KR20210115768A - Magnetic flux leakage reduction permanent magnet synchronous motor - Google Patents

Abstract

The present invention relates to a magnetic flux leakage reduction type permanent magnet synchronous motor, comprising: a rotor disk which includes an outer circumferential surface in a cylindrical shape; a plurality of rotating magnetic pole iron cores which are separated and coupled along the outer circumferential surface; a plurality of permanent magnets which are respectively inserted between the plurality of rotating magnetic pole iron cores; a rotating pole fixing ring which has one surface coupled to the outer circumferential surface and the other surface coupled to each of the plurality of rotating magnetic pole iron cores and the plurality of permanent magnets; a plurality of fixing bolts which respectively fixes the plurality of rotating magnetic pole iron cores to the rotor disk; and a plurality of end plates which support the plurality of rotating magnetic pole iron cores and the plurality of permanent magnets by penetrating and coupling each fixing bolt for the fixing.

Description

Permanent magnet synchronous motor with reduced magnetic flux leakage {MAGNETIC FLUX LEAKAGE REDUCTION PERMANENT MAGNET SYNCHRONOUS MOTOR}

The present invention relates to a permanent magnet synchronous motor, and more particularly, to a magnetic flux leakage reduction type permanent magnet synchronous motor capable of preventing magnetic flux leakage of a rotation center by individually assembling a separate pole piece in a rotor.

The electric motor rotates about a rotating shaft and includes a rotor in which permanent magnets are arranged, and a stator located around the rotor, and when power is supplied to the stator, the rotor rotates to generate driving force.

In general, synchronous motors using permanent magnets (PERMANENT MAGNET SYNCHRONOUS MOTOR, PMSM) use rare-earth magnets to increase output, but non-rare-earth magnets (ferrites) can be used by applying a magnetic flux-concentrated spoke-type magnetic pole structure.

Permanent magnet synchronous motors of the spoke type have a problem of lowering output due to a large amount of flux leakage from the center of the rotor to the adjacent magnets due to the structure of the magnet arrangement. Reduce the leakage of magnetic flux to adjacent magnets by increasing the magnetoresistance by installing or inserting a non-magnetic metal into the shaft.

In order to prevent magnetic flux leakage, the pore barrier should be enlarged, but structurally there is a limit, and inserting a non-magnetic material requires precise machining, which is inconvenient in workability and disadvantageous in productivity.

Korean Patent Publication No. 10-2000-0051405 (2000.08.16)

An embodiment of the present invention is to provide a magnetic flux leakage reduction type permanent magnet synchronous motor capable of preventing magnetic flux leakage of a rotation center by individually assembling a separate pole piece in a rotor.

In one embodiment of the present invention, separate separate pole pieces are assembled in a rotor pole fixing ring injection molded with structurally and electrically stable BMC resin, and non-rare earth permanent magnets (ferrite) are inserted between each pole piece. Thus, it is intended to provide a magnetic flux leakage reduction type permanent magnet synchronous motor that treats the inner diameter of the rotating magnetic pole with an air gap and prevents magnetic flux leakage at the center of rotation, which is the weak point of the SPOKE structure.

Among the embodiments, the magnetic flux leakage reduction type permanent magnet synchronous motor includes a rotor disk (DISK) including a cylindrical outer peripheral surface, a plurality of rotating magnetic pole iron cores separated and coupled along the outer peripheral surface, and between the plurality of rotating magnetic pole iron cores. A plurality of permanent magnets respectively inserted into the rotating magnetic pole fixing ring, one surface is coupled to the outer peripheral surface and the other surface is respectively coupled to the plurality of rotating magnetic pole iron cores and the plurality of permanent magnets, the plurality of rotating magnetic pole iron cores A plurality of fixing bolts (BOLT) respectively fixed to the rotor disk, and a plurality of end plates for supporting the plurality of rotating magnetic pole iron cores and the plurality of permanent magnets by penetrating each fixing bolt for the fixing. ) are included.

Each of the rotor disk, the rotational pole fixing ring, and the plurality of rotational pole iron cores may include a through hole for through coupling with each fixing bolt.

