CN105471209A - Switched reluctance motor - Google Patents

Abstract

The invention provides a switched reluctance motor comprising an external rotor; an internal rotor which is arranged in the internal part of the external rotor and coaxially rotates with the external rotor; and a stator which is arranged between the external rotor and the internal rotor, wherein the internal surface of the stator is provided with multiple stator internal teeth which are convex along the radial direction of the stator, and the external surface of the stator is provided with multiple stator external teeth which are convex along the radial direction of the stator. The two sides of the tooth top end of each stator internal tooth are convexly provided with stator internal pole shoes which are arranged along the circumferential direction of the internal rotor, the two sides of the tooth top end of each stator external tooth are convexly provided with stator external pole shoes which are arranged along the circumferential direction of the internal rotor. Windings are wound on the stator yoke parts of the stator. The stator comprises pole shoe structures so that winding safety can be enhanced under the premise that salient pole ratio of the motor is not reduced and performance of the motor is not reduced, and performance of the motor can also be enhanced. Therefore, the switched reluctance motor is simple in structure and great in performance and efficiency.

Description

Switched reluctance machines

Technical field

The present invention relates to a kind of switched reluctance machines.

Background technology

Existing a kind of birotor switched reluctance machines, its stator has rightabout two salient poles in radial direction, and is wound with concentratred winding on salient pole, and surfaces externally and internally is being just homophase to the winding of pole, and internal rotor and external rotor are placed in stator inner side and outer side respectively.

Another kind of birotor switched reluctance machines, it comprises internal rotor, stator and external rotor, separated by air gap each other, its stator has rightabout two salient poles in radial direction, and concentratred winding is wound with on salient pole, stator yoke has the magnetism-isolating loop of circumferencial direction, and inside and outside winding is separate.

Above-mentioned two kinds of birotor switched reluctance machines, the width of rebate that its Adjacent salient poles is formed is very large, and groove inner wire very easily skids off, and is absolutely unsafe; Winding adopts concentrates volume structure, and in winding process, must reserve the space of winding mechanism, cause copper factor low, motor performance is low; Under this magnetic structure, magnetic circuit is long, and magnetic circuit closed path, by whole stator yoke and rotor yoke, causes magnetic potential shared by air gap to decline, and causes iron loss to increase; In the middle of stator, the existence of magnetism-isolating loop makes salient pole inside and outside stator be separated completely, refills after being made into entirety, and its manufacturability is complicated, assembling difficulty.

Also have a kind of single rotor switched reluctance machines, its rotor is split-type structural, and segmental rotor tooth block is embedded in not in magnetic conduction rotor metallic sheath, and stator is that U-shaped stator block consists of magnetic isolation plate, adopts distributed winding; Notch contains permanent magnet; Its winding is distribution volume structure, and end is comparatively large, and it not only produces copper loss, reduces electric efficiency, and causes the waste of a large amount of copper wire material in end; Rotor embeds in metallic sheath, and the fan-shaped part of the segmental rotor facewidth contacts with each other with between metallic sheath, rotor axial eddy current loss can be caused comparatively large, reduce electric efficiency.

Have a kind of single inner rotor core again, its rotor is split-type structural, and segmental rotor tooth block is embedded in not in magnetic conduction rotor metallic sheath, and stator is that U-shaped stator block consists of magnetic isolation plate, and U-shaped stator block yoke portion is wound with concentratred winding, and notch contains permanent magnet; Its winding technique is in yoke portion, little for axial length, the motor that diameter is large, can effectively reduce end wear and waste of material, but, for the motor that axial length is slightly grown, winding outside its stator yoke does not produce effective electromagnetic conversion, therefore, winding outside it also can be caused to produce useless copper loss, reduce electric efficiency, and the waste of material of outside winding.

Summary of the invention

The present invention aims to provide a kind of structure simple and performance and the good switched reluctance machines of efficiency.

To achieve these goals, the invention provides a kind of switched reluctance machines, comprising: external rotor; Internal rotor, be arranged on external rotor inside and together with external rotor coaxial rotation; Stator, between external rotor and internal rotor, the inner surface of stator has the multiple stator internal tooths protruded in radially direction, the outer surface of stator has the multiple stator external tooths protruded in radially direction, wherein, the both sides of the tooth tip of each stator internal tooth are provided with pole shoe in stator projectedly along the circumferential direction of internal rotor, and the both sides of the tooth tip of each stator external tooth are provided with stator external pole boots projectedly along the circumference of internal rotor, and the stator yoke of stator is wound with winding.

