JP2004147395A - Permanent magnet type synchronous motor - Google Patents

Permanent magnet type synchronous motor Download PDF

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Publication number
JP2004147395A
JP2004147395A JP2002307779A JP2002307779A JP2004147395A JP 2004147395 A JP2004147395 A JP 2004147395A JP 2002307779 A JP2002307779 A JP 2002307779A JP 2002307779 A JP2002307779 A JP 2002307779A JP 2004147395 A JP2004147395 A JP 2004147395A
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Prior art keywords
permanent magnet
rotor
synchronous motor
resin
permanent magnets
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Granted
Application number
JP2002307779A
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Japanese (ja)
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JP4160812B2 (en
Inventor
Katsutoshi Fujita
藤田　克俊
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Hitachi Appliances Inc
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Hitachi Home and Life Solutions Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To lighten stress which arises when fixing a permanent magnet by resin molding. <P>SOLUTION: In a permanent magnet type synchronous motor which has a rotor and a stator, the rotor is equipped with a plurality of permanent magnets around itself. It has a comb-shaped magnet press in axial direction of the permanent magnets, which prevents the cracks or cracking of resin or the permanent magnets, idling, etc. without fail, and the plate-shaped permanent magnets can be fixed to the rotor, whereby the highly reliable rotor for the permanent magnet type synchronous motor can be obtained. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、永久磁石式同期電動機に関する。
【０００２】
【従来の技術】
高効率、省エネ、小型化等の目的から、永久磁石を使用する永久磁石式同期電動機の需要は増加しており、信頼性が高く確実に永久磁石を回転子へ固定する方法が従来からの課題であった。
【０００３】
回転子は出力軸と回転子鉄心が焼嵌め等により一体型となっており、出力軸には玉軸受が装着されており、玉軸受はハウジングやエンドブラケットにより位置決め固定されて回転する。
【０００４】
回転子に複数の板状永久磁石を有する永久磁石式同期電動機において板状永久磁石を回転子鉄心外周に具備させる為に、従来は接着剤や、リング状の固定具によるはめ込み式による固定方法が一般的であった。
【０００５】
しかし、前記従来の両固定方法は強度や寸法の管理が非常に困難であり、長時間の高温高速回転及び、悪環境における使用により劣化し、板状永久磁石の剥離や脱落が発生する。これまでに多数の不良や、事故を起こしてきた。
又、樹脂成形による固定方法においては、高効率等の目的により板状永久磁石が大きくなり固定子鉄心の積層方向より長くなることがある。樹脂成形した場合樹脂、回転子鉄心、永久磁石のそれぞれに成形直後からの冷却又は、運転中の温度変化等により応力が発生し、永久磁石や成形された樹脂にひびや割れが発生する。
又、樹脂成形だけでは回転により永久磁石と回転子鉄心の間における空転に対して配慮されていなかった。さらに、電動機の特性として発熱がある、この発熱による温度上昇を低減することは電動機では重要であり困難である。
【０００６】
【発明が解決しようとする課題】
複数の板状永久磁石を複数使用する回転子からなる永久磁石式同期電動機において、板状永久磁石を信頼性が高く確実に回転子へ固定する方法が課題であり、それらを解決する為に樹脂成形がある。
【０００７】
前記従来技術は、樹脂成形した場合樹脂、回転子鉄心、永久磁石のそれぞれに成形直後からの冷却又は、運転中の温度変化により軸方向、径方向への熱収縮による応力が発生し、永久磁石や成形された樹脂にひびや割れが発生する。又、永久磁石を樹脂成形しただけでは回転により空転する可能性がある。さらに、電動機からの発熱による温度上昇を低減させることは重要であり困難であった。
本発明はこれらを解決することを目的とする。
【０００８】
【課題を解決するための手段】
本発明は、回転子と、固定子を有する永久磁石式同期電動機であって、前記回転子はその外周に複数の永久磁石を備え、前期永久磁石の軸方向に櫛状の磁石押え部を有することを特徴とする。
