CN103762759B - There is the radial flux modularization polyphase machine of high Magnetic isolation ability - Google Patents
There is the radial flux modularization polyphase machine of high Magnetic isolation ability Download PDFInfo
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- CN103762759B CN103762759B CN201410042031.3A CN201410042031A CN103762759B CN 103762759 B CN103762759 B CN 103762759B CN 201410042031 A CN201410042031 A CN 201410042031A CN 103762759 B CN103762759 B CN 103762759B
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Abstract
Have the radial flux modularization polyphase machine of high Magnetic isolation ability, belong to machine field, when the present invention is the phase winding short circuit solving existing multiphase permanent magnet synchronous motor, faults-tolerant control difficulty is large; Due to winding space dispersion distribution, cause the problem being unfavorable for carrying out Fault Isolation and being designed to modular construction.The present invention includes modular stator, rotor, casing and main shaft, rotor is arranged on main shaft, and modular stator is arranged on the outside of rotor, and has air gap between modular stator and rotor; The outer round surface of modular stator is fixed on the internal circular surfaces of casing; Each modular stator comprises N number of identical stator modules, and described N number of identical stator modules is spliced into a disc; Each stator modules comprises stator core, five stator tooths and two concentrated coiling windings; Rotor: the 2N ± 2 piece permanent magnet that alternately contrary radial magnetizing is along the circumferential direction set at the outer round surface of rotor core.
Description
Technical field
The present invention relates to the radial flux modularization polyphase machine with high Magnetic isolation ability, belong to machine field.
Background technology
Multiphase permanent magnet synchronous motor, due to number of phases redundancy, has fault-tolerant operation ability, is applicable to the application scenario that how electric aircraft, pure electric vehicle, electric propulsion of warship etc. are higher to drive motors reliability requirement.Adopt the multiphase permanent magnet synchronous motor of distributed winding or vulgar fraction groove concentratred winding structure, all there is the shortcoming that alternate magnetic coupling is larger.When motor one phase winding is short-circuited fault, owing to there is magnetic coupling between winding, the magnetic flux that short circuit phase winding produces can remain in phase winding back-emf of inducting, and the control effects of impact residue phase winding, adds the difficulty of faults-tolerant control.On the other hand, great majority adopt the multiphase permanent magnet synchronous motor of distributed winding or vulgar fraction groove concentratred winding structure, and a certain phase winding spatially disperses distribution, is unfavorable for carrying out Fault Isolation and being designed to modular construction.
Summary of the invention
When the present invention seeks to the phase winding short circuit in order to solve existing multiphase permanent magnet synchronous motor, faults-tolerant control difficulty is large; Due to winding space dispersion distribution, cause the problem being unfavorable for carrying out Fault Isolation and being designed to modular construction, provide a kind of radial flux modularization polyphase machine with high Magnetic isolation ability.
The radial flux modularization polyphase machine with high Magnetic isolation ability of the present invention, it comprises modular stator, rotor, casing and main shaft,
Rotor is arranged on main shaft, and modular stator is arranged on the outside of rotor, and has air gap between modular stator and rotor, and described gas length is L;
The outer round surface of modular stator is fixed on the internal circular surfaces of casing;
Each modular stator comprises N number of identical stator modules, and described N number of identical stator modules is spliced into a disc; Each stator modules comprises stator core, five stator tooths and two concentrated coiling windings; Stator core is arranged five stator tooths; Described five stator tooths are followed successively by the first rectangular stator tooth, the second wide pole shoe stator tooth, the 3rd rectangular stator tooth, the 4th wide pole shoe stator tooth, the 5th rectangular stator tooth, and the first rectangular stator tooth, the 3rd rectangular stator tooth and the 5th rectangular stator tooth along the circumferential direction width are followed successively by: [(0.055 ± 0.01) π d/N] °, [(0.11 ± 0.02) π d/N] ° and [(0.055 ± 0.01) π d/N] °; The pole shoe place covering of the fan angle of the second wide pole shoe stator tooth and the 4th wide pole shoe stator tooth is [360 × (0.35 ± 0.01)/N] °; Wherein: d is the diameter of modular stator;
The concentrated coiling winding of each coiling one on the second wide pole shoe stator tooth and the 4th wide pole shoe stator tooth; The winding direction of two concentrated coiling windings is contrary;
Rotor comprises rotor core and 2N ± 2 piece permanent magnet, at the outer round surface of rotor core, 2N ± 2 piece permanent magnet is along the circumferential direction set, 2N ± 2 piece permanent magnet magnetizing direction is alternately contrary, and all permanent magnets all radially magnetize, and permanent magnet adopts Nd-Fe-Bo permanent magnet material to form;
Wherein: N be more than or equal to 3 natural number.
