JP3689877B2 - Permanent magnet motor rotor - Google Patents

Permanent magnet motor rotor Download PDF

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Publication number
JP3689877B2
JP3689877B2 JP32841095A JP32841095A JP3689877B2 JP 3689877 B2 JP3689877 B2 JP 3689877B2 JP 32841095 A JP32841095 A JP 32841095A JP 32841095 A JP32841095 A JP 32841095A JP 3689877 B2 JP3689877 B2 JP 3689877B2
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permanent magnet
rotor
rotor core
buffer member
ring side
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JPH09149571A (en
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英明 國松
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Kusatsu Electric Co Ltd
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Kusatsu Electric Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、電動機の防振構造に関するものであり、特にエアコン等に使用される永久磁石電動機の回転子の防振装置に関するものである。
【０００２】
【従来の技術】
回転子を回転駆動する際、永久磁石の磁界によって、回転子を一定の位置に保持しょうとするいわゆるコギングトルクが発生し、軸及び永久磁石間に捩りを伴う共振が発生する問題がある。
【０００３】
【発明が解決しようとする課題】
本発明は、永久磁石電動機の回転子において、回転子構造を工夫することにより、電動機から発生する振動を低減するものであり、信頼性、防振性に優れる回転子を提供することを目的とする。
【０００４】
【課題を解決するための手段】
本発明の永久磁石電動機の回転子は、外周部に配した永久磁石と、中心部に設けられた軸を固定する回転子鉄心と、前記永久磁石と前記回転子鉄心との間の空隙部に略対応するように相互に突き合せるように挿入した２個の緩衝部材と、を備えた永久磁石電動機の回転子であって、
前記緩衝部材は前記永久磁石の内輪側に設けた段差部と前記回転子鉄心のそれぞれの端面に固定するための保持部及び該永久磁石と該回転子鉄心との間の前記空隙部に挿入するための挿入部との２つの部分から構成されており、前記２つの緩衝部材の挿入部を接合した寸法を前記永久磁石の内輪側及び前記回転子鉄心積厚寸法より長くすることにより、該緩衝部材の保持部と該永久磁石の内輪側及び該回転子鉄心のそれぞれの端面との間に隙間を設けた。
【０００５】
本発明の永久磁石電動機の回転子は、前記２個の緩衝部材の端面をそれぞれ押えて保持する、２つの押え板を備え得る。
【０００６】
本発明の永久磁石電動機の回転子は、前記永久磁石の内輪側および前記回転子鉄心の外輪側の形状をそれぞれ複数の凸部を有する形状とし、前記緩衝部材の挿入部分の形状を、該永久磁石の内輪側及び該回転子鉄心の外輪側に設けた凸部と略対応するように外周部と内周部に凹部を設ける形状とした。
【０００７】
本発明の永久磁石電動機の回転子は、前記緩衝部材の挿入部分の寸法を前記永久磁石の内径より外径を小さくし、前記回転子鉄心の外径より内径を大きくし得る。
。
【０００８】
本発明の永久磁石電動機の回転子は、前記押え板と接する前記緩衝部材の端面には複数の溝を設けた形状としてもよい。
【０００９】
本発明の永久磁石電動機の回転子は、上記複数の溝の幅形状を中心部を狭く、外周部に行くにつれ拡大されていく放射状としてもよい。
【００１０】
【発明の効果】
本発明の永久磁石電動機の回転子は、２つの緩衝部材４を永久磁石１と回転子鉄心２間に挿入する。この際発生する隙間６は、２つの緩衝部材４の挿入部４Ｂを接合した寸法を永久磁石の内輪側１Ａ及び回転子鉄心２積厚寸法より長くすることにより、緩衝部材の保持部の外周側４Ｅと永久磁石の内輪側１Ａの段差部１Ｂとまた緩衝部材の保持部の内周側４Ｆと回転子鉄心２のそれぞれの端面との間に設けられる。この隙間６を設けたので、押え板５を緩衝部材４に当接させて図２に示すように止め具７にて固定する際、図８に図示のように押え板５を両側から矢印方向に圧縮すると、最初に２つの緩衝部材の接合面９に力が加わり、反動として緩衝部材４は膨らんで前述の隙間６を塞ぐ状態となる。またこれと同時に、押え板５に圧縮力を加えると緩衝部材の保持部４Ａと永久磁石の内輪側１Ａと回転子鉄心２との端面の隙間６も塞ぐ状態となる。
【００１１】
