CN115694125A - Anti-step-out stator excitation type field modulation axial magnetic gear - Google Patents
Anti-step-out stator excitation type field modulation axial magnetic gear Download PDFInfo
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Abstract
The invention discloses an anti-step-out stator excitation type field modulation axial magnetic gear, and relates to the field of magnetic gears. The driving rotor and the driven rotor are respectively arranged on two sides of the stator. The invention utilizes the interaction of the air gap flux density specific harmonic wave and the introduced winding in the asynchronous operation stage of the magnetic gear to generate net driving torque acting on the driven rotor, thereby obviously improving the anti-step-out capability of the magnetic gear in the transient operation stage, simultaneously, the induced current of the damping winding of the magnetic gear in the steady operation stage is zero, and the introduced damping winding can not influence the transmission quality of the magnetic gear; the magnetic gear adopts stator excitation to replace traditional rotor excitation, clamps and protects the permanent magnet with high price and high brittleness in a block manner by the stator iron core, not only can avoid the permanent magnet from falling off, but also can ensure that the damping winding and the permanent magnet are mutually independent in installation space and do not interfere with each other in the aspect of geometric parameter design, and improves the mechanical reliability and the design freedom of the magnetic gear.
Description
Technical Field
The invention belongs to the technical field of magnetic gears, and particularly relates to an anti-step-out stator excitation type field modulation axial magnetic gear.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the field of industrial driving, the contradiction between the working rotation speed singleness of a prime motor and the working rotation speed diversity of a driven load generally exists, and the adoption of a mechanical gear for speed change transmission is an effective way for solving the contradiction. The mechanical gear has the advantages of strong torque transmission capacity, compact space structure and the like, but the transmission equipment has a series of insurmountable defects and defects caused by the friction between the teeth of two adjacent wheels in the operation stage, such as: the operation noise is large, and the heat loss is large; (2) lubrication and regular maintenance are needed, and the operation cost is high; (3) irreversible damage risks such as tooth breakage exist during overload; (4) The reliability is poor, and the transmission system is one of components with high failure rate. In addition, the mechanical gear cannot be applied to special occasions where the input end and the output end need to be physically isolated due to the limitation of the transmission form of the mechanical gear.
In view of the above-mentioned drawbacks of mechanical gears, in recent years, researchers at home and abroad have conducted extensive research on non-contact type variable transmission devices, and magnetic gears have come to be used. The magnetic gear realizes non-contact transmission of adjacent rotors by means of acting force between the permanent magnets, so that various problems caused by contact transmission can be avoided. Early magnetic gears were mostly directly modeled by mechanical gears, and more typical ones include straight-toothed spur magnetic gears, parallel-axis spur magnetic gears, spur worm magnetic gears, bevel worm magnetic gears, involute magnetic gears, and planetary magnetic gears. The mechanical-simulated magnetic gears replace the tooth groove meshing of a mechanical gear by utilizing the mutual coupling of the magnetic fields of the permanent magnets, and although the non-contact variable-speed transmission can be realized, only a small part of the permanent magnets participate in the work in the operation stage, so that the ideal torque transmission capacity is not provided, and the practical application value is not high.
In 2001, d.howe et al abandoned a traditional design of simply imitating mechanical gears, and developed a new approach, and proposed a field modulation magnetic gear based on a magnetic field modulation theory, the structure of which is shown in fig. 1. The magnetic gear is formed by coaxially sleeving a magnetic adjusting circular ring and driving rotors and driven rotors which are positioned on the inner side and the outer side of the circular ring along the radial direction. The rotating speeds of the driving rotor and the driven rotor are not equal, but after the action of the magnetic regulating ring, the permanent magnet of the driving rotor can generate a modulated magnetic field with the same rotating speed and the same pole number as those of the permanent magnet of the driven rotor in an adjacent air gap of the driven rotor, and the modulated magnetic field is coupled with the self excitation magnetic field of the permanent magnet of the driven rotor so as to generate constant torque acting on the driven rotor and finally realize stable non-contact variable speed transmission. Compared with an imitation mechanical magnetic gear with a lower permanent magnet utilization rate, the field modulation magnetic gear can ensure that all permanent magnets participate in magnetic field coupling and torque generation in the operation stage, and the torque transmission capacity of the field modulation magnetic gear is comparable to that of a common mechanical gear.
