CN105337434B - Hybrid excitation permanent magnetic brushless used for electric vehicle - Google Patents

Hybrid excitation permanent magnetic brushless used for electric vehicle Download PDF

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CN105337434B
CN105337434B CN201510751940.9A CN201510751940A CN105337434B CN 105337434 B CN105337434 B CN 105337434B CN 201510751940 A CN201510751940 A CN 201510751940A CN 105337434 B CN105337434 B CN 105337434B
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permanent magnetic
magnet steel
permanent
magnet
steel
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CN105337434A (en
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全力
顾玮玮
朱孝勇
杜怿
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Jiangsu University
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Jiangsu University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

Abstract

The present invention discloses a kind of hybrid excitation permanent magnetic brushless used for electric vehicle, internal rotor is embedded with inside and outside two layers of permanent magnetic steel evenly distributed in the circumferential direction, outer layer is the Nd-Fe-B permanent magnetic magnet steel of V-type, internal layer is the ferrite permanent-magnet magnet steel of spoke-like, two kinds of permanent magnetic steels positioned at it is same extremely on, Nd-Fe-B permanent magnetic magnet steel and ferrite permanent-magnet magnet steel are on the extremely substantially symmetrical about its central axis of place pole;The V-type opening of Nd-Fe-B permanent magnetic magnet steel is towards ferrite permanent-magnet magnet steel, each Nd-Fe-B permanent magnetic magnet steel is made up of identical the first Nd-Fe-B permanent magnetic magnet steel and the second Nd-Fe-B permanent magnetic magnet steel on the distribution extremely substantially symmetrical about its central axis of place pole, and the V-type open top of the Nd-Fe-B permanent magnetic magnet steel is directly fixedly linked with the outer end of ferrite permanent-magnet magnet steel;By the way of thulium permanent magnet and ferrite combination excitation, the parallel connection of two kinds of permanent magnetic steel main magnetic circuits is realized, further increases the torque density and power density of motor.

Description

Hybrid excitation permanent magnetic brushless used for electric vehicle
Technical field
The invention belongs to technical field of motor manufacture, refer in particular to one kind and be suitable for the application scenarios such as electric automobile to need high torque (HT) Density, high power density, the permanent magnetic brushless of high efficiency driveability requirement.
Background technology
High-performance permanent magnet brushless motor is by small size, high torque density, high power density, high efficiency, good dynamic The advantages that response, has been successfully applied in the drive system of automobile.But due to the rare earth permanent-magnetic material in permanent magnetic brushless Price is constantly soaring, and supply chain is more and more unstable, and the development of permanent magnetic brushless is by serious obstruction.In order to not influence The manufacturing cost of motor is reduced in the case of the torque output of motor turns into study hotspot instantly, occur non-terres rares motor and Hybrid excitation class motor.
1) non-terres rares motor.Have that cheap, manufacturing process is simple, coercivity is big, anti-degaussing in view of ferrite The advantages that ability is stronger, current widely used Ferrite Material substitution rare earth permanent-magnetic material, and because Ferrite Material remanent magnetism is close Degree is not high, and maximum magnetic energy product is smaller, and the general rotor structure using spoke-like is to increase permanent-magnet torque, so as to reduce as much as possible Gap between non-terres rares motor and terres rares motor performance.Patent Chinese Patent Application No. is 201120445225.X text A kind of trapezoidal ferrite excitation magneto of groove of 8 pole 9 is proposed in offering, this embedded magnetism-collected structure of multipole drastically increases The air gap flux density of motor, so as to meet the requirement of high power and high torque (HT).And burst rotor structure is even more to effectively eliminate magnetic Bridge leakage field, the output torque of motor is further increased, realize that ferrite motor reaches or close to surface-mount type rare-earth permanent-magnet electric machine Identical torque output capability.However, because ferritic dosage and volume are larger, it will inevitably increase the body of motor Product, so that the torque of this kind of non-terres rares motor and power density have reduced;Ferrite Material is easily gone by irreversible Magnetic, the end of magnet need to use extra non-magnet material to be protected so that the motor inevitably leads to structure Complicate, and the increase of manufacture difficulty of processing and cost;Moreover, burst rotor structure limits motor to a certain extent Run at high speed, also improve the difficulty of assembling.Chinese Patent Application No. is to propose one kind in 201310149285.0 document Magneticflux-switching type built-in type permanent-magnet memory electrical machine, by by the non-rare earth Al-Ni-Co permanent magnet magnet steel with online adjustable magnetic characteristic and directly Stream magnetization winding is combined, and effectively increases the output torque and power output of motor.Because alnico magnet magnetizes only online Magnetizing current in short-term or pulsed magnetizing current are only needed, magnetizing current action time is very short (being only Millisecond), greatly reduces Electrical excitation copper loss needed for flux control, so as to effectively increasing operational efficiency of the motor in weak magnetic area.But such motor by In adding flux control winding, it is necessary to which such winding is placed in extra inner space, this make it that the volume of such motor is larger, Torque and power density decrease.In addition, to be also required to extra magnetization winding inverse for such motor-field on-line control and control Become device, electric machine control system cost and complexity are consequently increased.
