CN111555493B - Symmetrical rotor structure of double-end axial magnetic circuit hybrid excitation motor - Google Patents
Symmetrical rotor structure of double-end axial magnetic circuit hybrid excitation motor Download PDFInfo
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- CN111555493B CN111555493B CN202010373463.8A CN202010373463A CN111555493B CN 111555493 B CN111555493 B CN 111555493B CN 202010373463 A CN202010373463 A CN 202010373463A CN 111555493 B CN111555493 B CN 111555493B
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- iron core
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/15—Sectional machines
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention provides a symmetrical rotor structure of a double-end axial magnetic circuit hybrid excitation motor, which comprises a rotating shaft, an N-pole outer iron core, an S-pole outer iron core, an N-pole inner iron core, an S-pole inner iron core, a right excitation winding, a right excitation bracket, a left excitation winding and a left excitation bracket, wherein the rotating shaft is connected with the N-pole outer iron core; the rotor structure is centrally symmetrical by taking the center of a rotating shaft as a whole, an N-pole inner iron core and an S-pole inner iron core are symmetrically matched with each other by taking the rotating shaft as the center, an N-pole outer iron core and an S-pole outer iron core are correspondingly arranged outside the N-pole inner iron core and the S-pole inner iron core respectively and are matched with each other to form a cylinder, and a radial magnetic circuit and an axial magnetic circuit of the rotor are formed jointly. The invention realizes the brushless excitation of the hybrid excitation motor, reduces the difficulty of the solid material processing technology, can conveniently process and assemble the motor, and provides possibility for realizing the batch production of the brushless hybrid excitation motor with an axial magnetic circuit.
Description
Technical Field
The invention relates to a symmetrical rotor structure of a double-end axial magnetic circuit hybrid excitation motor and an assembly method thereof, belonging to the technical field of axial magnetic circuit synchronous motors.
Background
The hybrid excitation motor combines the characteristics of high power density of a permanent magnet synchronous motor and adjustable air gap field of an electric excitation motor, adopts a structure with an axial magnetic circuit to realize the brushless performance of the hybrid excitation motor, does not need a rotating rectifier and has high output voltage waveform quality.
The axial hybrid excitation motor among the prior art is of a great variety, if mix excitation claw utmost point synchronous machine, its stator structure is the same with ordinary three-phase alternating current motor, the rotor comprises two claw poles, there is p claw (p is the pole pair number) on every claw pole, two claw poles weld together, one links to each other with the axle, another utmost point palm part has great hole, excitation support one end is fixed on the end cover, the other end stretches into in the claw pole, the claw pole is crisscross to be placed, half clearance packing non-magnetic material is used for the welding, half is used for placing tangential permanent magnet. The structure is adopted to realize brushless operation, has higher power density compared with an electric excitation motor, can generate larger air gap flux density by using smaller excitation current, reduces excitation loss and improves excitation efficiency.
However, in the actual production process, the hybrid excitation motor is difficult to realize engineering assembly, and the main problem is that the rotor structure is very complex: generally, a rotor of a motor has both radial magnetic flux and axial magnetic flux, so that a whole iron core is generally adopted for a rotor iron core, the shape is generally irregular, a large amount of magnetic flux leakage is easily generated, certain difficulty is brought to the processing and assembly of the motor, and the possibility of mass production is limited.
Disclosure of Invention
The invention aims to provide a symmetrical rotor structure of a double-end axial magnetic circuit hybrid excitation motor, aiming at the defects in the prior art, and facilitating the engineered symmetrical assembly of the double-end axial magnetic circuit hybrid excitation motor.
The technical solution of the invention is as follows: the symmetrical rotor structure of the double-end axial magnetic circuit hybrid excitation motor comprises a rotating shaft, an N-pole outer iron core, an S-pole outer iron core, an N-pole inner iron core, an S-pole inner iron core, a right excitation winding, a right excitation bracket, a left excitation winding and a left excitation bracket; the rotor structure is centrally symmetrical by taking the center of a rotating shaft as a whole, an N-pole inner iron core and an S-pole inner iron core are symmetrically matched with each other by taking the rotating shaft as the center, an N-pole outer iron core and an S-pole outer iron core are correspondingly arranged outside the N-pole inner iron core and the S-pole inner iron core respectively and are matched with each other to form a cylinder, and a radial magnetic circuit and an axial magnetic circuit of the rotor are formed jointly.
