阅读说明：本技术 一种爪型定子轭部嵌入永磁体辅助双转子轴向双凸极电机 (A kind of claw type stator yoke insertion permanent magnet auxiliary birotor axial direction double salient-pole electric machine ) 是由 刘爱民 王希鸿 娄家川 任达 于 2019-08-30 设计创作，主要内容包括：一种爪型定子轭部嵌入永磁体辅助双转子轴向双凸极电机,属于双凸极磁阻电机技术领域。所述爪型定子轭部嵌入永磁体辅助双转子轴向双凸极电机,包括机壳、第一转子、第二转子和爪型定子,第一转子和第二转子均固设在转轴上,与转轴同轴旋转,第一转子设置有若干个第一转子凸极,第二转子设置有若干个第二转子凸极,爪型定子设置有若干个与第一转子凸极对应的第一定子凸极,还设置有若干个与第二转子凸极对应的第二定子凸极,爪型定子的定子轭部对称设置有永磁体。所述爪型定子轭部嵌入永磁体辅助双转子轴向双凸极电机能够有效地提升输出转矩、在输出转矩相同的条件下降低电枢电流以及定子轭部损耗,提高电机运行效率,改善其性能指标。(A kind of claw type stator yoke insertion permanent magnet auxiliary birotor axial direction double salient-pole electric machine, belongs to double-salient reluctance motor technical field.The claw type stator yoke insertion permanent magnet assists birotor axial direction double salient-pole electric machine, including casing, the first rotor, the second rotor and claw type stator, the first rotor and the second rotor are installed in shaft, with shaft coaxial rotating, the first rotor is provided with several the first rotor salient poles, second rotor is provided with several the second rotor with salient pole, claw type stator is provided with several the first stator salient poles corresponding with the first rotor salient pole, several the second stator salient poles corresponding with the second rotor with salient pole are additionally provided with, the stator yoke of claw type stator is symmetrically arranged with permanent magnet.The claw type stator yoke insertion permanent magnet auxiliary birotor axial direction double salient-pole electric machine can effectively promote output torque, reduce armature supply and stator yoke loss under the same conditions in output torque, improve motor operation efficiency, improve its performance index.)

1. a kind of claw type stator yoke insertion permanent magnet assists birotor axial direction double salient-pole electric machine, which is characterized in that including casing, The first rotor, the second rotor and claw type stator；

The first rotor and the second rotor are installed in shaft, and with shaft coaxial rotating, the first rotor is provided with several The first rotor salient pole, the second rotor are provided with several the second rotor with salient pole；

The claw type stator is provided with several the first stator salient poles corresponding with the first rotor salient pole, be additionally provided with several with Corresponding second stator salient poles of second rotor with salient pole, the stator yoke of claw type stator are symmetrically arranged with permanent magnet.

2. claw type stator yoke insertion permanent magnet according to claim 1 assists birotor axial direction double salient-pole electric machine, special Sign is that the main body of the stator yoke is cylindrical structure, several described first stator salient poles are uniformly arranged on stator yoke The side in portion, several second stator salient poles are uniformly arranged on the inner wall of stator yoke.

3. claw type stator yoke insertion permanent magnet according to claim 1 or 2 assists birotor axial direction double salient-pole electric machine, It is characterized in that, the stator yoke is symmetrically embedded in two pieces of permanent magnets, and permanent magnet is located at two adjacent the second stator salient poles Between.

4. claw type stator yoke insertion permanent magnet according to claim 1 or 2 assists birotor axial direction double salient-pole electric machine, It is characterized in that, is wound with excitation winding in first stator salient poles.

5. claw type stator yoke insertion permanent magnet according to claim 4 assists birotor axial direction double salient-pole electric machine, special Sign is, is also wound with excitation winding in second stator salient poles.

6. claw type stator yoke insertion permanent magnet according to claim 1 or 2 assists birotor axial direction double salient-pole electric machine, Be characterized in that, the shell is provided with several magnet isolation tanks corresponding with the first stator salient poles, the first stator salient poles be installed in every In magnetic slot.

7. claw type stator yoke insertion permanent magnet according to claim 1 or 2 assists birotor axial direction double salient-pole electric machine, It is characterized in that, the claw type stator, the first rotor and the second rotor are formed by silicon steel plate stacking.