The rotating magnetic pole fixing ring may include a plurality of slots (SLOT) manufactured by injection molding using a BULK MOLDING COMPOUND (BMC), and each of the plurality of rotating magnetic pole iron cores is independently accommodated.

The rotating magnetic pole fixing ring may be formed of a non-magnetic material to prevent magnetic flux leakage in the axial direction.

Each of the plurality of rotating magnetic pole iron cores may be provided with coupling grooves for separation and coupling with the permanent magnets on both side portions to prevent separation of the permanent magnets.

Each of the plurality of end plates includes a plate-shaped body, a first groove for through coupling with a fixing bolt is formed at a central position of the body, and semicircular second grooves are formed at both ends of the body, respectively. can

The disclosed technology may have the following effects. However, this does not mean that a specific embodiment should include all of the following effects or only the following effects, so the scope of the disclosed technology should not be construed as being limited thereby.

The magnetic flux leakage reduction type permanent magnet synchronous motor according to an embodiment of the present invention can prevent magnetic flux leakage at the center of rotation by individually assembling the separate magnetic pole pieces in the rotor.

In the magnetic flux leakage reduction type permanent magnet synchronous motor according to an embodiment of the present invention, a separate separate pole piece is assembled in a rotor with a structurally and electrically stable BMC resin injection-molded rotating pole fixing ring, and between each pole piece By inserting a non-rare earth permanent magnet (ferrite) into the pole, the inner diameter of the rotating magnetic pole is treated as an air gap to prevent magnetic flux leakage at the center of rotation, which is the weak point of the SPOKE structure.

1 is a conceptual diagram illustrating a magnetic flux leakage reduction type permanent magnet synchronous motor according to the present invention.
2 is a view for explaining the physical configuration of the magnetic flux leakage reduction type permanent magnet synchronous motor according to the present invention.
3 is a view for explaining the configuration of the rotating magnetic pole iron core according to the present invention.
4 is a view for explaining the configuration of the end plate according to the present invention.

Since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiment described in the text. That is, since the embodiment may have various changes and may have various forms, it should be understood that the scope of the present invention includes equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such effects, it should not be understood that the scope of the present invention is limited thereby.

On the other hand, the meaning of the terms described in the present application should be understood as follows.

Terms such as “first” and “second” are for distinguishing one component from another, and the scope of rights should not be limited by these terms. For example, a first component may be termed a second component, and similarly, a second component may also be termed a first component.

When a component is referred to as being “connected” to another component, it may be directly connected to the other component, but it should be understood that other components may exist in between. On the other hand, when it is mentioned that a certain element is "directly connected" to another element, it should be understood that the other element does not exist in the middle. Meanwhile, other expressions describing the relationship between elements, that is, “between” and “immediately between” or “neighboring to” and “directly adjacent to”, etc., should be interpreted similarly.

The singular expression is to be understood to include the plural expression unless the context clearly dictates otherwise, and terms such as "comprises" or "have" refer to the embodied feature, number, step, action, component, part or these It is intended to indicate that a combination exists, and it should be understood that it does not preclude the possibility of the existence or addition of one or more other features or numbers, steps, operations, components, parts, or combinations thereof.

Identifiers (eg, a, b, c, etc.) in each step are used for convenience of description, and the identification code does not describe the order of each step, and each step clearly indicates a specific order in context. Unless otherwise specified, it may occur in a different order from the specified order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

The present invention can be embodied as computer-readable codes on a computer-readable recording medium, and the computer-readable recording medium includes all types of recording devices in which data readable by a computer system is stored. . Examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like. In addition, the computer-readable recording medium may be distributed in a network-connected computer system, and the computer-readable code may be stored and executed in a distributed manner.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Terms defined in general used in the dictionary should be interpreted as being consistent with the meaning in the context of the related art, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present application.

1 is a conceptual diagram illustrating a magnetic flux leakage reduction type permanent magnet synchronous motor according to the present invention. 2 is a view for explaining the physical configuration of the magnetic flux leakage reduction type permanent magnet synchronous motor according to the present invention. 3 is a view for explaining the configuration of the rotating magnetic pole iron core according to the present invention. 4 is a view for explaining the configuration of the end plate according to the present invention.

