JP2020014322A - Rotor of rotary electric machine and rotary electric machine - Google Patents

Rotor of rotary electric machine and rotary electric machine Download PDF

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JP2020014322A
JP2020014322A JP2018134955A JP2018134955A JP2020014322A JP 2020014322 A JP2020014322 A JP 2020014322A JP 2018134955 A JP2018134955 A JP 2018134955A JP 2018134955 A JP2018134955 A JP 2018134955A JP 2020014322 A JP2020014322 A JP 2020014322A
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rotor
electric machine
rotating electric
laminated steel
magnet
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裕司 辻
Yuji Tsuji
裕司 辻
金澤　宏至
Hiroshi Kanazawa
宏至 金澤
大祐 郡
Daisuke Koori
大祐 郡
貴行 近岡
Takayuki Chikaoka
貴行 近岡
一農 田子
Kazuatsu Tago
一農 田子
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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Priority to JP2018134955A priority Critical patent/JP2020014322A/en
Priority to PCT/JP2019/025301 priority patent/WO2020017262A1/en
Publication of JP2020014322A publication Critical patent/JP2020014322A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

To solve a problem that a leakage magnetic flux occurs due to provision of a magnet positioning projection or an outer peripheral bridge on a lamination steel plate which is a component of a rotor and a torque ripple cannot be sufficiently reduced.SOLUTION: A first lamination steel plate 51 includes an inner peripheral bridge 13 holding a pole piece part 17 on an inner peripheral side of a rotor 3. Of the side surfaces of a permanent magnet 5 along a magnetization direction 15 of the permanent magnet 5, a side surface 5b on an outer peripheral side of the rotor 3 is not brought into contact with the first lamination steel plate 51, and a magnet housing part 9 communicates with an air gap 12 formed between the rotor 3 and a stator 1. That is, a leakage magnetic flux can be sufficiently reduced because there is neither a positioning projection of the permanent magnet 5 nor an outer peripheral bridge on the side surface 5b on the outer peripheral side of the permanent magnet 5.SELECTED DRAWING: Figure 3

Description

本発明は、回転電機のロータおよび回転電機に関する。   The present invention relates to a rotor of a rotating electric machine and a rotating electric machine.

埋め込み永久磁石型回転電機は、永久磁石の飛び出し防止のため、永久磁石の磁石収納部の外周側には外周ブリッジや磁石位置決め用の突起が設けられている。そのため、外周ブリッジや磁石位置決め用の突起への漏れ磁束により、回転電機のトルク低下やトルクリプルが増加する。例えば、電動パワーステアリング装置（以下、ＥＰＳ装置）に使用される回転電機では、回転電機のトルク変動が車室内の騒音や振動の原因となり、乗り心地を悪化させる。回転電機に設けられた外周ブリッジや磁石位置決め突起への漏れ磁束によるトルクリプルの低減技術としては、例えば、特許文献１に記載のように、漏れ磁束の大きい外周ブリッジを有する積層鋼板と漏れ磁束の小さい中央ブリッジを有する積層鋼板とを１枚ずつ、又は数枚単位で交互に積層する技術がある。また、特許文献２に記載のように、外周ブリッジが一部存在しない積層鋼板をロータの回転軸を中心に所定角度回転した状態で積層する技術がある。また、特許文献３に記載のように、磁石位置決め突起のない積層鋼板を積層する技術がある。   The embedded permanent magnet type rotating electric machine is provided with an outer peripheral bridge and a magnet positioning protrusion on the outer peripheral side of the permanent magnet storage portion in order to prevent the permanent magnet from jumping out. Therefore, the magnetic flux leaking to the outer peripheral bridge and the magnet positioning projection causes a decrease in torque and an increase in torque ripple of the rotating electric machine. For example, in a rotating electric machine used in an electric power steering device (hereinafter, referred to as an EPS device), fluctuations in torque of the rotating electric machine cause noise and vibration in a vehicle cabin, thereby deteriorating ride comfort. As a technique for reducing torque ripple due to a magnetic flux leaking to an outer peripheral bridge or a magnet positioning protrusion provided in a rotating electric machine, for example, as described in Patent Document 1, a laminated steel sheet having an outer peripheral bridge having a large leakage magnetic flux and a laminated steel sheet having a small leakage magnetic flux are disclosed. There is a technique in which laminated steel sheets having a central bridge are alternately laminated one by one or in units of several sheets. Further, as described in Patent Document 2, there is a technique of laminating laminated steel sheets having a part of an outer peripheral bridge that is not rotated and rotated by a predetermined angle about a rotation axis of a rotor. Further, as described in Patent Document 3, there is a technique of laminating laminated steel sheets without magnet positioning projections.

特開２０１１−４４８０号公報JP 2011-4480 A 特開２００６−５０８２０号公報JP-A-2006-50820 特開２０１６−４６９４９号公報JP 2016-46949 A

特許文献１および特許文献２では、全ての積層鋼板の磁石収納部の外周側の位置に、磁石位置決めの突起が設けられている。また、外周ブリッジが無い積層鋼板においても、替わりに磁石位置決め突起への漏れ磁束が増加するため、トルクリプルを十分低減できない。特許文献３においては、磁石位置決め突起のない積層鋼板を積層しているが、全ての積層鋼板に外周ブリッジが設けられているため、漏れ磁束が発生し、トルクリプルを十分低減できない。   In Patent Literature 1 and Patent Literature 2, protrusions for magnet positioning are provided at positions on the outer peripheral side of the magnet housing portions of all the laminated steel plates. Further, even in a laminated steel sheet without an outer peripheral bridge, the leakage magnetic flux to the magnet positioning protrusion increases instead, so that the torque ripple cannot be sufficiently reduced. In Patent Literature 3, laminated steel sheets without magnet positioning protrusions are laminated, but since all the laminated steel sheets are provided with an outer peripheral bridge, leakage magnetic flux is generated and torque ripple cannot be sufficiently reduced.

本発明の第１の態様によると、複数枚の積層鋼板により構成され複数の磁石収納部を設けたロータコアと、前記複数の磁石収納部にそれぞれ収納されて磁極を形成する複数の永久磁石とを備えた回転電機のロータにおいて、前記複数枚の積層鋼板は、前記ロータの外周側であって前記磁石収納部で区分された複数のポールピース部を備え、前記複数枚の積層鋼板のうち、少なくとも１枚の第１積層鋼板は、前記ポールピース部を前記ロータの内周側で保持する内周ブリッジを備え、前記永久磁石の磁化方向に沿う前記永久磁石の側面のうち前記ロータの外周側の側面は前記第１積層鋼板と接触せず、前記磁石収納部が前記ロータとステータとの間に形成されるエアギャップに連通する。
本発明の第２の態様によると、複数枚の積層鋼板により構成され複数の磁石収納部を設けたロータコアと、前記複数の磁石収納部にそれぞれ収納されて磁極を形成する複数の永久磁石とを備えた回転電機のロータにおいて、前記複数枚の積層鋼板のうち、少なくとも１枚は、前記永久磁石の磁化方向に沿う永久磁石の側面のうち前記ロータの内周側の側面を拘束する内周ブリッジを有する第１磁石収納部、および前記永久磁石の側面のうち前記ロータの外周側の側面を拘束する外周ブリッジを有する第２磁石収納部を備える。 According to the first aspect of the present invention, a rotor core constituted by a plurality of laminated steel sheets and provided with a plurality of magnet housing portions, and a plurality of permanent magnets housed in the plurality of magnet housing portions to form magnetic poles, respectively. In the rotor of the rotating electrical machine provided, the plurality of laminated steel sheets includes a plurality of pole piece portions that are separated by the magnet housing portion on the outer peripheral side of the rotor, and at least one of the plurality of laminated steel sheets. One first laminated steel sheet includes an inner circumferential bridge that holds the pole piece portion on the inner circumferential side of the rotor, and includes a side surface of the permanent magnet along a magnetization direction of the permanent magnet on an outer circumferential side of the rotor. The side surface does not contact the first laminated steel sheet, and the magnet housing communicates with an air gap formed between the rotor and the stator.
According to the second aspect of the present invention, a rotor core constituted by a plurality of laminated steel sheets and provided with a plurality of magnet housing portions, and a plurality of permanent magnets housed in the plurality of magnet housing portions to form magnetic poles, respectively. In the rotating electric machine rotor provided, at least one of the plurality of laminated steel plates has an inner peripheral bridge that restrains an inner peripheral side surface of the rotor among side surfaces of the permanent magnet along a magnetization direction of the permanent magnet. And a second magnet storage portion having an outer peripheral bridge that restrains the outer peripheral side surface of the rotor among the side surfaces of the permanent magnet.

本発明によれば、ロータコアを形成する積層鋼板からの漏れ磁束を低減することで、回転電機の低トルクリプル化、高トルク化を実現できる。   ADVANTAGE OF THE INVENTION According to this invention, low torque ripple and high torque of a rotary electric machine can be implement | achieved by reducing the leakage magnetic flux from the laminated steel plate which forms a rotor core.

第１の実施形態に係る回転電機の軸方向断面図である。FIG. 2 is an axial sectional view of the rotating electric machine according to the first embodiment. Ａ−Ａ断面におけるステータ及びロータの径方向断面図である。It is a radial sectional view of a stator and a rotor in AA section. 第１積層鋼板の１磁極分を拡大して示す拡大図である。It is an enlarged view which expands and shows one magnetic pole of a 1st laminated steel sheet. Ｂ−Ｂ断面におけるステータ及びロータの径方向断面図である。It is a radial cross-sectional view of a stator and a rotor in a BB cross section. 第２積層鋼板の１磁極分を拡大して示す拡大図である。It is an enlarged view which expands and shows one magnetic pole of a 2nd laminated steel plate. 変形例１に係るロータの軸方向断面図を示す。7 shows an axial cross-sectional view of a rotor according to Modification 1. FIG. 変形例２に係る第１積層鋼板の１磁極分を拡大して示す拡大図である。FIG. 10 is an enlarged view showing one magnetic pole of a first laminated steel sheet according to Modification Example 2 in an enlarged manner. 変形例２に係る第２積層鋼板の１磁極分を拡大して示す拡大図である。It is an enlarged view which expands and shows one magnetic pole of the 2nd laminated steel sheet according to the modification 2. 変形例３に係る第１積層鋼板の１磁極分を拡大して示す拡大図である。FIG. 13 is an enlarged view showing one magnetic pole of a first laminated steel sheet according to Modification Example 3 in an enlarged manner. 変形例３の他の例に係る第１積層鋼板の１磁極分を拡大して示す拡大図である。FIG. 13 is an enlarged view showing one magnetic pole of a first laminated steel sheet according to another example of Modification Example 3 in an enlarged manner. 第２の実施形態に係るステータ及びロータの径方向断面図である。FIG. 6 is a radial cross-sectional view of a stator and a rotor according to a second embodiment. 第２の実施形態に係る第３積層鋼板の１磁極分を拡大して示す拡大図である。It is an enlarged drawing which expands and shows one magnetic pole of the 3rd laminated steel sheet concerning a 2nd embodiment. 第２の実施形態の変形例に係る第３積層鋼板の１磁極分を拡大して示す拡大図である。It is an enlarged view which expands and shows one magnetic pole of the 3rd laminated steel sheet which concerns on the modification of 2nd Embodiment. 第３の実施形態に係るステータ及びロータの径方向断面図である。FIG. 14 is a radial cross-sectional view of a stator and a rotor according to a third embodiment. 第３の実施形態に係るロータの径方向断面の１磁極分を拡大して示す拡大図である。FIG. 11 is an enlarged view showing one magnetic pole in a radial cross section of a rotor according to a third embodiment. 第４の実施形態に係るロータの径方向断面の１磁極分を拡大して示す拡大図である。It is an enlarged drawing which expands and shows one magnetic pole of the radial cross section of the rotor which concerns on 4th Embodiment. 第４の実施形態に係るロータの径方向断面の１磁極分を拡大して示す拡大図である。It is an enlarged drawing which expands and shows one magnetic pole of the radial cross section of the rotor which concerns on 4th Embodiment. 第４の実施形態に係るロータの径方向断面の１磁極分を拡大して示す拡大図である。It is an enlarged drawing which expands and shows one magnetic pole of the radial cross section of the rotor which concerns on 4th Embodiment. 第５の実施形態に係るスポーク式埋め込み磁石型回転電機のロータの径方向断面図である。It is a radial cross-sectional view of the rotor of the spoke type embedded magnet type rotating electric machine according to the fifth embodiment. 第５の実施形態に係るスポーク式埋め込み磁石型回転電機のロータの径方向断面図である。It is a radial cross-sectional view of the rotor of the spoke type embedded magnet type rotating electric machine according to the fifth embodiment. 第５の実施形態に係るスポーク式埋め込み磁石型回転電機のロータの径方向断面図である。It is a radial cross-sectional view of the rotor of the spoke type embedded magnet type rotating electric machine according to the fifth embodiment. 第６の実施形態に係るコンシクエントポール式回転電機のロータの径方向断面図を示す。FIG. 13 shows a radial cross-sectional view of a rotor of a consequent pole type rotating electric machine according to a sixth embodiment. 第６の実施形態に係るコンシクエントポール式回転電機のロータの径方向断面図を示す。FIG. 13 shows a radial cross-sectional view of a rotor of a consequent pole type rotating electric machine according to a sixth embodiment. 第６の実施形態に係るコンシクエントポール式回転電機のロータの径方向断面図を示す。FIG. 13 shows a radial cross-sectional view of a rotor of a consequent pole type rotating electric machine according to a sixth embodiment. 第７の実施形態に係る回転電機の駆動システムの構成を示す図である。It is a figure showing composition of a drive system of a rotary electric machine concerning a 7th embodiment. 第８の実施形態に係るＥＰＳ装置を示した図である。It is a figure showing the EPS device concerning an 8th embodiment. 本実施形態と比較例とのトルク、トルクリプル、コギングトルクの比を示す図である。It is a figure which shows the ratio of torque, torque ripple, and cogging torque of this embodiment and a comparative example.

