JP2016059254A - Rotary electric machine - Google Patents

Rotary electric machine Download PDF

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JP2016059254A
JP2016059254A JP2015013193A JP2015013193A JP2016059254A JP 2016059254 A JP2016059254 A JP 2016059254A JP 2015013193 A JP2015013193 A JP 2015013193A JP 2015013193 A JP2015013193 A JP 2015013193A JP 2016059254 A JP2016059254 A JP 2016059254A
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electric machine
rotor
stator
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JP6596827B2 (en
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和正 池田
Kazumasa Ikeda
和正 池田
智裕 内田
Tomohiro Uchida
智裕 内田
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Asmo Co Ltd
Denso Corp
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Asmo Co Ltd
Denso Corp
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Abstract

PROBLEM TO BE SOLVED: To reduce noise generated owing to resonance of a rotor and a stator of a rotary electric machine.SOLUTION: When a low-rigidity part 612b is formed at one least one place of a yoke cylinder part 612 of an outer rotor 6, a resonance mode of the outer rotor 6 includes two annular secondary modes such that positions of an anti-node and a node are fixed and shift from each other in a rotary electric machine rotating direction. The annular secondary mode appears at two resonance frequencies. Thus, the positions of the anti-node and node are fixed and also shift in the rotary electric machine rotating direction (i.e, multiple roots of an elliptic shape having the positions of the anti-node and node fixed), and part of electromagnetic force is not converted into vibration at the respective resonance frequencies, thereby reducing noise due to resonance of the outer rotor 6.SELECTED DRAWING: Figure 2

Description

本発明は、ロータおよびステータを備える回転電機に関するものである。   The present invention relates to a rotating electrical machine including a rotor and a stator.

従来、この種の回転電機（すなわち、電動機、発電機）として、例えば特許文献１に記載されたものがある。この特許文献１に記載された回転電機は、所謂アウターロータ式電動機であり、ヨークの円筒部の内周側に永久磁石が固定されたアウターロータと、鉄心にコイルが巻装されたステータとを備え、ステータが発生する電磁力によりアウターロータを回転させるようになっている。   Conventionally, as this type of rotating electric machine (that is, an electric motor or a generator), for example, there is one described in Patent Document 1. The rotating electrical machine described in Patent Document 1 is a so-called outer rotor type electric motor, and includes an outer rotor in which a permanent magnet is fixed on the inner peripheral side of a cylindrical portion of a yoke, and a stator in which a coil is wound around an iron core. And the outer rotor is rotated by electromagnetic force generated by the stator.

特開２０１３−１７６２０２号公報JP 2013-176202 A

アウターロータ式電動機は、ステータが発生する電磁力の周波数とアウターロータの共振周波数が一致したときに、共振が励起されて騒音となることが知られている。   It is known that an outer rotor type electric motor generates noise by exciting resonance when the frequency of electromagnetic force generated by the stator matches the resonance frequency of the outer rotor.

ここで、ステータが発生する電磁力（すなわち加振力）の分布は、楕円形（すなわち、円環２次モード）である。   Here, the distribution of the electromagnetic force (that is, the exciting force) generated by the stator is elliptical (that is, the circular secondary mode).

また、アウターロータのヨークは、偏心や電磁力分布の歪み発生を防止するため、出来るだけ精度良く軸対称に作られている。そして、軸対称のヨークを有するアウターロータは、回転方向のどの位置でも振動の腹になるため、腹と節の位置が固定されない楕円形の共振モード（すなわち、円環２次モード）となり、電磁力は１００％振動に変換され、アウターロータ共振に起因する騒音が極めて大きくなるという問題があった。   Further, the yoke of the outer rotor is made as axisymmetric as accurately as possible in order to prevent eccentricity and distortion of electromagnetic force distribution. The outer rotor having an axisymmetric yoke becomes an antinode of vibration at any position in the rotational direction, and thus becomes an elliptical resonance mode in which the positions of the antinodes and nodes are not fixed (that is, the circular secondary mode), and electromagnetic The force was converted to 100% vibration, and there was a problem that the noise due to the outer rotor resonance became extremely large.

さらに、アウターロータ式電動機において、ステータ共振に起因する騒音も発生する。さらにまた、アウターロータ式発電機、インナーロータ式回転電機、ロータにコイルが巻装されステータに永久磁石が固定された形式の回転電機においても、ロータやステータの共振に起因する騒音が極めて大きくなるという問題が発生する。   Further, in the outer rotor type electric motor, noise due to stator resonance is also generated. Furthermore, even in an outer rotor type generator, an inner rotor type rotating electrical machine, and a rotating electrical machine of a type in which a coil is wound around a rotor and a permanent magnet is fixed to a stator, noise due to resonance of the rotor and the stator becomes extremely large. The problem occurs.

本発明は上記点に鑑みて、回転電機におけるロータやステータの共振による騒音を低減することを目的とする。   In view of the above points, an object of the present invention is to reduce noise caused by resonance of a rotor and a stator in a rotating electrical machine.

上記目的を達成するため、請求項１に記載の発明では、ロータ（６、９）のヨーク円筒部（６１２）またはステータ（７、８）の鉄心（７１、８１）における回転電機回転方向の所定範囲毎の重量を所定範囲重量としたとき、ロータ（６、９）のヨーク円筒部またはステータの鉄心における回転電機回転方向の少なくとも一箇所に、残部とは所定範囲重量が異なる異重量部（６１２ｄ、６１３）、または残部とは剛性が異なる異剛性部（７１ａ、６１２ｂ、８１３）を備えることを特徴とする。   In order to achieve the above object, according to the first aspect of the present invention, in the yoke cylindrical portion (612) of the rotor (6, 9) or the iron core (71, 81) of the stator (7, 8), the predetermined rotational direction of the rotating electrical machine is determined. When the weight for each range is defined as the predetermined range weight, at least one portion in the rotational direction of the rotating electrical machine in the yoke cylindrical portion of the rotor (6, 9) or the stator iron core, the different weight portion (612d) having a predetermined range weight different from the remaining portion. 613), or different rigid portions (71a, 612b, 813) having different rigidity from the rest.

