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JP2011004480A - Permanent magnet embedded rotary electric machine - Google Patents

Permanent magnet embedded rotary electric machine Download PDF

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JP2011004480A
JP2011004480A JP2009143863A JP2009143863A JP2011004480A JP 2011004480 A JP2011004480 A JP 2011004480A JP 2009143863 A JP2009143863 A JP 2009143863A JP 2009143863 A JP2009143863 A JP 2009143863A JP 2011004480 A JP2011004480 A JP 2011004480A
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laminated steel
rotor
holding
pole
holding hole
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JP5412978B2 (en
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Shigeo Sakurai
茂夫 桜井
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet embedded rotary electric machine capable of improving magnetic characteristics while maintaining stamping processability and core strength.SOLUTION: The permanent magnet embedded rotary electric machine includes a core section of a rotor 10, which is constituted by alternately laminating one by one a laminated steel plate 11 having outer edge supports 19a, 19b formed between holding holes 18a, 18b of permanent magnets 13a, 13b and outer edges, and a laminated steel plate 12 having cut sections 16a, 16b continuing from the holding holes 18a', 18b' of the permanent magnets 13a, 13b to the outer edges.

Description

本発明は、回転子に永久磁石が埋め込まれた永久磁石埋込式回転電機に関する。   The present invention relates to a permanent magnet embedded type rotating electrical machine in which a permanent magnet is embedded in a rotor.

回転子（以降、ロータと呼ぶ。）に永久磁石が埋め込まれた永久磁石埋込式回転電機が従来技術として知られており、通常、ＩＰＭモータ（Interior Permanent Magnet Motor）と呼ばれている。   A permanent magnet embedded type rotating electrical machine in which a permanent magnet is embedded in a rotor (hereinafter referred to as a rotor) is known as a prior art, and is usually called an IPM motor (Interior Permanent Magnet Motor).

特開２００５−３２８６７９号公報JP 2005-328679 A 特開２００８−１４８４８２号公報JP 2008-148482 A

ＩＰＭモータのロータにおいては、複数の極を形成するため、ロータの外周部分に複数の永久磁石が等間隔に埋め込まれているが、隣接する永久磁石間の鉄心部位を通して、磁気短絡（磁束漏れ）が生じる問題がある。又、Ｖ字状に配置した２つの永久磁石を一極分とする場合、永久磁石間の部分となるＶ字の中央の鉄心部位を通して、同一永久磁石の異極間で磁気短絡が生じる問題が有る。そのため、永久磁石間の部分において、磁気抵抗を大きくして、磁束漏れを抑制することにより、モータ効率を向上させる技術が提案されている。   In the rotor of an IPM motor, a plurality of permanent magnets are embedded at equal intervals in the outer peripheral portion of the rotor to form a plurality of poles. However, a magnetic short circuit (magnetic flux leakage) passes through an iron core portion between adjacent permanent magnets. There is a problem that occurs. In addition, when two permanent magnets arranged in a V shape are used as one pole, there is a problem that a magnetic short circuit occurs between different poles of the same permanent magnet through a central iron core portion of the V shape which is a portion between the permanent magnets. Yes. For this reason, a technique has been proposed in which the motor efficiency is improved by increasing the magnetic resistance and suppressing magnetic flux leakage in the portion between the permanent magnets.

例えば、特許文献１においては、永久磁石に接する空気部分（フラックスバリア）を設置することにより、磁気抵抗を大きくし、磁束漏れを抑制している。ここで、一般的な構成例を図５に示すが、図５に示すロータ４０では、２つの永久磁石４３をＶ字状に配置し、これらを一極分としている。ロータ４０では、図５に示すように、２つの永久磁石４３間の部分に、永久磁石４３に接するフラックスバリア穴４４を各々設け、隣接する他極との間の部分に、永久磁石４３に接するフラックスバリア穴４５を各々設けることにより、鉄心部位４７、４９の磁気抵抗を大きくし、磁束漏れを抑制している。より効果的に、磁気抵抗を大きくし、磁束漏れを抑制するためには、永久磁石４３の磁束の通過方向に対して、鉄心部位４７、４９を細くすることが望ましい。   For example, in Patent Document 1, by installing an air portion (flux barrier) in contact with a permanent magnet, the magnetic resistance is increased and magnetic flux leakage is suppressed. Here, a general configuration example is shown in FIG. 5, but in the rotor 40 shown in FIG. 5, two permanent magnets 43 are arranged in a V shape, and these are used as one pole. In the rotor 40, as shown in FIG. 5, flux barrier holes 44 that are in contact with the permanent magnet 43 are provided in the portion between the two permanent magnets 43, and the portion between the adjacent other poles is in contact with the permanent magnet 43. By providing each flux barrier hole 45, the magnetic resistance of the iron core portions 47 and 49 is increased, and magnetic flux leakage is suppressed. In order to increase the magnetic resistance and suppress the magnetic flux leakage more effectively, it is desirable to make the core portions 47 and 49 thinner with respect to the direction in which the permanent magnet 43 passes the magnetic flux.

しかしながら、ロータ４０の回転時においては、永久磁石４３に働く遠心力が鉄心部位４７、４９に加わるため、鉄心部位４７、４９を細くしすぎると、遠心力に対する強度が下がることになり、これらの部位の強度を所定の大きさ以上にする必要があった。又、鉄心部位４７、４９を細くしすぎると、積層鋼板４１の打ち抜き加工時に変形し易くなり、歪んでしまう等の支障が生じることになり、これらの部位の大きさを所定の大きさ以上に維持する必要があった。   However, when the rotor 40 rotates, the centrifugal force acting on the permanent magnet 43 is applied to the iron core portions 47 and 49. Therefore, if the iron core portions 47 and 49 are made too thin, the strength against the centrifugal force is reduced. It was necessary to increase the strength of the part to a predetermined size or more. Further, if the core portions 47 and 49 are too thin, the laminated steel plate 41 is easily deformed during punching, which causes troubles such as distortion, and the size of these portions exceeds a predetermined size. There was a need to maintain.

そこで、強度低下を抑制しつつ、磁束漏れを抑制することにより、モータ効率を向上させる技術も提案されている。例えば、特許文献２では、図６に示すロータ５０のように、Ｖ字状に配置した永久磁石５３に隣接する他極との間の部分に、永久磁石５３に接するフラックスバリア穴５４を各々設けると共に、永久磁石５３の保持穴から独立したフラックスバリア穴５５を設けること、つまり、フラックスバリア穴５５を分離して設けることにより、フラックスバリア部５９における強度低下を抑制しつつ、磁束漏れを抑制している。   Therefore, a technique for improving motor efficiency by suppressing magnetic flux leakage while suppressing strength reduction has also been proposed. For example, in Patent Document 2, as in the rotor 50 shown in FIG. 6, flux barrier holes 54 that are in contact with the permanent magnets 53 are respectively provided in portions between the other poles adjacent to the permanent magnets 53 arranged in a V shape. At the same time, by providing the flux barrier hole 55 independent from the holding hole of the permanent magnet 53, that is, by providing the flux barrier hole 55 separately, the magnetic flux leakage is suppressed while suppressing the strength decrease in the flux barrier portion 59. ing.

しかしながら、図６に示すロータ５０の構造においては、ロータ５０の強度低下を抑制するためには、ロータ５０の外周面からの永久磁石５３の距離を離す必要があり、その場合には、モータ効率が低下してしまう。逆に、モータ効率向上のために磁気抵抗を増やそうとすると、ロータ５０の外周面に永久磁石５３を近づける必要があり、フラックスバリア部５９が細くなってしまい、遠心力に対する強度が低下してしまう。フラックスバリア部５９が細くなる場合には、やはり、積層鋼板５１の打ち抜き加工時に変形し易くなり、歪んでしまう等の支障が生じることになる。又、図６に示すロータ５０の場合には、ｑ軸磁束の通過部分にフラックスバリア穴５５が設けられているため、リラクタンストルクが低下し、モータ効率が悪化するという問題もある。   However, in the structure of the rotor 50 shown in FIG. 6, it is necessary to increase the distance of the permanent magnet 53 from the outer peripheral surface of the rotor 50 in order to suppress the strength reduction of the rotor 50. Will fall. Conversely, if the magnetic resistance is increased in order to improve the motor efficiency, it is necessary to bring the permanent magnet 53 closer to the outer peripheral surface of the rotor 50, the flux barrier portion 59 becomes thinner, and the strength against centrifugal force is reduced. . If the flux barrier portion 59 is thin, it is likely to be deformed at the time of punching the laminated steel plate 51, causing problems such as distortion. Further, in the case of the rotor 50 shown in FIG. 6, since the flux barrier hole 55 is provided in the passage portion of the q-axis magnetic flux, there is a problem that the reluctance torque is reduced and the motor efficiency is deteriorated.