2) hybrid excitation class motor.The mixed excitation electric machine of electrical excitation winding is integrated with, by adjusting electricity excitation magnetic field Size and Orientation adjusts air-gap field, it is achieved thereby that wider speed adjustable range and high power, efficient output performance.China Number of patent application be 201510095867.4 document in propose a kind of mixed excitation electric machine, the motor using less magnet steel, The mode of the common excitation of Exciting Windings for Transverse Differential Protection replaces a certain pole of script magneto, so as to by adjust exciting current realize it is larger Speed adjustable range, less rare earth usage amount and cost reduction.Chinese Patent Application No. is 201410257708.5 text A kind of middle rotor with salient pole formula mixed excitation electric machine of the proposition based on magnetic gear is offered, motor-field is by being affixed on the permanent-magnet magnetic of stator surface Steel and the Exciting Windings for Transverse Differential Protection being wound on stator tooth produce, and on the one hand improve the reliability of motor, on the other hand also improve biography The system nonadjustable defect of Magnetic Field for Permanent Magnet Electrical Machines, has the advantages of low speed increases magnetic, high speed weak magnetic.But the structure of the first shunt excitation formula In, due to the presence of axial magnetic circuit, stator and rotor back yoke needs to increase the preferable electrical pure iron of magnetic property, and structure is complex, Manufacture, also relative difficulty is installed;And in the structure of second of series excitation formula, the magnetic circuit of electrical excitation passes through permanent magnetic steel, magnetic circuit reluctance It is larger, make exciting current larger, copper loss increase, meanwhile, electrical excitation magnetomotive force directly acts on permanent magnetic steel, and adding it can not The risk of inverse demagnetization, also reduce the reliability of motor.
Therefore, while rare earth permanent-magnetic material dosage is reduced, rational in infrastructure, high torque density, high power how to be obtained The permanent magnetic brushless of density turns into urgent problem to be solved in current permanent magnetic brushless field.
The content of the invention
The purpose of the present invention is to solve the problems such as rare earth permanent-magnetic material cost is high, supply is unstable, there is provided a kind of structure Simply, reliability is high, has high torque (HT), the hybrid excitation permanent magnetic brushless used for electric vehicle of high power density.
To achieve the above object, the technical solution adopted by the present invention is:The present invention includes stator, rotor and rotating shaft, rotor Stator interior is coaxially located at, the center of rotor is used to lay rotating shaft, and stator is made up of stator tooth, stator slot and stator yoke, adjacent Stator slot is formed between two stator tooths, armature is around being arranged in stator slot, and internal rotor is embedded with evenly distributed in the circumferential direction Inside and outside two layers of permanent magnetic steel, outer layer is the Nd-Fe-B permanent magnetic magnet steel of V-type, and internal layer is the ferrite permanent-magnet magnet steel of spoke-like, two Kind of permanent magnetic steel positioned at it is same extremely on, the pole central shaft pair of Nd-Fe-B permanent magnetic magnet steel and ferrite permanent-magnet magnet steel on place pole Claim;The V-type opening of Nd-Fe-B permanent magnetic magnet steel is towards ferrite permanent-magnet magnet steel, and each Nd-Fe-B permanent magnetic magnet steel is by the neodymium of identical first The distribution composition extremely substantially symmetrical about its central axis of iron boron permanent magnetic steel and the second Nd-Fe-B permanent magnetic magnet steel on place pole, the neodymium iron boron is forever The V-type open top of magnetic magnet steel is directly fixedly linked with the outer end of ferrite permanent-magnet magnet steel;Nd-Fe-B permanent magnetic in two neighboring pole Magnet steel tangentially alternately magnetizes, and the ferrite permanent-magnet magnet steel in two neighboring pole also tangentially alternately magnetizes, the Nd-Fe-B permanent magnetic on homopolarity Magnet steel is consistent with the magnetizing direction of ferrite permanent-magnet magnet steel.
