CN112953149B - Radial magnetic flux birotor motor - Google Patents
Radial magnetic flux birotor motor Download PDFInfo
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- CN112953149B CN112953149B CN202110206810.2A CN202110206810A CN112953149B CN 112953149 B CN112953149 B CN 112953149B CN 202110206810 A CN202110206810 A CN 202110206810A CN 112953149 B CN112953149 B CN 112953149B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
- H02K1/148—Sectional cores
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/52—Fastening salient pole windings or connections thereto
- H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
- H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention relates to a radial magnetic flux dual-rotor motor which at least comprises a spliced stator, an inner rotor and an outer rotor which are concentrically arranged, wherein the spliced stator at least comprises a plurality of winding splicing blocks which are uniformly arranged along the circumferential direction, a cage-shaped winding support used for supporting the winding splicing blocks and a stator base, the winding splicing blocks at least comprise coils used as current paths and iron cores used as magnetic paths, the iron cores are I-shaped, the cage-shaped winding support at least comprises an inner gear ring and an outer gear ring which are fixedly connected, the winding splicing blocks are inserted into a groove formed by the inner gear ring and the outer gear ring to realize circumferential and radial support, and the stator base is fixedly connected with the cage-shaped winding support in the axial direction and is matched with the cage-shaped winding support to provide axial support and positioning for the winding splicing blocks. Compared with the prior art, the method has the advantages of realizing stable support and positioning of the yoke-free winding splicing block, improving power density and the like.
Description
Technical Field
The invention belongs to the technical field of motor structures, relates to a double-rotor motor, and particularly relates to a radial magnetic flux double-rotor motor.
Background
When the power density of the single-rotor single-stator topological structure motor is improved and meets the bottleneck, the double-rotor motor enters the visual field of people, the yoke part of the stator of the outer rotor motor and the yoke part of the stator of the inner rotor motor are combined together by the traditional radial magnetic flux double-rotor motor, the inner space of the motor is fully utilized, and the torque and the power output capacity of the motor are improved to a certain degree.
However, for the double-rotor motor with the NS magnetic circuit structure, the stator yoke part does not play a good magnetic conduction role, but the weight of the motor is increased to a certain extent, and the power density of the motor is reduced.
The existing stator structure without the yoke part has relatively wide application on an axial magnetic flux permanent magnet motor, and researches show that the stator structure without the yoke part can effectively reduce the weight of the motor and eliminate the iron core loss caused by the yoke part. However, the dual-rotor radial flux stator yoke-free dual-rotor motor has the following difficulties:
1) the yoke part is deleted, the stator becomes an independent split stator unit, and the circumferential, radial and circumferential supporting and mounting positioning of the split stator unit are difficult;
2) under normal working conditions, unbalanced radial magnetic tension can be generated in inner and outer working air gaps of the double-rotor motor, so that the requirement on the strength of the split stator is high;
3) due to the inherent influence on the structure, the magnetic flux generated by the outer rotor permanent magnet is larger than that generated by the inner rotor permanent magnet, and the magnetic leakage at the outer rotor side is increased due to the fact that the inner magnetic flux and the outer magnetic flux are different in size, so that a series of negative effects of aggravation of magnetic saturation, reduction of power density and the like are brought.
The invention discloses an invention patent named as 'a double-rotor motor structure' in Chinese patent with publication number CN111865024A, namely 10 and 30 in 2020. This patent rotor is including the inner circle body, rotor body and the outer circle body that link to each other, sets up inboard magnet and outside magnet on inner circle body and the outer circle body respectively to with rotor structure integrated into one piece, this patent stator adopts no iron core stator, though no iron loss consumes, its structural strength is difficult to satisfy the operating requirement of birotor motor under high temperature environment.