8. claw type stator yoke insertion permanent magnet according to claim 1 or 2 assists birotor axial direction double salient-pole electric machine, It is characterized in that, the first rotor salient pole is equal with the quantity of the second rotor with salient pole, and corresponding the first rotor salient pole and second Rotor with salient pole is arranged along same rectilinear direction.

9. claw type stator yoke insertion permanent magnet according to claim 1 or 2 assists birotor axial direction double salient-pole electric machine, It is characterized in that, first stator salient poles are equal with the quantity of the second stator salient poles, and corresponding first stator salient poles and second Stator salient poles are arranged along same rectilinear direction.

Technical field

The present invention relates to double-salient reluctance motor technical field, in particular to a kind of claw type stator yoke insertion permanent magnet is auxiliary Help birotor axial direction double salient-pole electric machine.

Background technique

Reluctance motor is since its driving circuit is simple, high reliablity, can keep efficient operation in the wider range of speeds The characteristics of, so that it is developed by leaps and bounds.But the leakage magnetic flux of the adjacent between cog of regular tap reluctance motor can generate negative torque to rotor, And electric current is bigger, number of poles is more (interpolar is apart from smaller), and interelectrode magnetic leakage influence is more significant, this will greatly influence going out for motor Power.Although electromagnetic principle and structure are all comparatively simple, magnetic circuit cyclically-varying simultaneously there are it is serious part saturation, design and Performance evaluation differs greatly with conventional motors.

Summary of the invention

In order to solve technical problem of the existing technology, the present invention provides a kind of claw type stator yokes to be embedded in permanent magnet Birotor axial direction double salient-pole electric machine is assisted, output torque can be effectively promoted, reduce electricity under the same conditions in output torque Pivot electric current and stator yoke loss, improve motor operation efficiency, improve its performance index.

To achieve the goals above, the technical scheme is that

A kind of claw type stator yoke insertion permanent magnet assists birotor axial direction double salient-pole electric machine, including casing, the first rotor, Second rotor and claw type stator；

The first rotor and the second rotor are installed in shaft, and shaft coaxial rotating, if the first rotor is provided with Dry the first rotor salient pole, the second rotor are provided with several the second rotor with salient pole；

The claw type stator is provided with several the first stator salient poles corresponding with the first rotor salient pole, is additionally provided with several A the second stator salient poles corresponding with the second rotor with salient pole, the stator yoke of claw type stator are symmetrically arranged with permanent magnet.

In above-mentioned technical proposal, it is provided with salient pole on stator and rotor and constitutes double-salient-pole structure, using claw type stator Stator yoke is embedded in permanent magnet additive excitation structure, reduces stator excitation indirectly by excitation effect of the permanent magnet in magnetic circuit Current drain, the addition of permanent magnet booster action realize the reduction of Stator energization current, effectively reduce stator excitation winding Copper loss, be effectively reduced stator and rotor cores loss, permanent magnetism ancillary technique is with claw type stator ining conjunction with, effective promotion air gap magnetic It is close, reduce leakage field.

The main body of the stator yoke is cylindrical structure, several described first stator salient poles are uniformly arranged on stator yoke The side in portion, several second stator salient poles are uniformly arranged on the inner wall of stator yoke.

In above-mentioned technical proposal, using stator every magnetic technology, several first stator salient poles are uniformly arranged on stator yoke Side reduce silicon steel material be lost and effectively reduce the leakage field between adjacent two salient pole of stator, additionally it is possible to effectively will be electric Machine magnetic circuit " planning " arrives particular path, reduces loss of the leakage field in no power phase and traditional stator yoke portion.

The stator yoke is symmetrically embedded in two pieces of permanent magnets, and permanent magnet be located at two adjacent the second stator salient poles it Between.

In above-mentioned technical proposal, on the one hand permanent magnet insertion stator yoke plays separated magnetic effect, is on the other hand effectively promoted Air gap flux density, two pieces of permanent magnets are symmetrical arranged the magnetic circuit that excitation winding can be cooperated to generate, the magnetic circuit for generating excitation winding with The magnetic circuit that permanent magnet generates effectively is superimposed.

Excitation winding is wound in first stator salient poles.

