CN103222154B - Ferrite three-section type three-phase permanent-magnet motor - Google Patents
Ferrite three-section type three-phase permanent-magnet motor Download PDFInfo
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- CN103222154B CN103222154B CN201180052956.0A CN201180052956A CN103222154B CN 103222154 B CN103222154 B CN 103222154B CN 201180052956 A CN201180052956 A CN 201180052956A CN 103222154 B CN103222154 B CN 103222154B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
- H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
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- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
A kind of ferrite three-section type three-phase permanent-magnet motor, its stator core is the three stage structure be made up of soft magnetic ferrite, and A, B, C three-phase windings respectively accounts for one section; Wherein stator core has Z=2P=2X between teeth groove number Z, rotor magnetic pole number 2P, wherein X=5,6,7 ... 20; Wherein all around of each tooth all forms the groove for setting-in winding; Each has 2X concentratred winding and mutually by A-& gt; The mode of/A circulates arrangement; B, C phase structure is identical, and space phase mutual deviation 120 ° of electrical degrees of A, B, C threephase stator iron core.This motor has that winding overhang is little, location torque is little, copper loss and the advantage such as iron loss is little.
Description
Technical field
The present invention relates to magneto, more particularly, relate to a kind of ferrite three-section type three-phase permanent-magnet motor, this motor is applicable to the application of refrigerator, air-conditioning and high-speed driving.
Background technology
The stator core of magneto generally adopts silicon steel sheet, and rotor generally adopts rare-earth permanent magnet, such as Nd-Fe-B permanent magnet.Silicon steel sheet and rare-earth permanent magnet material just more and more rare, price is more and more expensive.In order to change this situation, people have done a lot of effort.
Wherein improvement project adopts the motor without stator core, and this kind of design will inevitably increase the consumption of permanent magnet.
Another kind of improvement project adopts hard ferrite magnet steel, can avoid using rare-earth permanent magnet material, but the magnetic loading step-down of motor must be caused, can only correspondingly improve electric loading to make up, so must copper consumption be increased, the copper loss of motor increases, and the more important thing is that therefore the energy index of motor can decline to a great extent.
Summary of the invention
For the above-mentioned defect of existing magneto, the present invention will solve that conventional permanent magnet motor copper loss is large, high in cost of production problem.
Technical scheme of the present invention is, ferrite three-section type three-phase permanent-magnet motor is provided, the rotor core of described motor is equipped with multipair permanent magnet, stator core is equipped with three-phase windings, wherein, described stator core is the three stage structure be made up of soft magnetic ferrite, and A, B, C three-phase windings respectively accounts for wherein one section; Permanent magnet in described rotor core is made up of hard ferrite, its number of magnetic poles 2P=2X, wherein X=5,6,7 ... 20; For the first paragraph stator core at A phase winding place, its teeth groove number Z=2X; Wherein outer nose circle width M11, the interior nose circle width M21 of each tooth, the relation of tooth degree not lend oneself to worry and anxiety M31 are M11 > M21 > M31; And the relation of the outer nose circle axial length M12 of each tooth, interior nose circle axial length M22, tooth heart axial length M32 is M12 > M32, M22 > M32; Thus all form the groove for setting-in winding in all around of tooth; A phase has 2X concentratred winding, and respectively around on 2X tooth, and to circulate arrangement by the mode of A →/A, "/A " wherein represents the concentratred winding of an anti-phase connection of A phase; Second, third section of stator core and the winding construction at described B, C phase winding place are identical with A phase.
In the present invention, the physical air gap between described stator core and rotor core can be 0.2 ~ 3.0mm; The width of the notch between adjacent two teeth is 0.1 ~ 3.0mm.
In each section of stator core of the present invention, the volume resistance of soft magnetic ferrite is 100 Ω ~ 50K Ω, and is selected from the one in Mn-Zn soft magnetic ferrite, Ni-Zn soft magnetic ferrite, microcrystal silicon soft magnetic ferrite or SMC soft-magnetic composite material.
In a preferred version of the present invention, each section of described stator core is spliced by independently 2X tooth, and the remaining surface wherein except splicing surface is all coated by insulating barrier, and the thickness of described insulating barrier is 0.02 ~ 0.5mm.In another preferred version of the present invention, described stator core is be prefabricated into overall integral structure.Each section of described stator core can be divided into multistage again vertically, and the front portion being included in described tooth forms the leading portion of forward recess, forms the back segment of rearward recess and at least one interlude between described leading portion and back segment at the rear portion of described tooth
In the present invention, also can each tooth described interior nose circle Inner arc on be evenly provided with three micro-grooves, the groove width of described micro-groove is 1 ~ 2mm, and groove depth is 0.3 ~ 2mm.
