CN111010008B - Surface-mounted permanent magnet rotor disc of high-strength axial magnetic field motor - Google Patents
Surface-mounted permanent magnet rotor disc of high-strength axial magnetic field motor Download PDFInfo
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- CN111010008B CN111010008B CN201911286316.0A CN201911286316A CN111010008B CN 111010008 B CN111010008 B CN 111010008B CN 201911286316 A CN201911286316 A CN 201911286316A CN 111010008 B CN111010008 B CN 111010008B
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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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a surface-mounted permanent magnet rotor disc of a high-strength axial magnetic field motor, which comprises two rotor discs symmetrically arranged on a rotating shaft in an opposite mode, wherein a space is reserved between the two rotor discs for mounting a stator disc; each rotor disc comprises a high polymer material spoke-shaped permanent magnet pressing plate, a trapezoidal permanent magnet, a high polymer material fixing frame, a rotor magnetic back yoke, a rotor supporting plate and a carbon fiber sheath which are sequentially arranged; the rotor magnetic back yoke is arranged on the back of the high polymer material fixing frame, and a trapezoidal groove is arranged between the inner ring and the outer ring of the high polymer material fixing frame; trapezoidal permanent magnets are alternately arranged in the circumferential direction of the rotor magnetic conduction back yoke, stepped openings are formed in two sides of the front face of each trapezoidal permanent magnet, and the trapezoidal permanent magnets are connected with the high polymer material fixing frame through high polymer material spoke-shaped permanent magnet pressing plates; a carbon fiber protective ring sleeve is arranged outside the high polymer material fixing frame; and a rotor supporting plate is arranged on the outer side of the rotor magnetic conduction back yoke. The invention has the advantages of small loss of the rotor, high structural strength and good installation manufacturability.
Description
Technical Field
The invention relates to the technical field of axial flux permanent magnet motors, in particular to a surface-mounted permanent magnet rotor disc of a high-strength axial magnetic field motor.
Background
Compared with the traditional radial magnetic field permanent magnet motor, the axial magnetic field permanent magnet motor has the remarkable advantages of compact structure, high torque density, high efficiency and the like, and the axial magnetic field permanent magnet motor has various topological structures, wherein a single-stator double-rotor structure and a single-rotor double-stator structure are common. The axial magnetic field permanent magnet motor has a direct proportional relationship between the torque and three times of the outer diameter, so that the torque density has a remarkable advantage under the structural constraint of a long diameter and a small diameter, and the axial magnetic field permanent magnet motor has a good application prospect in occasions such as electric vehicles, wind power generation, aircraft propulsion systems and the like. Different from a radial motor, the outer diameter of a rotor of an axial magnetic field motor is generally the same as that of a stator, so that the outer diameter of the rotor is larger, the moment of inertia is large, and a permanent magnet is generally in a surface-mounted structure. Axial field permanent magnet motors are developing towards high speed and high power density, and therefore higher requirements are put on the structural strength of a disc rotor with large inertia. For a high-power axial magnetic field, the outer diameter of the axial magnetic field is generally larger, and particularly, the rotor strength and the protection of the permanent magnet under high-speed operation become an important technical difficulty. Because the rotor of the axial magnetic field permanent magnet motor is generally in a surface-mounted structure, under the working condition of high power and high speed, the permanent magnet not only needs to bear larger centrifugal force but also needs to bear the electromagnetic attraction of the stator, and particularly under the condition that the stator and the rotor are eccentric, the unbalanced attraction of the permanent magnet becomes larger, and the permanent magnet is tested for installation, fixation and protection.
Patent CN 101860098A discloses a disk permanent magnet motor rotor, which adopts a press block and a screw to fix a permanent magnet on a motor metal magnetic baffle plate, so that the permanent magnet is tightly connected with the motor metal magnetic baffle plate. The rotor of the ultra-high-speed disc type permanent magnet synchronous motor disclosed in patent CN 108233656A adopts a U-shaped protective sleeve to fixedly install a permanent magnet, an axial air gap is increased, and the selection of materials is particularly critical, generally, the rotor needs to have the characteristic of non-magnetic and non-conductive properties, and meanwhile, the mechanical strength is good, so that a plurality of technical problems are brought to engineering design.