Advantage of the present invention: the present invention discloses a kind of radial flux modularization polyphase machine with high Magnetic isolation ability.Often adopt two adjacent concentrated coiling windings arrangements mutually, reach good Magnetic isolation effect, reduce the impact of fault relative surplus phase.In addition, stator adopts modularized design, facilitates large-scale processing manufacture, and can replace when a certain module breaks down, and reduces maintenance, repair cost.This motor is that a kind of reliability is high, power density large, manufactures the cheap polyphase machine body construction scheme of maintenance cost.
Accompanying drawing explanation
Fig. 1 is the structural representation with the radial flux modularization polyphase machine of high Magnetic isolation ability of the present invention;
Fig. 2 is the structural representation of stator modules;
Fig. 3 is the concentrated coiling developed winding diagram in a stator modules;
Fig. 4 is the distribution map of stator tooth in a stator modules;
Magnetic flux path figure when Fig. 5 is a stator modules winding energising;
Air gap flux density figure when Fig. 6 is the energising of all windings;
Fig. 7 is all windings energising time-harmonic wave distribution map.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 7, have the radial flux modularization polyphase machine of high Magnetic isolation ability described in present embodiment, it comprises modular stator 1, rotor 2, casing 3 and main shaft 11,
Rotor 2 is arranged on main shaft 11, and modular stator 1 is arranged on the outside of rotor 2, and has air gap between modular stator 1 and rotor 2, and described gas length is L;
The outer round surface of modular stator 1 is fixed on the internal circular surfaces of casing 3;
Each modular stator 1 comprises N number of identical stator modules, and described N number of identical stator modules is spliced into a disc; Each stator modules comprises stator core 4, five stator tooths 5 and two concentrated coiling windings 6; Stator core 4 is arranged five stator tooths 5; Described five stator tooths 5 are followed successively by the first rectangular stator tooth, the second wide pole shoe stator tooth, the 3rd rectangular stator tooth, the 4th wide pole shoe stator tooth, the 5th rectangular stator tooth, and the first rectangular stator tooth, the 3rd rectangular stator tooth and the 5th rectangular stator tooth along the circumferential direction width are followed successively by: [(0.055 ± 0.01) π d/N] °, [(0.11 ± 0.02) π d/N] ° and [(0.055 ± 0.01) π d/N] °; The pole shoe place covering of the fan angle of the second wide pole shoe stator tooth and the 4th wide pole shoe stator tooth is [360 × (0.35 ± 0.01)/N] °; Wherein: d is the diameter of modular stator 1;
The concentrated coiling winding 6 of each coiling one on the second wide pole shoe stator tooth and the 4th wide pole shoe stator tooth; The winding direction of two concentrated coiling windings 6 is contrary;
Rotor 2 comprises rotor core 7 and 2N ± 2 piece permanent magnet 8, at the outer round surface of rotor core 7,2N ± 2 piece permanent magnet 8 is along the circumferential direction set, 2N ± 2 piece permanent magnet 8 magnetizing direction is alternately contrary, and all permanent magnets 8 all radially magnetize, and permanent magnet 8 adopts Nd-Fe-Bo permanent magnet material to form;
Wherein: N be more than or equal to 3 natural number.
For solving the problem related in background technology, present embodiment adopts the radial flux modularization polyphase machine (as shown in accompanying drawing 1,2) with high Magnetic isolation ability, modular stator 1 is often made up of a stator modules, and stator modules comprises the spatially adjacent concentrated coiling winding 6 of five stator tooths 5, two.The space path that the magnetic flux that this stator structure can make a phase winding produce is consisted of five stator tooths 5, air gap, rotor core 7, rotor permanent magnet 8 closes, and not other phase winding of hinge, thus reach good Magnetic isolation effect, under farthest avoiding short trouble, the impact of fault relative surplus phase winding.Meanwhile, owing to have employed modularized design, greatly can promote the convenient degree of processing and manufacturing, and conveniently replace when a certain module breaks down.