以下、図面を参照して本発明の一実施形態に係る回転電機１００について説明する。なお、以下の実施形態における回転電機１００は、電動パワーステアリング装置をはじめ、電動ブレーキ装置など、その他の自動車用電動補機装置の回転電機１００へも適用可能である。さらには、産業用の回転電機１００全般にも適用可能である。なお、各図において同一構成には同一の符号を記し、重複する説明は省略する。   Hereinafter, a rotating electric machine 100 according to an embodiment of the present invention will be described with reference to the drawings. The rotating electric machine 100 in the following embodiments can be applied to the rotating electric machine 100 of other electric auxiliaries for automobiles such as an electric power steering device and an electric brake device. Further, the present invention can be applied to general industrial rotary electric machines 100. In each of the drawings, the same components are denoted by the same reference numerals, and redundant description will be omitted.

［第１の実施形態］
図１〜図１０を参照して、第１の実施形態である回転電機１００の構成を説明する。図１は、本実施形態に係る回転電機１００の軸方向断面図である。本実施形態の回転電機１００は、ステータ１と、ステータ１内に、エアギャップ１２を介して、回転可能に配置されたロータ３と、駆動軸７と、ステータ１を保持するフレーム８とを備える。ステータ１は、ステータコア２と、ステータコア２のティース１１（図２参照）に巻回されるコイル１０（図２参照）と、コイル１０のコイルエンド部６とを有する。ロータ３は、複数枚の積層鋼板から構成されたロータコア４と、ロータコア４の磁石収納部９に収納された複数の永久磁石５を備える。 [First Embodiment]
The configuration of the rotating electric machine 100 according to the first embodiment will be described with reference to FIGS. FIG. 1 is an axial sectional view of a rotating electric machine 100 according to the present embodiment. The rotating electric machine 100 according to the present embodiment includes a stator 1, a rotor 3 rotatably disposed in the stator 1 via an air gap 12, a drive shaft 7, and a frame 8 holding the stator 1. . Stator 1 has stator core 2, coil 10 (see FIG. 2) wound around teeth 11 (see FIG. 2) of stator core 2, and coil end portion 6 of coil 10. The rotor 3 includes a rotor core 4 composed of a plurality of laminated steel plates and a plurality of permanent magnets 5 stored in a magnet storage section 9 of the rotor core 4.

図２は、図１のＡ−Ａ断面におけるステータ１及びロータ３の径方向断面図である。ティース１１にコイル１０が巻き回される。ロータ３のこの断面における第１積層鋼板５１は、Ｖ字状の磁石収納部９を設けたロータコア４と、Ｖ字状の磁石収納部９にＶ字状に配置されて１つの磁極を形成する複数（図２では２つ）の永久磁石５を備え、永久磁石５の内周側の磁極中央付近には、内周ブリッジ１３を有する。   FIG. 2 is a radial cross-sectional view of the stator 1 and the rotor 3 in the AA cross section of FIG. The coil 10 is wound around the teeth 11. The first laminated steel sheet 51 in this cross section of the rotor 3 is arranged in the V-shaped magnet housing 9 with the rotor core 4 provided with the V-shaped magnet housing 9 and forms one magnetic pole. A plurality of (two in FIG. 2) permanent magnets 5 are provided, and an inner peripheral bridge 13 is provided near the center of the magnetic pole on the inner peripheral side of the permanent magnet 5.

図３は、図２の破線２Ａで囲ったロータ３の１磁極分の磁極付近の拡大図であり、第１積層鋼板５１を示す。この第１積層鋼板５１は、Ｖ字状の磁石収納部９で区分されたポールピース部１７を有する。また、このポールピース部１７をロータの内周側で保持する内周ブリッジ１３を有する。内周ブリッジ１３は、永久磁石５の磁化方向１５に沿う永久磁石５の側面のうちロータ３の内周側の側面５ａを拘束する機能も有する。永久磁石５の磁化方向１５に沿う永久磁石５の側面のうちロータ３の外周側の側面５ｂは第１積層鋼板５１と接触せず、磁石収納部９はステータ１との間に形成されるエアギャップ１２に凹部１８を介して連通する。すなわち、永久磁石５の外周側の側面５ｂには、永久磁石５の位置決め突起と外周ブリッジとの両者が無いため、漏れ磁束を十分低減することができる。   FIG. 3 is an enlarged view of the vicinity of one magnetic pole of the rotor 3 surrounded by a broken line 2A in FIG. The first laminated steel sheet 51 has a pole piece portion 17 divided by a V-shaped magnet storage portion 9. Further, there is provided an inner peripheral bridge 13 for holding the pole piece portion 17 on the inner peripheral side of the rotor. The inner peripheral bridge 13 also has a function of restricting the inner peripheral side surface 5 a of the rotor 3 among the side surfaces of the permanent magnet 5 along the magnetization direction 15 of the permanent magnet 5. Of the side surfaces of the permanent magnet 5 along the magnetization direction 15 of the permanent magnet 5, the side surface 5 b on the outer peripheral side of the rotor 3 does not contact the first laminated steel sheet 51, and the magnet housing portion 9 is formed by air formed between the permanent magnet 5 and the stator 1. It communicates with the gap 12 via the recess 18. That is, since neither the positioning protrusion of the permanent magnet 5 nor the outer peripheral bridge is provided on the outer peripheral side surface 5b of the permanent magnet 5, the leakage magnetic flux can be sufficiently reduced.

第１積層鋼板５１は、Ｖ字状の磁石収納部９で区分され、内周ブリッジ１３で保持されるポールピース部１７を有する。回転電機１００の回転時において、ポールピース部１７には自身と永久磁石５の遠心力が作用する。そのため、内周ブリッジ１３は外周ブリッジ（後述する図５の外周ブリッジ１４参照）の替わりに、ポールピース部１７を支持する。ここで、外周ブリッジと内周ブリッジ１３の機械的、磁気的な特徴について述べる。ポールピース部１７に作用する遠心力に対し、外周ブリッジにかかる応力は曲げ応力であり、内周ブリッジ１３にかかる力は引っ張り応力と近似できる。材料力学の一般論として、曲げ応力より引っ張り応力のほうが、同じ力（ここではポールピース部１７に作用する遠心力）に対する応力が小さい。そのため、外周ブリッジよりも内周ブリッジ１３の方が機械強度が優れ、内周ブリッジ１３の幅を細くすることができる。また、外周ブリッジ１つ当たりには、永久磁石５の１つ分の磁束が通るのに対し、内周ブリッジ１３の１つ当たりには、永久磁石５の２つ分の磁束が通ることになる。その結果、外周ブリッジの幅と内周ブリッジ１３の幅が同じと仮定すると、単純に内周ブリッジ１３の磁気抵抗は外周ブリッジの２倍となり、内周ブリッジ１３の方が漏れ磁束が小さくなる。   The first laminated steel plate 51 has a pole piece portion 17 which is divided by the V-shaped magnet storage portion 9 and held by the inner peripheral bridge 13. When the rotating electric machine 100 rotates, the centrifugal force of itself and the permanent magnet 5 acts on the pole piece portion 17. Therefore, the inner peripheral bridge 13 supports the pole piece portion 17 instead of the outer peripheral bridge (see the outer peripheral bridge 14 in FIG. 5 described later). Here, mechanical and magnetic characteristics of the outer bridge and the inner bridge 13 will be described. With respect to the centrifugal force acting on the pole piece portion 17, the stress applied to the outer peripheral bridge is a bending stress, and the force applied to the inner peripheral bridge 13 can be approximated to a tensile stress. As a general theory of material mechanics, the tensile stress is smaller than the bending stress with respect to the same force (here, the centrifugal force acting on the pole piece 17). Therefore, the inner bridge 13 has better mechanical strength than the outer bridge, and the width of the inner bridge 13 can be reduced. Also, one magnetic flux of one permanent magnet 5 passes through one outer peripheral bridge, while two magnetic fluxes of permanent magnet 5 pass through one inner bridge 13. . As a result, assuming that the width of the outer bridge and the width of the inner bridge 13 are the same, the magnetic resistance of the inner bridge 13 is simply twice that of the outer bridge, and the inner bridge 13 has a smaller leakage flux.

以上のように、ロータ３を構成する第１積層鋼板５１の割合を多くして、回転電機１００のロータ３を製造すれば、機械特性と磁気特性の両方を向上し、低トルクリプル・高トルクな回転電機１００を提供できる。Ｖ字状に配置された永久磁石５の開き角度が十分大きく、永久磁石５がほぼ横一文字に配置される時や、永久磁石５の残留磁束密度が十分大きい時には、回転時においても、磁気吸引力と摩擦力のみで永久磁石５は磁石収納部９に固定されるため、この第１積層鋼板５１のみを積層してロータ３を製造することができる。   As described above, if the rotor 3 of the rotating electric machine 100 is manufactured by increasing the ratio of the first laminated steel sheet 51 constituting the rotor 3, both the mechanical characteristics and the magnetic characteristics are improved, and low torque ripple and high torque are obtained. The rotating electric machine 100 can be provided. When the opening angle of the V-shaped permanent magnets 5 is sufficiently large and the permanent magnets 5 are arranged substantially horizontally, or when the residual magnetic flux density of the permanent magnets 5 is sufficiently large, the magnetic attraction can be achieved even during rotation. Since the permanent magnet 5 is fixed to the magnet housing 9 only by the force and the frictional force, the rotor 3 can be manufactured by stacking only the first laminated steel sheet 51.

