CN206077099U - Motor and its rotor structure - Google Patents

Motor and its rotor structure Download PDF

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Publication number
CN206077099U
CN206077099U CN201620591590.4U CN201620591590U CN206077099U CN 206077099 U CN206077099 U CN 206077099U CN 201620591590 U CN201620591590 U CN 201620591590U CN 206077099 U CN206077099 U CN 206077099U
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CN
China
Prior art keywords
rotor
circular arc
permanent magnet
motor
rotor core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn - After Issue
Application number
CN201620591590.4U
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Chinese (zh)
Inventor
米泽银
张强
陈彬
肖勇
胡余生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd
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Zhuhai Gree Energy Saving Environmental Protection Refrigeration Technology Research Center Co Ltd
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Priority to CN201620591590.4U priority Critical patent/CN206077099U/en
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Abstract

This utility model provides a kind of motor and its rotor structure, by increasing capacitance it is possible to increase motor torque, improves the efficiency of motor, and can reduce torque pulse and back-emf harmonic wave, reduces vibration and the noise of motor.The rotor structure, including rotor core and multiple permanent magnets;Multiple permanent magnet troughs are uniformly arranged on rotor core circumferentially, the permanent magnet is embedded in the permanent magnet trough;Wherein, the broken line that the edge contour of the rotor core includes alternatively distributed first circular arc or is made up of more than two line segments, and the second circular arc;The Q axle axial symmetry of first circular arc or the broken line relative to motor, second circular arc is axial symmetry relative to the D axles of motor, wherein, if the two ends of the central angle or the broken line of first circular arc are θ 1 with the angle of the line in the center of circle of central shaft hole, the radius of the first circular arc or the broken line and the ultimate range in the center of circle are R1, the central angle of the second circular arc is θ 2, and radius is R2, has θ 1<θ 2, R1>R2.