Further, triangular notch is uniform-distribution with rotor outer circle, triangular notch number is equal to the number of poles of motor, Triangular notch is centrally located on the axis between two neighboring pole;
The outer edge of Nd-Fe-B permanent magnetic magnet steel 3 is provided with semicircle magnetic barrier;
There is radial width between the Nd-Fe-B permanent magnetic magnet steel outward flange and rotor outward flange;
Armature winding arranges into modularization fractional-slot centralization, is concentrated in together per phase winding, and each winding technique is in fixed On sub- tooth, double-decker is formed in stator slot.
The present invention has an advantageous effect in that after using above-mentioned technical proposal:
1st, the present invention is by the way of thulium permanent magnet and ferrite combination excitation, and wherein thulium permanent magnet uses V Type magnetism-collected structure is to improve air gap flux density peak value, and ferrite uses spoke-like structure to improve permanent-magnet torque, both permanent-magnet magnetics Steel is using alternately cutting orientation magnetizing mode, it is achieved thereby that the parallel connection of two kinds of permanent magnetic steel main magnetic circuits, it is few to further increase this The torque density and power density of rare earth permanent magnet brushless motor, on the basis of reducing thulium permanent magnet dosage and reducing cost Enable to compare favourably with the torque output capability of rare earth permanent magnet brushless motor.
2nd, the structure that the present invention is joined directly together using thulium permanent magnet with ferrite end, it is achieved thereby that two kinds of permanent magnetism The series connection on magnet steel brow leakage road, can so omit thulium permanent magnet inner boundary every magnetic measure, and outside ferrite The anti-degaussing measure of boundary's nonmagnetic substance, reduce the difficulty of motor processing and manufacturing;Leakage field is additionally, since to be fully used, Effective permanent magnet flux linkage increase, torque output capability are lifted caused by hybrid excitation magnet steel;Further, since thulium permanent magnet It is not easy by weak magnetic, the operating point of ferrite external boundary is higher in series circuit, can largely reduce by irreversible degaussing Risk, improve the reliability of motor of the present invention.
3rd, the present invention uses rotor structure of the thulium permanent magnet outside, including ferrite, so as to increase as much as possible Add ferritic dosage, improve the torque output capability of motor, also take full advantage of the inner space of motor, improve in tradition Formula permagnetic synchronous motor is put in order to reduce leakage field and wasting space is in rotating shaft the drawbacks of.
4th, the present invention uses non-magnetic salient pole type pivot structure, can efficiently reduce the leakage field of ferrite inner boundary.
5th, the present invention has effectively filtered part low-order harmonic, dropped by using the measure slotted on outer circle of motor rotor The low cogging torque of motor.
6th, modularization fractional-slot centralization winding is used on stator of the invention, is advantageous to further increase d-axis inductance, Increase motor weak magnetic and wide range speed control service ability.Alternate mutual inductance, increase fault-tolerant ability and raising motor can be also reduced simultaneously Reliability.
Brief description of the drawings
Fig. 1 is the radial section structural representation of present invention hybrid excitation permanent magnetic brushless used for electric vehicle;
Fig. 2 is the close-up schematic view of stator in Fig. 1;
Fig. 3 is that stator armature winding is modularization centralized formula connected mode schematic diagram in Fig. 1;
Fig. 4 is the partial structurtes of rotor and physical dimension mark enlarged diagram in Fig. 1;
Fig. 5 is that the structure of magnet steel 3 and physical dimension mark enlarged diagram in rotor in Fig. 1;
Fig. 6 is that the structure of magnet steel 4 and physical dimension mark enlarged diagram in rotor in Fig. 1;
Fig. 7 is that magnet steel magnetizes schematic diagram in rotor of the present invention;
Fig. 8 is the magnetic flux schematic diagram of magnet steel in rotor of the present invention;
Fig. 9 is no-load magnetic field distribution map of the present invention;
Figure 10 is the present invention and the torque-speed performance comparison figure of conventional internal formula permagnetic synchronous motor;
Figure 11 is the present invention and power-rate performance comparison diagram of conventional internal formula permagnetic synchronous motor.