（変形例１）
次に第１の実施形態における変形例１について説明する。図４は、図１のＢ−Ｂ断面におけるステータ１及びロータ３の径方向断面図である。ロータ３のこの断面の第２積層鋼板５２は、Ｖ字状の磁石収納部９を設けたロータコア４と、Ｖ字状の磁石収納部９にＶ字状に配置されて１つの磁極を形成する複数の永久磁石５を備え、永久磁石５の外周側５ｂを拘束する外周ブリッジ１４を有する。第１積層鋼板５１に設けられていた内周ブリッジ１３は、第２積層鋼板５２には設けられていない。 (Modification 1)
Next, a first modification of the first embodiment will be described. FIG. 4 is a radial cross-sectional view of the stator 1 and the rotor 3 in the BB cross section of FIG. The second laminated steel sheet 52 of this cross section of the rotor 3 is arranged in the V-shaped magnet housing 9 with the rotor core 4 provided with the V-shaped magnet housing 9 and forms one magnetic pole. It has a plurality of permanent magnets 5, and has an outer peripheral bridge 14 that restrains the outer peripheral side 5 b of the permanent magnets 5. The inner peripheral bridge 13 provided on the first laminated steel sheet 51 is not provided on the second laminated steel sheet 52.

図５は、図４の破線４Ａで囲ったロータ３の１磁極分を拡大して示す拡大図であり、第２積層鋼板５２を示す。第２積層鋼板５２は、永久磁石５の外周側５ｂが外周ブリッジ１４で拘束されているため、外周ブリッジ１４への漏れ磁束は発生するが、遠心力による永久磁石５の飛び出しを防止することができる。   FIG. 5 is an enlarged view showing one magnetic pole of the rotor 3 surrounded by a broken line 4A in FIG. Since the outer peripheral side 5b of the permanent magnet 5 is constrained by the outer peripheral bridge 14 in the second laminated steel sheet 52, a magnetic flux leaking to the outer peripheral bridge 14 is generated, but it is possible to prevent the permanent magnet 5 from jumping out due to centrifugal force. it can.

Ｖ字状に配置された永久磁石５の開き角度がある程度大きい場合は、ロータコア４を構成する複数枚の積層鋼板５１、５２のうち、永久磁石５の飛び出しを防止するために必要な最低限の枚数の第２積層鋼板５２を用い、残りは第１積層鋼板５１とする。これにより、永久磁石５の飛び出しを防止して、低トルクリプル・高トルクな回転電機１００を提供できる。図６は、この変形例１に係るロータ３の軸方向断面図を示す。図６に示すとおり、第２積層鋼板５２をロータ３の軸方向両端部と中央部に配置する。このように、第２積層鋼板５２を少なくともロータ３の軸方向両端部に配置することで、破損しやすい永久磁石５の角部を第２積層鋼板５２の外周ブリッジ１４で保護しつつ、永久磁石５の本体の飛び出しも防止することができる。また、永久磁石５が軸方向に長い場合や、永久磁石５が軸方向に複数に分割されて配置されている場合においても、図６に示すとおり、軸方向両端部以外にも第２積層鋼板５２を配置することで、永久磁石５の角部を第２積層鋼板の外周ブリッジ１４で保護しつつ、永久磁石５の本体の飛び出しを確実に防止することができる。   When the opening angle of the V-shaped permanent magnets 5 is large to some extent, the minimum necessary for preventing the permanent magnets 5 from jumping out of the plurality of laminated steel plates 51 and 52 constituting the rotor core 4. The number of the second laminated steel sheets 52 is used, and the rest is the first laminated steel sheet 51. Thereby, the permanent magnet 5 is prevented from jumping out, and the rotating electric machine 100 with low torque ripple and high torque can be provided. FIG. 6 shows an axial sectional view of the rotor 3 according to the first modification. As shown in FIG. 6, the second laminated steel sheets 52 are arranged at both axial ends and the center of the rotor 3. By arranging the second laminated steel sheet 52 at least at both ends in the axial direction of the rotor 3 in this way, the corners of the permanent magnet 5 that are easily damaged are protected by the outer peripheral bridge 14 of the second laminated steel sheet 52, and the permanent magnet 5 can also be prevented from jumping out. Also, when the permanent magnet 5 is long in the axial direction or when the permanent magnet 5 is divided into a plurality of pieces in the axial direction, as shown in FIG. By arranging 52, it is possible to reliably prevent the main body of the permanent magnet 5 from jumping out while protecting the corners of the permanent magnet 5 with the outer peripheral bridge 14 of the second laminated steel sheet.

また、第１積層鋼板５１と第２積層鋼板５２とを積層してロータ３を構成した場合は、ロータ３のポールピース部１７を内周ブリッジ１３と外周ブリッジ１４の両方で支持することができる。このため、内周ブリッジ１３のみでロータ３を構成した場合よりも、回転電機１００の回転時のポールピース部１７のがたつきを抑制し、ポールピース部１７のがたつきに伴うコギングトルクやトルクリプルの発生を抑制できる。   Further, when the rotor 3 is configured by laminating the first laminated steel sheet 51 and the second laminated steel sheet 52, the pole piece portion 17 of the rotor 3 can be supported by both the inner bridge 13 and the outer bridge 14. . For this reason, the rattling of the pole piece portion 17 during rotation of the rotary electric machine 100 is suppressed as compared with the case where the rotor 3 is configured only by the inner peripheral bridge 13, and the cogging torque and the cogging torque accompanying the rattling of the pole piece portion 17 are reduced. The occurrence of torque ripple can be suppressed.

また、図３の第１積層鋼板５１や図５の第２積層鋼板５２に示すとおり、各積層鋼板５１、５２は周方向に隣り合うポールピース部１７の間に、ポールピース部１７の外周面（ステータ１との対向面）よりも内周側に凹んだ凹部１８を有している。一般に、磁極間（ｑ軸）において、ロータコア４の最外周部がステータ１に近いとそこに磁束が通り、トルクリプルが大きくなる。したがって、第１積層鋼板５１や第２積層鋼板５２の隣り合うポールピース部１７の間に凹部１８を設けることで、このトルクリプルの増加を抑制することができる。   Further, as shown in the first laminated steel sheet 51 of FIG. 3 and the second laminated steel sheet 52 of FIG. 5, each laminated steel sheet 51, 52 is disposed between the pole piece parts 17 adjacent in the circumferential direction and the outer peripheral surface of the pole piece part 17. It has a recessed portion 18 that is recessed on the inner peripheral side from (the surface facing the stator 1). Generally, between the magnetic poles (q axis), when the outermost peripheral portion of the rotor core 4 is close to the stator 1, a magnetic flux passes therethrough, and torque ripple increases. Therefore, by providing the concave portion 18 between the adjacent pole piece portions 17 of the first laminated steel plate 51 and the second laminated steel plate 52, it is possible to suppress the increase of the torque ripple.

（変形例２）
次に第１の実施形態における変形例２について説明する。図７は、図２の破線２Ａで囲ったロータ３の１磁極分の磁極付近の拡大図であり、第１積層鋼板５１を示す。また、図８は、図４の破線４Ａで囲ったロータ３の１磁極分を拡大して示す拡大図であり、第２積層鋼板５２を示す。図７の第１積層鋼板５１、図８の第２積層鋼板５２は、磁石収納部９の外径側に形成された複数のポールピース部１７を備え、ポールピース部１７は、隣接して積層する積層鋼板同士を連結するための連結部１９を有する。この連結部１９を用いて、第１積層鋼板５１同士や、第１積層鋼板５１と第２積層鋼板５２を、位置ずれを小さくして、強固に連結して積層することができる。 (Modification 2)
Next, a second modification of the first embodiment will be described. FIG. 7 is an enlarged view of the vicinity of one magnetic pole of the rotor 3 surrounded by the broken line 2A in FIG. FIG. 8 is an enlarged view showing one magnetic pole of the rotor 3 surrounded by a broken line 4A in FIG. The first laminated steel plate 51 of FIG. 7 and the second laminated steel plate 52 of FIG. 8 include a plurality of pole piece portions 17 formed on the outer diameter side of the magnet housing 9, and the pole piece portions 17 are stacked adjacent to each other. And a connecting portion 19 for connecting the laminated steel plates to be formed. By using the connecting portion 19, the first laminated steel plates 51, or the first laminated steel plates 51 and the second laminated steel plates 52, can be firmly connected and laminated with a small displacement.

これにより、コギングトルクに悪影響を及ぼす、ポールピース部１７の外径形状のばらつきや積層鋼板の積層間の隙間の発生を抑制することができる。ここで、連結部１９の位置を、ポールピース部１７の重心付近に設けることにより、ポールピース部１７の外縁全体で積層ばらつきや積層間の隙間を抑制することができる。   Thereby, it is possible to suppress the variation in the outer diameter shape of the pole piece portion 17 and the generation of the gap between the laminated steel plates, which adversely affect the cogging torque. Here, by providing the position of the connecting portion 19 near the center of gravity of the pole piece 17, it is possible to suppress lamination variation and a gap between the laminations over the entire outer edge of the pole piece 17.

また、連結部１９におけるロータ３の径方向断面形状は、ロータ３の径方向がロータ３の周方向より長くなるように形成する。これにより、ポールピース部１７の径方向を通る磁石磁束を阻害せず、トルク低下を避けることができる。連結部１９は、カシメ、接着剤、リベット、ボルト、ねじ、ビスなどにより形成され、隣接して積層する積層鋼板を互いに連結して固定する。   The radial cross section of the rotor 3 at the connecting portion 19 is formed such that the radial direction of the rotor 3 is longer than the circumferential direction of the rotor 3. Thereby, the magnet magnetic flux passing in the radial direction of the pole piece portion 17 is not obstructed, and a decrease in torque can be avoided. The connecting portion 19 is formed by caulking, an adhesive, a rivet, a bolt, a screw, a screw, or the like, and connects and fixes the laminated steel sheets that are adjacently stacked.

（変形例３）
図９は、変形例３に係る第１積層鋼板５１の１磁極分を拡大して示す拡大図である。図３に示した１磁極分の変形例であり、第１積層鋼板５１を例に説明するが、第２積層鋼板５２やその他の種類の積層鋼板の少なくとも一つの積層鋼板に以下に述べる構造を設けてもよい。図９に示すように、第１積層鋼板５１は、ポールピース部１７を内周ブリッジ１３で支持する。そして、第１積層鋼板５１は、永久磁石５の側面のうちロータ３の外周側の側面５ｂを拘束する突起２０を備える。また、ポールピース部１７は突起２１を備える。金型により、第１積層鋼板５１を打ち抜く場合、これらの突起２０及び突起２１が押さえとして用いられる。そしてこれらの突起２０及び突起２１が永久磁石５の側面５ａ、５ｂと接触しないので、漏れ磁束を低減できる。 (Modification 3)
FIG. 9 is an enlarged view showing one magnetic pole of the first laminated steel sheet 51 according to the third modification. This is a modification of one magnetic pole shown in FIG. 3, and the first laminated steel sheet 51 will be described as an example, but the structure described below is applied to at least one laminated steel sheet of the second laminated steel sheet 52 and other types of laminated steel sheets. It may be provided. As shown in FIG. 9, the first laminated steel plate 51 supports the pole piece portion 17 with the inner peripheral bridge 13. The first laminated steel plate 51 includes the protrusion 20 that restrains the side surface 5 b on the outer peripheral side of the rotor 3 among the side surfaces of the permanent magnet 5. Further, the pole piece portion 17 has a projection 21. When the first laminated steel plate 51 is punched by a mold, the projections 20 and the projections 21 are used as presses. Since the projections 20 and 21 do not contact the side surfaces 5a and 5b of the permanent magnet 5, the leakage magnetic flux can be reduced.

