JPH1146464A - Permanent magnet motor - Google Patents
Permanent magnet motorInfo
- Publication number
- JPH1146464A JPH1146464A JP9199925A JP19992597A JPH1146464A JP H1146464 A JPH1146464 A JP H1146464A JP 9199925 A JP9199925 A JP 9199925A JP 19992597 A JP19992597 A JP 19992597A JP H1146464 A JPH1146464 A JP H1146464A
- Authority
- JP
- Japan
- Prior art keywords
- stator
- permanent magnet
- rotor
- iron core
- magnet motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、固定子の中央部に
形成された空間に、永久磁石を具えた回転子を回転可能
に収容し、回転子を包囲して配設された複数相の巻線に
順次通電することによって、回転子を回転させる永久磁
石モータに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor having permanent magnets, which is rotatably accommodated in a space formed in the center of a stator, and is provided with a plurality of phases surrounding the rotor. The present invention relates to a permanent magnet motor that rotates a rotor by sequentially energizing windings.
【0002】[0002]
【従来の技術】図5は、従来の永久磁石モータの構造を
表わしており、円筒状の固定子(2)の中央部に形成され
た空間に、円柱状の回転子(10)が回転可能に収容されて
いる。固定子(2)は、リング状の固定子鉄芯(21)を具
え、該固定子鉄芯(21)の内周面には、回転子(10)を包囲
して、回転子(10)の軸方向に貫通する24個のスロット
(22a)(22b)(22c)が等間隔に凹設されている。具体的に
は、U相スロット(22a)、V相スロット(22b)及びW相ス
ロット(22c)が、反時計回りに2つずつ繰り返し凹設さ
れている。そして、U相スロット(22a)、V相スロット
(22b)及びW相スロット(22c)に夫々、U相巻線(23)、V
相巻線(24)及びW相巻線(25)が巻き付けられている。2. Description of the Related Art FIG. 5 shows the structure of a conventional permanent magnet motor, in which a cylindrical rotor (10) is rotatable in a space formed in the center of a cylindrical stator (2). Is housed in The stator (2) includes a ring-shaped stator core (21), and an inner peripheral surface of the stator core (21) surrounds the rotor (10), and the rotor (10) 24 slots penetrating in the axial direction
(22a), (22b) and (22c) are recessed at equal intervals. Specifically, a U-phase slot (22a), a V-phase slot (22b), and a W-phase slot (22c) are repeatedly recessed two by two in a counterclockwise direction. And U-phase slot (22a), V-phase slot
(22b) and W-phase slot (22c), respectively,
A phase winding (24) and a W-phase winding (25) are wound.
【0003】一方、回転子(10)は、断面形状が正方形の
軸部(14a)と、該軸部(14a)の4つの角部から固定子(2)
に向かって伸びる4本のアーム部(14b)(14b)(14b)(14b)
とからなる中央部鉄芯(14)を有している。尚、中央部鉄
芯(14)は、薄板状の鉄片を多数枚積層して形成される。
中央部鉄芯(14)の軸部(14a)の中心部には、出力軸(3)
が貫通して固定されている。又、軸部(14a)の外周面に
は、出力軸(3)を包囲して、長方形の断面形状を有する
と共に径方向に着磁された4つの永久磁石(5)(5)(5)
(5)が固定されている。ここで、隣り合う永久磁石(5)
(5)は、互いに逆方向に着磁されている。On the other hand, a rotor (10) is composed of a shaft (14a) having a square cross section and four corners of the shaft (14a).
Four arms extending toward (14b) (14b) (14b) (14b)
And a central iron core (14). The central iron core (14) is formed by laminating a large number of thin iron pieces.
The output shaft (3) is located at the center of the shaft (14a) of the central iron core (14).
Is fixed therethrough. On the outer peripheral surface of the shaft portion (14a), four permanent magnets (5), (5), (5), which surround the output shaft (3), have a rectangular cross-sectional shape, and are magnetized in the radial direction.
(5) is fixed. Here, adjacent permanent magnets (5)
(5) is magnetized in opposite directions.