その結果、電動機を回転駆動すると永久磁石１の回転力に脈動を生じさせるようなコギングトルクが発生しこのコギングトルクによって永久磁石１に回転むらが生じるが、この永久磁石の回転むらは緩衝部材４の緩衝作用によって軸には振動が伝わらない状態となる。しかも、緩衝部材４と永久磁石１及び回転子鉄心２との接合部には押え板５を固定する前は隙間６がある状態のため、緩衝部材４の挿入がやりやすく防振効果に優れている。
【００１２】
また、緩衝部材４の前述の押え板との当り面には複数の溝４Ｇを設けた形状としているた め、永久磁石１で発生したコギングトルク等と軸３先端に接続されているファン（図示せず）との共振を防止することができる。
【００１３】
【発明の実施の形態】
以下、本発明の一実施例を図面に基づき説明する。図１は本発明の永久磁石電動機の回転子の押え板にて防振ゴムや熱可塑性樹脂であるエラストマ−等の緩衝部材を固定する前の縦断面図であり、図２は本発明の永久磁石電動機の回転子の押え板にて緩衝部材を固定後の縦断面図であり、図３は図２のＸ−Ｘ線に沿う断面図であり、図４は本発明の永久磁石、回転子鉄心、緩衝部材、押え板の各部品の結合前の分解図である。各図において、それぞれ１は回転子の外周部分に配する永久磁石であり、２は軸３に固定する回転子鉄心であり、４はこれら２つの部品を連結する緩衝部材であり、５は防振ゴム等の緩衝部材を両端より挟みつけて固定する押え板である。
【００１４】
図で示すように、緩衝部材４は永久磁石の内輪側１Ａに設けた段差部１Ｂと回転子鉄心２のそれぞれの端面に固定するための保持部４Ａと永久磁石１と回転子鉄心２との間の隙間６に挿入するための挿入部４Ｂとの２つの部分から構成されており、この緩衝部材４の挿入部分４Ｂの形状を永久磁石の内輪側に設けた凸部１Ｃ及び回転子鉄心の外輪側に設けた凸部２Ａと略対応するように外周部と内周部に凹部４Ｃを設ける。
【００１５】
そして、緩衝部材の挿入部４Ｂの寸法を永久磁石１の内径より外径を小さく、また、回転子鉄心２の外径より内径を大きくして、緩衝部材４と永久磁石１と回転子鉄心２との間に隙間６を設ける。この隙間６は押え板５を緩衝部材４に当接させて止め具７を緩衝部材４に設けた貫通穴４Ｄに挿入してプッシュナット等の固定具８にて固定する際重要となる。
【００１６】
次に図４の部品の分解図に基づいて回転子の組立手順について説明する。中央部に軸（図示せず）を固定した回転子鉄心２の外周部に設けた凸部２Ａを緩衝部材４の内周部に設けた凹部４Ｃにはめ込んで、さらに、この２つの部品を結合した状態で緩衝部材４の外周部に設けた凹部４Ｃを永久磁石１の内輪側に設けた図３に示すように凸部１Ｃにはめ込んで、さらに、もう一方の緩衝部材４も同様に永久磁石１と回転子鉄心２の間にはめ込んで、緩衝部材の保持部４Ａと永久磁石の内輪側１Ａに設けた段差部１Ｂと回転子鉄心２のそれぞれの端面との間に両側ともに隙間を設ける。さらに、２つの緩衝部材４を挾持するように両側より押え板５を当接し、図２に示すように止め具７にて固定する。
【００１７】
図５は本発明の永久磁石と回転子鉄心間に緩衝部材をはめ込み、緩衝部材に押え板を固定前の要部断面図であり、図６は図５の状態にさらに緩衝部材に押え板を当接して両側より矢印方向に力を加えた固定後の要部断面図である。図５に図示のように２つの緩衝部材の挿入部分を接合した寸法を永久磁石の内輪側及び回転子鉄心積厚寸法とほぼ同等とし、緩衝部材の保持部の外周側４Ｅと永久磁石の内輪側の段差部１Ｂとまた緩衝部材の保持部の内周側４Ｆと回転子鉄心２のそれぞれの端面とは当接状態で保持する構成とする。
【００１８】
図５の状態で図６のように押え板５を両側より矢印方向に圧縮すると、２つの緩衝部材４が当接する接合面９には殆ど力が加わらず図６に図示のように緩衝部材の保持部４Ａと永久磁石１と回転子鉄心２との接触面に圧縮力が加わり、緩衝部材の保持部４Ａの緩衝作業によって軸には振動が伝わらない状態となる。
【００１９】
しかし、緩衝部材４と永久磁石１及び回転子鉄心２との接合部に隙間がないため、挿入がしずらく、また、２つの緩衝部材の当接部の圧縮力が弱いため、緩衝部材の保持部の外周部４Ｅと内周部４Ｆに圧縮力が加わり次に説明する図７、図８に比べて防振効果が弱い。
【００２０】
図７、図８はそれぞれ図５、図６を改良したもので、図７は本発明の永久磁石と回転子鉄心間に緩衝部材をはめ込み、緩衝部材に押え板を固定前の要部断面図であり、図８は図７の状態にさらに緩衝部材に押え板を当接して両側より矢印方向に力を加えた固定後の要部断面図である。
【００２１】
図７に図示のように２つの緩衝部材４を永久磁石１と回転子鉄心２間に挿入した際発生する隙間６は、押え板５を矢印方向に圧縮した際緩衝部材が膨らんで合致する隙間とし、また、２つの緩衝部材４の挿入部４Ｂを接合した寸法を永久磁石の内輪側１Ａ及び回転子鉄心２積厚寸法より長くすることにより、緩衝部材の保持部の外周側４Ｅと永久磁石の内輪側１Ａの段差部１Ｂとまた緩衝部材の保持部の内周側４Ｆと回転子鉄心２のそれぞれの端面との間に隙間６を設ける。この隙間６を設けたことにより、押え板５を緩衝部材４に当接させて図２に示すように止め具７にて固定する際、図８に図示のように押え板５を両側から矢印方向に圧縮すると、最初に２つの緩衝部材の接合面９に力が加わり、反動として緩衝部材４は膨らんで前述の隙間６を塞ぐ状態となるとともに、さらに、押え板５に圧縮力を加えると緩衝部材の保持部４Ａと永久磁石の内輪側１Ａと回転子鉄心２との端面の隙間６も塞ぐ状態となる。
【００２２】
