JP3970392B2 - Permanent magnet embedded rotor - Google Patents

Permanent magnet embedded rotor Download PDF

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Publication number
JP3970392B2
JP3970392B2 JP27839497A JP27839497A JP3970392B2 JP 3970392 B2 JP3970392 B2 JP 3970392B2 JP 27839497 A JP27839497 A JP 27839497A JP 27839497 A JP27839497 A JP 27839497A JP 3970392 B2 JP3970392 B2 JP 3970392B2
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JP
Japan
Prior art keywords
permanent magnet
rotor
insertion hole
rotor core
magnet insertion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP27839497A
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Japanese (ja)
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JPH11122852A (en
Inventor
典禎 西山
友一 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Panasonic Holdings Corp
Original Assignee
Panasonic Corp
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corp, Matsushita Electric Industrial Co Ltd filed Critical Panasonic Corp
Priority to JP27839497A priority Critical patent/JP3970392B2/en
Priority to EP05025811A priority patent/EP1641103B1/en
Priority to DE69833081T priority patent/DE69833081T2/en
Priority to EP98119237A priority patent/EP0909003B1/en
Priority to DE69839927T priority patent/DE69839927D1/en
Priority to US09/170,702 priority patent/US6353275B1/en
Publication of JPH11122852A publication Critical patent/JPH11122852A/en
Application granted granted Critical
Publication of JP3970392B2 publication Critical patent/JP3970392B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Description