本発明は上記課題に鑑みなされたもので、打ち抜き加工性、鉄心強度を確保しつつ、磁気特性を向上させることができる永久磁石埋込式回転電機を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a permanent magnet embedded rotary electric machine capable of improving magnetic characteristics while ensuring punching workability and iron core strength.

上記課題を解決する第１の発明に係る永久磁石埋込式回転電機は、
回転子の外側又は内側に向かって広がるように配置した２つの永久磁石を一極分として、前記２つの永久磁石を前記回転子の内部に複数組埋め込んで、複数の極を形成した永久磁石埋込式回転電機において、
前記２つの永久磁石を保持する２つの第１保持穴部と、前記２つの第１保持穴部同士の間に配置され、各第１保持穴部と各々連通する２つの第１空洞部と、隣接する他極との間に配置され、各第１保持穴部と各々連通する２つの第２空洞部とを、前記一極分として複数組形成した第１積層鋼板と、
前記２つの第１保持穴部と同等の２つの第２保持穴部と、前記２つの第１空洞部と同等の２つの第３空洞部と、前記第２空洞部と重なるように配置され、各第２保持穴部と各々連通すると共に外縁まで通じる２つの切欠部とを、前記一極分として複数組形成した第２積層鋼板とを有し、
前記第１積層鋼板と前記第２積層鋼板とを、１枚ずつ又は数枚単位で交互に積層して、前記回転子の鉄心部分を構成したことを特徴とする。 A permanent magnet embedded rotary electric machine according to a first invention for solving the above-mentioned problems is as follows.
A permanent magnet embedded having a plurality of poles formed by embedding a plurality of sets of the two permanent magnets inside the rotor, with two permanent magnets arranged so as to spread outward or inward of the rotor as one pole. In a built-in rotating electrical machine,
Two first holding holes for holding the two permanent magnets, two first cavities disposed between the two first holding holes and communicating with the first holding holes, respectively. A first laminated steel sheet that is arranged between the adjacent other poles and that forms a plurality of sets of two second cavities each communicating with each first holding hole as the one pole;
Two second holding hole parts equivalent to the two first holding hole parts, two third cavity parts equivalent to the two first cavity parts, and the second cavity part, A second laminated steel sheet in which a plurality of sets of two notch portions communicating with each second holding hole portion and leading to the outer edge are formed as the one pole,
The first laminated steel plate and the second laminated steel plate are alternately laminated one by one or in units of several sheets to constitute an iron core portion of the rotor.

上記課題を解決する第２の発明に係る永久磁石埋込式回転電機は、
回転子の外側又は内側に向かって広がるように配置した２つの永久磁石を一極分として、前記２つの永久磁石を前記回転子の内部に複数組埋め込んで、複数の極を形成した永久磁石埋込式回転電機において、
前記２つの永久磁石を保持する２つの第１保持穴部と、前記２つの第１保持穴部同士の間に配置され、各第１保持穴部と各々連通する２つの第１空洞部と、隣接する一方の他極との間に配置され、前記一方側の第１保持穴部と連通する１つの第２空洞部と、隣接する他方の他極との間に配置され、前記他方側の第１保持穴部と連通すると共に外縁まで通じる１つの第１切欠部とを、前記一極分として複数組形成した第１積層鋼板と、
前記２つの第１保持穴部と同等の２つの第２保持穴部と、前記２つの第１空洞部と同等の２つの第３空洞部と、前記第２空洞部と重なるように配置され、前記一方側の第２保持穴部と連通すると共に外縁まで通じる１つの第２切欠部と、前記第１切欠部と重なるように配置され、前記他方側の第２保持穴部と連通する１つの第４空洞部とを、前記一極分として複数組形成した第２積層鋼板とを有し、
前記第１積層鋼板と前記第２積層鋼板とを、１枚ずつ又は数枚単位で交互に積層して、前記回転子の鉄心部分を構成したことを特徴とする。 A permanent magnet embedded rotary electric machine according to a second invention for solving the above-mentioned problems is as follows.
A permanent magnet embedded having a plurality of poles formed by embedding a plurality of sets of the two permanent magnets inside the rotor, with two permanent magnets arranged so as to spread outward or inward of the rotor as one pole. In a built-in rotating electrical machine,
Two first holding holes for holding the two permanent magnets, two first cavities disposed between the two first holding holes and communicating with the first holding holes, respectively. Arranged between one other adjacent pole and one second cavity communicating with the first holding hole on the one side and the other other adjacent pole, the other side A first laminated steel sheet in which a plurality of sets of one first cutout portion communicating with the first holding hole portion and leading to the outer edge are formed as the one pole,
Two second holding hole parts equivalent to the two first holding hole parts, two third cavity parts equivalent to the two first cavity parts, and the second cavity part, One second cutout portion communicating with the second holding hole portion on the one side and leading to the outer edge, and one second cutout portion arranged so as to overlap the first cutout portion and communicating with the second holding hole portion on the other side A second laminated steel sheet in which a plurality of fourth hollow portions are formed as a single pole, and
The first laminated steel plate and the second laminated steel plate are alternately laminated one by one or in units of several sheets to constitute an iron core portion of the rotor.

上記課題を解決する第３の発明に係る永久磁石埋込式回転電機は、
回転子の外側又は内側に向かって広がるように配置した２つの永久磁石を一極分として、前記２つの永久磁石を前記回転子の内部に複数組埋め込んで、複数の極を形成した永久磁石埋込式回転電機において、
前記２つの永久磁石を保持する２つの第１保持穴部と、前記２つの第１保持穴部同士を連通する１つの第１空洞部と、隣接する他極との間に配置され、各第１保持穴部と各々連通する２つの第２空洞部とを、前記一極分として複数組形成した第１積層鋼板と、
前記２つの第１保持穴部と同等の２つの第２保持穴部と、前記２つの第２保持穴部同士の間に配置され、各第２保持穴部と各々連通する２つの第３空洞部と、前記第２空洞部と重なるように配置され、各第２保持穴部と各々連通すると共に外縁まで通じる２つの切欠部とを、前記一極分として複数組形成した第２積層鋼板とを有し、
前記第１積層鋼板と前記第２積層鋼板とを、１枚ずつ又は数枚単位で交互に積層して、前記回転子の鉄心部分を構成したことを特徴とする。 A permanent magnet embedded rotary electric machine according to a third invention for solving the above-described problems is
A permanent magnet embedded having a plurality of poles formed by embedding a plurality of sets of the two permanent magnets inside the rotor, with two permanent magnets arranged so as to spread outward or inward of the rotor as one pole. In a built-in rotating electrical machine,
Arranged between two first holding holes for holding the two permanent magnets, one first cavity communicating with the two first holding holes, and an adjacent other pole, A first laminated steel sheet in which a plurality of sets of two second cavities each communicating with one holding hole are formed as one pole; and
Two second holding holes equivalent to the two first holding holes, and two third cavities disposed between the two second holding holes and communicating with the second holding holes, respectively. And a second laminated steel sheet in which a plurality of sets of two notch portions that are arranged so as to overlap the second cavity portion and communicate with each second holding hole portion and to the outer edge are formed as one pole. Have
The first laminated steel plate and the second laminated steel plate are alternately laminated one by one or in units of several sheets to constitute an iron core portion of the rotor.

上記課題を解決する第４の発明に係る永久磁石埋込式回転電機は、
回転子の外側又は内側に向かって広がるように配置した２つの永久磁石を一極分として、前記２つの永久磁石を前記回転子の内部に複数組埋め込んで、複数の極を形成した永久磁石埋込式回転電機において、
前記２つの永久磁石を保持する２つの第１保持穴部と、前記２つの第１保持穴部同士を連通する１つの第１空洞部と、隣接する他極との間に配置され、各第１保持穴部と各々連通する２つの第２空洞部とを、前記一極分として複数組形成した第１積層鋼板と、
前記２つの第１保持穴部と同等の２つの第２保持穴部と、前記第２空洞部と重なるように配置され、各第２保持穴部と各々連通すると共に外縁まで通じる２つの切欠部とを、前記一極分として複数組形成した第２積層鋼板とを有し、
前記第１積層鋼板と前記第２積層鋼板とを、１枚ずつ又は数枚単位で交互に積層して、前記回転子の鉄心部分を構成したことを特徴とする。 A permanent magnet embedded rotary electric machine according to a fourth invention for solving the above-described problems is
A permanent magnet embedded having a plurality of poles formed by embedding a plurality of sets of the two permanent magnets inside the rotor, with two permanent magnets arranged so as to spread outward or inward of the rotor as one pole. In a built-in rotating electrical machine,
Arranged between two first holding holes for holding the two permanent magnets, one first cavity communicating with the two first holding holes, and an adjacent other pole, A first laminated steel sheet in which a plurality of sets of two second cavities each communicating with one holding hole are formed as one pole; and
Two second holding hole portions that are equivalent to the two first holding hole portions, and two cutout portions that are arranged so as to overlap the second cavity portion and communicate with each second holding hole portion and to the outer edge. And a second laminated steel sheet formed as a plurality of sets as the one pole,
The first laminated steel plate and the second laminated steel plate are alternately laminated one by one or in units of several sheets to constitute an iron core portion of the rotor.

