CN112134381A - Built-in magnetic steel composite pole rotor for axial flux permanent magnet motor - Google Patents
Built-in magnetic steel composite pole rotor for axial flux permanent magnet motor Download PDFInfo
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- CN112134381A CN112134381A CN202010836066.XA CN202010836066A CN112134381A CN 112134381 A CN112134381 A CN 112134381A CN 202010836066 A CN202010836066 A CN 202010836066A CN 112134381 A CN112134381 A CN 112134381A
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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
- H02K1/2793—Rotors axially facing stators
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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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- 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
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/12—Transversal flux machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
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- Y02T10/64—Electric machine technologies in electromobility
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Abstract
A built-in magnetic steel composite pole rotor for an axial flux permanent magnet motor comprises a rotor disc, a composite ferromagnetic pole, a magnetic pole frame, a composite permanent magnet, an outer pressure ring and an inner pressure ring; 1) the motor with the built-in magnetic steel composite pole rotor improves the running performance and reliability of the motor. 2) Compared with the traditional surface-mounted axial flux motor rotor, the internal magnetic steel composite pole rotor saves the permanent magnet consumption by 10-20%. 3) The rotor with the built-in magnetic steel composite poles uses a plurality of standard rectangular permanent magnets to simulate the fan-shaped permanent magnet of the traditional axial flux motor, so that the cost of the permanent magnet is reduced. 4) The ferromagnetic pole can be formed by punching a rectangular groove on a silicon steel sheet and winding, so that the processing difficulty and the processing time of the fan-shaped groove rotor are greatly reduced, and the manufacturing cost of the motor is reduced. 5) The built-in magnetic steel composite pole rotor has no special-shaped parts, less processing amount, simple assembly and low manufacturing cost, and the manufacturing cost is close to or even lower than that of a surface-mounted rotor (used for an axial flux motor).
Description
Technical Field
The invention belongs to the technical field of axial flux permanent magnet motors, and particularly relates to a rotor structure and a fixing method of an axial flux permanent magnet motor with built-in magnetic steel.
Background art:
in an axial flux permanent magnet motor, a permanent magnet surface-mounted rotor structure is the most common and is relatively easy to realize structurally, but the axial flux permanent magnet motor has some problems: 1) the special-shaped permanent magnet (fan-shaped and provided with an assembly spigot, such as a patent application No. CN 201920168805.5 and a patent application No. CN 201822097957.9) has high cost; 2) the processing difficulty of the special-shaped rotor core or the rotor bracket (such as a patent application No. CN 201822097957.9 and a patent application No. CN 201710985414.8) is high; 3) the larger electromagnetic air gap reduces the alternating-axis inductance and the direct-axis inductance of the motor, increases the leakage inductance of the motor, has low magnetic field utilization rate and poor capability of inhibiting harmonic current. The rotor of the axial magnetic motor with the built-in magnetic steel can greatly reduce the electromagnetic air gap of the motor, improve the alternating-axis and direct-axis inductance of the motor and inhibit the current harmonic. However, in the axial flux permanent magnet motor, it is difficult to machine slots incorporating magnetic poles, more specifically, fan-shaped slots, in the wound rotor core, and therefore, a rotor structure incorporating magnetic steel is less likely to be employed in the axial flux motor.
For example, an axial flux motor rotor with embedded magnetic poles is proposed in a patent (application number CN201611161975.8), which is mostly in the aspect of electromagnetic structure, but does not mention a mechanical structure and a mounting and fixing method. The patent (application number CN201810319634.1) mentions an electromagnetic mechanism of a magnetism-gathering axial flux motor rotor, mainly explains the electromagnetic structure of the rotor, the outer layer of the rotor adopts tangential magnetizing magnetic steel, and an iron core is clamped between the two pieces of magnetic steel, but does not mention an engineering facility method.
