JP2004328970A - Permanent magnet synchronous motor - Google Patents

Permanent magnet synchronous motor Download PDF

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Publication number
JP2004328970A
JP2004328970A JP2003124095A JP2003124095A JP2004328970A JP 2004328970 A JP2004328970 A JP 2004328970A JP 2003124095 A JP2003124095 A JP 2003124095A JP 2003124095 A JP2003124095 A JP 2003124095A JP 2004328970 A JP2004328970 A JP 2004328970A
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JP
Japan
Prior art keywords
permanent magnet
rotor
resin
rotor core
holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003124095A
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Japanese (ja)
Inventor
Takayuki Kai
隆之 甲斐
Matsuo Kawamoto
松雄 河本
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 Holdings Corp
Original Assignee
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP2003124095A priority Critical patent/JP2004328970A/en
Publication of JP2004328970A publication Critical patent/JP2004328970A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent magnet synchronous motor that does not cause the number of components and assembling processes to be increased and that does not degrade performance as an electric motor. <P>SOLUTION: A plurality of permanent magnet embedding holes are provided in a rotor iron core 2. The permanent magnets 3 are embedded, and an output transmitting boss 1, the rotor iron core 2, and the permanent magnets 3 are molded integrally with a resin 4 having electric insulation property. A plurality of through-holes 21 are provided in the axial direction of the rotor iron core 2 and the resin 4 is filled into the through-holes 21 to form resin portions at both ends of the rotor iron core 2. Also, a part or the entire portions of both end surfaces of the permanent magnet 3 embedded in the rotor iron core 2 are covered by the resin 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、各種家電製品の駆動源として使用される永久磁石式同期電動機に関する。
【0002】
【従来の技術】
図3、4は従来の永久磁石式同期電動機の回転子の1例である。1は出力伝達ボス、2は回転子鉄心、3は永久磁石、4は端板、5はリベットである。
【0003】
従来の構成においては、回転子鉄心に複数個の永久磁石埋め込み用孔を設けて、永久磁石を埋め込み配置しても、永久磁石の回転子軸方向の位置規制のために、永久磁石の埋め込み穴の無い端板を回転子鉄心の両端面部に配置し、複数のリベットにより、かしめ固定する方法をとらざるを得ない。
【0004】
また、図5,6も従来の永久磁石式同期電動機の回転子の1例である。1は出力伝達ボス、3は永久磁石、4は絶縁性樹脂、6は回転子ヨークである。
【0005】
本図の従来の構成においては、出力伝達ボス、回転子ヨーク、永久磁石を絶縁性を有する樹脂により一体成形をするが、永久磁石の回転子軸方向並びに回転子ラジアル方向の位置規制のために、永久磁石を樹脂にて完全に覆わざるを得ない(例えば、特許文献1参照)。
【0006】
【特許文献1】
特開2000−078787号公報
【0007】
【発明が解決しようとする課題】
以上のような従来の永久磁石式同期電動機の回転子においては、図3の例では、永久磁石の軸方向の位置規制のために、回転子鉄心の両端面部に端板を配置し、さらに複数のリベットにより、かしめ固定を行わなければならず、部品点数が増え、さらに組立工数が増加する要因になっていた。
【0008】