【0004】そして永久磁石(5)(5)(5)(5)の固定子
(2)側の表面に、扇形の断面形状を有する外周部鉄芯(1
5)(15)(15)(15)が固定され、隣り合う外周部鉄芯(15)(1
5)と中央部鉄芯(14)のアーム部(14b)は、連結鉄芯(16)
によって互いに連結されている。中央部鉄芯(14)のアー
ム部(14b)と外周部鉄芯(15)との間には、外周部鉄芯(1
5)から直接にアーム部(14b)へ至る漏洩磁束を減少させ
るための空隙(12)が形成されている。尚、外周部鉄芯(1
5)及び連結鉄芯(16)は、中央部鉄芯(14)と同様に、薄板
状の鉄片を多数枚積層して形成される。[0004] The stator of the permanent magnet (5) (5) (5) (5)
(2) On the surface on the side, an outer peripheral iron core (1
5) (15) (15) (15) is fixed and the outer peripheral iron core (15) (1
5) and the arm part (14b) of the central iron core (14), the connecting iron core (16)
Are connected to each other. Between the arm portion (14b) of the central iron core (14) and the outer peripheral iron core (15), the outer peripheral iron core (1
An air gap (12) is formed to reduce the magnetic flux leakage from 5) directly to the arm (14b). The outer core (1
5) and the connection iron core (16) are formed by laminating a large number of thin plate-like iron pieces, similarly to the center iron core (14).
【0005】上記永久磁石モータにおいては、図示省略
する制御回路によって、U相巻線(23)及びV相巻線(2
4)、V相巻線(24)及びW相巻線(25)、W相巻線(25)及び
U相巻線(23)に順次、繰り返し通電する。これによっ
て、通電中の巻線に、永久磁石(5)から発生して巻線を
貫通する磁力線との関係で、フレミングの左手の法則に
基づく電磁力が生じ、該電磁力により回転子(10)が回転
することになる。In the above-described permanent magnet motor, a U-phase winding (23) and a V-phase winding (2
4) The V-phase winding (24) and the W-phase winding (25), the W-phase winding (25) and the U-phase winding (23) are repeatedly energized sequentially. As a result, an electromagnetic force based on Fleming's left hand rule is generated in the energized winding in relation to the lines of magnetic force generated from the permanent magnet (5) and penetrating the winding, and the electromagnetic force causes the rotor (10 ) Will rotate.
【0006】[0006]
【発明が解決しようとする課題】図6は、上記永久磁石
モータの駆動時において、回転子(10)に最も大きな回転
トルクが発生するときの磁力線分布を表わしており、永
久磁石(5)の磁力線放射面と通電中のW相巻線(25)及び
U相巻線(23)とが互いに対向している。この状態では、
W相巻線(25)及びU相巻線(23)に発生する電磁力によっ
て、回転子(10)に最大の回転トルクが作用する。しかし
ながら、該永久磁石モータにおいては、永久磁石(5)か
ら発生した磁力線は、図示の如く放射状に拡がって、回
転子(10)の回転に寄与しないV相巻線(24)をも通過して
おり、これが損失となって高い効率が得られない問題が
あった。本発明の目的は、従来よりも高効率の永久磁石
モータを提供することである。FIG. 6 shows the distribution of the lines of magnetic force when the largest rotational torque is generated in the rotor (10) when the permanent magnet motor is driven. The magnetic field radiation surface and the energized W-phase winding (25) and U-phase winding (23) face each other. In this state,
The maximum rotational torque acts on the rotor (10) by the electromagnetic force generated in the W-phase winding (25) and the U-phase winding (23). However, in the permanent magnet motor, the magnetic lines of force generated from the permanent magnet (5) spread radially as shown in the figure and pass through the V-phase winding (24) which does not contribute to the rotation of the rotor (10). As a result, there is a problem that high efficiency cannot be obtained due to this loss. An object of the present invention is to provide a permanent magnet motor with higher efficiency than before.
【0007】[0007]
【課題を解決する為の手段】本発明に係る永久磁石モー
タは、固定子(2)の中央部に形成された空間に回転子
(1)を回転可能に収容して構成され、固定子(2)には、
回転子(1)を包囲する複数位置に、回転子(1)の回転軸
と平行に伸びる複数相の巻線が配設される一方、回転子
(1)には、回転軸を包囲する複数位置に、回転軸とは直
交する径方向に着磁された複数の永久磁石(5)が配設さ
れると共に、各永久磁石(5)の固定子(2)側の表面に接
触させて複数の外周部鉄芯(15)が配設され、前記複数相
の巻線に順次通電することによって、回転子(1)を回転
させるものである。各外周部鉄芯(15)には、各永久磁石
(5)と固定子(2)に挟まれた領域に、各永久磁石(5)と
固定子(2)の間に発生する磁力線を外周部鉄芯(15)の中
央部に集束させるための低透磁率部が形成されている。According to the present invention, there is provided a permanent magnet motor including a rotor provided in a space formed in a central portion of a stator.
(1) is rotatably housed, and the stator (2) includes:
At a plurality of positions surrounding the rotor (1), a multi-phase winding extending in parallel with the rotation axis of the rotor (1) is disposed.