本発明によれば、回転子の鉄心部分を、第１積層鋼板と第２積層鋼板とを１枚ずつ又は数枚単位で交互に積層して構成すると共に、永久磁石の保持穴部から積層鋼板の外縁まで通じる切欠部を、一方の積層鋼板側に、又は、両積層鋼板の永久磁石の互いに異なる端部側に形成したので、第２空洞部、第４空洞部から積層鋼板の外縁までの距離（外縁支持部の幅）を細くせずに従来と同じ距離としても、打ち抜き加工性、鉄心強度を確保したまま、磁気特性を向上させることができる。又、第２空洞部、第４空洞部から積層鋼板の外縁までの距離（外縁支持部の幅）を広くすることもでき、その場合には、所望の磁気特性を確保したまま、打ち抜き加工性、鉄心強度を向上させることができる。   According to the present invention, the iron core portion of the rotor is formed by alternately laminating the first laminated steel plate and the second laminated steel plate one by one or in units of several sheets, and from the holding hole of the permanent magnet to the laminated steel plate. Since the notch portion leading to the outer edge of the laminated steel plate is formed on one laminated steel plate side or on different end sides of the permanent magnets of both laminated steel plates, the second cavity portion, the fourth cavity portion to the outer edge of the laminated steel plate Even if the distance (the width of the outer edge support portion) is not reduced and the distance is the same as the conventional distance, the magnetic characteristics can be improved while the punching workability and the iron core strength are secured. In addition, the distance from the second cavity part and the fourth cavity part to the outer edge of the laminated steel sheet (the width of the outer edge support part) can be increased. In this case, the punching workability is maintained while ensuring the desired magnetic properties. , Iron core strength can be improved.

本発明に係る永久磁石埋込式回転電機の実施形態の一例（実施例１）を示すものであり、（ａ）は、ロータの断面図、（ｂ）は、ロータの他の断面図、（ｃ）は、ロータの外周面図である。BRIEF DESCRIPTION OF THE DRAWINGS An example (Example 1) of embodiment of the permanent-magnet embedded rotary electric machine which concerns on this invention is shown, (a) is sectional drawing of a rotor, (b) is other sectional drawing of a rotor, c) is an outer peripheral view of the rotor. 本発明に係る永久磁石埋込式回転電機の実施形態の他の一例（実施例２）を示すものであり、（ａ）は、ロータの断面図、（ｂ）は、ロータの他の断面図、（ｃ）は、ロータの外周面図である。The other example (Example 2) of embodiment of the permanent magnet embedding type rotary electric machine which concerns on this invention is shown, (a) is sectional drawing of a rotor, (b) is other sectional drawing of a rotor. (C) is an outer peripheral view of a rotor. 本発明に係る永久磁石埋込式回転電機の実施形態の他の一例（実施例３）を示すものであり、（ａ）は、ロータの断面図、（ｂ）は、ロータの他の断面図、（ｃ）は、ロータの外周面図である。The other example (Example 3) of embodiment of the permanent magnet embedded rotary electric machine which concerns on this invention is shown, (a) is sectional drawing of a rotor, (b) is other sectional drawing of a rotor. (C) is an outer peripheral view of a rotor. 図３（ｂ）に示したロータの変形例を示す断面図である。It is sectional drawing which shows the modification of the rotor shown in FIG.3 (b). 従来の永久磁石埋込式回転電機のロータの断面を示す図である。It is a figure which shows the cross section of the rotor of the conventional permanent magnet embedded rotary electric machine. 他の従来の永久磁石埋込式回転電機のロータの断面を示す図である。It is a figure which shows the cross section of the rotor of another conventional permanent magnet embedded rotary electric machine.

本発明に係る永久磁石埋込式回転電機（ＩＰＭモータ）について、図１〜図４を参照して、その実施形態を説明する。なお、本発明は、ＩＰＭモータのロータ部分に特徴があるため、図１〜図４では、ロータの断面、外周面を図示し、他の構成要素の図示は省略している。   An embodiment of an embedded permanent magnet rotating electrical machine (IPM motor) according to the present invention will be described with reference to FIGS. In addition, since this invention has the characteristics in the rotor part of an IPM motor, in FIG. 1-4, the cross section of a rotor and the outer peripheral surface are shown in figure, and illustration of other components is abbreviate | omitted.

（実施例１）
図１（ａ）、図１（ｂ）は、本実施例のＩＰＭモータのロータの断面図であり、図１（ｃ）は、その外周面図である。本実施例のＩＰＭモータは、ロータ１０の外側に向かって広がるようにＶ字状に配置した２つの永久磁石１３ａ、１３ｂを一極分とするものであり、２つの永久磁石１３ａ、１３ｂをロータ１０の内部に複数組埋め込んで、複数の極を形成したものである。又、ロータ１０は、図１（ａ）、図１（ｂ）に示す２種類の積層鋼板１１（第１積層鋼板）、積層鋼板１２（第２積層鋼板）を、一枚ずつ又は数枚単位で交互に積層して、ロータ１０の鉄心部分として構成したものである。 Example 1
1A and 1B are cross-sectional views of the rotor of the IPM motor of this embodiment, and FIG. 1C is an outer peripheral view thereof. The IPM motor of this embodiment uses two permanent magnets 13a and 13b arranged in a V shape so as to spread toward the outside of the rotor 10 as one pole, and the two permanent magnets 13a and 13b are used as a rotor. A plurality of sets are embedded in 10 to form a plurality of poles. The rotor 10 includes two types of laminated steel plates 11 (first laminated steel plates) and laminated steel plates 12 (second laminated steel plates) shown in FIG. 1A and FIG. Are alternately laminated and configured as an iron core portion of the rotor 10.

積層鋼板１１には、一極分として、２つの保持穴部１８ａ、１８ｂ（第１保持穴部）と、２つの空洞部１４ａ、１４ｂ（第１空洞部）と、２つの空洞部１５ａ、１５ｂ（第２空洞部）とを形成し、これらを複数組形成している。具体的には、一極分として、Ｖ字状に配置され、２つの永久磁石１３ａ、１３ｂを保持する２つの保持穴部１８ａ、１８ｂと、２つの保持穴部１８ａ、１８ｂ同士の間の部分（Ｖ字の中央部分）に配置され、各保持穴部１８ａ、１８ｂと各々連通する２つの空洞部１４ａ、１４ｂと、隣接する他極との間の部分（Ｖ字の端部分）に配置され、各保持穴部１８ａ、１８ｂと各々連通する２つの空洞部１５ａ、１５ｂとを形成している。   The laminated steel sheet 11 has two holding holes 18a and 18b (first holding holes), two cavities 14a and 14b (first cavities), and two cavities 15a and 15b as one pole. (Second cavity) are formed, and a plurality of these are formed. Specifically, as one pole portion, it is arranged in a V shape and is a portion between the two holding hole portions 18a and 18b holding the two permanent magnets 13a and 13b and the two holding hole portions 18a and 18b. (V-shaped central portion) and disposed in the portion (V-shaped end portion) between the two hollow portions 14a and 14b communicating with the holding hole portions 18a and 18b, respectively, and the adjacent other poles. Two hollow portions 15a and 15b communicating with the holding hole portions 18a and 18b are formed.

保持穴部１８ａ、空洞部１４ａ、空洞部１５ａは、連続した１つの領域（穴）となっており、又、保持穴部１８ｂ、空洞部１４ｂ、空洞部１５ｂも、連続した１つの領域（穴）となっており、積層鋼板１１の打ち抜き加工時には、各々、１つの穴として打ち抜けばよい。打ち抜き加工により、空洞部１５ａ、１５ｂの外縁側に外縁支持部１９ａ、１９ｂが形成されることになる。なお、打ち抜き加工された積層鋼板１１は、図５に示した従来の積層鋼板４１と同じ形状であるが、本実施例では、後述する理由により、磁気特性を向上させることができる。   The holding hole 18a, the cavity 14a, and the cavity 15a are one continuous region (hole), and the holding hole 18b, the cavity 14b, and the cavity 15b are also one continuous region (hole). In the punching process of the laminated steel sheet 11, each may be punched as one hole. Outer edge support portions 19a and 19b are formed on the outer edge sides of the hollow portions 15a and 15b by punching. The punched laminated steel plate 11 has the same shape as the conventional laminated steel plate 41 shown in FIG. 5, but in this embodiment, the magnetic properties can be improved for the reasons described later.