Disclosure of Invention
The invention aims to provide a surface-mounted permanent magnet rotor disc of a high-strength axial magnetic field motor, which has the advantages of small rotor loss, high structural strength and good installation manufacturability.
The technical solution for realizing the purpose of the invention is as follows: a surface-mounted permanent magnet rotor disc of a high-strength axial magnetic field motor comprises two rotor discs which are symmetrically arranged on a rotating shaft in an opposite mode, and a space is reserved between the two rotor discs and used for mounting a stator disc; each rotor disc comprises a high polymer material spoke-shaped permanent magnet pressing plate, a trapezoidal permanent magnet, a high polymer material fixing frame, a rotor magnetic back yoke, a rotor supporting plate and a carbon fiber sheath which are sequentially arranged;
the rotor magnetic back yoke is arranged on the back of the high polymer material fixing frame, spokes are arranged between the inner ring and the outer ring of the high polymer material fixing frame to form a trapezoidal groove, and the trapezoidal permanent magnets are alternately and uniformly arranged on the rotor magnetic back yoke in the circumferential direction according to different N and S pole magnetizing directions; step openings are formed in two sides of the front face of the trapezoidal permanent magnet, the height of each step opening is equal to the thickness of the polymer material spoke-shaped permanent magnet pressing plate, and the polymer material spoke-shaped permanent magnet pressing plate is combined with the polymer material fixing frame, so that the trapezoidal permanent magnet is kept fixed in the radial direction and the axial direction; carbon fibers are wound on the outer side of the high polymer material fixing frame along the circumferential direction to form a carbon fiber protection ring sleeve; and a rotor supporting plate is arranged on the outer side of the rotor magnetic back yoke, a rotor disc on one side is formed and is arranged on the rotating shaft, and the position of the rotor disc in the axial direction is fixed through a lock nut.
As a specific example, the trapezoid permanent magnet is in an isosceles trapezoid shape, the upper and lower bottom edges of the trapezoid are both arc shapes, the arc length is determined according to the pole arc of the motor, and the arc diameters of the upper and lower bottom edges are respectively the same as the inner and outer diameters of the stator; step openings are formed in the two waist sides of the trapezoidal permanent magnet, and the thickness of each step opening is not more than one half of the total thickness of the trapezoidal permanent magnet; the thickness of the high polymer material spoke-shaped permanent magnet pressing plate is the same as the depth of a step notch of the trapezoidal permanent magnet, and the width of the step notch is smaller than one fifth of the thickness of the trapezoidal permanent magnet.
As a specific example, the rotor magnetic back yoke is mounted on the rotor support plate, and the connection mode is screw connection or structural adhesive bonding; the rotor magnetic back yoke is formed by winding electric pure iron and silicon steel sheets or is formed by die-casting a soft magnetic composite material; one side surface of the rotor magnetic back yoke facing the rotor supporting plate is subjected to special-shaped treatment according to the saturation condition of a magnetic circuit and the design requirement of a light-weight structure; the diameters of the inner circle and the outer circle of the rotor magnetic conduction back yoke are respectively the same as the diameters of the circles corresponding to the two arc edges of the upper bottom and the lower bottom of the trapezoidal permanent magnet.
As a specific example, the rotor support plate is mounted on a rotating shaft; the rotor supporting plate is made of high-strength aviation aluminum alloy or high-molecular composite materials and is used for supporting the rotor electromagnetic component.
