067B - The rotor of motor - Google Patents
The rotor of motor Download PDFInfo
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- CN103501067B CN103501067B CN201310441556.XA CN201310441556A CN103501067B CN 103501067 B CN103501067 B CN 103501067B CN 201310441556 A CN201310441556 A CN 201310441556A CN 103501067 B CN103501067 B CN 103501067B
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Abstract
The invention discloses the rotor of a kind of motor, comprising: rotor core；Organize permanent magnet more, described many group permanent magnets are embedded in described rotor core, each group of permanent magnet includes the multiple Permanent-magnet layer being arranged at distances from one another along the radial direction of described rotor core, the nearest Permanent-magnet layer of the external peripheral surface away from described rotor core in the plurality of Permanent-magnet layer is ferrite permanent magnet layer, and remaining Permanent-magnet layer in the plurality of Permanent-magnet layer is rare-earth Nd-Fe-B permanent magnet layer.The rotor of the motor of the present invention can be while increasing the reluctance torque of motor, also the electromagnetic torque of motor is increased, thus improve the efficiency of motor, and also it is not result in that the cost of motor increases, also it is not result in the problem that the noise of motor, vibration deteriorate.Additionally can ensure that the reliability of motor running and the most also can stably operate.
Description
Technical field
The present invention relates to motor technology field, particularly to the rotor of a kind of motor.
Background technology
At present, in the rotor of the motor made at high magnetic conductive material, for output torque and the effect of lifting motor
Rate, typically has the many groups of permanent magnets being embedded in rotor core, and often group permanent magnet includes radially arranged 2 or 3
Individual Permanent-magnet layer, such rotor has the advantages that to make full use of reluctance torque, with the output torque of lifting motor and
Efficiency.
But, in the prior art, the rotor of a kind of motor as shown in Figure 1, although motor cogging torque has
Increased, and represented the Pn* ψ a*Iq of electromagnetic torque, due to the inherent character that remanent magnetism Br in Ferrite Material is relatively low,
Causing the magnetic flux ψ a interlinked with motor stator relatively low, under electromagnetic torque is relatively low, thus total torque T increases little,
The improved efficiency of motor is undesirable, it addition, coercivity is relatively low in Ferrite Material, and the demagnetization penalty of motor,
When motor suffers unusual service condition, motor easily lost efficacy, and its reliability the most just cannot ensure.
Additionally, in the prior art, the rotor of another kind of motor as shown in Figure 2, use the rare earth material of high cost
Material, Br is the highest for its remanent magnetism, and the magnetic flux ψ a interlinked with motor stator is higher, thus total electromagnetic torque and motor
Efficiency also can reach preferable state, but the cost of motor is greatly increased, also there will be motor vibration and
The problem of noise penalty, it addition, in the case of motor needs altofrequency operating, due to the remanent magnetism Br of rare earth material
Height, the corresponding increase that the counter electromotive force of motor is proportional with the rising of rotating speed, the power supply causing the external world cannot be by electricity
Stream is injected in motor, thus motor the most just cannot steady running at high frequencies.
In sum, the rotor of existing motor or the improved efficiency of motor can be caused not ideal enough, reliability
Low；The cost that can cause motor is greatly increased, and the vibration of motor and noise penalty problem and electronic occurs
Machine cannot the problem of steady running at high frequencies, therefore, the rotor of existing motor needs to improve.
Summary of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency.
To this end, it is an object of the invention to propose the rotor of a kind of motor, it is possible to increase while the efficiency of motor,
The cost also not resulting in motor increases.
For reaching above-mentioned purpose, the rotor of a kind of motor that embodiments of the invention propose, including: rotor core；
Organizing permanent magnet, described many group permanent magnets are embedded in described rotor core, and each group of permanent magnet includes along described turn more
Multiple Permanent-magnet layer that the radial direction of sub-iron core is arranged at distances from one another, in the plurality of Permanent-magnet layer away from described rotor core
The nearest Permanent-magnet layer of external peripheral surface be ferrite permanent magnet layer, remaining permanent magnet in the plurality of Permanent-magnet layer
Layer is rare-earth Nd-Fe-B permanent magnet layer.