その結果、電動機を回転駆動すると永久磁石１の回転力に脈動を生じさせるようなコギングトルクが発生しこのコギングトルクによって永久磁石１に回転むらが生じるが、この永久磁石の回転むらは緩衝部材４の緩衝作用によって軸には振動が伝わらない状態となる。しかも、緩衝部材４と永久磁石１及び回転子鉄心２との接合部には押え板５を固定する前は隙間６がある状態のため、緩衝部材４の挿入がやりやすく防振効果に優れている。
【００２３】
図９、図１０はそれぞれ緩衝部材の側面図と底面図であり、図１１、図１２はそれぞれ図９のＹ−Ｙ線に沿う断面図と図１１のＺ−Ｚ線に沿う断面図である。緩衝部材は図１０及び図１１に図示するように永久磁石の内輪側に設けた凸部１Ｃと回転子鉄心の外輪側に設けた凸部２Ａにそれぞれはめ込むように緩衝部材の外周部と内周部に設けた凹部４Ｃにはめ合わせる構成とするとともに、図９〜図１２に図示するように緩衝部材の保持部の外周側４Ｅは永久磁石の内輪側の段差部１Ｄに当接し、一方緩衝部材の保持部の内周側４Ｆは回転子鉄心２の端面に当接する構成とする。
【００２４】
また、図９及び図１１で図示するように、緩衝部材４の前述の押え板との当り面には複数の溝４Ｇを設けた形状としているため、永久磁石１で発生したコギングトルク等と軸３先端に接続されているファン（図示せず）との共振を防止することができる。つまり、軸と永久磁石間で振動の縁切りをして防振効果を得ている。
【００２５】
しかし、前述の押え板で両側から強く圧縮すると押え板を通して振動が前述の永久磁石から軸に伝わってしまう。本発明ではこの現象を抑えるために図９、図１１のように緩衝部材４の押え板と接触する面に溝４Ｇを設けて接触面積を減らして振動が伝わり難くするとともに、振動は回転方向なので、緩衝部材の溝４Ｇの幅形状を中心部を狭く、外周部に行くにつれ拡大されていく放射状とした。
【００２６】
また、単に接触面積を減らしているだけではなく、緩衝部材の保持部４Ａの押え板との当り面には交互に溝と突起部４Ｈとを設け、この突起部４Ｈの倒れにより振動が伝わりにくい構成となっている。
【００２７】
図１３は電動機の回転時に緩衝部材４と押え板５との動作状況を説明するための図であり、回転子を回転駆動する際、永久磁石の磁界によって、回転子を一定の位置に保持しょうとするいわゆるコギングトルクが発生し、軸及び永久磁石間に捩りを伴う共振が発生する問題があるが、常時コギングトルクが発生しその影響力により振動が生じるが緩衝部材の保持部４Ａの端面に放射状の溝４Ｇを設けているため、押え板と接触している突起部４Ｈが回転方向にかかわらず図１３ａ及び図１３ｂで図示の通り正逆に絶えず動作するため、永久磁石の影響力を軸に伝達しにくい構造になっている。
【図面の簡単な説明】
【図１】本発明の一実施例における押え板にて固定前の回転子の縦断面図である。
【図２】本発明の一実施例における押え板にて固定後の回転子の縦断面図である。
【図３】図２のＸ−Ｘ線に沿う断面図である。
【図４】本発明の一実施例における回転子の結合前の分解図である。
【図５】本発明の一実施例における押え板にて固定前の回転子の要部断面図である。
【図６】本発明の一実施例における押え板にて固定後の回転子の要部断面図である。
【図７】本発明の他の実施例における押え板にて固定前の回転子の要部断面図である。
【図８】本発明の他の実施例における押え板にて固定後の回転子の要部断面図である。
【図９】本発明の一実施例における緩衝部材の側面図である。
【図１０】本発明の一実施例における緩衝部材の底面図である。
【図１１】図９のＹ−Ｙ線に沿う断面図である。
【図１２】図１１のＺ−Ｚ線に沿う断面図である。
【図１３】本発明の一実施例における緩衝部材と押え板との動作状況説明図である。
【図１４】従来の回転子の縦断面図である。
【符号の説明】
１ 永久磁石
１Ａ 永久磁石の内輪側
１Ｂ 段差部
１Ｃ 永久磁石の凸部
２ 回転子鉄心
２Ａ 回転子鉄心の凸部
３ 軸
４ 緩衝部材
４Ａ 保持部
４Ｂ 挿入部
４Ｃ 凹部
４Ｄ 貫通穴
４Ｅ 保持部の外周側
４Ｆ 保持部の内周側
４Ｇ 溝
４Ｈ 突起部
５ 押え板
６ 隙間
７ 止め具
８ 固定具
９ 緩衝部材の接合面 [0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-vibration structure for an electric motor, and more particularly to an anti-vibration device for a rotor of a permanent magnet electric motor used for an air conditioner or the like.
[0002]
[Prior art]
When the rotor is driven to rotate, there is a problem that a so-called cogging torque is generated by the magnetic field of the permanent magnet so as to hold the rotor at a fixed position, and resonance with torsion occurs between the shaft and the permanent magnet.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to provide a rotor that is excellent in reliability and vibration proofing by reducing the vibration generated from the motor by devising the rotor structure in the rotor of the permanent magnet motor. To do.