In (1), a plurality of permanent magnets (5) magnetized in a radial direction perpendicular to the rotating shaft are disposed at a plurality of positions surrounding the rotating shaft, and the respective permanent magnets (5) are fixed. A plurality of outer peripheral iron cores (15) are disposed in contact with the surface on the side of the child (2), and the rotor (1) is rotated by sequentially energizing the windings of the plurality of phases. Each permanent magnet (15) has a permanent magnet
In the area sandwiched between (5) and the stator (2), the magnetic field lines generated between each of the permanent magnets (5) and the stator (2) are focused on the central part of the outer peripheral iron core (15). A low magnetic permeability portion is formed.
【0008】本発明に係る永久磁石モータにおいては、
低透磁率部は外周部鉄芯(15)の他の領域に比べて磁力線
が通り難いため、各永久磁石(5)と固定子(2)の間に発
生する磁力線は、外周部鉄芯(15)の中央部に集束する。
これによって、永久磁石(5)から発生した磁力線の殆ど
が、通電中の巻線を貫通することとなって、通電中の巻
線に大きな電磁力が発生し、この大きな電磁力によっ
て、回転子(1)に大きな回転トルクが発生することにな
る。この結果、回転子(1)が効率的に回転駆動される。[0008] In the permanent magnet motor according to the present invention,
Since the magnetic permeability lines of the low magnetic permeability portion are harder to pass than other regions of the outer peripheral iron core (15), the magnetic lines of force generated between each permanent magnet (5) and the stator (2) are formed by the outer peripheral iron core (15). Focus on the center of 15).
As a result, most of the magnetic lines of force generated from the permanent magnet (5) penetrate through the energized windings, and a large electromagnetic force is generated in the energized windings. A large rotation torque is generated in (1). As a result, the rotor (1) is efficiently rotated.
【0009】具体的には、低透磁率部は、各外周部鉄芯
(15)を回転子(1)の軸方向に貫通して開設された一対の
貫通孔(13)(13)から構成され、該一対の貫通孔(13)(13)
は、各永久磁石(5)と固定子(2)の間に発生する磁力線
の磁気的中心線を挟んで両側に配置されている。[0009] Specifically, the low magnetic permeability portion is provided at each outer peripheral iron core.
(15) is constituted by a pair of through holes (13) and (13) opened through the rotor (1) in the axial direction, and the pair of through holes (13) and (13)
Are arranged on both sides of the magnetic center line of the magnetic force generated between each permanent magnet (5) and the stator (2).
【0010】該具体的構成においては、空気は鉄芯より
も透磁率が低いため、一対の貫通孔(13)(13)が低透磁率
部を構成することとなって、各永久磁石(5)と固定子
(2)の間に発生する磁力線は、一対の貫通孔(13)(13)の
間に挟まれた領域に集束することになる。該具体的構成
によれば、外周部鉄芯(15)に2つの貫通孔(13)(13)を設
けた簡易な構成によって、低透磁率部を形成することが
出来る。In this specific configuration, since air has a lower magnetic permeability than the iron core, a pair of through holes (13) and (13) constitutes a low magnetic permeability portion, and each permanent magnet (5 ) And stator
The lines of magnetic force generated during (2) converge in a region sandwiched between the pair of through holes (13) (13). According to this specific configuration, a low magnetic permeability portion can be formed by a simple configuration in which two through holes (13) and (13) are provided in the outer peripheral iron core (15).
【0011】又、具体的には、前記一対の貫通孔(13)(1
3)は、回転子(1)の回転軸とは直交する断面にて、夫々
が細長いスリット形状を有すると共に、固定子(2)に向
かって互いの間隔が狭まっている。該具体的構成によれ
ば、磁力線の集束効果を更に高めることが出来、これに
よって回転子(1)をより効率的に回転駆動することが出
来る。More specifically, the pair of through holes (13) (1)
3), each of which has an elongated slit shape in a cross section orthogonal to the rotation axis of the rotor (1), and has a smaller interval toward the stator (2). According to this specific configuration, the effect of converging the lines of magnetic force can be further enhanced, and as a result, the rotor (1) can be driven to rotate more efficiently.
【0012】[0012]
【発明の効果】本発明に係る永久磁石モータによれば、
永久磁石から発生する磁力線を有効に利用して大きな回
転トルクを発生させるため、駆動効率が従来よりも向上
する。According to the permanent magnet motor of the present invention,
Since a large rotational torque is generated by effectively utilizing the magnetic lines of force generated from the permanent magnets, the driving efficiency is improved as compared with the related art.