【０００９】
【発明の実施の形態】
本発明の第１の実施例は、回転子と、固定子を有する永久磁石式同期電動機であって、回転子はその外周に複数の永久磁石を備え、永久磁石の軸方向に櫛状の磁石押え部を有することを特徴とする永久磁石式同期電動機にある。
【００１０】
本発明の第２の実施例は、さらに回転子は出力軸とプレス成型された鋼板を複数枚積層した固定子鉄心を一体としたものであり、回転子鉄心より長い板状の永久磁石を回転子外周に樹脂で固定したことを特徴とする永久磁石式同期電動機にある。
【００１１】
本発明の第３の実施例は、さらに回転子鉄心には空転防止穴を形成したことを特徴とする永久磁石式同期電動機にある。
【００１２】
（実施例）
以下、本発明の実施例を図により説明する。
図１は出力軸１とプレス成形した珪素鋼板を複数枚積層した回転子鉄心２と、回転子鉄心２より長い板状永久磁石３を回転子外周へ複数枚等間隔に樹脂４にて成形した全体図である。図２は図１の断面図。図３は図１の正面図であり、図４は図３のＱ部拡大図である。
【００１３】
応力は軸方向と径方向の合成力になり、これらを回避させることが必要である。応力緩和構造とする為に永久磁石３の両端面３−ａには、櫛形状に複数の磁石押え部５を構成している。磁石押え部５と磁石押え部５の両端部６は独立しており、複数の磁石押え部５もそれぞれが独立している。又、永久磁石の両端に樹脂４は形成しない、従ってそれぞれが独立している磁石押え部５はバネ状の動きを有することになる。これにより軸方向と径方向に発生する応力を緩和させることが出来る。
【００１４】
樹脂成形時や永久磁石式同期電動機の温度変化等により発生する樹脂４の熱収縮力により樹脂４、永久磁石３に応力が発生するが、磁石押え部５がバネ状の動きを有することにより熱収縮力は回避されて応力の発生は緩和される、従って樹脂４、永久磁石３に発生するひびや割れを防ぐことが出来る。　　又、高温高速に耐える為には回転子鉄心２の外周に具備した永久磁石３を樹脂４で押える必要がある。樹脂４で永久磁石３の外周を全体的に押えると前記と同じく応力で樹脂４、永久磁石３にひびや割れが発生する為に、磁石押え部７は永久磁石３の外周の一部分のみに形成させる事とする。これにより、前述の磁石押え部５による効果に対し軸方向と径方向への応力緩和にさらに効果を出すことが出来る。
【００１５】
磁石押え部７を永久磁石３の外周の一部分のみに形成させる事により最小限の保持力を得ることが出来、かつ、樹脂４と永久磁石３にひびや割れが発生することを防ぐことが出来る。
【００１６】
さらに、プレス成形した珪素鋼板を積層した回転子鉄心２に貫通又は、貫通していない空転防止穴８を１個以上設けることにより、この空転防止穴８へ樹脂４が流れ込み空転防止構造を形成し空転を防止することが出来る。空転防止穴８はプレス成形時同時に設ける。
【００１７】
さらに、磁石押え部５の形状が放熱フィンと同様になり、樹脂４の表面積は増加した。従って放熱効果が良くなり、永久磁石式同期電動機の温度上昇を低減させることが出来る。
【００１８】
【発明の効果】
本発明によれば永久磁石端面にバネ状の動きを有する磁石押え部を樹脂形成することにより、又、外周には永久磁石を樹脂で押える部分を一部分とすることにより、樹脂成形や永久磁石式同期電動機運転中の温度変化等により発生する軸方向、径方向の応力を緩和させ高速運転に必要な保持力も得ることが出来る。かつ、固定子鉄心に穴を設け、樹脂を流し込むことにより、空転防止構造を形成し空転を防止することが出来る。さらに、バネ状の形状が放熱フィンと同様になり樹脂の表面積が増加したことにより永久磁石式同期電動機の温度上昇を低減できる。
永久磁石を確実に固定し信頼性が高く、割れや剥離等の問題を解決し、かつ、温度上昇を低減できる本発明による効果は非常に大きい。
【図面の簡単な説明】
【図１】本発明の実施例に係わる全体図である。
【図２】前記図１の断面図である。
【図３】前記図１の正面図である。
【図４】前記図３のＱ部拡大図である。
【符号の説明】
１…出力軸、２…回転子鉄心、３…永久磁石、３−ａ…永久磁石端面、４…樹脂、５…磁石押え部、６…磁石押え部５の両端部、７…磁石押え部、８…空転防止穴[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a permanent magnet synchronous motor.
[0002]
[Prior art]
The demand for permanent magnet type synchronous motors that use permanent magnets is increasing for the purpose of high efficiency, energy saving, miniaturization, etc., and a method for fixing the permanent magnets to the rotor with high reliability and certainty has been a conventional problem. Met.
[0003]
In the rotor, an output shaft and a rotor iron core are integrated by shrink fitting or the like, and a ball bearing is mounted on the output shaft. The ball bearing is positioned and fixed by a housing or an end bracket and rotates.
[0004]
Conventionally, in order to equip the outer periphery of the rotor core with the plate-shaped permanent magnets in a permanent magnet synchronous motor having a plurality of plate-shaped permanent magnets in the rotor, a fixing method using an adhesive or a ring-shaped fixing tool has been conventionally used. Was common.