[0004]
[Means for Solving the Problems]
The rotor of the permanent magnet motor of the present invention includes a permanent magnet disposed on the outer peripheral portion, a rotor core that fixes a shaft provided in the center, and a gap between the permanent magnet and the rotor core. A rotor of a permanent magnet electric motor comprising: two cushioning members inserted so as to face each other so as to substantially correspond to each other;
The buffer member is inserted into a stepped portion provided on the inner ring side of the permanent magnet, a holding portion for fixing to each end face of the rotor core, and a gap between the permanent magnet and the rotor core. The insertion part of the two buffer members is made longer than the inner ring side of the permanent magnet and the rotor core stacking dimension. A gap was provided between the holding portion of the member, the inner ring side of the permanent magnet, and each end face of the rotor core.
[0005]
The rotor of the permanent magnet electric motor of the present invention can include two presser plates that press and hold the end surfaces of the two buffer members.
[0006]
In the rotor of the permanent magnet motor of the present invention, the inner ring side of the permanent magnet and the outer ring side of the rotor core each have a plurality of convex portions, and the shape of the insertion portion of the buffer member is the permanent magnet. The outer peripheral portion and the inner peripheral portion are provided with concave portions so as to substantially correspond to the convex portions provided on the inner ring side of the magnet and the outer ring side of the rotor core.
[0007]
In the rotor of the permanent magnet motor according to the present invention, the outer diameter of the insertion portion of the buffer member can be made smaller than the inner diameter of the permanent magnet, and the inner diameter can be made larger than the outer diameter of the rotor core.
.
[0008]
The rotor of the permanent magnet motor according to the present invention may have a shape in which a plurality of grooves are provided on an end surface of the buffer member in contact with the pressing plate.