In above-mentioned technical proposal, it is wound with the excitation winding of identical the number of turns in each first stator salient poles, keeps magnetomotive force equal It is even.

Excitation winding is also wound in second stator salient poles.

In above-mentioned technical proposal, the first stator salient poles and the second stator salient poles are all wound with excitation winding, advise magnetic circuit more Model reduces leakage field to increase useful flux and increases the power output of motor.

The shell is provided with several magnet isolation tanks corresponding with the first stator salient poles, and the first stator salient poles are installed in every magnetic In slot.

In above-mentioned technical proposal, casing and shaft are coaxially disposed, and casing is made of magnetic separator, and magnet isolation tank and first is determined The quantity of sub- salient pole is equal, and the first stator salient poles are inserted into corresponding magnet isolation tank, while fixing the first stator salient poles Prevent it from falling off since electric machine rotor between cog generates magnetic torque.

The claw type stator, the first rotor and the second rotor are formed by silicon steel plate stacking.

In above-mentioned technical proposal, the quality of motor can be mitigated significantly using silicon steel plate stacking, reduce the rotation of motor Inertia.

The first rotor salient pole is equal with the quantity of the second rotor with salient pole, and corresponding the first rotor salient pole and second turn Sub- salient pole is arranged along same rectilinear direction.

In above-mentioned technical proposal, the first rotor and the second rotor are fixed on arranged in parallel in shaft, corresponding the first rotor It is not in circumferential alternate angle between salient pole and the second rotor with salient pole.

First stator salient poles are equal with the quantity of the second stator salient poles, and corresponding first stator salient poles are determined with second Sub- salient pole is arranged along same rectilinear direction.

Beneficial effects of the present invention:

(1) permanent magnet additive excitation structure is embedded in using the stator yoke of claw type stator, through permanent magnet in magnetic circuit Excitation effect reduces Stator energization current consumption indirectly, and the addition of permanent magnet booster action realizes subtracting for Stator energization current It is few, the copper loss of stator winding is effectively reduced, stator and rotor cores loss is effectively reduced, improves efficiency, permanent magnetism ancillary technique In conjunction with claw type stator, air gap flux density is effectively promoted, reduces leakage field；

(2) claw type stator structure is used, silicon steel material is reduced and is lost and effectively reduces and leaked between stator two neighboring pole Magnetic；

(3) since rotor needs good magnetic property, claw type stator, the first rotor and the second rotor are by silicon steel Piece, which is overrided to form, to be all made of silicon steel plate stacking and forms, and is significantly reduced the quality of motor, is reduced the rotary inertia of motor；

(4) claw type formula stator with effectively by motor magnetic circuit " planning " arrive particular path, reduce leakage field no power mutually with And the loss on casing；

(5) present invention actively follows low-loss and energy-saving principle, can be improved under unit mass motor output torque index and Adjacent stators between cog yoke portion flux loss is reduced, increases air gap flux density, reduces stator winding current under certain condition and closely reach Energy saving purpose.

Other features and advantages of the present invention will be partially described in detail in the following detailed description.

Detailed description of the invention

Fig. 1 is the stereoscopic schematic diagram of the first rotor of the embodiment of the present invention, the second rotor and the installation of claw type stator；

Fig. 2 is the axial cross-sectional views of the first rotor of the embodiment of the present invention, the second rotor and the installation of claw type stator；

Fig. 3 is the left view schematic diagram of Fig. 2；

Fig. 4 is the structural schematic diagram of claw type of embodiment of the present invention stator；

Fig. 5 is that the first rotor of the embodiment of the present invention and the second rotor are mounted on the schematic diagram in shaft；

Fig. 6 is the structural schematic diagram of casing of the embodiment of the present invention；

Fig. 7 is the entirety that claw type of embodiment of the present invention stator yoke is embedded in that permanent magnet assists birotor axial direction double salient-pole electric machine Schematic diagram；

Fig. 8 is the schematic diagram for the magnetic circuit that excitation winding of the embodiment of the present invention generates；

Fig. 9 is the schematic diagram for the magnetic circuit that permanent magnet of the embodiment of the present invention generates.