As a specific example, the polymer material fixing frame is in a ring shape, and has an inner ring and an outer ring, spokes are arranged between the inner ring and the outer ring, the number of the spokes is the same as the number of the rotor poles, and the spokes are uniformly distributed in the circumferential direction, the width of each spoke is the same as the distance between two adjacent trapezoidal permanent magnet poles, the thickness of the inner ring and the spokes is the same as the local thickness of the permanent magnet with step notches on both sides, and the thickness of the outer ring is the same as the sum of the thickness of the permanent magnet, the thickness of the rotor magnetic back yoke and the thickness of the rotor supporting plate.
As a specific example, the spoke-shaped permanent magnet pressing plate made of the polymer material comprises an inner ring, spokes identical to the polymer material fixing frame are arranged in the outer diameter direction of the inner ring, the length of each spoke extends to the outer circle of the polymer material fixing frame, and the thickness of each spoke is identical to the thickness of a step gap on two sides of the trapezoidal permanent magnet; the width of the spoke of the polymer material spoke-shaped permanent magnet pressing plate is a step opening which can completely press the trapezoidal permanent magnet after being installed on the polymer material fixed frame.
Compared with the prior art, the invention has the following remarkable advantages:
(1) the permanent magnet is effectively protected in the axial direction and the radial direction, and the structural safety problem of the permanent magnet when the disc type motor rotor runs at a high speed is solved;
(2) the main structural components are made of polymer composite materials, so that the loss of the rotor is reduced, the temperature rise of the rotor is reduced, and the high-speed operation safety is improved;
(3) the fixing frame made of the high polymer material is adopted for protecting the permanent magnet, and the carbon fiber is used for reinforcing the outer ring, so that the components are easily and conveniently transferred and assembled structurally, and the manufacturing cost of the rotor is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a high-strength surface-mounted permanent magnet disc type motor double rotor disc of the present invention.
Fig. 2 is a schematic structural diagram of permanent magnet block segmentation and magnetization direction and a formed permanent magnet disc in the present invention, wherein (a) is a schematic structural diagram of permanent magnet block segmentation and magnetization direction, and (b) is a schematic structural diagram of a permanent magnet disc.
Fig. 3 is a structural schematic diagram of a rotor magnetic back yoke in the invention.
Fig. 4 is a schematic diagram of the front and back side structures of the rotor magnetic back yoke module of the present invention, wherein (a) is a schematic diagram of the front side structure and (b) is a schematic diagram of the back side structure.
FIG. 5 is a schematic structural diagram of a fixing frame made of polymer material according to the present invention.
Fig. 6 is a three-dimensional side view of the rotor magnetic back yoke and the polymer material fixing frame of the present invention.
FIG. 7 is a schematic structural diagram of a polymer material foxy-strip-shaped permanent magnet pressing plate according to the present invention.
FIG. 8 is a front side view of a rotor formed by pressing a polymer material strip-shaped permanent magnet pressing plate into permanent magnets.
FIG. 9 is a schematic structural view of a carbon fiber protective ring formed by winding carbon fibers around a polymer material fixing frame according to the present invention.
Fig. 10 is a schematic view showing a structure of a rotor supporting plate in the present invention.
Fig. 11 is a schematic structural view of a complete single rotor disk formed by installation in accordance with the present invention.
Fig. 12 is a schematic structural view of the rotating shaft of the present invention.
Fig. 13 is a schematic view of a double rotor disk assembly and a complete rotor formed on a rotating shaft according to the present invention.
In the figure:
the rotor comprises a rotor disc 1, a rotating shaft 2, a spoke-shaped permanent magnet pressing plate 3 made of high polymer materials, a trapezoid permanent magnet 4, a high polymer material fixing frame 5, a rotor magnetic conduction back yoke 6, a rotor supporting plate 7, a carbon fiber sheath 8 and a lock nut 9.
Detailed Description
For the axial magnetic field permanent magnet motor, the structural strength of the rotor directly influences the highest rotating speed and power density of the type, and with the continuous development of the axial magnetic field motor technology, the protection of the permanent magnet and the improvement of the rotor strength become important research hotspots and directions in the field.