In figure:1. stator;2. rotor;3. Nd-Fe-B permanent magnetic magnet steel;4. ferrite permanent-magnet magnet steel;5. magnetic hinders;6. triangle Notch;7. stator yoke;8. stator slot;9. stator tooth;10. rotating shaft;11、12、13、14、15、16、17、18、19、20、21、22. Armature winding;31. the first Nd-Fe-B permanent magnetic magnet steel;32. the second Nd-Fe-B permanent magnetic magnet steel.
Embodiment
Referring to Fig. 1, the present invention is a kind of few rare earth hybrid excitation wide range speed control permanent magnetic brushless, using outer stator structure, Including stator 1, rotor 2 and rotating shaft 10.Rotor 2 is coaxially located inside stator 1, and the center of rotor 2 is used to lay rotating shaft 10.Stator There is air gap between 1 inwall and the outer wall of rotor 2, the thickness of air gap and the power grade of motor, selected permanent-magnet material and Stator 1, rotor 2 are processed relevant with assembly technology.Stator 1 and rotor 2 are formed by the silicon steel plate stacking of 0.35mm thickness, are folded It is 0.95 to press coefficient.
The inside of rotor 2 is embedded with inside and outside two layers of permanent magnetic steel, and inside and outside two layers of permanent magnetic steel is evenly distributed in the circumferential direction, outside Layer is the Nd-Fe-B permanent magnetic magnet steel 3 of V-type, and internal layer is the ferrite permanent-magnet magnet steel 4 of irregular spoke-like, and two kinds of permanent magnetic steels are located at It is same extremely on, Nd-Fe-B permanent magnetic magnet steel 3 and ferrite permanent-magnet magnet steel 4 are on the extremely substantially symmetrical about its central axis of place pole, and neodymium iron boron is forever When magnetic magnet steel 3 is embedded in, certain radial width is left between the outward flange of Nd-Fe-B permanent magnetic magnet steel 3 and the outward flange of rotor 2.Rotor 2 Triangular notch 6 is uniform-distribution with cylindrical, number is equal to the number of poles of motor, and triangular notch 6 is centrally located at adjacent two On the axis of pole.
Referring to Fig. 2, stator 1 is made up of stator tooth 9, stator slot 8, stator yoke 7.It is fixed to be formed between two neighboring stator tooth 9 Pilot trench 8, armature is around being arranged in stator slot 8.The radial cross-section of stator tooth 9 be approximately T-shaped, T-shaped top close to rotor 2, it is T-shaped Bottom be connected as a single entity with stator yoke 7.Facewidth note t at the radial center of stator tooth 99, the radial width of stator yoke 7 is y7, it is Prevent the magnetic circuit saturation of stator yoke 7 and make full use of magnetic circuit space, it is desirable to t9≈2y7.Lay in the stator slot 8 armature around Group.
Referring to Fig. 2 and Fig. 3, wherein "+" is the inlet wire direction of armature winding, and "-" is the outlet direction of armature winding, A, B, C is motor three-phase windings.The motor of the present invention contains 12 grooves, armature winding 11,12,13,14,15,16,17,18,19,20, 21st, 22 one-tenth following modularization fractional-slot centralization arrangements:A+A-B+B-B-B++C-C+C+C-A+A-A-A+B-B+B+B-C+C-C- C+A-A+.Wherein concentrated in together per phase winding, and each winding technique forms double-deck knot on stator tooth 9 in stator slot 8 Structure.
