JP2014075908A - Electric motor, air conditioner mounting the same, and manufacturing method of the same - Google Patents

Electric motor, air conditioner mounting the same, and manufacturing method of the same Download PDF

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JP2014075908A
JP2014075908A JP2012222195A JP2012222195A JP2014075908A JP 2014075908 A JP2014075908 A JP 2014075908A JP 2012222195 A JP2012222195 A JP 2012222195A JP 2012222195 A JP2012222195 A JP 2012222195A JP 2014075908 A JP2014075908 A JP 2014075908A
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bearing
electric motor
disk
stator
outer ring
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JP5490200B2 (en
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Junichiro Oya
隼一郎 尾屋
Kazunori Sakanobe
和憲 坂廼邊
Mineo Yamamoto
峰雄 山本
Hiroyuki Ishii
博幸 石井
Hiroki Aso
洋樹 麻生
Yuto Urabe
優人 浦辺
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an electric motor which can suppress electric corrosion of a bearing even for a long time use, an air conditioner mounting the same, and a manufacturing method of the same.SOLUTION: The electric motor comprises: a bearing outer ring 15a-1(15b-1), a bearing inner ring 15a-3(15b-3), a plurality of bearing rolling elements 15a-2(15b-2), and a bearing seal plate 15a-4(15b-4) which is electrically connected with the bearing outer ring 15a-1(15b-1). The electric motor comprises: a first bearing 15a and a second bearing 15b which rotatably support a rotation shaft 10; and a first disc-like conductor 16a and a second disc-like conductor 16b which are electrically connected with the rotation shaft 10, which are arranged in non-contact state and adjacent to the bearing outer ring 15a-1(15b-1) and the bearing seal plate 15a-4(15b-4), and which form electrostatic capacitance between the bearing seal plate 15a-4(15b-4) and the first disk-like conductor 16a/the second disk-like conductor 16b, or between a group of the bearing seal plate 15a-4(15b-4) and the bearing outer ring 15a-1(15b-1) and the first disk-like conductor 16a/the second disk-like conductor 16b.

Description

本発明は、電動機、この電動機を搭載した空気調和機、およびこの電動機の製造方法に関する。   The present invention relates to an electric motor, an air conditioner equipped with the electric motor, and a method for manufacturing the electric motor.

近年、電動機は、パルス幅変調(Pulse Width Modulation)方式(以下、「PWM方式」という)のインバータにより駆動する方式を採用するケースが多くなってきている。こうしたPWM方式のインバータ駆動の電動機では、巻線の中性点電位が零とならないため、軸受の外輪と内輪との間に電位差(以下、「軸電圧」という)が発生する。この軸電圧にはインバータのスイッチングによる高周波成分が含まれており、軸電圧が軸受内部の油膜の絶縁破壊電圧に達すると、軸受内部に電流(以下、「軸電流」という)が流れ軸受内部に電食が発生する。電食が進行した場合、軸受内輪、軸受外輪、あるいは軸受転動体に波状摩耗現象が発生し、この摩耗現象に起因した異常音が電動機における不具合の1つとなっている。   In recent years, electric motors are increasingly adopting a system driven by an inverter of a pulse width modulation system (hereinafter referred to as “PWM system”). In such a PWM inverter-driven electric motor, the neutral point potential of the winding does not become zero, so that a potential difference (hereinafter referred to as “shaft voltage”) occurs between the outer ring and the inner ring of the bearing. This shaft voltage contains high-frequency components due to switching of the inverter. When the shaft voltage reaches the breakdown voltage of the oil film inside the bearing, a current (hereinafter referred to as “shaft current”) flows inside the bearing. Electric corrosion occurs. When electrolytic corrosion progresses, a wave-like wear phenomenon occurs in the bearing inner ring, the bearing outer ring, or the bearing rolling element, and abnormal noise resulting from this wear phenomenon is one of the problems in the motor.

従来、軸受内輪と外輪を電気的に接続することにより、軸受内部に流れる電流を低減して、軸受内輪、軸受外輪、あるいは軸受転動体における波状摩耗の発生を抑制し、波状摩耗現象に起因した異常音の発生を抑制する技術が開示されている(例えば、特許文献1)。   Conventionally, by electrically connecting the bearing inner ring and outer ring, the current flowing inside the bearing is reduced, and the occurrence of wave wear in the bearing inner ring, bearing outer ring, or bearing rolling element is suppressed, resulting from the wave wear phenomenon. A technique for suppressing the occurrence of abnormal noise is disclosed (for example, Patent Document 1).