The invention provides a surface-mounted permanent magnet rotor disc of a high-strength axial magnetic field motor, which comprises two rotor discs 1, wherein the two rotor discs 1 are symmetrically arranged on a rotating shaft 2 in a surface-to-surface mode, and a space is reserved between the two rotor discs 1 for mounting a stator disc; each rotor disc 1 comprises a high polymer material spoke-shaped permanent magnet pressing plate 3, a trapezoidal permanent magnet 4, a high polymer material fixing frame 5, a rotor magnetic conduction back yoke 6, a rotor supporting plate 7 and a carbon fiber sheath 8 which are sequentially arranged;
the rotor magnetic back yoke 6 is arranged on the back of the high polymer material fixing frame 5, spokes are arranged between the inner ring and the outer ring of the high polymer material fixing frame 5 to form a trapezoidal groove, and the trapezoidal permanent magnets 4 are alternately and uniformly arranged on the rotor magnetic back yoke 6 in the circumferential direction according to different N and S pole magnetizing directions; step openings are formed in two sides of the front face of the trapezoidal permanent magnet 4, the height of each step opening is the same as the thickness of the polymer material spoke-shaped permanent magnet pressing plate 3, and the polymer material spoke-shaped permanent magnet pressing plate 3 is combined with the polymer material fixing frame 5, so that the trapezoidal permanent magnet 4 is kept fixed in the radial direction and the axial direction; carbon fibers are wound on the outer side of the high polymer material fixing frame 5 along the circumferential direction to form a carbon fiber protection ring sleeve 8; and a rotor support plate 7 is arranged on the outer side of the rotor magnetic back yoke 6, forms a rotor disc 1 on one side and is arranged on the rotating shaft 2, and the position of the rotor disc 1 in the axial direction is fixed through a lock nut 9.
Furthermore, the trapezoid permanent magnet 4 is in an isosceles trapezoid shape, the upper and lower bottom edges of the trapezoid are both arc-shaped, the arc length is determined according to the pole arc of the motor, and the arc diameters of the upper and lower bottom edges are respectively the same as the inner and outer diameters of the stator; step openings are formed in the two waist sides of the trapezoidal permanent magnet 4, and the thickness of each step opening is not more than one half of the total thickness of the trapezoidal permanent magnet 4; the thickness of the high polymer material spoke-shaped permanent magnet pressing plate 3 is the same as the depth of a step opening of the trapezoidal permanent magnet 4, and the width of the step opening is smaller than one fifth of the thickness of the trapezoidal permanent magnet 4.
Further, the rotor magnetic back yoke 6 is mounted on the rotor support plate 7 in a screw connection mode or a structural adhesive bonding mode; the rotor magnetic back yoke 6 is formed by winding electrical pure iron and silicon steel sheets or is formed by die-casting a soft magnetic composite material; one side surface of the rotor magnetic back yoke 6 facing the rotor supporting plate 7 is subjected to special-shaped treatment according to the saturation condition of a magnetic circuit and the design requirement of a light-weight structure; the diameters of the inner circle and the outer circle of the rotor magnetic conduction back yoke 6 are respectively the same as the diameters of the circles corresponding to the two arc edges of the upper bottom and the lower bottom of the trapezoidal permanent magnet 4.
Further, the rotor supporting plate 7 is mounted on the rotating shaft 2; the rotor supporting plate 7 is made of high-strength aviation aluminum alloy or high-molecular composite materials and is used for supporting the rotor electromagnetic component.
Furthermore, the high polymer material fixing frame 5 is in a ring shape and is provided with an inner ring and an outer ring, spokes are arranged between the inner ring and the outer ring, the number of the spokes is the same as the number of poles of the rotor and are uniformly distributed in the circumferential direction, the width of each spoke is the same as the distance between 4 poles of two adjacent trapezoidal permanent magnets, the thickness of the inner ring and the spokes is the same as the local thickness of stepped notches on two sides of each permanent magnet, and the thickness of the outer ring is the same as the sum of the thickness of each permanent magnet, the thickness of the rotor magnetic back yoke 6 and the thickness of the rotor supporting plate 7.