Furthermore, the inner diameter of the N/S pole outer iron core is the same as the outer diameter of the N/S pole inner iron core, after one end of the N/S pole outer iron core and one end of the N/S pole inner iron core are cut, the positions of the remaining fan-shaped ring cylinders are in a circumferential array, the number and the number of pole pairs are the same, the length of the N/S pole inner iron core is shorter than that of the fan-shaped ring cylinder of the N/S pole outer iron core, and the section of the fixed end at the other end is a conical surface; the fixed end of the N/S pole inner iron core is in a complete circular ring or a sector ring, two sides of the outside of a sector ring cylinder of the N/S pole outer iron core can form a plane through cutting, or an inward-recessed step structure is arranged, and a permanent magnet is installed and fixed; countersunk screw holes are arranged at the corresponding positions of the surfaces of the N/S pole outer iron core and the N/S pole inner iron core, and the countersunk screws penetrate through the countersunk screw holes to be mutually combined into the N/S pole rotor iron core.
Furthermore, a left excitation bracket is arranged at the tail end of the outer side of the N-pole inner iron core, and a left excitation winding is annularly wound inside the left excitation bracket; the tail end of the outer side of the S-pole inner iron core is provided with a right excitation bracket, and a right excitation winding is annularly wound in the right excitation bracket; the sections of the outer opening ends of the left excitation bracket and the right excitation bracket are conical surfaces. An additional air gap exists between the left excitation bracket and the outer ends of the S-pole outer iron core and the N-pole inner iron core, and an additional air gap exists between the right excitation bracket and the outer ends of the N-pole outer iron core and the S-pole inner iron core.
Compared with the prior art, the invention has the following beneficial effects: the invention realizes the brushless excitation of the hybrid excitation motor, reduces the difficulty of the solid material processing technology, can conveniently process and assemble the motor, and provides possibility for realizing the batch production of the brushless hybrid excitation motor with an axial magnetic circuit.
Drawings
FIG. 1 is an exploded view of an assembly structure of a rotor and an excitation bracket of a double-end axial magnetic circuit hybrid excitation motor;
FIG. 2 is a cross-sectional view of an axial magnetic circuit of a double-end hybrid excitation motor;
fig. 3a is a schematic structural view of an outer core of a rotor;
FIG. 3b is a schematic view of the structure of the inner core of the rotor;
FIG. 3c is an assembly view of the inner and outer cores of the rotor;
FIG. 4 is a schematic structural view of an optimized rotor inner core;
FIG. 5 is a structural diagram of a pole-changing arc of an outer core of a rotor;
fig. 6 is a schematic view of the structure of an outer core of a rotor for facilitating the installation of permanent magnets;
FIG. 7 is an assembly view of a rotor core and permanent magnets of one polarity;
fig. 8 is an assembly view of a rotor of a double-ended axial magnetic circuit hybrid excitation motor.