【０００１】
【発明の属する技術分野】
本願発明は永久磁石埋め込み回転子に関するものである。
【０００２】
【従来の技術】
従来の永久磁石埋め込み回転子１は、図４に示すように、ロータコア本体２有する永久磁石挿入穴３に接着剤を塗布し、平板状の永久磁石４を挿入して組み立てた。そして、この永久磁石埋め込み回転子１を、ステータ５内に配置して電動機を構成した。このような電動機は、マグネットトルク及びリラクタンストルクを利用して回転駆動をしており、永久磁石４とロータコア本体２の外周との間に存在するロータコア外周部６を磁束通路とし、リラクタンストルクを利用して駆動していた。しかし、平板状の永久磁石４とロータコア本体２の外周との間隔が狭いと磁束通路が狭く、磁気飽和を起こしてしまい磁束量が少なくなり、リラクタンストルクが小さくなってしまう。そこで、永久磁石４をロータコア本体２のロータ軸内側に配置して、永久磁石４とロータコア本体２の外周の間隔、ロータコア外周部６を広く取り、磁束通路を大きくして、更に大きくリラクタンストルクを利用することを考えた。
【０００３】
【発明が解決しようとする課題】
しかしながら、永久磁石４とロータコア本体２の間隔を広く取り、磁束通路を大きくして磁束量が多く通過するようにしたが、永久磁石端部もロータコア本体２の外周から離れてしまうため、隣接する永久磁石４の間で、磁気の回り込みが生じてしまい有効な磁束が減少してしまう。
【０００４】
本願発明は、磁束通路を広く取り且つ磁気の回り込みが生じない永久磁石埋め込み回転子を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本願発明の永久磁石埋め込み回転子は、永久磁石挿入穴を備えたロータコア本体と、前記永久磁石挿入穴に挿入する断面が略台形形状の永久磁石と、前記永久磁石挿入穴の片側にロータ外周側面へ向けた低透磁率部を有した永久磁石埋め込み回転子であり、ロータ外周部を広くしたに関わらず、低透磁率部により隣接する永久磁石に生じる磁気回り込みを抑え効率よく電動機を駆動することができる。
【０００６】
【発明の実施の形態】
本願発明は、永久磁石挿入穴を備えたロータコア本体と、前記永久磁石挿入穴に挿入する断面が略台形形状の永久磁石と、前記永久磁石挿入穴の同一方向の片側にロータ外周側端面に設けた低透磁率部とからなる永久磁石埋め込み回転子であり、低透磁率部により隣接する永久磁石に生じる磁気回り込みを抑えることができる。また、ロータ外周側に低透磁率部を突出させるとよい。凹部はロータ軸方向に連続して伸びるとよい。
【０００７】
また、低透磁率部はロータコア本体に設けた凹部であり、低透磁率部とロータコア本体外周との間にロータコア本体の一部が存在しているので、ロータコア外周部は１体にロータコア本体に連結されている。
【０００８】
また、凹部に接着剤を充填することにより、凹部は接着層で満たされロータコア本体の強度が高くなる。
【０００９】
【実施例】
本願発明の永久磁石埋め込み回転子を以下に説明する。
【００１０】
図１の参考例に示すように、永久磁石埋め込み回転子１０は、磁性薄板を積層したロータコア本体１１が有する断面が略台形形状の永久磁石挿入穴１３の壁面に接着剤を塗布し、平板状の永久磁石１２を挿入して組み立てる。この時、永久磁石挿入穴１３の壁面には低透磁率部となる凹部１４を設ける。ロータコア外周側端部に設けた凹部１４は、ロータ軸方向に連続した溝となし、ロータコア外周側に突出するように設けている。そのためロータコア外周と永久磁石挿入穴１３との間隔は、凹部１４の部分が最も短くなり、凹部１４が磁束遮断壁として、永久磁石端部での磁束の通過を阻止する。
【００１１】
このように、永久磁石挿入穴１３のロータ外周側端部に凹部１４を設けることにより、ロータ磁石挿入穴１３とロータ外周側の間隔であるロータコア外周部１６を広く取り、ステータからの磁束を多量に通過するようにしても、永久磁石挿入穴１３の端部には凹部１５が備えるため、隣接する永久磁石間で磁束の回り込みが生じることがない永久磁石埋め込み回転子１０を提供することができる。このような回転子をステータの中に配置して、組み立てたリラクタンストルク及びマグネットトルクを利用して回転駆動する永久磁石埋め込みモータはリラクタンストルクを効率よく利用することができる。
【００１２】
なお、凹部１４は空隙状態にしておいてもよいが、凹部１４に接着剤を充填して永久磁石埋め込み回転子１０の強度を高くする。このように凹部１４を設け、接着剤を充填する
ことにより、永久磁石１４と永久磁石挿入穴１３の大きさをほぼ同じにしても、永久磁石１２とロータコア本体１１は接着層により固着することができる。つまり、永久磁石挿入穴１３の壁面に塗布した接着剤が永久磁石１２を挿入することにより押し出され、且つ削ぎ落とされる可能性があるが、凹部１４に接着剤を充填することにより少なくとも、凹部１４での接着層は残るので、ロータコア本体１２と永久磁石１４とを接着剤により固定することができる。
【００１３】
また、低透磁率部はロータ外周まで貫通してもよいが、本願のような凹部であれば各ロータ外周部１６はロータコア本体１１と１体になっており、ロータコアに強度を高く維持することができる。
【００１４】
また、凹部１４をロータ軸１８側に設けてロータコア本体１１と永久磁石１２を確実に接着剤により固定してもよい。
【００１５】
また、凹部１４はロータ外周側には永久磁石挿入穴の端部のみに設けることが優れている。凹部１４を永久磁石外周側の中央部に設けると、凹部１４により磁束通路が妨げられてしまうので、好ましくはロータ外周側の凹部１４は永久磁石挿入穴の端部のみに設けることがよい。また、マグネットトルクを利用して回転駆動を行う場合、永久磁石挿入穴１３は可能な限り接しているほうがよく、永久磁石１２とロータコア外周部１６の間に接着層が存在すると、ロータ外周側へ発生する磁束量は小さくなる。つまり、永久磁石挿入穴１３とロータコア外周部１６の間には接着層を介してはいない、又は少なくとも１箇所では永久磁石とロータコア外周部は接していることが好ましい。
【００１６】
なお、図面には１層式の永久磁石埋め込み回転子しか示していないが、２層埋め込み式であってもよい。
【００１７】
また、参考例に加えて図２，図３に示すように、本発明では、凹部１４は隣接する永久磁石１２の間に少なくとも１つ配置するように凹部１４は片側、又は永久磁石挿入穴１３のひとつおきに凹部１４を両端部に設けている。また、上記実施例では８極の電動機が示してあるが、他の極数の電動機であっても同様の効果を奏する。
【００１８】
【発明の効果】
本願請求項1，２，４記載の発明は、ロータコア外周部を大きく取り磁束通路を大きくすることができ、且つ隣接する永久磁石の磁気回り込みを抑えることができるので効率良いリラクタントルクが得られる。
【００１９】
請求項３記載の発明は、永久磁石埋め込み回転子の強度が高く、高速回転を可能にする。
【００２０】
請求項５記載の発明は、永久磁石埋め込み回転子の強度が高く、更に高速回転を可能にする。
【図面の簡単な説明】
【図１】 参考例のロータコア断面図
【図２】 本願の実施例のロータコア断面図
【図３】 本願他の実施例のロータコア断面図
【図４】 従来のロータコアの断面図
【符号の説明】
１１ ロータコア本体
１２ 永久磁石
１３ 永久磁石挿入穴
１４ 凹部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a permanent magnet embedded rotor.
[0002]
[Prior art]
As shown in FIG. 4, the conventional permanent magnet embedded rotor 1 was assembled by applying an adhesive to the permanent magnet insertion hole 3 of the rotor core body 2 and inserting the flat permanent magnet 4. And this permanent magnet embedded rotor 1 was arrange | positioned in the stator 5, and the electric motor was comprised. Such an electric motor is driven to rotate using magnet torque and reluctance torque. The rotor core outer peripheral portion 6 existing between the permanent magnet 4 and the outer periphery of the rotor core main body 2 is used as a magnetic flux path, and reluctance torque is used. And was driving. However, if the distance between the flat permanent magnet 4 and the outer periphery of the rotor core main body 2 is narrow, the magnetic flux path is narrow, causing magnetic saturation, reducing the amount of magnetic flux, and reducing the reluctance torque. Therefore, the permanent magnet 4 is arranged on the rotor shaft inner side of the rotor core main body 2, the distance between the outer periphery of the permanent magnet 4 and the rotor core main body 2, the rotor core outer peripheral portion 6 is widened, the magnetic flux passage is enlarged, and the reluctance torque is further increased. I thought about using it.