Description

Motor and its rotor structure
Technical field
This utility model is related to technical field of motors, more particularly to a kind of motor and its rotor structure.
Background technology
Interior permanent magnet machines are widely used because which has higher efficiency.At present, the permanent magnet for inserting in rotor Material is generally divided into two kinds, and one kind is ferrite, and one kind is rare-earth Nd-Fe-B.
In the rotor using ferrite permanent-magnet materials, due to the remanent magnetism of ferrite permanent-magnet materials it is relatively low, HCJ Also less, in order to produce enough torques, the area and thickness that permanent magnetism is carried is larger.So allow for permanent magnetism carry materials'use amount compared with Many, the consumption of stalloy and copper cash is also larger.
In the rotor using Nd-Fe-B permanent magnet material, the torque of generation is big.But the leakage field of this structure permanent magnet is more, Decline the utilization rate of permanent magnet, and torque pulsation is big, iron loss is also big.And the lamination structure of its rotor to the performance of motor and The noise of compressor has significantly impact.
In addition, existing rotor structure is as shown in figure 9, have larger torque pulsation and back-emf harmonic wave.However, excessive pulse Harmonic will badly influence the performance of motor, reduce the efficiency of permagnetic synchronous motor, and cost increases.Also, use this kind The compressor noise of permagnetic synchronous motor and vibration are larger.
Utility model content
In view of this, this utility model provides a kind of motor and its rotor structure, by increasing capacitance it is possible to increase motor torque, improves motor Efficiency, and torque pulse and back-emf harmonic wave can be reduced, reduce vibration and the noise of motor.
According to first aspect of the present utility model, there is provided a kind of rotor structure, including rotor core and multiple permanent magnets;Turn Multiple permanent magnet troughs are uniformly arranged on sub- iron core circumferentially, the permanent magnet is embedded in the permanent magnet trough;Wherein, the rotor The broken line that the edge contour of iron core includes alternatively distributed first circular arc or is made up of more than two line segments, and the second circular arc; The Q axle axial symmetry of first circular arc or the broken line relative to motor, the second circular arc are axial symmetry relative to the D axles of motor, its In, if the two ends of the central angle or the broken line of first circular arc are θ 1 with the angle of the line in the center of circle of central shaft hole, the The radius of one circular arc or the broken line and the ultimate range in the center of circle are R1, and the central angle of the second circular arc is θ 2, and radius is R2, There is θ 1<θ 2, R1>R2.
Further, four permanent magnet troughs are uniformly distributed in rotor core periphery, are embedded in each described permanent magnet trough A piece of permanent magnet.
Further, if P is number of pole-pairs, then 180 °/4P<θ1<180 °/2P, 0.65<R1/R2<0.85.
Further, first is additionally provided with every bore on the rotor core, be positioned close to Q axles and the first circular arc or institute State the region of the point of intersection of broken line and the second circular arc.
Further, if a is the intersection point of the first circular arc or the broken line and the second circular arc, and described first between bore Distance corresponding to rotor core central angle, then 0 °<a<5°.
Further, described first formed every magnetic bridge between the outer rim of bore and the rotor core.
Further, the thickness of a piece of stalloy should be more than every the thickness of magnetic bridge.
Further, the rotor core also includes being separately positioned on the opening of the permanent magnet trough both sides and along vertical In the direction of permanent magnet trough extend second every bore.
Further, the opening be go to the bottom near rotor core central shaft hole it is trapezoidal.
Further, trapezoidal opening to the distance at the edge of the central shaft hole be W, then W>2mm.
According to second aspect of the present utility model, there is provided a kind of motor, including the rotor structure of any of the above-described.
By rotor magnetic circuit according to said structure design above-mentioned rotor structure of the present utility model, can be optimized, improve fixed Sub- tooth boot portion degree of saturation, makes magnetic flux be flowed in stator tooth as far as possible, lifting motor torque, and the rotor structure is reduced The torque pulsation that causes because of the difference of ac-dc axis magnetic resistance, by reducing torque pulsation so as to reduce noise.Specifically, pass through Do not wait air gap rotor outer circle and to the restriction every bore size positions, optimize rotor magnetic circuit, lift electrical efficiency, reduce noise of motor And vibration.Motor torque improves 10%, and torque pulsation declines 43%, and 5 subharmonic of induction electromotive force reduces by 50%.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model Art means, and being practiced according to the content of description, with preferred embodiment of the present utility model and coordinate accompanying drawing detailed below Describe in detail bright as after.
Description of the drawings
The accompanying drawing for constituting a part of the present utility model is used for providing further understanding to of the present utility model, and this practicality is new The schematic description and description of type is used to explain this utility model, does not constitute to improper restriction of the present utility model. In accompanying drawing:
Fig. 1 shows the structural representation that rotor structure is preferable to carry out according to this utility model one;