Therefore, designing a rotor for a built-in magnetic steel axial flux motor, which is easy to implement in engineering and has low manufacturing cost, and further improving the inductance and the flux weakening capability of the axial flux permanent magnet motor is a problem to be solved by those skilled in the art at present.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a structure of an axial flux motor rotor with built-in magnetic steel, which aims to solve the problems in the prior art, reduce the manufacturing cost of an axial flux permanent magnet motor, improve the inductance of the axial flux permanent magnet motor, improve the flux weakening capability of the motor and improve the running performance of the motor.
The technical scheme is as follows: the invention is realized by the following technical scheme:
a built-in magnetic steel composite pole rotor for an axial flux permanent magnet motor is characterized by comprising a rotor disc (1), a composite ferromagnetic pole (2), a magnetic pole frame (3), a composite permanent magnet (4), an outer pressure ring (5) and an inner pressure ring (6);
the composite ferromagnetic pole (2) is formed by splicing a plurality of ferromagnetic pole subunits, the magnetic pole frame (3) penetrates into a T-shaped groove (204) of the composite ferromagnetic pole (2), the composite permanent magnet (4) is formed by combining and splicing a plurality of subunits, and the number of subunits forming the composite ferromagnetic pole (2) is the same as that of the subunits forming the composite permanent magnet (4); the composite permanent magnet (4) is arranged in a permanent magnet groove (8) between the adjacent composite ferromagnetic poles (2), and the permanent magnet groove (8) is a step-shaped groove formed by a plurality of rectangular grooves with different widths and equal heights; the composite permanent magnet (4) is in a structure which is adaptive to the shape of the permanent magnet groove (8).
The magnetic pole frame (3) comprises a frame body (301) and frame claws (302), the frame claws (302) are uniformly arranged along the outer circumference of the annular frame body (301), the length direction of the frame claws (302) is consistent with the radial direction of the annular frame body (301), the number of the frame claws (302) is consistent with the number of poles of a designed motor and is also consistent with the number of the composite ferromagnetic poles (2) and the composite permanent magnets (4); the magnetic pole frame (3) is formed by punching two pieces of non-magnetic stainless steel plates into a magnetic pole upper frame (304) and a magnetic pole lower frame (305) which are connected into a whole; the upper magnetic pole frame (304) is arranged on the lower magnetic pole frame (305) to form a T-shaped structure matched with the T-shaped groove (204).
The thickness of the magnetic pole frame (3) is less than or equal to 5mm, the sum of the thicknesses of the magnetic pole upper frame (304) and the magnetic pole lower frame (305) is less than or equal to 5mm, and the thicknesses of the magnetic pole upper frame and the magnetic pole lower frame are selected according to design requirements.
The composite ferromagnetic pole (2) consists of a ferromagnetic pole A (201), a ferromagnetic pole B (202) and a ferromagnetic pole C (203) subunit, the inner diameter and the outer diameter of the three subunits are different, a T-shaped groove (204) is formed in the bottom of the axial side of the composite ferromagnetic pole (2), a pole shoulder (205) extending towards the permanent magnet groove (8) is arranged at the top of the axial side of the composite ferromagnetic pole (2), the T-shaped groove (204) is of a structure for accommodating a frame claw (302) of the magnetic pole frame (3), and the pole shoulder (205) is of a structure for axially limiting and accommodating the composite permanent magnet (4) in the permanent magnet groove (8);
the side walls of the ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) form a stepped structure matched with the side wall of the composite permanent magnet (4), and the tops of the ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are spliced together to form a fan-shaped structure.
The composite permanent magnet (4) is composed of rectangular permanent magnets A (401), rectangular permanent magnets B (402) and rectangular permanent magnets C (403) subunits, the heights of the permanent magnet subunits are the same, and the widths of the permanent magnet subunits are sequentially decreased from outside to inside, so that the permanent magnets A (401), the permanent magnets B (402) and the permanent magnets C (403) are combined together to form the stepped quasi-sector composite permanent magnet.
The outer ring (5) is provided with a claw pressing groove (501), the claw pressing groove (501) is a structure which can just contain and press the end part of the frame claw (302), and the outer ring (5) is made of a non-magnetic light material.
The ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are all structures which are wound into a wound iron core (2010) by non-oriented silicon steel sheet punching grooves and are prepared by the following method: a closing groove (20101) and a T-shaped groove (204) are formed in the wound iron core (2010), and a polar surface rib (20102) and a polar bottom rib (20103) are arranged on the closing groove (20101) close to the upper bottom surface and the lower bottom surface; adhesive is coated between silicon steel sheets of the wound iron core (2010); removing partial pole gluten (20102) from wound cores (2010) with different diameters, and removing all pole bottom gluten (20103) to obtain a ferromagnetic pole A (201), a ferromagnetic pole B (202) and a ferromagnetic pole C (203).
Magnetic lines (F) emitted by passing through the adjacent composite permanent magnets (4) penetrate into the composite ferromagnetic poles (2), and finally penetrate out along the surfaces of the adjacent composite ferromagnetic poles (2) to form N, S poles which are alternately distributed.
The rotor disc (1), the magnetic pole frame (3), the outer pressure ring (5) and the inner pressure ring (6) are all made of non-magnetic plates.
The advantages and effects are as follows:
the invention has the following specific advantages:
1) compared with the traditional surface-mounted magnetic steel axial magnetic motor, the motor with the built-in magnetic steel composite pole rotor has the advantages that the alternating-axis inductance and the direct-axis inductance are improved by about 1.5 times, part of higher current harmonics output by the converter is absorbed, and the running performance and the reliability of the motor are improved.
2) Compared with the traditional surface-mounted axial flux motor rotor, the internal magnetic steel composite pole rotor saves the use amount of permanent magnets by 10-20%.
3) The rotor with the built-in magnetic steel composite poles uses a plurality of standard rectangular permanent magnets to simulate the fan-shaped permanent magnet of the traditional axial flux motor, so that the cost of the permanent magnet is reduced.
4) The ferromagnetic pole can be formed by punching a rectangular groove on a silicon steel sheet and winding, so that the processing difficulty and the processing time of the fan-shaped groove rotor are greatly reduced, and the manufacturing cost of the motor is reduced.
5) The built-in magnetic steel composite pole rotor has no special-shaped parts, less processing amount, simple assembly and low manufacturing cost, and the manufacturing cost is close to or even lower than that of a surface-mounted rotor (used for an axial flux motor).
Description of the drawings:
FIG. 1 is a structural view of a built-in magnetic steel composite pole rotor of the present invention;
FIG. 2 is an exploded view of the built-in magnet steel composite pole rotor of the present invention;
FIG. 3 is a view of the turntable of the present invention;
FIG. 4 is a composite ferromagnetic pole figure of the present invention;
FIG. 5 is a view of a pole piece of the present invention;
FIG. 6 is a diagram of a composite permanent magnet of the present invention;
FIG. 7 is a diagram of the outer ring of the present invention;
FIG. 8 is a view of a wound core of the present invention;
FIG. 9 is a ferromagnetic pole pattern of the present invention with portions of the pole gluten and all of the pole bottom gluten removed;
FIG. 10 is an assembly view of a pole carrier, a composite ferromagnetic pole and a composite permanent magnet of the present invention;
description of reference numerals:
1. a rotor disk; 2. a composite ferromagnetic pole; 3. a magnetic pole frame; 4. a composite permanent magnet; 5. an outer pressure ring; 6. an inner compression ring; 7. fixing nails; 8. a permanent magnet slot; 101. a disk fixing hole; 201. a ferromagnetic pole A; 202. a ferromagnetic pole B; 203. a ferromagnetic pole C; a "T" shaped slot; 205. a pole shoulder; 301. a frame body; 302. a frame claw; 303. a rack fixing hole; 304. mounting a magnetic pole; 305. a magnetic pole lower frame; 401. a permanent magnet A; 402. a permanent magnet B; 403. a permanent magnet C; 501. a claw pressing groove; 502. an outer ring locking hole; 2010. winding the iron core; 20101. a closed slot; 20102. gluten with extremely high quality; 20103. and (5) a polar bottom rib.