[0009]
In the rotor of the permanent magnet motor of the present invention, the width shape of the plurality of grooves may be a radial shape in which the central portion is narrowed and enlarged toward the outer peripheral portion.
[0010]
【The invention's effect】
In the rotor of the permanent magnet motor of the present invention, two buffer members 4 are inserted between the permanent magnet 1 and the rotor core 2. The gap 6 generated at this time is made longer than the inner ring side 1A of the permanent magnet and the rotor core 2 stacking thickness dimension by joining the insertion portions 4B of the two buffer members 4 to the outer peripheral side of the buffer member holding portion. 4E, the step portion 1B on the inner ring side 1A of the permanent magnet, the inner peripheral side 4F of the holding portion of the buffer member, and the respective end surfaces of the rotor core 2 are provided. Since the gap 6 is provided, when the presser plate 5 is brought into contact with the buffer member 4 and fixed by the stopper 7 as shown in FIG. 2, the presser plate 5 is viewed from both sides in the direction of the arrow as shown in FIG. When compressed, the force is first applied to the joint surfaces 9 of the two buffer members, and as a reaction, the buffer member 4 swells and closes the gap 6 described above. At the same time, when a compressive force is applied to the presser plate 5, the gap 6 between the end faces of the holding portion 4A of the buffer member, the inner ring side 1A of the permanent magnet, and the rotor core 2 is also closed.
[0011]
As a result, when the motor is driven to rotate, a cogging torque that causes pulsation in the rotational force of the permanent magnet 1 is generated, and this cogging torque causes uneven rotation of the permanent magnet 1. Due to the buffering action, vibration is not transmitted to the shaft. Moreover, since there is a gap 6 before the presser plate 5 is fixed at the joint between the buffer member 4 and the permanent magnet 1 and the rotor core 2, the buffer member 4 can be easily inserted and has excellent vibration-proofing effect. Yes.
[0012]
Also, the fan (Fig. The contact surface which is connected a plurality of order to have the the provided shape grooves 4G, the cogging torque or the like and the shaft 3 distal generated by the permanent magnet 1 of the aforementioned pressing plate of the cushioning member 4 (Not shown) can be prevented.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view before a shock-absorbing rubber or a cushioning member such as an elastomer, which is a thermoplastic resin, is fixed by a retainer plate of a rotor of a permanent magnet motor of the present invention. FIG. FIG. 3 is a longitudinal sectional view after the buffer member is fixed by a retainer plate of a rotor of a magnet motor, FIG. 3 is a sectional view taken along line XX in FIG. 2, and FIG. 4 is a permanent magnet and rotor according to the present invention. FIG. 5 is an exploded view of the iron core, the buffer member, and the presser plate before joining. In each figure, 1 is a permanent magnet disposed on the outer peripheral portion of the rotor, 2 is a rotor core fixed to the shaft 3, 4 is a buffer member for connecting these two parts, and 5 is a protection member. It is a presser plate that clamps and fixes a buffer member such as a vibration rubber from both ends.
[0014]
As shown in the figure, the buffer member 4 includes a stepped portion 1B provided on the inner ring side 1A of the permanent magnet and a holding portion 4A for fixing to the respective end faces of the rotor core 2, the permanent magnet 1, and the rotor core 2. The insertion portion 4B is inserted into the gap 6 between the convex portion 1C provided on the inner ring side of the permanent magnet and the rotor core. Concave portions 4C are provided on the outer peripheral portion and the inner peripheral portion so as to substantially correspond to the convex portion 2A provided on the outer ring side.
[0015]
The size of the insertion part 4B of the buffer member is made smaller than the inner diameter of the permanent magnet 1 and larger than the outer diameter of the rotor core 2, so that the buffer member 4, the permanent magnet 1 and the rotor core 2 are larger. A gap 6 is provided between the two. The gap 6 becomes important when the presser plate 5 is brought into contact with the buffer member 4 and the stopper 7 is inserted into the through hole 4D provided in the buffer member 4 and is fixed by the fixture 8 such as a push nut.
[0016]
Next, the assembly procedure of the rotor will be described based on the exploded view of the components in FIG. The convex part 2A provided on the outer peripheral part of the rotor core 2 having a shaft (not shown) fixed at the center part is fitted into the concave part 4C provided on the inner peripheral part of the buffer member 4, and the two parts are further coupled. In this state, the concave portion 4C provided on the outer peripheral portion of the buffer member 4 is fitted into the convex portion 1C as shown in FIG. 3 provided on the inner ring side of the permanent magnet 1, and the other buffer member 4 is similarly configured with the permanent magnet. 1 and the rotor core 2, and a gap is provided on both sides between the holding portion 4 </ b> A of the buffer member and the stepped portion 1 </ b> B provided on the inner ring side 1 </ b> A of the permanent magnet and each end surface of the rotor core 2. Further, the holding plate 5 is brought into contact with both sides so as to hold the two buffer members 4 and fixed with a stopper 7 as shown in FIG.