Referring to Fig. 4, the Nd-Fe-B permanent magnetic magnet steel 3 of the V-type for the outer layer inlayed on rotor 2 is close to air gap, the spoke-like of internal layer Ferrite permanent-magnet magnet steel 4 close to rotating shaft 10.The V-type opening of Nd-Fe-B permanent magnetic magnet steel 3 is towards ferrite permanent-magnet magnet steel 4, neodymium iron The external boundary of boron permanent magnetic steel 3 is V-type bottom, and the outer edge of Nd-Fe-B permanent magnetic magnet steel 3 is provided with semicircle magnetic barrier (or air gap) 5, to reduce the leakage field of the external boundary of Nd-Fe-B permanent magnetic magnet steel 3.Rotating shaft 10 uses salient-pole structure, so as to reduce ferrite permanent-magnet magnetic The leakage field of the inner boundary of steel 4;The inner of Nd-Fe-B permanent magnetic magnet steel 3 is V-type open top, straight with the outer end of ferrite permanent-magnet magnet steel 4 Connect and be fixedly linked.Two kinds of permanent magnetic steels are uniformly distributed around spindle central point o.Wherein, the external diameter of rotor 2 is R2o, rotor 2 it is interior Footpath is R2i, in order to match and ensure to make full use of the inner space of motor with standard rotating shaft, it is necessary to meet 15mm≤R2i≤ 0.25R2o.The top of triangular notch 6 and center of circle o distance are R6, triangle angle of release is 2 θ6, it is contemplated that the reasonability of motor, Meet 0.9R2o≤R6< R2oWith 0 ° of < θ6In the case of the θ of < 0.25 (θ is rotor pole arc), by motor performance optimum option most The figure of merit.
Referring to Fig. 5, the Nd-Fe-B permanent magnetic magnet steel 3 of each V-type by the first Nd-Fe-B permanent magnetic magnet steel 31 and the second neodymium iron boron forever Extremely substantially symmetrical about its central axis distribution composition of the magnetic magnet steel 32 on place pole, the first Nd-Fe-B permanent magnetic magnet steel 31 and the second Nd-Fe-B permanent magnetic The structure of the two the Nd-Fe-B permanent magnetic magnet steel of magnet steel 32 is identical, the first Nd-Fe-B permanent magnetic magnet steel 31 and the second Nd-Fe-B permanent magnetic magnet steel Angle between 32 is θ3, the width of the first Nd-Fe-B permanent magnetic magnet steel 31 and the second Nd-Fe-B permanent magnetic magnet steel 32 is all w3, thickness is all For h3, in order to ensure the reasonability of electric machine structure, and the torque output capability and increase d-axis inductance of motor are improved, need to meet 25 °≤θ of condition3≤ 30 °, 0 < w3< 0.25R2o, w3×h3=30.8mm2(dosage of two Nd-Fe-B permanent magnetic magnet steel is fixed Value);Beeline between two Nd-Fe-B permanent magnetic magnet steel and the pole axis of pole where it is x3, in order to ensure silicon steel sheet Mechanical strength and as far as possible reduction leakage field, need to meet condition 1mm≤x3≤2mm;Nd-Fe-B permanent magnetic magnet steel 31 is apart from machine shaft 10 center of circle o longest distance is y3, it is contemplated that rotor external boundary and magnetic hinder the mechanical strength of silicon steel sheet between 5 and subtracted as far as possible Few leakage field, need to meet condition 0.8R2o< y3< R2o-0.5h3-2mm。
Referring to Fig. 6, the beeline between ferrite permanent-magnet magnet steel 4 and center of circle o is x4, in order to be stayed to salient pole rotating shaft 10 While there are enough spaces, the dosage of ferrite permanent-magnet magnet steel 4 is improved to improve the torque output capability of motor, need to meet bar Part R2i< x4< 1.5R2i;Beeline between on ferrite permanent-magnet magnet steel 4 to the axis of two neighboring pole is y4, in order to protect Demonstrate,prove the mechanical strength of silicon steel sheet between adjacent two blocks of ferrite permanent-magnet magnet steel 4 and reduce leakage field, condition 1mm≤y need to be met4≤ 2mm;The inner length diametrically of ferrite permanent-magnet magnet steel 4 is h4, turn to make full use of the inner space of motor to improve Square fan-out capability, and ensure the mach reasonability of electricity and the mechanical strength of silicon steel sheet, condition 0mm < h need to be met4< 0.5 (R2o-x4)。
Referring to Fig. 7, Nd-Fe-B permanent magnetic magnet steel 3 in two neighboring pole is using the mode that alternately magnetizes, the iron oxygen in two neighboring pole Using the mode that alternately magnetizes, cutting orientation magnetizing direction, and the neodymium iron on homopolarity also are used per the extremely upper permanent-magnet magnetic steel capital for body permanent magnetic steel 4 Boron permanent magnetic steel 3 is consistent with the magnetizing direction of ferrite permanent-magnet magnet steel 4.