Further, the polymer material spoke-shaped permanent magnet pressing plate 3 comprises an inner ring, spokes which are the same as the polymer material fixing frame 5 are arranged in the outer diameter direction of the inner ring, the length of each spoke extends to the outer circle of the polymer material fixing frame 5, and the thickness of each spoke is the same as that of a step opening on two sides of the trapezoidal permanent magnet 4; the width of the spoke of the polymer material spoke-shaped permanent magnet pressing plate 3 is a step opening which can completely press the trapezoidal permanent magnet 4 after being installed on the polymer material fixed frame 5.
The invention is described in further detail below with reference to the figures and specific examples.
With reference to fig. 1, the high-strength surface-mounted permanent magnet disc type motor double rotor disc of the present invention includes a rotating shaft 2, a lock nut 9 and two rotor discs 1; the rotor disc 1 comprises a high polymer material spoke-shaped permanent magnet pressing plate 3, a trapezoidal permanent magnet 4, a high polymer material fixing frame 5, a rotor magnetic conduction back yoke 6, a rotor supporting plate 7 and a carbon fiber sheath 8 which are sequentially arranged;
the two rotor disks 1 are symmetrically arranged on the rotating shaft 2, and a space is reserved between the two rotor disks for mounting the stator disks; the rotor magnetic back yoke 6 is arranged on the back of the high polymer material fixing frame 5, spokes are arranged between the inner ring and the outer ring of the high polymer material fixing frame 5 to form a trapezoidal groove, and the trapezoidal permanent magnets 4 are alternately and uniformly arranged on the rotor magnetic back yoke 6 in the circumferential direction according to different N and S pole magnetizing directions; step openings are formed in two sides of the front face of the trapezoidal permanent magnet 4, the height of each step opening is the same as the thickness of the polymer material spoke-shaped permanent magnet pressing plate 3, and the polymer material spoke-shaped permanent magnet pressing plate 3 is combined with the polymer material fixing frame 5, so that the trapezoidal permanent magnet 4 is kept fixed in the radial direction and the axial direction; the high polymer material fixing frame 5 is wound with carbon fibers to form a carbon fiber protection ring sleeve 8; and a rotor supporting plate 7 is arranged on the outer side of the rotor magnetic back yoke 6 to form a rotor disc 1 on one side, the rotor disc 1 is arranged on the rotating shaft 2, and the position of the rotor disc 1 in the axial direction is fixed through a lock nut 9.
The double rotor disc structure of the surface-mounted permanent magnet disc type motor shown in fig. 1 is a 5-pole rotor, the trapezoidal permanent magnets 4 on each rotor disc 1 are alternately arranged according to N, S poles in the circumferential direction, wherein the trapezoidal permanent magnets 4 on each pole are divided into a plurality of sections in the radial direction to suppress eddy current loss of the trapezoidal permanent magnets 4, as shown in fig. 2(a) - (b), the trapezoidal permanent magnets 4 on each pole are divided into 4 sections, and the magnetizing directions of the trapezoidal permanent magnets 4 under each pole are completely the same. In addition, in order to further enhance the fixing and installation of the trapezoidal permanent magnet 4 on the structure, stepped notches are formed in two sides of one side, facing the air gap, of the trapezoidal permanent magnet 4, the height of the stepped notches in the two sides of the trapezoidal permanent magnet 4 is half of the thickness of the trapezoidal permanent magnet 4, and the thickness of the stepped notches is one fifth of the thickness of the trapezoidal permanent magnet 4.