これによると、ロータまたはステータの共振モードとして、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向にずれた２つの円環２次モードが、２つの共振周波数において現れる。このように、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向にずれることにより、各々の共振周波数において電磁力の一部は振動に変換されなくなるため、ロータまたはステータの共振による騒音を低減することができる。   According to this, as the resonance mode of the rotor or stator, two annular secondary modes in which the positions of the antinodes and nodes are fixed and the antinodes and nodes are displaced from each other in the rotating electric machine rotation direction appear at two resonance frequencies. . In this way, since the positions of the antinodes and nodes are fixed and the antinodes and nodes are displaced from each other in the rotating electric machine rotation direction, a part of the electromagnetic force is not converted into vibration at each resonance frequency. Noise due to resonance can be reduced.

なお、この欄および特許請求の範囲で記載した各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。   In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

本発明の第１実施形態に係る回転電機の正面断面図である。It is front sectional drawing of the rotary electric machine which concerns on 1st Embodiment of this invention. 図１の回転電機におけるヨークのＡ矢視図である。It is an A arrow directional view of the yoke in the rotary electric machine of FIG. 図１のステータが発生する電磁力の分布を示す図である。It is a figure which shows distribution of the electromagnetic force which the stator of FIG. 1 generate | occur | produces. （ａ）は従来の回転電機におけるステータの電磁力がヨークに伝達される際の伝達関数、（ｂ）は第１実施形態に係る回転電機におけるステータの電磁力がヨークに伝達される際の伝達関数である。(A) is a transfer function when the electromagnetic force of the stator in the conventional rotating electrical machine is transmitted to the yoke, and (b) is a transmission function when the electromagnetic force of the stator in the rotating electrical machine according to the first embodiment is transmitted to the yoke. It is a function. 図１の回転電機におけるアウターロータの振動応答レベルと周波数との関係を示す図である。It is a figure which shows the relationship between the vibration response level and frequency of an outer rotor in the rotary electric machine of FIG. 本発明の第２実施形態に係る回転電機におけるステータを示す図である。It is a figure which shows the stator in the rotary electric machine which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係る回転電機におけるアウターロータのヨークを示す図である。It is a figure which shows the yoke of the outer rotor in the rotary electric machine which concerns on 3rd Embodiment of this invention. 本発明の第４実施形態に係る回転電機におけるアウターロータのヨークを示す図である。It is a figure which shows the yoke of the outer rotor in the rotary electric machine which concerns on 4th Embodiment of this invention. 本発明の第５実施形態に係る回転電機におけるアウターロータを示す図である。It is a figure which shows the outer rotor in the rotary electric machine which concerns on 5th Embodiment of this invention. 図９のアウターロータの素材を形成する工程を示す図である。It is a figure which shows the process of forming the raw material of the outer rotor of FIG. 本発明の第６実施形態に係る回転電機の正面断面図である。It is front sectional drawing of the rotary electric machine which concerns on 6th Embodiment of this invention. 図１１のステータのＣ−Ｃ断面図である。It is CC sectional drawing of the stator of FIG.

以下、本発明の実施形態について図に基づいて説明する。なお、以下の各実施形態相互において、互いに同一もしくは均等である部分には、図中、同一符号を付してある。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

（第１実施形態）
本発明の第１実施形態について説明する。図１、図２に示すように、本実施形態の回転電機は、アウターロータ式電動機であり、円筒部を有するベース１の内周側に第１軸受け２が装着され、ベース１に嵌合された円筒状の軸受けホルダ３の内周側に第２軸受け４が装着されている。そして、第１軸受け２および第２軸受け４により、回転軸５が回転自在に支持されている。 (First embodiment)
A first embodiment of the present invention will be described. As shown in FIGS. 1 and 2, the rotating electrical machine of the present embodiment is an outer rotor type electric motor, and a first bearing 2 is mounted on the inner peripheral side of a base 1 having a cylindrical portion and is fitted to the base 1. A second bearing 4 is mounted on the inner peripheral side of the cylindrical bearing holder 3. The rotating shaft 5 is rotatably supported by the first bearing 2 and the second bearing 4.

回転軸５には、アウターロータ６が圧入固定されている。このアウターロータ６は、金属製のヨーク６１と、ヨーク６１の内周側に固定された永久磁石６２とからなる。   An outer rotor 6 is press-fitted and fixed to the rotary shaft 5. The outer rotor 6 includes a metal yoke 61 and a permanent magnet 62 fixed to the inner peripheral side of the yoke 61.

ヨーク６１は、中心部に回転軸５が圧入されるとともに回転軸直交方向に延びる円盤状のヨーク板部６１１と、このヨーク板部６１１の外縁部から回転軸方向に延びる円筒状のヨーク円筒部６１２とを備え、有底円筒状になっている。   The yoke 61 includes a disc-shaped yoke plate portion 611 having a rotary shaft 5 press-fitted at the center thereof and extending in a direction orthogonal to the rotary shaft, and a cylindrical yoke cylindrical portion extending from the outer edge portion of the yoke plate portion 611 in the rotational axis direction. 612 and has a bottomed cylindrical shape.

また、ヨーク円筒部６１２の内周側には、ヨーク円筒部６１２の周方向（換言すると、回転電機回転方向）に沿って９０°間隔の等ピッチで、半円状の切欠部６１２ａが４個形成されている。そして、ヨーク円筒部６１２における切欠部６１２ａが形成された部位の剛性は、切欠部６１２ａが形成されていない部位の剛性よりも低くなっている。   Further, four semicircular cutouts 612a are formed at an equal pitch of 90 ° along the circumferential direction of the yoke cylindrical portion 612 (in other words, the rotating electrical machine rotating direction) on the inner peripheral side of the yoke cylindrical portion 612. Is formed. And the rigidity of the site | part in which the notch part 612a was formed in the yoke cylindrical part 612 is lower than the rigidity of the site | part in which the notch part 612a is not formed.

以下、ヨーク円筒部６１２における切欠部６１２ａが形成された部位を、低剛性部６１２ｂという。この低剛性部６１２ｂは、回転電機回転方向に沿って等ピッチに４個配置されている。なお、低剛性部６１２ｂは、本発明の異剛性部に相当する。   Hereinafter, the portion where the notch 612a is formed in the yoke cylindrical portion 612 is referred to as a low-rigidity portion 612b. Four low rigidity portions 612b are arranged at an equal pitch along the rotating electric machine rotation direction. The low rigidity portion 612b corresponds to the different rigidity portion of the present invention.