Since non-contact variable speed transmission can be realized and the torque transmission capability meets the requirements of engineering application, the field modulation magnetic gear is widely concerned once being produced. To date, scholars at home and abroad adopt a plurality of technical measures to improve the field modulation magnetic gear from different angles, and the technical measures are specifically summarized as the following five aspects:
(1) Changing the magnetizing arrangement mode of permanent magnets
The permanent magnet is a core component of the field modulation magnetic gear capable of realizing non-contact power transmission, and naturally becomes a primary concern for realizing the performance improvement of the gear. Besides adopting high-quality permanent magnet materials, improving the magnetizing arrangement mode of the permanent magnets is an effective means for enhancing the working performance of the field modulation magnetic gear. For example, compared with a common surface-mounted type polarity positive and negative alternating permanent magnet array, the Ha-bach type permanent magnet array can effectively improve the air gap flux density waveform distribution, further weaken torque pulsation and reduce iron core loss; the magnetic flux density can be improved by utilizing the magnetism gathering effect by adopting the permanent magnet built-in arrangement mode; the arrangement mode of the permanent magnets with alternating poles can reduce the using amount of the permanent magnets on the premise of ensuring that the torque density of the magnetic gear is basically unchanged, so that the material cost of the gear is reduced, and the cost performance of the gear is improved; the Ha-bach type permanent magnet array with the variable pole width is matched with the air gaps with different thicknesses or the built-in permanent magnet array, so that the increasing effect of each matching element on the effective harmonic component of the air gap flux density can be exerted, and further the torque transmission capability of the field modulation magnetic gear is improved.
(2) Changing structure and material of magnetic regulating ring
As a key medium for magnetic field coupling of driving and driven rotors of the field modulation magnetic gear, the magnetic modulation ring is also a key focus object in the field of research of the gear. Korean university y.j.kim et al, performed comparative analysis on magnetic gear transmission performance when the shape of the magnetic conducting block of the exchange magnet ring was changed, and further proposed a structure of a magnetic conducting block with a wide inner part and a narrow outer part. The calculation result shows that the maximum torque of the inner rotor and the outer rotor of the magnetic gear can be effectively improved and the torque pulsation can be reduced by adopting the novel magnetic conduction block. The canadian kali university a.m.kni ght et al replaces the magnetic modulating ring with a magnetic conductive block interconnection type structure from a traditional magnetic conductive block independent combination type structure. Each layer of silicon steel sheet of the structure can realize complete modulation of an air gap magnetic field in a corresponding axial range, and the material consumption and the processing cost are remarkably reduced compared with those of the traditional magnetic adjusting ring. Liu Xiao et al of Hunan university in China put forward a double-ring modulation coaxial magnetic gear structure. According to the structure, the effective inhibition of the flux leakage between the outer rotor poles and the remarkable increase of the working harmonic amplitude of the air gap flux density are realized by adding the auxiliary flux adjusting ring, and the corresponding torque transfer capacity is obviously improved compared with that of a common single-ring structure.
To enhance mechanical strength, the magnetic control ring is usually made of solid epoxy resin to form the non-magnetic conductive part of the component during the manufacturing process. Because the epoxy resin can not play a complete magnetic resistance role, when the magnetic saturation degree of the magnetic conduction block is higher, part of magnetic lines of force can pass through the epoxy resin and form local magnetic leakage. Under the influence of the magnetic field, the modulation effect and the magnetic field transmission efficiency of the magnetic adjusting ring are reduced. Aiming at the problem, the shaft soldiers and the like in the university of the three gorges adopt high-temperature superconducting materials to replace epoxy resin to form a non-magnetic-conducting part of the magnetic regulating ring, and the magnetic field shielding effect of the materials at the critical temperature is utilized to inhibit local magnetic leakage among magnetic conducting blocks, so that the effective harmonic amplitude of the air-gap magnetic density of the magnetic gear is modulated on site, and the torque transmission performance is improved correspondingly.