Appended drawing reference in Figure of description includes:

1- stator yoke, the first stator salient poles of 2-, the second stator salient poles of 3-, 4- the first rotor salient pole, the second rotor of 5- are convex Pole, 6- air gap, 7- permanent magnet, 8- shaft, 9- casing, 10- is every magnetic stripe, 11- excitation winding, the second rotor yoke of 12-, 13- every Magnetic slot, 14- the first rotor yoke portion.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.

In the description of the present invention, it should be noted that the orientation or position of the instructions such as term "inner", "outside", " side " Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, without referring to Show or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot manage Solution is limitation of the present invention.In addition, term " first ", " second " are used for description purposes only, and it should not be understood as instruction or dark Show relative importance.

In the description of the present invention, unless otherwise specified and limited, it should be noted that term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, the connection being also possible to inside two elements can , can also indirectly connected through an intermediary, for the ordinary skill in the art to be to be connected directly, it can basis Concrete condition understands the concrete meaning of above-mentioned term.

Of the existing technology in order to solve the problems, such as, as shown in Figures 1 to 9, the embodiment of the invention provides a kind of claw type Stator yoke is embedded in permanent magnet and assists birotor axial direction double salient-pole electric machine, can effectively promote output torque, in output torque Armature supply is reduced under the same conditions and stator yoke 1 is lost, and is improved motor operation efficiency, is improved its performance index.

As shown in Figures 1 to 7, a kind of claw type stator yoke 1 is embedded in permanent magnet 7 and assists birotor axial direction double salient-pole electric machine, Suitable for polyphase system, including casing 9, the first rotor, the second rotor and claw type stator, the first rotor and the second rotor are installed in In shaft 8, with 8 coaxial rotating of shaft, the first rotor is provided with several the first rotor salient poles 4, and the second rotor is provided with several A second rotor with salient pole 5, claw type stator are provided with several first stator salient poles 2 corresponding with the first rotor salient pole 4, also set up There are several second stator salient poles 3 corresponding with the second rotor with salient pole 5, the i.e. side of the first stator salient poles 2 of claw type stator setting Corresponding with the first rotor position, the side that the second stator salient poles 3 are arranged in claw type stator is corresponding with the second rotor-position, to realize electricity The polyphase system of machine works, and the stator yoke 1 of claw type stator is symmetrically arranged with permanent magnet 7.In the present embodiment, claw type stator yoke 1 Being embedded in permanent magnet 7 assists birotor axial direction double salient-pole electric machine to use three-phase system, and the first rotor and the bitrochanteric is fixed on shaft 8 On, claw type stator is fixed on casing 9, and 4 the first rotor salient poles 4 are uniformly distributed on the first rotor, are uniformly divided on the second rotor 4 the second rotor with salient pole 5 of cloth, claw type stator are circumferentially uniformly distributed 6 first the second stator salient poles of stator salient poles 2 and 6 3, and air gap 6 is provided between claw type stator and the first rotor, the second rotor, air gap 6 is 0.2-0.4mm, in the present embodiment Air gap 6 is 0.4mm.Shaft 8 is made of Steel material, claw type stator, the first rotor and the second rotor by silicon steel plate stacking and At can mitigate the quality of motor significantly using silicon steel plate stacking, reduce the rotary inertia of motor.

It is provided with salient pole on stator and rotor and constitutes double-salient-pole structure, stator and rotor are designed using salient pole type, utilize " magnetic Hinder minimum principle " tangential pulling force is generated, realize electric motor starting, braking, parking and four quadrant running.Using the stator of claw type stator Yoke portion 1 is embedded in 7 additive excitation structure of permanent magnet, reduces stator excitation indirectly by excitation effect of the permanent magnet 7 in magnetic circuit Current drain, the addition of 7 booster action of permanent magnet realize the reduction of Stator energization current, effectively reduce stator excitation winding 11 copper loss is effectively reduced stator and rotor cores loss, and permanent magnetism ancillary technique effectively promotes air gap magnetic in conjunction with claw type stator It is close, reduce leakage field.