The invention discloses a penetration radial magnetic circuit double-rotor single-stator yoke-free high-torque-density permanent magnet motor, which is a Chinese patent with publication number CN108736676A, published as 11/2/2018. The inner rotor fixing frame is connected with inner rotor magnetic steel through an inner rotor magnetic yoke, the inner side of the machine shell is connected with the outer rotor magnetic steel through an outer rotor magnetic yoke, the stator assembly comprises an iron core fixing frame, a stator fixing frame and the like, a plurality of stator grooves for mounting a stator iron core and water inlet through holes for cooling are formed in the iron core fixing frame, an inner cavity and an outer cavity are integrally formed in the stator fixing frame and are respectively communicated with a water inlet and a water outlet to form a circulating cooling water channel, and the motor has high torque density. However, this patent the inlet openings that the iron core mount was arranged in the stator slot lead to the stator net groove area to reduce, influence effective winding area, and this patent the stator slot that is equipped with on the iron core mount can only provide unilateral support for stator core in the footpath, and its structural strength and stability are all lower moreover.
Therefore, a new stator structure of a dual-rotor motor needs to be designed to support and position the yoke-free winding segments, improve the magnetic circuit of the motor and increase the power density.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and to provide a radial flux dual-rotor motor capable of stably supporting and positioning the yoke-free winding segments and improving the power density.
The purpose of the invention can be realized by the following technical scheme:
a radial magnetic flux dual-rotor motor at least comprises a block type stator, an inner rotor and an outer rotor which are concentrically arranged, main magnetic flux is sequentially linked with the inner rotor, the block type stator and the outer rotor in a turn chain along the radial direction, the block type stator at least comprises a plurality of winding blocks which are uniformly arranged along the circumferential direction, a cage-shaped winding support used for supporting the winding blocks and a stator base, wherein,
the winding splicing block at least comprises a coil serving as a current path and an iron core serving as a magnetic path, the iron core is I-shaped, namely, the inner tooth part and the outer tooth part are provided with tooth tips,
the cage-shaped winding support at least comprises an inner gear ring and an outer gear ring which are fixedly connected, the winding splicing block is inserted into a groove formed by the inner gear ring and the outer gear ring to realize circumferential and radial support,
the stator base is fixedly connected with the cage-shaped winding support in the axial direction and matched with the cage-shaped winding support to provide axial supporting and positioning for the winding splicing blocks.
In a preferred embodiment, the iron core is formed by laminating silicon steel sheets arranged along the axial direction or by casting a soft magnetic material.
Optionally, the soft magnetic material includes an amorphous alloy or the like.
Optionally, the cage-type winding support and the stator frame are axially connected by welding.
In a preferred embodiment, the cage winding support further comprises an end cap axially connecting the inner and outer gear rings, providing axial support to the iron cores of the winding segments.
In a preferred embodiment, the cage winding support further comprises a reinforcing rib connecting the outer ring gear and the inner ring gear.
In a preferred embodiment, the cage winding support is a tailor welded structure or an integrally machined structure.
In a preferred embodiment, the cage winding support is made of a non-magnetically conductive metal material.
Optionally, the non-magnetic conductive metal material includes non-magnetic conductive stainless steel, aluminum alloy, or copper alloy.
In a preferred embodiment, the outer rotor comprises at least an outer rotor yoke having magnetic permeability and a surface-mount permanent magnet attached to an inner surface of the outer rotor yoke.
In a preferred embodiment, the outer rotor yoke is formed by laminating silicon steel sheets arranged in the axial direction, or is integrally formed by processing a soft magnetic material.
In a preferred embodiment, the inner rotor comprises at least an inner rotor yoke having magnetic permeability and a Halbach array permanent magnet attached to an outer surface of the inner rotor yoke.
In a preferred embodiment, the inner rotor yoke is formed by laminating silicon steel sheets arranged in an axial direction, or integrally machining a soft magnetic material.
Optionally, the surface-mounted permanent magnet and the Halbach array permanent magnet are tile-shaped.
Optionally, the surface-mounted permanent magnet is magnetized in a radial direction or a parallel direction.
Optionally, the south pole of the surface-mounted permanent magnet corresponds to the north pole of the Halbach array permanent magnet.