ベース１の円筒部の外周側には、鉄心７１にコイル７２を巻装したステータ７が固定されている。また、ステータ７は、ヨーク円筒部６１２の内側に配置されている。   A stator 7 in which a coil 72 is wound around an iron core 71 is fixed to the outer peripheral side of the cylindrical portion of the base 1. Further, the stator 7 is disposed inside the yoke cylindrical portion 612.

このように構成されたアウターロータ式電動機は、コイル７２に電力が供給されるとステータ７が電磁力を発生し（図３参照）、回転する電磁力を受けて回転軸５およびアウターロータ６が回転する。なお、図３の横軸θは、ステータ７における周方向角度（すなわち、周方向位置）である。   In the outer rotor type electric motor configured as described above, when electric power is supplied to the coil 72, the stator 7 generates an electromagnetic force (see FIG. 3), and the rotating shaft 5 and the outer rotor 6 receive the rotating electromagnetic force. Rotate. 3 is a circumferential angle (that is, a circumferential position) in the stator 7.

ここで、従来のアウターロータ式電動機のように、ヨークの剛性が回転電機回転方向に沿って均一である場合は、ヨークにおける回転電機回転方向のどの位置でも振動の腹になるため、図４（ａ）に示すように、ステータの電磁力がヨークに伝達される際の伝達関数は、ヨークにおける周方向角度θ（すなわち、周方向位置）にかかわらず一定になる。   Here, when the rigidity of the yoke is uniform along the rotating electric machine rotation direction as in a conventional outer rotor type electric motor, vibration occurs at any position in the rotating electric machine rotation direction in the yoke, and therefore, FIG. As shown in a), the transfer function when the electromagnetic force of the stator is transmitted to the yoke is constant regardless of the circumferential angle θ (that is, the circumferential position) in the yoke.

一方、本実施形態においては、低剛性部６１２ｂは振動の節になるため、ステータ７の電磁力がヨーク６１に伝達される際の伝達関数は、図４（ｂ）に示すように、ヨーク６１における周方向角度θ（すなわち、周方向位置）の変化に伴って変動する。   On the other hand, in the present embodiment, since the low-rigidity portion 612b becomes a vibration node, the transfer function when the electromagnetic force of the stator 7 is transmitted to the yoke 61 is as shown in FIG. Fluctuates with a change in the circumferential angle θ (ie, the circumferential position).

また、図５に示すように、本実施形態のように低剛性部６１２ｂを回転電機回転方向に沿って等ピッチに４個配置した場合、アウターロータ６の共振モードは、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向に４５°ずれた２つの円環２次モードとなり、その円環２次モードは２つの共振周波数において現れる。   Further, as shown in FIG. 5, when four low-rigidity portions 612b are arranged at an equal pitch along the rotating electric machine rotation direction as in this embodiment, the resonance mode of the outer rotor 6 is such that the positions of the belly and the node are the same. There are two circular secondary modes that are fixed and have their antinodes and nodes displaced from each other by 45 ° in the direction of rotation of the rotating electrical machine. The circular secondary modes appear at two resonance frequencies.

このように、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向にずれる（すなわち、腹と節の位置が固定された楕円形の重根にする）ことにより、各々の共振周波数において電磁力の一部は振動に変換されなくなるため、アウターロータ６の共振による騒音が低減される。   In this way, the positions of the abdomen and nodes are fixed and the positions of the abdomen and nodes are shifted from each other in the rotational direction of the rotating electrical machine (that is, an elliptical double root with the positions of the abdomen and nodes fixed) Since part of the electromagnetic force is not converted into vibration at the resonance frequency, noise due to resonance of the outer rotor 6 is reduced.

因みに、低剛性部６１２ｂが回転電機回転方向に沿って等ピッチに４個配置され、且つアウターロータ６における２つの共振周波数の差が３７Ｈｚとなるアウターロータ式電動機（以下、本実施形態電動機という）と、低剛性部６１２ｂがなくアウターロータの共振周波数が１つである従来のアウターロータ式電動機とについて、騒音を測定したところ、本実施形態電動機の騒音レベルは、従来のアウターロータ式電動機の騒音レベルよりも２．８ｄＢ（Ａ）下がった。   Incidentally, four low-rigidity portions 612b are arranged at an equal pitch along the rotating electric machine rotation direction, and an outer rotor type electric motor in which the difference between two resonance frequencies in the outer rotor 6 is 37 Hz (hereinafter referred to as the electric motor according to the present embodiment). When the noise was measured for the conventional outer rotor type motor without the low rigidity portion 612b and the resonance frequency of the outer rotor being one, the noise level of the electric motor of the present embodiment is the noise level of the conventional outer rotor type motor. It was 2.8 dB (A) lower than the level.

また、本実施形態では、複数の低剛性部６１２ｂのうち任意の低剛性部６１２ｂに対し、他の低剛性部６１２ｂのうちの１つが回転電機回転方向に沿って１８０°ずれた位置に配置されているため、アウターロータ６の回転方向の重量バランスがとれ、アンバランスによる振動や騒音が防止される。   Further, in the present embodiment, one of the other low-rigidity parts 612b is arranged at a position shifted by 180 ° along the rotating electric machine rotation direction with respect to an arbitrary low-rigidity part 612b among the plurality of low-rigidity parts 612b. Therefore, the weight balance in the rotation direction of the outer rotor 6 is achieved, and vibration and noise due to unbalance are prevented.

また、本実施形態のように、低剛性部６１２ｂを回転電機回転方向に沿って等ピッチに４個配置した場合、アウターロータ６における２つの共振周波数の差を、最大限に大きくすることができる。   Further, when four low-rigidity parts 612b are arranged at an equal pitch along the rotating electric machine rotation direction as in this embodiment, the difference between the two resonance frequencies in the outer rotor 6 can be maximized. .

なお、本実施形態においては、低剛性部６１２ｂを４個設けたが、低剛性部６１２ｂは１個でもよい。この場合でも、アウターロータ６の共振モードは、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向にずれた２つの円環２次モードとなるため、アウターロータ６の共振による騒音が低減される。   In the present embodiment, four low-rigidity portions 612b are provided, but one low-rigidity portion 612b may be provided. Even in this case, the resonance mode of the outer rotor 6 is two annular secondary modes in which the positions of the antinodes and nodes are fixed and the antinodes and nodes are displaced from each other in the rotating electric machine rotation direction. Noise due to resonance is reduced.