図１０は、変形例３の他の例に係る第１積層鋼板５１の１磁極分を拡大して示す拡大図である。第１積層鋼板５１は、内周ブリッジ１３とは別に、永久磁石５の内周側５ａに磁石位置決め突起２２を備えている。なお、内周ブリッジ１３に永久磁石５の内周側５ａに当接する突起を設けて、この突起により永久磁石５の内周側５ａの位置決めを行ってもよい。   FIG. 10 is an enlarged view showing one magnetic pole of a first laminated steel sheet 51 according to another example of the third modification. The first laminated steel sheet 51 has a magnet positioning projection 22 on the inner peripheral side 5 a of the permanent magnet 5, separately from the inner peripheral bridge 13. The inner peripheral bridge 13 may be provided with a projection that contacts the inner peripheral side 5a of the permanent magnet 5, and the projection may be used to position the inner peripheral side 5a of the permanent magnet 5.

［第２の実施形態］
図１１〜図１３を参照して、第２の実施形態に係る回転電機１００のロータ３の構成を説明する。図１１は、第２の実施形態に係る回転電機１００のステータ１及びロータ３の径方向断面図を示す。ロータ３のこの断面における第３積層鋼板５３は、Ｖ字状の磁石収納部９を設けたロータコア４と、Ｖ字状の磁石収納部９にＶ字状に配置されて１つの磁極を形成する複数の永久磁石５を備える。 [Second embodiment]
The configuration of the rotor 3 of the rotary electric machine 100 according to the second embodiment will be described with reference to FIGS. FIG. 11 is a radial cross-sectional view of the stator 1 and the rotor 3 of the rotary electric machine 100 according to the second embodiment. The third laminated steel sheet 53 in this cross section of the rotor 3 is arranged in the V-shaped magnet housing 9 with the rotor core 4 having the V-shaped magnet housing 9 and forms one magnetic pole. A plurality of permanent magnets 5 are provided.

第１の実施形態では、磁石収納部９の周囲に、内周ブリッジ１３や外周ブリッジ１４を有する例を説明したが、第２の実施形態の第３積層鋼板５３は、内周ブリッジ１３や外周ブリッジ１４を有しておらず、連結部１９を設けている。   In the first embodiment, an example in which the inner peripheral bridge 13 and the outer peripheral bridge 14 are provided around the magnet housing 9 has been described. However, the third laminated steel sheet 53 of the second embodiment includes the inner peripheral bridge 13 and the outer peripheral bridge 13. A connecting portion 19 is provided without the bridge 14.

図１２は、図１１の破線１１Ａで囲ったロータ３の１磁極分の磁極付近の拡大図であり、第３積層鋼板５３を示す。ロータ３を構成する複数枚の積層鋼板のうち、少なくとも１枚の積層鋼板は、第３積層鋼板５３であり、図１２に示すように、ポールピース部１７を内周側で保持し、永久磁石５の内周側を拘束するブリッジや永久磁石５の外周側を拘束するブリッジの両方を持たない。永久磁石５の周囲にブリッジ部がないため、第１積層鋼板５１よりも漏れ磁束を低減できる。第３積層鋼板５３を第１の実施形態で示した第１積層鋼板５１や第２積層鋼板５２とともに積層することで、第１の実施形態で示した回転電機１００よりもさらに低トルクリプル・高トルクな回転電機１００を提供できる。この第３積層鋼板５３も、第１積層鋼板５１や第２積層鋼板５２と同様、隣り合うポールピース部１７の間に凹部１８を設けておけば、トルクリプルを低減できる。ポールピース部１７には、隣接して積層する積層鋼板同士を連結するための連結部１９が設けられ、同種の連結部１９を設けた第１積層鋼板５１や第２積層鋼板５２と積層することで、ポールピース部１７を確実に固定する。連結部１９の位置や形状等は第１の実施形態で説明したとおりである。   FIG. 12 is an enlarged view of the vicinity of one magnetic pole of the rotor 3 surrounded by the broken line 11A in FIG. At least one of the plurality of laminated steel sheets constituting the rotor 3 is a third laminated steel sheet 53, and as shown in FIG. Neither a bridge that restricts the inner peripheral side of the permanent magnet 5 nor a bridge that restricts the outer peripheral side of the permanent magnet 5 is provided. Since there is no bridge portion around the permanent magnet 5, the leakage magnetic flux can be reduced as compared with the first laminated steel sheet 51. By laminating the third laminated steel sheet 53 together with the first laminated steel sheet 51 and the second laminated steel sheet 52 shown in the first embodiment, further lower torque ripple and higher torque than the rotating electric machine 100 shown in the first embodiment. The rotating electric machine 100 can be provided. In the third laminated steel sheet 53, similarly to the first laminated steel sheet 51 and the second laminated steel sheet 52, if the concave portion 18 is provided between the adjacent pole piece portions 17, the torque ripple can be reduced. The pole piece part 17 is provided with a connecting part 19 for connecting adjacent laminated steel sheets, and is laminated with the first laminated steel sheet 51 or the second laminated steel sheet 52 provided with the same kind of connecting part 19. Then, the pole piece 17 is securely fixed. The position, shape, and the like of the connecting portion 19 are as described in the first embodiment.

図１３は、第２の実施形態の変形例に係る第３積層鋼板５３の１磁極分を拡大して示す拡大図である。図１３に示すように、ブリッジを形成しない程度に永久磁石５の外周側５ｂに当接して、磁石位置決め突起２２を設けても良い。ブリッジを形成しないので、漏れ磁束を抑制して、永久磁石５の飛び出しを防止できる。   FIG. 13 is an enlarged view showing one magnetic pole of a third laminated steel sheet 53 according to a modification of the second embodiment. As shown in FIG. 13, the magnet positioning projection 22 may be provided in contact with the outer peripheral side 5b of the permanent magnet 5 to the extent that no bridge is formed. Since no bridge is formed, it is possible to suppress leakage magnetic flux and prevent the permanent magnet 5 from jumping out.

［第３の実施形態］
図１４〜図１５を参照して、第３の実施形態である回転電機１００のロータ３の構成を説明する。図１４は、第３の実施形態に係る回転電機１００の径方向断面図を示す。図１５は、第３の実施形態に係る回転電機１００のロータ３の磁極付近１４Ａの拡大図を示す。 [Third Embodiment]
The configuration of the rotor 3 of the rotary electric machine 100 according to the third embodiment will be described with reference to FIGS. FIG. 14 is a radial cross-sectional view of the rotating electric machine 100 according to the third embodiment. FIG. 15 is an enlarged view of the vicinity 14A of the magnetic pole of the rotor 3 of the rotary electric machine 100 according to the third embodiment.

図１４、図１５に示すとおり、ロータ３を構成する複数枚の各積層鋼板５４において、少なくとも１枚の積層鋼板５４は、複数の磁石収納部９のうち、半数は永久磁石５の内周側５ａを拘束する内周ブリッジ１３を有する第１磁石収納部２３であり、残りの半数は、永久磁石５の外周側５ｂを拘束する外周ブリッジ１４を有する第２磁石収納部２４である。この積層鋼板５４を、１枚毎または数枚毎に所定の角度ずつ回転して積層する。すなわち、ロータコア４は、第１磁石収納部２３および第２磁石収納部２４を備えた複数枚の積層鋼板５４を、ロータ３の軸を中心とする回転方向に所定角度ずつ互いにずらした状態で積層して形成される。このようにロータ３を製作することで、永久磁石５の飛び出しを防止しつつ、外周ブリッジ１４の数を減らし、内周ブリッジ１３の数を増やすことができ、第１の実施形態と同様の効果を得ることができる。   As shown in FIGS. 14 and 15, in the plurality of laminated steel plates 54 constituting the rotor 3, at least one of the laminated steel plates 54 has a half of the plurality of magnet housing portions 9 on the inner circumferential side of the permanent magnet 5. The first magnet storage portion 23 having the inner peripheral bridge 13 for restraining 5 a, and the other half is the second magnet storage portion 24 having the outer peripheral bridge 14 for restraining the outer peripheral side 5 b of the permanent magnet 5. The laminated steel plates 54 are laminated by rotating a predetermined angle every single sheet or every several sheets. That is, the rotor core 4 is formed by laminating a plurality of laminated steel plates 54 provided with the first magnet housing portion 23 and the second magnet housing portion 24 while being shifted from each other by a predetermined angle in a rotation direction about the axis of the rotor 3. Formed. By manufacturing the rotor 3 in this manner, it is possible to reduce the number of the outer peripheral bridges 14 and increase the number of the inner peripheral bridges 13 while preventing the permanent magnets 5 from jumping out, and the same effect as in the first embodiment. Can be obtained.

図１４と図１５では、第１磁石収納部２３を持つ磁極数と、第２磁石収納部２４を持つ磁極数を同数にしているが、ロータ３の機械強度を満たす範囲で、第２磁石収納部２４を持つ磁極数を減らし、第１磁石収納部２３を持つ磁極数を増やせば、回転電機１００の磁気特性をさらに向上できる。第３の実施形態では、１種類の積層鋼板５４を積層して製造するため、積層鋼板５４を打ち抜く金型の数を減らすこともできる。図１４、図１５ではＶ字型の埋め込み磁石式回転電機を例に取り説明したが、磁石収納部がＩ字状に配置された後述するスポーク式埋め込み磁石型回転電機についても、本技術を適用できる。   In FIGS. 14 and 15, the number of magnetic poles having the first magnet housing 23 and the number of magnetic poles having the second magnet housing 24 are the same. If the number of magnetic poles having the portion 24 is reduced and the number of magnetic poles having the first magnet housing portion 23 is increased, the magnetic characteristics of the rotating electric machine 100 can be further improved. In the third embodiment, since one type of laminated steel sheet 54 is laminated and manufactured, the number of dies for punching the laminated steel sheet 54 can be reduced. In FIGS. 14 and 15, a V-shaped embedded magnet type rotating electric machine has been described as an example, but the present technology is also applied to a spoke type embedded magnet type rotating electric machine described later in which the magnet storage portions are arranged in an I shape. it can.

［第４の実施形態］
図１６〜図１８を参照して、第４の実施形態である回転電機１００のロータ３の構成を説明する。図１６〜図１８は、第４の実施形態に係る回転電機１００のロータ３の１磁極分の拡大図を示す。図１６、図１７、図１８が、第１の実施形態及び第２の実施形態における、第１積層鋼板５１、第２積層鋼板５２、第３積層鋼板５３に、それぞれ対応している。第１の実施形態の第１積層鋼板５１や第２の実施形態の第３積層鋼板５３においては、永久磁石５の磁化方向１５に沿う外周側の側面５ｂがステータ１とロータ３の間のエアギャップ１２に開放されている。そのため、振動などで永久磁石５が破損した場合、開放部より微小な永久磁石５の破片は、エアギャップ１２中に飛び出し、回転中の回転電機１００がロックする懼れがある。 [Fourth embodiment]
A configuration of the rotor 3 of the rotary electric machine 100 according to the fourth embodiment will be described with reference to FIGS. 16 to 18 are enlarged views of one magnetic pole of the rotor 3 of the rotary electric machine 100 according to the fourth embodiment. FIGS. 16, 17, and 18 correspond to the first laminated steel plate 51, the second laminated steel plate 52, and the third laminated steel plate 53 in the first embodiment and the second embodiment, respectively. In the first laminated steel sheet 51 of the first embodiment and the third laminated steel sheet 53 of the second embodiment, the outer peripheral side surface 5b along the magnetization direction 15 of the permanent magnet 5 has an air gap between the stator 1 and the rotor 3. It is open to the gap 12. Therefore, when the permanent magnet 5 is damaged by vibration or the like, fragments of the permanent magnet 5 smaller than the open portion may fly out into the air gap 12 and lock the rotating electric machine 100 during rotation.