又、積層鋼板１２には、一極分として、２つの保持穴部１８ａ’、１８ｂ’（第２保持穴部）と、２つの空洞部１４ａ’、１４ｂ’（第３空洞部）と、２つの切欠部１６ａ、１６ｂとを形成し、これらを複数組形成している。積層鋼板１２における保持穴部１８ａ’、１８ｂ’、空洞部１４ａ’、１４ｂ’は、各々、積層鋼板１１における保持穴部１８ａ、１８ｂ、空洞部１４ａ、１４ｂと同等のものである。具体的には、一極分として、Ｖ字状に配置され、２つの永久磁石１３ａ、１３ｂを保持する２つの保持穴部１８ａ’、１８ｂ’と、２つの保持穴部１８ａ’、１８ｂ’同士の間の部分（Ｖ字の中央部分）に配置され、各保持穴部１８ａ’、１８ｂ’と各々連通する２つの空洞部１４ａ’、１４ｂ’と、各空洞部１５ａ、１５ｂと各々重なるように配置され、各保持穴部１８ａ’、１８ｂ’と各々連通すると共に積層鋼板１２の外縁まで通じる２つの切欠部１６ａ、１６ｂとを形成している。各切欠部１６ａ、１６ｂは、各空洞部１５ａ、１５ｂを各々内部に含むように配置されており、これにより、各空洞部１５ａ、１５ｂと各々重なるように配置される。   The laminated steel sheet 12 has two holding holes 18a 'and 18b' (second holding holes), two cavities 14a 'and 14b' (third cavities), 2 Two notches 16a and 16b are formed, and a plurality of these are formed. The holding hole portions 18a 'and 18b' and the cavity portions 14a 'and 14b' in the laminated steel plate 12 are the same as the holding hole portions 18a and 18b and the cavity portions 14a and 14b in the laminated steel plate 11, respectively. Specifically, two holding holes 18a 'and 18b' that hold the two permanent magnets 13a and 13b and two holding holes 18a 'and 18b' are arranged as a single pole. Between the two hollow portions 14a 'and 14b' respectively communicating with the holding hole portions 18a 'and 18b', and overlapping the respective hollow portions 15a and 15b. The two cutout portions 16 a and 16 b are arranged and communicate with the holding hole portions 18 a ′ and 18 b ′ and communicate with the outer edge of the laminated steel plate 12. Each notch part 16a, 16b is arrange | positioned so that each cavity part 15a, 15b may each be included inside, and, thereby, it arrange | positions so that it may each overlap with each cavity part 15a, 15b.

保持穴部１８ａ’、空洞部１４ａ’、切欠部１６ａは、連続した１つの領域（切り欠き）となっており、又、保持穴部１８ｂ’、空洞部１４ｂ’、切欠部１６ｂも、連続した１つの領域（切り欠き）となっており、積層鋼板１２の打ち抜き加工時には、各々、１つの切り欠きとして打ち抜けばよい。   The holding hole 18a ′, the cavity 14a ′, and the notch 16a are one continuous region (notch), and the holding hole 18b ′, the cavity 14b ′, and the notch 16b are also continuous. One region (notch) is formed, and each of the laminated steel plates 12 may be punched out as one notch at the time of punching.

そして、上記積層鋼板１１、１２を一枚ずつ交互に積層した場合には、ロータ１０の外周面は、図１（ｃ）に示す外観となり、切欠部１６ａ、１６ｂが各々列になって、積層鋼板１枚おきに配置されることになる。   When the laminated steel plates 11 and 12 are alternately laminated one by one, the outer peripheral surface of the rotor 10 has the appearance shown in FIG. 1 (c), and the notches 16a and 16b are arranged in rows. Every other steel plate is arranged.

本実施例においては、積層鋼板１１と積層鋼板１２とを交互積層しており、積層鋼板１２においては、磁束が切欠部１６ａ、１６ｂを通過することになるので、積層鋼板１１においては、外縁支持部１９ａ、１９ｂの幅を細くしなくても、磁気短絡を低減することができる。具体的には、ロータ鉄心が積層鋼板４１のみで構成された従来の場合と比較して、本実施例の場合は、積層鋼板１２に切欠部１６ａ、１６ｂが有るため、各鋼板における永久磁石とロータ外周面との間の鉄心の断面積を総計した総断面積（即ち、外縁支持部１９ａ、１９ｂの部分の断面積を総計した総断面積）が１／２となり、その結果、磁気短絡を低減することになる。   In the present embodiment, the laminated steel plates 11 and the laminated steel plates 12 are alternately laminated, and in the laminated steel plates 12, the magnetic flux passes through the notches 16a and 16b. Even if the widths of the portions 19a and 19b are not narrowed, the magnetic short circuit can be reduced. Specifically, compared with the conventional case in which the rotor iron core is composed only of the laminated steel plate 41, in this embodiment, the laminated steel plate 12 has the notches 16a and 16b. The total cross-sectional area obtained by summing the cross-sectional areas of the iron core between the rotor outer peripheral surfaces (that is, the total cross-sectional area obtained by summing the cross-sectional areas of the outer edge support portions 19a and 19b) is halved. Will be reduced.

又、積層鋼板１２においては、隣接する他極との間の部位に切欠部１６ａ、１６ｂが形成され、鉄心が存在しないため、切欠部１６ａ、１６ｂにおける磁気抵抗を、外縁支持部１９ａ、１９ｂにおける磁気抵抗よりも大きくすることができる。そして、積層鋼板１１と積層鋼板１２とを交互積層しているので、積層鋼板１１のみを用いた場合よりも磁気抵抗を大きくすることができる。従って、切欠部１６ａ、１６ｂにおける磁気短絡の低減により、磁束漏れを抑制して、多くの磁束をステータ側に供給でき、モータ効率の向上を図ることができる。更に、積層鋼板１２において、ｄ軸磁束、ｑ軸磁束の通過部分には鉄心が存在しているので、所望のリラクタンストルクを維持することができる。   Further, in the laminated steel sheet 12, since the notches 16a and 16b are formed in the portion between the adjacent other poles, and the iron core does not exist, the magnetic resistance in the notches 16a and 16b is reduced in the outer edge support portions 19a and 19b. It can be made larger than the magnetic resistance. And since the laminated steel plate 11 and the laminated steel plate 12 are laminated | stacked alternately, a magnetic resistance can be enlarged rather than the case where only the laminated steel plate 11 is used. Therefore, by reducing the magnetic short circuit in the notches 16a and 16b, magnetic flux leakage can be suppressed and a large amount of magnetic flux can be supplied to the stator side, so that the motor efficiency can be improved. Furthermore, in the laminated steel sheet 12, since the iron core is present in the passing portion of the d-axis magnetic flux and the q-axis magnetic flux, a desired reluctance torque can be maintained.

上記構成により、打ち抜き加工性や耐遠心力性のために、外縁支持部１９ａ、１９ｂを所定の幅とする必要がある場合でも、切欠部１６ａ、１６ｂの存在により、外縁支持部１９ａ、１９ｂの幅として、所定の幅を確保しつつ、磁気抵抗を大きくして、磁束漏れを抑制することができる。   With the above configuration, even when the outer edge support portions 19a and 19b need to have a predetermined width for punching workability and centrifugal resistance, the presence of the notches 16a and 16b causes the outer edge support portions 19a and 19b to As the width, it is possible to suppress magnetic flux leakage by increasing the magnetic resistance while ensuring a predetermined width.

例えば、外縁支持部１９ａ、１９ｂの幅を従来（図５における外縁支持部４９参照）と同じ幅にした場合には、ロータ鉄心が積層鋼板４１のみで構成された従来の場合と比較して、打ち抜き加工時の変形を抑制できる従来と同程度の打ち抜き加工性を確保することができ、又、永久磁石１３ａ、１３ｂに働く遠心力に対する鉄心強度を確保することができ、同時に、磁気特性を向上させることができる。   For example, when the width of the outer edge support portions 19a, 19b is the same as the conventional width (see the outer edge support portion 49 in FIG. 5), compared to the conventional case where the rotor core is composed of only the laminated steel plate 41, It is possible to ensure the same punching workability as before, which can suppress deformation during punching, and to secure the iron core strength against the centrifugal force acting on the permanent magnets 13a, 13b, and at the same time improve the magnetic characteristics Can be made.