[0017]
FIG. 5 is a cross-sectional view of the main part before the buffer member is fitted between the permanent magnet and the rotor core of the present invention and the presser plate is fixed to the buffer member, and FIG. 6 is a state where the presser plate is further attached to the buffer member in the state of FIG. It is principal part sectional drawing after fixation which contact | abutted and applied force to the arrow direction from both sides. As shown in FIG. 5, the dimension where the insertion portions of the two buffer members are joined is made substantially equal to the inner ring side of the permanent magnet and the rotor core thickness, and the outer peripheral side 4E of the holding part of the buffer member and the inner ring of the permanent magnet The side step portion 1B, the inner peripheral side 4F of the holding portion of the buffer member, and the respective end surfaces of the rotor core 2 are held in contact with each other.
[0018]
When the presser plate 5 is compressed from both sides in the direction of the arrow as shown in FIG. 6 in the state of FIG. 5, almost no force is applied to the joint surface 9 where the two buffer members 4 abut, as shown in FIG. A compressive force is applied to the contact surfaces of the holding portion 4A, the permanent magnet 1, and the rotor core 2, and the vibration is not transmitted to the shaft by the buffering operation of the holding portion 4A of the buffer member.
[0019]
However, since there is no gap at the joint between the buffer member 4 and the permanent magnet 1 and the rotor core 2, the insertion is difficult, and the compressive force of the contact portions of the two buffer members is weak. A compressive force is applied to the outer peripheral portion 4E and the inner peripheral portion 4F of the holding portion, and the vibration-proofing effect is weaker than those shown in FIGS.
[0020]
FIGS. 7 and 8 are improvements of FIGS. 5 and 6, respectively. FIG. 7 is a cross-sectional view of a main part before the buffer member is fitted between the permanent magnet and the rotor core of the present invention and the presser plate is fixed to the buffer member. FIG. 8 is a cross-sectional view of the main part after fixing, in which the presser plate is further brought into contact with the buffer member in the state of FIG.
[0021]
As shown in FIG. 7, the gap 6 generated when the two buffer members 4 are inserted between the permanent magnet 1 and the rotor core 2 is a gap in which the buffer members swell and match when the presser plate 5 is compressed in the arrow direction. In addition, by making the dimension in which the insertion portions 4B of the two buffer members 4 are joined longer than the inner ring side 1A of the permanent magnet and the rotor core 2 thickness, the outer peripheral side 4E of the buffer member holding portion and the permanent magnet A gap 6 is provided between the step portion 1B on the inner ring side 1A, the inner peripheral side 4F of the holding portion of the buffer member, and the respective end surfaces of the rotor core 2. By providing the gap 6, when the presser plate 5 is brought into contact with the buffer member 4 and fixed by the stopper 7 as shown in FIG. 2, the presser plate 5 is shown with arrows from both sides as shown in FIG. When compressing in the direction, first, a force is applied to the joint surface 9 of the two buffer members, and as a reaction, the buffer member 4 swells and closes the gap 6 described above, and further, a compression force is applied to the presser plate 5. The gap 6 between the end faces of the buffer member holding portion 4A, the inner ring side 1A of the permanent magnet, and the rotor core 2 is also closed.
[0022]
As a result, when the motor is driven to rotate, a cogging torque that causes pulsation in the rotational force of the permanent magnet 1 is generated, and this cogging torque causes uneven rotation of the permanent magnet 1. Due to the buffering action, vibration is not transmitted to the shaft. Moreover, since there is a gap 6 before the presser plate 5 is fixed at the joint between the buffer member 4 and the permanent magnet 1 and the rotor core 2, the buffer member 4 can be easily inserted and has excellent vibration-proofing effect. Yes.