Operation principle: as shown in Figure 5, when a certain phase winding energising of modular stator 1, form closed-loop path by the magnetic line of force of air gap by the permanent magnet 8 of the stator tooth of five in stator modules 5, stator core 4, air gap, rotor 2, rotor core 7, and do not form closed-loop path via other stator modules.In theory, there is not magnetic coupling between disparate modules.
In like manner, when a certain phase winding of motor is short-circuited fault, the magnetic line of force that short-circuited winding produces also is closed by above-mentioned path, does not form closed-loop path via other stator modules, thus eliminates the impact on residue phase winding, achieves good Magnetic isolation effect.
Meanwhile, the heating in winding brought due to short circuit current also can be efficiently controlled in stator modules, can not be diffused into other stator modules at once, is conducive to protecting all the other stator modules.
During normal work, the winding in N number of module passes to following sinusoidal current successively:
Wherein: i
a, i
b, i
c, i
d, i
eand i
fbe respectively the electric current of winding in the 1st, 2,3,4,5 and 6 stator modules;
ω is motor angular velocity of rotation;
I
mfor current effective value.
Through two-dimensional FE analysis, air gap flux density distribution map when above-mentioned motor winding is energized and harmonic analysis can be obtained, as shown in Figure 6 and Figure 7.This motor can utilize 5 times or 7 mmf harmonics work, can increase winding span, improve the winding coefficient of motor, therefore the work harmonic wave of the best is 7 times owing to adopting during 7 mmf harmonics.Corresponding, rotor permanent magnet should adopt 14 electrode structures.
For N-phase electric machine (N=3,4,5 ...), rotor permanent magnet number of poles can be (2N ± 2), and should get (2N+2) for optimum.
When motor generation winding open circuit or short trouble, the current excitation amplitude of adjustable residue module and phase place, reconstitute circular rotating magnetic potential, thus realize stable faults-tolerant control.
For N-phase electric machine (N=3,4,5 ...), supporting controller can be N phase half-bridge structure, N phase full bridge structure.
Stator modules adds man-hour, and soft-magnetic composite material one-shot forming can be adopted to form.This execution mode operation is simple, can promote the speed of processing and manufacturing, be conducive to large-scale production.Or, be processed into silicon steel sheet as shown in Figure 3, be more radially overrided to form.
Embodiment two: present embodiment is described below in conjunction with Fig. 2 and Fig. 4, present embodiment is described further execution mode one, the side, yoke portion of the stator core 4 of each stator modules arranges semi-cylindrical hill part 9, be symmetrical arranged semi-circular recesses 10 at the opposite side in yoke portion, adjacent two stator modules are cooperatively interacted by semi-cylindrical hill part 9 and semi-circular recesses 10 and are stitched together.
Semi-cylindrical hill part 9 and semi-circular recesses 10 adopt matched in clearance, after along the circumferential direction being spliced by N number of stator modules, utilize hot jacket technology, are nested in casing 3.
Embodiment three: present embodiment is described further execution mode one, permanent magnet 8 adopts surface-mount type, Halbach array formula or built-in structure.
Embodiment four: present embodiment is described further execution mode one, stator core 4 and rotor core 7 all adopt soft-magnetic composite material to cast or silicon steel sheet laminates formation vertically.
Present embodiment this setup, reduces the eddy current loss of electric machine iron core.
Embodiment five: present embodiment is described below in conjunction with Fig. 1 to Fig. 7, provides a specific embodiment, N=6 in the present embodiment.
Each modular stator (see accompanying drawing 2) six stator modules, each stator modules comprises stator core 4, five stator tooths 2 and two concentrated coiling windings 6, three straight-tooth that are middle and two ends are narrower, place width is followed successively by [(0.055 ± 0.01) π d/6] °, [(0.11 ± 0.02) π d/6] °, [(0.055 ± 0.01) π d/6] °, and wherein d is the diameter of modular stator 1.The pole shoe of two other stator tooth is wider, and place covering of the fan angle is (21 ± 0.6) °, and distinguishes the concentrated coiling winding 6 of coiling two on these two wide pole shoe stator tooths.