【0013】[0013]
【発明の実施の形態】以下、本発明の実施の形態につ
き、図面に沿って具体的に説明する。本実施例の永久磁
石モータは、図1及び図2に示す如く、円筒状の固定子
(2)の中央部に形成された空間に、円柱状の回転子(1)
が回転可能に収容されている。 本実施例の固定子(2)
は、図5に示す従来と全く同一であって、リング状の固
定子鉄芯(21)の内周面に、回転子(1)を包囲して、回転
子(1)の軸方向に貫通する24個のスロット(22a)(22b)
(22c)が等間隔に凹設されている。そして、これらのス
ロット(22a)(22b)(22c)に夫々、U相巻線(23)、V相巻
線(24)及びW相巻線(25)が巻き付けられている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. As shown in FIGS. 1 and 2, the permanent magnet motor of this embodiment has a cylindrical stator.
In the space formed in the center of (2), a cylindrical rotor (1)
Are rotatably accommodated. Stator of this embodiment (2)
Is exactly the same as the conventional one shown in FIG. 5, and surrounds the rotor (1) on the inner peripheral surface of the ring-shaped stator core (21) and penetrates in the axial direction of the rotor (1). 24 slots (22a) (22b)
(22c) are recessed at equal intervals. A U-phase winding (23), a V-phase winding (24), and a W-phase winding (25) are wound around these slots (22a), (22b), (22c), respectively.
【0014】一方、本実施例の回転子(1)は、1つの中
央部鉄芯(14)、4つの外周部鉄芯(15)(15)(15)(15)及び
両鉄芯(14)(15)を互いに連結する連結鉄芯(16)(16)(16)
(16)を具え、これらの鉄芯(14)(15)(16)は、薄板状の鉄
片(図示省略)を多数枚積層して形成されている。中央部
鉄芯(14)は、断面形状が正方形の軸部(14a)と、該軸部
(14a)の4つの角部から固定子(2)に向かって伸びる4
本のアーム部(14b)(14b)(14b)(14b)とから構成され、軸
部(14a)の中心部には、出力軸(3)が貫通して固定され
ている。又、軸部(14a)の外周面には、出力軸(3)を包
囲して、長方形の断面形状を有する4つの永久磁石(5)
(5)(5)(5)が固定されている。各永久磁石(5)は、径
方向に着磁され、隣り合う永久磁石(5)(5)の着磁方向
は、互いに逆となっている。On the other hand, the rotor (1) of this embodiment has one central iron core (14), four outer peripheral iron cores (15), (15), (15) (15), and both iron cores (14). (15) to each other (16) (16) (16)
(16), and these iron cores (14), (15), (16) are formed by laminating a large number of thin plate-shaped iron pieces (not shown). The central iron core (14) has a shaft section (14a) having a square cross section, and the shaft section.
4 extending from the four corners of (14a) toward the stator (2)
The output shaft (3) is fixed to the center of the shaft (14a) through the arm (14b) (14b) (14b) (14b). On the outer peripheral surface of the shaft portion (14a), four permanent magnets (5) having a rectangular cross-sectional shape surrounding the output shaft (3) are provided.
(5), (5) and (5) are fixed. Each permanent magnet (5) is magnetized in the radial direction, and the magnetizing directions of the adjacent permanent magnets (5) are opposite to each other.
【0015】外周部鉄芯(15)(15)(15)(15)は、扇形の断
面形状を有し、永久磁石(5)(5)(5)(5)の固定子(2)
側の表面に固定されている。隣り合う外周部鉄芯(15)(1
5)と中央部鉄芯(14)のアーム部(14b)は、連結鉄芯(16)
によって互いに連結され、各外周部鉄芯(15)と中央部鉄
芯(14)のアーム部(14b)との間には、外周部鉄芯(15)か
ら直接にアーム部(14b)へ至る漏洩磁束を減少させるた
めの空隙(12)が形成されている。The outer peripheral iron cores (15), (15), (15) and (15) each have a fan-shaped cross-sectional shape, and have a stator (2) for permanent magnets (5) (5) (5) (5).
Fixed on the side surface. Adjacent outer core (15) (1
5) and the arm part (14b) of the central iron core (14), the connecting iron core (16)
Between the outer peripheral iron core (15) and the arm part (14b) of the central iron core (14), and directly from the outer peripheral iron core (15) to the arm part (14b). An air gap (12) for reducing the leakage magnetic flux is formed.
【0016】そして外周部鉄芯(15)には、各永久磁石
(5)と固定子(2)に挟まれた領域に、回転子(1)の軸方
向に貫通する一対の貫通孔(13)(13)が開設され、各永久
磁石(5)と固定子(2)の間に発生する磁力線を外周部鉄
芯(15)の中央部に集束させるための低透磁率部を構成し
ている。一対の貫通孔(13)(13)は、各永久磁石(5)と固
定子(2)の間に発生する磁力線の磁気的中心線を挟んで
両側に対称に開設され、回転子(1)の出力軸(3)とは直
交する断面にて、夫々が細長いスリット形状を有すると
共に、固定子(2)に向かって互いの間隔が狭まってハの
字状を呈している。一対の貫通孔(13)(13)は、外周部鉄
芯(15)の他の領域に比べて透磁率が低いため、磁力線が
通り難い。従って、永久磁石(5)から発生した磁力線の
殆どが、図3に示す如く一対の貫通孔(13)(13)の間に集
束して外周部鉄芯(15)を通過し、巻線(23)(24)(25)に至
る。Each permanent magnet is attached to the outer peripheral iron core (15).