The rotor of motor according to embodiments of the present invention, also can increase while increasing the reluctance torque of motor
The electromagnetic torque of motor, thus improve the efficiency of motor, and also it is not result in that the cost of motor increases, also
It is not result in the problem that the noise of motor, vibration deteriorate.Additionally can ensure that the reliability of motor running and at height
Also can stably operate under frequency.
According to one embodiment of present invention, the multiple Permanent-magnet layer in described each group of permanent magnet are along described rotor core
Radial direction equidistantly spaced from one another.
According to one embodiment of present invention, described many group permanent magnets are uniformly distributed along the circumference of described rotor core.
According to one embodiment of present invention, the Permanent-magnet layer that external peripheral surface away from described rotor core is nearest is circular arc
Shape, and the center of circle of described circular arc is positioned on the external peripheral surface of described rotor core.
According to one embodiment of present invention, each Permanent-magnet layer in remaining Permanent-magnet layer described is divided into and being spaced
The multistage opened.
Wherein, each section has square-section.
Further, the hop count of each Permanent-magnet layer in remaining Permanent-magnet layer described is equal, and each Permanent-magnet layer
The centrage of each section passes through the center of circle of the nearest Permanent-magnet layer of the external peripheral surface away from described rotor core.
According to one embodiment of present invention, the rotor of described motor also includes: multiple permanent magnet putting holes, institute
State Permanent-magnet layer to be respectively correspondingly arranged in described permanent magnet putting hole.
According to one embodiment of present invention, described permanent magnet is four groups.
According to another embodiment of the invention, described permanent magnet is six groups.
Aspect and advantage that the present invention adds will part be given in the following description, and part will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or that add aspect and advantage will become bright from the following description of the accompanying drawings of embodiments
Aobvious and easy to understand, wherein:
Fig. 1 is the end view of a kind of motor rotor in prior art；
Fig. 2 is the end view of another kind of motor rotor in prior art；
When Fig. 3 is current phase change, current value keeps a timing electromagnetic torque, reluctance torque and the relation of total torque
Schematic diagram；
Fig. 4 is the end view of the rotor of the motor according to the embodiment of the present invention；
Fig. 5 is the end view after the rotor of motor and stator combination；And
Fig. 6 is the end view of the rotor of the motor according to another embodiment of the present invention.
Reference:
1: the rotor of motor；
2,2a: permanent magnet, wherein, 2a is the permanent magnet in inner side, and 2 is the permanent magnet in outside；
3: permanent magnet；
4a, 4b, 4c: permanent magnet putting hole；
5: shaft hole；
6: passage；
7: screw hole；
8,8a: permanent magnet, wherein, 8a is the permanent magnet in inner side, and 8 is the permanent magnet in outside；
9: permanent magnet；
11: motor stator.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below by ginseng
The embodiment examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example for realizing the different structure of the present invention.For letter
Changing disclosure of the invention, hereinafter parts and setting to specific examples are described.Certainly, they are the most merely illustrative,
And it is not intended to limit the present invention.Additionally, the present invention can in different examples repeat reference numerals and/or letter.
This repetition is for purposes of simplicity and clarity, between itself not indicating discussed various embodiment and/or arranging
Relation.Additionally, the various specific technique that the invention provides and the example of material, but ordinary skill people
Member is it can be appreciated that the property of can be applicable to of other techniques and/or the use of other materials.It addition, described below first is special
Levy second feature it " on " structure can include that the first and second features are formed as the embodiment directly contacted, it is possible to
To include the embodiment that other feature is formed between the first and second features, such first and second features may not
It it is directly contact.
In describing the invention, it should be noted that unless otherwise prescribed and limit, term " is installed ", " being connected ",
" connect " and should be interpreted broadly, for example, it may be mechanically connected or electrical connection, it is also possible to be the company of two element internals
Logical, can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, for those of ordinary skill in the art
Speech, can understand the concrete meaning of above-mentioned term as the case may be.
Before describing the rotor of the motor proposed according to embodiments of the present invention, electricity the most of the prior art is described first
The rotor of motivation.