Fig. 2 shows the schematic diagram of the radius and angle according to rotor structure described in the utility model;
Fig. 3 shows the schematic diagram according to the first of rotor structure described in the utility model every the relative dimensions of bore;
Fig. 4 show according to the opening of rotor structure described in the utility model and second every bore schematic diagram;
Fig. 5 is shown according to another structural representation for being preferable to carry out rotor structure of this utility model;
Fig. 6 is the motor torque comparison diagram of prior art and this utility model scheme;
Fig. 7 is the back-emf and back-emf FFT waveforms of prior art and this utility model scheme;
Fig. 8 (a), 8 (b) respectively illustrate the sense of the induction electromotive force harmonic content and this utility model scheme of prior art Answer electromotive force harmonic content;And
Fig. 9 shows the structural representation of existing rotor.
Specific embodiment
It is to make the purpose of this utility model, technical scheme and advantage clearer, concrete below in conjunction with this utility model Embodiment and corresponding accompanying drawing are clearly and completely described to technical solutions of the utility model.Obviously, described embodiment Only it is a part of embodiment of this utility model, rather than the embodiment of whole.Based on the embodiment in this utility model, this area The every other embodiment obtained under the premise of creative work is not made by those of ordinary skill, belongs to this utility model The scope of protection.
First, it is known that the coordinate system set up on rotor, this coordinate system and rotor synchronous axial system, take Rotor field direction (on the centrage of rotor magnetic pole) is the D axles, perpendicular to rotor field direction (i.e. two adjacent poles it Between perpendicular bisector on) for Q axles, D axles and Q axles constitute the d-axis and quadrature axis of motor.
According to the rotor structure of the present utility model, including rotor core and multiple permanent magnets.Along circle on rotor core It is formed uniformly multiple permanent magnet troughs week, the permanent magnet is embedded in the permanent magnet trough.Further, the rotor core is outer Circle includes alternatively distributed first circular arc or by more than two using non-completely circular structure, i.e., the edge contour of described rotor core The Q axle axial symmetry of the broken line that line segment is constituted, and the second circular arc, the first circular arc or the broken line relative to motor, the second circular arc It is axial symmetry relative to the D axles of motor, wherein, if the center of circle of first circular arc (i.e. relative to the centrosymmetric circular arc of Q axles) The two ends of angle or the broken line are θ 1, the radius of the first circular arc or the broken line with the angle of the line in the center of circle of central shaft hole 10 It is R1 with the ultimate range in the center of circle, the central angle θ 2 of the second circular arc (i.e. relative to the centrosymmetric circular arc of D axles), radius is R2, has θ 1<θ 2, R1>R2.
In prior art rotor structure, although as the permanent magnet using NdFeB material can increase magnetic flux, improve The torque output capability of motor, but also cause leakage field many simultaneously, stator tooth boot portion degree of saturation increases, and causes motor iron loss to increase Greatly.Also, ac-dc axis magnetic circuit reluctance differs greatly, cause motor torque ripple big, noise increase.And adopt of the present utility model Above-mentioned rotor structure, can optimize rotor magnetic circuit, improve stator tooth boot portion degree of saturation, make magnetic flux be flowed into stator as far as possible In tooth, lifting motor torque, and the rotor structure reduces the torque pulsation caused because of the difference of ac-dc axis magnetic resistance, passes through Torque pulsation is reduced so as to reduce noise.
The rotor structure according to one preferred implementation of this utility model is illustrated referring to Fig. 1, Fig. 2.As shown in figure 1, The rotor structure R includes rotor core 1 and multiple permanent magnets 2.Multiple permanent magnet troughs are formed uniformly on rotor core 1 circumferentially 11, the permanent magnet 2 is embedded in the permanent magnet trough 11.Further, as shown in Fig. 2 the rotor core adopts non-full circle And constitute, i.e. the edge contour of the rotor core 1 includes the first circular arc A of alternatively distributed two kinds of different radiis With the second circular arc B, it is axial symmetry that first, second circular arc A and B is respectively relative to the Q axles and D axles of motor, wherein, if described first The central angle of circular arc A (i.e. relative to the centrosymmetric circular arc of Q axles) is θ 1, and radius is R1, and the second circular arc B is (i.e. relative in D axles The symmetrical circular arc of the heart) central angle θ 2, radius is R2, has θ 1<θ 2, R1>R2.
In the rotor structure shown in Fig. 1, Fig. 2, four permanent magnet troughs 11 are uniformly distributed in rotor core periphery, at each The permanent magnet trough 11 is embedded in a piece of permanent magnet 2.Each group permanent magnet 2 is alternately arranged in N, S in rotor core circumferencial direction. However, the setting of permanent magnet trough and corresponding permanent magnet quantity is exemplary only herein, this utility model is not limited to this.And root Understand according to above description, the rotor structure is adopted, i.e. the cylindrical above two various outer diameter of rotor structure 1 First circular arc A and the second circular arc B is alternately constituted.