As shown in Figures 1 to 4, the main body of stator yoke 1 is cylindrical structure, several first stator salient poles 2 are uniformly set It sets in the side of stator yoke 1, several the second stator salient poles 3 are uniformly arranged on the inner wall of stator yoke 1.In the present embodiment, 6 A first stator salient poles 2 are uniformly arranged on the side of stator yoke 1, and 6 the second stator salient poles 3 are uniformly arranged on stator yoke 1 Inner wall on, the main body of stator yoke 1 is cylindrical structure, and 1 main body of stator yoke is prolonged to the side of the first stator salient poles 2 of setting Stretch out 61 extensions of stator yoke for be arranged the first stator salient poles 2, the first stator salient poles 2 are located at close the first rotor salient pole 4 side.

Using stator every magnetic technology, silicon steel is reduced in the side that several first stator salient poles 2 are uniformly arranged on stator yoke 1 Sheet material is lost and effectively reduces the leakage field between adjacent two salient pole of stator, additionally it is possible to effectively arrive motor magnetic circuit " planning " Particular path reduces loss of the leakage field in no power phase and casing 9.

As shown in Figures 1 to 4, stator yoke 1 is symmetrically embedded in two pieces of permanent magnets 7, and permanent magnet 7 is located at adjacent two Between second stator salient poles 3.Permanent magnet 7 is embedded in 1 one side of stator yoke and plays separated magnetic effect, on the other hand effectively promotes air gap Flux density, two pieces of permanent magnets 7 are symmetrical arranged the magnetic circuit that excitation winding 11 can be cooperated to generate, the magnetic circuit for generating excitation winding 11 with The magnetic circuit that permanent magnet 7 generates effectively is superimposed.Stator current and motor output performance can reduce not using 7 additive excitation of permanent magnet Become, energy saving, since permanent magnet 7 and excitation winding 11 generate air gap flux density simultaneously in air gap 6, the addition of permanent magnet 7 can Air gap flux density promotion torque is increase accordingly to reduce exciting current accordingly.

As shown in Figure 1 to Figure 3, be wound with excitation winding 11 in the first stator salient poles 2, in each first stator salient poles 2 around There is the excitation winding 11 of identical the number of turns, keeps magnetomotive force uniform.Certainly, it can also be wound with excitation winding 11 in the second stator salient poles 3, First stator salient poles 2 and the second stator salient poles 3 are all wound with excitation winding 11, standardize magnetic circuit more, leakage field are reduced, to increase Useful flux increases the power output of motor.

In the present embodiment, identical the number of turns excitation winding 11, the second stator salient poles 3 are wound in each first stator salient poles 2 Above not around excitation winding 11, the first rotor salient pole 4 and the second rotor with salient pole 5 be not also around excitation winding 11, by claw type stator 6 11 rational deployment of excitation winding of a first stator salient poles 2 is uniformly divided into A, B, C three-phase, and A, B, C is connected in sequence, then motor is suitable Hour hands rotation；C, B, A are sequentially turned on, then motor rotates counterclockwise.

As shown in fig. 6, shell is provided with several magnet isolation tanks 13 corresponding with the first stator salient poles 2, the first stator salient poles 2 It is installed in magnet isolation tank 13.In the present embodiment, shell is provided with 6 magnet isolation tanks 13 corresponding with the first stator salient poles 2 respectively.

Casing 9 and shaft 8 are coaxially disposed, and casing 9 is made of magnetic separator, magnet isolation tank 13 and the first stator salient poles 2 Quantity is equal, and the first stator salient poles 2 are inserted into corresponding magnet isolation tank 13, are prevented while fixing the first stator salient poles 2 It falls off since electric machine rotor between cog generates magnetic torque, the protrusion between two neighboring magnet isolation tank 13 be every magnetic stripe 10, every Magnetic stripe 10 plays adjacent first stator salient poles, 2 magnetic fluxs of partition and plays fixed function to stator, solves energized phase excitation The technical issues of magnetic flux that winding 11 generates is leaked to no power phase stator reduces loss.

As shown in figure 5, the first rotor salient pole 4 is equal with the quantity of the second rotor with salient pole 5, and corresponding the first rotor salient pole 4 and second rotor with salient pole 5 along same rectilinear direction be arranged.The first rotor and the second rotor be fixed on it is arranged in parallel in shaft 8, it is right It is not in circumferential alternate angle between the first rotor salient pole 4 and the second rotor with salient pole 5 answered.