In the prior art, as it is shown in figure 1, have a kind of motor rotor include the many groups of permanent magnets being embedded in rotor 2,
2a, often group is included in permanent magnet 2a and another permanent magnet 2 in outside of inner side, and permanent magnet 2a in inner side and
Having certain distance between another permanent magnet 2 in outside, each permanent magnet 2,2a form the arc extended towards rotor center,
Then the interval that magnetic flux is prone between the permanent magnet of inner side and outer side is passed through, and increases q axle inductance, thus except electricity
Also create reluctance torque outside magnetic torque, improve output torque and the efficiency of the motor with this motor rotor.
Additionally, as in figure 2 it is shown, another kind of motor rotor includes many groups of permanent magnets being embedded in rotor 8,8a, often
Group is included in the permanent magnet 8a of inner side and another permanent magnet 8 in outside, and at the permanent magnet 8a of inner side with in outside
Between another permanent magnet 8, there is certain distance.
In the motor with motor rotor described above, may result in each permanent magnet center and rotor center phase
D axial inductance Ld even and in the difference of the q axial inductance Lq turning 90 ° of electrical angles from this d direction of principal axis.
Therefore also creating reluctance torque in addition to the electromagnetic torque of permanent magnet, total torque T is expressed as:
T=Pn × Ψ a × Iq+(Ld-Lq) × Id × Iq} (1)
In formula, Pn represents that number of pole-pairs, Ψ a represent d axle magnetic flux, and Ld represents d axle inductance, and Lq represents q axle inductance, Iq
Representing q shaft current, Id represents d shaft current.Formula (1) represents the voltage equation after dq coordinate transform, wherein
Section 1 is basic electromagnetic torque Pn* ψ a*Iq；Section 2 is reluctance torque Pn* (Ld-Lq) * Id*Iq.
Wherein, Fig. 3 illustrates that when current phase changes current value keeps a timing electromagnetic torque, reluctance torque and total
The relation of torque.As seen from Figure 3, when current phase arrives certain value, the total torque of motor output up to
To maximum.
But, although the reluctance torque of the motor with motor rotor as shown in Figure 1 increased, and represents
The Pn* ψ a*Iq of electromagnetic torque, due to the inherent character that remanent magnetism Br in Ferrite Material is relatively low, causes and motor stator
The magnetic flux ψ a of son interlinkage is relatively low, and under electromagnetic torque is relatively low, thus total torque T increases little, and the efficiency of motor carries
Rising undesirable, it addition, coercivity is relatively low in Ferrite Material, the demagnetization penalty of motor, when motor suffers
During unusual service condition, motor easily lost efficacy, and its reliability the most just cannot guarantee.
Or, another kind of motor rotor as shown in Figure 2, use the rare earth material of high cost, Br is the highest for its remanent magnetism,
The magnetic flux ψ a interlinked with motor stator is higher, so that total electromagnetism with the motor of this motor rotor turns
The efficiency of square and motor also can reach preferable state, but the cost of motor is greatly increased, and also there will be electronic
The vibration of machine and the problem of noise penalty, it addition, in the case of motor needs altofrequency operating, due to rare earth material
The remanent magnetism Br of material is high, the corresponding increase that the counter electromotive force of motor is proportional with the rising of rotating speed, causes the electricity in the external world
Source cannot inject current in motor, thus motor the most just cannot steady running at high frequencies.
The present invention is based on considerations above and proposes the rotor of a kind of motor, has the electricity of the rotor of this motor
Motivation can also increase the electromagnetic torque of motor, thus improve the efficiency of motor while increasing reluctance torque,
But increase without the cost causing motor, be also not result in the problem that the noise of motor, vibration deteriorate, and energy
Guarantee the reliability of motor running and the most stably operate.
The rotor of the motor proposed according to embodiments of the present invention is described with reference to the accompanying drawings.