Further, external rotor comprises: shell; Multiple external rotor annular tooth block, is connected to the inner surface of shell and inner peripheral surface along shell is uniform.

Further, stator internal tooth and stator external tooth are along the circumference uniform distribution of stator.

Further, in stator, the thickness of pole shoe becomes large gradually by its pole tip to stator internal tooth, and the thickness of stator external pole boots becomes large gradually by its pole tip to stator external tooth.

Further, stator is connected to form by multiple iron core circumference.

Further, each iron core has two contact edges, and each contact edge all has lobe and groove, and lobe and the groove of adjacent two iron cores cooperatively interact adjacent two iron cores are connected.

Further, lobe on a contact edge of each iron core is positioned at the side of the close internal rotor of this contact edge, the groove of this contact edge is between the lobe and external rotor of this contact edge, groove on another contact edge of each iron core is positioned at the side of the close internal rotor of this another contact edge, and the lobe of this another contact edge is between the groove and external rotor of this another contact edge.

Further, the inner surface of each iron core has radially direction and protrudes the first stator internal tooth and the second stator internal tooth that arrange, the tooth tip of the first stator internal tooth is provided with pole shoe in the first stator projectedly along the circumferential direction of internal rotor, the tooth tip of the second stator internal tooth is provided with pole shoe in the second stator projectedly along the circumferential direction of internal rotor, and in the first stator, in pole shoe and the second stator, pole shoe is arranged in opposite directions; The outer surface of each iron core has radially direction and protrudes the first stator external tooth and the second stator external tooth that arrange, the tooth tip of the first stator external tooth is provided with the first stator external pole boots projectedly along the circumferential direction of internal rotor, the tooth tip of the second stator external tooth is provided with the second stator external pole boots projectedly along the circumferential direction of internal rotor, and the first stator external pole boots and the second stator external pole boots are arranged in opposite directions; Wherein, the first stator internal tooth and the second stator internal tooth of adjacent two iron cores form stator internal tooth jointly, and in the first stator of adjacent two iron cores, in pole shoe and the second stator, pole shoe forms pole shoe in stator jointly; First stator external tooth and the second stator external tooth of adjacent two iron cores form stator external tooth jointly, and the first stator external pole boots and the second stator external pole boots of adjacent two iron cores form stator external pole boots jointly.

Further, internal rotor comprises: fixed mount, has axis hole in the middle part of it; Multiple sector tooth block, is fixedly connected with fixed mount and circumference around fixed mount is uniform.

Further, fixed mount has the multiple dovetail grooves corresponding with multiple sector tooth block, sector tooth block is connected in corresponding dovetail groove one by one.

Further, fixed mount is made up of stainless steel or cast aluminium or plastics.

Further, the sector tooth block straight flange of sector tooth block and fixed mount have spacing distance.

Further, the sector tooth block base of sector tooth block and fixed mount have spacing distance.

Further, one of each winding circle limit is arranged in the first groove that corresponding stator yoke, stator external tooth and stator external pole boot-shaped become, another circle limit of this winding is arranged in the second groove that in corresponding stator yoke, stator internal tooth and stator, pole shoe is formed, switched reluctance machines is m phase motor, the winding of each stator yoke of homophase is separated by m-1 winding, and whole windings in series of homophase or in parallelly form a phase winding combination.

Further, the number of external rotor annular tooth block and one_to_one corresponding identical with the number of sector tooth block is arranged, and the center line of the corresponding external rotor annular tooth block arranged and the center line of sector tooth block are on same straight line.

Further, the fan-shaped straight flange of adjacent two sector tooth blocks be parallel to each other and distance for G _rb, the external rotor annular tooth block straight flange of adjacent two external rotor annular tooth blocks is parallel to each other and distance is G _ra, wherein, min (G _ra, G _rb) > 20L, L be gas length.

Further, the width of the first notch of the first groove is G _sa, the width of the second notch of the second groove is G _sb, wherein, G _sa> G _ra, G _sb> G _rb.

Further, 2L < G _sa-G _ra< 8L, 2L < G _sb-G _rb< 8L.

Further, the bottom of each sector tooth block has multiple spaced every magnetic aperture.

