阅读说明：本技术 模块化双定子开关磁阻直线电机 (Modular double-stator switch reluctance linear motor ) 是由 邓召学 张洒洒 李旭 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种模块化双定子开关磁阻直线电机,包括从内至外依次同轴设置的内定子单元、动子单元和外定子单元,动子单元与外定子单元之间以及动子单元与内定子单元之间具有设定间隙。该结构在有限的空间内设置外定子单元和内定子单元,通过双定子单元与动子单元相互作用,可通过改变绕组电流的大小以及换相次序来满足所要求的性能,实现外定子单元和内定子单元作用在动子单元上推力的波峰、波谷之间的互补,达到在获取大推力密度的同时减小推力波动的目的。(The invention discloses a modular double-stator switched reluctance linear motor which comprises an inner stator unit, a rotor unit and an outer stator unit which are coaxially arranged from inside to outside in sequence, wherein set gaps are formed between the rotor unit and the outer stator unit and between the rotor unit and the inner stator unit. The structure is provided with the outer stator unit and the inner stator unit in a limited space, the required performance can be met by changing the magnitude of winding current and the phase change sequence through the interaction of the double stator units and the rotor unit, the complementation between the wave crest and the wave trough of the thrust acted on the rotor unit by the outer stator unit and the inner stator unit is realized, and the purpose of reducing the thrust fluctuation while acquiring high thrust density is achieved.)

1. The utility model provides a two stator switched reluctance linear electric motors of modularization which characterized in that: the stator comprises an inner stator unit, a rotor unit and an outer stator unit which are coaxially arranged from inside to outside in sequence, and set gaps are arranged between the rotor unit and the outer stator unit and between the rotor unit and the inner stator unit.

2. The modular dual stator switched reluctance linear motor of claim 1, wherein: the inner wall of the outer stator unit and the outer wall of the inner stator unit are respectively provided with a stator outer salient pole and a stator inner salient pole, and the inner wall and the outer wall of the rotor unit are respectively provided with a rotor inner salient pole which is opposite to the stator inner salient pole in the radial direction and a rotor outer salient pole which is opposite to the stator outer salient pole in the radial direction.

3. The modular dual stator switched reluctance linear motor of claim 1, wherein: the stator unit comprises an inner sleeve, an outer sleeve, an upper supporting part and a lower supporting part, wherein the inner sleeve and the outer sleeve are coaxially arranged, the upper supporting part and the lower supporting part are fixed at two ends of the outer sleeve, the inner stator unit is fixedly sleeved on the inner sleeve, the outer stator unit is fixedly sleeved on the outer sleeve, and the upper end and the lower end of the rotor unit are respectively in axial sliding fit with the upper supporting part and the lower supporting part.

4. The modular dual stator switched reluctance linear motor of claim 2, wherein: the rotor unit comprises an inner rotor, an outer rotor and a magnetic isolation material, wherein the inner rotor and the outer rotor are sleeved with each other, and the magnetic isolation material is filled between the inner rotor and the outer rotor.

5. The modular dual stator switched reluctance linear motor of claim 3, wherein: the upper supporting part comprises an upper supporting cover connected to the upper end of the rotor unit and covering the upper end of the inner stator unit, an upper end cover covering the upper end of the outer sleeve and a supporting shaft connected to the upper supporting cover and axially matched with the upper end cover in a sealing and sliding manner.

6. The modular dual stator switched reluctance linear motor of claim 3, wherein: the lower supporting part comprises a lower supporting sleeve connected to the lower end of the rotor unit, and an inner sliding sleeve and an outer sliding sleeve which are coaxially arranged at the lower end of the outer sleeve, and an annular sliding groove in axial sliding fit with the lower end of the lower supporting sleeve is formed between the inner sliding sleeve and the outer sliding sleeve.

Technical Field

The invention belongs to the technical field of motors, and particularly relates to a modular double-stator switched reluctance linear motor.