本実施形態では、図１６〜図１８に示すとおり、永久磁石５の磁化方向１５に沿う外周側の側面５ｂを覆うように、紙やテープなどの永久磁石５の飛散防止部材２５で永久磁石５の表面を保護する。これにより、永久磁石５の表面の破損を防止し、たとえ破損したとしても永久磁石５の破片が飛散することを防止することができる。この永久磁石５の飛散防止部材２５は、図１７の外周ブリッジ１４を持つ第２積層鋼板５２が積層されることにより、永久磁石５の表面からはがれることなく、確実に固定できる。飛散防止部材２５の形状は、図１６〜図１８に示すとおり、永久磁石５の磁化方向１５に沿う外周側の側面５ｂを含む周方向の一部を覆うようにしても良いし、永久磁石５の周方向全体または永久磁石５の全体を覆っても良い。   In the present embodiment, as shown in FIG. 16 to FIG. 18, the permanent magnet 5 is covered with a scattering prevention member 25 of Protect the surface. Thereby, it is possible to prevent the surface of the permanent magnet 5 from being damaged, and to prevent the fragments of the permanent magnet 5 from scattering even if the surface is damaged. The scattering prevention member 25 of the permanent magnet 5 can be securely fixed without being separated from the surface of the permanent magnet 5 by laminating the second laminated steel sheet 52 having the outer peripheral bridge 14 of FIG. As shown in FIGS. 16 to 18, the shape of the scattering prevention member 25 may cover a part of the circumferential direction including the outer peripheral side surface 5 b along the magnetization direction 15 of the permanent magnet 5. , Or the entire permanent magnet 5 may be covered.

［第５の実施形態］
図１９〜図２１を参照して、第５の実施形態である回転電機１００のロータ３の構成を説明する。図１９〜図２１は、第５の実施形態に係る回転電機１００のロータ３の径方向断面図を示す。I字状の磁石収納部９を設けたロータコア４と、I字状の磁石収納部９にI字状に配置されて１つの磁極を形成する永久磁石５とを備えた、いわゆるスポーク式埋め込み磁石型回転電機のロータ３である。図１９、図２０、図２１が、第１の実施形態及び第２の実施形態における、第１積層鋼板５１、第２積層鋼板５２、第３積層鋼板５３に、それぞれ対応している。Ｖ字状の磁石配置に対し、I字状の磁石配置とすることで、磁石の厚さは２倍になるが、磁石個数を半分にできる。その結果、磁石の径方向断面積を減らさずに、モータの極数(すなわち磁石の個数)を増やすことができるため、多極にして高トルクのモータを設計することができる。 [Fifth Embodiment]
The configuration of the rotor 3 of the rotary electric machine 100 according to the fifth embodiment will be described with reference to FIGS. 19 to 21 show radial cross-sectional views of the rotor 3 of the rotary electric machine 100 according to the fifth embodiment. A so-called spoke type embedded magnet including a rotor core 4 provided with an I-shaped magnet housing 9 and a permanent magnet 5 arranged in the I-shape in the I-shaped magnet housing 9 to form one magnetic pole. A rotor 3 of a rotary electric machine. FIGS. 19, 20, and 21 correspond to the first laminated steel sheet 51, the second laminated steel sheet 52, and the third laminated steel sheet 53 in the first embodiment and the second embodiment, respectively. By using an I-shaped magnet arrangement with respect to a V-shaped magnet arrangement, the thickness of the magnet is doubled, but the number of magnets can be reduced by half. As a result, the number of poles of the motor (that is, the number of magnets) can be increased without reducing the cross-sectional area of the magnet in the radial direction, so that a multi-pole, high-torque motor can be designed.

図１９に示すように、第１積層鋼板５１は、I字状の磁石収納部９で区分されたポールピース部１７を有し、このポールピース部１７をロータの内周側で保持する内周ブリッジ１３を有する。内周ブリッジ１３は、ポールピース部１７を半径方向で保持する内周ブリッジ１３ａとポールピース部１７を周方向で保持する内周ブリッジ１３ｂとを有する。永久磁石５の磁化方向１５に沿う永久磁石５の側面のうちロータ３の外周側の側面５ｂは第１積層鋼板５１と接触せず、磁石収納部９はステータ１との間に形成されるエアギャップ１２に連通する。   As shown in FIG. 19, the first laminated steel plate 51 has a pole piece 17 divided by an I-shaped magnet housing 9, and holds the pole piece 17 on the inner circumference side of the rotor. It has a bridge 13. The inner peripheral bridge 13 has an inner peripheral bridge 13a that holds the pole piece 17 in the radial direction and an inner peripheral bridge 13b that holds the pole piece 17 in the circumferential direction. Of the side surfaces of the permanent magnet 5 along the magnetization direction 15 of the permanent magnet 5, the side surface 5 b on the outer peripheral side of the rotor 3 does not contact the first laminated steel sheet 51, and the magnet housing portion 9 is formed by air formed between the permanent magnet 5 and the stator 1. It communicates with the gap 12.

ここで、内周ブリッジ１３ａと内周ブリッジ１３ｂの機械的、磁気的な特徴について述べる。ポールピース部１７に作用する遠心力に対し、内周ブリッジ１３ａにかかる応力は引っ張り応力であり、内周ブリッジ１３ｂにかかる応力は外周ブリッジ１４（図２０参照）と同様に曲げ応力と近似できる。そのため、内周ブリッジ１３ｂより内周ブリッジ１３ａの方が、機械強度に優れ、ブリッジ幅を細くしたり、ブリッジ数を減らすことができる。一方、単純に内周ブリッジ１３ａと内周ブリッジ１３ｂのブリッジ幅とブリッジ長さが同じと仮定すると、漏れ磁束が内周ブリッジ１３ａを通る磁路長よりも内周ブリッジ１３ｂを通る磁路長の方が、通過するブリッジの数が半分になるため短くなる。そのため、内周ブリッジ１３ｂの方が、内周ブリッジ１３ａよりも磁気抵抗が小さくなり漏れ磁束が大きい。以上より、内周ブリッジ１３ａと内周ブリッジ１３ｂのどちらか一方あるいは両方の個数や幅を減少させれば、漏れ磁束を低減できる。また、ロータ３には慣性や漏れ磁束の低減のため、肉抜き穴６０が開けられており、その外縁の一部は内周ブリッジ１３ａと内周ブリッジ１３ｂから成る。そのため、内周ブリッジ１３ａと内周ブリッジ１３ｂの機械強度や磁気特性は、この肉抜き穴６０の形状にも依存する。図１９のように、内周ブリッジ１３ａ(すなわち肉抜き穴６０の周方向外縁)は、回転時の過渡な応力集中を避けるため、内周ブリッジ１３ｂではなくポールピース１７の内周側に接続されていることが望ましい。   Here, mechanical and magnetic features of the inner bridge 13a and the inner bridge 13b will be described. With respect to the centrifugal force acting on the pole piece portion 17, the stress applied to the inner peripheral bridge 13a is a tensile stress, and the stress applied to the inner peripheral bridge 13b can be approximated to the bending stress similarly to the outer peripheral bridge 14 (see FIG. 20). Therefore, the inner peripheral bridge 13a has better mechanical strength than the inner peripheral bridge 13b, and can reduce the bridge width and reduce the number of bridges. On the other hand, assuming that the bridge width and the bridge length of the inner peripheral bridge 13a and the inner peripheral bridge 13b are simply the same, the leakage magnetic flux is smaller in the magnetic path length passing through the inner peripheral bridge 13b than the magnetic path length passing through the inner peripheral bridge 13a. This is shorter because the number of bridges passing through is halved. Therefore, the inner peripheral bridge 13b has a smaller magnetic resistance and a larger leakage magnetic flux than the inner peripheral bridge 13a. As described above, the leakage flux can be reduced by reducing the number or width of one or both of the inner bridge 13a and the inner bridge 13b. The rotor 3 is provided with a lightening hole 60 for reducing inertia and leakage magnetic flux, and a part of the outer edge thereof is formed by an inner peripheral bridge 13a and an inner peripheral bridge 13b. Therefore, the mechanical strength and magnetic properties of the inner peripheral bridge 13a and the inner peripheral bridge 13b also depend on the shape of the lightening hole 60. As shown in FIG. 19, the inner peripheral bridge 13a (that is, the outer peripheral edge of the lightening hole 60) is connected not to the inner peripheral bridge 13b but to the inner peripheral side of the pole piece 17 in order to avoid transient stress concentration during rotation. Is desirable.

図２０に示すように、第２積層鋼板５２は、永久磁石５の外周側の側面５ｂが外周ブリッジ１４で拘束されているため、外周ブリッジ１４への漏れ磁束は発生するが、遠心力による永久磁石５の飛び出しを防止することができる。図２０の第２積層鋼板５２において、内周ブリッジ１３ａや内周ブリッジ１３ｂは、ロータ３の強度上必要な最低限の本数まで減らすこともできる。一例として、図２０の第２積層鋼板５２では、内周ブリッジ１３ａの本数を、図１９の第１積層鋼板５１の半分にして、内周ブリッジ１３ｂの本数を第１積層鋼板５１と同数にしている。機械強度の裕度に応じて、内周ブリッジ１３ａの本数を増減させることもできる。他の例として、第２積層鋼板５２では、内周ブリッジ１３ｂのみ、図１９の第１積層鋼板５１より減らしても良いし、内周ブリッジ１３ａと内周ブリッジ１３ｂの両方を図１９の第１積層鋼板５１より減らしても良いし、内周ブリッジ１３ａと内周ブリッジ１３ｂを全て無くしても良い。内周ブリッジ１３ａを多用すれば、機械強度を上げることができる。一方、内周ブリッジ１３ｂを多用すれば、漏れ磁束を効果的に減らすことができる。   As shown in FIG. 20, in the second laminated steel sheet 52, since the outer peripheral side surface 5b of the permanent magnet 5 is constrained by the outer peripheral bridge 14, leakage magnetic flux to the outer peripheral bridge 14 is generated. The protrusion of the magnet 5 can be prevented. In the second laminated steel sheet 52 of FIG. 20, the number of the inner peripheral bridges 13a and the inner peripheral bridges 13b can be reduced to the minimum number necessary for the strength of the rotor 3. As an example, in the second laminated steel plate 52 of FIG. 20, the number of the inner peripheral bridges 13a is set to half of that of the first laminated steel plate 51 of FIG. 19, and the number of the inner peripheral bridges 13b is set to the same number as the first laminated steel plate 51. I have. The number of the inner peripheral bridges 13a can be increased or decreased according to the margin of the mechanical strength. As another example, in the second laminated steel sheet 52, only the inner peripheral bridge 13b may be reduced from the first laminated steel sheet 51 in FIG. 19, or both the inner peripheral bridge 13a and the inner peripheral bridge 13b may be replaced with the first in FIG. The number of the inner peripheral bridges 13a and 13b may be eliminated. If the inner peripheral bridge 13a is frequently used, mechanical strength can be increased. On the other hand, if the inner peripheral bridge 13b is frequently used, the leakage flux can be effectively reduced.