Further, the internal rotor block number of internal rotor is N _rb, the number of teeth of stator is N _sb, the internal rotor polar arc of internal rotor is β _rb, the stator internal tooth polar arc of stator internal tooth is β _sb, wherein,

$-\frac{\mathrm{\&pi;}}{N_{\mathrm{rb}}}+(\frac{1}{2}{\mathrm{\&beta;}}_{\mathrm{sb}}+{{\mathrm{\&beta;}}_{\mathrm{sb}}}^{\&prime;}-\frac{1}{2}{{\mathrm{\&beta;}}_{\mathrm{rb}}}^{\&prime;})>\mathrm{\&delta;}$

${{\mathrm{\&beta;}}_{\mathrm{sb}}}^{\&prime;}=\frac{2\mathrm{\&pi;}}{N_{\mathrm{sb}}}-{\mathrm{\&beta;}}_{\mathrm{sb}}$

${{\mathrm{\&beta;}}_{\mathrm{rb}}}^{\&prime;}=\frac{2\mathrm{\&pi;}}{N_{\mathrm{rb}}}-{\mathrm{\&beta;}}_{\mathrm{rb}}$

Wherein, δ be greater than 0 positive number.

Further, 2 °≤δ≤6 °.

Apply technical scheme of the present invention, provide a kind of switched reluctance machines.Switched reluctance machines comprises external rotor, internal rotor and stator.Internal rotor be arranged on external rotor inside and with external rotor coaxial rotation, stator is between external rotor and internal rotor.The inner surface of stator has the multiple stator internal tooths protruded in radially direction, and the outer surface of stator has the multiple stator external tooths protruded in radially direction.Wherein, the both sides of the tooth tip of each stator internal tooth are provided with pole shoe in stator projectedly along the circumferential direction of internal rotor, and the both sides of the tooth tip of each stator external tooth are provided with stator external pole boots projectedly along the circumference of internal rotor, and the stator yoke of stator is wound with winding.Stator contains pole shoe structure, is not reducing motor salient pole ratio, can promote winding fail safe under not reducing the prerequisite of motor performance, simultaneously lifting motor performance.Therefore the simple and performance of switched reluctance machines structure of the present invention and efficiency better.

Accompanying drawing explanation

The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 shows switched reluctance machines overall structure schematic diagram of the present invention;

Fig. 2 shows the overall structure schematic diagram of internal rotor of the present invention;

Fig. 3 shows the overall structure schematic diagram of stator of the present invention;

Fig. 4 shows the overall structure schematic diagram of iron core of the present invention;

Fig. 5 shows the overall structure schematic diagram of switched reluctance machines preferred embodiment of the present invention;

Magnetic circuit schematic diagram when Fig. 6 shows switched reluctance machines of the present invention 0 degree;

Magnetic circuit schematic diagram when Fig. 7 shows switched reluctance machines of the present invention 12 degree;

Magnetic circuit schematic diagram when Fig. 8 shows switched reluctance machines of the present invention 30 degree; And

Magnetic circuit schematic diagram when Fig. 9 shows switched reluctance machines of the present invention 45 degree.

Embodiment

It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.

As shown in Figure 1, the invention provides a kind of switched reluctance machines.

The stator 20 that switched reluctance machines of the present invention comprises external rotor 10, internal rotor 30 and is arranged between external rotor 10 and internal rotor 30.

Particularly, as shown in Figure 1 and Figure 5, internal rotor 30 be arranged on external rotor 10 inside and together with external rotor 10 coaxial rotation, stator 20 is between external rotor 10 and internal rotor 30.The one side towards internal rotor 30 of stator 20 and the inner surface of stator 20, the inner surface of stator 20 has the multiple stator internal tooths 21 protruded in radially direction.The one side deviating from internal rotor 30 of stator 20 and the outer surface of stator 20, the outer surface of stator 20 has the multiple stator external tooths 22 protruded in radially direction.Wherein, the both sides of the tooth tip of each stator internal tooth 21 are provided with pole shoe 211 in stator projectedly along the circumferential direction of internal rotor 30.The both sides of the tooth tip of each stator external tooth 22 are provided with stator external pole boots 221 projectedly along the circumference of internal rotor 30.Stator 20 has stator yoke 24, and stator yoke 24 is wound with winding.Yoke portion winding mode makes winding overhang greatly shorten, and reduces end copper loss and end waste.Such as, winding can for concentrating the mode of volume.

Because stator 20 has pole shoe structure, do not reducing motor salient pole ratio, under not reducing the prerequisite of motor performance, winding fail safe can promoted, simultaneously lifting motor performance.Therefore the simple and performance of switched reluctance machines structure of the present invention and efficiency better.

And then ground, due to the existence of pole shoe, the angle of power is smaller with tangential angle between the two to during stator teeth snap to make rotor tooth, and tangential magnetic pull component increases, and under identical output, motor noise obviously reduces.The magnetic potential that the dual-rotor structure of the application can farthest utilize winding to produce, reduces as much as possible by the copper loss in electromagnetic conversion process.Meanwhile, dual-rotor structure, makes winding effectively utilize part to increase, lifting motor efficiency.