Rotor 2(is shown in accompanying drawing 1) outer round surface 10 pieces or the 14 pieces alternately contrary permanent magnets 8 that magnetize are set, permanent magnet 8 adopts Nd-Fe-Bo permanent magnet material form and radially magnetize.
During normal work, the winding in six stator modules passes to following sinusoidal current successively:
Through two-dimensional FE analysis, air gap flux density distribution map when above-mentioned motor winding is energized and harmonic analysis can be obtained, as shown in Figure 6.This motor can utilize 5 times or 7 mmf harmonics work, can increase winding span, improve the winding coefficient of motor, therefore the work harmonic wave of the best is 7 times owing to adopting during 7 mmf harmonics.Corresponding, rotor permanent magnet should adopt 14 electrode structures.
Relative to typical 24 groove 22 pole fractional-slot concentratred winding six phase permanent-magnet synchronous motors, the above-mentioned radial flux modularization six-phase motor with high Magnetic isolation ability restrained effectively winding synthesis magnetomotive force 1 subharmonic, is conducive to the eddy current loss reducing motor.
The controller matched with motor can be six phase half-bridge structures, six phase full bridge structures, six phase eight bridge arm structures, six phase nine bridge arm structures.
Claims (4)
1. have the radial flux modularization polyphase machine of high Magnetic isolation ability, it comprises modular stator (1), rotor (2), casing (3) and main shaft (11),
Rotor (2) is arranged on main shaft (11), modular stator (1) is arranged on the outside of rotor (2), and having air gap between modular stator (1) and rotor (2), described gas length is L;
The outer round surface of modular stator (1) is fixed on the internal circular surfaces of casing (3);
It is characterized in that, each modular stator (1) comprises N number of identical stator modules, and described N number of identical stator modules is spliced into a disc; Each stator modules comprises stator core (4), five stator tooths (5) and two concentrated coiling windings (6); Stator core (4) is arranged five stator tooths (5); Described five stator tooths (5) are followed successively by the first rectangular stator tooth, the second wide pole shoe stator tooth, the 3rd rectangular stator tooth, the 4th wide pole shoe stator tooth, the 5th rectangular stator tooth, and the first rectangular stator tooth, the 3rd rectangular stator tooth and the 5th rectangular stator tooth along the circumferential direction width are followed successively by: [(0.055 ± 0.01) π d/N] °, [(0.11 ± 0.02) π d/N] ° and [(0.055 ± 0.01) π d/N] °; The pole shoe place covering of the fan angle of the second wide pole shoe stator tooth and the 4th wide pole shoe stator tooth is [360 × (0.35 ± 0.01)/N] °; Wherein: d is the diameter of modular stator (1);
The concentrated coiling winding (6) of each coiling one on the second wide pole shoe stator tooth and the 4th wide pole shoe stator tooth; The winding direction of two concentrated coiling windings (6) is contrary;
Rotor (2) comprises rotor core (7) and 2N ± 2 piece permanent magnet (8), at the outer round surface of rotor core (7), 2N ± 2 piece permanent magnet (8) are along the circumferential direction set, 2N ± 2 piece permanent magnet (8) magnetizing direction is alternately contrary, all permanent magnets (8) all radially magnetize, and permanent magnet (8) adopts Nd-Fe-Bo permanent magnet material to form;
Wherein: N be more than or equal to 3 natural number.
2. there is the radial flux modularization polyphase machine of high Magnetic isolation ability according to claim 1, it is characterized in that, the side, yoke portion of the stator core (4) of each stator modules arranges semi-cylindrical hill part (9), be symmetrical arranged semi-circular recesses (10) at the opposite side in yoke portion, adjacent two stator modules are cooperatively interacted by semi-cylindrical hill part (9) and semi-circular recesses (10) and are stitched together.
3. have the radial flux modularization polyphase machine of high Magnetic isolation ability according to claim 1, it is characterized in that, permanent magnet (8) adopts surface-mount type, Halbach array formula or built-in structure.
4. have the axial magnetic flux modularization polyphase machine of high Magnetic isolation ability according to claim 1, it is characterized in that, stator core (4) and rotor core (7) all adopt soft-magnetic composite material to cast or silicon steel sheet laminates formation vertically.
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| CN110829643B (en) * | 2018-08-10 | 2021-09-21 | 广东威灵电机制造有限公司 | Radial flux electric machine |
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