又、積層鋼板１２に切欠部１６ａ、１６ｂが有るため、外縁支持部１９ａ、１９ｂの幅を広くすることもでき、その場合には、所望の磁気特性を確保したまま、打ち抜き加工性、鉄心強度を向上させることができる。例えば、外縁支持部１９ａ、１９ｂの幅を従来（図５における外縁支持部４９参照）の２倍の幅にした場合には、ロータ鉄心が積層鋼板４１のみで構成された従来の場合と同等の磁気特性を確保したまま、打ち抜き加工性、鉄心強度は向上することになる。   In addition, since the laminated steel sheet 12 has the notches 16a and 16b, the width of the outer edge support portions 19a and 19b can be increased. In this case, the punching workability and the iron core strength can be maintained while ensuring the desired magnetic characteristics. Can be improved. For example, when the width of the outer edge support portions 19a and 19b is twice that of the conventional one (see the outer edge support portion 49 in FIG. 5), the rotor iron core is equivalent to the conventional case in which only the laminated steel plate 41 is configured. The punching workability and the iron core strength are improved while maintaining the magnetic properties.

（実施例２）
図２（ａ）、図２（ｂ）は、本実施例のＩＰＭモータのロータの断面図であり、図２（ｃ）は、その外周面図である。本実施例のＩＰＭモータも、実施例１と同様に、ロータ２０の外側に向かって広がるようにＶ字状に配置した２つの永久磁石２３ａ、２３ｂを一極分とするものであり、２つの永久磁石２３ａ、２３ｂをロータ２０の内部に複数組埋め込んで、複数の極を形成したものである。又、ロータ２０は、図２（ａ）、図２（ｂ）に示す２種類の積層鋼板２１（第１積層鋼板）、積層鋼板２２（第２積層鋼板）を、一枚ずつ又は数枚単位で交互に積層して、ロータ２０の鉄心部分として構成したものである。 (Example 2)
2 (a) and 2 (b) are cross-sectional views of the rotor of the IPM motor of this embodiment, and FIG. 2 (c) is an outer peripheral view thereof. Similarly to the first embodiment, the IPM motor of the present embodiment also includes two permanent magnets 23a and 23b arranged in a V shape so as to spread toward the outside of the rotor 20, A plurality of permanent magnets 23 a and 23 b are embedded in the rotor 20 to form a plurality of poles. The rotor 20 includes two types of laminated steel plates 21 (first laminated steel plates) and laminated steel plates 22 (second laminated steel plates) shown in FIG. 2A and FIG. Are alternately laminated and configured as an iron core portion of the rotor 20.

積層鋼板２１には、一極分として、２つの保持穴部２８ａ、２８ｂ（第１保持穴部）と、２つの空洞部２４ａ、２４ｂ（第１空洞部）と、１つの空洞部２５ａ（第２空洞部）と、１つの切欠部２６ｂ（第１切欠部）とを形成し、これらを複数組形成している。具体的には、一極分として、Ｖ字状に配置され、２つの永久磁石２３ａ、２３ｂを保持する２つの保持穴部２８ａ、２８ｂと、２つの保持穴部２８ａ、２８ｂ同士間の部分（Ｖ字の中央部分）に配置され、各保持穴部２８ａ、２８ｂと各々連通する２つの空洞部２４ａ、２４ｂと、隣接する一方の他極との間の部分（Ｖ字の一方の端部分）に配置され、一方側の保持穴部２８ａと連通する１つの空洞部２５ａと、隣接する他方の他極との間の部分（Ｖ字の他方の端部分）に配置され、他方側の保持穴部２８ｂと連通すると共に積層鋼板２２の外縁まで通じる１つの切欠部２６ｂとを形成している。   The laminated steel sheet 21 has two holding holes 28a, 28b (first holding holes), two cavities 24a, 24b (first cavities), and one cavity 25a (first cavities) as one pole. 2 cavities) and one notch 26b (first notch) are formed, and a plurality of these are formed. Specifically, as one pole portion, the two holding hole portions 28a and 28b that are arranged in a V shape and hold the two permanent magnets 23a and 23b, and a portion between the two holding hole portions 28a and 28b ( V-shaped central portion) and the portion between the two hollow portions 24a and 24b communicating with the holding hole portions 28a and 28b, respectively, and one adjacent other pole (one end portion of the V-shape) Is disposed in a portion between one hollow portion 25a communicating with the holding hole portion 28a on one side and the other pole adjacent to the other (the other end portion of the V-shape), and the holding hole on the other side One cutout portion 26 b that communicates with the portion 28 b and communicates with the outer edge of the laminated steel plate 22 is formed.

保持穴部２８ａ、空洞部２４ａ、空洞部２５ａは、連続した１つの領域（穴）となっており、又、保持穴部２８ｂ、空洞部２４ｂ、切欠部２６ｂは、連続した１つの領域（切り欠き）となっており、積層鋼板２１の打ち抜き加工時には、各々、１つの穴、１つの切り欠きとして打ち抜けばよい。打ち抜き加工により、空洞部２５ａの外縁側に外縁支持部２９ａが形成されることになる。   The holding hole 28a, the cavity 24a, and the cavity 25a are one continuous area (hole), and the holding hole 28b, the cavity 24b, and the notch 26b are one continuous area (cut). In the punching process of the laminated steel sheet 21, it is sufficient to punch out as one hole and one notch, respectively. By punching, the outer edge support portion 29a is formed on the outer edge side of the cavity portion 25a.

又、積層鋼板２２には、一極分として、２つの保持穴部２８ａ’、２８ｂ’（第２保持穴部）と、２つの空洞部２４ａ’、２４ｂ’（第３空洞部）と、１つの切欠部２６ａ（第２切欠部）と、１つの空洞部２５ｂ（第４空洞部）とを形成し、これらを複数組形成している。積層鋼板２２における保持穴部２８ａ’、２８ｂ’、空洞部２４ａ’、２４ｂ’は、各々、積層鋼板２１における保持穴部２８ａ、２８ｂ、空洞部２４ａ、２４ｂと同等のものである。具体的には、一極分として、Ｖ字状に配置され、２つの永久磁石２３ａ、２３ｂを保持する２つの保持穴部２８ａ’、２８ｂ’と、２つの保持穴部２８ａ’、２８ｂ’同士の間の部分（Ｖ字の中央部分）に配置され、各保持穴部２８ａ’、２８ｂ’と各々連通する２つの空洞部２４ａ’、２４ｂ’と、空洞部２５ａと重なるように配置され、一方側の保持穴部２８ａ’と連通すると共に積層鋼板２２の外縁まで通じる１つの切欠部２６ａと、切欠部２６ｂと重なるように配置され、他方側の保持穴部２８ｂ’と連通する１つの空洞部２５ｂとを形成している。切欠部２６ａは、空洞部２５ａを内部に含むように配置されており、これにより、空洞部２５ａと重なるように配置される。一方、空洞部２５ｂは、切欠部２６ｂの内部に含まれるように配置されており、これにより、切欠部２６ｂと重なるように配置される。   The laminated steel sheet 22 has two holding holes 28a 'and 28b' (second holding holes), two cavities 24a 'and 24b' (third cavities), 1 One notch 26a (second notch) and one cavity 25b (fourth cavity) are formed, and a plurality of sets are formed. The holding hole portions 28 a ′ and 28 b ′ and the hollow portions 24 a ′ and 24 b ′ in the laminated steel plate 22 are the same as the holding hole portions 28 a and 28 b and the hollow portions 24 a and 24 b in the laminated steel plate 21, respectively. Specifically, two holding holes 28a ′ and 28b ′ that hold the two permanent magnets 23a and 23b, and the two holding holes 28a ′ and 28b ′ are arranged in a V shape as one pole. Between the two cavity portions 24a ′ and 24b ′ respectively communicating with the holding hole portions 28a ′ and 28b ′ and the cavity portion 25a. One notch portion 26a that communicates with the holding hole portion 28a 'on the side and communicates with the outer edge of the laminated steel plate 22, and one hollow portion that is disposed so as to overlap the notch portion 26b and communicates with the other holding hole portion 28b' 25b. The notch 26a is disposed so as to include the cavity 25a therein, and is thereby disposed so as to overlap the cavity 25a. On the other hand, the hollow portion 25b is disposed so as to be included in the notch portion 26b, and is thereby disposed so as to overlap the notch portion 26b.