As shown in Figure 1, external rotor 10 comprises shell 11 and multiple external rotor annular tooth block 12.Multiple external rotor annular tooth blocks 12 are connected to the inner surface of shell 11, and multiple external rotor annular tooth block 12 is uniform along the inner peripheral surface of shell 11.Such as, multiple external rotor annular tooth block 12 can weld or frock is connected to the inner surface of shell 11.

As shown in Figure 1, stator internal tooth 21 and stator external tooth 22 are along the circumference uniform distribution of stator 20.Make simple, and motor performance is stablized.

The present embodiment is not shown in the drawings, is specially, and in stator, the thickness of pole shoe 211 becomes greatly by its pole tip to stator internal tooth 21 gradually, and the thickness of stator external pole boots 221 becomes large gradually by its pole tip to stator external tooth 22.That is, in stator, the thickness of pole shoe 211 becomes large gradually by pole shoe in its pole tip to this stator 211 and the intersection of stator internal tooth 21, and the thickness of stator external pole boots 221 gradually becomes large to these stator external pole boots 221 with the intersection of stator internal tooth 21 by its pole tip.

As shown in Figure 3 and Figure 4, stator 20 is connected to form by multiple iron core 23 circumference, and adjacent iron core 23 is engaged by the groove of the outstanding tooth on contact edge and depression, connects cooperation simple firm again.Each iron core 23 has two contact edges 231, and the contact edge 231 of each iron core 23 all has lobe 232 and groove 233, and the lobe 232 of adjacent two iron cores 23 is mutually adaptive to make adjacent two iron cores 23 be connected with groove 233.Particularly, the lobe 232 on a contact edge 231 of each iron core 23 is positioned at the side of the close internal rotor 30 of this contact edge 231, between lobe 232 on this contact edge 231 of the groove 233 of this contact edge 231 and external rotor 10.Groove 233 on another contact edge 231 of each iron core 23 is positioned at the side of the close internal rotor 30 of this contact edge 231, between groove 233 on this contact edge 231 of the lobe 232 of this contact edge 231 and external rotor 10.

As shown in Figure 4, preferably, lobe 232 and groove 233 all V-shaped, multiple iron core 23 is connected by V-arrangement lobe 232 and v-depression 233.Stator 20 is connected to form by multiple iron core 23 circumference, can reduce the use amount of silicon steel sheet like this, cost-saving.

Further, as shown in Figure 4, the lobe 232 on a contact edge 231 of each iron core 23 is positioned at the outside of groove 233, and the lobe 232 on another contact edge 231 is positioned at the inner side of groove 233.It is more firm that such design makes adjacent iron core 23 connect.

And then ground, as shown in Figure 1, Figure 3 and Figure 4, the inner surface of each iron core 23 and the one side towards stator 20 of iron core 23 have radially direction and protrude the first stator internal tooth 21a and the second stator internal tooth 21b, the first stator internal tooth 21a that arrange and the second stator internal tooth 21b all extends towards the direction of stator 20.The tooth tip of the first stator internal tooth 21a is provided with pole shoe 211a in the first stator projectedly along the circumferential direction of internal rotor 30, the tooth tip of the second stator internal tooth 21b is provided with pole shoe 211b in the second stator projectedly along the circumferential direction of internal rotor 30, and in the first stator, in pole shoe 211a and the second stator, pole shoe 211b is arranged in opposite directions.In first stator, the bearing of trend of pole shoe 211a is circumferential direction along internal rotor 30 and towards the second stator internal tooth 21b, and in the second stator, the bearing of trend of pole shoe 211b is circumferential direction along internal rotor 30 and towards the first stator internal tooth 21a.

The outer surface of each iron core 23 and the one side deviating from stator 20 of iron core 23 have radially direction and protrude the first stator external tooth 22a and the second stator external tooth 22b, the first stator external tooth 22a that arrange and the second stator external tooth 22b all extends towards the direction deviating from stator 20.The tooth tip of the first stator external tooth 22a is provided with the first stator external pole boots 221a projectedly along the circumferential direction of internal rotor 30, the tooth tip of the second stator external tooth 22b is provided with the second stator external pole boots 221b projectedly along the circumferential direction of internal rotor 30, and the first stator external pole boots 221a and the second stator external pole boots 221b is arranged in opposite directions.The bearing of trend of the first stator external pole boots 221a is circumferential direction along internal rotor 30 and towards the second stator external tooth 22b, and the bearing of trend of the second stator external pole boots 221b is circumferential direction along internal rotor 30 and towards the first stator external tooth 22a.