As shown in fig. 3, the magnetic back yoke 6 on one rotor disc 1 is formed by die-casting a soft magnetic composite material, the magnetic back yoke 6 is divided into 10 blocks along the circumferential direction, the whole magnetic back yoke 6 disc is formed by splicing 10 divided magnetic back yokes 6, and each magnetic back yoke 6 is perforated for facilitating the later structural fixation, as shown in fig. 4(a) - (b), a schematic front-back view of a single magnetic back yoke 6 is given. Because the 10 trapezoidal permanent magnets 4 are installed by aligning with the spliced central line of the magnetic conduction blocks, according to the magnetic flux density saturation degree on the magnetic field conduction path and the magnetic conduction back yoke 6, the radian is arranged on one side, facing the rotor supporting plate 7, of each magnetic conduction back yoke 6, the middle of each magnetic conduction back yoke is thick, and the two sides of each magnetic conduction back yoke are thin, so that the magnetic conduction back yoke 6 corresponding to the middle line of each trapezoidal permanent magnet 4 is thin after the trapezoidal permanent magnets 4 are installed, the magnetic conduction back yoke 6 between the two poles of each trapezoidal permanent magnet 4 is thick, and the weight of the rotor can be reduced under the condition that the magnetic flux path is not influenced.
As shown in fig. 5, a schematic structural diagram of the fixing frame 5 made of the polymer material is shown, the inner ring and the outer ring are connected by spokes, and the number of the spokes is 10 as the same as that of the rotor poles; the axial width of the outer ring is the sum of the thickness of the trapezoidal permanent magnet 4, the thickness of the excircle of the magnetic conductive back yoke 6 and the thickness of the rotor support plate 7, and the spoke arrangement needs to ensure that the surface of the rotor magnetic conductive back yoke 6 facing the trapezoidal permanent magnet 4 is just completely removed, and the thickness of the spoke is consistent with the thickness of the stepped notch removed from the two sides of the trapezoidal permanent magnet 4, so that 10 trapezoidal block-shaped shallow grooves can be formed after the magnetic conductive back yoke 6 is combined with the high polymer material fixing frame 5, and the shape of the shallow grooves completely corresponds to that of the trapezoidal permanent magnet 4 of each pole; the thickness of the inner ring of the high polymer material fixing frame 5 is the same as that of the spokes and is kept level; holes are formed in the side, close to the outer ring, of each spoke and correspond to the holes in the magnetic conductive back yoke 6 one by one, and therefore screws can be conveniently and fixedly installed; the lower part of the inner ring corresponding to each spoke is also provided with a screw hole so as to be convenient for the fixed installation of the spoke-shaped permanent magnet pressing plate 3 made of high polymer material.
As shown in fig. 6, which is a schematic structural diagram of the magnetic back yoke 6 and the polymer material fixing frame 5 after being combined, the trapezoidal permanent magnet 4 is sequentially installed in 10 trapezoidal block-shaped shallow grooves formed along the circumferential direction according to the N, S pole direction, wherein the contact surface between the trapezoidal permanent magnet 4 and the magnetic back yoke 6 is coated with structural adhesive to improve the bonding strength between the two. As shown in fig. 7, the polymer spoke-shaped permanent magnet pressing plate 3 includes an inner ring, spokes identical to the polymer material fixing frame 5 are arranged in the outer diameter direction of the inner ring, the length of the spokes extends to the outer circle of the polymer material fixing frame 5, and the thickness of the spokes is identical to the thickness of stepped notches on two sides of the trapezoidal permanent magnet 4; the width of the spoke of the polymer material spoke-shaped permanent magnet pressing plate 3 is a step opening which can completely press the trapezoidal permanent magnet 4 after being installed on the polymer material fixed frame 5. Holes are formed in the side, close to the outer ring, of each spoke and correspond to the holes in the spokes of the magnetic conductive back yoke 6 and the high polymer material fixing frame 5 one by one, and therefore fixing and installation of screws are facilitated; the inner ring of the spoke-shaped permanent magnet pressing plate 3 made of the high polymer material is also provided with screw holes corresponding to the positions of the holes on the inner ring of the fixing frame 5 made of the high polymer material. The spoke-like permanent magnet rotor pressing plate 3 made of the polymer material is mounted to form a rotor structure as shown in fig. 8.