Background

The permanent magnet linear motor is a motor type which is widely applied in the field of industrial linear driving, further development of the permanent magnet linear motor is limited due to the problems of high cost, irreversible demagnetization and the like of the permanent magnet linear motor, and the switched reluctance linear motor is expected to become a substitute motor of the permanent magnet linear motor due to the advantages of simple structure and no need of a permanent magnet. However, the switched reluctance linear motor generally has the defects of large thrust fluctuation, small thrust density and the like, so that the problem of small thrust density and the like of the switched reluctance linear motor is solved, and the switched reluctance linear motor is an urgent need for promoting the development of the switched reluctance linear motor.

Disclosure of Invention

In view of this, the present invention provides a modular dual-stator switched reluctance linear motor, which improves thrust density of the linear motor by a structure in which dual stators are matched with a single rotor.

The invention discloses a modular double-stator switched reluctance linear motor which comprises an inner stator unit, a rotor unit and an outer stator unit which are coaxially arranged from inside to outside in sequence, wherein set gaps are formed between the rotor unit and the outer stator unit and between the rotor unit and the inner stator unit.

Furthermore, the inner wall of the outer stator unit and the outer wall of the inner stator unit are respectively provided with a stator outer salient pole and a stator inner salient pole, and the inner wall and the outer wall of the rotor unit are respectively provided with a rotor inner salient pole which is radially opposite to the stator inner salient pole and a rotor outer salient pole which is radially opposite to the stator outer salient pole.

The stator unit comprises an inner sleeve, an outer sleeve, an upper supporting part and a lower supporting part, wherein the inner sleeve and the outer sleeve are coaxially arranged, the upper supporting part and the lower supporting part are fixed at two ends of the outer sleeve, the inner stator unit is fixedly sleeved on the inner sleeve, the outer stator unit is fixedly sleeved on the outer sleeve, and the upper end and the lower end of the rotor unit are respectively in axial sliding fit with the upper supporting part and the lower supporting part.

Further, the rotor unit comprises an inner rotor and an outer rotor which are sleeved with each other and a magnetic isolation material filled between the inner rotor and the outer rotor.

Furthermore, the upper supporting part comprises an upper supporting cover connected to the upper end of the rotor unit and covering the upper end of the inner stator unit, an upper end cover covering the upper end of the outer sleeve and a supporting shaft connected to the upper supporting cover and axially matched with the upper end cover in a sealing and sliding manner.

Further, the lower supporting part comprises a lower supporting sleeve connected to the lower end of the rotor unit, and an inner sliding sleeve and an outer sliding sleeve which are coaxially arranged at the lower end of the outer sleeve, and an annular sliding groove which is in axial sliding fit with the lower end of the lower supporting sleeve is formed between the inner sliding sleeve and the outer sliding sleeve.

The invention has the beneficial effects that:

according to the invention, through the interaction of the double stator units and the rotor unit, the required performance can be met by changing the magnitude of the winding current and the phase change sequence, the complementation between the wave crest and the wave trough of the thrust acted on the rotor unit by the outer stator unit and the inner stator unit is realized, and the purpose of reducing the thrust fluctuation while acquiring high thrust density is achieved; compared with the traditional linear motor, the linear motor has the advantages of high thrust density, small thrust fluctuation and the like, has short-time braking capacity, and can meet the multi-working-condition use requirements of the motor.

Drawings

The invention is further described below with reference to the figures and examples.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic diagram of a structure of an outer stator unit, an inner stator unit and a rotor unit;

FIG. 3 is a schematic structural view of an outer stator module;

FIG. 4 is a schematic structural diagram of an inner stator module;

FIG. 5 is a schematic structural view of an upper support cover;

FIG. 6 is a schematic view of a lower support cover;

FIG. 7 is a schematic view of a magnetic flux circuit;