(3) Changing the direction of the magnetic flux
The common field modulation magnetic gear is mostly designed and manufactured based on a radial excitation structure. Because the inner rotor and the outer rotor need to be led out of the rotating shaft and can only be fixed by adopting a unilateral supporting mode, the radial excitation field modulation magnetic gear has higher processing difficulty, and the dynamic balance performance of the rotor is difficult to be fully ensured. In view of the above problems with the radial structure, the axial magnetic flux field modulation magnetic gear is obtained by replacing the radial excitation with the axial excitation in the case of the kaochiton et al, shanghai university. This field modulation magnetic gear high speed rotor, low speed rotor and transfer magnetic ring mutually noninterfere on installation space, rotor shaft both ends all can use the bearing to support, compare with radial structure, and its part assembly degree of difficulty and rotor axial eccentricity probability all show the decline. Li yong et al, harabin university, moves the field modulation ring between the high and low speed rotors of the axial field modulation magnet gear to the outside of both rotors, thereby resulting in a transverse flux field modulation magnet gear. The magnetic gear still has the advantages of convenient processing and high mechanical stability, and can be used for realizing variable speed transmission in high-power occasions. The Fumingwang et al of hong Kong university of tally bends the magnetic conduction block of the transverse magnetic flux field modulation magnetic gear, thereby solving the problem of the singularization of the power transmission direction when the magnetic gear adopts a coaxial structure. An axial-transverse magnetic flux composite field modulation magnetic gear is proposed by the you being equal to Zhejiang university. The magnetic gear magnetic conduction block can modulate an axial magnetic field and an end radial magnetic field generated by the rotor permanent magnet at the same time, and has more excellent torque transmission capacity compared with a field modulation magnetic gear with the same specification and a single axial or single transverse structure.
(4) Changing the form of movement
The driving part and the driven part of the traditional field modulation magnetic gear do rotary motion when the speed is changed. The K.Ata l l ah et al of the university of Sheffield, UK proposes a cylindrical linear field modulation magnetic gear structure based on a magnetic field modulation principle, and the structure expands the motion form of a magnetic gear from rotary motion to linear motion. The Zhaoxing congratulation of southeast university and the like provide a linear-rotary two-degree-of-freedom field modulation magnetic gear to further realize the relative speed conversion of two motion forms of linear and rotary.
(5) Transient transmission performance improvement
The damping conducting bars are added in the rotor core, which is a common method for restraining transient oscillation of the traditional permanent magnet motor. The American university of Texas agriculture industry proposes a field modulation magnetic gear containing a cage-type winding based on the same idea. The magnetic gear can effectively reduce the rotating speed oscillation amplitude in the transient operation stage through the damping torque generated by the interaction of the permanent magnet modulation magnetic field and the squirrel cage conducting bar, and the adjusting time is shortened. The structure can also improve the transient transmission performance of the magnetic gear by utilizing the damping torque provided by the squirrel cage guide bars.
It is not difficult to find out that the technical measures can enhance the steady-state and transient-state running performance of the field modulation magnetic gear, but still can not solve three problems of the variable speed transmission device in the practical application process, namely:
1. the asynchronous net driving torque of the field modulation magnetic gear is zero, and the synchronous holding capacity in the transient transmission stage is difficult to meet the actual requirement.
The field modulation magnetic gears are mutually coupled by virtue of the excitation magnetic fields of the permanent magnets to generate electromagnetic torque, and the torque shows a pulsating torque with a direct-current component equal to zero in the asynchronous operation stage of the magnetic gears and has no slip characteristic. When the input rotation speed or the load torque changes suddenly, the working state of the field modulation magnetic gear is changed from synchronous operation to asynchronous operation, and the driven rotor is easy to lose step under the alternating action of positive and negative torques. From the practical application point of view, the working quality of the field modulation magnetic gear not only depends on the torque transmission capacity in stable operation, but also depends on the synchronous maintaining capacity after the working condition is changed, and the capacity is just the 'soft rib' and the 'short plate' of the field modulation magnetic gear.