[0005]
However, it is very difficult to control the strength and dimensions of the conventional fixing method, and the method is deteriorated by long-time high-speed rotation and use in a bad environment, and the plate-shaped permanent magnet is peeled or dropped. It has caused many defects and accidents.
Further, in the fixing method by resin molding, the plate-shaped permanent magnet may become large for the purpose of high efficiency or the like, and may be longer than the lamination direction of the stator core. In the case of resin molding, stress is generated in each of the resin, the rotor core, and the permanent magnet due to cooling immediately after molding or a temperature change during operation, and cracks and cracks occur in the permanent magnet and the molded resin.
In addition, the resin molding alone does not take into consideration idling between the permanent magnet and the rotor core due to rotation. Further, heat is generated as a characteristic of the electric motor. It is important and difficult to reduce a rise in temperature due to the generated heat.
[0006]
[Problems to be solved by the invention]
In a permanent magnet synchronous motor consisting of a rotor using a plurality of plate-shaped permanent magnets, there is a problem in how to fix the plate-shaped permanent magnets to the rotor with high reliability and reliability. There is molding.
[0007]
In the prior art, when resin is molded, the resin, the rotor core, and the permanent magnet are cooled immediately after molding or a temperature change during operation causes stress due to thermal shrinkage in an axial direction and a radial direction. And cracks and cracks occur in the molded resin. In addition, if the permanent magnet is simply formed by resin molding, the permanent magnet may run idle due to rotation. Further, it is important and difficult to reduce the temperature rise due to the heat generated from the electric motor.
The present invention aims to solve these problems.
[0008]
[Means for Solving the Problems]
The present invention is a permanent magnet synchronous motor having a rotor and a stator, wherein the rotor has a plurality of permanent magnets on its outer periphery, and has a comb-shaped magnet holding portion in the axial direction of the permanent magnet. It is characterized by the following.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention is a permanent magnet type synchronous motor having a rotor and a stator, wherein the rotor has a plurality of permanent magnets on its outer periphery, and a comb-shaped magnet in the axial direction of the permanent magnet. A permanent magnet type synchronous motor having a holding portion.
[0010]
In the second embodiment of the present invention, the rotor further comprises an output shaft and a stator core in which a plurality of press-formed steel plates are laminated, and a plate-shaped permanent magnet longer than the rotor core is rotated. The permanent magnet synchronous motor is characterized by being fixed to the outer periphery of the armature with resin.
[0011]
A third embodiment of the present invention is a permanent magnet type synchronous motor further characterized in that an anti-spin hole is formed in the rotor core.
[0012]
(Example)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a rotor core 2 in which a plurality of press-formed silicon steel sheets are laminated with an output shaft 1, and a plurality of plate-like permanent magnets 3 longer than the rotor core 2 are formed on the outer periphery of the rotor with a resin 4 at regular intervals. It is an overall view. FIG. 2 is a sectional view of FIG. FIG. 3 is a front view of FIG. 1, and FIG. 4 is an enlarged view of a portion Q in FIG.
[0013]
The stress becomes a combined force in the axial direction and the radial direction, and it is necessary to avoid these. A plurality of magnet holding portions 5 are formed in a comb shape on both end surfaces 3-a of the permanent magnet 3 to provide a stress relaxation structure. The magnet holding portion 5 and both end portions 6 of the magnet holding portion 5 are independent, and the plurality of magnet holding portions 5 are also independent. Further, the resin 4 is not formed at both ends of the permanent magnet, so that the magnet holding portions 5 which are independent of each other have a spring-like movement. Thereby, the stress generated in the axial direction and the radial direction can be reduced.
[0014]
Stress is generated in the resin 4 and the permanent magnet 3 due to the thermal contraction force of the resin 4 generated at the time of resin molding or a temperature change of the permanent magnet type synchronous motor. However, the heat is generated by the magnet holding portion 5 having a spring-like movement. The shrinking force is avoided and the generation of stress is alleviated. Therefore, cracks and cracks generated in the resin 4 and the permanent magnet 3 can be prevented. Further, in order to withstand high temperature and high speed, it is necessary to press the permanent magnet 3 provided on the outer periphery of the rotor core 2 with the resin 4. When the resin 4 entirely presses the outer periphery of the permanent magnet 3, cracks and cracks occur in the resin 4 and the permanent magnet 3 due to the same stress as described above. Therefore, the magnet holding portion 7 is formed only on a part of the outer periphery of the permanent magnet 3. I will do it. Thereby, the effect of the magnet holding portion 5 can be further reduced in the axial and radial directions.
[0015]
By forming the magnet holding portion 7 only on a part of the outer periphery of the permanent magnet 3, a minimum holding force can be obtained, and the resin 4 and the permanent magnet 3 can be prevented from cracking or cracking. .