Compared with the prior art, the invention has the following beneficial effects:
1) the block type stator has no stator yoke part, the stator winding block structure is simple, the winding is easy, the winding process of the stator winding is simplified, and the production efficiency is improved;
2) the stator adopts a cage-shaped winding support, so that the supporting problem of the stator without a yoke part of the radial magnetic flux dual-rotor motor is solved, the supporting strength and rigidity of the stator are ensured, and the winding space can be fully utilized;
3) the spliced iron core is matched with the cage-shaped winding support, the magnetic flux conduction function and the structure supporting function are respectively completed by the iron core and the support, and materials with different characteristics are allowed to be adopted, so that the material utilization rate can be more fully improved;
4) the cage-shaped winding support can be integrally formed, and can also be welded after being processed in blocks, so that the structure is simple, the strength is high, and the stability is good;
5) the arrangement of the outer rotor surface-mounted permanent magnets can effectively reduce the thickness of the outer rotor and reduce the overall volume of the motor;
6) the inner rotor permanent magnet adopts a Halbach array structure, which is beneficial to reducing the magnetic flux of the yoke part of the inner rotor and improving the magnetic flux density of the air gap of the inner rotor;
7) the permanent magnets arranged in the inner rotor Halbach array are matched with the outer surface-attached permanent magnets in an arrangement mode, so that continuous magnetic flux of an inner magnetic circuit and an outer magnetic circuit is facilitated, the magnetic flux leakage of the yoke part of the stator is reduced, and the power density of the motor is improved.
Drawings
FIG. 1 is a schematic structural view of a dual-rotor motor according to the present invention;
FIG. 2 is a schematic diagram of a winding segment structure according to the present invention;
FIG. 3 is a schematic view of a cage winding support according to the present invention;
fig. 4 is a schematic view of the stator frame of the present invention, wherein (4a) is a perspective view, (4b) is a side view, and (4c) is a front view;
FIG. 5 is a schematic view of the winding segments supported circumferentially and radially in accordance with the present invention;
FIG. 6 is a schematic view of the axial positioning of the winding segments according to the present invention;
FIG. 7 is a schematic structural view of the outer rotor of the present invention;
FIG. 8 is a schematic view of the inner rotor structure of the present invention;
FIG. 9 is a schematic view of a rotor housing structure according to the present invention, wherein (9a) is a schematic view in one direction and (9b) is a schematic view in another direction;
FIG. 10 is a schematic view of the integrally formed cage-shaped stent of the present invention, wherein (10a) is a schematic view in one direction, and (10b) is a schematic view in another direction;
in the figure: 1-rotor housing, 2-outer rotor, 3-inner rotor, 4-cage winding support, 5-winding split, 6-stator frame, 101-inner side groove, 102-outer side groove, 201-outer rotor yoke, 202-outer rotor boss, 203-surface permanent magnet, 301-inner rotor yoke, 302-Halbach array permanent magnet, 303-inner rotor boss, 401-outer gear ring, 402-inner gear ring, 403-end cap, 404-reinforcing rib, 501-bobbin, 502-iron core, 503-energized winding, 601-outer ring boss, 602-inner ring boss, 603-square hole, 701-first contact surface, 702-second contact surface, 703-third contact surface, 704-fourth contact surface, 801-fifth contact surface, 802-sixth contact surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Example 1
Referring to fig. 1, the present embodiment provides a radial flux dual-rotor motor, which at least includes a block-type stator, an inner rotor 3 and an outer rotor 2 that are concentrically arranged, a main flux is sequentially linked with the inner rotor 3, the block-type stator and the outer rotor 2 in a turn along a radial direction, the block-type stator at least includes a plurality of winding blocks 5 that are uniformly arranged along a circumferential direction, a cage-shaped winding support 4 for supporting the winding blocks 5, and a stator base 6, and the winding blocks 5 are supported in the circumferential direction, the radial direction and the axial direction by the cage-shaped winding support 4 and the stator base 6.