2. The air gap flux density invalid harmonic ratio of the field modulation magnetic gear is high, and a plurality of adverse effects can be caused by simply introducing a cage type winding.
Different from a permanent magnet motor with dominant air gap flux density fundamental component, the field modulation magnetic gear air gap flux density invalid harmonic has larger amplitude and more content. If a cage type winding is added in a driven rotor of the device for improving the anti-step-out capacity, the electromagnetic torque generated by the interaction of the air gap flux density invalid harmonic and the squirrel cage conducting bar can greatly offset the asynchronous driving torque generated by the corresponding effective harmonic, and can also interfere with the stable transmission of the magnetic gear. In addition, squirrel cage eddy current losses due to the inactive harmonics can also reduce magnetic gear transmission efficiency.
3. The permanent magnet of the field modulation magnetic gear rotor has the risk of falling under the action of radial centrifugal force, and the mechanical reliability is poor.
A traditional field modulation magnetic gear generally adopts a rotor excitation structure, under the long-term working or high-speed running state, a permanent magnet which synchronously rotates along with a rotor is easy to displace and even fall off under the action of radial centrifugal force, and the integral transmission stability and mechanical reliability of the magnetic gear are difficult to fully ensure. In addition, even if the negative influence caused by the introduction of the cage-shaped winding is not considered, the original installation space of the permanent magnet is inevitably occupied by the cage conducting bars embedded on the surface of the driven rotor of the traditional field modulation magnetic gear, and the size design of the cage conducting bars and the size design of the driven rotor can interfere with each other.
Disclosure of Invention
The invention aims to provide an anti-step-out stator excitation type field modulation axial magnetic gear, which can generate driving property induction torque acting on a driven rotor under the asynchronous state that the rotating speeds of the driving rotor and the driven rotor do not meet a stable transmission ratio, so that the rotating speed of the driven rotor can be timely changed along with the rotating speed of the driving rotor under the sudden change working conditions of instantaneous operation, input rotating speed or sudden increase and decrease of connected loads and the like, and the step-out phenomenon is avoided; under the synchronous state that the rotating speeds of the driving rotor and the driven rotor meet the stable transmission ratio, the magnetic gear does not generate the induction torque acting on the driven rotor, so that the stable operation of the magnetic gear is not influenced; the magnetic gear adopts stator excitation to replace traditional rotor excitation, and clamps and protects the permanent magnet with high price and high brittleness by the stator iron core, thereby fundamentally avoiding the phenomenon that the permanent magnet falls off caused by the action of centrifugal force when the common rotor excitation type field modulation magnetic gear is in a high-speed operation state, ensuring that the damping winding and the permanent magnet are mutually independent in installation space and do not mutually interfere in geometric parameter design, further improving the mechanical reliability and the design freedom of the magnetic gear, and further effectively solving the prior technical problems given in the foregoing.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention relates to an excitation type field modulation axial magnetic gear of an anti-step-out stator, which comprises a stator, a driving rotor and a driven rotor which are coaxially arranged, wherein the driving rotor and the driven rotor are respectively arranged at two sides of the stator.
Preferably, the stator comprises stator core blocks and stator permanent magnets arranged between the stator core blocks, the number of pole pairs of the stator permanent magnets is P, and P is a positive integer.
Preferably, the stator core segments both provide clamping protection for the stator permanent magnets and also constitute a magnetically conductive medium.
Preferably, the driving rotor comprises driving rotor magnetic conduction blocks and driving rotor non-magnetic conduction blocks, the circumferential widths of the driving rotor magnetic conduction blocks are the same and are in non-uniform symmetrical distribution along the circumferential direction, and the driving rotor non-magnetic conduction blocks are filled between the driving rotor magnetic conduction blocks.