In a preferred version of the present invention, on described rotor core, N, S magnetic pole of each permanent magnet alternately; Each described permanent magnet is watt shape hard ferrite magnet steel of radial magnetizing or watt shape hard ferrite magnet steel of parallel magnetization.
In another preferred version of the present invention, described permanent magnet is the hard ferrite magnetic patch of radial magnetizing, and is flush-mounted in the surface of described rotor core; The pole span of each described magnetic patch is π D/2X, and axial physical size L is 30 ~ 200mm, and wherein D is rotor diameter, and the outer chord length of magnetic patch is π D/2X, and magnetic patch internal diameter is-π D/2Xn, wherein n=1 ~ 3.
In the present invention, the cylindrical of described rotor core can overlap and have a thickness to be the carbon fiber of 0.15 ~ 2mm, glass fiber or aluminium quality guarantee sheath.
Owing to taking technique scheme, three-phase motor with permanent magnets of the present invention has that winding overhang minimizes, air gap minimizes, material minimizes, location torque minimizes and the series of advantages such as iron loss and least copper loss, have more high workload rotating speed, higher power/volume ratio and moment/volume ratio, cost reaches minimumization.This three-phase motor with permanent magnets can substitute existing induction motor, permanent magnet motor, or alternative air-conditioning and freezer compressor drive motors, becomes the main flow drive motors of following high-performance, energy-saving type air conditioner and freezer compressor.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is motor general assembly structural representation in a preferred embodiment of the invention;
Fig. 2 is stator, the rotor structure schematic diagram of motor A phase in a preferred embodiment of the invention;
Fig. 3 is the front view of the single tooth shown in Fig. 2;
Fig. 4 is the left view of single tooth shown in Fig. 3;
Fig. 5 is the structural representation of watt shape hard ferrite magnetic steel rotor in a preferred embodiment of the invention;
Fig. 6 is the rotor structure schematic diagram that the hard ferrite magnetic patch of radial magnetizing in a preferred embodiment of the invention is formed;
Fig. 7 is the schematic diagram arranging micro-groove in another preferred embodiment of the present invention in the Inner arc of tooth;
Every section of stator core is divided into the schematic diagram of three sections by Fig. 8 further vertically in a preferred embodiment of the invention.
Embodiment
Be illustrated in figure 1 a preferred embodiment of the present invention, the critical piece of this ferrite three-section type three-phase permanent-magnet motor comprises rotor 1, stator 2, rotating shaft 30 etc., and the physical air gap 5 between rotor 1 and stator 2 is 0.1 ~ 2mm.Stator core is wherein the three stage structure be made up of soft magnetic ferrite, and A, B, C three-phase windings respectively accounts for wherein first, second, third section;
In embodiment below, get X=6, so there is Z=2P=2X=12; During concrete enforcement, also desirable X=5,6,7 ... arbitrary numerical value in 20.As shown in Figure 2, be all described for A phase in description below, first paragraph stator core is combined into by 12 teeth 40 that independently soft magnetic ferrite is made, so the teeth groove number Z=12 of stator.
As shown in Figure 3 and Figure 4, wherein width M11, the width M21 of interior nose circle 60 of the outer nose circle 50 of each tooth 40, the relation of the width M31 of the tooth heart 70 are M11 > M21 > M31; And the relation of the axial length M22 of the axial length M12 of the outer nose circle 50 of each tooth, interior nose circle 60, the axial length M32 of the tooth heart 70 is M12 > M32, M22 > M32; Thus at the axis of tooth and radial front and back groove, the left and right groove all formed for placing winding; The benefit of this structure is that winding is all loaded in groove, and desirable state is the left and right end face that winding can not protrude from Fig. 3, and namely the thickness of winding is defined in the left and right groove of tooth; Winding also can not protrude from left and right end face in Fig. 4 simultaneously, and namely the length of winding is defined in the front and back groove of tooth.
Wherein, A phase has 12 concentratred winding, and respectively around on 12 teeth, the coiling connected mode of A phase winding is A →/A → A →/A → A →/A → A →/A → A →/A → A →/A."/A " wherein represents the concentratred winding of an anti-phase connection of A phase.