Thus, rotor structure of the present utility model has this road of rotor of optimization, improves stator tooth boot portion degree of saturation, Magnetic flux is flowed in stator tooth as far as possible, improve the torque of motor, and the rotor structure is reduced because of ac-dc axis magnetic The difference of resistance and the torque pulsation that causes, by reducing torque pulsation so as to reduce noise.Below in conjunction with this reality of description of the drawings With new beneficial effect.
Preferably, if 180 °/4P<θ1<180 °/2P, 0.65<R1/R2<0.85, wherein, P is number of pole-pairs.By so setting Count the structure of the rotor structure R, optimize the magnetic circuit effect of the rotor structure, so as to lifting motor output torque and its Reduce torque pulsation, the efficiency of lifting motor.
It is further preferred that as shown in figure 3, being additionally provided with first every bore on the rotor core 1 of the rotor structure R 12, the region being positioned close at the intersection point M of Q axles and the first circular arc A and the second circular arc B.By arranging this first every bore 12 Magnetic circuit can be further affected to move towards.And further, if 0 °<a<5 °, wherein, a is the first circular arc A and the second circular arc B Intersection point M with described first every the rotor core central angle corresponding to the distance between bore 12.Arranging this first can every bore 12 To affect magnetic field which is distributed according to certain rules, further optimize magnetic circuit, so as to effectively reduce the high order of induction electromotive force Harmonic wave.
Also, in the rotor structure R shown in Fig. 3, described first between the outer rim of bore 12 and the rotor core 1 Formed every magnetic bridge 13.And preferably, every magnetic bridge 13 thickness L more than a piece of stalloy depth information under, every magnetic bridge 13 Thickness should be as little as possible.Wherein, the thickness of the stalloy for being adopted is typically larger than 0.3mm.Now, the machinery of rotor can be met Intensity, can reduce brow leakage again.
It is further preferred that as shown in figure 4, the rotor core 1 of the rotor structure R also includes being separately positioned on permanent magnet The opening 14 of 11 both sides of groove and along second extended perpendicular to the direction of permanent magnet trough every bore 15.Thus, increased described The heat-dissipating space of rotor structure R, improves heat-sinking capability, so as to reduce internal rotor temperature;Also, tapping pcrmeability is relative In stalloy very little, guiding magnetic circuit trend, reduce leakage field, further increase the efficiency of motor.Preferably, the opening 14 For go to the bottom near rotor structure R central shaft hole 10 it is trapezoidal.And it is highly preferred that trapezoidal opening 14 arrives central shaft hole 10 The distance at closest edge be W, then W>2mm.It is so designed that, ensure that the mechanical strength of rotor punching.
Another preferred embodiment of rotor structure R of the present utility model is illustrated with reference to Fig. 5.As shown in figure 5, comparing figure Embodiment shown in 1, in the present embodiment, the broken line C constituted using two ends above line segment replaces above-mentioned first circular arc A.Remaining with Previous embodiment is identical, and here is not repeated.It is according to the rotor structure, similar with above-described embodiment, it is also possible to optimize magnetic circuit, drop The torque pulsation of low motor, improves electric efficiency.
Additionally, this utility model also provides a kind of motor, including above-mentioned rotor structure.
Beneficial effect acquired by the rotor structure R of the present utility model is illustrated referring to Fig. 6 to 8 (a) and 8 (b).
Fig. 6 is torque versus' figure of prior art and this utility model scheme, as seen from Figure 6, new using this practicality The motor torque of type rotor structure is obviously improved, and torque pulsation declines to a great extent.Compared to prior art, torque magnification 10%, turn Square pulsation declines 43%.
Fig. 7 is the back-emf and back-emf FFT waveforms of prior art and this utility model scheme, as seen from Figure 7, is adopted The counter potential waveform of rotor structure of the present utility model, motor is used substantially to tend to sinusoidalization.
Fig. 8 (a), 8 (b) respectively illustrate the sense of the induction electromotive force harmonic content and this utility model scheme of prior art Answer electromotive force harmonic content.By Fig. 8 (a), 8 (b) as can be seen that 5 subharmonic of induction electromotive force reduces by 50%.
Above rotor structure of the present utility model and motor are described.By designing this according to said structure description The above-mentioned rotor structure of utility model, can optimize rotor magnetic circuit, improve stator tooth boot portion degree of saturation, make magnetic flux as far as possible Be flowed in stator tooth, lifting motor torque, and the rotor structure reduce cause because of the difference of ac-dc axis magnetic resistance turn Square is pulsed, by reducing torque pulsation so as to reduce noise.Specifically, by not grade air gap rotor outer circle and to every bore size The restriction of position, optimizes rotor magnetic circuit, lifts electrical efficiency, reduces noise of motor and vibration.Motor torque improves 10%, torque arteries and veins Dynamic to decline 43%, 5 subharmonic of induction electromotive force reduces by 50%.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase Mutually combine.
The above, is only preferred embodiment of the present utility model, not makees any formal to this utility model Restriction, any simple modification, equivalent variations and modification above example made according to technical spirit of the present utility model, Still fall within the range of technical solutions of the utility model.