The arrow A in the figure indicates the magnetizing direction; arrow B indicates the axial direction; arrow C indicates the radial direction; e represents the side of the rectangular groove; f represents a magnetic line.
The specific implementation mode is as follows: the invention is further described below with reference to the accompanying drawings:
a built-in magnetic steel composite pole rotor for an axial flux permanent magnet motor comprises a rotor disc (1), a composite ferromagnetic pole (2), a magnetic pole frame (3), a composite permanent magnet (4), an outer pressure ring (5) and an inner pressure ring (6);
the composite ferromagnetic pole (2) is formed by splicing a plurality of ferromagnetic pole subunits, the magnetic pole frame (3) penetrates into a T-shaped groove (204) of the composite ferromagnetic pole (2), the composite permanent magnet (4) is formed by combining and splicing a plurality of subunits, and the number of subunits forming the composite ferromagnetic pole (2) is the same as that of the subunits forming the composite permanent magnet (4); the composite permanent magnet (4) is arranged in a permanent magnet groove (8) between the adjacent composite ferromagnetic poles (2), and the permanent magnet groove (8) is a step-shaped groove formed by a plurality of rectangular grooves with different widths and equal heights; the composite permanent magnet (4) is in a structure which is adaptive to the shape of the permanent magnet groove (8).
The magnetic pole frame (3) comprises a frame body (301) and frame claws (302), the frame claws (302) are uniformly arranged along the outer circumference of the annular frame body (301), the length direction of the frame claws (302) is consistent with the radial direction of the annular frame body (301), the number of the frame claws (302) is consistent with the number of poles of a designed motor and is also consistent with the number of the composite ferromagnetic poles (2) and the composite permanent magnets (4); the magnetic pole frame (3) is formed by punching two pieces of non-magnetic stainless steel plates into a magnetic pole upper frame (304) and a magnetic pole lower frame (305) which are connected into a whole; the upper magnetic pole frame (304) is arranged on the lower magnetic pole frame (305) to form a T-shaped structure matched with the T-shaped groove (204).
The thickness of the magnetic pole frame (3) is less than or equal to 5mm, the sum of the thicknesses of the magnetic pole upper frame (304) and the magnetic pole lower frame (305) is less than or equal to 5mm, and the thicknesses of the magnetic pole upper frame and the magnetic pole lower frame are selected according to design requirements.
The composite ferromagnetic pole (2) consists of a ferromagnetic pole A (201), a ferromagnetic pole B (202) and a ferromagnetic pole C (203) subunit, the inner diameter and the outer diameter of the three subunits are different, a T-shaped groove (204) is formed in the bottom of the axial side of the composite ferromagnetic pole (2), a pole shoulder (205) extending towards the permanent magnet groove (8) is arranged at the top of the axial side of the composite ferromagnetic pole (2), the T-shaped groove (204) is of a structure for accommodating a frame claw (302) of the magnetic pole frame (3), and the pole shoulder (205) is of a structure for axially limiting and accommodating the composite permanent magnet (4) in the permanent magnet groove (8);
the side walls of the ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) form a stepped structure matched with the side wall of the composite permanent magnet (4), and the tops of the ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are spliced together to form a fan-shaped structure.
The composite permanent magnet (4) is composed of rectangular permanent magnets A (401), rectangular permanent magnets B (402) and rectangular permanent magnets C (403) subunits, the heights of the permanent magnet subunits are the same, and the widths of the permanent magnet subunits are sequentially decreased from outside to inside, so that the permanent magnets A (401), the permanent magnets B (402) and the permanent magnets C (403) are combined together to form the stepped quasi-sector composite permanent magnet.
The outer ring (5) is provided with a claw pressing groove (501), the claw pressing groove (501) is a structure which can just contain and press the end part of the frame claw (302), and the outer ring (5) is made of a non-magnetic light material.
The ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are all structures which are wound into a wound iron core (2010) by non-oriented silicon steel sheet punching grooves and are prepared by the following method: a closing groove (20101) and a T-shaped groove (204) are formed in the wound iron core (2010), and a polar surface rib (20102) and a polar bottom rib (20103) are arranged on the closing groove (20101) close to the upper bottom surface and the lower bottom surface; adhesive is coated between silicon steel sheets of the wound iron core (2010); removing partial pole gluten (20102) from wound cores (2010) with different diameters, and removing all pole bottom gluten (20103) to obtain a ferromagnetic pole A (201), a ferromagnetic pole B (202) and a ferromagnetic pole C (203).
Magnetic lines (F) emitted by passing through the adjacent composite permanent magnets (4) penetrate into the composite ferromagnetic poles (2), and finally penetrate out along the surfaces of the adjacent composite ferromagnetic poles (2) to form N, S poles which are alternately distributed.
The rotor disc (1), the magnetic pole frame (3), the outer pressure ring (5) and the inner pressure ring (6) are all made of non-magnetic plates.
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1 and 2, an internal magnetic steel composite pole rotor for an axial flux permanent magnet motor comprises a rotor disc (1), a composite ferromagnetic pole (2), a magnetic pole frame (3), a composite permanent magnet (4), an outer pressure ring (5), an inner pressure ring (6) and a fixing nail (7);
as shown in fig. 4, the composite ferromagnetic pole (2) is formed by splicing a plurality of ferromagnetic pole sub-units (three in the embodiment of the present application), and the magnetic pole frame (3) penetrates into a "T" groove (204) of the composite ferromagnetic pole (2); as shown in fig. 6, the composite permanent magnet (4) is also formed by combining and splicing a plurality of subunits, and the number of the subunits forming the composite ferromagnetic pole (2) and the composite permanent magnet (4) is the same; the composite permanent magnet (4) is arranged in a permanent magnet groove (8) between adjacent composite ferromagnetic poles (2), the permanent magnet groove (8) is a stepped fan-shaped groove formed by a plurality of rectangular grooves with different widths (the width is the distance in the A direction which is the magnetizing direction of the composite permanent magnet (4) shown in figure 6) and equal heights (the height is the distance in the B direction which is the axial direction of the composite permanent magnet (4) shown in figure 6) (the number of the rectangular grooves is the same as that of subunits of the composite permanent magnet (4), and the side surface of each rectangular groove is the direction indicated by an arrow E shown in figure 4); the composite permanent magnet (4) is of a structure which is adaptive to the shape of the permanent magnet groove (8); the number of the subunits forming the composite ferromagnetic pole (2) and the composite permanent magnet (4) is not limited to three, and can be all natural numbers;
the rotor disc (1), the magnetic pole frame (3), the outer pressure ring (5) and the inner pressure ring (6) are fastened into a whole by the fixing nails (7);
each ferromagnetic pole in the composite ferromagnetic pole (2) in fig. 4 is formed by punching and winding silicon steel sheet strips by iron core automatic punching and winding equipment, and after the same ferromagnetic pole is uniformly distributed along the circumference, the formed slot for holding the permanent magnet is rectangular, so that the defects of adopting a fan-shaped permanent magnet slot (8) and a fan-shaped permanent magnet are avoided, the manufacturing process of the ferromagnetic pole is simplified, and the manufacturing cost of the permanent magnet and the ferromagnetic pole is reduced.
The magnetic pole frame (3) comprises frame bodies (301) and frame claws (302), the frame claws (302) are uniformly arranged along the outer circumference of the annular frame body (301), the length direction of the frame claws (302) is consistent with the radial direction of the annular frame body (301) (namely, as shown in figure 5, the frame bodies (301) and the frame claws (302) are in a wheel hub-like radial shape), and the number of the frame claws (302) is consistent with the number of poles of a designed motor and is also consistent with the number of the composite ferromagnetic poles (2) and the composite permanent magnets (4); the magnetic pole frame (3) is formed by punching two non-magnetic stainless steel plates into a magnetic pole upper frame (304) and a magnetic pole lower frame (305), and then the magnetic pole upper frame and the magnetic pole lower frame are connected into a whole (welded by a multi-spot welding machine), so that the manufacturing cost of the magnetic pole frame (3) is reduced; the upper magnetic pole frame (304) is arranged on the lower magnetic pole frame (305) to form a T-shaped structure matched with the T-shaped groove (204) (namely, the upper magnetic pole frame (304) is wider (in the radial direction) than the lower magnetic pole frame (305), and the T-shaped structure is a structure capable of extending into the T-shaped groove (204) just as shown in figure 5).