図5の例では、永久磁石の回転子軸方向並びに回転子ラジアル方向の位置規制のために、永久磁石を樹脂にて完全に覆わなくてはならず、とりわけ永久磁石の外形側(すなわち回転子の固定子と対向する面)に非磁性の樹脂が存在するため、回転子と対向して配置される固定子との磁気ギャップが大きくなり、電動機としての特性悪化の要因となっていた。
【0009】
本発明は、上記の課題を解決するものであり、部品点数と組立工数を増加させることなく、また、電動機としての性能悪化をさせることのない永久磁石式同期電動機を提供することを目的とする。
【0010】
【課題を解決するための手段】
上記目的を達成するために、本発明の永久磁石式同期電動機は、回転子鉄心に複数個の永久磁石埋め込み用孔を設けて、永久磁石を埋め込み、かつ、絶縁性を有する樹脂にて出力伝達ボスと回転子鉄心と永久磁石を一体成形し、回転子鉄心の軸方向に複数個の貫通孔を設け、貫通孔に樹脂を流し、回転子鉄心の両端部に樹脂部分が成形され、かつ、回転子鉄心に埋め込まれた永久磁石の両端面の一部もしくは全部が、樹脂により覆い隠される回転子構成を有している。
【0011】
【発明の実施の形態】
本願の請求項1に記載の発明は、出力伝達ボスと、回転子鉄心と、永久磁石からなり、前記回転子鉄心に複数個の永久磁石埋め込み用孔を設けて、前記永久磁石を埋め込み、かつ、絶縁性を有する樹脂にて前記出力伝達ボスと前記回転子鉄心と前記永久磁石を一体成形してなる永久磁石式同期電動機の回転子と、固定子からなる永久磁石式同期電動機において、前記回転子鉄心の軸方向に複数個の貫通孔を設け、前記貫通孔に前記樹脂が流れ、前記回転子鉄心の両端部に樹脂部分が成形された回転子であることを特徴とする永久磁石式同期電動機であり、回転子の固定子と対向する面に非磁性の樹脂が存在することなく、磁気ギャップを小さくできるため、電動機としての性能悪化を防ぐことができる。
【0012】
本願の請求項2に記載の発明は、絶縁性を有する樹脂により一体成形された後に、回転子鉄心に埋め込まれた永久磁石の両端面の一部もしくは全部が、前記樹脂により覆い隠される請求項1記載の永久磁石式同期電動機の回転子の構成のため、永久磁石の位置規制を部品点数や組立工数の増加を防ぐことが可能である。
【0013】
本願の請求項3に記載の発明は、回転子鉄心の軸方向に複数個設けた貫通孔が、隣接する回転子鉄心に複数個の永久磁石埋め込み用孔の間に設けられていることを特徴とする請求項2に記載の永久磁石式同期電動機であり、特に、永久磁石の両端面の一部を覆い隠すようにした場合、樹脂の使用量を軽減することができる。
【0014】
【実施例】
以下、本発明の実施例について、図1、2を用いて説明する。
【0015】
図1、2は、永久磁石を回転子鉄心に埋め込み配置した同期電動機の回転子である。図において、1は出力伝達ボス、2は回転子鉄心、3は永久磁石、4は樹脂である。回転子鉄心2に複数個の永久磁石埋め込み用孔を設けて、永久磁石3を埋め込み、かつ、絶縁性を有する樹脂4にて出力伝達ボス1と回転子鉄心2と永久磁石3を一体的に成形される。この成形時に、回転子鉄心2の軸方向であって、隣接する永久磁石埋め込み用孔間に設けた複数個の貫通孔21にも、樹脂4が流し込まれるため、回転子鉄心2の両端面22、23にも樹脂成形部41、42を有することができる。なお、隣接する永久磁石埋め込み用孔間とは、隣接する永久磁石埋め込み用孔の間に存在する回転子鉄心部分24のみに限定するものではなく、回転子鉄心部分24と径方向の同一線上をも含むものであり、例えば、図1に示す貫通孔21が設けられている部分も、これに該当する。このような構成は次に説明する樹脂形成部41、42を永久磁石3の両端面31、32の一部を覆い隠すようにする場合、好適である。
【0016】
さらに、この樹脂成形部41、42が、永久磁石3の両端面31、32の一部もしくは全部を覆い隠すように配置することにより、位置規制用部品の追加をしなくとも、永久磁石3の回転子軸方向の位置規制をすることができる。なお、樹脂形成部41、42の少なくともいずれか一方を、永久磁石3の両端面31、32の一部を覆い隠すようにした場合、樹脂形成部41は隣接する永久磁石3の両端部に掛る程度の大きさであれば足りる。これにより、樹脂の使用量を軽減することができ、回転子の軽量化が必要な場合、有効である。
【0017】
また、各種家電製品の電動機の取付寸法との関係上、本実施例のような、カップ形状の回転子の形態を取らざるを得ない場合には、回転子の内径側に樹脂を流すための肉厚を確保することが寸法上困難であり、また回転子の外径側に樹脂を流すための肉厚を確保すると、磁気ギャップが大きくなり、電動機としての性能劣化を招くことになるので、本発明の構成が特に有用となる。
【0018】
なお、本発明は、上記実施例に限定されるものではなく、回転子の極数や形状、永久磁石の形状や数、配置等、本発明の趣旨に応じて変更が可能である。
【0019】
【発明の効果】
本発明は、回転子鉄心に複数個の樹脂を流すための貫通孔を設けたため、部品点数と組立工数を増加させることなく、また、電動機としての性能悪化をさせることのない永久磁石式同期電動機の回転子を提供することができる。
【図面の簡単な説明】
【図1】本発明の実施例の回転子の正面図
【図2】本発明の実施例の回転子の断面図(図1のA−O−B断面図)
【図3】従来の実施例の回転子の正面図
【図4】従来の実施例の回転子の断面図(図3のA−O−B断面図)
【図5】従来の実施例の回転子の正面図
【図6】従来の実施例の回転子の断面図(図5のA−O−B断面図)
【符号の説明】
1 出力伝達ボス
2 回転子鉄心
21 貫通孔
22 回転子鉄心の端面
23 回転子鉄心の端面
3 永久磁石
31 永久磁石の端面
32 永久磁石の端面
4 樹脂
41 樹脂成形部
42 樹脂成形部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a permanent magnet type synchronous motor used as a drive source for various home appliances.