[0016]
Further, by providing one or more anti-spin holes 8 penetrating or not penetrating the rotor core 2 in which the press-formed silicon steel sheets are laminated, the resin 4 flows into the anti-spin holes 8 to form an anti-spin structure. Idling can be prevented. The anti-spin holes 8 are provided simultaneously with press forming.
[0017]
Further, the shape of the magnet holding portion 5 became similar to that of the radiation fin, and the surface area of the resin 4 increased. Therefore, the heat radiation effect is improved, and the temperature rise of the permanent magnet type synchronous motor can be reduced.
[0018]
【The invention's effect】
According to the present invention, by forming a magnet holding portion having a spring-like movement on the end surface of the permanent magnet with a resin, and forming a portion for holding the permanent magnet with the resin on the outer periphery as a part, resin molding or permanent magnet type Axial and radial stresses caused by temperature changes and the like during the operation of the synchronous motor are alleviated, and a holding force required for high-speed operation can be obtained. Further, by providing a hole in the stator core and pouring the resin, an idling prevention structure can be formed to prevent idling. Further, the spring-like shape becomes similar to the radiation fin, and the surface area of the resin is increased, so that the temperature rise of the permanent magnet type synchronous motor can be reduced.
The effect of the present invention, which can reliably fix the permanent magnet and has high reliability, can solve the problems such as cracking and peeling, and can reduce the temperature rise, is very large.
[Brief description of the drawings]
FIG. 1 is an overall view according to an embodiment of the present invention.
FIG. 2 is a sectional view of FIG. 1;
FIG. 3 is a front view of FIG. 1;
FIG. 4 is an enlarged view of a portion Q in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Output shaft, 2 ... Rotor iron core, 3 ... Permanent magnet, 3-a ... Permanent magnet end surface, 4 ... Resin, 5 ... Magnet holding part, 6 ... Both ends of magnet holding part 5, 7 ... Magnet holding part, 8: Anti-slip hole

Claims (3)

回転子と、固定子を有する永久磁石式同期電動機であって、
前記回転子はその外周に複数の永久磁石を備え、前記永久磁石の軸方向に櫛状の磁石押え部を有することを特徴とする永久磁石式同期電動機。A permanent magnet synchronous motor having a rotor and a stator,
A permanent magnet type synchronous motor, wherein the rotor has a plurality of permanent magnets on an outer periphery thereof, and has a comb-shaped magnet pressing portion in an axial direction of the permanent magnets. 請求項１において、前記回転子は出力軸とプレス成型された鋼板を複数枚積層した固定子鉄心を一体としたものであり、前記回転子鉄心より長い板状の前記永久磁石を前記回転子外周に樹脂で固定したことを特徴とする永久磁石式同期電動機。2. The rotor according to claim 1, wherein the rotor is formed by integrating an output shaft and a stator core formed by stacking a plurality of press-formed steel plates, and the plate-shaped permanent magnet, which is longer than the rotor core, is provided on the outer periphery of the rotor. Permanent magnet synchronous motor characterized by being fixed with resin. 請求項２において、前記回転子鉄心には空転防止穴を形成したことを特徴とする永久磁石式同期電動機。3. The permanent magnet synchronous motor according to claim 2, wherein an anti-spin hole is formed in the rotor core.
JP2002307779A 2002-10-23 2002-10-23 Permanent magnet synchronous motor Expired - Lifetime JP4160812B2 (en)

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007080888A1 (en) * 2006-01-10 2007-07-19 Mitsuba Corporation Rotating machine
JP2010141993A (en) * 2008-12-10 2010-06-24 Mitsuba Corp Magnet holder for rotary electric machine
EP2573917A2 (en) 2011-09-20 2013-03-27 Shinano Kenshi Kabushiki Kaisha Rotor of motor, method of producing the rotor, inner rotor-type brushless motor and method of producing the motor
US9246365B2 (en) * 2012-01-23 2016-01-26 Aisan Kogyo Kabushiki Kaisha Regulation of permanent magnet motion in a brushless motor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007080888A1 (en) * 2006-01-10 2007-07-19 Mitsuba Corporation Rotating machine
JP2010141993A (en) * 2008-12-10 2010-06-24 Mitsuba Corp Magnet holder for rotary electric machine
EP2573917A2 (en) 2011-09-20 2013-03-27 Shinano Kenshi Kabushiki Kaisha Rotor of motor, method of producing the rotor, inner rotor-type brushless motor and method of producing the motor
US9048715B2 (en) 2011-09-20 2015-06-02 Shinano Kenshi Kabushiki Kaisha Rotor of motor, method of producing the rotor, inner rotor-type brushless motor and method of producing the motor
US9246365B2 (en) * 2012-01-23 2016-01-26 Aisan Kogyo Kabushiki Kaisha Regulation of permanent magnet motion in a brushless motor

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