Referring to fig. 2, the winding segment 5 includes an iron core 502, a bobbin 501, and a current-carrying winding 503, the bobbin 501 is mounted on the iron core 502, the current-carrying winding 503 is wound around the iron core 502, the iron core 502 serves as a magnetic circuit, the current-carrying winding 503 includes a coil serving as a current path, and the iron core 502 is i-shaped, that is, both inner and outer teeth have tips. The iron core 5 may be formed by laminating silicon steel sheets arranged along the axial direction, or formed by casting soft magnetic materials such as amorphous alloy. This embodiment has 24 winding segments of the same shape.
Referring to fig. 3, the cage-type winding support 4 includes an inner ring gear 402 and an outer ring gear 401 fixed by welding, and winding segments are inserted into slots formed by the inner ring gear and the outer ring gear to realize circumferential and radial support. The cage winding support 4 can be made of non-magnetic metal materials such as non-magnetic stainless steel, aluminum alloy or copper alloy. In this embodiment, the cage winding support 4 is a tailor welded structure.
The stator base 6 is fixedly connected with the cage-shaped winding support in the axial direction and is matched with the cage-shaped winding support to provide axial supporting and positioning for the winding splicing blocks. Referring to fig. 4, the stator frame 6 includes a square hole 603, an outer ring boss 601, and an inner ring boss 602.
Referring to fig. 5 and 6, in the overall assembly process of the block type stator of this embodiment, the winding blocks 5 are inserted into the slots of the outer ring gear 401 and the inner ring gear 402 in the axial direction, the outer ring gear 401 and the winding block core 502 form a first contact surface 701 in the radial direction, a third contact surface 703 is formed in the circumferential direction, the inner ring gear 402 and the winding block core 502 form a second contact surface 702 in the radial direction, a fourth contact surface 704 is formed in the circumferential direction, the first contact surface 701 and the second contact surface 702 are radial support surfaces of the winding blocks 5, the third contact surface 703 and the fourth contact surface 704 are circumferential support surfaces of the winding blocks 5, 24 winding blocks are sequentially assembled onto the outer ring gear 401 and the inner ring gear 402 in the circumferential direction, and the teeth of the outer ring gear 401 and the teeth of the inner ring gear 402 pass through the square holes 603 in the stator base 6. The cage-type winding support 4 and the stator base 6 are matched with each other, the fifth contact surface 801 of one end surface of the cage-type winding support 4 and the winding splicing block 5 and the sixth contact surface 802 of the other end surface of the stator base 6 and the winding splicing block 5 provide axial positioning for the winding splicing block 5, and the outer gear ring 401 and the inner gear ring 402 are connected in a welding mode to complete the assembly of the splicing block type stator.
In other embodiments, the cage winding support 4 further comprises an end cap 403 axially connecting the inner ring gear 402 and the outer ring gear 401, the inner ring gear 402 and the end cap 403 are connected by welding, and the end cap 403 is mounted at the end of assembling the segmented stator.
Referring to fig. 7, the outer rotor 2 is composed of an outer rotor yoke 201 and a surface-mount permanent magnet 203, wherein the surface-mount permanent magnet 203 is tile-shaped and is adhered to an inner surface of the outer rotor yoke 201 by means of adhesive, and the outer rotor yoke 201 is provided with an outer rotor boss 202. The outer rotor yoke 201 may be formed by laminating silicon steel sheets arranged in the axial direction, or may be formed by integrally processing soft magnetic materials such as amorphous alloy.
Referring to fig. 8, the inner rotor 3 is composed of an inner rotor yoke 301 and a Halbach array permanent magnet 302, wherein the Halbach array permanent magnet 302 is shaped like a tile and is adhered to the outer surface of the inner rotor yoke 301 by gluing, and the inner rotor yoke 301 is provided with an inner rotor boss 303. The inner rotor yoke 301 may be formed by laminating silicon steel sheets arranged in the axial direction, or may be formed by casting soft magnetic materials such as amorphous alloys.