保持穴部２８ａ’、空洞部２４ａ’、切欠部２６ａは、連続した１つの領域（切り欠き）となっており、又、保持穴部２８ｂ’、空洞部２４ｂ’、空洞部２５ｂは、連続した１つの領域（穴）となっており、積層鋼板２２の打ち抜き加工時には、各々、１つの切り欠き、１つの穴として打ち抜けばよい。打ち抜き加工により、空洞部２５ｂの外縁側に外縁支持部２９ｂが形成されることになる。このように、積層鋼板２２は、積層鋼板２１と略同じ構成であるが、空洞部２５ａ及び切欠部２６ｂと空洞部２５ｂ及び切欠部２６ａとの配置が逆になっている。   The holding hole 28a ′, the cavity 24a ′, and the notch 26a are one continuous region (notch), and the holding hole 28b ′, the cavity 24b ′, and the cavity 25b are continuous. One region (hole) is formed, and when the laminated steel plate 22 is punched, it may be punched out as one notch and one hole, respectively. By the punching process, the outer edge support portion 29b is formed on the outer edge side of the cavity portion 25b. Thus, the laminated steel plate 22 has substantially the same configuration as the laminated steel plate 21, but the arrangement of the cavity portion 25a and the notch portion 26b and the cavity portion 25b and the notch portion 26a is reversed.

そして、上記積層鋼板２１、２２を一枚ずつ交互に積層した場合には、ロータ２０の外周面は、図２（ｃ）に示す外観となり、切欠部２６ａ、２６ｂが各々列となって、積層鋼板１枚毎に切欠部２６ａ、２６ｂが交互に配置されることになるが、各列においては、積層鋼板１枚おきに切欠部２６ａ、２６ｂが配置されることになる。   When the laminated steel plates 21 and 22 are alternately laminated one by one, the outer peripheral surface of the rotor 20 has the appearance shown in FIG. 2C, and the notches 26a and 26b are arranged in rows, respectively. Notches 26a and 26b are alternately arranged for each steel plate, but in each row, notches 26a and 26b are arranged every other laminated steel plate.

本実施例においても、実施例１と同様の効果を得ることができる。又、実施例１で示した積層鋼板１２では、この積層鋼板１２を扱う際、空洞部１４ａ、１４ｂ間の中央支持部１９ｃが折れてしまうおそれがあるが、本実施例では、積層鋼板２１においては、空洞部２４ａ、２４ｂ間の中央支持部２９ｃと外縁支持部２９ａとの２箇所、積層鋼板２２においては、空洞部２４ａ’、２４ｂ’間の中央支持部２９ｃと外縁支持部２９ｂとの２箇所で、永久磁石２３ａ、２３ｂの外周側にある鉄心部位をつなぎ留めているため、折れてしまう可能性が低減し、作業性が良くなる。   Also in this embodiment, the same effect as that of Embodiment 1 can be obtained. Moreover, in the laminated steel plate 12 shown in Example 1, when this laminated steel plate 12 is handled, there is a possibility that the central support portion 19c between the hollow portions 14a and 14b may be broken. Are the central support part 29c and the outer edge support part 29a between the cavity parts 24a and 24b, and in the laminated steel plate 22, the center support part 29c and the outer edge support part 29b between the cavity parts 24a 'and 24b' Since the iron core part on the outer peripheral side of the permanent magnets 23a and 23b is connected at the place, the possibility of breakage is reduced and workability is improved.

（実施例３）
図３（ａ）、図３（ｂ）は、本実施例のＩＰＭモータのロータの断面図であり、図３（ｃ）は、その外周面図である。本実施例のＩＰＭモータも、実施例１、２と同様に、ロータ３０の外側に向かって広がるようにＶ字状に配置した２つの永久磁石３３ａ、３３ｂを一極分とするものであり、２つの永久磁石３３ａ、３３ｂをロータ３０の内部に複数組埋め込んで、複数の極を形成したものである。又、ロータ３０は、図３（ａ）、図３（ｂ）に示す２種類の積層鋼板３１（第１積層鋼板）、積層鋼板３２（第２積層鋼板）を、一枚ずつ又は数枚単位で交互に積層して、ロータ３０の鉄心部分として構成したものである。 (Example 3)
3A and 3B are cross-sectional views of the rotor of the IPM motor of this embodiment, and FIG. 3C is an outer peripheral view thereof. Similarly to the first and second embodiments, the IPM motor of the present embodiment also includes two permanent magnets 33a and 33b arranged in a V shape so as to spread toward the outside of the rotor 30. A plurality of sets of two permanent magnets 33 a and 33 b are embedded in the rotor 30 to form a plurality of poles. The rotor 30 includes two types of laminated steel plates 31 (first laminated steel plates) and laminated steel plates 32 (second laminated steel plates) shown in FIGS. 3A and 3B, one by one or several units. Are alternately laminated and configured as an iron core portion of the rotor 30.

積層鋼板３１には、一極分として、２つの保持穴部３８ａ、３８ｂ（第１保持穴部）と、１つの空洞部３７（第１空洞部）と、２つの空洞部３５ａ、３５ｂ（第２空洞部）とを形成し、これらを複数組形成している。具体的には、一極分として、Ｖ字状に配置され、２つの永久磁石３３ａ、３３ｂを保持する２つの保持穴部３８ａ、３８ｂと、２つの保持穴部３８ａ、３８ｂ同士の間の部分（Ｖ字の中央部分）に配置され、保持穴部３８ａ、３８ｂ同士を連通する１つの空洞部３７と、隣接する他極との間の部分（Ｖ字の端部分）に配置され、各保持穴部３８ａ、３８ｂと各々連通する２つの空洞部３５ａ、３５ｂとを形成している。   The laminated steel sheet 31 has two holding holes 38a and 38b (first holding holes), one cavity 37 (first cavity), and two cavities 35a and 35b (first) as one pole. 2 cavities), and a plurality of these are formed. Specifically, as one pole portion, the two holding hole portions 38a and 38b that are arranged in a V shape and hold the two permanent magnets 33a and 33b, and a portion between the two holding hole portions 38a and 38b. (V-shaped central portion), each holding hole 38a, 38b is communicated with each other, and is disposed in a portion (V-shaped end portion) between one hollow portion 37 and another adjacent pole. Two hollow portions 35a and 35b communicating with the hole portions 38a and 38b, respectively, are formed.

空洞部３５ａ、保持穴部３８ａ、空洞部３７、保持穴部３８ｂ、空洞部３５ｂは、連続した１つの領域（穴）となっており、積層鋼板３１の打ち抜き加工時には、１つの穴として打ち抜けばよい。打ち抜き加工により、空洞部３５ａ、３５ｂの外縁側に外縁支持部３９ａ、３９ｂが形成されることになる。この積層鋼板３１は、図５に示した従来の積層鋼板４１と略同じ形状であるが、２つの保持穴部３８ａ、３８ｂの間に形成した空洞部３７の形状が相違している。   The hollow portion 35a, the holding hole portion 38a, the hollow portion 37, the holding hole portion 38b, and the hollow portion 35b are one continuous region (hole), and are punched as one hole when the laminated steel plate 31 is punched. That's fine. Outer edge support portions 39a and 39b are formed on the outer edge sides of the hollow portions 35a and 35b by punching. Although this laminated steel plate 31 has substantially the same shape as the conventional laminated steel plate 41 shown in FIG. 5, the shape of the cavity portion 37 formed between the two holding hole portions 38a and 38b is different.

積層鋼板３２には、一極分として、２つの保持穴部３８ａ’、３８ｂ’（第２保持穴部）と、２つの空洞部３４ａ、３４ｂ（第３空洞部）と、２つの切欠部３６ａ、３６ｂとを形成し、これらを複数組形成している。積層鋼板３２における保持穴部３８ａ’、３８ｂ’は、各々、積層鋼板３１における保持穴部３８ａ、３８ｂと同等のものである。具体的には、一極分として、Ｖ字状に配置され、２つの永久磁石３３ａ、３３ｂを保持する２つの保持穴部３８ａ’、３８ｂ’と、２つの保持穴部３８ａ’、３８ｂ’同士の間の部分（Ｖ字の中央部分）に配置され、各保持穴部３８ａ’、３８ｂ’と各々連通する２つの空洞部３４ａ、３４ｂと、空洞部３５ａ、３５ｂと重なるように配置され、各保持穴部３８ａ’、３８ｂ’と各々連通すると共に積層鋼板３２の外縁まで通じる２つの切欠部３６ａ、３６ｂとを形成している。各切欠部３６ａ、３６ｂは、各空洞部３５ａ、３５ｂを各々内部に含むように配置されており、これにより、各空洞部３５ａ、３５ｂと各々重なるように配置される。   The laminated steel plate 32 has two holding holes 38a ′ and 38b ′ (second holding holes), two cavities 34a and 34b (third cavities), and two notches 36a as one pole. 36b, and a plurality of sets of these are formed. The holding hole portions 38 a ′ and 38 b ′ in the laminated steel plate 32 are the same as the holding hole portions 38 a and 38 b in the laminated steel plate 31, respectively. Specifically, two holding holes 38a ′ and 38b ′ that are arranged in a V shape as one pole and hold the two permanent magnets 33a and 33b, and the two holding holes 38a ′ and 38b ′ Between the two hollow portions 34a and 34b that communicate with the holding hole portions 38a ′ and 38b ′, respectively, and the hollow portions 35a and 35b, respectively. Two cutout portions 36 a and 36 b are formed which communicate with the holding hole portions 38 a ′ and 38 b ′ and communicate with the outer edge of the laminated steel plate 32. The notches 36a and 36b are arranged so as to include the cavities 35a and 35b, respectively, and are arranged so as to overlap the cavities 35a and 35b, respectively.