[0003]
[Problems to be solved by the invention]
However, the gap between the permanent magnet 4 and the rotor core main body 2 is widened and the magnetic flux passage is enlarged to allow a large amount of magnetic flux to pass through. However, the end of the permanent magnet is also separated from the outer periphery of the rotor core main body 2 and is therefore adjacent. Magnetic wraparound occurs between the permanent magnets 4 and the effective magnetic flux decreases.
[0004]
It is an object of the present invention to provide a permanent magnet embedded rotor that has a wide magnetic flux path and does not cause magnetic wraparound.
[0005]
[Means for Solving the Problems]
The embedded permanent magnet rotor of the present invention includes a rotor core body having a permanent magnet insertion hole, a permanent magnet having a substantially trapezoidal cross section to be inserted into the permanent magnet insertion hole, and a rotor outer peripheral side surface on one side of the permanent magnet insertion hole. A permanent magnet embedded rotor having a low magnetic permeability portion toward the rotor, and efficiently drives the electric motor while suppressing the magnetic wraparound that occurs in the adjacent permanent magnet by the low magnetic permeability portion regardless of the wide rotor outer peripheral portion. Can do.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a rotor core body having a permanent magnet insertion hole, a permanent magnet having a substantially trapezoidal cross section to be inserted into the permanent magnet insertion hole, and a rotor outer peripheral end face on one side of the permanent magnet insertion hole in the same direction. In addition, the permanent magnet embedded rotor including the low magnetic permeability portion can suppress the magnetic wraparound generated in the adjacent permanent magnet by the low magnetic permeability portion. Moreover, it is good to make a low-permeability part protrude in the rotor outer peripheral side. The recess may extend continuously in the rotor axial direction.
[0007]
Further, the low magnetic permeability portion is a recess provided in the rotor core main body, and a part of the rotor core main body exists between the low magnetic permeability portion and the outer periphery of the rotor core main body. It is connected.
[0008]
Further, by filling the concave portion with the adhesive, the concave portion is filled with the adhesive layer, and the strength of the rotor core body is increased.
[0009]
【Example】
The permanent magnet embedded rotor of the present invention will be described below.
[0010]
As shown in the reference example of FIG. 1, the embedded permanent magnet rotor 10 is formed by applying an adhesive to the wall surface of the permanent magnet insertion hole 13 having a substantially trapezoidal cross section in the rotor core body 11 in which magnetic thin plates are laminated. The permanent magnet 12 is inserted and assembled. At this time, the wall surface of the permanent magnet insertion hole 13 is provided with a concave portion 14 serving as a low magnetic permeability portion. The concave portion 14 provided at the end portion on the outer periphery side of the rotor core is formed as a groove continuous in the rotor axial direction, and is provided so as to protrude to the outer peripheral side of the rotor core . Therefore, the space | interval of a rotor core outer periphery and the permanent magnet insertion hole 13 has the shortest part of the recessed part 14, and the recessed part 14 serves as a magnetic flux interruption | blocking wall, and prevents passage of the magnetic flux in a permanent magnet edge part.
[0011]