[0002]
[Prior art]
3 and 4 show an example of a rotor of a conventional permanent magnet type synchronous motor. 1 is an output transmission boss, 2 is a rotor core, 3 is a permanent magnet, 4 is an end plate, and 5 is a rivet.
[0003]
In the conventional configuration, even if a plurality of holes for embedding permanent magnets are provided in the rotor core, and the permanent magnets are embedded and arranged, the holes for embedding the permanent magnets are required to restrict the position of the permanent magnets in the rotor axial direction. There is no other way than to arrange the end plates without the ends on both end faces of the rotor core and fix them with a plurality of rivets.
[0004]
FIGS. 5 and 6 are also examples of a rotor of a conventional permanent magnet type synchronous motor. 1 is an output transmission boss, 3 is a permanent magnet, 4 is an insulating resin, and 6 is a rotor yoke.
[0005]
In the conventional configuration shown in the figure, the output transmission boss, the rotor yoke, and the permanent magnet are integrally molded with an insulating resin. However, in order to regulate the position of the permanent magnet in the rotor axial direction and the rotor radial direction. However, the permanent magnet must be completely covered with the resin (for example, see Patent Document 1).
[0006]
[Patent Document 1]
JP 2000-078787 A
[Problems to be solved by the invention]
In the rotor of the conventional permanent magnet type synchronous motor as described above, in the example of FIG. 3, end plates are arranged on both end faces of the rotor core to regulate the position of the permanent magnet in the axial direction. Due to the rivet, it is necessary to perform caulking and fixing, which increases the number of parts and further increases the number of assembly steps.
[0008]
In the example of FIG. 5, in order to regulate the position of the permanent magnet in the rotor axial direction and the rotor radial direction, the permanent magnet must be completely covered with resin, and especially the outer side of the permanent magnet (that is, the rotor). The non-magnetic resin is present on the surface facing the stator), so that the magnetic gap between the rotor and the stator arranged facing the rotor becomes large, which causes deterioration of the characteristics of the electric motor.
[0009]
An object of the present invention is to solve the above-mentioned problems and to provide a permanent magnet synchronous motor that does not increase the number of parts and the number of assembling steps and does not deteriorate the performance of the motor. .
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a permanent magnet type synchronous motor of the present invention has a plurality of permanent magnet embedding holes in a rotor core, in which permanent magnets are embedded, and output power is transmitted by a resin having an insulating property. The boss, the rotor core and the permanent magnet are integrally formed, a plurality of through holes are provided in the axial direction of the rotor core, resin is flowed through the through holes, and resin portions are formed at both ends of the rotor core, and Part or all of both end faces of the permanent magnet embedded in the rotor core has a rotor configuration that is covered by resin.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 of the present application includes an output transmission boss, a rotor core, and a permanent magnet, wherein a plurality of permanent magnet embedding holes are provided in the rotor core to embed the permanent magnet, and A rotor of a permanent magnet type synchronous motor in which the output transmission boss, the rotor core, and the permanent magnet are integrally formed of resin having an insulating property, and a permanent magnet type synchronous motor including a stator, wherein the rotation A permanent magnet type synchronous rotor, wherein a plurality of through holes are provided in the axial direction of the core, the resin flows through the through holes, and a resin part is formed at both ends of the rotor core. Since the motor is a motor, the magnetic gap can be reduced without the presence of non-magnetic resin on the surface of the rotor facing the stator, so that the performance of the motor can be prevented from deteriorating.