A pair of through holes (13) and (13) penetrating in the axial direction of the rotor (1) is formed in an area sandwiched between the stator (5) and the stator (2). A low magnetic permeability portion for converging the lines of magnetic force generated during (2) to the center of the outer peripheral iron core (15) is formed. The pair of through holes (13) and (13) are symmetrically opened on both sides with respect to the magnetic center line of the magnetic force generated between each permanent magnet (5) and the stator (2). In the cross section orthogonal to the output shaft (3), each has an elongated slit shape, and the interval between them decreases toward the stator (2), so that it has a C shape. Since the pair of through holes (13) and (13) have a lower magnetic permeability than other regions of the outer peripheral iron core (15), it is difficult for the magnetic force lines to pass through. Therefore, most of the magnetic lines of force generated from the permanent magnet (5) are converged between the pair of through holes (13) and (13) and pass through the outer peripheral iron core (15) as shown in FIG. 23), (24), and (25).
【0017】上記永久磁石モータにおいては、図示省略
する制御回路により、U相巻線(23)及びV相巻線(24)、
V相巻線(24)及びW相巻線(25)、W相巻線(25)及びU相
巻線(23)に順次、繰り返し通電する。例えば図3におい
て、W相巻線(25)及びU相巻線(23)が通電されている状
態では、図示の如き磁力線分布が形成され、W相巻線(2
5)及びU相巻線(23)に、これらの巻線(23)(25)を貫通す
る磁力線との関係でフレミングの左手の法則に基づく電
磁力が生じる。ここで、永久磁石(5)から発生した磁力
線の殆どが、図示の如くW相巻線(25)及びU相巻線(23)
を貫通するので、図6に示す如く磁力線がU相巻線(2
3)、V相巻線(24)及びW相巻線(25)に分散して貫通して
いた従来よりも大きな電磁力が得られる。この大きな電
磁力によって、回転子(1)に大きな回転トルクが発生す
る。同様に、他の3つの永久磁石(5)(5)(5)と、これ
らの永久磁石(5)(5)(5)が対向するW相巻線(25)及び
U相巻線(23)との関係においても、大きな電磁力が得ら
れ、回転子(1)に大きな回転トルクが発生する。これら
の回転トルクが合成されて、回転子(1)が回転駆動され
る。In the permanent magnet motor, a U-phase winding (23) and a V-phase winding (24),
The V-phase winding (24) and the W-phase winding (25), the W-phase winding (25) and the U-phase winding (23) are sequentially and repeatedly energized. For example, in FIG. 3, when the W-phase winding (25) and the U-phase winding (23) are energized, a magnetic field line distribution as shown is formed, and the W-phase winding (2
An electromagnetic force based on Fleming's left hand rule is generated in the 5) and U-phase windings (23) in relation to the lines of magnetic force passing through these windings (23) and (25). Here, most of the magnetic lines of force generated from the permanent magnet (5) are, as shown, a W-phase winding (25) and a U-phase winding (23).
Through the U-phase winding (2) as shown in FIG.
3) It is possible to obtain an electromagnetic force larger than before, which is distributed and penetrates the V-phase winding (24) and the W-phase winding (25). Due to this large electromagnetic force, a large rotational torque is generated in the rotor (1). Similarly, the other three permanent magnets (5), (5), (5), and the W-phase winding (25) and the U-phase winding (23) opposed by the permanent magnets (5), (5), (5). With respect to the relationship (1), a large electromagnetic force is obtained, and a large rotational torque is generated in the rotor (1). These rotation torques are combined to rotate the rotor (1).