[0023]
FIGS. 9 and 10 are a side view and a bottom view of the buffer member, respectively, and FIGS. 11 and 12 are a cross-sectional view taken along line YY in FIG. 9 and a cross-sectional view taken along line ZZ in FIG. . As shown in FIGS. 10 and 11, the buffer member is fitted into the convex portion 1 </ b> C provided on the inner ring side of the permanent magnet and the convex portion 2 </ b> A provided on the outer ring side of the rotor core, respectively. The outer peripheral side 4E of the holding portion of the buffer member is in contact with the step portion 1D on the inner ring side of the permanent magnet, while the buffer member is fitted to the recess 4C provided in the portion, as shown in FIGS. The inner peripheral side 4F of the holding portion is configured to abut against the end face of the rotor core 2.
[0024]
Further, as shown in FIGS. 9 and 11, since the contact surface of the buffer member 4 with the above-described presser plate is formed with a plurality of grooves 4G, the cogging torque generated by the permanent magnet 1 and the shaft 3 Resonance with a fan (not shown) connected to the tip can be prevented. In other words, vibration is cut between the shaft and the permanent magnet to obtain a vibration isolation effect.
[0025]
However, if the above-mentioned presser plate is strongly compressed from both sides, vibration is transmitted from the above-mentioned permanent magnet to the shaft through the presser plate. In the present invention, in order to suppress this phenomenon, as shown in FIGS. 9 and 11, a groove 4G is provided on the surface of the buffer member 4 that comes into contact with the presser plate to reduce the contact area so that the vibration is difficult to be transmitted. The width shape of the groove 4G of the buffer member is made to be a radial shape that is narrowed at the central portion and enlarged as it goes to the outer peripheral portion.
[0026]
In addition to simply reducing the contact area, grooves and protrusions 4H are alternately provided on the contact surface of the holding part 4A of the buffer member with the pressing plate, and vibrations are not easily transmitted due to the inclination of the protrusions 4H. It has a configuration.
[0027]
FIG. 13 is a diagram for explaining the operation state of the buffer member 4 and the presser plate 5 during rotation of the electric motor. When the rotor is driven to rotate, the rotor is held at a fixed position by the magnetic field of the permanent magnet. The so-called cogging torque is generated and resonance with torsion occurs between the shaft and the permanent magnet. However, the cogging torque is always generated and vibration is generated due to its influence, but the end face of the holding portion 4A of the buffer member is generated. Since the radial grooves 4G are provided, the protrusions 4H that are in contact with the presser plate operate continuously in the forward and reverse directions as shown in FIGS. 13a and 13b regardless of the rotation direction. The structure is difficult to transmit to.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a rotor before fixing with a presser plate according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a rotor after being fixed by a presser plate in one embodiment of the present invention.
3 is a cross-sectional view taken along line XX of FIG.
FIG. 4 is an exploded view before coupling of rotors in one embodiment of the present invention.
FIG. 5 is a cross-sectional view of a main part of a rotor before being fixed by a presser plate according to an embodiment of the present invention.
FIG. 6 is a cross-sectional view of the main part of the rotor after being fixed by the presser plate in one embodiment of the present invention.
FIG. 7 is a cross-sectional view of a main part of a rotor before being fixed by a presser plate according to another embodiment of the present invention.
FIG. 8 is a cross-sectional view of a main part of a rotor after being fixed by a presser plate according to another embodiment of the present invention.
FIG. 9 is a side view of a buffer member according to an embodiment of the present invention.
FIG. 10 is a bottom view of the buffer member according to the embodiment of the present invention.
11 is a cross-sectional view taken along line YY in FIG.
12 is a cross-sectional view taken along line ZZ in FIG.
FIG. 13 is an explanatory view of the operation state of the buffer member and the presser plate in one embodiment of the present invention.