The thickness (axial direction) of the magnetic pole frame (3) is less than or equal to 5mm, and the magnetic pole upper frame (304) and the magnetic pole lower frame (305) are connected into a whole (welded by a multi-point welding machine). The multi-spot welding requires that the welded thickness is not more than 5 mm; the thickness of 5mm basically meets the strength requirement; the thickness ratio of the upper magnetic pole frame (304) to the lower magnetic pole frame (305) is determined according to design requirements; the rotor disc (1) is a circular ring body, disc fixing holes (101) are formed in the inner diameter, the middle diameter and the outer diameter, and the material is light non-magnetic metal.
The composite ferromagnetic pole (2) consists of a ferromagnetic pole A (201), a ferromagnetic pole B (202) and a ferromagnetic pole C (203) subunit, the inner diameter and the outer diameter of the three subunits are different, a T-shaped groove (204) is formed in the bottom of the axial side of the composite ferromagnetic pole (2), a pole shoulder (205) extending towards the permanent magnet groove (8) is arranged at the top of the axial side of the composite ferromagnetic pole (2), the T-shaped groove (204) is of a structure for accommodating a frame claw (302) of the magnetic pole frame (3), and the pole shoulder (205) is of a structure for axially limiting and accommodating the composite permanent magnet (4) in the permanent magnet groove (8);
the side walls (the position pointed by the arrow E in fig. 4) of the ferromagnetic pole a (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) form a stepped structure adapted to the side walls of the composite permanent magnet (4), and the top parts of the ferromagnetic pole a (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are spliced together to form a fan-shaped structure (namely, the pole shoulders (205) of the ferromagnetic pole a (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are on the same inclined line, and do not form a stepped structure like the side walls).
The composite permanent magnet (4) is composed of a rectangular (also called a quadrangular prism or a cuboid) permanent magnet A (401), a rectangular permanent magnet B (402) and a rectangular permanent magnet C (403) subunit, the heights of the permanent magnet subunits (along the axial B direction) are the same and are equal to the axial height of the permanent magnet groove (8), and the widths of the permanent magnet subunits (along the magnetizing direction A) are sequentially decreased from outside to inside (namely, as shown in figure 6, the width of the permanent magnet A (401) is greater than that of the permanent magnet B (402), and the width of the permanent magnet B (402) is greater than that of the permanent magnet C (403)), so that the permanent magnet A (401), the permanent magnet B (402) and the permanent magnet C (403) are combined to form a stepped quasi-sector composite permanent magnet (namely, a structure which is just accommodated in the permanent magnet groove (8) is formed, as shown in figure 6), and the cost.
The outer pressure claw groove (501) and the outer ring locking hole (502) are formed in the outer pressure ring (5), the pressure claw groove (501) is of a structure capable of just containing and pressing the end portion of the frame claw (302) (when the outer pressure claw groove and the frame claw are assembled together, the outer circular surface of the outer pressure ring (5) is flush with the outer end surface of the frame claw (302), namely the frame claw (302) is guaranteed not to stretch out of the outer pressure ring (5), and the outer pressure ring (5) is made of a non-magnetic light material.
The ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are all structures which are wound into a wound iron core (2010) by non-oriented silicon steel sheet punching grooves and are prepared by the following method: a closing groove (20101) and a T-shaped groove (204) are formed in the wound iron core (2010), and a polar surface rib (20102) and a polar bottom rib (20103) are arranged on the closing groove (20101) close to the upper bottom surface and the lower bottom surface; adhesive is coated between silicon steel sheets of the wound iron core (2010); removing partial pole gluten (20102) (the left pole gluten (20102) forms a pole shoulder (205)) of the wound iron cores (2010) with different diameters, removing all pole bottom gluten (20103) to obtain a ferromagnetic pole A (201), a ferromagnetic pole B (202) and a ferromagnetic pole C (203) (namely the ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are all manufactured by the method, and then the obtained materials are combined into a state shown in the figure 4.