Fig. 4 is the end view of the rotor of the motor according to the embodiment of the present invention.As shown in Figure 4, this motor
Rotor include rotor core 100 and many group permanent magnets 3,3,9, wherein many group permanent magnets 3,3,9 are embedded in rotor
In iron core 100, each group of permanent magnet includes the multiple Permanent-magnet layer being arranged at distances from one another along the radial direction of rotor core 100,
The nearest Permanent-magnet layer of the external peripheral surface away from rotor core 100 in multiple Permanent-magnet layer is ferrite permanent magnet layer,
Remaining Permanent-magnet layer in multiple Permanent-magnet layer is rare-earth Nd-Fe-B permanent magnet layer.
Wherein, rotor core 100 is made up of steel disc stacking, and generally column.
Specifically, as shown in Figure 4, the permanent magnet in the first Permanent-magnet layer of rotor outer circle perimeter surface is by ferrum oxygen
System becomes, and is disposed with the second Permanent-magnet layer and the 3rd Permanent-magnet layer, the second permanent magnetism between the first Permanent-magnet layer and rotating shaft
Permanent magnet in body layer and the 3rd Permanent-magnet layer is made up of rare-earth Nd-Fe-B.
In an embodiment of the present invention, as shown in Figure 4, the multiple Permanent-magnet layer in each group of permanent magnet are along rotor core
The radial direction of 100 is equidistantly spaced from one another.It is to say, along the radial arrangement of rotor core 100 in each group of permanent magnet
There is between multiple Permanent-magnet layer certain interval, and interval is substantially identical.So, magnetic flux is prone to from each permanent magnetism
Interval between body layer is passed through, and can also increase q axle inductance, thus the electromagnetic torque produced except permanent magnet itself
Reluctance torque can also be produced outward.
According to one embodiment of present invention, as shown in Fig. 4 or Fig. 5, permanent magnet 3,3,9 is four groups.Wherein,
Fig. 5 is the end view after the rotor 1 of motor and stator 11 combination.
According to another embodiment of the invention, as shown in Figure 6, permanent magnet 3,3,9 is six groups.
In an embodiment of the present invention, as shown in Fig. 4, Fig. 5 or Fig. 6, many group permanent magnets are along the week of rotor core 100
To being uniformly distributed.No matter permanent magnet is four groups or six groups, is all to be uniformly distributed along the circumferencial direction of rotor core 100
's.
According to one embodiment of present invention, as shown in Fig. 4, Fig. 5 or Fig. 6, away from the cylindrical weekly form of rotor core 100
Nearest Permanent-magnet layer that is first Permanent-magnet layer in face is circular arc, and the center of circle of circular arc can be located substantially at rotor core 100
External peripheral surface on, it is preferable that the center of circle of circular arc is positioned on the external peripheral surface of rotor core 100.
Wherein, each Permanent-magnet layer the such as second Permanent-magnet layer in remaining Permanent-magnet layer and the 3rd Permanent-magnet layer are divided into
The multistage being spaced apart from each other.Further, each section has square-section, say, that the second Permanent-magnet layer and the 3rd is forever
Permanent magnet in magnet layer be shaped as rectangle, the rare-earth Nd-Fe-B in the i.e. second Permanent-magnet layer and the 3rd Permanent-magnet layer
It is shaped as rectangular configuration.
According to one embodiment of present invention, as shown in Fig. 4, Fig. 5 or Fig. 6, each in remaining Permanent-magnet layer is forever
The hop count of magnet layer that is second Permanent-magnet layer and the 3rd Permanent-magnet layer is equal, and in each section of each Permanent-magnet layer
Heart line passes through the center of circle of the nearest Permanent-magnet layer of the external peripheral surface away from rotor core 100, or, each permanent magnet
The centrage of each section of layer is essentially by the center of circle of the nearest Permanent-magnet layer of the external peripheral surface away from rotor core 100.
According to one embodiment of present invention, as shown in Figure 4, the rotor of above-mentioned motor also includes: multiple permanent magnetism
Body putting hole 4a, 4b, 4c, Permanent-magnet layer is respectively correspondingly arranged in permanent magnet putting hole.
Additionally, as shown in Figure 4, the rotor of above-mentioned motor also includes shaft hole 5, passage 6 and screw hole 7.