Preferably, the number of the magnetic conducting blocks of the driving rotor and the number of the non-magnetic conducting blocks of the driving rotor are both 2Z, Z is a positive integer, and Z is less than P.
Preferably, the driven rotor comprises driven rotor magnetic conduction blocks and driven rotor non-magnetic conduction blocks, the driven rotor magnetic conduction blocks are the same in circumferential width and are uniformly and symmetrically distributed along the circumferential direction, and the driven rotor non-magnetic conduction blocks are filled between the driving rotor magnetic conduction blocks.
Preferably, the number of the driven rotor magnetic conduction blocks and the number of the driven rotor non-magnetic conduction blocks are both 2 (P-Z).
Preferably, the inner surface of the magnetic conducting block of the driven rotor, which is contacted with the air gap, is uniformly grooved, and the number of the grooves is 4 (P-Z). And the I-th damping winding are embedded in the slot.
Preferably, the damping winding set I and the damping winding set II are both double-layer integer pitch windings.
Preferably, the number of pole pairs of the damping winding I and the damping winding I is P-Z, and the axes of the damping winding I and the damping winding I are different by 90 electrical angles, so that two-phase symmetrical damping windings are formed.
The invention has the following beneficial effects:
1. the two-phase symmetrical damping winding is embedded on the surface of the driven rotor, the net driving torque acting on the driven rotor can be generated by utilizing the interaction of the air gap flux density specific harmonic and the introduced winding in the asynchronous operation stage of the magnetic gear, so that the anti-step-out capacity of the magnetic gear in the transient operation stage is obviously improved, meanwhile, the induced current of the damping winding in the steady operation stage of the magnetic gear is zero, and the introduced damping winding cannot influence the transmission quality of the magnetic gear.
2. The invention ensures that the damping winding can completely shield the air gap flux density invalid harmonic wave in the asynchronous operation stage and all the harmonic waves of the air gap flux density in the synchronous operation stage of the magnetic gear by reasonably selecting the pole pair number of the damping winding, thereby avoiding the negative influence of various harmonic waves on the improvement of the anti-step-out capability of the magnetic gear, the stable operation and the transmission efficiency.
3. The invention adopts stator excitation to replace traditional rotor excitation, clamps and protects the stator permanent magnet with high price and high brittleness by the stator iron core of the stator in blocks, not only can avoid the permanent magnet from falling off, but also can ensure that the damping winding and the permanent magnet are mutually independent in the aspect of installation space and do not interfere with each other in the aspect of geometric parameter design, thereby improving the mechanical reliability and the design freedom of the magnetic gear.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a common field modulated magnetic gear structure.
Fig. 2 is a schematic structural view of an excitation type field modulation axial magnetic gear of an anti-step-out stator according to the invention.
Fig. 3 is a connection diagram of the damping windings of the driven rotor of the anti-step-out stator excitation type field modulation axial magnetic gear.
Fig. 4 is a diagram of main harmonic components of the magnetic densities of adjacent air gaps of a driven rotor of the anti-step-out stator excitation type field modulation axial magnetic gear.
Fig. 5 is a time-varying simulation curve of the rotating speed of the driven rotor when the rotating speed of the driving rotor increases at the same rate for the anti-step-out stator excitation type field modulation axial magnetic gear of the invention and the common field modulation magnetic gear shown in fig. 1.
Fig. 6 is a time-varying simulation curve of the current of the damping winding of the driven rotor of the excitation type field modulation axial magnetic gear of the anti-step-out stator under the working condition corresponding to fig. 5.