Hereinafter, the configuration of the present invention will be described in more detail with reference to FIGS. 2 to 4 .

Magnetic flux leakage reduction type permanent magnet synchronous motor 100 includes a rotor disk 110, a rotating magnetic pole fixing ring 120, a rotating magnetic pole iron core 130, a permanent magnet 140, an end plate 150, and a fixing bolt 160 ) may be included.

In FIG. 1 , the rotor disk 110 may be formed in a cylindrical shape, and the rotation pole fixing ring 120 and the rotation pole iron core 130 may be sequentially coupled to the outer circumferential surface of the cylindrical shape.

The rotating magnetic pole fixing ring 120 may be formed in a circular ring shape, and is coupled to the outer circumferential surface of the rotor disk 110 to serve to couple the rotor disk 110 and the rotating magnetic pole iron core 130 . . That is, the inner peripheral surface of the rotating magnetic pole fixing ring 120 is coupled to the outer peripheral surface of the rotor disk 110 , and the outer peripheral surface of the rotating magnetic pole fixing ring 120 includes a plurality of rotational pole iron cores 130 and a plurality of permanent magnets 140 . ) can be combined with

In one embodiment, the rotational pole fixing ring 120 is manufactured by injection molding using BULK MOLDING COMPOUND (BMC), and may include a plurality of slots SLOT in which each of the plurality of rotational pole iron cores is independently accommodated. . Here, BULK MOLDING COMPOUND (BMC) uses an unsaturated polyester resin as a base, and an additive such as a low-shrinkage agent, an internal release agent, and a filler is mixed with glass fiber strands uniformly dispersed in a compound. , it may correspond to a thermosetting composite molding material in bulk with excellent formability made by training.

In particular, because BMC has excellent fluidity, it is possible to form complex shapes or large products, and has excellent mechanical and electrical properties. It has excellent properties, has a high thermal deformation temperature, low aging due to heat, and excellent surface gloss, so that it can have the characteristics of being able to diversify colors.

That is, since the rotating magnetic pole fixing ring 120 supports the detachable rotating magnetic pole iron core 130 and the permanent magnet 140, structural rigidity is maintained, the linear expansion coefficient is small, the dimensional stability is good, and BMC can be mass-produced by injection molding. can be implemented based on

In addition, in FIG. 2 , the rotational pole fixing ring 120 includes a plurality of slots SLOTs capable of independently accommodating each of the rotational pole iron cores 130 in order to be stably coupled with the plurality of rotational pole iron cores 130 . may include Each slot SLOT may be formed to correspond to the shape of the rotating magnetic pole iron core 130 , and a protrusion for physically separating the slots may be formed between each slot SLOT.

In one embodiment, the rotating magnetic pole fixing ring 120 may be formed of a non-magnetic material to prevent magnetic flux leakage in the axial direction. That is, in FIGS. 1 and 2, the rotating magnetic pole fixing ring 120 may be disposed between the rotor disk 110 and the rotating magnetic pole iron core 130, and in the axial direction, that is, the rotor disk ( 110) can serve to block the leakage of magnetic flux into the interior.

In a thin-structured synchronous motor (PMSM), the rotor inner diameter is void by inserting the rotating pole iron core 130 into the rotating pole fixing ring 120 without directly pressing the rotor into the shaft and fixing it to the rotor disk 110 . It is possible to reduce magnetic flux leakage by maximizing the magnetic resistance to adjacent magnets.

The rotating magnetic pole core 130 may be formed of a ferromagnetic material having high magnetic permeability, and may serve as a passage for magnetic flux from the permanent magnet 140 . For example, the rotating magnetic pole core 130 may be implemented with a ferromagnetic material such as iron or a ferromagnetic compound such as ferrite, and may concentrate magnetic flux on the iron core by using a high magnetic permeability.