Second, third section of stator core and the winding construction at described B, C phase winding place are identical with A phase, and space phase mutual deviation 120 ° of electrical degrees of A, B, C threephase stator iron core.The coiling connected mode of B phase winding is B →/B → B →/B → B →/B → B →/B → B →/B → B →/B; The coiling connected mode of C phase winding is C →/C → C →/C → C →/C → C →/C → C →/C → C →/C.
Due to the front and back groove on each tooth, left and right groove structure, concentratred winding outward flange is all defined to stator core inside, compared with conventional motors, this motor saves a large amount of winding conducting wires, significantly reduce with copper with by iron, thus there is higher power/volume ratio, higher moment/volume ratio, cost reaches minimumization.
For the 12 pole motors that rotor axial L/D ratio is 1/2, motor axial length L=D/2, the every pole number of turn N of motor, then the total length of the every phase winding of motor is 12N (D+ л D/12), and the total length 12N of the every phase winding of conventional motors (D+2 л D/12); Therefore, in the present embodiment, winding conducting wire has shortened 1.207 times.Wherein, rotor adopts hard ferrite, avoids using rare-earth permanent magnet material, although the magnetic loading of motor can be caused to decline 2 times, need raising 2 times of electric loadings to make motor performance up, but shorten 1.207 times due to the total length of winding, the copper loss of motor can corresponding reduction 1.458 times; Again because the stator of motor adopts soft magnetic ferrite, the iron loss of motor can reduce 3 ~ 10 times, and therefore, the composite loss of this motor is suitable, even less with traditional concentratred winding three-phase motor with permanent magnets; Again because motor magnetic loading declines 2 times, thus the location torque of motor and torque fluctuations less by about 20 ~ 30% than traditional concentratred winding motor, noise is also little than traditional concentratred winding motor; The copper consumption of motor reduces, to the internal resistance of reduction motor advantageously.
Because stator core have employed soft magnetic ferrite, operating frequency, up to 10KHz, can allow motor to rotate with tens thousand of speed of walking around per minute, for high-speed applications highly significant.This motor can adopt three-phase square wave or sine-wave current to drive.
During concrete enforcement, for in 12 teeth of each section of stator core, the remaining surface except splicing surface is all coated by insulating barrier, and thickness of insulating layer can be 0.02 ~ 0.5mm, after being spliced into, the width of the notch 3 between adjacent two teeth is 0.1 ~ 3.0mm.Wherein, the volume resistance of soft magnetic ferrite can be 100 Ω ~ 50K Ω, therefore the core loss of soft magnetic ferrite stator less than silicon steel sheet stator core 3 ~ 10 times even more.Here soft magnetic ferrite can be Mn-Zn soft magnetic ferrite, a certain in Ni-Zn soft magnetic ferrite, microcrystal silicon soft magnetic ferrite or SMC soft-magnetic composite material is made, the remanent magnetism magnetic that its saturation magnetic induction must be not less than permanent-magnet ferrite is close, and they are natural couplings.
For the stator core shown in Fig. 2, certain technique in sintering process, bonding process, injection technique, hybrid technique can be adopted to make independent tooth one by one, the winding now can connected forward or backwards for each tooth coiling, and then be spliced into one section of overall stator core assemblies.In embodiment as shown in Figure 7, the Inner arc of the interior nose circle of each tooth is evenly provided with three micro-grooves, its groove width is 1 ~ 2mm, and groove depth is 0.3 ~ 2mm.
Certainly, also integral prefabricated mode can be adopted make one section of stator core (now not having independently each tooth), then direct with flying shuttle or manual coiling three-phase windings on one-piece stator iron core.
In embodiment as shown in Figure 5, on rotor core, N, S magnetic pole of each permanent magnet alternately, and permanent magnet is here watt shape hard ferrite magnet steel of radial magnetizing or watt shape hard ferrite magnet steel of parallel magnetization.As can be seen from the figure, the cylindrical both sides of ferrite magnetic steel have be not more than 15 °, length is not more than the top rake of the cylindrical arc length 1/4 of ferrite magnetic steel, as Fig. 5.The direct axis reluctance of this rotor is identical with quadrature-axis reluctance, belongs to non salient pole machine, and the running noises of this motor is less than salient pole machine.