The rotor of motor according to embodiments of the present invention, also can increase while increasing the reluctance torque of motor
The electromagnetic torque of motor, thus improve the efficiency of motor, and also it is not result in that the cost of motor increases, also
It is not result in the problem that the noise of motor, vibration deteriorate.Additionally can ensure that the reliability of motor running and at height
Also can stably operate under frequency.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or
Person's feature is contained at least one embodiment or the example of the present invention.In this manual, the signal to above-mentioned term
Property statement be not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or
Feature can combine in any one or more embodiments or example in an appropriate manner.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, permissible
Understand these embodiments can be carried out without departing from the principles and spirit of the present invention multiple change, amendment,
Replacing and modification, the scope of the present invention is limited by claims and equivalent thereof.
Claims (8)
1. the rotor of a motor, it is characterised in that including:
Rotor core；With
Organizing permanent magnet, described many group permanent magnets are embedded in described rotor core, and each group of permanent magnet includes along described more
Multiple Permanent-magnet layer that the radial direction of rotor core is arranged at distances from one another, in the plurality of Permanent-magnet layer away from described rotor ferrum
The Permanent-magnet layer that the external peripheral surface of core is nearest is ferrite permanent magnet layer, remaining permanent magnetism in the plurality of Permanent-magnet layer
Body layer is rare-earth Nd-Fe-B permanent magnet layer；
The nearest Permanent-magnet layer of external peripheral surface away from described rotor core is circular arc, and the center of circle of described circular arc is positioned at
On the external peripheral surface of described rotor core；Each Permanent-magnet layer in remaining Permanent-magnet layer described is divided into and being spaced
The multistage opened.
2. the rotor of motor as claimed in claim 1, it is characterised in that multiple in described each group of permanent magnet
Permanent-magnet layer is equidistantly spaced from one another along the radial direction of described rotor core.
3. the rotor of motor as claimed in claim 1, it is characterised in that described many group permanent magnets are along described rotor
The circumference of iron core is uniformly distributed.
4. the rotor of motor as claimed in claim 1, it is characterised in that each section has square-section.
5. the rotor of motor as claimed in claim 1, it is characterised in that each in remaining Permanent-magnet layer described
The hop count of individual Permanent-magnet layer is equal, and the centrage of each section of each Permanent-magnet layer is by away from described rotor core
The center of circle of the Permanent-magnet layer that external peripheral surface is nearest.
6. the rotor of motor as claimed in claim 1, it is characterised in that also include: multiple permanent magnet putting holes,
Described Permanent-magnet layer is respectively correspondingly arranged in described permanent magnet putting hole.
7. the rotor of motor as claimed in claim 1, it is characterised in that described permanent magnet is four groups.
8. the rotor of motor as claimed in claim 1, it is characterised in that described permanent magnet is six groups.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310441556.XA CN103501067B (en) | 2013-09-25 | 2013-09-25 | The rotor of motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310441556.XA CN103501067B (en) | 2013-09-25 | 2013-09-25 | The rotor of motor |
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| Publication Number | Publication Date |
|---|---|
| CN103501067A CN103501067A (en) | 2014-01-08 |
| CN103501067B true CN103501067B (en) | 2016-10-12 |
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| CN201310441556.XA Active CN103501067B (en) | 2013-09-25 | 2013-09-25 | The rotor of motor |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011442B (en) * | 2016-06-30 | 2022-02-11 | 广东美芝制冷设备有限公司 | Motor rotor and motor and compressor with same |
| CN108988527A (en) * | 2018-06-27 | 2018-12-11 | 德威(苏州)新能源有限公司 | A kind of composite excitation high power density magnetic resistance permanent magnet machine rotor |
| CN110601399A (en) * | 2019-09-12 | 2019-12-20 | 广东上水能源科技有限公司 | Space permanent magnet motor |
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| CN203504323U (en) * | 2013-09-25 | 2014-03-26 | 广东美芝制冷设备有限公司 | Rotor of motor |
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| CN101026318A (en) * | 2005-12-19 | 2007-08-29 | 艾默生电气公司 | Composite magnet structure for rotor |
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