また、本実施形態においては、ヨーク円筒部６１２の内周側に切欠部６１２ａを形成したが、ヨーク円筒部６１２の外周側に切欠部６１２ａを形成してもよい。   In the present embodiment, the notch 612 a is formed on the inner peripheral side of the yoke cylindrical portion 612, but the notch 612 a may be formed on the outer peripheral side of the yoke cylindrical portion 612.

また、本実施形態においては、低剛性部６１２ｂを回転電機回転方向に沿って９０°間隔の等ピッチで４個設けたが、９０°間隔に配置した４個の低剛性部６１２ｂの位置とは異なる位置に、さらに低剛性部６１２ｂを形成してもよい。   In the present embodiment, four low-rigidity portions 612b are provided at an equal pitch of 90 ° along the rotating electric machine rotation direction, but the positions of the four low-rigidity portions 612b arranged at 90 ° intervals are as follows. Further, the low rigidity portion 612b may be formed at a different position.

ただし、この場合、さらに形成する低剛性部６１２ｂの数は、９０°間隔に配置した低剛性部６１２ｂの数（すなわち４個）と異ならせる。   However, in this case, the number of low-rigidity parts 612b to be further formed is different from the number of low-rigidity parts 612b arranged at 90 ° intervals (that is, four).

換言すると、低剛性部６１２ｂのうち任意の低剛性部の位置を点Ａ（１）とし、点Ａ１を基点として回転電機回転方向に沿って４５°ピッチの位置を点Ａ（２）〜点Ａ（８）としたとき、点Ａ（２ｎ−１）（ただし、ｎ＝１、２、３、４）に設けられた低剛性部の数と、点Ａ（２ｎ）に設けられた低剛性部の数を、異ならせる。このようにすれば、アウターロータ６の２つの共振周波数を、確実に異ならせることができる。   In other words, the position of an arbitrary low-rigidity part in the low-rigidity part 612b is defined as a point A (1), and the position at a 45 ° pitch along the rotating electric machine rotation direction with the point A1 as a base point is defined as a point A (2) to a point A. When (8), the number of low-rigidity parts provided at point A (2n-1) (where n = 1, 2, 3, 4) and the low-rigidity part provided at point A (2n) The number of different. In this way, the two resonance frequencies of the outer rotor 6 can be reliably varied.

なお、本実施形態では、半円状の切欠部６１２ａを設けたが、切欠部６１２ａは、三角形状（すなわち、楔状）や四角形状でもよい。   In this embodiment, the semicircular cutout 612a is provided, but the cutout 612a may be triangular (that is, wedge-shaped) or quadrangular.

また、本実施形態では、切欠部６１２ａを形成して低剛性部６１２ｂを設けたが、切欠部６１２ａの代わりに、ヨーク円筒部６１２から径方向に突出する突起部を形成してもよい。この場合、ヨーク円筒部６１２における突起部が形成された部位の剛性は、突起部が形成されていない部位の剛性よりも高くなる。そして、突起部が形成された高剛性部は、本発明の異剛性部に相当する。   In the present embodiment, the notched portion 612a is formed and the low-rigidity portion 612b is provided. However, instead of the notched portion 612a, a protruding portion protruding in the radial direction from the yoke cylindrical portion 612 may be formed. In this case, the rigidity of the portion where the protrusion is formed in the yoke cylindrical portion 612 is higher than the rigidity of the portion where the protrusion is not formed. And the highly rigid part in which the projection part was formed is equivalent to the different rigid part of this invention.

（第２実施形態）
本発明の第２実施形態について説明する。以下、第１実施形態と異なる部分についてのみ説明する。 (Second Embodiment)
A second embodiment of the present invention will be described. Only the parts different from the first embodiment will be described below.

本実施形態の回転電機はアウターロータ式電動機であり、図６は、アウターロータ式電動機におけるステータ７を、回転軸方向に沿って見たときの図である。   The rotating electrical machine of the present embodiment is an outer rotor type electric motor, and FIG. 6 is a view of the stator 7 in the outer rotor type electric motor when viewed along the rotation axis direction.

図６に示すように、ステータ７は、コイル７２が巻装された１２個の鉄心７１を備えている。鉄心７１は、回転電機回転方向に沿って３０°間隔の等ピッチで配置されている。   As shown in FIG. 6, the stator 7 includes twelve iron cores 71 around which coils 72 are wound. The iron cores 71 are arranged at an equal pitch of 30 ° intervals along the rotating electric machine rotation direction.

そして、１２個の鉄心７１のうち４個の鉄心７１には、その外周部に半円状の切欠部７１１が形成されている。この切欠部７１１が形成された鉄心７１の剛性は、切欠部７１１が形成されていない鉄心７１の剛性よりも低くなっている。   Of the twelve iron cores 71, four iron cores 71 are formed with semicircular cutouts 711 on the outer periphery thereof. The rigidity of the iron core 71 in which the notch 711 is formed is lower than the rigidity of the iron core 71 in which the notch 711 is not formed.

以下、切欠部７１１が形成された鉄心を低剛性鉄心７１ａという。この低剛性鉄心７１ａは、回転電機回転方向に沿って等ピッチに４個配置されている。なお、低剛性鉄心７１ａは、本発明の異剛性部に相当する。   Hereinafter, the iron core in which the notch 711 is formed is referred to as a low-rigidity iron core 71a. The four low-rigidity iron cores 71a are arranged at an equal pitch along the rotating electric machine rotation direction. The low-rigidity iron core 71a corresponds to the different rigidity portion of the present invention.

本実施形態のように、低剛性鉄心７１ａを回転電機回転方向に沿って等ピッチに４個配置した場合、ステータ７の共振モードは、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向に４５°ずれた２つの円環２次モードとなり、その円環２次モードは２つの共振周波数において現れる。したがって、ステータ７の共振による騒音が低減される。   When four low-rigidity iron cores 71a are arranged at an equal pitch along the rotation direction of the rotating electrical machine as in this embodiment, the resonance mode of the stator 7 is such that the positions of the antinodes and nodes are fixed and the antinode and node positions are mutually fixed. Becomes two circular secondary modes shifted by 45 ° in the rotating electric machine rotation direction, and the circular secondary modes appear at two resonance frequencies. Therefore, noise due to the resonance of the stator 7 is reduced.