FIG. 14 is a longitudinal sectional view of a conventional rotor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Permanent magnet 1A Inner ring side 1B of permanent magnet Step part 1C Convex part 2 of permanent magnet 2 Rotor core 2A Convex part 3 of rotor core 4 Shaft 4 Buffer member 4A Holding part 4B Insertion part 4C Recessed hole 4E Outer periphery of holding part Side 4F Inner peripheral side 4G of holding part Groove 4H Protrusion part 5 Holding plate 6 Gap 7 Stopper 8 Fixing tool 9 Joining surface of buffer member

Claims (6)

外周部に配した永久磁石と、A permanent magnet arranged on the outer periphery,
中心部に設けられた軸を固定する回転子鉄心と、A rotor core that fixes a shaft provided in the center;
前記永久磁石と前記回転子鉄心との間の空隙部に略対応するように相互に突き合せるように挿入した２個の緩衝部材と、Two buffer members inserted so as to abut each other so as to substantially correspond to the gap between the permanent magnet and the rotor core;
を備えた永久磁石電動機の回転子であって、A rotor of a permanent magnet electric motor with
前記緩衝部材は前記永久磁石の内輪側に設けた段差部と前記回転子鉄心のそれぞれの端面に固定するための保持部及び該永久磁石と該回転子鉄心との間の前記空隙部に挿入するための挿入部との２つの部分から構成されており、The buffer member is inserted into a step portion provided on the inner ring side of the permanent magnet, a holding portion for fixing to each end face of the rotor core, and the gap portion between the permanent magnet and the rotor core. It consists of two parts with an insertion part for
前記２つの緩衝部材の挿入部を接合した寸法を前記永久磁石の内輪側及び前記回転子鉄心積厚寸法より長くすることにより、By making the dimension of joining the insertion portions of the two buffer members longer than the inner ring side of the permanent magnet and the rotor core stack thickness dimension,
該緩衝部材の保持部と該永久磁石の内輪側及び該回転子鉄心のそれぞれの端面との間に隙間を設けた、永久磁石電動機の回転子。A rotor of a permanent magnet motor, wherein a gap is provided between the holding portion of the buffer member and the inner ring side of the permanent magnet and each end face of the rotor core. 前記２個の緩衝部材の端面をそれぞれ押えて保持する、２つの押え板を備える、請求項１に記載の永久磁石電動機の回転子。The rotor of a permanent magnet electric motor according to claim 1, comprising two pressing plates that respectively hold and hold the end surfaces of the two buffer members. 前記永久磁石の内輪側および前記回転子鉄心の外輪側の形状をそれぞれ複数の凸部を有する形状とし、Each of the inner ring side of the permanent magnet and the outer ring side of the rotor core has a shape having a plurality of convex portions,
前記緩衝部材の挿入部分の形状を、該永久磁石の内輪側及び該回転子鉄心の外輪側に設けた凸部と略対応するように外周部と内周部に凹部を設ける形状とした、The shape of the insertion portion of the buffer member is a shape in which concave portions are provided on the outer peripheral portion and the inner peripheral portion so as to substantially correspond to the convex portions provided on the inner ring side of the permanent magnet and the outer ring side of the rotor core.
請求項１または請求項２に記載の永久磁石電動機の回転子。The rotor of the permanent magnet electric motor according to claim 1 or 2. 前記緩衝部材の挿入部分の寸法を前記永久磁石の内径より外径を小さくし、The outer diameter of the insertion portion of the buffer member is made smaller than the inner diameter of the permanent magnet,
前記回転子鉄心の外径より内径を大きくした、The inner diameter is larger than the outer diameter of the rotor core,
請求項１乃至請求項３に記載の永久磁石電動機の回転子。The rotor of the permanent magnet electric motor according to claim 1. 前記押え板と接する前記緩衝部材の端面には複数の溝を設けた形状とした、In the end face of the buffer member in contact with the presser plate, a shape provided with a plurality of grooves,
請求項１乃至請求項４に記載の永久磁石電動機の回転子。The rotor of the permanent magnet electric motor according to claim 1. 請求項５に記載の複数の溝の幅形状を中心部を狭く、外周部に行くにつれ拡大されていく放射状とした、永久磁石電動機の回転子。The rotor of the permanent magnet motor which made the width | variety shape of the some groove | channel of Claim 5 narrow in the center part and became radial as it goes to an outer peripheral part.
JP32841095A 1995-11-22 1995-11-22 Permanent magnet motor rotor Expired - Lifetime JP3689877B2 (en)

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JP4304387B2 (en) * 1999-03-31 2009-07-29 株式会社富士通ゼネラル Electric motor rotor
KR100291213B1 (en) * 1999-08-10 2001-05-15 조성춘 Compact wheel generator, light-emitting wheel having the same, and manufacturing method therefor
JP2001186700A (en) * 1999-12-24 2001-07-06 Fujitsu General Ltd Electric motor
JP4547763B2 (en) * 2000-03-17 2010-09-22 株式会社富士通ゼネラル Motor rotor
JP2001327105A (en) * 2000-05-17 2001-11-22 Fujitsu General Ltd Rotor of motor and its manufacturing method
JP6855869B2 (en) * 2017-03-23 2021-04-07 株式会社富士通ゼネラル Permanent magnet motor
JP6786460B2 (en) * 2017-09-15 2020-11-18 株式会社東芝 Mounting structure, rotating machine, and air conditioner
JP7077986B2 (en) * 2019-02-15 2022-05-31 株式会社デンソー Embedded magnet type rotor
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