図２１に示すように、第３積層鋼板５３は、永久磁石５の外周側の側面５ｂを拘束する外周ブリッジ１４やポールピース部１７をロータ３の内周側で半径方向に保持する内周ブリッジ１３ａを持たず、ポールピース部１７をロータの内周側で周方向に保持する内周ブリッジ１３ｂと連結部１９を備える。連結部１９は、磁極の一つおきに設けた例を示したが、ロータ３の強度に応じて増減できる。永久磁石５の周囲にあるブリッジは内周ブリッジ１３ｂのみのため、図１９の第２積層鋼板５２よりも漏れ磁束を低減できる。また、図２１の第３積層鋼板５３では、各ポールピース部１７が内周ブリッジ１３ｂを介して連結しているため、ポールピース部１７のがたつきを抑制し、ポールピース部１７のがたつきに伴うコギングトルクやトルクリプルの発生を抑制できる。図２１は１例であり、第３積層鋼板５３の他の例として、内周ブリッジ１３ｂの本数を減らしても良いし、内周ブリッジ１３ｂを持たない代わりに内周ブリッジ１３ａを備えても良いし、内周ブリッジ１３ａと内周ブリッジ１３ｂの両方が無くても良い。内周ブリッジ１３ｂの本数を減らしたり無くす場合は、ポールピース部１７のがたつきや積層した時の位置ずれを抑制するため、各ポールピース部１７に連結部１９を備えて、各積層鋼板を強固に連結して積層することが望ましい。   As shown in FIG. 21, the third laminated steel sheet 53 includes an inner peripheral bridge 14 that holds the outer peripheral side surface 5 b of the permanent magnet 5 and an inner peripheral bridge that holds the pole piece portion 17 radially on the inner peripheral side of the rotor 3. An inner peripheral bridge 13b for holding the pole piece portion 17 in the circumferential direction on the inner peripheral side of the rotor, and a connecting portion 19 are provided. The example in which the connecting portion 19 is provided at every other magnetic pole has been described, but can be increased or decreased according to the strength of the rotor 3. Since the bridge around the permanent magnet 5 is only the inner peripheral bridge 13b, the leakage magnetic flux can be reduced as compared with the second laminated steel sheet 52 in FIG. Further, in the third laminated steel sheet 53 of FIG. 21, since the respective pole piece portions 17 are connected via the inner peripheral bridge 13b, the rattling of the pole piece portion 17 is suppressed, and the play of the pole piece portion 17 is suppressed. It is possible to suppress the occurrence of cogging torque and torque ripple due to sticking. FIG. 21 is an example. As another example of the third laminated steel sheet 53, the number of the inner peripheral bridges 13b may be reduced, or the inner peripheral bridge 13a may be provided instead of not having the inner peripheral bridge 13b. However, both the inner peripheral bridge 13a and the inner peripheral bridge 13b may not be provided. When the number of the inner peripheral bridges 13b is reduced or eliminated, each pole piece portion 17 is provided with a connecting portion 19 so as to suppress rattling of the pole piece portion 17 and displacement of the pole piece portion 17 when laminated. It is desirable that the layers are firmly connected and laminated.

［第６の実施形態］
図２２〜図２４を参照して、第６の実施形態である回転電機１００のロータ３の構成を説明する。図２２〜図２４は、第６の実施形態に係る回転電機１００のロータ３の径方向断面図を示す。ロータ３が、ロータコア４と、複数の永久磁石５と、１対の永久磁石５を有する磁極間に形成された軟磁性材からなる複数の疑似磁極２６を有する、いわゆるコンシクエントポール式回転電機である。図２２、図２３、図２４が、第１の実施形態及び第２の実施形態における、第１積層鋼板５１、第２積層鋼板５２、第３積層鋼板５３に、それぞれ対応している。コンシクエントポール式回転電機は、ロータ３の磁極が、軟磁性材料からなる疑似磁極２６と永久磁石５とで構成されるため、使用する永久磁石５の量を少なくできる。 [Sixth Embodiment]
The configuration of the rotor 3 of the rotary electric machine 100 according to the sixth embodiment will be described with reference to FIGS. FIGS. 22 to 24 show radial cross-sectional views of the rotor 3 of the rotary electric machine 100 according to the sixth embodiment. A so-called consequent pole type rotating electric machine in which the rotor 3 has a rotor core 4, a plurality of permanent magnets 5, and a plurality of pseudo magnetic poles 26 made of a soft magnetic material formed between magnetic poles having a pair of permanent magnets 5. is there. FIGS. 22, 23, and 24 correspond to the first laminated steel sheet 51, the second laminated steel sheet 52, and the third laminated steel sheet 53 in the first embodiment and the second embodiment, respectively. In the consequent pole type rotating electric machine, the magnetic poles of the rotor 3 are composed of the pseudo magnetic poles 26 made of a soft magnetic material and the permanent magnets 5, so that the amount of the permanent magnets 5 used can be reduced.

図２２に示すように、第１積層鋼板５１は、永久磁石５の磁化方向１５に沿う永久磁石５の側面のうちロータ３の内周側の側面５ａを拘束する内周ブリッジ１３を有する。
図２３に示すように、第２積層鋼板５２は、永久磁石５の外周側５ｂが外周ブリッジ１４で拘束されているため、外周ブリッジ１４への漏れ磁束は発生するが、遠心力による永久磁石５の飛び出しを防止することができる。
図２４に示すように、第３積層鋼板５３は、永久磁石５の内周側を拘束するブリッジや永久磁石５の外周側を拘束するブリッジの両方を持たず、連結部１９を備える。 As shown in FIG. 22, the first laminated steel sheet 51 has an inner peripheral bridge 13 that restrains a side surface 5 a on the inner peripheral side of the rotor 3 among the side surfaces of the permanent magnet 5 along the magnetization direction 15 of the permanent magnet 5.
As shown in FIG. 23, in the second laminated steel sheet 52, since the outer peripheral side 5 b of the permanent magnet 5 is constrained by the outer peripheral bridge 14, a magnetic flux leaking to the outer peripheral bridge 14 is generated. Can be prevented from jumping out.
As shown in FIG. 24, the third laminated steel sheet 53 includes the connecting portion 19 without having both a bridge that restricts the inner peripheral side of the permanent magnet 5 and a bridge that restricts the outer peripheral side of the permanent magnet 5.

第１の実施形態〜第６の実施形態では、Ｖ字状の磁石収納部９に永久磁石５を配置した例や、Ｉ字状の磁石収納部９に永久磁石５を配置した例で説明した。しかし、本発明はこれらに限定せず、例えば、Ｕ字状の磁石収納部９にＵ字状の永久磁石５を配置してもよく、Ｕ字状に限らずその他の形状であってもよい。   In the first to sixth embodiments, examples in which the permanent magnets 5 are arranged in the V-shaped magnet housing 9 and examples in which the permanent magnets 5 are arranged in the I-shaped magnet housing 9 have been described. . However, the present invention is not limited to these. For example, the U-shaped permanent magnets 5 may be arranged in the U-shaped magnet storage unit 9, and the U-shaped permanent magnets 5 may have other shapes. .

［第７の実施形態］
図２５を参照して、第７の実施形態である回転電機１００の駆動システムの構成を説明する。第１の実施形態から第６の実施形態で示したロータ３を備えた回転電機１００は、同一のインバータで駆動させても良いし、別のインバータで駆動させても良い。別のインバータで駆動させた場合、片方のインバータが故障した際でも、もう片方のインバータで回転電機１００を駆動させることができ、緊急時のフェールセーフの観点から有効である。図２５に本実施形態における回転電機１００の駆動システムを示す。 [Seventh Embodiment]
With reference to FIG. 25, a configuration of a drive system for a rotating electric machine 100 according to a seventh embodiment will be described. The rotating electric machine 100 including the rotor 3 shown in the first to sixth embodiments may be driven by the same inverter or by another inverter. When driven by another inverter, even if one of the inverters fails, the rotating electric machine 100 can be driven by the other inverter, which is effective from the viewpoint of fail-safe in an emergency. FIG. 25 shows a drive system of the rotating electric machine 100 according to the present embodiment.

図２等で示した１０極６０スロットの回転電機１００において、Ｕ相、Ｖ相、Ｗ相を２つのグループに分け、第１インバータ４１により、Ｕ１１〜Ｕ１５相、Ｖ１１〜Ｖ１５相、Ｗ１１〜Ｗ１５相が駆動され、第２インバータ４２により、Ｕ２１〜Ｕ２５相、Ｖ２１〜Ｖ２５相、Ｗ２１〜Ｗ２５相が駆動される。なお、２つのインバータで駆動する例を示したが、Ｕ相、Ｖ相、Ｗ相を複数のグループに分け、複数のインバータで駆動してもよい。   In the rotating electric machine 100 having 10 poles and 60 slots shown in FIG. 2 and the like, the U phase, the V phase, and the W phase are divided into two groups, and the first inverter 41 uses the U11 to U15 phases, V11 to V15 phases, and W11 to W15. The phases are driven, and the second inverter 42 drives the U21 to U25 phases, the V21 to V25 phases, and the W21 to W25 phases. Although an example of driving with two inverters has been described, the U-phase, V-phase, and W-phase may be divided into a plurality of groups and driven by a plurality of inverters.

［第８の実施形態］
図２６を参照して、第８の実施形態であるＥＰＳ装置について説明する。第１の実施形態から第６の実施形態で示した回転電機１００を電動パワーステアリング装置（ＥＰＳ装置）に適用した例である。このＥＰＳ装置は、ステアリングコラム付近にアシストトルクを発生させるための回転電機１００を備えていることから、コラムアシスト式と呼ばれる。本方式のＥＰＳ装置は、ステアリングホイールＳＴと、ステアリングホイールＳＴの回転駆動力を検出するトルクセンサＴＳと、トルクセンサＴＳの出力に基づいて、アシストトルクを制御するＥＣＵ（Electronic Control Unit）と、アシストルクを制御するＥＣＵの信号に基づいて、アシストルクを出力する回転電機１００とを備える。 [Eighth Embodiment]
An EPS apparatus according to an eighth embodiment will be described with reference to FIG. This is an example in which the rotating electric machine 100 shown in the first to sixth embodiments is applied to an electric power steering device (EPS device). This EPS device is called a column assist type because it has a rotating electric machine 100 for generating an assist torque near a steering column. The EPS device of this method includes a steering wheel ST, a torque sensor TS for detecting a rotational driving force of the steering wheel ST, an ECU (Electronic Control Unit) for controlling an assist torque based on an output of the torque sensor TS, A rotating electric machine 100 that outputs assist torque based on a signal from an ECU that controls the torque.

さらに、ＥＣＵおよび回転電機１００のエネルギー供給源となる車載用バッテリーＢＡと、回転電機１００の回転駆動力を歯車によって減速し、所望のトルクを出力するためのギア機構ＧＥとを備える。さらに、ギア機構ＧＥで発生したトルクを伝達するためのピニオンギアＰＮと、ピニオンギアＰＮとギア機構ＧＥをつなぐための一つまたは複数のロッドＲＯと、一つまたは複数のジョイントＪＴとを備える。   Further, the vehicle includes an in-vehicle battery BA serving as an energy supply source for the ECU and the rotating electric machine 100, and a gear mechanism GE for reducing the rotational driving force of the rotating electric machine 100 with gears and outputting a desired torque. Further, it includes a pinion gear PN for transmitting torque generated by the gear mechanism GE, one or a plurality of rods RO for connecting the pinion gear PN and the gear mechanism GE, and one or a plurality of joints JT.

さらに、ピニオンギアＰＮに発生する回転駆動力を水平方向の力に変化するラックギアＲＣＧと、ラックギアを覆うラックギアケースＲＣと、ラックケース内に塵などが入らないために設けられる第１のダストブーツＤＢ１と第２のダストブーツＤＢ２と、実際に舵取りが行われる第１のタイヤＷＨ１と、第２のタイヤＷＨ２と、ラック軸に発生する水平方向の力を第１のタイヤＷＨ１に伝えるための第１のタイロッドＴＲ１と、同じくラック軸に発生する水平方向の力を第２のタイヤＷＨ２に伝えるための第２のタイロッドＴＲ２とを備える。   Further, a rack gear RCG that changes the rotational driving force generated in the pinion gear PN into a horizontal force, a rack gear case RC that covers the rack gear, and a first dust boot DB1 that is provided to prevent dust and the like from entering the rack case. , A second dust boot DB2, a first tire WH1, which is actually steered, a second tire WH2, and a first tire WH1 for transmitting a horizontal force generated on a rack shaft to the first tire WH1. And a second tie rod TR2 for transmitting a horizontal force generated on the rack shaft to the second tire WH2.