Thus, by providing the recess 14 at the rotor outer peripheral side end of the permanent magnet insertion hole 13, the rotor core outer peripheral part 16, which is the distance between the rotor magnet insertion hole 13 and the rotor outer peripheral side, is widened, and a large amount of magnetic flux from the stator is generated. Even if the permanent magnet insertion hole 13 passes through, the concave portion 15 is provided at the end of the permanent magnet insertion hole 13, so that it is possible to provide the permanent magnet embedded rotor 10 in which no wraparound of magnetic flux occurs between adjacent permanent magnets. . A permanent magnet embedded motor in which such a rotor is arranged in the stator and is driven to rotate using the assembled reluctance torque and magnet torque can efficiently use the reluctance torque.
[0012]
The recess 14 may be left in a void state, but the recess 14 is filled with an adhesive to increase the strength of the permanent magnet embedded rotor 10. Thus, by providing the concave portion 14 and filling the adhesive, the permanent magnet 12 and the rotor core body 11 can be fixed by the adhesive layer even if the sizes of the permanent magnet 14 and the permanent magnet insertion hole 13 are substantially the same. it can. In other words, the adhesive applied to the wall surface of the permanent magnet insertion hole 13 may be pushed out and scraped off by inserting the permanent magnet 12, but at least the recess 14 is filled by filling the recess 14 with the adhesive. Thus, the rotor core body 12 and the permanent magnet 14 can be fixed with an adhesive.
[0013]
In addition, the low magnetic permeability portion may penetrate to the outer periphery of the rotor, but if it is a recess as in the present application, each rotor outer peripheral portion 16 is a single body with the rotor core main body 11, and the rotor core is maintained with high strength. Can do.
[0014]
Alternatively, the concave portion 14 may be provided on the rotor shaft 18 side to securely fix the rotor core body 11 and the permanent magnet 12 with an adhesive.
[0015]
Moreover, it is excellent to provide the recessed part 14 only in the edge part of a permanent magnet insertion hole in the rotor outer peripheral side. If the concave portion 14 is provided in the central portion on the outer peripheral side of the permanent magnet, the magnetic flux path is obstructed by the concave portion 14, and therefore the concave portion 14 on the outer peripheral side of the rotor is preferably provided only at the end portion of the permanent magnet insertion hole. Further, in the case of rotational driving using magnet torque, it is better that the permanent magnet insertion hole 13 is in contact as much as possible. The amount of magnetic flux generated is reduced. That is, it is preferable that an adhesive layer is not interposed between the permanent magnet insertion hole 13 and the rotor core outer peripheral portion 16, or the permanent magnet and the rotor core outer peripheral portion are in contact with each other at least at one place.
[0016]
Although only a single-layer permanent magnet embedded rotor is shown in the drawing, a double-layer embedded type may be used.
[0017]
As shown in FIGS. 2 and 3 in addition to the reference example, in the present invention, the concave portion 14 is arranged on one side or the permanent magnet insertion hole 13 so that at least one concave portion 14 is disposed between the adjacent permanent magnets 12. A recess 14 is provided at each end of every other. Moreover, although the eight-pole motor is shown in the above embodiment, the same effect can be obtained even with other pole motors.
[0018]
【The invention's effect】
In the inventions according to claims 1, 2, and 4 of the present application, the outer circumference of the rotor core can be made larger to increase the magnetic flux passage, and the magnetic wraparound of the adjacent permanent magnet can be suppressed, so that an efficient reluctan torque can be obtained. .
[0019]
According to the third aspect of the present invention, the permanent magnet embedded rotor has a high strength and enables high-speed rotation.
[0020]
According to the fifth aspect of the present invention, the permanent magnet embedded rotor has a high strength and can be rotated at a high speed.
[Brief description of the drawings]
1 is a cross-sectional view of a rotor core of a reference example . FIG. 2 is a cross-sectional view of a rotor core of an embodiment of the present application. FIG. 3 is a cross-sectional view of a rotor core of another embodiment of the present application.
11 Rotor core body 12 Permanent magnet 13 Permanent magnet insertion hole 14 Recess