As shown in Figures 2 to 4, the first stator salient poles 2 are equal with the quantity of the second stator salient poles 3, and corresponding first is fixed Sub- salient pole 2 and the second stator salient poles 3 are arranged along same rectilinear direction.

The operation logic of above-mentioned claw type stator yoke insertion permanent magnet auxiliary birotor axial direction double salient-pole electric machine is as follows:

It is passed through electric current in a phase claw type stator excitation winding 11 in motor of the present invention and generates magnetomotive force, then claw type stator two End is respectively formed the pole N and the pole S, and the magnetic circuit of the motor is the magnetomotive force effect superposition of a phase excitation winding 11 and the generation of permanent magnet 7, As shown in figure 8, a phase excitation winding 11 generate magnetic circuit: first stator salient poles 2,6, the first rotor salient poles 4 of air gap, The first rotor yoke portion 14, another the first rotor salient pole 4, air gap 6, another first stator salient poles 2, stator yoke 1, one Two stator salient poles 3,6, second rotor with salient pole 5 of air gap, the second rotor yoke 12, another second rotor with salient pole 5, air gap 6, 1, another second stator salient poles 3, stator yoke first stator salient poles 2；As shown in figure 9, the magnetic circuit that permanent magnet 7 generates: The pole permanent magnet 7N, 1, second stator salient poles 3 of stator yoke, air gap 6, the second rotor with salient pole 5, second rotor yokes 12, another second rotor with salient pole 5, air gap 6, another second stator salient poles 3, stator yoke 1, the pole permanent magnet 7S.Due to fixed Sub- yoke portion 1 is added permanent magnet 7 and forms two sets of independent magnetic circuits, is connected with phase excitation winding 11 by series system, driving electricity The magnetomotive force superposition that machine operating, permanent magnet 7 and excitation winding 11 generate respectively generates air gap magnetic in two sets of closed magnetic circuits It is close.Tangential pulling force is generated according to " magnetic resistance minimum principle ", is sequentially turned on by controlling excitation winding 11, motor can be made to rotate, forever The addition of magnet 7 makes total magnetomotive force in magnetic circuit increase and then reinforce air gap flux density in magnetic circuit, therefore can be using smaller excitation electricity Stream realizes that air gap 6 gives flux density effect.

Make motor magnetic flux specific using the structure for being embedded in permanent magnet 7 every magnetic means and stator yoke 1 of claw type stator Path (i.e. the magnetic circuit that the magnetic circuit and permanent magnet 7 that a phase excitation winding 11 generates generate) conducting, effectively reduces no power stator side Dispersion loss, generate unnecessary loss.Due to can reduce stator current using 7 additive excitation of permanent magnet and motor exports Performance is constant, energy saving.The addition of 7 booster action of permanent magnet realizes the reduction of Stator energization current, and it is fixed to effectively reduce The copper loss of sub- winding improves efficiency aspect.The concrete principle of 7 ancillary technique of permanent magnet is as follows:

The electromagnetic torque of switched reluctance machines can be calculated from energy converting between mechanical angle according to magnetic coenergy:

In formula, T_emIt is electromagnetic torque,It is magnetic coenergy, i is phase current,It is magnetic linkage, θ is that rotor turns over angle Degree.

When motor operation, after being passed through phase current, ignore reluctance torque component caused by mutual inductance, then motor output effectively turns Square is made of self-induction reluctance torque and permanent-magnet torque two parts.One phase torque are as follows:

Wherein

In formula, T_epEffective electromagnetic torque is exported for p phase；T_rpFor p phase self-induction reluctance torque, T_mpFor p phase permanent-magnet torque, i_p For p phase current, L_pFor p phase winding inductance, ψ_mpFor 7 magnetic linkage of permanent magnet.In T_epIn the case where constant, since permanent magnet 7 provides one Determine torque T_mp, therefore can accordingly reduce input current.

The prior art can be used in motor fixation device in use in the present invention, without limitation.For the control for realizing motor System and detection, the present invention also mountable position sensor and current sensor, the routine for being all made of motor in the prior art are set It sets, without limitation.The present invention connects with phase excitation winding 11 and controls on-off with a switching tube (IGBT), using existing skill The setting of art, without limitation.

The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.