In embodiment as shown in Figure 6, permanent magnet is the hard ferrite magnetic patch of radial magnetizing, the pole span π D/12 of this permanent magnet, axial physical size L is 30 ~ 200mm, and wherein D is rotor diameter, and the outer chord length of magnetic patch is π D/12, magnetic patch internal diameter is-π D/12n, n=1 ~ 3.It is the rotor be made up of the hard ferrite magnetic patch of the radial magnetizing of n=1.25 shown in Fig. 6.Permanent magnet shown in Fig. 6, the direct axis reluctance of rotor is larger than quadrature-axis reluctance, has saliency, can obtain salient pole moment, exert oneself larger than non salient pole machine when this motor runs.
As shown in Figure 2, in the present embodiment, on the cylindrical of rotor, cover has a thickness to be the protective sleeve of 0.15 ~ 2mm, and this protective sleeve can be made up of carbon fiber, glass fiber or aluminium, epitrochanterian permanent magnet centrifugal force can be prevented excessive and come off when motor High Rotation Speed.
As shown in Figure 8, another embodiment of the present invention, each section of stator core is divided into three sections vertically further, and the front portion being included in tooth forms the leading portion (the left side section in Fig. 8) of forward recess, forms the back segment (the right side section in Fig. 8) of rearward recess and the interlude (interlude in Fig. 8) between leading portion and back segment at the rear portion of tooth.During concrete enforcement, the quantity of interlude can be one or more; When the length of present segment and back segment immobilizes, by increasing the quantity of interlude, or regulate the length of interlude, i.e. the axial length of adjustable whole stator core.The structure of this axial segmentation is applicable to the situation that the multiple teeth shown in Fig. 2 are spliced into stator core, namely each tooth in each section of stator core is divided into multistage, shown in Fig. 8 is the left view structure of the single tooth corresponding with Fig. 4, and its front view structure as shown in Figure 3; Certainly, the structure of this axial segmentation is also applicable to integral prefabricated stator core, is now the integral prefabricated multistage of difference.
Ferrite three-section type three-phase permanent-magnet motor in above-described embodiment, is typically used as motor, and adopts three-phase square wave or sine-wave current to drive; Be applicable to the application of refrigerator, air-conditioning and high-speed driving; When it is driven by rotating machinery, also three-phase permanent magnet electricity generator can be become.
Claims (7)
1. a ferrite three-section type three-phase permanent-magnet motor, the rotor core (1) of described motor is equipped with multipair permanent magnet (4), (2) are equipped with three-phase windings to stator core, it is characterized in that, described stator core is the three stage structure be made up of soft magnetic ferrite, and A, B, C three-phase windings respectively accounts for wherein one section; Permanent magnet in described rotor core is made up of hard ferrite, its number of magnetic poles 2P=2X, wherein X=5,6,7 ... 20; For the first paragraph stator core at A phase winding place, its teeth groove number Z=2X; Wherein outer nose circle width M11, the interior nose circle width M21 of each tooth, the relation of tooth degree not lend oneself to worry and anxiety M31 are M11 > M21 > M31; And the relation of the outer nose circle axial length M12 of each tooth, interior nose circle axial length M22, tooth heart axial length M32 is M12 > M32, M22 > M32; Thus all form the groove for setting-in winding in all around of tooth; A phase has 2X concentratred winding, and respectively around on 2X tooth, and to circulate arrangement by the mode of A →/A, "/A " wherein represents the concentratred winding of an anti-phase connection of A phase; Second, third section of stator core and the winding construction at described B, C phase winding place are identical with A phase, and space phase mutual deviation 120 ° of electrical degrees of A, B, C threephase stator iron core;
Physical air gap between described stator core and rotor core is 0.2 ~ 3.0mm; The width of the notch (3) between adjacent two teeth is 0.1 ~ 3.0mm; On the cylindrical of described rotor core, cover has a thickness to be the carbon fiber of 0.15 ~ 2mm, glass fiber or aluminium quality guarantee sheath;
The volume resistance of described soft magnetic ferrite is 100 Ω ~ 50K Ω, and is selected from the one in Mn-Zn soft magnetic ferrite, Ni-Zn soft magnetic ferrite, microcrystal silicon soft magnetic ferrite or SMC soft-magnetic composite material.