[0012]
The invention according to claim 2 of the present application is that, after being integrally molded with an insulating resin, a part or all of both end faces of the permanent magnet embedded in the rotor core is covered by the resin. Due to the configuration of the rotor of the permanent magnet type synchronous motor described in 1, the position of the permanent magnet can be restricted to prevent an increase in the number of parts and the number of assembly steps.
[0013]
The invention described in claim 3 of the present application is characterized in that a plurality of through holes provided in the axial direction of the rotor core are provided between the plurality of permanent magnet embedding holes in the adjacent rotor core. In particular, when a part of both end faces of the permanent magnet is covered, the amount of resin used can be reduced.
[0014]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0015]
1 and 2 show a rotor of a synchronous motor in which a permanent magnet is embedded in a rotor core. In the figure, 1 is an output transmission boss, 2 is a rotor core, 3 is a permanent magnet, and 4 is a resin. A plurality of holes for embedding permanent magnets are provided in the rotor core 2 to embed the permanent magnets 3, and the output transmission boss 1, the rotor core 2, and the permanent magnets 3 are integrally formed by a resin 4 having an insulating property. Molded. During this molding, the resin 4 is poured into a plurality of through holes 21 provided between the adjacent permanent magnet embedding holes in the axial direction of the rotor core 2. , 23 can also have resin molded portions 41, 42. Note that the term “between adjacent permanent magnet embedding holes” is not limited to only the rotor core portion 24 existing between adjacent permanent magnet embedding holes. For example, a portion provided with the through hole 21 shown in FIG. 1 also corresponds to this. Such a configuration is suitable when the resin forming portions 41 and 42 described below cover a part of both end surfaces 31 and 32 of the permanent magnet 3.
[0016]
Furthermore, by arranging the resin molded portions 41 and 42 so as to cover part or all of both end surfaces 31 and 32 of the permanent magnet 3, the position of the permanent magnet 3 can be reduced without adding a position regulating component. The position in the rotor axis direction can be regulated. When at least one of the resin forming portions 41 and 42 covers part of both end surfaces 31 and 32 of the permanent magnet 3, the resin forming portion 41 hangs on both end portions of the adjacent permanent magnet 3. It is enough if it is about the size. As a result, the amount of resin used can be reduced, which is effective when the weight of the rotor needs to be reduced.
[0017]
In addition, when it is inevitable to take the form of a cup-shaped rotor as in the present embodiment due to the mounting dimensions of the electric motors of various home appliances, a resin for flowing resin to the inner diameter side of the rotor is required. It is difficult to secure the wall thickness in terms of dimensions, and if the wall thickness for flowing the resin to the outer diameter side of the rotor is secured, the magnetic gap becomes large and the performance as an electric motor is deteriorated. The configuration of the present invention is particularly useful.
[0018]
Note that the present invention is not limited to the above-described embodiment, and can be changed according to the gist of the present invention, such as the number of poles and the shape of the rotor, and the shape, number, and arrangement of the permanent magnets.
[0019]
【The invention's effect】
The present invention provides a permanent magnet type synchronous motor that does not increase the number of parts and the number of assembling steps, and does not deteriorate the performance as an electric motor because a plurality of through holes for flowing a plurality of resins are provided in the rotor core. Rotor can be provided.
[Brief description of the drawings]
FIG. 1 is a front view of a rotor according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of the rotor according to the embodiment of the present invention (cross-sectional view taken along line AOB in FIG. 1);
FIG. 3 is a front view of a rotor of a conventional embodiment. FIG. 4 is a cross-sectional view of a rotor of a conventional embodiment (cross-sectional view taken along line AOB of FIG. 3).
FIG. 5 is a front view of a rotor according to a conventional embodiment. FIG. 6 is a cross-sectional view of a rotor according to a conventional embodiment (cross-sectional view taken along line AOB in FIG. 5).