The carbon fiber protective sleeve 8 shown in fig. 9 is formed by winding carbon fiber around the polymer material fixing frame 5. Fig. 10 is a schematic structural diagram of the rotor supporting plate 7, which is generally made of a lightweight and high-strength metal material, and a surface of the rotor supporting plate facing the rotor is the same as a back surface of the magnetic back yoke 6, so as to be in complete contact with the magnetic back yoke 6 and the rotor supporting plate 7, and the structural adhesive is used to enhance the bonding strength, and a threaded hole is drilled at a position corresponding to the hole on the magnetic back yoke 6.
As shown in fig. 11, for the structural schematic of the installation of the formed rotor disc 1, the close connection of the parts is finally fixed by screws.
As shown in fig. 12, which is a schematic structural diagram of the rotating shaft 2, two rotor disks 1 that are manufactured are mounted on the rotating shaft 2, and thus a complete high-strength surface-mounted permanent magnet disk motor dual rotor can be formed, as shown in fig. 13, the rotor disks 1 and the rotating shaft 2 adopt a key groove connection mode, and are locked by a locking nut 9 in order to prevent the rotor from moving axially.
According to the surface-mounted permanent magnet rotor disc of the high-strength axial magnetic field motor, the permanent magnet is effectively protected in the axial direction and the radial direction, and the problem of structural safety of the permanent magnet when the rotor of the disc motor runs at high speed is solved; the main structural components are made of polymer composite materials, so that the loss of the rotor is reduced, the temperature rise of the rotor is reduced, and the high-speed operation safety is improved; the fixing frame made of the high polymer material is adopted for protecting the permanent magnet, and the carbon fiber is used for reinforcing the outer ring, so that the components are easily and conveniently transferred and assembled structurally, and the manufacturing cost of the rotor is reduced.
Claims (6)
1. A surface-mounted permanent magnet rotor disc of a high-strength axial magnetic field motor is characterized by comprising two rotor discs (1) which are symmetrically arranged on a rotating shaft (2) in a surface-to-surface mode, and a space is reserved between the two rotor discs (1) and used for mounting a stator disc; each rotor disc (1) comprises a high polymer material spoke-shaped permanent magnet pressing plate (3), a trapezoidal permanent magnet (4), a high polymer material fixing frame (5), a rotor magnetic conduction back yoke (6), a rotor supporting plate (7) and a carbon fiber sheath (8) which are sequentially arranged;
the rotor magnetic back yoke (6) is arranged on the back of the high polymer material fixing frame (5), spokes are arranged between the inner ring and the outer ring of the high polymer material fixing frame (5) to form a trapezoidal groove, and the trapezoidal permanent magnets (4) are alternately and uniformly arranged on the rotor magnetic back yoke (6) in the circumferential direction according to different N and S pole magnetizing directions; step openings are formed in two sides of the front face of the trapezoidal permanent magnet (4), the height of each step opening is the same as the thickness of the polymer material spoke-shaped permanent magnet pressing plate (3), and the trapezoidal permanent magnet (4) is kept fixed in the radial direction and the axial direction through the combination of the polymer material spoke-shaped permanent magnet pressing plate (3) and the polymer material fixing frame (5); carbon fibers are wound on the radial outer side of the high polymer material fixing frame (5) along the circumferential direction to form a carbon fiber protection ring sleeve (8); and a rotor support plate (7) is arranged on the axial outer side of the rotor magnetic back yoke (6), a rotor disc (1) on one side is formed and is arranged on the rotating shaft (2), and the position of the rotor disc (1) in the axial direction is fixed through a lock nut (9).