Claims (3)

永久磁石挿入穴を備えたロータコア本体と、永久磁石挿入穴に挿入する断面が略台形形状の永久磁石と、永久磁石挿入穴の同一方向の片側にロータ外周側面へ向けた低透磁率部を有した永久磁石埋め込み回転子。A rotor core body with a permanent magnet insertion hole, a permanent magnet with a substantially trapezoidal cross section to be inserted into the permanent magnet insertion hole, and a low permeability portion facing the rotor outer circumferential surface on one side of the permanent magnet insertion hole in the same direction. permanent magnet embedded rotor was. 永久磁石挿入穴を備えたロータコア本体と、永久磁石挿入穴に挿入する断面が略台形形状の永久磁石と、永久磁石挿入穴の端でロータ外周側面に向けた低透磁率部を有しているものと、低透磁率部のない永久磁石挿入穴とを交互に配置した永久磁石埋め込み回転子。  A rotor core body having a permanent magnet insertion hole, a permanent magnet having a substantially trapezoidal cross section to be inserted into the permanent magnet insertion hole, and a low magnetic permeability portion directed toward the rotor outer peripheral surface at the end of the permanent magnet insertion hole. A permanent magnet embedded rotor in which a permanent magnet insertion hole without a low magnetic permeability portion is alternately arranged. 低透磁率部はロータコア本体に設けた凹部であり、前記凹部に接着剤を充填した請求項１または２記載の永久磁石埋め込み回転子。The permanent magnet embedded rotor according to claim 1, wherein the low magnetic permeability portion is a recess provided in the rotor core body, and the recess is filled with an adhesive.
JP27839497A 1997-10-13 1997-10-13 Permanent magnet embedded rotor Expired - Fee Related JP3970392B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP27839497A JP3970392B2 (en) 1997-10-13 1997-10-13 Permanent magnet embedded rotor
EP05025811A EP1641103B1 (en) 1997-10-13 1998-10-12 A motor using a rotor including interior permanent magnets
DE69833081T DE69833081T2 (en) 1997-10-13 1998-10-12 Motor with inner permanent magnet rotor
EP98119237A EP0909003B1 (en) 1997-10-13 1998-10-12 A motor using a rotor including interior permanent magnets
DE69839927T DE69839927D1 (en) 1997-10-13 1998-10-12 Motor with inner permanent magnet rotor
US09/170,702 US6353275B1 (en) 1997-10-13 1998-10-13 Rotor with adhesive filled grooves fastening interior permanent magnets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27839497A JP3970392B2 (en) 1997-10-13 1997-10-13 Permanent magnet embedded rotor

Publications (2)

Publication Number Publication Date
JPH11122852A JPH11122852A (en) 1999-04-30
JP3970392B2 true JP3970392B2 (en) 2007-09-05

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US9853509B2 (en) 2012-05-28 2017-12-26 Aida Engineering, Ltd. Composite torque rotating electric machine

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WO2015198444A1 (en) * 2014-06-26 2015-12-30 三菱電機株式会社 Interior permanent magnet electric motor, compressor, and refrigerating and air-conditioning device

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US9806571B2 (en) 2012-05-28 2017-10-31 Aida Engineering, Ltd. Composite torque rotating electric machine
US9853509B2 (en) 2012-05-28 2017-12-26 Aida Engineering, Ltd. Composite torque rotating electric machine

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