[Explanation of symbols]
REFERENCE SIGNS LIST 1 output transmission boss 2 rotor core 21 through hole 22 end face of rotor core 23 end face of rotor core 3 permanent magnet 31 end face of permanent magnet 32 end face of permanent magnet 4 resin 41 resin molding part 42 resin molding part

Claims (3)

出力伝達ボスと、回転子鉄心と、永久磁石からなり、前記回転子鉄心に複数個の永久磁石埋め込み用孔を設けて、前記永久磁石を埋め込み、かつ、絶縁性を有する樹脂にて前記出力伝達ボスと前記回転子鉄心と前記永久磁石を一体成形してなる永久磁石式同期電動機の回転子と、固定子からなる永久磁石式同期電動機において、前記回転子鉄心の軸方向に複数個の貫通孔を設け、前記貫通孔に前記樹脂が流れ、前記回転子鉄心の両端部に樹脂部分が成形された回転子であることを特徴とする永久磁石式同期電動機。An output transmission boss, a rotor core, and a permanent magnet are provided. A plurality of permanent magnet embedding holes are provided in the rotor core to embed the permanent magnet, and the output transmission is made of an insulating resin. In a permanent magnet synchronous motor including a boss, a rotor core, and a permanent magnet integrally formed with a permanent magnet, and a permanent magnet synchronous motor including a stator, a plurality of through holes are provided in an axial direction of the rotor core. Wherein the resin flows through the through-hole, and the rotor is a rotor in which resin portions are formed at both ends of the rotor core. 絶縁性を有する樹脂により一体成形された後に、回転子鉄心に埋め込まれた永久磁石の両端面の一部もしくは全部が、前記樹脂により覆い隠されたことを特徴とする請求項1記載の永久磁石式同期電動機。2. The permanent magnet according to claim 1, wherein a part or all of both end surfaces of the permanent magnet embedded in the rotor core are covered and hidden by the resin after being integrally molded with an insulating resin. Type synchronous motor. 回転子鉄心の軸方向に複数個設けた貫通孔が、隣接する回転子鉄心に複数個の永久磁石埋め込み用孔の間に設けられていることを特徴とする請求項2に記載の永久磁石式同期電動機。The permanent magnet type according to claim 2, wherein a plurality of through holes provided in an axial direction of the rotor core are provided between the plurality of permanent magnet embedding holes in adjacent rotor cores. Synchronous motor.
JP2003124095A 2003-04-28 2003-04-28 Permanent magnet synchronous motor Pending JP2004328970A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012244649A (en) * 2011-05-16 2012-12-10 Daikin Ind Ltd Rotor and rotary electric machine
DE102014116897A1 (en) 2013-11-26 2015-05-28 Fanuc Corporation Rotor with holes for filling with resin and method for producing a rotor
WO2016063371A1 (en) * 2014-10-22 2016-04-28 三菱電機株式会社 Rotor of rotating electrical machine, rotating electrical machine, and air conditioning device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012244649A (en) * 2011-05-16 2012-12-10 Daikin Ind Ltd Rotor and rotary electric machine
DE102014116897A1 (en) 2013-11-26 2015-05-28 Fanuc Corporation Rotor with holes for filling with resin and method for producing a rotor
JP2015104244A (en) * 2013-11-26 2015-06-04 ファナック株式会社 Rotor having resin hole for resin filling and manufacturing method of rotor
WO2016063371A1 (en) * 2014-10-22 2016-04-28 三菱電機株式会社 Rotor of rotating electrical machine, rotating electrical machine, and air conditioning device
JPWO2016063371A1 (en) * 2014-10-22 2017-04-27 三菱電機株式会社 Rotating electric machine rotor, rotating electric machine, and air conditioner
GB2546177A (en) * 2014-10-22 2017-07-12 Mitsubishi Electric Corp Rotor of rotating electrical machine, rotating electrical, machine and air conditioning device
US10298091B2 (en) 2014-10-22 2019-05-21 Mitsubishi Electric Corporation Rotor of rotating motor, rotating motor, and air-conditioning apparatus
GB2546177B (en) * 2014-10-22 2021-04-07 Mitsubishi Electric Corp Rotor of rotating motor, rotating motor, and air-conditioning apparatus

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