特開平9−291943号公報JP-A-9-291944

しかしながら、上記従来技術では、軸受内輪と外輪を電気的に接続する際に、回転に伴って動作する可動部と非可動部とが接触する構成を利用しているため、長期使用時に、摩耗により軸受内輪と外輪とが電気的に未接続となり、軸電流抑制効果が低下するため、長期使用時において軸受内輪、軸受外輪、あるいは軸受転動体の波状磨耗やこれに起因する異常音の要因となる軸受の電食の抑制効果が低下する、という問題があった。   However, in the above prior art, when the bearing inner ring and the outer ring are electrically connected, a structure in which the movable part that moves with rotation and the non-movable part are in contact with each other is used. Since the bearing inner ring and outer ring are electrically disconnected and the shaft current suppression effect is reduced, this will cause wavy wear of the bearing inner ring, bearing outer ring, or bearing rolling element and abnormal noise due to this during long-term use. There was a problem that the effect of suppressing the electric corrosion of the bearing was lowered.

本発明は、上記に鑑みてなされたものであって、長期使用時においても、軸受の電食の抑制効果を維持することが可能な電動機、この電動機を搭載した空気調和機、およびこの電動機の製造方法を提供することを目的とする。   The present invention has been made in view of the above, and an electric motor capable of maintaining the effect of suppressing electric corrosion of a bearing even during long-term use, an air conditioner equipped with the electric motor, and an electric motor of the electric motor An object is to provide a manufacturing method.

上述した課題を解決し、目的を達成するため、本発明にかかる電動機は、環状の固定子鉄心を有する固定子と、前記固定子の内側に配置され、前記固定子鉄心と対向して回転軸の外周側に配置された永久磁石を有する回転子と、軸受外輪、軸受内輪、複数個の軸受転動体、および、前記軸受外輪と電気的に接続され、前記軸受転動体を潤滑に転動させる潤滑油を封入するための軸受シール板を備えて構成され、前記回転軸を回転自在に支持する第1の軸受および第2の軸受と、導電性部材で形成され、前記回転軸と電気的に接続されると共に、前記第1の軸受に関して、前記軸受シール板および前記軸受外輪と非接触状態で近接して配置され、前記軸受シール板との間、あるいは、前記軸受シール板および前記軸受外輪との間に静電容量を形成する第1の円盤状導体と、導電性部材で形成され、前記回転軸と電気的に接続されると共に、前記第2の軸受に関して、前記軸受シール板および前記軸受外輪と非接触状態で近接して配置され、前記軸受シール板との間、あるいは、前記軸受シール板および前記軸受外輪との間に静電容量を形成する第2の円盤状導体と、を備えることを特徴とする。   In order to solve the above-described problems and achieve the object, an electric motor according to the present invention includes a stator having an annular stator core, a rotary shaft disposed inside the stator and facing the stator core. A rotor having a permanent magnet disposed on the outer peripheral side of the bearing, a bearing outer ring, a bearing inner ring, a plurality of bearing rolling elements, and the bearing outer ring, and electrically connected to the bearing rolling element to lubricate the bearing rolling element A bearing seal plate for enclosing the lubricating oil is formed, and is formed of a first bearing and a second bearing that rotatably support the rotating shaft, and a conductive member, and is electrically connected to the rotating shaft. And connected to the bearing seal plate and the bearing outer ring in a non-contact state with respect to the first bearing, and between the bearing seal plate and the bearing seal plate and the bearing outer ring. Form the capacitance between A first disk-shaped conductor that is electrically connected to the rotary shaft, and is adjacent to the bearing seal plate and the bearing outer ring in a non-contact state with respect to the second bearing. And a second disk-shaped conductor that forms a capacitance between the bearing seal plate or between the bearing seal plate and the bearing outer ring.

本発明によれば、長期使用時においても、軸受の電食を抑制することができる、という効果を奏する。   According to the present invention, there is an effect that the electrolytic corrosion of the bearing can be suppressed even during long-term use.

図1は、実施の形態1にかかる電動機の側面断面図である。FIG. 1 is a side sectional view of the electric motor according to the first embodiment. 図2は、実施の形態1にかかる電動機の製造工程の一例を示す図である。FIG. 2 is a diagram illustrating an example of a manufacturing process of the electric motor according to the first embodiment. 図3は、実施の形態1にかかる電動機の回転子組立を模式的に示す図である。FIG. 3 is a diagram schematically illustrating the rotor assembly of the electric motor according to the first embodiment. 図4は、実施の形態1にかかる電動機の負荷側軸受、反負荷側軸受、負荷側円盤状導体、および反負荷側円盤状導体の詳細構成および組み付け位置の一例を示す図である。FIG. 4 is a diagram illustrating an example of a detailed configuration and an assembling position of the load-side bearing, the anti-load-side bearing, the load-side disc-shaped conductor, and the anti-load-side disc-shaped conductor of the electric motor according to the first embodiment. 図5は、実施の形態2にかかる電動機の負荷側軸受、反負荷側軸受、負荷側円盤状導体、および反負荷側円盤状導体の詳細構成および組み付け位置の一例を示す図である。FIG. 5 is a diagram illustrating an example of a detailed configuration and an assembling position of the load side bearing, the anti-load side bearing, the load side disk-shaped conductor, and the anti-load side disk-shaped conductor of the electric motor according to the second embodiment. 図6は、実施の形態3にかかる空気調和機の構成図である。FIG. 6 is a configuration diagram of an air conditioner according to the third embodiment.