Detailed Description

As shown in the figure: the modular double-stator switched reluctance linear motor of the embodiment comprises an inner stator unit 20, a rotor unit 30 and an outer stator unit 10 which are annular and coaxially arranged from inside to outside, and set gaps are formed between the rotor unit and the outer stator unit and between the rotor unit and the inner stator unit. Because the motor belongs to a switched reluctance linear motor, the interaction among the outer stator unit, the inner stator unit and the rotor unit is based on the current excitation applied by the winding and generates the required thrust according to the 'minimum reluctance principle';

in this embodiment, the inner wall of the outer stator unit 10 and the outer wall of the inner stator unit 20 are respectively provided with a stator outer salient pole 11 and a stator inner salient pole 21, and the inner wall and the outer wall of the mover unit 30 are respectively provided with a mover inner salient pole 31 radially opposite to the stator inner salient pole and a mover outer salient pole 32 radially opposite to the stator outer salient pole. The radial relative arrangement refers to that when the rotor unit is driven to move linearly, the salient poles on the corresponding rotor unit and the salient poles on the stator unit are axially dislocated;

the stator outer salient pole and the stator inner salient pole comprise salient pole bodies and winding coils wound on the salient pole bodies, which is the prior art and is not described in detail; the outer wall of the inner stator unit 20 is a cylindrical surface where the radial outer end surface of the stator inner salient pole 21 is located, the inner wall of the outer stator unit 10 is a cylindrical surface where the radial inner end surface of the stator outer salient pole 11 is located, the inner wall of the rotor unit 30 is a cylindrical surface where the radial inner end surface of the rotor inner salient pole 31 is located, the outer wall of the rotor unit 30 is a cylindrical surface where the radial outer end surface of the rotor outer salient pole 32 is located, the set gap is an air gap of the linear motor, and is between 0.5 mm and 2mm, preferably, the gap is 1mm in the embodiment;

in this embodiment, the salient poles are arranged in the prior art, the winding coil is an alternating current excitation winding coil, the winding adopts a lap winding wire embedding manner, and the winding coil also adopts the prior art, which is not described herein again; referring to fig. 7, the mover inner salient poles 31 and the mover outer salient poles 32 are arranged in a radial direction and are arranged back to apply current excitation to the winding coils on the corresponding salient poles, and according to the minimum reluctance principle, the magnetic flux generated by the outer stator salient poles forms a short magnetic flux loop along the motor air gap, the mover outer salient poles and the mover tooth yoke, and the magnetic flux generated by the inner stator salient poles forms a short magnetic flux loop along the motor air gap, the mover inner salient poles and the mover tooth yoke, thereby generating double thrust required by the motor; the rotor unit of the switched reluctance linear motor adopts an inner-side salient pole structure and an outer-side salient pole structure, the rotor unit 30, the outer stator unit 10 and the inner stator unit 20 have double functions, and the working mode can fully realize independent and controllable thrust of the linear motor and generate composite thrust.

In this embodiment, the stator further comprises an inner sleeve 40 and an outer sleeve 50 coaxially arranged, and an upper supporting portion 60 and a lower supporting portion 70 fixed to two ends of the outer sleeve, wherein the inner stator unit is fixedly sleeved on the inner sleeve, the outer stator unit is fixedly sleeved on the outer sleeve, and the upper end and the lower end of the rotor unit are respectively in axial sliding fit with the upper supporting portion and the lower supporting portion. As shown in fig. 1, the inner sleeve 40 is interference-fitted with the inner stator unit 20, and the outer sleeve 50 is interference-fitted with the outer stator unit 10; in addition, the upper and lower supports 60 and 70 facilitate the mounting of the mover unit 30 and position the mover unit 30 opposite to the outer stator unit 10 and the inner stator unit 20; the structure is beneficial to packaging the outer stator unit 10, the inner stator unit 20 and the rotor unit 30, and the integration level of each component is improved;

in this embodiment, the mover unit 30 is formed by inserting an inner mover 30a and an outer mover 30b, and a magnetic insulating material is filled between an outer wall of the inner mover 30a and an inner wall of the outer mover 30 b.