（第３実施形態）
本発明の第３実施形態について説明する。以下、第１実施形態と異なる部分についてのみ説明する。 (Third embodiment)
A third embodiment of the present invention will be described. Only the parts different from the first embodiment will be described below.

本実施形態の回転電機はアウターロータ式電動機であり、図７は、アウターロータ式電動機におけるアウターロータ６のヨーク６１を、回転軸方向に沿って見たときの図である。   The rotating electrical machine of the present embodiment is an outer rotor type electric motor, and FIG. 7 is a view when the yoke 61 of the outer rotor 6 in the outer rotor type electric motor is viewed along the rotation axis direction.

図７に示すように、ヨーク円筒部６１２は、ヨーク板部６１１と同密度の材料よりなる円弧状の第１ヨーク円弧部６１２ｃと、ヨーク板部６１１および第１ヨーク円弧部６１２ｃとは密度の異なる材料よりなる円弧状の第２ヨーク円弧部６１２ｄとを備えている。   As shown in FIG. 7, the yoke cylindrical portion 612 has an arc-shaped first yoke arc portion 612c made of a material having the same density as the yoke plate portion 611, and the yoke plate portion 611 and the first yoke arc portion 612c have a density. And an arcuate second yoke arc portion 612d made of different materials.

そして、第１ヨーク円弧部６１２ｃと第２ヨーク円弧部６１２ｄを、回転電機回転方向に沿って交互に９０°間隔の等ピッチでそれぞれ４個配置することにより、円筒状のヨーク円筒部６１２を形成している。なお、図７では、第２ヨーク円弧部６１２ｄの範囲を明瞭にするために、便宜的に第２ヨーク円弧部６１２ｄの部位を綾目模様で示している。   A cylindrical yoke cylindrical portion 612 is formed by arranging four first yoke arc portions 612c and second yoke arc portions 612d alternately at equal intervals of 90 ° along the rotating electric machine rotation direction. doing. In FIG. 7, for the sake of clarity, the portion of the second yoke arc portion 612d is shown in a cross pattern for the sake of clarity.

ここで、ヨーク円筒部６１２における回転電機回転方向の所定範囲毎の重量を所定範囲重量とした場合、第２ヨーク円弧部６１２ｄを含む部位の所定範囲重量と、第２ヨーク円弧部６１２ｄを含まない部位の所定範囲重量は、異なるものになる。なお、第２ヨーク円弧部６１２ｄを含む部位は、本発明の異重量部に相当する。   Here, when the weight for each predetermined range in the rotating electric machine rotation direction in the yoke cylindrical portion 612 is defined as the predetermined range weight, the predetermined range weight of the portion including the second yoke arc portion 612d and the second yoke arc portion 612d are not included. The predetermined range weight of the site will be different. The portion including the second yoke arc portion 612d corresponds to the different weight portion of the present invention.

本実施形態のように、第２ヨーク円弧部６１２ｄを回転電機回転方向に沿って等ピッチに４個配置した場合、アウターロータ６の共振モードは、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向に４５°ずれた２つの円環２次モードとなり、その円環２次モードは２つの共振周波数において現れる。したがって、アウターロータ６の共振による騒音が低減される。   When the four second yoke arcs 612d are arranged at an equal pitch along the rotating electric machine rotation direction as in this embodiment, the resonance mode of the outer rotor 6 is such that the positions of the antinodes and nodes are fixed and the antinodes are mutually antinodes. The two circular secondary modes in which the position of the node is shifted by 45 ° in the rotating electric machine rotation direction appear, and the circular secondary modes appear at two resonance frequencies. Therefore, noise due to resonance of the outer rotor 6 is reduced.

（第４実施形態）
本発明の第３実施形態について説明する。以下、第１実施形態と異なる部分についてのみ説明する。 (Fourth embodiment)
A third embodiment of the present invention will be described. Only the parts different from the first embodiment will be described below.

本実施形態の回転電機はアウターロータ式電動機であり、図８は、アウターロータ式電動機におけるアウターロータ６のヨーク６１を、回転軸方向に沿って見たときの図である。   The rotating electrical machine of the present embodiment is an outer rotor type electric motor, and FIG. 8 is a view when the yoke 61 of the outer rotor 6 in the outer rotor type electric motor is viewed along the direction of the rotation axis.

図８に示すように、ヨーク円筒部６１２の外周側には、回転電機回転方向に沿って９０°間隔の等ピッチで、金属または樹脂よりなる薄板状の板部材６１３が４個接合されている。   As shown in FIG. 8, four thin plate members 613 made of metal or resin are joined to the outer peripheral side of the yoke cylindrical portion 612 at an equal pitch of 90 ° along the rotating electric machine rotation direction. .

ここで、ヨーク円筒部６１２における回転電機回転方向の所定範囲毎の重量を所定範囲重量とした場合、板部材６１３を含む部位の所定範囲重量と、板部材６１３を含まない部位の所定範囲重量は、異なるものになる。なお、板部材６１３を含む部位は、本発明の異重量部に相当する。   Here, when the weight for each predetermined range in the rotating electrical machine rotation direction in the yoke cylindrical portion 612 is defined as the predetermined range weight, the predetermined range weight of the portion including the plate member 613 and the predetermined range weight of the portion not including the plate member 613 are To be different. The portion including the plate member 613 corresponds to the different weight portion of the present invention.

また、ヨーク円筒部６１２における板部材６１３が接合された部位の剛性は、板部材６１３が接合されていない部位の剛性よりも高くなる。したがって、ヨーク円筒部６１２における板部材６１３が接合された部位は、本発明の異剛性部に相当する。   Further, the rigidity of the portion where the plate member 613 is joined in the yoke cylindrical portion 612 is higher than the rigidity of the portion where the plate member 613 is not joined. Accordingly, the portion of the yoke cylindrical portion 612 where the plate member 613 is joined corresponds to the different rigidity portion of the present invention.

本実施形態のように、板部材６１３を回転電機回転方向に沿って等ピッチに４個配置した場合、アウターロータ６の共振モードは、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向に４５°ずれた２つの円環２次モードとなり、その円環２次モードは２つの共振周波数において現れる。したがって、アウターロータ６の共振による騒音が低減される。   When four plate members 613 are arranged at an equal pitch along the rotating electric machine rotation direction as in the present embodiment, the resonance mode of the outer rotor 6 is such that the positions of the antinodes and nodes are fixed and the positions of the antinodes and nodes are mutually fixed. Becomes two circular secondary modes shifted by 45 ° in the rotating electric machine rotation direction, and the circular secondary modes appear at two resonance frequencies. Therefore, noise due to resonance of the outer rotor 6 is reduced.