2. The surface-mounted permanent magnet rotor disc of the high-strength axial magnetic field motor according to claim 1, wherein the trapezoid permanent magnet (4) is in an isosceles trapezoid shape, the upper bottom edge and the lower bottom edge of the trapezoid are both in arc shapes, the arc lengths are determined according to the polar arc of the motor, and the arc diameters of the upper bottom edge and the lower bottom edge are respectively the same as the inner diameter and the outer diameter of the stator; step openings are formed in the two waist sides of the trapezoidal permanent magnet (4), and the height of each step opening is not more than one half of the total thickness of the trapezoidal permanent magnet (4); the thickness of the high polymer material spoke-shaped permanent magnet pressing plate (3) is the same as the height of a step opening of the trapezoidal permanent magnet (4), and the width of the step opening is smaller than one fifth of the thickness of the trapezoidal permanent magnet (4).
3. The surface-mounted permanent magnet rotor disc of a high-strength axial magnetic field motor according to claim 2, wherein the rotor magnetic back yoke (6) is mounted on the rotor support plate (7) in a manner of screw connection or structural adhesive bonding; the rotor magnetic back yoke (6) is formed by winding an electrical pure iron and a silicon steel sheet or is formed by die-casting a soft magnetic composite material; one side surface of the rotor magnetic back yoke (6) facing the rotor supporting plate (7) is subjected to special-shaped treatment according to the saturation condition of a magnetic circuit and the design requirement of a light-weight structure; the diameters of the inner circle and the outer circle of the rotor magnetic conduction back yoke (6) are respectively the same as the diameters of the circles corresponding to the two arc edges of the upper bottom and the lower bottom of the trapezoidal permanent magnet (4).
4. The surface-mounted permanent magnet rotor disc of a high-strength axial magnetic field motor according to claim 1, wherein the rotor support plate (7) is mounted on the rotating shaft (2); the rotor supporting plate (7) is made of high-strength aviation aluminum alloy or high-molecular composite materials and is used for supporting the rotor electromagnetic component.
5. The surface-mounted permanent magnet rotor disc of the high-strength axial magnetic field motor according to claim 1, wherein the high polymer material fixing frame (5) is in a ring shape and is provided with an inner ring and an outer ring, spokes are arranged between the inner ring and the outer ring, the number of the spokes is the same as the number of rotor poles and are uniformly distributed in the circumferential direction, the width of each spoke is the same as the distance between two adjacent trapezoidal permanent magnets (4), the thickness of the inner ring and the spokes is the same as the local thickness of stepped notches at two sides of the permanent magnets, and the thickness of the outer ring is the same as the sum of the thickness of the permanent magnets, the thickness of the rotor magnetic back yoke (6) and the thickness of the rotor supporting plate (7).
6. The surface-mounted permanent magnet rotor disc of the high-strength axial magnetic field motor according to claim 1, wherein the spoke-shaped permanent magnet pressing plate (3) made of the high polymer material comprises an inner ring, spokes identical to the high polymer material fixing frame (5) are arranged in the outer diameter direction of the inner ring, the lengths of the spokes extend to the outer circle of the high polymer material fixing frame (5), and the thicknesses of the spokes are identical to the thicknesses of stepped notches on two sides of the trapezoidal permanent magnet (4); the width of the spoke of the high polymer material spoke-shaped permanent magnet pressing plate (3) is a step opening which can completely press the trapezoidal permanent magnet (4) after being installed on the high polymer material fixed frame (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911286316.0A CN111010008B (en) | 2019-12-13 | 2019-12-13 | Surface-mounted permanent magnet rotor disc of high-strength axial magnetic field motor |
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| CN201911286316.0A CN111010008B (en) | 2019-12-13 | 2019-12-13 | Surface-mounted permanent magnet rotor disc of high-strength axial magnetic field motor |
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| CN111010008B true CN111010008B (en) | 2020-11-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11811268B2 (en) | 2021-04-06 | 2023-11-07 | Hamilton Sundstrand Corporation | Aircraft electric motor |
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