In the above-described embodiments, the first stator internal tooth 21a and the second stator internal tooth 21b of adjacent two iron cores 23 form stator internal tooth 21 jointly, and in the first stator of adjacent two iron cores 23, in pole shoe 211a and the second stator, pole shoe 211b forms pole shoe 211 in stator jointly.First stator external tooth 22a and the second stator external tooth 22b of adjacent two iron cores 23 form stator external tooth 22 jointly, and the first stator external pole boots 221a and the second stator external pole boots 221b of adjacent two iron cores 23 form stator external pole boots 221 jointly.

As shown in Figure 2, internal rotor 30 comprises fixed mount 31 and multiple sector tooth block 32.The middle part of fixed mount 31 has axis hole 50, and multiple sector tooth block 32 is fixedly connected with fixed mount 31 and circumference around fixed mount 31 is uniform.

And then ground, as shown in Figure 2, fixed mount 31 has the multiple dovetail grooves corresponding with multiple sector tooth block 32, sector tooth block 32 is connected in corresponding dovetail groove one by one.Such as, a sector tooth block 32 is connected in a dovetail groove to make this sector tooth block 32 be connected with fixed mount 31.

Preferably, fixed mount 31 is made up of stainless steel or cast aluminium or plastics.

As shown in Figure 2, the sector tooth block straight flange 322 of sector tooth block 32 has spacing distance with fixed mount 31.Sector tooth block base 323 and the fixed mount 31 of sector tooth block 32 have spacing distance.The bottom of each sector tooth block 32 has multiple spaced every magnetic aperture 321.Meeting under mechanical strength condition, adjacent distance between magnetic aperture 321 is little as much as possible.Above-mentioned design, can reduce the eddy current loss in rotor core, lifting motor efficiency to greatest extent.

As shown in Fig. 1, Fig. 4 and Fig. 6 to Fig. 9, a circle limit 41 of each winding is arranged in the first groove of corresponding stator yoke 24, stator external tooth 22 and stator external pole boots 221 formation, another circle limit 42 of this winding is arranged in the second groove of corresponding stator yoke 24, stator internal tooth 21 and stator external pole boots 221 formation, the winding of each stator yoke 24 of homophase is separated by m-1 winding, and whole windings in series of homophase or in parallelly form a phase winding combination.

Stator winding can be made up of three-phase or heterogeneous independent winding.Such as, the switched reluctance machines in the present embodiment is three phase electric machine, the winding of a stator yoke 24 and the windings in series of another stator yoke 24 of its 2 stator yoke 24 of being separated by or in parallelly form a phase winding.Certain the present invention can comprise multiple slot number and coordinate, such as, and three-phase 6 groove 4 pole, three-phase 12 groove 8 pole, three-phase 24 groove 16 pole, four phase 8 groove 6 poles, four phase 16 groove 12 poles, four phase 24 groove 18 poles, five phase 10 groove 8 poles, five phase 20 groove 16 poles etc.

Preferably, the number of external rotor annular tooth block 12 and one_to_one corresponding identical with the number of sector tooth block 32 is arranged, and the center line of the corresponding external rotor annular tooth block 12 arranged and the center line of sector tooth block 32 are on same straight line, and the performance of motor reaches the best.Certainly, the center line of the corresponding external rotor annular tooth block 12 arranged also can on different straight line from the center line of sector tooth block 32, and namely when there is angle difference, motor performance can slightly decline, but is conducive to reducing torque pulsation.

As shown in Figure 5, the fan-shaped straight flange 322 of adjacent two sector tooth blocks 32 be parallel to each other and distance for G _rb, the external rotor annular tooth block straight flange 121 of adjacent two external rotor annular tooth blocks 12 is parallel to each other and distance is G _ra, be parallel to each other and sector tooth block 32, external rotor annular tooth block 12 can be made to be maximum with stator internal tooth 21, stator external tooth 22 at the area close to the contact in process, and the saturated pulsation caused in local can be reduced.Also help reduction minimum inductance, increase salient pole ratio, reduce due to the saturated torque pulsation caused in local simultaneously.Wherein, min (G _ra, G _rb) > 20L, i.e. G _raand G _rbminimum value all should be greater than 20 times of gas lengths, wherein, L is gas length.Air gap in the present embodiment refers to the difference half of diameter of stator bore and rotor diameter.