2. ferrite three-section type three-phase permanent-magnet motor according to claim 1, it is characterized in that, each section of described stator core is spliced by independently 2X tooth, and the remaining surface wherein except splicing surface is all coated by insulating barrier, and the thickness of described insulating barrier is 0.02 ~ 0.5mm.
3. ferrite three-section type three-phase permanent-magnet motor according to claim 1, is characterized in that, each section of described stator core is be prefabricated into overall integral structure, and its surface is all coated by insulating barrier, and the thickness of described insulating barrier is 0.02 ~ 0.5mm.
4. ferrite three-section type three-phase permanent-magnet motor according to any one of claim 1-3, is characterized in that, on described rotor core, N, S magnetic pole of each permanent magnet alternately; Each described permanent magnet is watt shape hard ferrite magnet steel of radial magnetizing or watt shape hard ferrite magnet steel of parallel magnetization.
5. ferrite three-section type three-phase permanent-magnet motor according to claim 4, is characterized in that, the cylindrical both sides of described ferrite magnetic steel be provided be not more than 15 °, length is not more than the top rake of the cylindrical arc length 1/4 of ferrite magnetic steel.
6. the ferrite three-section type three-phase permanent-magnet motor according to any one of claim 1-3, is characterized in that, the Inner arc of the interior nose circle of each tooth described is evenly provided with three micro-grooves, and the groove width of described micro-groove is 1 ~ 2mm, and groove depth is 0.3 ~ 2mm.
7. the ferrite three-section type three-phase permanent-magnet motor according to any one of claim 1-3, it is characterized in that, each section of described stator core is divided into multistage again vertically, and the front portion being included in described tooth forms the leading portion of forward recess, forms the back segment of rearward recess and at least one interlude between described leading portion and back segment at the rear portion of described tooth.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2011/071690 WO2012119317A1 (en) | 2011-03-10 | 2011-03-10 | Ferrite three-section three-phase permanent magnet motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103222154A CN103222154A (en) | 2013-07-24 |
| CN103222154B true CN103222154B (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180052956.0A Active CN103222154B (en) | 2011-03-10 | 2011-03-10 | Ferrite three-section type three-phase permanent-magnet motor |
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| Country | Link |
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| CN (1) | CN103222154B (en) |
| WO (1) | WO2012119317A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5936325A (en) * | 1996-12-31 | 1999-08-10 | Valeo Electronique | Synchronous type electrical machine |
| CN1853329A (en) * | 2003-09-16 | 2006-10-25 | 本田技研工业株式会社 | Stator of claw-pole shaped motor |
| CN201113738Y (en) * | 2007-09-29 | 2008-09-10 | 张振声 | Independent pole axial phase-splitting switched reluctance motor |
| CN101980433A (en) * | 2010-11-22 | 2011-02-23 | 沈阳工业大学 | Circumferentially phase-shifted and axially segmented wedge-shaped stator core external permanent magnet rotor synchronous motor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6744166B2 (en) * | 2001-01-04 | 2004-06-01 | Emerson Electric Co. | End cap assembly for a switched reluctance electric machine |
| TWI353705B (en) * | 2005-08-26 | 2011-12-01 | Hoeganaes Ab | An electric rotary machine |
| US7608963B2 (en) * | 2006-05-10 | 2009-10-27 | Robert M. Jones | Crimped rotor for an electric brushless direct current motor |
| CN202068244U (en) * | 2011-03-11 | 2011-12-07 | 浙江博望科技发展有限公司 | Ferrite three-segment three-phase permanent magnet motor |
-
2011
- 2011-03-10 WO PCT/CN2011/071690 patent/WO2012119317A1/en active Application Filing
- 2011-03-10 CN CN201180052956.0A patent/CN103222154B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5936325A (en) * | 1996-12-31 | 1999-08-10 | Valeo Electronique | Synchronous type electrical machine |
| CN1853329A (en) * | 2003-09-16 | 2006-10-25 | 本田技研工业株式会社 | Stator of claw-pole shaped motor |
| CN201113738Y (en) * | 2007-09-29 | 2008-09-10 | 张振声 | Independent pole axial phase-splitting switched reluctance motor |
| CN101980433A (en) * | 2010-11-22 | 2011-02-23 | 沈阳工业大学 | Circumferentially phase-shifted and axially segmented wedge-shaped stator core external permanent magnet rotor synchronous motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103222154A (en) | 2013-07-24 |
| WO2012119317A1 (en) | 2012-09-13 |
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