（第５実施形態）
本発明の第３実施形態について説明する。以下、第１実施形態と異なる部分についてのみ説明する。 (Fifth embodiment)
A third embodiment of the present invention will be described. Only the parts different from the first embodiment will be described below.

本実施形態の回転電機はアウターロータ式電動機であり、図９（ａ）は、アウターロータ式電動機におけるアウターロータ６のヨーク６１の正面断面図、図９（ｂ）は、図９（ａ）のＢ矢視図である。   The rotating electrical machine of this embodiment is an outer rotor type electric motor. FIG. 9A is a front sectional view of the yoke 61 of the outer rotor 6 in the outer rotor type electric motor, and FIG. FIG.

本実施形態のヨーク６１は、以下のようにして形成される。まず、図１０（ａ）に示すように、材質が異なる直方体状の２種類の金属素材Ｘ、Ｙを用意する。第１金属素材Ｘと第２金属素材Ｙは、いずれも等方性材料であるが、強度や弾性係数等が異なっている。続いて、図１０（ｂ）に示すように、第１金属素材Ｘと第２金属素材Ｙを交互に積層して接合した後、図１０（ｃ）に示すように、円盤状に打ち出す。そして、円盤状の素材を絞り加工して、図９に示すような有底円筒状のヨーク６１を形成する。なお、図９、図１０では、第１金属素材Ｘと第２金属素材Ｙを明瞭に区別するために、便宜的に第２金属素材Ｙを綾目模様で示している。   The yoke 61 of this embodiment is formed as follows. First, as shown in FIG. 10A, two kinds of rectangular parallelepiped metal materials X and Y having different materials are prepared. The first metal material X and the second metal material Y are both isotropic materials, but are different in strength, elastic modulus, and the like. Subsequently, as shown in FIG. 10B, the first metal material X and the second metal material Y are alternately stacked and joined, and then punched out into a disk shape as shown in FIG. 10C. Then, the disk-shaped material is drawn to form a bottomed cylindrical yoke 61 as shown in FIG. In FIGS. 9 and 10, the second metal material Y is shown in a cross pattern for the sake of convenience in order to clearly distinguish the first metal material X and the second metal material Y.

このようにして形成されたヨーク６１は、ヨーク６１に対してその径方向に力を作用させた場合、力を作用させる位置によって剛性が異なる。したがって、アウターロータ６の共振モードは、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向にずれた２つの円環２次モードとなり、その円環２次モードは２つの共振周波数において現れる。したがって、アウターロータ６の共振による騒音が低減される。   The yoke 61 thus formed has different rigidity depending on the position where the force is applied when a force is applied to the yoke 61 in the radial direction. Accordingly, the resonance mode of the outer rotor 6 is two circular secondary modes in which the positions of the antinodes and nodes are fixed and the antinodes and nodes are displaced from each other in the rotating electric machine rotation direction. Appears at two resonant frequencies. Therefore, noise due to resonance of the outer rotor 6 is reduced.

（第６実施形態）
本発明の第６実施形態について説明する。以下、第１実施形態と異なる部分についてのみ説明する。 (Sixth embodiment)
A sixth embodiment of the present invention will be described. Only the parts different from the first embodiment will be described below.

図１１、図１２に示すように、本実施形態の回転電機は、インナーロータ式電動機であり、回転軸５に永久磁石のインナーロータ９が圧入固定され、鉄心８１にコイル８２を巻装した円筒状のステータ８がインナーロータ９を囲むようにして配置されている。   As shown in FIGS. 11 and 12, the rotating electrical machine according to the present embodiment is an inner rotor type electric motor, and a permanent magnet inner rotor 9 is press-fitted and fixed to a rotating shaft 5 and a coil 82 is wound around an iron core 81. A stator 8 is arranged so as to surround the inner rotor 9.

鉄心８１の内周側には、回転電機回転方向に沿って複数のスロット８１１が形成されている。また、鉄心８１の外周側には、回転電機回転方向に沿って９０°間隔の等ピッチで、半円状の切欠部８１２が４個形成されている。そして、鉄心８１における切欠部８１２が形成された部位の剛性は、切欠部８１２が形成されていない部位の剛性よりも低くなっている。   A plurality of slots 811 are formed on the inner peripheral side of the iron core 81 along the rotating electric machine rotation direction. Further, four semicircular cutouts 812 are formed on the outer peripheral side of the iron core 81 at an equal pitch of 90 ° along the rotating electric machine rotation direction. And the rigidity of the site | part in which the notch part 812 was formed in the iron core 81 is lower than the rigidity of the site | part in which the notch part 812 is not formed.

以下、鉄心８１における切欠部８１２が形成された部位を、低剛性部８１３という。この低剛性部８１３は、回転電機回転方向に沿って等ピッチに４個配置されている。なお、低剛性部８１３は、本発明の異剛性部に相当する。   Hereinafter, the portion of the iron core 81 where the notch 812 is formed is referred to as a low rigidity portion 813. Four low rigidity portions 813 are arranged at an equal pitch along the rotating electric machine rotation direction. The low rigidity portion 813 corresponds to the different rigidity portion of the present invention.

このように構成されたインナーロータ式電動機は、コイル８２に電力が供給されるとステータ８が電磁力を発生し、その電磁力を受けて回転軸５およびインナーロータ９が回転する。   In the inner rotor type electric motor configured as described above, when electric power is supplied to the coil 82, the stator 8 generates an electromagnetic force, and the rotating shaft 5 and the inner rotor 9 rotate by receiving the electromagnetic force.

本実施形態のように、低剛性部８１３を回転電機回転方向に沿って等ピッチに４個配置した場合、ステータ８の共振モードは、腹と節の位置が固定され且つ互いに腹と節の位置が回転電機回転方向に４５°ずれた２つの円環２次モードとなり、その円環２次モードは２つの共振周波数において現れる。したがって、ステータ８の共振による騒音が低減される。   When four low-rigidity parts 813 are arranged at an equal pitch along the rotation direction of the rotating electrical machine as in the present embodiment, the resonance mode of the stator 8 is such that the positions of the antinodes and nodes are fixed and the antinode and node positions are mutually fixed. Becomes two circular secondary modes shifted by 45 ° in the rotating electric machine rotation direction, and the circular secondary modes appear at two resonance frequencies. Therefore, noise due to resonance of the stator 8 is reduced.