Referring to Fig. 8 and Fig. 9, the main magnetic circuit of Nd-Fe-B permanent magnetic magnet steel 3 is p3, p3Via the first Nd-Fe-B permanent magnetic magnet steel 31, turn Sub 2, second Nd-Fe-B permanent magnetic magnet steel 32, rotor 2, air gap, the second stator tooth 92, stator yoke 7, the first stator tooth 91, air gap, turn Sub 2, first Nd-Fe-B permanent magnetic magnet steel 31 forms closed-loop path;The main magnetic circuit of ferrite permanent-magnet magnet steel 4 is p4, p4Via ferrite Permanent magnetic steel 4, rotor 2, air gap, the second stator tooth 92, stator yoke 7, the first stator tooth 91, air gap, rotor 2, ferrite permanent-magnet Magnet steel 4 forms closed-loop path, and the main magnetic circuit p of two kinds of excitation materials3With main magnetic circuit p4Form parallel-connection structure, this kind of magnetic field superposition Mode be advantageous to improve motor torque density and power density.Leakage magnetic circuit p34With the main magnetic circuit p of Nd-Fe-B permanent magnetic magnet steel 33 With the main magnetic circuit p of ferrite permanent-magnet magnet steel 44Parallel connection, via the first Nd-Fe-B permanent magnetic magnet steel 31, ferrite permanent-magnet magnet steel 4, second Nd-Fe-B permanent magnetic magnet steel 32, rotor 2, air gap, the second stator tooth 92, stator yoke 7, the first stator tooth 91, air gap, rotor 2, first Nd-Fe-B permanent magnetic magnet steel 31 forms closed-loop path, realizes the series connection of two kinds of excitation material leakage magnetic circuits, this kind of structure can utilize The leakage field of permanent magnetic steel script, it is allowed to as effective magnetic field to improve the fan-out capability of the torque of motor of the present invention;Moreover, neodymium iron The inner boundary of boron permanent magnetic steel 3 and the external boundary of ferrite permanent-magnet magnet steel 4 can omit every magnetic measure, so as to reduce motor processing The difficulty of manufacture;In addition, the magnetic field intensity of the operating point of Nd-Fe-B permanent magnetic magnet steel 3 is higher, then leakage magnetic circuit p34On magnetic field it is strong Degree is also higher, so as to protect the external boundary of ferrite permanent-magnet magnet steel 4, is allowed to be not easy by irreversible degaussing.
Referring to Figure 10 and Figure 11, model I is traditional built-in type permanent-magnet brushless electric machine, and model II is proposed by the invention Few rare earth hybrid excitation wide range speed control permanent magnetic brushless, the dosage of Nd-Fe-B permanent magnetic magnet steel is dosage in model I in model II Half.Two motor models use identical control method, i.e., base speed is following uses maximum torque per ampere control, base speed with It is upper to be controlled using weak magnetic, by finite element simulation, related torque and the power characteristic of two motors are obtained, respectively such as Figure 10 Shown in Figure 11.As shown in Figure 10, motor of the present invention is on the premise of half Nd-Fe-B permanent magnetic magnet steel is reduced, by using it is low into The structure of this two kinds of excitation materials of ferrite permanent-magnet magnet steel and reasonable arrangement, make its torque output capability with it is traditional built-in Formula permagnetic synchronous motor compares favourably.As shown in Figure 11, compared with traditional internal permanent magnet synchronous motor, motor displaying of the present invention Go out broader output-constant operation speed adjustable range, wide prospect is opened for being applied in combination for magnetic material.