In the drawings, the reference numbers indicate the following list of parts:
1-1 magnetic adjusting circular ring magnetic conduction block, 1-2 magnetic adjusting circular ring non-magnetic conduction block, 1-3 outer rotor permanent magnet, 1-4 inner rotor permanent magnet, 1-5 inner air gap, 1-6 outer air gap, 1-7 outer rotor iron core and 1-8 inner rotor iron core;
the motor comprises a stator 2-1-0, a driving rotor 2-3-0, a driven rotor 2-5-0, a stator permanent magnet 2-1, a stator iron core 2-2, a driving rotor 2-3, a driving rotor magnetic conduction block 2-4, a driving rotor magnetic conduction block 2-5, a driven rotor magnetic conduction block 2-6, a driven rotor non-magnetic conduction block 2-7, a damping winding I2-8, and a damping winding I2-8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "middle", "outer", "inner", "lower", "around", and the like, indicate orientations or positional relationships, are used merely to facilitate the description of the present invention and to simplify the description, and do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.
The first embodiment is as follows:
as shown in figure 2, the anti-step-out stator excitation type field modulation axial magnetic gear comprises three basic components, namely a stator 2-1-0, a driving rotor 2-3-0 and a driven rotor 2-5-0. Wherein:
the stator 2-1-0 is composed of stator permanent magnets 2-1 (P is a positive integer) with the number of pole pairs equal to P and stator iron core blocks 2-2, and the stator iron core blocks not only provide clamping protection for the stator permanent magnets but also form magnetic conduction media.
The driving rotor 2-3-0 comprises a driving rotor magnetic conduction block 2-3 and a driving rotor non-magnetic conduction block 2-4, the number of the components of the driving rotor magnetic conduction block 2-3 and the driving rotor non-magnetic conduction block 2-4 is 2Z (Z is a positive integer and Z < P), the circumferential width of each component of the driving rotor magnetic conduction block 2-3 is the same, the components are in non-uniform symmetrical distribution along the circumferential direction, and each component of the driving rotor non-magnetic conduction block 2-4 is filled between each component of the driving rotor magnetic conduction block 2-3.
The driven rotor 2-5-0 comprises a driven rotor magnetic conduction block 2-5 and a driven rotor non-magnetic conduction block 2-6, and the number of the driven rotor magnetic conduction block 2-5 and the driven rotor non-magnetic conduction block 2-6 is equal to 2 (P-Z). The circumferential widths of all the components of the magnetic conduction blocks 2-5 of the driven rotor are the same and are uniformly and symmetrically distributed along the circumferential direction; the non-magnetic conductive blocks 2-6 of the driven rotor are filled between the magnetic conductive blocks 2-5 of the driven rotor.
As shown in fig. 3, each group of the driven rotor magnetic conduction blocks 2-5 and the contact inner surface of the air gap are uniformly grooved along the circumferential direction, the number of the grooves is 4 × (P-Z), and the groove pitch angle is 360/4/(P-Z) = 90/(P-Z) degrees (mechanical angle). The I-th damping winding 2-7 and the I-th damping winding 2-8 are embedded in the groove. The two sets of damping windings are double-layer windings with the coil pitch equal to two slots. The coil sides of the upper layer and the lower layer of each slot belong to the same damping winding, and the coil sides in the adjacent slots belong to different damping windings, so that the two sets of damping windings jointly form two-phase symmetrical damping windings with the same pole pair number (P-Z) and the mutual difference of axes of 90/(P-Z) × (P-Z) =90 degrees (electrical angle).
The driving rotor 2-3-0 and the driven rotor 2-5-0 both generate modulation action on the excitation magnetic field of the stator permanent magnet 2-1.