次に、コラムアシスト式ＥＰＳ装置の動作を説明する。ステアリングホイールＳＴを回転させると、その回転駆動力をトルクセンサＴＳが検出する。トルクセンサＴＳの検出信号に基づいて、ＥＣＵが所望のアシストトルクを発生させるための通電パターンを演算して、回転電機１００に指令を出す。回転電機１００はＥＣＵの指令に基づいて通電を行い、アシストトルクを発生させる。回転電機１００に接続されたギア機構ＧＥにより減速され、ロッドＲＯとジョイントＪＴを介して、ピニオンギアＰＮに回転駆動力が伝達される。ピニオンギアＰＮはラックギアＲＣＧと噛合っており、それによって、ピニオンギアＰＮの回転駆動力は車の進行方向に対して直角方向の推力に変換される。こうして発生した水平方向の推力は、タイロッドＴＲ１およびＴＲ２を介して、タイヤＷＨ１およびＷＨ２の舵取りを行う。   Next, the operation of the column assist type EPS device will be described. When the steering wheel ST is rotated, the rotational driving force is detected by the torque sensor TS. The ECU calculates an energization pattern for generating a desired assist torque based on the detection signal of the torque sensor TS, and issues a command to the rotating electric machine 100. The rotating electric machine 100 performs energization based on a command from the ECU to generate an assist torque. The speed is reduced by the gear mechanism GE connected to the rotating electric machine 100, and the rotational driving force is transmitted to the pinion gear PN via the rod RO and the joint JT. The pinion gear PN meshes with the rack gear RCG, whereby the rotational driving force of the pinion gear PN is converted into a thrust perpendicular to the traveling direction of the vehicle. The horizontal thrust generated in this manner steers the tires WH1 and WH2 via the tie rods TR1 and TR2.

コラムアシスト式ＥＰＳ装置の他に、ピニオンギアＰＮ付近にアシストトルクを発生させるための回転電機１００を備えているピニオンアシスト式ＥＰＳ装置、ラックギアＲＣＧに対してアシストトルクを発生させるための回転電機１００が備えられているラックアシスト式ＥＰＳ装置などがある。   In addition to the column assist type EPS device, a pinion assist type EPS device including a rotary electric machine 100 for generating assist torque near the pinion gear PN, and a rotary electric machine 100 for generating assist torque for the rack gear RCG are provided. There is a rack assist type EPS device provided.

以上で説明した様々なＥＰＳ装置では、重大事故に直結するため、破損した永久磁石５による回転電機１００のロックは許されない。また、回転電機１００の振動エネルギーが、ギア機構ＧＥ、ロッドＲＯ、ピニオンギアＰＮなどの機械部品を介して、車室内に伝播し、運転席付近のパネルや内壁から音波として放出される。これを運転者が騒音（所謂、ジッパー音やファスナー音）として感じることになる。この騒音発生メカニズムは、回転電機１００を車室内に配置したコラムアシスト式ＥＰＳ装置、回転電機１００をエンジンルーム内に配置するピニオンアシスト式、ラックアシスト式などのＥＰＳ装置に共通である。   In the various EPS devices described above, since the serious accident is directly caused, the rotating electric machine 100 cannot be locked by the damaged permanent magnet 5. Further, the vibration energy of the rotating electric machine 100 propagates into the vehicle interior via mechanical parts such as the gear mechanism GE, the rod RO, and the pinion gear PN, and is emitted as sound waves from a panel or an inner wall near the driver's seat. This will be felt by the driver as noise (so-called zipper sound or fastener sound). This noise generation mechanism is common to column assist type EPS devices in which the rotating electric machine 100 is arranged in a vehicle cabin, and pinion assist type and rack assist type EPS devices in which the rotating electric machine 100 is arranged in an engine room.

第１の実施形態から第６の実施形態で示した回転電機１００を装着したＥＰＳ装置によれば、高信頼の回転電機１００のロック防止と、ステアリングホイール操作時のアシスト性能向上と、車室内の静音化を両立可能なＥＰＳ装置を提供できる。同様の効果は、ＥＰＳ装置のみならず他の自動車補機システム、例えば、電動ブレーキシステムに適用した場合においても発揮することができる。   According to the EPS device equipped with the rotating electric machine 100 shown in the first to sixth embodiments, the highly reliable prevention of the lock of the rotating electric machine 100, the improvement of the assist performance at the time of steering wheel operation, and the It is possible to provide an EPS device capable of achieving both noise reduction and noise reduction. The same effect can be exerted not only when applied to the EPS device but also to other automobile accessory systems, for example, when applied to an electric brake system.

（効果の検証）
図２７に、第２積層鋼板５２のみを積層してなる比較例の回転電機１００と第１の実施形態および第２の実施形態との対比結果を示す。回転電機１００のトルクＴ１、トルクリプルＴ２、コギングトルクＴ３のそれぞれについて、比較例を１とした場合の、第１の実施形態および第２の実施形態における比を示す。これらの結果は、磁界解析によるシミュレーションを用いて計算したものである。ここで、第１の実施形態は比較例の第２積層鋼板５２のうち８０％を第１積層鋼板５１で置き換えた回転電機１００である。第２の実施形態は比較例の第２積層鋼板５２のうち３３％を第１積層鋼板５１で置き換え、第２積層鋼板５２のうち５０％を第３積層鋼板５３で置き換えた回転電機１００である。 (Verification of effects)
FIG. 27 shows a comparison result between the rotating electric machine 100 of the comparative example in which only the second laminated steel sheet 52 is laminated, and the first and second embodiments. For each of the torque T1, the torque ripple T2, and the cogging torque T3 of the rotating electric machine 100, the ratio in the first embodiment and the second embodiment when the comparative example is set to 1 is shown. These results were calculated using simulation by magnetic field analysis. Here, the first embodiment is a rotating electric machine 100 in which 80% of the second laminated steel sheet 52 of the comparative example is replaced with the first laminated steel sheet 51. The second embodiment is a rotating electrical machine 100 in which 33% of the second laminated steel sheet 52 of the comparative example is replaced with the first laminated steel sheet 51, and 50% of the second laminated steel sheet 52 is replaced with the third laminated steel sheet 53. .

図２７に示すように、比較例よりも第１の実施形態の方が、漏れ磁束が小さいため、トルクＴ１が増加し、トルクリプルＴ２とコギングトルクＴ３が低減することが確認できる。さらに、第１の実施形態よりも第２の実施形態の方が、漏れ磁束が小さくなるため、トルクＴ１が増加し、トルクリプルＴ２が低減する。コギングトルクＴ３に関しては、位相が反転したために増加しているが、比較例に対しては低減していることが確認できる。
以上の実施形態では、１０極６０スロットの回転電機１００について述べたが、任意の極数、スロット数の回転電機１００に適用できる。また、ステータ巻線は、集中巻でも分布巻でも良い。 As shown in FIG. 27, it can be confirmed that the first embodiment has a smaller leakage magnetic flux than the comparative example, so that the torque T1 increases and the torque ripple T2 and the cogging torque T3 decrease. Furthermore, the leakage flux is smaller in the second embodiment than in the first embodiment, so that the torque T1 increases and the torque ripple T2 decreases. Regarding the cogging torque T3, it can be confirmed that the cogging torque T3 has increased due to the phase inversion, but has decreased with respect to the comparative example.
In the above embodiment, the rotating electric machine 100 having 10 poles and 60 slots has been described, but the present invention can be applied to the rotating electric machine 100 having an arbitrary number of poles and slots. Further, the stator winding may be a concentrated winding or a distributed winding.

以上説明した実施形態によれば、次の作用効果が得られる。
（１）回転電機１００のロータ３は、複数枚の積層鋼板により構成され複数の磁石収納部９を設けたロータコア４と、複数の磁石収納部９にそれぞれ収納されて磁極を形成する複数の永久磁石５とを備え、複数枚の積層鋼板は、ロータ３の外周側であって磁石収納部９で区分された複数のポールピース部１７を備え、複数枚の積層鋼板のうち、少なくとも１枚の第１積層鋼板５１は、ポールピース部１７をロータ３の内周側で保持する内周ブリッジ１３を備え、永久磁石５の磁化方向１５に沿う永久磁石５の側面のうちロータ３の外周側の側面５ｂは第１積層鋼板５１と接触せず、磁石収納部９がロータ３とステータ１との間に形成されるエアギャップ１２に連通する。これにより、ロータコア４を形成する積層鋼板からの漏れ磁束を低減することで、回転電機１００の低トルクリプル化、高トルク化を実現できる。 According to the embodiment described above, the following operation and effect can be obtained.
(1) The rotor 3 of the rotary electric machine 100 is composed of a plurality of laminated steel plates and has a rotor core 4 provided with a plurality of magnet housing portions 9 and a plurality of permanent magnets housed in the plurality of magnet housing portions 9 to form magnetic poles. And a plurality of laminated steel sheets provided with the magnet 5, the plurality of laminated steel sheets provided with a plurality of pole piece portions 17 on the outer peripheral side of the rotor 3 and divided by the magnet storage portions 9, and at least one of the plurality of laminated steel sheets. The first laminated steel sheet 51 includes an inner peripheral bridge 13 that holds the pole piece portion 17 on the inner peripheral side of the rotor 3, and the outer peripheral side of the rotor 3 among the side surfaces of the permanent magnet 5 along the magnetization direction 15 of the permanent magnet 5. The side surface 5b does not contact the first laminated steel sheet 51, and the magnet housing 9 communicates with the air gap 12 formed between the rotor 3 and the stator 1. Accordingly, by reducing the leakage magnetic flux from the laminated steel sheet forming the rotor core 4, low torque ripple and high torque of the rotating electric machine 100 can be realized.

（２）回転電機１００のロータ３は、複数枚の積層鋼板により構成され複数の磁石収納部２３、２４を設けたロータコアと、複数の磁石収納部２３、２４にそれぞれ収納されて磁極を形成する複数の永久磁石５とを備え、複数枚の積層鋼板のうち、少なくとも１枚は、永久磁石５の磁化方向１５に沿う永久磁石５の側面のうちロータ３の内周側の側面５ａを拘束する内周ブリッジ１３を有する第１磁石収納部２３、および永久磁石５の側面のうちロータ３の外周側の側面５ｂを拘束する外周ブリッジ１４を有する第２磁石収納部２４を備える。これにより、ロータコア４を形成する積層鋼板からの漏れ磁束を低減することで、回転電機１００の低トルクリプル化、高トルク化を実現できる。 (2) The rotor 3 of the rotary electric machine 100 is formed of a plurality of laminated steel plates and has a rotor core provided with a plurality of magnet housing portions 23 and 24 and housed in the plurality of magnet housing portions 23 and 24 to form magnetic poles. A plurality of permanent magnets 5 are provided, and at least one of the plurality of laminated steel plates restrains a side surface 5 a on the inner peripheral side of the rotor 3 among the side surfaces of the permanent magnet 5 along the magnetization direction 15 of the permanent magnet 5. A first magnet housing portion 23 having an inner circumferential bridge 13 and a second magnet housing portion 24 having an outer circumferential bridge 14 for restraining a side surface 5b on the outer circumferential side of the rotor 3 among the side surfaces of the permanent magnet 5 are provided. Accordingly, by reducing the leakage magnetic flux from the laminated steel sheet forming the rotor core 4, low torque ripple and high torque of the rotating electric machine 100 can be realized.

以上、本発明の実施形態について詳述したが、本発明は、第１〜第８の実施形態に限定されるものではなく、本発明の特徴を損なわない限り、本発明の技術思想の範囲内で考えられるその他の形態についても、本発明の範囲内に含まれる。例えば、各実施形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。さらに、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。また、上述の実施形態と複数の変形例を組み合わせた構成としてもよい。   As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to the first to eighth embodiments, and is within the technical idea of the present invention unless the characteristics of the present invention are impaired. Other forms considered in the above are also included in the scope of the present invention. For example, each embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the described configurations. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of one embodiment can be added to the configuration of another embodiment. Further, for a part of the configuration of each embodiment, it is possible to add, delete, or replace another configuration. Further, a configuration in which the above-described embodiment and a plurality of modified examples are combined may be adopted.