In the figure, 1 is a rotating shaft, 2 is an N-pole outer iron core, 3 is an S-pole outer iron core, 4 is an N-pole inner iron core, 5 is an S-pole inner iron core, 6 is a permanent magnet, 7 is a countersunk screw hole, 8 is a right excitation winding, 9 is a right excitation bracket, 10 is a left excitation winding, 11 is a left excitation bracket, and 12 is an additional air gap.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "central," "longitudinal," "transverse," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and the like indicate orientations or positional relationships based on the orientation or positional relationship shown in the drawings, which are only for convenience of description and simplicity of description, and do not indicate or imply that the referred apparatus or element must have a specific orientation to be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the symmetrical rotor structure of the double-end axial magnetic circuit hybrid excitation motor decomposes two different polarities (N, S poles) into two same structures, and keeps symmetry. The N (or S) pole iron core structure comprises an outer iron core and an inner iron core which jointly form a radial magnetic circuit and an axial magnetic circuit of the rotor. The homopolar outer iron core and inner iron core are connected into a polar rotor iron core by penetrating 3 groups of countersunk screw holes through countersunk screws, permanent magnets are tangentially arranged between an N-pole rotor iron core and an S-pole rotor iron core, the magnetizing direction of the permanent magnets is vertical to the surface of the permanent magnets, the directions of two adjacent tangential permanent magnets are opposite, the N-pole rotor iron core and the S-pole rotor iron core are arranged in a staggered mode, proper intervals are kept in the axial direction, magnetic leakage is reduced, and a rotor structure suitable for a double-end axial magnetic circuit hybrid excitation motor is jointly formed.
Referring to the attached drawing 2, two excitation supports of a left excitation support 11 and a right excitation support 9 are symmetrically arranged at two axial ends of the motor, the left excitation support and the right excitation support are all kept still, an additional air gap 12 exists between the left excitation support and a rotor core, a left excitation winding 10 and a right excitation winding 8 are respectively wound in an annular mode in the corresponding excitation supports, brushless excitation is achieved, a rotary rectifier is not needed, the left excitation support and the right excitation support are identical in structure, and two symmetrical axial excitation paths are respectively formed with the rotor core: starting from the rotor N-pole core, passing through the additional air gap 12, the left (or right) excitation bracket, the additional air gap 12, and finally reaching the rotor S-pole core. The fixed ends of the outer iron core and the fixed ends of the inner iron core of the rotor are both processed into conical surfaces, the open ends of the left excitation support and the right excitation support are also conical surfaces, so that the additional air gaps of the axial excitation magnetic circuit formed by the fixed ends and the left excitation support and the right excitation support are inclined, the excitation magnetic circuit is not easy to saturate by increasing the magnetic conduction area, and the rotor has a wider adjustment range.
Since the N-pole rotor core and the S-pole rotor core have the same and symmetrical structure, the description will be given by taking the N-pole rotor core as an example. Referring to fig. 3a to 3c, the inner core and the outer core of the rotor are both formed by processing annular core materials, the inner diameter of the outer core 2 of the N-pole rotor is the same as the outer diameter of the inner core 4, after one end of the inner core 4 (or the outer core 2) of the N-pole rotor is cut, the remaining sector ring cylinders are arranged in a circumferential array, the number and the number of pole pairs are the same, the length of the inner core 4 is shorter than that of the sector ring cylinder of the outer core 2, and the section of the other end (fixed end) is a conical surface. During assembly, the rotor inner iron core 4 is superposed with one end of the sector surface of the outer iron core 2, the rotor inner iron core 4 at the other end and the fixed end (conical surface) of the rotor outer iron core 2 keep a certain distance, and large magnetic leakage caused by the fact that the distance between the N-pole inner iron core 4 and the S-pole inner iron core 5 is short is avoided during assembly. The N-pole inner iron core 4 and the N-pole outer iron core 2 are connected and combined through a countersunk head screw 7 to form an N-pole rotor iron core.
Referring to fig. 4, the fixed end of the inner core 4 of the N-pole rotor needs to keep a certain distance from both the outer core 3 and the inner core 5 of the S-pole, so that the fixed end can be a complete ring, or a part which is not in direct contact with the inner core 5 of the rotor can be cut to form a fan ring, thereby reducing the magnetic leakage between the rotor cores with different polarities.
Referring to fig. 5, the motor generally requires that the air-gap magnetic field is in sinusoidal distribution, and the no-load voltage is close to a sinusoidal wave, and for the assembly mode of the axial magnetic circuit hybrid excitation motor rotor, if considering to further improve the sine degree of the air-gap magnetic field of the motor, the pole arc coefficient of the motor can be conveniently changed by cutting two sides of the sector ring cylinder of the rotor outer core 2, so that the cogging torque of the motor is weakened, and the sine degree of the air-gap magnetic field can be improved.