The magnetic potential that winding is set up, first by air gap, has a magnetic pressure to fall, if the distance of stator rabbet is large, then stator rabbet leakage field is large.On the contrary, due to the existence of air gap, rotor magnetic isolation unit is divided can be smaller.As shown in Figure 5, the width of the first notch 25 of the first groove is G _sa, the width of the second notch 26 of the second groove is G _sb, wherein, G _sa> G _ra, G _sb> G _rb.Preferably, 2L < G _sa-G _ra< 8L, 2L < G _sb-G _rb< 8L.The size relationship of such design, is conducive to reducing leakage field.

Be set as follows parameter, the internal rotor block number of internal rotor 30 is N _rb, the number of teeth of stator 20 is N _sb, the internal rotor polar arc of internal rotor 30 is β _rb, the stator internal tooth polar arc of stator internal tooth 21 is β _sb, in the present embodiment, for reducing torque pulsation further, and ensureing two-way startup, therefore should meet following relation between these parameters:

$-\frac{\mathrm{\&pi;}}{N_{\mathrm{rb}}}+(\frac{1}{2}{\mathrm{\&beta;}}_{\mathrm{sb}}+{{\mathrm{\&beta;}}_{\mathrm{sb}}}^{\&prime;}-\frac{1}{2}{{\mathrm{\&beta;}}_{\mathrm{rb}}}^{\&prime;})>\mathrm{\&delta;}$

${{\mathrm{\&beta;}}_{\mathrm{sb}}}^{\&prime;}=\frac{2\mathrm{\&pi;}}{N_{\mathrm{sb}}}-{\mathrm{\&beta;}}_{\mathrm{sb}}$

${{\mathrm{\&beta;}}_{\mathrm{rb}}}^{\&prime;}=\frac{2\mathrm{\&pi;}}{N_{\mathrm{rb}}}-{\mathrm{\&beta;}}_{\mathrm{rb}}$

Wherein, δ be greater than 0 positive number.

Preferably, in the above-described embodiments, 2 °≤δ≤6 °.

In the present embodiment, the iron core 23 of sector tooth block 32, external rotor annular tooth block 12 and stator 20 is overrided to form for stacking material such as silicon steel sheet or non-crystalline material.In particular, the rotor in the present invention adopts fraction block structure, can reduce the use amount of silicon steel sheet, cost-saving.

Present invention also offers four preferred embodiments of the magnetic circuit about switched reluctance machines, specific as follows:

As magnetic circuit schematic diagram when Fig. 6 shows switched reluctance machines of the present invention 0 degree: A phase starts conducting, be positioned at A Xiang Quan limit i.e. another circle limit 42 of stator yoke 24 inside, produce magnetic potential, magnetic circuit is closed by pole shoe 211, air gap, air gap 60 in stator yoke 24, stator internal tooth 21, stator; Be positioned at an A Xiang Quan limit i.e. circle limit 41 of stator yoke 24 outside, produce magnetic potential, magnetic circuit is closed by stator yoke 24, stator external tooth 22, stator external pole boots 221, air gap, air gap 60; Due to longer through air magnetic circuit, air gap flux density is low, and inner and outer Rotator starts to rotate, to rotate to 12 degree as Fig. 7 under magnetic pull effect.

Magnetic circuit schematic diagram when Fig. 7 shows switched reluctance machines of the present invention 12 degree: A is conducted, be positioned at an A Xiang Quan limit i.e. circle limit 41 of stator yoke 24 outside, produce magnetic potential, magnetic circuit is closed by the forward position of stator yoke 24, stator external tooth 22, stator external pole boots 221, air gap, external rotor annular tooth block 12; Be positioned at A Xiang Quan limit i.e. another circle limit 42 of stator yoke 24 inside, produce magnetic potential, magnetic circuit is closed by the forward position of pole shoe 211, sector tooth block 32 in stator yoke 24, stator internal tooth 21, stator, owing to being magnetic conduction substance through major part, the close increase of magnetic, magnetic pull increase and moment of torsion increases.

Magnetic circuit schematic diagram when Fig. 8 shows switched reluctance machines of the present invention 30 degree: A phase current is maximum, A phase magnetic circuit is substantially identical with Fig. 7, but along with magnetic conductive area increase, the close further increase of magnetic, but along with the alignment gradually of stator and rotor salient pole position, tangential magnetic pull starts to reduce; A phase moment of torsion exports and reduces; B phase starts conducting, and A phase starts to turn off; Now internal rotor 30, external rotor 10 the afterflow of A phase excitation and B Phase winding energization effect under, rotate to 30 degree.