【0018】次に、W相巻線(25)及びU相巻線(23)に対
する通電からU相巻線(23)及びV相巻線(24)に対する通
電に切り替わると、この時点で各永久磁石(5)は、これ
ら通電中のU相巻線(23)及びV相巻線(24)に対向するこ
とになる。これによって、上述のW相巻線(25)及びU相
巻線(23)との関係と同様に、永久磁石(5)から発生した
磁力線の殆どが、U相巻線(23)及びV相巻線(24)を貫通
して、大きな回転トルクが発生する。この様にして、隣
り合う2相の巻線に順次通電を行なうことによって、大
きな回転トルクが連続的に発生し、回転子(1)の回転が
持続するのである。Next, when the energization of the W-phase winding (25) and the U-phase winding (23) is switched to the energization of the U-phase winding (23) and the V-phase winding (24), each permanent The magnet (5) faces the energized U-phase winding (23) and V-phase winding (24). Thereby, similar to the relationship between the W-phase winding (25) and the U-phase winding (23), most of the magnetic force lines generated from the permanent magnet (5) are changed to the U-phase winding (23) and the V-phase winding. A large rotating torque is generated through the winding (24). In this manner, by sequentially energizing the adjacent two-phase windings, a large rotating torque is continuously generated, and the rotation of the rotor (1) is continued.
【0019】図4は、上記永久磁石モータにおいて、永
久磁石から発生する磁力線の分布との関係で、大きな回
転トルクが得られる様子を表わしている。同図(a)は、
電気角360度の範囲において永久磁石から発生する磁
力線の分布、同図(b)は1相の巻線を流れる電流の波
形、同図(c)は該巻線に電流が流れることによって回転
子に発生する回転トルクの波形、同図(d)は3相の巻線
に電流が流れることによって回転子に発生する総合の回
転トルクの波形を表わしている。FIG. 4 shows how a large rotating torque can be obtained in the above-described permanent magnet motor in relation to the distribution of lines of magnetic force generated from the permanent magnet. FIG.
The distribution of the lines of magnetic force generated from the permanent magnet in the range of the electrical angle of 360 degrees, FIG. 3B shows the waveform of the current flowing through the one-phase winding, and FIG. (D) shows the waveform of the total rotation torque generated in the rotor due to the current flowing through the three-phase windings.
【0020】従来の永久磁石モータにおいては、永久磁
石(5)から発生した磁力線は放射状に拡がるため、磁力
線の分布は、同図(a)に破線で示す如く、同図(b)に示
す通電区間(電気角120度)よりも両側に拡がった台形
状の分布となっており、通電区間の両側に拡がる磁力線
は、通電されていない巻線を貫通するため、回転トルク
を生じず、漏洩磁束となっていた。これに対し、本発明
の永久磁石モータにおいては、上述の如く、永久磁石か
ら発生した磁力線が一対の貫通孔によって集束されるた
め、磁力線の分布は、同図(a)に実線で示す如く、同図
(b)に示す通電区間に圧縮された分布となり、通電区間
の両側に拡がる漏洩磁束は従来よりも大幅に減少する。
この結果、永久磁石から発生する磁力線の大部分が通電
中の巻線を貫通することとなって、同図(c)に実線で示
す如く、破線で示す従来の回転トルクよりも大きな回転
トルクが得られる。In the conventional permanent magnet motor, the lines of magnetic force generated from the permanent magnet (5) spread radially, and the distribution of the lines of magnetic force is as shown by the broken line in FIG. It has a trapezoidal distribution that spreads to both sides of the section (electrical angle 120 degrees), and the magnetic lines of force that spread to both sides of the energized section penetrate the windings that are not energized, so there is no rotational torque, and the leakage flux Had become. On the other hand, in the permanent magnet motor of the present invention, as described above, the lines of magnetic force generated from the permanent magnets are converged by the pair of through holes, and the distribution of the lines of magnetic force is as shown by the solid line in FIG. Same figure
The distribution is compressed in the current-carrying section shown in (b), and the leakage magnetic flux spreading on both sides of the current-carrying section is significantly reduced as compared with the conventional case.
As a result, most of the magnetic force lines generated from the permanent magnets penetrate through the current-carrying winding, and as shown by the solid line in FIG. can get.
【0021】同図(c)に示す回転トルクは、3相の巻線
の夫々について発生し、これらの回転トルクは電気角6
0度の位相差を有するため、これらの回転トルクが合計
された総合の回転トルクは、同図(d)に実線で示す如く
平坦な分布となり、破線で示す従来の総合の回転トルク
よりも大きくなる。この様に、本発明の永久磁石モータ
においては、永久磁石(5)から発生した磁力線が有効に
巻線に作用して、回転子(1)に大きな回転トルクが発生
するので、従来よりも駆動効率が向上する。The rotation torque shown in FIG. 3C is generated for each of the three-phase windings, and these rotation torques
Since there is a phase difference of 0 degrees, the total rotational torque obtained by summing these rotational torques has a flat distribution as shown by the solid line in FIG. 4D, and is larger than the conventional total rotational torque shown by the broken line. Become. As described above, in the permanent magnet motor of the present invention, the lines of magnetic force generated from the permanent magnets (5) effectively act on the windings to generate a large rotational torque on the rotor (1). Efficiency is improved.