The machine further comprises a rotor housing 1. Referring to fig. 9, the inner sleeve of the rotor housing 1 has a groove 101 on its outer wall for determining the mounting position of the inner rotor by cooperating with the inner rotor boss 303 and transmitting the torque received by the inner rotor to the rotor housing, and the outer sleeve of the rotor housing 1 has a groove 102 on its inner wall for determining the mounting position of the outer rotor by cooperating with the outer rotor boss 202 and transmitting the torque received by the outer rotor to the rotor housing.
Example 2
Referring to fig. 10, a modification of the cage-type winding support of the present invention is different from embodiment 1 in that, in the cage-type winding support 4 of the radial flux dual-rotor motor provided in this embodiment, a reinforcing rib 404 for connecting the inner ring gear and the outer ring gear is added between the outer ring gear 401 and the inner ring gear 402, the reinforcing rib is located in the middle of the teeth of the outer ring gear 401 and the inner ring gear 402, and the inner ring gear and the outer ring gear of the modified cage-type winding support may be integrally formed by a wire cutting process.
The assembly process of this example was identical to example 1.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection determined by the claims.
Claims (10)
1. A radial magnetic flux double-rotor motor at least comprises a block type stator, an inner rotor and an outer rotor which are concentrically arranged, and main magnetic flux is sequentially linked with the inner rotor, the block type stator and the outer rotor in a radial direction,
the block type stator at least comprises a plurality of winding blocks which are uniformly arranged along the circumferential direction, a cage-shaped winding bracket used for supporting the winding blocks and a stator base, wherein,
the winding splicing block at least comprises a coil used as a current path and an iron core used as a magnetic path, the iron core is I-shaped,
the cage-shaped winding support at least comprises an inner gear ring and an outer gear ring which are fixedly connected, the winding splicing block is inserted into a groove formed by the inner gear ring and the outer gear ring to realize circumferential and radial support,
the stator base is fixedly connected with the cage-shaped winding support in the axial direction and matched with the cage-shaped winding support to provide axial supporting and positioning for the winding splicing blocks.
2. The radial flux dual rotor electric machine of claim 1, wherein the core is formed by laminating silicon steel sheets arranged in an axial direction or by casting a soft magnetic material.
3. The radial flux dual rotor electric machine of claim 1, wherein the cage winding support further comprises an end cap axially connecting the inner and outer ring gears.
4. The radial flux dual rotor electric machine of claim 1, wherein the cage winding support further comprises ribs connecting the outer ring gear and the inner ring gear.
5. The radial flux dual rotor electric machine of claim 1, wherein the cage winding support is a tailor welded or integrally formed structure.
6. The radial flux dual rotor electric machine of claim 1, wherein the cage winding support is made of a non-magnetically permeable metal material.
7. The dual-rotor radial flux motor as claimed in claim 1, wherein the outer rotor includes at least an outer rotor yoke having magnetic permeability and a surface-mounted permanent magnet attached to an inner surface of the outer rotor yoke.
8. The radial-flux dual-rotor motor according to claim 7, wherein the outer rotor yoke is formed by laminating silicon steel sheets arranged in the axial direction or integrally processing a soft magnetic material.
9. The radial flux dual rotor electric machine of claim 1, wherein the inner rotor includes at least an inner rotor yoke having magnetic permeability and a Halbach array permanent magnet affixed to an outer surface of the inner rotor yoke.
10. The radial-flux dual-rotor motor according to claim 9, wherein the inner rotor yoke is formed by laminating silicon steel sheets arranged in the axial direction or integrally machining a soft magnetic material.
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| CN202110206810.2A CN112953149B (en) | 2021-02-24 | 2021-02-24 | Radial magnetic flux birotor motor |
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| CN113241865B (en) * | 2021-06-16 | 2022-03-01 | 常州神力电机股份有限公司 | Piece together block formula iron core subassembly of new forms of energy hybrid motor |
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