Referring to fig. 6, the rotor cores of different polarities (N, S poles) are staggered, and the permanent magnets 6 are tangentially placed between the N-pole core and the S-pole core. In order to fix the permanent magnet 6, two small steps are respectively reserved when the two sides of the sector ring cylinder of the rotor outer iron core 2 are machined, so that the permanent magnet 6 is prevented from moving radially, and meanwhile, one step is respectively reserved at two crossed positions of the two sides of the sector ring cylinder and the fixed end of the outer iron core, so that the permanent magnet 6 is prevented from moving axially.
Referring to fig. 7 and 8, during assembly, the rotor core with one polarity is firstly connected and fixed through a countersunk screw 7, then the permanent magnet 6 is placed, two sides of the permanent magnet 6 are attached to the radial and axial steps, and finally the rotor core with the other polarity is installed, so that the permanent magnet is fixed by the four steps.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A symmetrical rotor structure of a double-end axial magnetic circuit hybrid excitation motor comprises a rotating shaft (1), an N-pole outer iron core (2), an S-pole outer iron core (3), an N-pole inner iron core (4), an S-pole inner iron core (5), a right excitation winding (8), a right excitation bracket (9), a left excitation winding (10) and a left excitation bracket (11); the method is characterized in that: the rotor structure is centrally symmetrical by taking the center of a rotating shaft (1) as a whole, an N-pole inner iron core (4) and an S-pole inner iron core (5) are symmetrically matched with each other by taking the rotating shaft (1) as the center, an N-pole outer iron core (2) and an S-pole outer iron core (3) are respectively and correspondingly arranged outside the N-pole inner iron core (4) and the S-pole inner iron core (5) and are matched with each other to form a cylinder, and a radial magnetic circuit and an axial magnetic circuit of the rotor are jointly formed;
the inner diameter of the N-pole outer iron core (2) is the same as the outer diameter of the N-pole inner iron core (4), after one end of the N-pole outer iron core (2) and one end of the N-pole inner iron core (4) are cut, the positions of the remaining fan-shaped ring cylinders are in a circumferential array, the number of the fan-shaped ring cylinders is the same as the number of pole pairs, the length of the N-pole inner iron core (4) is shorter than that of the fan-shaped ring cylinders of the N-pole outer iron core (2), and the section of the fixed end of the other end of the N-pole inner iron core (4) is a conical surface; the inner diameter of the S-pole outer iron core (3) is the same as the outer diameter of the S-pole inner iron core (5), after one end of the S-pole outer iron core (3) and one end of the S-pole inner iron core (5) are cut, the positions of the remaining fan-shaped ring cylinders are in a circumferential array, the number of the fan-shaped ring cylinders is the same as the number of pole pairs, the length of the S-pole inner iron core (5) is shorter than that of the fan-shaped ring cylinders of the S-pole outer iron core (3), and the section of the fixed end of the other end of the S-pole inner iron core (5) is a conical surface.
2. The symmetrical rotor structure of a double-ended axial magnetic circuit hybrid excitation motor according to claim 1, characterized in that: the tail end of the outer side of the N-pole inner iron core (4) is provided with a left excitation bracket (11), and a left excitation winding (10) is annularly wound in the left excitation bracket (11); the tail end of the outer side of the S-pole inner iron core (5) is provided with a right excitation bracket (9), and a right excitation winding (8) is annularly wound in the right excitation bracket (9).
3. The symmetrical rotor structure of a double-ended axial magnetic circuit hybrid excitation motor according to claim 1, characterized in that: the sections of the outer opening ends of the left excitation bracket (11) and the right excitation bracket (9) are conical surfaces.
4. The symmetrical rotor structure of a double-ended axial magnetic circuit hybrid excitation motor according to claim 1, characterized in that: the fixed end of the N-pole inner iron core (4) or the S-pole inner iron core (5) is in a complete circular ring or a fan ring.