【0022】尚、本発明の各部構成は上記実施の形態に
限らず、特許請求の範囲に記載の技術的範囲内で種々の
変形が可能である。例えば、上記実施の形態において
は、本発明を3相の巻線(23)(24)(25)を具えた永久磁石
モータに実施しているが、これに限らず、2相或いは4
相以上の複数相の巻線を具えた永久磁石モータにも実施
可能である。又、上記実施の形態においては、本発明を
4個の永久磁石(5)(5)(5)(5)を具えた永久磁石モー
タに実施しているが、これに限らず、1個或いは4個以
外の複数個の永久磁石を具えた永久磁石モータにも実施
可能である。The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, in the above embodiment, the present invention is applied to the permanent magnet motor having the three-phase windings (23), (24), (25), but is not limited thereto.
The present invention is also applicable to a permanent magnet motor having windings of a plurality of phases or more. Further, in the above-described embodiment, the present invention is applied to the permanent magnet motor including four permanent magnets (5), (5), (5), and (5). The present invention is also applicable to a permanent magnet motor having a plurality of permanent magnets other than four.
【図1】本発明の永久磁石モータの構造を表わす断面図
である。FIG. 1 is a cross-sectional view illustrating a structure of a permanent magnet motor of the present invention.
【図2】同上の構造を表わす斜視図である。FIG. 2 is a perspective view showing the structure of the above.
【図3】図1において、永久磁石から発生する磁力線の
分布を表わす図である。FIG. 3 is a diagram showing a distribution of lines of magnetic force generated from a permanent magnet in FIG.
【図4】永久磁石から発生する磁力線の分布と、これに
よって得られる回転トルクを、本発明と従来で比較した
波形図である。FIG. 4 is a waveform diagram comparing the distribution of lines of magnetic force generated from a permanent magnet and the rotational torque obtained thereby with the present invention and the related art.
【図5】従来の永久磁石モータの構造を表わす断面図で
ある。FIG. 5 is a cross-sectional view illustrating a structure of a conventional permanent magnet motor.
【図6】図5において、永久磁石から発生する磁力線の
分布を表わす図である。FIG. 6 is a diagram showing a distribution of lines of magnetic force generated from permanent magnets in FIG. 5;
(1) 回転子 (12) 空隙 (13) 貫通孔 (14) 中央部鉄芯 (15) 外周部鉄芯 (16) 連結鉄芯 (2) 固定子 (21) 固定子鉄芯 (22a) U相スロット (22b) V相スロット (22c) W相スロット (23) U相巻線 (24) V相巻線 (25) W相巻線 (1) Rotor (12) Air gap (13) Through hole (14) Central iron core (15) Outer peripheral iron core (16) Connecting iron core (2) Stator (21) Stator iron core (22a) U Phase slot (22b) V phase slot (22c) W phase slot (23) U phase winding (24) V phase winding (25) W phase winding
Claims (4)
ると共に永久磁石(5)の固定子(2)側に外周部鉄芯(15)
が配設された永久磁石モータにおいて、外周部鉄芯(15)
には、永久磁石(5)と固定子(2)の間に発生する磁力線
を外周部鉄芯(15)の中央部に集束させるための低透磁率
部が形成されている永久磁石モータ。A permanent magnet (5) is disposed on a rotor (1), and an outer peripheral iron core (15) is provided on a stator (2) side of the permanent magnet (5).
In the permanent magnet motor provided with, the outer peripheral iron core (15)
, A permanent magnet motor in which a low magnetic permeability portion for forming a magnetic flux generated between a permanent magnet (5) and a stator (2) at a central portion of an outer peripheral iron core (15) is formed.
回転子(1)を回転可能に収容して構成され、固定子(2)
には、回転子(1)を包囲する複数位置に、回転子(1)の
回転軸と平行に伸びる複数相の巻線が配設される一方、
回転子(1)には、回転軸を包囲する複数位置に、回転軸
とは直交する径方向に着磁された複数の永久磁石(5)が
配設されると共に、各永久磁石(5)の固定子(2)側の表
面に接触させて複数の外周部鉄芯(15)が配設され、前記
複数相の巻線に順次通電することによって、回転子(1)
を回転させる永久磁石モータにおいて、各外周部鉄芯(1
5)には、各永久磁石(5)と固定子(2)に挟まれた領域
に、各永久磁石(5)と固定子(2)の間に発生する磁力線
を外周部鉄芯(15)の中央部に集束させるための低透磁率
部が形成されている永久磁石モータ。2. A stator (2) comprising a rotor (1) rotatably housed in a space formed at the center of the stator (2).
, A plurality of phase windings extending parallel to the rotation axis of the rotor (1) are disposed at a plurality of positions surrounding the rotor (1).