Claims (7)

1. a kind of hybrid excitation permanent magnetic brushless used for electric vehicle, including stator (1), rotor (2) and rotating shaft (10), rotor (2) stator (1) inside is coaxially located at, the center of rotor (2) is used to lay rotating shaft (10), and stator (1) is by stator tooth (9), stator Groove (8) and stator yoke (7) composition, form stator slot (8) between two neighboring stator tooth (9), and armature is around being arranged in stator slot (8) In, inside and outside two layers of permanent magnetic steel evenly distributed in the circumferential direction is embedded with inside rotor (2), outer layer is the Nd-Fe-B permanent magnetic of V-type Magnet steel (3), internal layer are the ferrite permanent-magnet magnet steel (4) of spoke-like, two kinds of permanent magnetic steels positioned at it is same extremely on, Nd-Fe-B permanent magnetic magnetic Steel (3) and ferrite permanent-magnet magnet steel (4) are on the extremely substantially symmetrical about its central axis of place pole;The V-type opening of Nd-Fe-B permanent magnetic magnet steel (3) Towards ferrite permanent-magnet magnet steel (4), each Nd-Fe-B permanent magnetic magnet steel (3) is by identical the first Nd-Fe-B permanent magnetic magnet steel (31) and Extremely substantially symmetrical about its central axis distribution composition of the two Nd-Fe-B permanent magnetic magnet steel (32) on place pole, the V of the Nd-Fe-B permanent magnetic magnet steel (3) Type open top and the outer end of ferrite permanent-magnet magnet steel (4) are directly fixedly linked;Nd-Fe-B permanent magnetic magnet steel (3) in two neighboring pole Tangential alternately to magnetize, the ferrite permanent-magnet magnet steel (4) in two neighboring pole is also tangential alternately to magnetize, the Nd-Fe-B permanent magnetic magnetic on homopolarity Steel (3) is consistent with the magnetizing direction of ferrite permanent-magnet magnet steel (4), it is characterized in that:The external diameter of rotor (2) is R2o, internal diameter R2i, 15mm≤R need to be met2i≤0.25R2o;Between first Nd-Fe-B permanent magnetic magnet steel (31) and the second Nd-Fe-B permanent magnetic magnet steel (32) Angle is θ3, the width of the first Nd-Fe-B permanent magnetic magnet steel (31) and the second Nd-Fe-B permanent magnetic magnet steel (32) is all w3, thickness is all h3, 25 °≤θ need to be met3≤ 30 °, 0 < w3< 0.25R2o、w3×h3=30.8mm2;First Nd-Fe-B permanent magnetic magnet steel (31) and Beeline between two Nd-Fe-B permanent magnetic magnet steel (32) and the pole axis of pole where it is x3, 1mm≤x need to be met3≤2mm; First Nd-Fe-B permanent magnetic magnet steel (31) and the second Nd-Fe-B permanent magnetic magnet steel (32) are y apart from center of circle o longest distance3, need to meet 0.8R2o< y3< R2o-0.5h3-2mm;Beeline between ferrite permanent-magnet magnet steel (4) and center of circle o is x4, R need to be met2i< x4< 1.5R2i;Beeline between on ferrite permanent-magnet magnet steel (4) to the axis between two neighboring pole is y4, need to meet 1mm≤y4≤2mm。
2. hybrid excitation permanent magnetic brushless used for electric vehicle according to claim 1, it is characterized in that:On rotor (2) is cylindrical Triangular notch (6) is uniform-distribution with, triangular notch (6) number is equal to the number of poles of motor, the centre bit of triangular notch (6) On axis between two neighboring pole.
3. hybrid excitation permanent magnetic brushless used for electric vehicle according to claim 2, it is characterized in that:Triangular notch (6) Top and the distance between rotor center of circle o be R6, the angle of release of triangle is 2 θ 6, need to meet 0.9R2o≤R6< R2oWith 0 ° of < θ6 < 0.25 θ, θ are rotor pole arc, R2oFor the external diameter of rotor.
4. hybrid excitation permanent magnetic brushless used for electric vehicle according to claim 1, it is characterized in that:Nd-Fe-B permanent magnetic magnet steel (3) outer edge is provided with semicircle magnetic barrier (5).
5. hybrid excitation permanent magnetic brushless used for electric vehicle according to claim 1, it is characterized in that:The Nd-Fe-B permanent magnetic There is radial width between magnet steel (3) outward flange and rotor (2) outward flange.
6. hybrid excitation permanent magnetic brushless used for electric vehicle according to claim 1, it is characterized in that:Armature winding is into module Change fractional-slot centralization arrangement, concentrate in together per phase winding, each winding technique is on stator tooth (9), in stator slot (8) Form double-decker.
7. hybrid excitation permanent magnetic brushless used for electric vehicle according to claim 1, it is characterized in that:The footpath of stator tooth (9) It is t to the facewidth at center9, the radial width of stator yoke (7) is y7, t need to be met9≈2y7
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