Claims (11)

1. a kind of rotor structure, including rotor core and multiple permanent magnets;
Multiple permanent magnet troughs are uniformly arranged on rotor core circumferentially, the permanent magnet is embedded in the permanent magnet trough;
The broken line that the edge contour of the rotor core includes alternatively distributed first circular arc or is made up of more than two line segments, With the second circular arc;
The Q axle axial symmetry of first circular arc or the broken line relative to motor, the second circular arc are axle pair relative to the D axles of motor Claim,
Wherein, if the two ends of the central angle or the broken line of first circular arc with the angle of the line in the center of circle of central shaft hole are The ultimate range in θ 1, the radius of the first circular arc or the broken line and the center of circle is R1, and the central angle of the second circular arc is θ 2, radius For R2, there is θ 1<θ 2, R1>R2.
2. rotor structure as claimed in claim 1, wherein,
Four permanent magnet troughs are uniformly distributed in rotor core periphery, a piece of permanent magnet are embedded in each described permanent magnet trough.
3. rotor structure as claimed in claim 1 or 2, wherein,
If P is number of pole-pairs, then 180 °/4P<θ1<180 °/2P, 0.65<R1/R2<0.85.
4. rotor structure as claimed in claim 1, wherein,
First is additionally provided with the rotor core every bore, Q axles and the first circular arc or the broken line and second is positioned close to The region of the point of intersection of circular arc.
5. rotor structure as claimed in claim 4, wherein,
It is if a is the intersection point of the first circular arc or the broken line and the second circular arc, corresponding every the distance between bore with described first Rotor core central angle, then 0 °<a<5°.
6. the rotor structure as described in claim 4 or 5, wherein,
Described first forms every magnetic bridge between the outer rim of bore and the rotor core.
7. rotor structure as claimed in claim 6, wherein,
The thickness of a piece of stalloy should be more than every the thickness of magnetic bridge.
8. rotor structure as claimed in claim 4, wherein,
The rotor core also includes being separately positioned on the opening of the permanent magnet trough both sides and along perpendicular to permanent magnet trough The second of direction extension is every bore.
9. rotor structure as claimed in claim 8, wherein,
The opening be go to the bottom near rotor core central shaft hole it is trapezoidal.
10. rotor structure as claimed in claim 9, wherein,
Trapezoidal opening to the distance at the closest edge of the central shaft hole be W, then W>2mm.
A kind of 11. motors, including the rotor structure described in any one of claim 1-10.
CN201620591590.4U 2016-06-15 2016-06-15 Motor and its rotor structure Withdrawn - After Issue CN206077099U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620591590.4U CN206077099U (en) 2016-06-15 2016-06-15 Motor and its rotor structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620591590.4U CN206077099U (en) 2016-06-15 2016-06-15 Motor and its rotor structure

Publications (1)

Publication Number Publication Date
CN206077099U true CN206077099U (en) 2017-04-05

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Family Applications (1)

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Country Status (1)

Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106169822A (en) * 2016-06-15 2016-11-30 珠海格力节能环保制冷技术研究中心有限公司 Motor and rotor structure thereof
CN109962545A (en) * 2017-12-26 2019-07-02 上海海立电器有限公司 Rotor and its compressor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106169822A (en) * 2016-06-15 2016-11-30 珠海格力节能环保制冷技术研究中心有限公司 Motor and rotor structure thereof
CN106169822B (en) * 2016-06-15 2018-11-02 珠海格力节能环保制冷技术研究中心有限公司 Motor and its rotor structure
CN109962545A (en) * 2017-12-26 2019-07-02 上海海立电器有限公司 Rotor and its compressor

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Granted publication date: 20170405

Effective date of abandoning: 20181102