保持穴部３８ａ’、空洞部３４ａ、切欠部３６ａは、連続した１つの領域（切り欠き）となっており、又、保持穴部３８ｂ’、空洞部３４ｂ、切欠部３６ｂも、連続した１つの領域（切り欠き）となっており、積層鋼板３２の打ち抜き加工時には、各々、１つの切り欠きとして打ち抜けばよい。この積層鋼板３２は、図１（ｂ）に示した積層鋼板１２と同じ形状である。   The holding hole 38a ′, the cavity 34a, and the notch 36a are one continuous region (notch), and the holding hole 38b ′, the cavity 34b, and the notch 36b are also one continuous. It is an area (notch), and each of the laminated steel plates 32 may be punched out as one notch at the time of punching. The laminated steel plate 32 has the same shape as the laminated steel plate 12 shown in FIG.

そして、上記積層鋼板３１、３２を一枚ずつ交互に積層した場合には、ロータ３０の外周面は、図３（ｃ）に示す外観となり、切欠部３６ａ、３６ｂが各々列になって、積層鋼板１枚おきに配置されることになる。   When the laminated steel plates 31 and 32 are alternately laminated one by one, the outer peripheral surface of the rotor 30 has the appearance shown in FIG. 3C, and the cutout portions 36a and 36b are arranged in rows. Every other steel plate is arranged.

本実施例においても、実施例１と同様の効果を得ることができる。又、積層鋼板３１においては、永久磁石３３ａ、３３ｂ間の部位に１つの空洞部３７が形成され、鉄心が存在しないため、空洞部３７における磁気抵抗を、空洞部３４ａ、３４ｂ間の鉄心部位における磁気抵抗よりも大きくすることができる。そして、積層鋼板３１と積層鋼板３２とを交互積層しているので、積層鋼板３２のみを用いた場合よりも磁気抵抗を大きくすることができる。従って、空洞部３７における磁気短絡の低減により、多くの磁束をステータ側に供給でき、モータ効率の向上を更に図ることができる。更に、積層鋼板３２において、ｄ軸磁束、ｑ軸磁束の通過部分には鉄心が存在しているので、リラクタンストルクを維持することができる。   Also in this embodiment, the same effect as that of Embodiment 1 can be obtained. Moreover, in the laminated steel sheet 31, since one cavity 37 is formed in a portion between the permanent magnets 33a and 33b and there is no iron core, the magnetic resistance in the cavity 37 is reduced in the iron core portion between the cavities 34a and 34b. It can be made larger than the magnetic resistance. And since the laminated steel plate 31 and the laminated steel plate 32 are laminated | stacked alternately, a magnetic resistance can be enlarged rather than the case where only the laminated steel plate 32 is used. Therefore, by reducing the magnetic short circuit in the hollow portion 37, a large amount of magnetic flux can be supplied to the stator side, and the motor efficiency can be further improved. Furthermore, in the laminated steel sheet 32, the reluctance torque can be maintained because the iron core is present in the portion where the d-axis magnetic flux and the q-axis magnetic flux pass.

なお、図３（ｂ）に示した積層鋼板３２に替えて、図４に示す積層鋼板３２’（第２積層鋼板）を用いてもよい。積層鋼板３２’は、図３（ｂ）に示した積層鋼板３２と同様に、一極分として、保持穴部３８ａ’、３８ｂ’と、切欠部３６ａ、３６ｂとを有しているが、積層鋼板３２における２つの空洞部３４ａ、３４ｂを形成しておらず、その中央支持部３９ｃと比較して、中央支持部３９ｃ’の幅が広くなっている。中央支持部３９ｃ’の幅を広くすることにより、打ち抜き加工時における変形を抑制することになり、打ち抜き加工性を向上させることができ、又、永久磁石３３ａ、３３ｂに働く遠心力に対する強度も確保することができる。そして、積層鋼板３２’を用いた場合でも、積層鋼板３１と交互積層しているので、上述したように、積層鋼板３２’のみを用いた場合よりも磁気抵抗を大きくすることができ、その結果、モータ効率の向上を図ることができる。   Note that a laminated steel plate 32 ′ (second laminated steel plate) shown in FIG. 4 may be used instead of the laminated steel plate 32 shown in FIG. The laminated steel plate 32 ′ has holding holes 38a ′ and 38b ′ and notches 36a and 36b as one pole, similarly to the laminated steel plate 32 shown in FIG. The two hollow portions 34a and 34b in the steel plate 32 are not formed, and the width of the central support portion 39c ′ is wider than that of the central support portion 39c. By widening the central support portion 39c ', deformation during punching can be suppressed, punching workability can be improved, and strength against centrifugal force acting on the permanent magnets 33a and 33b can be secured. can do. And even when the laminated steel plate 32 ′ is used, since it is alternately laminated with the laminated steel plate 31, as described above, the magnetic resistance can be made larger than when only the laminated steel plate 32 ′ is used, and as a result. The motor efficiency can be improved.

上記実施例１〜３においては、ロータの外側に向かって広がるように配置した（ロータ外側を上とするとＶ字状に配置した）２つの永久磁石を一極分としているが、本発明は、ロータの内側に向かって広がるように配置した（ロータ外側を上とするとハの字状に配置した）２つの永久磁石を一極分とした場合でも、同様の効果を得ることができる。   In the first to third embodiments, two permanent magnets arranged so as to spread toward the outer side of the rotor (arranged in a V shape when the outer side of the rotor is up) are used as one pole. The same effect can be obtained even when two permanent magnets arranged so as to spread toward the inner side of the rotor (arranged in a C shape when the outer side of the rotor is the upper side) are used as one pole.

本発明は、ＩＰＭモータにおけるロータの鉄心形状として好適なものである。   The present invention is suitable as an iron core shape of a rotor in an IPM motor.

１０、２０、３０ ロータ
１１、１２、２１、２２、３１、３２、３２’ 積層鋼板
１３ａ、１３ｂ、２３ａ、２３ｂ、３３ａ、３３ｂ 永久磁石
１４ａ、１４ｂ、１４ａ’、１４ｂ’ 空洞部
２４ａ、２４ｂ、２４ａ’、２４ｂ’ 空洞部
３４ａ、３４ｂ、３７ 空洞部
１５ａ、１５ｂ、２５ａ、２５ｂ、３５ａ、３５ｂ 空洞部
１６ａ、１６ｂ、２６ａ、２６ｂ、３６ａ、３６ｂ 切欠部
１８ａ、１８ｂ、１８ａ’、１８ｂ’ 保持穴部
２８ａ、２８ｂ、２８ａ’、２８ｂ’ 保持穴部
３８ａ、３８ｂ、３８ａ’、３８ｂ’ 保持穴部
１９ａ、１９ｂ、２９ａ、２９ｂ、３９ａ、３９ｂ 外縁支持部
１９ｃ、２９ｃ、３９ｃ、３９ｃ’ 中央支持部 10, 20, 30 Rotor 11, 12, 21, 22, 31, 32, 32 'Laminated steel sheet 13a, 13b, 23a, 23b, 33a, 33b Permanent magnet 14a, 14b, 14a', 14b 'Cavity 24a, 24b, 24a ', 24b' Cavity 34a, 34b, 37 Cavity 15a, 15b, 25a, 25b, 35a, 35b Cavity 16a, 16b, 26a, 26b, 36a, 36b Notch 18a, 18b, 18a ', 18b' Holding Hole 28a, 28b, 28a ', 28b' Holding hole 38a, 38b, 38a ', 38b' Holding hole 19a, 19b, 29a, 29b, 39a, 39b Outer edge support 19c, 29c, 39c, 39c 'Central support Part