In an embodiment, the rotating magnetic pole core 130 may be alternately positioned with the permanent magnet 140 , and may be formed in a fan shape extending radially outward from the rotating shaft. At this time, the side surfaces of the rotating magnetic pole iron core 130 may be coupled to each other in contact with the side surfaces of the permanent magnet 140 , and accordingly, the side surfaces of the rotating magnetic pole iron core 130 and the permanent magnet 140 have a shape corresponding to each other. can be implemented.

In one embodiment, the rotating magnetic pole iron core 130 is provided with coupling grooves for separation and coupling with the permanent magnet 140 on both side portions to prevent the permanent magnet 140 from being separated. More specifically, the rotational pole iron core 130 may be through-coupled with the fixing bolt 160 by including a through-hole 310 on the central axis, through which it is coupled to the rotational pole fixing ring 120 and rotates at the same time. It may be fastened to the electronic disk 110 . 3, the rotating magnetic pole iron core 130 may be separately coupled to the permanent magnet 140 on both side portions, respectively, and may include a coupling groove for this purpose. That is, the rotating magnetic pole iron core 130 can prevent the permanent magnet 140 from being separated when the centrifugal force is increased according to the rotation of the rotor by disposing the permanent magnet 140 in the coupling groove.

In one embodiment, the rotating magnetic pole iron core 130 may include a semi-circular inner groove formed by a side surface in the direction of the rotation axis is depressed in the inner direction of the iron core. In this case, the inner groove may serve to prevent leakage of magnetic flux. In FIG. 3 , the inner groove may be formed in the lower portion of the through hole 310 .

The permanent magnet 140 corresponds to a magnet that preserves a strong magnetization state for a long time and may form a magnetic field. The permanent magnet 140 may be disposed radially outward from the rotation shaft, and may be respectively inserted between the plurality of rotating magnetic pole iron cores 130 . That is, the permanent magnet 140 and the rotating magnetic pole core 130 may be alternately positioned with each other, and a predetermined distance may be maintained between the permanent magnets 140 . The permanent magnet 140 may transmit a driving force that rotates about a rotation axis according to a current flowing in the stator.

Meanwhile, in FIG. 3 , the permanent magnet 140 is expressed in a rectangular shape, but is not necessarily limited thereto, and may be implemented in various shapes depending on the implementation environment. For example, the permanent magnet 140 may have a trapezoidal cross-section, and in this case, the side surface of the rotating magnetic pole core 130 may be formed to correspond to the side surface of the permanent magnet 140 .

The end plate 150 may be through-coupled with each fixing bolt 160 to support the plurality of rotational pole iron cores 130 and the plurality of permanent magnets 140 . To this end, the end plate 150 is implemented in a form that is elongated in both directions around the through hole to simultaneously support the rotational pole iron core 130 and the permanent magnets 140 coupled to both sides.

In one embodiment, the end plate 150 includes a plate-shaped body, a first groove for through coupling with a fixing bolt is formed at a central position of the body, and semicircular second grooves are formed at both ends of the body, respectively. can be formed. In FIG. 4 , the end plate 150 may include a first groove 410 through which the fixing bolt 160 passes, and semicircular second grooves 420 may be formed at both ends, respectively. In this case, the size, number, and position of the second grooves 420 may be changed according to the arrangement structure between the plurality of end plates 150 .

The fixing bolt 160 may function to fix the plurality of rotational pole iron cores 130 to the rotor disk 110 in conjunction with the end plate 150 , respectively. More specifically, in FIG. 1 , the fixing bolt 160 is sequentially through-coupled with the rotation pole iron core 130 , the rotation pole fixing ring 120 and the rotor disk 110 after being through-coupled with the end plate 150 , It is possible to provide a supporting force for fixing for each rotational pole iron core 130 .

In one embodiment, each of the rotor disk 110 , the rotation pole fixing ring 120 , and the plurality of rotation pole iron cores 130 may include a through hole for through coupling with each fixing bolt 160 . For example, in FIG. 3 , the rotating magnetic pole core 130 may form a through hole 310 at a point moved by a predetermined distance from the center downward with respect to a central axis extending outward from the rotation axis. In addition, the rotor disk 110 and the rotation pole fixing ring 120 may each include a through hole corresponding to the through hole 310 of each rotation pole iron core 130 . Since the rotor disk 110 and the rotating magnetic pole fixing ring 120 are coupled to the plurality of rotational pole iron cores 130 , the rotor disk 110 and the rotational pole fixing ring 120 are the plurality of rotational pole iron cores 130 . ) may include as many through-holes as the number of.