The assembly process is as follows: firstly, sequentially penetrating a ferromagnetic pole C (203), a ferromagnetic pole B (202) and a ferromagnetic pole A (201) on each claw (302); then, the surface of the non T-shaped groove side is placed on a precision platform to be flattened; secondly, sequentially arranging three rectangular permanent magnets C (403), B (402) and A (401) in a permanent magnet groove (8) from the inner diameter to the radial direction, wherein the magnetizing direction is positive (or reverse) opposite to the side wall of the ferromagnetic pole; then, the rotor disc (1) is buckled, and the assembled rotor is turned over (the rotor disc is arranged below); and finally, pressing the outer compression ring (5) and the inner compression ring (6) and fixing by using a fixing nail (7).
The number of the subunits forming the composite ferromagnetic pole (2) and the composite permanent magnet (4) is not limited to three, and can be all natural numbers, and the number of the subunits forming the composite ferromagnetic pole (2) and the composite permanent magnet (4) is the same.
Magnetic lines of force (F) sent by adjacent composite permanent magnets (4) penetrate (or penetrate) into the side wall of the composite ferromagnetic pole (2) along the magnetizing direction (A), finally, the magnetic lines of force (F) penetrate (or penetrate) out of the axial surface of the adjacent composite ferromagnetic pole (2), and alternating N, S poles formed by the rotor are formed, and compared with the same type of traditional disc motors, the alternating-axis and direct-axis inductances of the single-stator and double-rotor disc motors are improved by about 1.3-1.8 times (the values of the alternating-axis and direct-axis inductances are both increased).
Compared with the traditional surface-mounted rotor structure disc motor, the disc motor adopting the rotor structure saves the permanent magnet consumption by 10-20%; the rotor disc (1), the magnetic pole frame (3), the outer pressure ring (5) and the inner pressure ring (6) are all made of non-magnetic plates, and the parts are simple in shape, small in machining amount, simple to assemble and low in manufacturing cost.
Claims (9)
1. A built-in magnetic steel composite pole rotor for an axial flux permanent magnet motor is characterized by comprising a rotor disc (1), a composite ferromagnetic pole (2), a magnetic pole frame (3), a composite permanent magnet (4), an outer pressure ring (5) and an inner pressure ring (6);
the composite ferromagnetic pole (2) is formed by splicing a plurality of ferromagnetic pole subunits, the magnetic pole frame (3) penetrates into a T-shaped groove (204) of the composite ferromagnetic pole (2), the composite permanent magnet (4) is formed by combining and splicing a plurality of subunits, and the number of subunits forming the composite ferromagnetic pole (2) is the same as that of the subunits forming the composite permanent magnet (4); the composite permanent magnet (4) is arranged in a permanent magnet groove (8) between the adjacent composite ferromagnetic poles (2), and the permanent magnet groove (8) is a step-shaped groove formed by a plurality of rectangular grooves with different widths and equal heights; the composite permanent magnet (4) is in a structure which is adaptive to the shape of the permanent magnet groove (8).
2. The built-in magnetic steel composite pole rotor for the axial flux permanent magnet motor is characterized in that a magnetic pole frame (3) comprises a frame body (301) and frame claws (302), the frame claws (302) are uniformly arranged along the outer circumference of the annular frame body (301), the length direction of the frame claws (302) is consistent with the radial direction of the annular frame body (301), the number of the frame claws (302) is consistent with the number of poles of the designed motor and is also consistent with the number of composite ferromagnetic poles (2) and composite permanent magnets (4); the magnetic pole frame (3) is formed by punching two pieces of non-magnetic stainless steel plates into a magnetic pole upper frame (304) and a magnetic pole lower frame (305) which are connected into a whole; the upper magnetic pole frame (304) is arranged on the lower magnetic pole frame (305) to form a T-shaped structure matched with the T-shaped groove (204).