As shown in FIG. 1, an outer mover 30b is sleeved on the inner mover 30a, mover inner salient poles 31 are disposed on an inner wall of the inner mover 30, and mover outer salient poles 32 are disposed on an outer wall of the outer mover 30 b; the magnetic isolation material is made of iron-nickel alloy or other known magnetic isolation materials, the magnetic isolation material can be set into a thin-wall cylindrical structure to be isolated between the inner rotor and the outer rotor, and mutual interference between magnetic fluxes generated by winding coils on the inner stator unit and the outer stator unit is inhibited through the magnetic isolation material;

in this embodiment, the upper supporting portion 60 includes an upper supporting cover 61, a supporting shaft 62 and an upper end cover 63, the upper end cover 63 covers the upper end of the outer sleeve 50, the upper supporting cover 61 is connected to the upper end of the mover unit 30 and covers the upper end of the inner stator unit 20, the supporting shaft is connected to the upper supporting cover, and the supporting shaft upwards penetrates through the inner circle of the upper end cover to the outside of the outer sleeve and axially slides and fits with the inner circle of the upper end cover.

As shown in fig. 1, the support shaft serves as both the support structure of the inner stator unit 20 and the output shaft for linear power output, and a connection flange is integrally formed on the support shaft and fixedly connected to the upper support cover 61 through bolts; the support shaft is axially matched with the inner circle of the upper end cover in a sliding way through a first linear bearing 91, the support shaft is sealed with the inner circle of the upper end cover through a sealing ring 64, and the sealing ring is sealed at the axial outer side of the first linear bearing 91;

referring to fig. 1 and 5, the upper support cover has a cross-sectional structure with a shape like a Chinese character 'ji' along an axial section, and a flanged position at a lower end of the upper support cover can be connected with an upper end of the rotor unit 30 by a bolt connection or a clamping connection, as shown in fig. 5, an annular clamping groove 65 is arranged at the flanged position of the upper support cover in the embodiment, and is clamped with a clamping block at the upper end of the rotor unit 30, so that the upper support cover 61 and the rotor unit 30 are axially connected and fixed; the axial height of the inner cavity of the upper support cover 61 defines a stopping point for the axial downward sliding of the mover unit 30, and the height dimension of the inner cavity of the upper support cover 61 can be correspondingly set according to the sliding stroke of the mover unit 30;

in this embodiment, the lower support portion 70 includes a lower support sleeve 71, an inner sliding sleeve 72, an outer sliding sleeve 73 and a lower end cover 74, the lower end cover covers the lower end of the outer sleeve 50, the lower support sleeve 71 is connected to the lower end of the mover unit 30, the inner sliding sleeve 72 and the outer sliding sleeve 73 are coaxially fixed to the upper end surface of the lower end cover, an annular sliding groove is formed between the outer wall of the inner sliding sleeve 72 and the inner wall of the outer sliding sleeve 73, and the lower end of the lower support sleeve 71 extends into the sliding groove and is axially slidably fitted with the sliding groove.

Referring to fig. 1, a cross section of the lower support sleeve 71 cut along an axial direction thereof is "L" shaped, as shown in fig. 6, in this embodiment, an annular groove is also formed at a position of a flange at an upper end of the lower support sleeve 71, and the annular groove is clamped with a clamping block at a lower end of the mover unit 30; the inner wall of the lower support sleeve 71 is in axial sliding fit with the outer wall of the inner sliding sleeve 72 through a second linear bearing 92, the outer wall of the lower support sleeve 71 is in axial sliding fit with the inner wall of the outer sliding sleeve 73 through a third linear bearing 93, the inner sliding sleeve 72 and the outer sliding sleeve 73 are fixed on a lower end cover 74 through bolts, and the lower end cover 74 is fixed on the lower end portion of the outer sleeve 50 through bolts.

In this embodiment, the outer stator unit 10 is formed by axially splicing a plurality of annular outer stator modules, a plurality of sets of stator outer salient poles are arranged on the inner surface of each outer stator module along the circumferential direction, the inner stator unit 20 is formed by axially splicing a plurality of annular inner stator modules, and a plurality of sets of stator inner salient poles are arranged on the outer surface of each inner stator module along the circumferential direction.