The magnetic flux leakage reduction type permanent magnet synchronous motor 100 according to the present invention includes a rotor disk 110, a rotating pole fixing ring 120, a rotating pole iron core 130, a permanent magnet 140, an end plate 150, and A fixing bolt 160 may be included. First, the rotating magnetic pole fixing ring 120 may be inserted into the rotor disk 110 , and the rotating magnetic pole iron core divided into the slots of the rotation pole fixing ring 120 injection molded to fit the shape of the rotating magnetic pole iron core 130 . 130 may be inserted. At this time, a permanent magnet 140 may be inserted between the rotating magnetic pole core 130 . The end plate 150 and the fixing bolt 160 may be used to couple the rotating magnetic pole iron core 130 and the permanent magnet 140 to the rotor disk 110 .

The magnetic flux leakage reduction type permanent magnet synchronous motor 100 according to the present invention can prevent magnetic flux leakage by fixing the rotor iron core (pole piece) to the side of the rotor disk 110 and treating the rotation center with an air gap. It can be useful for PMSM of structures. In addition, since the magnetic flux leakage reduction type permanent magnet synchronous motor 100 has a structure in which the pole pieces are separated and assembled, the permanent magnet can be easily inserted.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it can be done.

100: magnetic flux leakage reduction type permanent magnet synchronous motor
110: rotor disk 120: rotating magnetic pole fixing ring
130: rotation pole iron core 140: permanent magnet
150: end plate 160: fixing bolt
310: through hole
410: first groove 420: second groove

Claims (6)

Rotor disk (DISK) comprising an outer peripheral surface of a cylindrical shape;
a plurality of rotating magnetic pole iron cores separated and coupled along the outer circumferential surface;
a plurality of permanent magnets respectively inserted between the plurality of rotating magnetic pole cores;
a rotating magnetic pole fixing ring having one surface coupled to the outer circumferential surface and the other surface coupled to the plurality of rotational pole iron cores and the plurality of permanent magnets, respectively;
a plurality of fixing bolts (BOLT) for fixing the plurality of rotating magnetic pole iron cores to the rotor disk, respectively; and
A magnetic flux leakage reduction type permanent magnet synchronous motor including a plurality of end plates for supporting the plurality of rotating magnetic pole iron cores and the plurality of permanent magnets through coupling with each fixing bolt for the fixing.
According to claim 1,
The magnetic flux leakage reduction type permanent magnet synchronous motor, characterized in that each of the rotor disk, the rotating magnetic pole fixing ring, and the plurality of rotating magnetic pole iron cores includes a through hole for through coupling with each fixing bolt.
According to claim 1, wherein the rotation pole fixing ring is
A reduced magnetic flux leakage type permanent magnet synchronous motor manufactured by injection molding using a BULK MOLDING COMPOUND (BMC) and comprising a plurality of slots (SLOTs) in which each of the plurality of rotating magnetic poles is independently accommodated.
According to claim 1, wherein the rotation pole fixing ring is
Magnetic flux leakage reduction type permanent magnet synchronous motor, characterized in that it is formed of a non-magnetic material to prevent magnetic flux leakage in the axial direction.
The method of claim 1, wherein each of the plurality of rotating magnetic pole iron cores is
A magnetic flux leakage reduction type permanent magnet synchronous motor, characterized in that both side portions are provided with coupling grooves for separation and coupling with the permanent magnets to prevent the permanent magnets from being separated.
According to claim 1, wherein each of the plurality of end plates
A magnetic flux leakage reduction type comprising a plate-shaped body, wherein a first groove for penetration coupling with a fixing bolt is formed at a central position of the body, and semicircular second grooves are formed at both ends of the body, respectively Permanent magnet synchronous motor.

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