3. The inner magnetic steel composite pole rotor for the axial flux permanent magnet motor is characterized in that the thickness of the magnetic pole frame (3) is less than or equal to 5mm, and the sum of the thicknesses of the magnetic pole upper frame (304) and the magnetic pole lower frame (305) is less than or equal to 5 mm.
4. The rotor with the built-in magnetic steel composite poles for the axial flux permanent magnet motor is characterized in that the composite ferromagnetic pole (2) consists of subunits of a ferromagnetic pole A (201), a ferromagnetic pole B (202) and a ferromagnetic pole C (203), the inner diameters and the outer diameters of the subunits are different, a T-shaped groove (204) is formed in the bottom of the axial side of the composite ferromagnetic pole (2), a pole shoulder (205) extending towards a permanent magnet groove (8) is formed in the top of the axial side of the composite ferromagnetic pole (2), the T-shaped groove (204) is of a structure for accommodating a frame claw (302) of a magnetic pole frame (3), and the pole shoulder (205) is of a structure for axially limiting and accommodating the composite permanent magnet (4) in the permanent magnet groove (8);
the side walls of the ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) form a stepped structure matched with the side wall of the composite permanent magnet (4), and the tops of the ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are spliced together to form a fan-shaped structure.
5. The internally-arranged magnetic steel composite pole rotor for the axial flux permanent magnet motor is characterized in that a composite permanent magnet (4) consists of rectangular permanent magnet A (401), rectangular permanent magnet B (402) and rectangular permanent magnet C (403) subunits, the heights of the permanent magnet subunits are the same, and the widths of the permanent magnet subunits are sequentially reduced from outside to inside, so that the permanent magnet A (401), the permanent magnet B (402) and the permanent magnet C (403) are combined together to form a stepped quasi-sector composite permanent magnet.
6. The built-in magnetic steel composite pole rotor for the axial flux permanent magnet motor is characterized in that a claw pressing groove (501) is formed in the outer ring (5), the claw pressing groove (501) is of a structure capable of just accommodating and pressing the end portion of the frame claw (302), and the outer ring (5) is made of a non-magnetic-conductive light material.
7. The interior magnetic steel composite pole rotor for the axial flux permanent magnet motor according to claim 4, wherein the ferromagnetic pole A (201), the ferromagnetic pole B (202) and the ferromagnetic pole C (203) are all structures which are wound iron cores (2010) formed by winding non-oriented silicon steel sheet slots and are prepared by the following method: a closing groove (20101) and a T-shaped groove (204) are formed in the wound iron core (2010), and a polar surface rib (20102) and a polar bottom rib (20103) are arranged on the closing groove (20101) close to the upper bottom surface and the lower bottom surface; adhesive is coated between silicon steel sheets of the wound iron core (2010); removing partial pole gluten (20102) from wound cores (2010) with different diameters, and removing all pole bottom gluten (20103) to obtain a ferromagnetic pole A (201), a ferromagnetic pole B (202) and a ferromagnetic pole C (203).
8. The internally-arranged magnetic steel composite pole rotor for the axial flux permanent magnet motor is characterized in that magnetic lines of force (F) emitted by passing through adjacent composite permanent magnets (4) penetrate into composite ferromagnetic poles (2), and finally the magnetic lines of force (F) penetrate out along the surfaces of the adjacent composite ferromagnetic poles (2) to form N, S poles which are distributed alternately.
9. The built-in magnetic steel composite pole rotor for the axial flux permanent magnet motor is characterized in that the rotor disc (1), the magnetic pole frame (3), the outer pressure ring (5) and the inner pressure ring (6) are all made of non-magnetic conductive plates.
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| CN202010836066.XA CN112134381B (en) | 2020-08-19 | 2020-08-19 | Built-in magnetic steel composite pole rotor for axial flux permanent magnet motor |
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