5. The symmetrical rotor structure of a double-ended axial magnetic circuit hybrid excitation motor according to claim 1, characterized in that: and two circumferential sides of the outer part of the sector ring cylinder of the N-pole outer iron core (2) or the S-pole outer iron core (3) are cut to form planes.
6. The symmetrical rotor structure of a double-ended axial magnetic circuit hybrid excitation motor according to claim 1, characterized in that: the corresponding positions of the surfaces of the N-pole outer iron core (2) and the N-pole inner iron core (4) are provided with 1 row of countersunk screw holes (7), and the countersunk screws penetrate through the countersunk screw holes (7) to be mutually combined into an N-pole rotor iron core; the corresponding positions of the surfaces of the S-pole outer iron core (3) and the S-pole inner iron core (5) are also provided with 1 row of countersunk screw holes (7), and the countersunk screws penetrate through the countersunk screw holes (7) to be mutually combined into the S-pole rotor iron core.
7. The symmetrical rotor structure of a double-ended axial magnetic circuit hybrid excitation motor according to claim 1, characterized in that: permanent magnets (6) are tangentially arranged between the side surfaces of the sector ring cylinders, which are matched with the N-pole inner iron core (4) and the S-pole inner iron core (5), respectively.
8. The symmetrical rotor structure of a double-ended axial magnetic circuit hybrid excitation motor according to claim 1, characterized in that: and the side surfaces of the sector ring cylinders of the N-pole outer iron core (2) and the S-pole outer iron core (3) are provided with sunken step structures for installing and fixing the permanent magnet (6).
9. The symmetrical rotor structure of a double-ended axial magnetic circuit hybrid excitation motor according to any one of claims 1 to 8, wherein: an additional air gap (12) is formed between the left excitation bracket (11) and the outer ends of the S-pole outer iron core (3) and the N-pole inner iron core (4), and an additional air gap (12) is formed between the right excitation bracket (9) and the outer ends of the N-pole outer iron core (2) and the S-pole inner iron core (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010373463.8A CN111555493B (en) | 2020-05-06 | 2020-05-06 | Symmetrical rotor structure of double-end axial magnetic circuit hybrid excitation motor |
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| CN202010373463.8A CN111555493B (en) | 2020-05-06 | 2020-05-06 | Symmetrical rotor structure of double-end axial magnetic circuit hybrid excitation motor |
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| CN111555493A CN111555493A (en) | 2020-08-18 |
| CN111555493B true CN111555493B (en) | 2021-08-06 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112910131B (en) * | 2021-01-28 | 2022-09-27 | 南京航空航天大学 | Rotor magnetic pole modulation type bypass type mixed excitation motor |
| CN114844260A (en) * | 2022-05-13 | 2022-08-02 | 浙江吉利控股集团有限公司 | Magnetic field adjustable motor and vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1767316A (en) * | 2005-09-26 | 2006-05-03 | 南京航空航天大学 | Mixed excitation synchronous motor with radial structure |
| CN104104165A (en) * | 2013-04-05 | 2014-10-15 | 瑞美技术有限责任公司 | Rotary electric machine rotor pole configuration |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10361614B2 (en) * | 2015-07-17 | 2019-07-23 | Denso Corporation | AC excitation synchronous rotating electric machine |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1767316A (en) * | 2005-09-26 | 2006-05-03 | 南京航空航天大学 | Mixed excitation synchronous motor with radial structure |
| CN104104165A (en) * | 2013-04-05 | 2014-10-15 | 瑞美技术有限责任公司 | Rotary electric machine rotor pole configuration |
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Effective date of registration: 20230705 Address after: 213000 No. 19 Qianjiatang Road, Yaoguan Town, Wujin District, Changzhou City, Jiangsu Province Patentee after: JIANGSU LEILI MOTOR Co.,Ltd. Address before: No. 29, Qinhuai District, Qinhuai District, Nanjing, Jiangsu Patentee before: Nanjing University of Aeronautics and Astronautics |