（他の実施形態）
なお、共振による騒音の低減効果の観点からは、円環２次の共振モードの場合、異剛性部または異重量部を２個または４個設けることが望ましく、円環３次の共振モードの場合、異剛性部または異重量部を３個または６個設けることが望ましい。換言すると、円環ｍ次の共振モードに対し、異剛性部または異重量部をｍ個または２ｍ個設けることが望ましい。
また、異剛性部または異重量部は回転電機回転方向に沿って等ピッチに配置することで最大の騒音低減効果が得られるが、ロータのヨーク円筒部６１２またはステータの鉄心７１、８１を、回転電機回転方向に沿って等ピッチに２ｍ個の領域に仮想的に分割し、分割された各仮想領域の適宜位置にそれぞれ一箇所ずつ異剛性部または異重量部を設けても、換言すると、異剛性部または異重量部を回転電機回転方向に沿って不等ピッチに配置しても、騒音低減効果が得られる。
また、磁極数が１０で且つスロット数が１２の回転電機は、円環２次の共振モードを誘発しやすいため、本発明は、磁極数が１０で且つスロット数が１２の回転電機に好適である。 (Other embodiments)
From the viewpoint of the noise reduction effect due to resonance, it is desirable to provide two or four different rigidity parts or different weight parts in the case of the circular secondary resonance mode, and in the case of the circular third resonance mode. It is desirable to provide three or six different rigidity parts or different weight parts. In other words, it is desirable to provide m or 2m different rigid parts or different weight parts for the m-th order resonance mode of the ring.
In addition, although the different rigidity portion or the different weight portion can be arranged at an equal pitch along the rotating electric machine rotation direction, the maximum noise reduction effect can be obtained. However, the rotor cylindrical portion 612 or the stator iron cores 71 and 81 are rotated. It is possible to virtually divide into 2 m areas at equal pitches along the electric machine rotation direction, and provide different rigid parts or different weight parts at appropriate positions in the divided virtual areas. Even if the rigid portions or the different weight portions are arranged at unequal pitches along the rotating electric machine rotation direction, a noise reduction effect can be obtained.
In addition, since a rotating electrical machine having 10 magnetic poles and 12 slots is likely to induce a secondary secondary resonance mode, the present invention is suitable for a rotating electrical machine having 10 magnetic poles and 12 slots. is there.

また、上記各実施形態では、アウターロータ式電動機またはインナーロータ式電動機を示したが、本発明は、アウターロータ式発電機、インナーロータ式回転電機、ロータにコイルが巻装されステータに永久磁石が固定された形式の回転電機にも適用することができる。   In each of the above embodiments, an outer rotor type electric motor or an inner rotor type electric motor is shown. However, the present invention provides an outer rotor type electric generator, an inner rotor type electric rotating machine, a coil wound around a rotor, and a stator having a permanent magnet. The present invention can also be applied to a fixed type rotating electric machine.

なお、本発明は上記した実施形態に限定されるものではなく、特許請求の範囲に記載した範囲内において適宜変更が可能である。   In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably.

また、上記各実施形態は、互いに無関係なものではなく、組み合わせが明らかに不可な場合を除き、適宜組み合わせが可能である。   Further, the above embodiments are not irrelevant to each other, and can be combined as appropriate unless the combination is clearly impossible.

また、上記各実施形態において、実施形態を構成する要素は、特に必須であると明示した場合および原理的に明らかに必須であると考えられる場合等を除き、必ずしも必須のものではないことは言うまでもない。   In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Yes.

また、上記各実施形態において、実施形態の構成要素の個数、数値、量、範囲等の数値が言及されている場合、特に必須であると明示した場合および原理的に明らかに特定の数に限定される場合等を除き、その特定の数に限定されるものではない。   Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case.

また、上記各実施形態において、構成要素等の形状、位置関係等に言及するときは、特に明示した場合および原理的に特定の形状、位置関係等に限定される場合等を除き、その形状、位置関係等に限定されるものではない。   Further, in each of the above embodiments, when referring to the shape, positional relationship, etc. of the component, etc., the shape, unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to the positional relationship or the like.

６ アウターロータ
７ ステータ
８ ステータ
９ インナーロータ
６１ ヨーク
６２ 永久磁石
７１ 鉄心
７２ コイル
６１２ ヨーク円筒部
７１ａ 低剛性鉄心（異剛性部）
８１３ 低剛性部（異剛性部）
６１２ｂ 低剛性部（異剛性部） 6 Outer rotor 7 Stator 8 Stator 9 Inner rotor
61 Yoke 62 Permanent magnet 71 Iron core 72 Coil 612 Yoke cylindrical part 71a Low rigidity iron core (different rigidity part)
813 Low rigidity part (different rigidity part)
612b Low rigidity part (different rigidity part)

Claims (9)