The operation principle of the invention is as follows:
for the anti-step-out stator excitation type field modulation axial magnetic gear (as shown in fig. 2) of the embodiment of the invention, the rotating speeds of the driving rotor and the driven rotor are respectively recorded as-omega i 、Ω o (Ω i >0，Ω o >0) (ii) a The stator permanent magnet 2-1 is modulated by the driving rotor and the driven rotor respectively to generate an air gap magnetic signature B in the adjacent air gap of the driven rotor i 、B o . B is obtained by calculation i 、B o The number of pole pairs and the rotational speed of the harmonic component (neglecting higher harmonics)This is given by fig. 4. Analysis of the graph reveals that:
(1)B i 、B o the pole pair number of the harmonic component 1 is also P-2Z. Let Z omega i ＝(P-Z)Ω o Then two component rotational speeds are equal, and mutual coupling can produce invariable electromagnetic torque, and then realize stable variable transmission, and the corresponding stable drive ratio is: g = -omega i /Ω o ＝-(P-Z)/Z；
(2) In the transient operating phase, the driven rotor speed Ω o ≠-Ω i and/G. Driven rotor relative to B i The slip ratio of the harmonic component 2 is not zero, the harmonic component and the first damping winding 2-7 and the first damping winding 2-8 with the number of pole pairs equal to P-Z have relative motion, and asynchronous driving torque acting on a driven rotor is generated, so that the anti-step-out capacity of the magnetic gear can be remarkably improved;
(3) If P, P + Z, P +2Z, P-2Z, 3P-2Z are not equal to P-Z or an odd multiple of P-Z, B is i Harmonic components 1, 3, 4, 5 and B o All harmonic components can not generate induced currents in the I-th damping winding 2-7 and the I-th damping winding 2-8 with the number of pole pairs equal to P-Z, so that the disturbance influence on the asynchronous torque generation in the transient transmission stage and the synchronous torque generation in the steady transmission stage can not be caused; b is i Although the number of pole pairs of the harmonic component 2 is equal to the number of pole pairs of the damping winding set I2-7 and the damping winding set I2-8, the rotating speed of the component is equal to the steady-state rotating speed of the driven rotor of the magnetic gear, so that the harmonic component and the damping winding do not interact to generate induced current in the stable transmission stage of the magnetic gear;
(4) For the anti-step-out stator excitation type field modulation axial magnetic gear (as shown in fig. 2) provided by the embodiment of the invention, the stator permanent magnet 2-1 is clamped between the stator iron core blocks 2-2, and is kept static in the magnetic gear operation stage, the centrifugal force is zero, and the falling risk caused by mechanical force does not exist. The stator permanent magnet 2-1, the I-th damping winding 2-7 and the I-th damping winding 2-8 have no shared space, and the size parameter design of the stator permanent magnet and the I-th damping winding are not influenced mutually.
The present embodiment is a simulation comparison between a common field modulation magnetic gear (as shown in fig. 1) and an anti-step-out stator excitation type field modulation axial magnetic gear (as shown in fig. 2) according to an embodiment of the present invention. The stable transmission ratios of the two magnetic gears are both-5, the load torques are both 15N.m, and the rotating speed of the driving rotor is linearly reduced to-500 r/mi n from 0r/mi n within 0-0.5s and then is kept unchanged.
FIG. 5 shows a simulation curve of the variation of the rotating speed of the driven rotor of the anti-step-out stator excitation type field modulation axial magnetic gear (shown in FIG. 2) and the common field modulation magnetic gear (shown in FIG. 1) under the given working condition; fig. 6 shows the current time-varying simulation curve of the I-th damping winding set 2-7 of the field modulation axial magnetic gear (as shown in fig. 2) of the anti-step-out stator excitation type according to the embodiment of the invention under the given working condition.
As can be seen from fig. 5, under the same given working condition, the driven rotor of the common field modulation magnetic gear (as shown in fig. 1) is out of step, while the driven rotor of the anti-out-of-step stator excitation type field modulation axial magnetic gear (as shown in fig. 2) according to the embodiment of the present invention can keep synchronization, so that it can be seen that the anti-out-of-step stator excitation type field modulation axial magnetic gear provided by the present invention has a stronger anti-out-of-step capability compared with the conventional field modulation magnetic gear.
As can be seen from fig. 6, under a given working condition, the current of the damping winding of the driven rotor of the anti-step-out stator excitation type field modulation axial magnetic gear (as shown in fig. 2) in the steady-state transmission stage is zero, so that no additional influence is caused on the steady-state operation.