The inner stator module and the outer stator module are both formed by stamping and clamping silicon steel sheets; as shown in fig. 3, the two axial ends of the outer stator modules are respectively provided with a semi-annular clamping portion, the two circumferential ends of each clamping portion are respectively provided with a right-angled trapezoidal groove 12, when two axially adjacent outer stator modules are spliced, the two butted clamping portions are axially spliced to form a complete circular ring structure, and at the splicing surfaces of the two clamping portions, the two corresponding right-angled trapezoidal grooves are spliced to form a closed clamping groove which is formed by two symmetrical right-angled trapezoidal grooves, and a clamping block is clamped into the clamping groove in a shape-fitting manner, so that the clamping connection of the adjacent outer stator modules is completed; as shown in fig. 4, the clamping structure of the adjacent inner stator module is similar to the clamping structure of the adjacent outer stator module, and is not described herein again;

the inner stator unit and the outer stator unit are both composed of a plurality of modules, and the number of the stator modules can be variably adjusted according to the performance requirement by the movement space of the motor; as shown in fig. 2 and fig. 3, six sets of stator external salient poles are circumferentially arranged on the inner wall of a single external stator module, two stator external salient poles are axially arranged in each set, stator external winding coils are arranged on the stator external salient poles to apply current excitation to the two salient pole windings in the axial direction, the two stator external salient poles in the axial direction of the single external stator module form a phase, the generated magnetic flux forms a short magnetic flux loop along the air gap of the motor, the rotor external salient pole 32 and the rotor tooth yoke in a closed manner, and the external stator unit is assembled on the inner wall of the outer sleeve in an interference fit manner;

the inner stator unit is composed of a plurality of inner stator modules and inner stator winding coils, six groups of inner stator salient poles are arranged on the inner wall of each inner stator module along the circumferential direction, two inner stator salient poles are axially arranged in each group, the inner stator winding coils are arranged on the inner stator salient poles to apply current excitation to the two inner stator winding coils along the axial direction, the two inner stator salient poles of each inner stator module along the axial direction form a phase, the generated magnetic flux forms a short magnetic flux loop along the air gap of the motor, the inner rotor salient poles 31 and the rotor tooth yoke in a closed mode, and the inner stator unit is fixedly assembled on the outer wall of the inner sleeve 40 in an interference fit mode.

In this embodiment, the inner wall of the outer sleeve 50 is connected with an upper positioning block 81, the upper positioning block 81 is of a circular ring structure, the outer diameter of the upper positioning block 81 is the same as the inner diameter of the outer sleeve 50, the structure of the upper positioning block 81 is substantially the same as that of the outer sliding sleeve 73, the upper positioning block is fixed on the upper end cover 63 through a bolt, the outer sliding sleeve 73 is fixedly connected with the lower end cover 74 through a bolt, and the lower end of the upper positioning block 81 and the upper end of the outer sliding sleeve 73 respectively abut against two axial ends of the outer stator unit 10, so as to axially position the outer stator unit 10.

In this embodiment, the buffer block 82 may be made of rubber, the buffer block 82 is fixed to the upper end of the inner sleeve 40 and pressed on the axial upper end of the inner stator unit 20, the inner sliding sleeve 72 is fixedly connected to the lower end cover 74 through a bolt, and the axial lower end of the stator unit 20 abuts against the upper end of the inner sliding sleeve 72, so as to axially position the inner stator unit 20, wherein the buffer block 82 also has a buffering function.

In this embodiment, the lower end of the support shaft 62 passes through the inner sleeve 40 and extends downward to the outside of the outer sleeve, and the two ends of the support shaft extend to the outside of the outer sleeve to form two output ends. The support shaft is made of non-magnetocaloric treatment reinforced aluminum alloy, a fourth linear bearing 94 is arranged between the position of the inner wall of the inner sleeve 40 close to the lower end and the support shaft, and a fifth linear bearing 95 is arranged between the position of the inner wall of the inner sleeve 40 close to the upper end and the support shaft.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.