Magnetic circuit schematic diagram when Fig. 9 shows switched reluctance machines of the present invention 45 degree: B is conducted, and B phase magnetic circuit is identical under 12 degree of positions with A phase, now, switches to B phase, according to the state of Fig. 7 and Fig. 8, continues to rotate after 60 degree, then switches to C phase; An electric cycle completes.

As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:

Because stator 20 has pole shoe structure, not reducing motor salient pole ratio, under not reducing the prerequisite of motor performance, promote winding fail safe, simultaneously lifting motor performance.Therefore the simple and performance of switched reluctance machines structure of the present invention and efficiency better.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (21)

1. a switched reluctance machines, is characterized in that, comprising:

External rotor (10);

Internal rotor (30), be arranged on described external rotor (10) inside and together with described external rotor (10) coaxial rotation;

Stator (20), be positioned between described external rotor (10) and described internal rotor (30), the inner surface of described stator (20) has multiple stator internal tooths (21) of protruding in radially direction, the outer surface of described stator (20) has multiple stator external tooths (22) of protruding in radially direction, wherein, the both sides of the tooth tip of each described stator internal tooth (21) are provided with pole shoe in stator (211) projectedly along the circumferential direction of described internal rotor (30), the both sides of the tooth tip of each described stator external tooth (22) are provided with stator external pole boots (221) projectedly along the circumference of described internal rotor (30), the stator yoke (24) of described stator (20) is wound with winding.

2. switched reluctance machines according to claim 1, is characterized in that, described external rotor (10) comprising:

Shell (11);

Multiple external rotor annular tooth block (12), is connected to the inner surface of described shell (11) and inner peripheral surface along described shell (11) is uniform.

3. switched reluctance machines according to claim 1, is characterized in that, described stator internal tooth (21) and described stator external tooth (22) are along the circumference uniform distribution of described stator (20).

4. switched reluctance machines according to claim 1, it is characterized in that, in described stator, the thickness of pole shoe (211) becomes greatly by its pole tip to described stator internal tooth (21) gradually, and the thickness of described stator external pole boots (221) becomes large gradually by its pole tip to described stator external tooth (22).

5. switched reluctance machines according to claim 2, is characterized in that, described stator (20) is connected to form by multiple iron core (23) circumference.

6. switched reluctance machines according to claim 5, it is characterized in that, each described iron core (23) has two contact edges (231), each described contact edge (231) all has lobe (232) and groove (233), and the described lobe (232) of adjacent two described iron cores (23) is mutually adaptive to make adjacent two described iron cores (23) be connected with described groove (233).

7. switched reluctance machines according to claim 6, it is characterized in that, described lobe (232) on a described contact edge (231) of each described iron core (23) is positioned at the side of the close described internal rotor (30) of this described contact edge (231), the described groove (233) of this described contact edge (231) is positioned between the described lobe (232) of this described contact edge (231) and described external rotor (10), described groove (233) on contact edge (231) described in another of each described iron core (23) be positioned at this another described in the side of close described internal rotor (30) of contact edge (231), the described lobe (232) of contact edge described in this another (231) be positioned at this another described between the described groove (233) of contact edge (231) and described external rotor (10).

8. switched reluctance machines according to claim 5, is characterized in that,

The inner surface of each described iron core (23) has radially direction and protrudes the first stator internal tooth (21a) and the second stator internal tooth (21b) that arrange, the tooth tip of described first stator internal tooth (21a) is provided with pole shoe (211a) in the first stator projectedly along the circumferential direction of described internal rotor (30), the tooth tip of described second stator internal tooth (21b) is provided with pole shoe (211b) in the second stator projectedly along the circumferential direction of described internal rotor (30), in described first stator, in pole shoe (211a) and described second stator, pole shoe (211b) is arranged in opposite directions,

The outer surface of each described iron core (23) has radially direction and protrudes the first stator external tooth (22a) and the second stator external tooth (22b) that arrange, the tooth tip of described first stator external tooth (22a) is provided with the first stator external pole boots (221a) projectedly along the circumferential direction of described internal rotor (30), the tooth tip of described second stator external tooth (22b) is provided with the second stator external pole boots (221b) projectedly along the circumferential direction of described internal rotor (30), described first stator external pole boots (221a) and described second stator external pole boots (221b) are arranged in opposite directions,

Wherein, the described first stator internal tooth (21a) of adjacent two described iron cores (23) and described second stator internal tooth (21b) form described stator internal tooth (21) jointly, pole shoe (211) in the described stator of the common formation of pole shoe (211b) in pole shoe (211a) and described second stator in described first stator of adjacent two described iron cores (23);

The described first stator external tooth (22a) of adjacent two described iron cores (23) and described second stator external tooth (22b) form described stator external tooth (22) jointly, and the described first stator external pole boots (221a) of adjacent two described iron cores (23) and described second stator external pole boots (221b) form described stator external pole boots (221) jointly.