ロータ（６、９）のヨーク円筒部（６１２）またはステータ（７、８）の鉄心（７１、８１）における回転電機回転方向の所定範囲毎の重量を所定範囲重量としたとき、
前記ロータ（６、９）のヨーク円筒部または前記ステータの鉄心における回転電機回転方向の少なくとも一箇所に、残部とは前記所定範囲重量が異なる異重量部（６１２ｄ、６１３）、または残部とは剛性が異なる異剛性部（７１ａ、６１２ｂ、８１３）を備えることを特徴とする回転電機。 When the weight of each predetermined range in the rotating electric machine rotation direction in the yoke cylindrical portion (612) of the rotor (6, 9) or the iron core (71, 81) of the stator (7, 8) is set as the predetermined range weight,
The at least one portion of the rotor (6, 9) in the yoke cylindrical portion or the stator iron core in the rotating electric machine rotating direction has a different weight portion (612d, 613) having a predetermined range weight different from the remaining portion, or the remaining portion is rigid. A rotating electrical machine comprising different rigid portions (71a, 612b, 813) different from each other. 円環ｍ次の共振モードに対し、前記異剛性部または前記異重量部をｍ個または２ｍ個備えることを特徴とする請求項１に記載の回転電機。   2. The rotating electrical machine according to claim 1, wherein m or 2 m of the different rigidity portions or the different weight portions are provided for an annular m-order resonance mode. 前記ロータのヨーク円筒部または前記ステータの鉄心を回転電機回転方向に沿って等ピッチに２ｍ個の領域に仮想的に分割し、分割された各仮想領域の適宜位置にそれぞれ一箇所ずつ前記異剛性部または前記異重量部を備えることを特徴とする請求項２に記載の回転電機。   The rotor cylindrical portion of the rotor or the iron core of the stator is virtually divided into 2 m regions at an equal pitch along the rotating electric machine rotation direction, and the different stiffnesses are respectively provided at appropriate positions in the divided virtual regions. The rotating electrical machine according to claim 2, further comprising a portion or the different weight portion. 前記異剛性部または前記異重量部を複数備え、
複数の前記異剛性部または前記異重量部のうち任意の異剛性部または異重量部に対し、他の異剛性部または他の異重量部のうちの１つが、回転電機回転方向に沿って１８０°ずれた位置に配置されていることを特徴とする請求項１ないし３のいずれか１つに記載の回転電機。 A plurality of the different rigidity portions or the different weight portions,
One of the other different rigid portions or the other different weight portions is 180 along the rotation direction of the rotating electrical machine with respect to an arbitrary different rigid portion or different weight portion among the plurality of different rigid portions or the different weight portions. The rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine is disposed at a position deviated from the angle. 前記異剛性部または前記異重量部を複数備え、
複数の前記異剛性部または前記異重量部は、回転電機回転方向に沿って等ピッチに配置されていることを特徴とする請求項１ないし４のいずれか１つに記載の回転電機。 A plurality of the different rigidity portions or the different weight portions,
5. The rotating electrical machine according to claim 1, wherein the plurality of different rigid portions or the different weight portions are arranged at an equal pitch along a rotating electric machine rotation direction. 前記異剛性部または前記異重量部を複数備え、
複数の前記異剛性部または前記異重量部のうち任意の異剛性部または異重量部の位置を点Ａ（１）とし、前記点Ａ（１）を基点として回転電機回転方向に沿って４５°ピッチの位置を点Ａ（２）〜点Ａ（８）としたとき、
点Ａ（２ｎ−１）（ただし、ｎ＝１、２、３、４）に設けられた異剛性部または異重量部の数と点Ａ（２ｎ）に設けられた異剛性部または異重量部の数が異なることを特徴とする請求項１または２に記載の回転電機。 A plurality of the different rigidity portions or the different weight portions,
The position of any different rigid portion or different weight portion among the plurality of different rigid portions or the different weight portions is defined as a point A (1), and 45 ° along the rotating electric machine rotation direction with the point A (1) as a base point. When the position of the pitch is point A (2) to point A (8),
Number of different rigid parts or different weight parts provided at point A (2n-1) (where n = 1, 2, 3, 4) and different rigid parts or different weight parts provided at point A (2n) The rotating electric machine according to claim 1, wherein the number of the rotating machines is different. 前記異剛性部または前記異重量部は、回転電機回転方向に沿って等ピッチに４個配置されていることを特徴とする請求項１ないし５のいずれか１つに記載の回転電機。   6. The rotating electrical machine according to claim 1, wherein four different rigid portions or different weight portions are arranged at an equal pitch along a rotating electric machine rotation direction. 前記ロータは、ヨーク（６１）におけるヨーク円筒部（６１２）の内周側に永久磁石（６２）が固定されており、
前記ステータは、前記ロータの内側に配置され、鉄心（７１）にコイル（７２）が巻装されており、
前記異剛性部または前記異重量部は、前記ロータに設けられていることを特徴とする請求項１ないし７のいずれか１つに記載の回転電機。 The rotor has a permanent magnet (62) fixed to the inner peripheral side of the yoke cylindrical portion (612) of the yoke (61),
The stator is arranged inside the rotor, and a coil (72) is wound around an iron core (71),
The rotating electrical machine according to claim 1, wherein the different rigidity portion or the different weight portion is provided in the rotor. 前記ロータまたは前記ステータの磁極数が１０であり、前記ロータまたは前記ステータのスロット数が１２であることを特徴とする請求項１ないし８のいずれか１つに記載の回転電機。   9. The rotating electrical machine according to claim 1, wherein the number of magnetic poles of the rotor or the stator is 10, and the number of slots of the rotor or the stator is 12.
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JPH09182329A (en) * 1995-12-22 1997-07-11 Hitachi Metals Ltd Magnet rotor for rotating machine
JPH11243655A (en) * 1998-02-24 1999-09-07 Calsonic Corp Rotor part of brushless motor
JP2001069704A (en) * 1999-08-31 2001-03-16 Seiko Instruments Inc Method of adjusting balance of electric motor and its rotor
JP2001268824A (en) * 2000-03-17 2001-09-28 Matsushita Electric Ind Co Ltd Compressor
JP2009161045A (en) * 2008-01-07 2009-07-23 Toyota Auto Body Co Ltd In-wheel motor
JP2011015536A (en) * 2009-07-02 2011-01-20 Honda Motor Co Ltd Motor unit
JP2011199919A (en) * 2010-03-17 2011-10-06 Nissan Motor Co Ltd Stator of electric motor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08266026A (en) * 1995-03-20 1996-10-11 Railway Technical Res Inst Driving device for railway rolling stock and method of assembling driving device for railway rolling stock
JPH09182329A (en) * 1995-12-22 1997-07-11 Hitachi Metals Ltd Magnet rotor for rotating machine
JPH11243655A (en) * 1998-02-24 1999-09-07 Calsonic Corp Rotor part of brushless motor
JP2001069704A (en) * 1999-08-31 2001-03-16 Seiko Instruments Inc Method of adjusting balance of electric motor and its rotor
JP2001268824A (en) * 2000-03-17 2001-09-28 Matsushita Electric Ind Co Ltd Compressor
JP2009161045A (en) * 2008-01-07 2009-07-23 Toyota Auto Body Co Ltd In-wheel motor
JP2011015536A (en) * 2009-07-02 2011-01-20 Honda Motor Co Ltd Motor unit
JP2011199919A (en) * 2010-03-17 2011-10-06 Nissan Motor Co Ltd Stator of electric motor

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