Therefore, compared with the prior art, the field modulation magnetic gear provided by the invention can generate induction driving torque by utilizing the interaction of specific harmonic waves of an air gap magnetic field and a damping winding in a transient transmission stage, so that the anti-step-out capability is obviously improved. Meanwhile, the induced current of the damping winding of the magnetic gear is zero in the steady-state operation stage, and the introduced damping winding does not influence the transmission quality of the magnetic gear.
In addition, the field modulation magnetic gear provided by the invention adopts stator excitation to replace traditional rotor excitation, effectively avoids the falling fault of the permanent magnet, solves the problems that the winding and the magnetic steel are mutually restricted in the installation space and mutually interfered in the parameter design, and has the advantages of high mechanical reliability and large design freedom.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. The excitation type field modulation axial magnetic gear of the anti-desynchronization stator is characterized by comprising a stator, a driving rotor and a driven rotor which are coaxially arranged, wherein the driving rotor and the driven rotor are respectively arranged on two sides of the stator.
2. The anti-step-out stator excitation type field modulation axial magnetic gear according to claim 1, wherein the stator comprises stator core segments and stator permanent magnets arranged between the stator core segments, the number of pole pairs of the stator permanent magnets is P, and P is a positive integer.
3. The anti-step-out stator excitation type field modulation axial magnetic gear according to claim 2, wherein the stator core segments both provide clamping protection for the stator permanent magnets and constitute a magnetic medium.
4. The anti-step-out stator excitation type field modulation axial magnetic gear as claimed in claim 1, wherein the driving rotor comprises driving rotor magnetic conduction blocks and driving rotor non-magnetic conduction blocks, the driving rotor magnetic conduction blocks are the same in circumferential width and are non-uniformly and symmetrically distributed along the circumferential direction, and the driving rotor non-magnetic conduction blocks are filled between the driving rotor magnetic conduction blocks.
5. The anti-step-out stator excitation type field modulation axial magnetic gear as claimed in claim 4, wherein the number of the driving rotor magnetic conduction blocks and the number of the driving rotor non-magnetic conduction blocks are both 2Z, Z is a positive integer, and Z < P.
6. The anti-step-out stator excitation type field modulation axial magnetic gear as claimed in claim 1, wherein the driven rotor comprises driven rotor magnetic conduction blocks and driven rotor non-magnetic conduction blocks, the driven rotor magnetic conduction blocks are the same in circumferential width and are uniformly and symmetrically distributed along the circumferential direction, and the driven rotor non-magnetic conduction blocks are filled between the driving rotor magnetic conduction blocks.
7. The anti-step-out stator excitation type field modulation axial magnetic gear of claim 6, wherein the number of the driven rotor magnetic conduction blocks and the driven rotor non-magnetic conduction blocks is 2 (P-Z).
8. The anti-step-out stator excitation type field modulation axial magnetic gear as claimed in claim 6, wherein the inner surface of the driven rotor magnetic conductive block contacting with the air gap is uniformly grooved, and the number of grooves is 4 (P-Z). The I set of damping winding and the II set of damping winding are embedded in the groove.
9. The anti-step-out stator excitation type field modulation axial magnetic gear according to claim 8, wherein the damping windings of the ith set and the damping windings of the ith set are both double-layer pitch windings.
10. The anti-step-out stator excitation type field modulation axial magnetic gear according to claim 8, wherein the number of pole pairs of the damping winding I and the damping winding I is P-Z, and the axes are different from each other by 90 degrees in electrical angle, so that two-phase symmetrical damping windings are formed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116956666A (en) * | 2023-07-11 | 2023-10-27 | 青岛大学 | Axial asymmetric motor iron loss calculation method considering three-dimensional magnetic density distribution |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116956666A (en) * | 2023-07-11 | 2023-10-27 | 青岛大学 | Axial asymmetric motor iron loss calculation method considering three-dimensional magnetic density distribution |
| CN116956666B (en) * | 2023-07-11 | 2024-04-26 | 青岛大学 | Axial asymmetric motor iron loss calculation method considering three-dimensional magnetic density distribution |
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