１…ステータ、２…ステータコア、３…ロータ、４…ロータ-コア、５…永久磁石、６…コイルエンド部、７…駆動軸、８…フレーム、９…磁石収納部、１０…コイル、１１…ティース、１２…エアギャップ、１３…内周ブリッジ、１４…外周ブリッジ、１５…磁化方向、１７…ポールピース部、１８…凹部、１９…連結部、２０・２１…突起、２２…磁石位置決め突起、２３…第１磁石収納部、２４…第２磁石収納部、２５…飛散防止部材、２６…疑似磁極、４１…第１インバータ、４２…第２インバータ、５１…第１積層鋼板、５２…第２積層鋼板、５３…第３積層鋼板、６０…肉抜き穴、１００…回転電機、ＳＴ…ステアリングホイール、ＴＳ…トルクセンサ、ＧＥ…ギア機構、ＥＣＵ…制御装置、ＢＡ…車載用バッテリー、ＪＴ…ジョイント、ＲＯ…ロッド、ＲＣＧ…ラックギア、ＲＣ…ラックギアケース、ＰＮ…ピニオンギア、ＤＢ…ダストブーツ、ＴＲ…タイロッド、ＷＨ…タイヤ、ＢＳ…ボールスクリュー、ＢＴ…ベルト。 DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Stator core, 3 ... Rotor, 4 ... Rotor-core, 5 ... Permanent magnet, 6 ... Coil end part, 7 ... Drive shaft, 8 ... Frame, 9 ... Magnet accommodation part, 10 ... Coil, 11 ... Teeth, 12: air gap, 13: inner bridge, 14: outer bridge, 15: magnetization direction, 17: pole piece portion, 18: concave portion, 19: connecting portion, 20/21: projection, 22: magnet positioning projection, Reference numeral 23: first magnet storage portion, 24: second magnet storage portion, 25: scattering prevention member, 26: pseudo magnetic pole, 41: first inverter, 42: second inverter, 51: first laminated steel sheet, 52: second Laminated steel sheet, 53: third laminated steel sheet, 60: lightening hole, 100: rotating electric machine, ST: steering wheel, TS: torque sensor, GE: gear mechanism, ECU: control device, BA: vehicle-mounted battery, JT: jo Int, RO: rod, RCG: rack gear, RC: rack gear case, PN: pinion gear, DB: dust boot, TR: tie rod, WH: tire, BS: ball screw, BT: belt.

Claims (18)

複数枚の積層鋼板により構成され複数の磁石収納部を設けたロータコアと、前記複数の磁石収納部にそれぞれ収納されて磁極を形成する複数の永久磁石とを備えた回転電機のロータにおいて、
前記複数枚の積層鋼板は、前記ロータの外周側であって前記磁石収納部で区分された複数のポールピース部を備え、
前記複数枚の積層鋼板のうち、少なくとも１枚の第１積層鋼板は、前記ポールピース部を前記ロータの内周側で保持する内周ブリッジを備え、
前記永久磁石の磁化方向に沿う前記永久磁石の側面のうち前記ロータの外周側の側面は前記第１積層鋼板と接触せず、前記磁石収納部が前記ロータとステータとの間に形成されるエアギャップに連通する回転電機のロータ。 In a rotor of a rotating electric machine including a rotor core including a plurality of laminated steel sheets and provided with a plurality of magnet housing portions, and a plurality of permanent magnets housed in the plurality of magnet housing portions to form magnetic poles,
The plurality of laminated steel sheets includes a plurality of pole piece portions that are divided on the outer side of the rotor and the magnet housing portion,
At least one first laminated steel sheet of the plurality of laminated steel sheets includes an inner peripheral bridge that holds the pole piece portion on an inner peripheral side of the rotor,
Of the side surfaces of the permanent magnet along the magnetization direction of the permanent magnet, the side surface on the outer peripheral side of the rotor does not contact the first laminated steel sheet, and the air in which the magnet storage portion is formed between the rotor and the stator is formed. A rotating electric machine rotor that communicates with the gap. 請求項１に記載の回転電機のロータにおいて、
前記磁石収納部は、Ｖ字状に配置され、前記永久磁石は、前記Ｖ字状に配置された前記磁石収納部に収納されて磁極を形成する回転電機のロータ。 The rotor of the rotating electric machine according to claim 1,
The rotor of a rotary electric machine, wherein the magnet storage unit is arranged in a V-shape, and the permanent magnet is stored in the magnet storage unit arranged in the V-shape to form a magnetic pole. 請求項１に記載の回転電機のロータにおいて、
前記磁石収納部は、Ｉ字状に配置され、前記永久磁石は、前記Ｉ字状に配置された前記磁石収納部に収納されて磁極を形成する回転電機のロータ。 The rotor of the rotating electric machine according to claim 1,
The rotor of a rotating electric machine wherein the magnet storage portion is arranged in an I shape, and the permanent magnet is stored in the I shape arranged magnet storage portion to form a magnetic pole. 請求項１から請求項３までのいずれか一項に記載の回転電機のロータにおいて、
前記複数枚の積層鋼板のうち、少なくとも１枚の第２積層鋼板は、前記永久磁石の前記外周側の側面を拘束する外周ブリッジを備える回転電機のロータ。 The rotor of the rotating electric machine according to any one of claims 1 to 3,
At least one second laminated steel sheet among the plurality of laminated steel sheets is a rotor of a rotating electric machine including an outer peripheral bridge that restrains the outer peripheral side surface of the permanent magnet. 請求項４に記載の回転電機のロータにおいて、
前記第２積層鋼板は、前記ロータの軸方向両端部付近に配置される回転電機のロータ。 The rotor of the rotating electric machine according to claim 4,
The rotor of a rotating electrical machine wherein the second laminated steel sheet is disposed near both axial ends of the rotor. 請求項１から請求項３までのいずれか一項に記載の回転電機のロータにおいて、
前記ポールピース部は、隣接して積層する積層鋼板を連結する連結部を備える回転電機のロータ。 The rotor of the rotating electric machine according to any one of claims 1 to 3,
The rotor of a rotary electric machine, wherein the pole piece portion includes a connecting portion that connects adjacent laminated steel plates. 請求項６に記載の回転電機のロータにおいて、
前記連結部は、前記ポールピース部の重心付近に設けられる回転電機のロータ。 The rotor of the rotating electric machine according to claim 6,
The rotor of the rotating electric machine, wherein the connection portion is provided near a center of gravity of the pole piece portion. 請求項６に記載の回転電機のロータにおいて、
前記連結部における前記ロータの径方向断面形状は、前記ロータの径方向が前記ロータの周方向より長く形成される回転電機のロータ。 The rotor of the rotating electric machine according to claim 6,
The rotor of the rotating electric machine, wherein a radial cross-sectional shape of the rotor at the connection portion is formed such that a radial direction of the rotor is longer than a circumferential direction of the rotor. 請求項６に記載の回転電機のロータにおいて、
前記連結部は、カシメ、接着剤、リベット、ボルト、ねじ、ビスのいずれか一つにより形成される回転電機のロータ。 The rotor of the rotating electric machine according to claim 6,
The connecting part is a rotor of a rotating electric machine formed by any one of a caulking, an adhesive, a rivet, a bolt, a screw, and a screw. 請求項１に記載の回転電機のロータにおいて、
前記ポールピース部を備える前記積層鋼板は、周方向に隣り合う前記ポールピース部の間に、前記ポールピース部の外周面よりも内周側に凹んだ凹部が形成されている回転電機のロータ。 The rotor of the rotating electric machine according to claim 1,
The rotor of a rotating electric machine, wherein the laminated steel sheet including the pole piece portion has a concave portion formed between the pole piece portions adjacent in the circumferential direction, the concave portion being recessed inward from the outer peripheral surface of the pole piece portion. 請求項４に記載の回転電機のロータにおいて、
前記複数枚の積層鋼板のうち、少なくとも１枚の第３積層鋼板は、前記内周ブリッジおよび前記外周ブリッジを有しない回転電機のロータ。 The rotor of the rotating electric machine according to claim 4,
At least one third laminated steel plate among the plurality of laminated steel plates is a rotor of a rotating electric machine that does not have the inner bridge and the outer bridge. 請求項１１に記載の回転電機のロータにおいて、
前記第１積層鋼板、もしくは前記第３積層鋼板の少なくとも一つの積層鋼板は、前記永久磁石の前記外周側の側面を拘束する突起を備える回転電機のロータ。 The rotor of the rotating electric machine according to claim 11,
At least one laminated steel sheet of the first laminated steel sheet or the third laminated steel sheet is a rotor of a rotating electric machine including a projection for restraining a side surface on an outer peripheral side of the permanent magnet. 複数枚の積層鋼板により構成され複数の磁石収納部を設けたロータコアと、前記複数の磁石収納部にそれぞれ収納されて磁極を形成する複数の永久磁石とを備えた回転電機のロータにおいて、
前記複数枚の積層鋼板のうち、少なくとも１枚は、前記永久磁石の磁化方向に沿う永久磁石の側面のうち前記ロータの内周側の側面を拘束する内周ブリッジを有する第１磁石収納部、および前記永久磁石の側面のうち前記ロータの外周側の側面を拘束する外周ブリッジを有する第２磁石収納部を備える回転電機のロータ。 In a rotor of a rotating electric machine including a rotor core including a plurality of laminated steel sheets and provided with a plurality of magnet housing portions, and a plurality of permanent magnets housed in the plurality of magnet housing portions to form magnetic poles,
At least one of the plurality of laminated steel sheets has a first magnet housing portion having an inner peripheral bridge that restrains an inner peripheral side surface of the rotor among side surfaces of the permanent magnet along a magnetization direction of the permanent magnet, And a second magnet accommodating portion having an outer peripheral bridge that restrains an outer peripheral side surface of the rotor among the side surfaces of the permanent magnet. 請求項１３に記載の回転電機のロータにおいて、
前記磁石収納部は、Ｖ字状に配置され、前記永久磁石は、前記Ｖ字状に配置された前記第１磁石収納部および前記第２磁石収納部に収納されて磁極を形成する回転電機のロータ。 The rotor of the rotating electric machine according to claim 13,
The magnet housing is arranged in a V shape, and the permanent magnet is housed in the first magnet housing and the second magnet housing arranged in the V shape to form a magnetic pole. Rotor. 請求項１３に記載の回転電機のロータにおいて、
前記磁石収納部は、Ｉ字状に配置され、前記永久磁石は、前記Ｉ字状に配置された前記第１磁石収納部および前記第２磁石収納部に収納されて磁極を形成する回転電機のロータ。 The rotor of the rotating electric machine according to claim 13,
The magnet housing is arranged in an I shape, and the permanent magnet is housed in the first magnet housing and the second magnet housing arranged in the I shape to form a magnetic pole. Rotor. 請求項１３から請求項１５までのいずれか一項に記載の回転電機のロータにおいて、
前記ロータコアは、前記第１磁石収納部および前記第２磁石収納部を備えた複数枚の積層鋼板を、前記ロータの軸を中心とする回転方向に所定角度ずつ互いにずらした状態で積層して形成される回転電機のロータ。 The rotor of the rotating electric machine according to any one of claims 13 to 15,
The rotor core is formed by laminating a plurality of laminated steel sheets provided with the first magnet housing portion and the second magnet housing portion while being shifted from each other by a predetermined angle in a rotation direction about the axis of the rotor. Of the rotating electric machine to be used. 請求項１または請求項１２に記載の回転電機のロータにおいて、
前記磁極の間に軟磁性材から成る疑似磁極が形成されている回転電機のロータ。 The rotary electric machine rotor according to claim 1 or 12,
A rotary electric machine rotor in which a pseudo magnetic pole made of a soft magnetic material is formed between the magnetic poles. 請求項１または請求項１３に記載の回転電機のロータを備えた回転電機において、
前記回転電機は、２つ以上のインバータで駆動される回転電機。 A rotating electrical machine comprising the rotor of the rotating electrical machine according to claim 1 or claim 13,
The rotating electric machine is a rotating electric machine driven by two or more inverters.
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