Claims (4)

回転子の外側又は内側に向かって広がるように配置した２つの永久磁石を一極分として、前記２つの永久磁石を前記回転子の内部に複数組埋め込んで、複数の極を形成した永久磁石埋込式回転電機において、
前記２つの永久磁石を保持する２つの第１保持穴部と、前記２つの第１保持穴部同士の間に配置され、各第１保持穴部と各々連通する２つの第１空洞部と、隣接する他極との間に配置され、各第１保持穴部と各々連通する２つの第２空洞部とを、前記一極分として複数組形成した第１積層鋼板と、
前記２つの第１保持穴部と同等の２つの第２保持穴部と、前記２つの第１空洞部と同等の２つの第３空洞部と、前記第２空洞部と重なるように配置され、各第２保持穴部と各々連通すると共に外縁まで通じる２つの切欠部とを、前記一極分として複数組形成した第２積層鋼板とを有し、
前記第１積層鋼板と前記第２積層鋼板とを、１枚ずつ又は数枚単位で交互に積層して、前記回転子の鉄心部分を構成したことを特徴とする永久磁石埋込式回転電機。 A permanent magnet embedded having a plurality of poles formed by embedding a plurality of sets of the two permanent magnets inside the rotor, with two permanent magnets arranged so as to spread outward or inward of the rotor as one pole. In a built-in rotating electrical machine,
Two first holding holes for holding the two permanent magnets, two first cavities disposed between the two first holding holes and communicating with the first holding holes, respectively. A first laminated steel sheet that is arranged between the adjacent other poles and that forms a plurality of sets of two second cavities each communicating with each first holding hole as the one pole;
Two second holding hole parts equivalent to the two first holding hole parts, two third cavity parts equivalent to the two first cavity parts, and the second cavity part, A second laminated steel sheet in which a plurality of sets of two notch portions communicating with each second holding hole portion and leading to the outer edge are formed as the one pole,
An embedded permanent magnet rotating electrical machine, wherein the first laminated steel plate and the second laminated steel plate are alternately laminated one by one or in several units to constitute an iron core portion of the rotor. 回転子の外側又は内側に向かって広がるように配置した２つの永久磁石を一極分として、前記２つの永久磁石を前記回転子の内部に複数組埋め込んで、複数の極を形成した永久磁石埋込式回転電機において、
前記２つの永久磁石を保持する２つの第１保持穴部と、前記２つの第１保持穴部同士の間に配置され、各第１保持穴部と各々連通する２つの第１空洞部と、隣接する一方の他極との間に配置され、前記一方側の第１保持穴部と連通する１つの第２空洞部と、隣接する他方の他極との間に配置され、前記他方側の第１保持穴部と連通すると共に外縁まで通じる１つの第１切欠部とを、前記一極分として複数組形成した第１積層鋼板と、
前記２つの第１保持穴部と同等の２つの第２保持穴部と、前記２つの第１空洞部と同等の２つの第３空洞部と、前記第２空洞部と重なるように配置され、前記一方側の第２保持穴部と連通すると共に外縁まで通じる１つの第２切欠部と、前記第１切欠部と重なるように配置され、前記他方側の第２保持穴部と連通する１つの第４空洞部とを、前記一極分として複数組形成した第２積層鋼板とを有し、
前記第１積層鋼板と前記第２積層鋼板とを、１枚ずつ又は数枚単位で交互に積層して、前記回転子の鉄心部分を構成したことを特徴とする永久磁石埋込式回転電機。 A permanent magnet embedded having a plurality of poles formed by embedding a plurality of sets of the two permanent magnets inside the rotor, with two permanent magnets arranged so as to spread outward or inward of the rotor as one pole. In a built-in rotating electrical machine,
Two first holding holes for holding the two permanent magnets, two first cavities disposed between the two first holding holes and communicating with the first holding holes, respectively. Arranged between one other adjacent pole and one second cavity communicating with the first holding hole on the one side and the other other adjacent pole, the other side A first laminated steel sheet in which a plurality of sets of one first cutout portion communicating with the first holding hole portion and leading to the outer edge are formed as the one pole,
Two second holding hole parts equivalent to the two first holding hole parts, two third cavity parts equivalent to the two first cavity parts, and the second cavity part, One second cutout portion communicating with the second holding hole portion on the one side and leading to the outer edge, and one second cutout portion arranged so as to overlap the first cutout portion and communicating with the second holding hole portion on the other side A second laminated steel sheet in which a plurality of fourth hollow portions are formed as a single pole, and
An embedded permanent magnet rotating electrical machine, wherein the first laminated steel plate and the second laminated steel plate are alternately laminated one by one or in several units to constitute an iron core portion of the rotor. 回転子の外側又は内側に向かって広がるように配置した２つの永久磁石を一極分として、前記２つの永久磁石を前記回転子の内部に複数組埋め込んで、複数の極を形成した永久磁石埋込式回転電機において、
前記２つの永久磁石を保持する２つの第１保持穴部と、前記２つの第１保持穴部同士を連通する１つの第１空洞部と、隣接する他極との間に配置され、各第１保持穴部と各々連通する２つの第２空洞部とを、前記一極分として複数組形成した第１積層鋼板と、
前記２つの第１保持穴部と同等の２つの第２保持穴部と、前記２つの第２保持穴部同士の間に配置され、各第２保持穴部と各々連通する２つの第３空洞部と、前記第２空洞部と重なるように配置され、各第２保持穴部と各々連通すると共に外縁まで通じる２つの切欠部とを、前記一極分として複数組形成した第２積層鋼板とを有し、
前記第１積層鋼板と前記第２積層鋼板とを、１枚ずつ又は数枚単位で交互に積層して、前記回転子の鉄心部分を構成したことを特徴とする永久磁石埋込式回転電機。 A permanent magnet embedded having a plurality of poles formed by embedding a plurality of sets of the two permanent magnets inside the rotor, with two permanent magnets arranged so as to spread outward or inward of the rotor as one pole. In a built-in rotating electrical machine,
Arranged between two first holding holes for holding the two permanent magnets, one first cavity communicating with the two first holding holes, and an adjacent other pole, A first laminated steel sheet in which a plurality of sets of two second cavities each communicating with one holding hole are formed as one pole; and
Two second holding holes equivalent to the two first holding holes, and two third cavities disposed between the two second holding holes and communicating with the second holding holes, respectively. And a second laminated steel sheet in which a plurality of sets of two notch portions that are arranged so as to overlap the second cavity portion and communicate with each second holding hole portion and to the outer edge are formed as one pole. Have
An embedded permanent magnet rotating electrical machine, wherein the first laminated steel plate and the second laminated steel plate are alternately laminated one by one or in several units to constitute an iron core portion of the rotor. 回転子の外側又は内側に向かって広がるように配置した２つの永久磁石を一極分として、前記２つの永久磁石を前記回転子の内部に複数組埋め込んで、複数の極を形成した永久磁石埋込式回転電機において、
前記２つの永久磁石を保持する２つの第１保持穴部と、前記２つの第１保持穴部同士を連通する１つの第１空洞部と、隣接する他極との間に配置され、各第１保持穴部と各々連通する２つの第２空洞部とを、前記一極分として複数組形成した第１積層鋼板と、
前記２つの第１保持穴部と同等の２つの第２保持穴部と、前記第２空洞部と重なるように配置され、各第２保持穴部と各々連通すると共に外縁まで通じる２つの切欠部とを、前記一極分として複数組形成した第２積層鋼板とを有し、
前記第１積層鋼板と前記第２積層鋼板とを、１枚ずつ又は数枚単位で交互に積層して、前記回転子の鉄心部分を構成したことを特徴とする永久磁石埋込式回転電機。 A permanent magnet embedded having a plurality of poles formed by embedding a plurality of sets of the two permanent magnets inside the rotor, with two permanent magnets arranged so as to spread outward or inward of the rotor as one pole. In a built-in rotating electrical machine,
Arranged between two first holding holes for holding the two permanent magnets, one first cavity communicating with the two first holding holes, and an adjacent other pole, A first laminated steel sheet in which a plurality of sets of two second cavities each communicating with one holding hole are formed as one pole; and
Two second holding hole portions that are equivalent to the two first holding hole portions, and two cutout portions that are arranged so as to overlap the second cavity portion and communicate with each second holding hole portion and to the outer edge. And a second laminated steel sheet formed as a plurality of sets as the one pole,
An embedded permanent magnet rotating electrical machine, wherein the first laminated steel plate and the second laminated steel plate are alternately laminated one by one or in several units to constitute an iron core portion of the rotor.
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