9. switched reluctance machines according to claim 2, is characterized in that, described internal rotor (30) comprising:

Fixed mount (31), has axis hole (50) in the middle part of it;

Multiple sector tooth block (32), is fixedly connected with described fixed mount (31) and circumference around described fixed mount (31) is uniform.

10. switched reluctance machines according to claim 9, it is characterized in that, described fixed mount (31) has the multiple dovetail grooves corresponding with described multiple sector tooth block (32), described sector tooth block (32) is connected in corresponding described dovetail groove one by one.

11. switched reluctance machines according to claim 9, is characterized in that, described fixed mount (31) is made up of stainless steel or cast aluminium or plastics.

12. switched reluctance machines according to claim 9, is characterized in that, sector tooth block straight flange (322) and the described fixed mount (31) of described sector tooth block (32) have spacing distance.

13. switched reluctance machines according to claim 9, is characterized in that, sector tooth block base (323) and the described fixed mount (31) of described sector tooth block (32) have spacing distance.

14. switched reluctance machines according to claim 9, it is characterized in that, circle limit (41) of each described winding is arranged at corresponding described stator yoke (24), in the first groove that described stator external tooth (22) and described stator external pole boots (221) are formed, another circle limit (42) of this winding is arranged at corresponding described stator yoke (24), in the second groove that in described stator internal tooth (21) and described stator, pole shoe (211) is formed, described switched reluctance machines is m phase motor, the winding of stator yoke described in each of homophase (24) is separated by m-1 winding, and the whole described windings in series of homophase or the phase winding that formed in parallel combine.

15. switched reluctance machines according to claim 9, it is characterized in that, the number of described external rotor annular tooth block (12) and one_to_one corresponding identical with the number of described sector tooth block (32) is arranged, and the center line of the corresponding described external rotor annular tooth block (12) arranged and the center line of described sector tooth block (32) are on same straight line.

16. switched reluctance machines according to claim 14, is characterized in that, the fan-shaped straight flange (322) of adjacent two described sector tooth blocks (32) is parallel to each other and distance is G _rb, external rotor annular tooth block straight flange (121) of adjacent two described external rotor annular tooth blocks (12) is parallel to each other and distance is G _ra, wherein, min (G _ra, G _rb) > 20L, L be gas length.

17. switched reluctance machines according to claim 16, is characterized in that, the width of first notch (25) of described first groove is G _sa, the width of second notch (26) of described second groove is G _sb, wherein, G _sa> G _ra, G _sb> G _rb.

18. switched reluctance machines according to claim 17, is characterized in that, 2L < G _sa-G _ra< 8L, 2L < G _sb-G _rb< 8L.

19. switched reluctance machines according to claim 9, is characterized in that, the bottom of each described sector tooth block (32) has multiple spaced every magnetic aperture (321).

20. switched reluctance machines according to claim 1, is characterized in that, the internal rotor block number of described internal rotor (30) is N _rb, the number of teeth of described stator (20) is N _sb, the internal rotor polar arc of described internal rotor (30) is β _rb, the stator internal tooth polar arc of described stator internal tooth (21) is β _sb, wherein,

$-\frac{\mathrm{\&pi;}}{N_{\mathrm{rb}}}+(\frac{1}{2}{\mathrm{\&beta;}}_{\mathrm{sb}}+{{\mathrm{\&beta;}}_{\mathrm{sb}}}^{\&prime;}-\frac{1}{2}{{\mathrm{\&beta;}}_{\mathrm{rb}}}^{\&prime;})>\mathrm{\&delta;}$

${{\mathrm{\&beta;}}_{\mathrm{sb}}}^{\&prime;}=\frac{2\mathrm{\&pi;}}{N_{\mathrm{sb}}}-{\mathrm{\&beta;}}_{\mathrm{sb}}$

${{\mathrm{\&beta;}}_{\mathrm{rb}}}^{\&prime;}=\frac{2\mathrm{\&pi;}}{N_{\mathrm{rb}}}-{\mathrm{\&beta;}}_{\mathrm{rb}}$

Wherein, δ be greater than 0 positive number.

21. switched reluctance machines according to claim 20, is characterized in that, 2 °≤δ≤6 °.