The rotor (1) is provided with a plurality of permanent magnets (5) magnetized in a radial direction orthogonal to the rotation axis at a plurality of positions surrounding the rotation axis, and each permanent magnet (5). A plurality of outer peripheral iron cores (15) are disposed in contact with the surface of the stator (2) side of the rotor (1).
In the permanent magnet motor that rotates
In the area between the permanent magnets (5) and the stator (2), the lines of magnetic force generated between the permanent magnets (5) and the stator (2) are applied to the outer core (15). Permanent magnet motor having a low magnetic permeability portion for focusing at the center of the motor.
子(1)の軸方向に貫通して開設された一対の貫通孔(13)
(13)から構成され、該一対の貫通孔(13)(13)は、各永久
磁石(5)と固定子(2)の間に発生する磁力線の磁気的中
心線を挟んで両側に配置されている請求項1又は請求項
2に記載の永久磁石モータ。3. The low magnetic permeability part comprises a pair of through holes (13) formed by penetrating each outer peripheral iron core (15) in the axial direction of the rotor (1).
(13), and the pair of through-holes (13) and (13) are arranged on both sides of a magnetic center line of magnetic force lines generated between each of the permanent magnets (5) and the stator (2). The permanent magnet motor according to claim 1 or 2, wherein
(1)の回転軸とは直交する断面にて、夫々が細長いスリ
ット形状を有すると共に、固定子(2)に向かって互いの
間隔が狭まっている請求項3に記載の永久磁石モータ。4. The pair of through holes (13) (13) are
4. The permanent magnet motor according to claim 3, wherein each of the cross sections perpendicular to the rotation axis of (1) has an elongated slit shape, and a distance between the sections decreases toward the stator (2). 5.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9199925A JPH1146464A (en) | 1997-07-25 | 1997-07-25 | Permanent magnet motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9199925A JPH1146464A (en) | 1997-07-25 | 1997-07-25 | Permanent magnet motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1146464A true JPH1146464A (en) | 1999-02-16 |
Family
ID=16415884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9199925A Pending JPH1146464A (en) | 1997-07-25 | 1997-07-25 | Permanent magnet motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1146464A (en) |
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US7667363B2 (en) | 2006-04-20 | 2010-02-23 | Kabushiki Kaisha Toyota Jidoshokki | Permanent magnet embedment rotating electric machine, motor for car air conditioner, and enclosed electric compressor |
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US6704783B1 (en) | 1999-10-28 | 2004-03-09 | Fujitsu Limited | Reference state output system, reference state output method, and computer readable medium on which reference state output program is recorded |
EP1248348A1 (en) * | 2001-04-05 | 2002-10-09 | Hitachi, Ltd. | Permanent magnet type rotating electrical machine, and power generation system and drive system using it |
US6657350B2 (en) | 2001-04-05 | 2003-12-02 | Hitachi, Ltd. | Permanent magnet type rotating electrical machine, and power generation system and drive system using it |
US6717314B2 (en) | 2002-08-28 | 2004-04-06 | Emerson Electric Co. | Interior permanent magnet motor for use in washing machines |
US6727623B2 (en) * | 2002-08-28 | 2004-04-27 | Emerson Electric Co. | Reduced impedance interior permanent magnet machine |
US6891298B2 (en) | 2002-08-28 | 2005-05-10 | Emerson Electric Co. | Interior permanent magnet machine with reduced magnet chattering |
US6946766B2 (en) | 2002-08-28 | 2005-09-20 | Emerson Electric Co. | Permanent magnet machine |
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US7327062B2 (en) * | 2003-12-08 | 2008-02-05 | Nissan Motor Co., Ltd. | Rotor for rotary electric machine |
JP2006211823A (en) * | 2005-01-28 | 2006-08-10 | Hitachi Industrial Equipment Systems Co Ltd | Permanent magnet type rotary electric machine and compressor using the same |
US7705502B2 (en) | 2006-04-14 | 2010-04-27 | Emerson Electric Co. | Interior magnet machine with non-perpendicular slots |
US8350435B2 (en) | 2006-04-14 | 2013-01-08 | Emerson Electric Co. | Interior magnet machine with reduced cogging |
US7667363B2 (en) | 2006-04-20 | 2010-02-23 | Kabushiki Kaisha Toyota Jidoshokki | Permanent magnet embedment rotating electric machine, motor for car air conditioner, and enclosed electric compressor |
JP2008187778A (en) * | 2007-01-29 | 2008-08-14 | Mitsubishi Electric Corp | Rotator for permanent magnet embedded motor, blower, and compressor |
JP2010200387A (en) * | 2009-02-21 | 2010-09-09 | Mitsubishi Electric Corp | Electric motor, blower and compressor |
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