以下に添付図面を参照し、本発明の電動機、この電動機を搭載した空気調和機、およびこの電動機の製造方法の実施の形態を図面に基づいて詳細に説明する。なお、以下に示す実施の形態により本発明が限定されるものではない。   Embodiments of an electric motor of the present invention, an air conditioner equipped with the electric motor, and a method for manufacturing the electric motor will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

実施の形態1.
図1は、実施の形態1にかかる電動機の側面断面図である。また、図2は、実施の形態1にかかる電動機の製造工程の一例を示す図である。また、図3は、実施の形態1にかかる電動機の回転子組立を模式的に示す図である。
Embodiment 1 FIG.
FIG. 1 is a side sectional view of the electric motor according to the first embodiment. FIG. 2 is a diagram illustrating an example of a manufacturing process of the electric motor according to the first embodiment. FIG. 3 is a diagram schematically illustrating the rotor assembly of the electric motor according to the first embodiment.

図1に示される電動機100は、例えばインバータで駆動されるブラシレスDCモータであり、主たる構成要素として、固定子6と、駆動回路基板4と、回転子14と、負荷側軸受15a(第1の軸受)と、反負荷側軸受15b(第2の軸受)と、負荷側円盤状導体16a(第1の円盤状導体)と、反負荷側円盤状導体16b(第2の円盤状導体)と、モールド樹脂2と、導電性ブラケット20とを有して構成されている。なお、図1では、電動機100の構成のうち回転軸10を中心として左側半分のみの断面図を示しているが、右側半分についても同様である。   An electric motor 100 shown in FIG. 1 is, for example, a brushless DC motor driven by an inverter. As main components, a stator 6, a drive circuit board 4, a rotor 14, and a load-side bearing 15a (first bearing) Bearing), anti-load-side bearing 15b (second bearing), load-side disk-shaped conductor 16a (first disk-shaped conductor), anti-load-side disk-shaped conductor 16b (second disk-shaped conductor), The mold resin 2 and the conductive bracket 20 are included. 1 shows a cross-sectional view of only the left half of the configuration of the electric motor 100 with the rotary shaft 10 as the center, but the same applies to the right half.

本実施の形態にかかる電動機100の製造方法としては、まず、固定子6および駆動回路基板4が製造される(図2のステップST101、ステップST102)。   As a method of manufacturing the electric motor 100 according to the present embodiment, first, the stator 6 and the drive circuit board 4 are manufactured (step ST101 and step ST102 in FIG. 2).

固定子6は、巻線7、固定子鉄心8、およびインシュレータ9で構成される。固定子鉄心8は、厚さが例えば0.1〜0.7mm程度の電磁鋼板が帯状に打ち抜かれ、かしめ、溶接、および接着等で積層されて製作される。固定子鉄心8は、環状で、内周側に複数個のティース(図示せず)を備え、ティースにはインシュレータ9が施される。インシュレータ9は、例えば、PBT(ポリブチレンテレフタレート)等の熱可塑性樹脂を用いて、固定子鉄心8と一体にまたは別体で成形される。インシュレータ9が施されたティースには集中巻の巻線7が巻回される。複数個の集中巻の巻線7を接続して、例えば、三相のシングルY結線の巻線が形成される。なお、巻線7の巻回は、集中巻に限るものではなく、例えば分布巻であってもよい。   The stator 6 includes a winding 7, a stator core 8, and an insulator 9. The stator core 8 is manufactured by punching a magnetic steel sheet having a thickness of, for example, about 0.1 to 0.7 mm into a strip shape, and laminating by caulking, welding, adhesion, or the like. The stator core 8 is annular and includes a plurality of teeth (not shown) on the inner peripheral side, and an insulator 9 is applied to the teeth. The insulator 9 is formed integrally or separately with the stator core 8 using a thermoplastic resin such as PBT (polybutylene terephthalate). Concentrated windings 7 are wound around the teeth to which the insulator 9 is applied. A plurality of concentrated windings 7 are connected to form, for example, a three-phase single Y-connection winding. Note that the winding of the winding 7 is not limited to concentrated winding, and may be distributed winding, for example.

駆動回路基板4の中心には、後述する回転子組立15(回転軸10)を挿通するための穴が設けられている。駆動回路基板4には電動機100を駆動するための駆動回路(図示せず)が実装される。この駆動回路は、インバータ回路などを含んで構成される。インバータ回路は、回転子14を回転駆動するための交流電力を直流電源から変換生成する。インバータ回路からの電圧は、駆動回路基板4と巻線7とを電気的に接続する端子(図示せず)を介して巻線7に印加される。なお、駆動回路基板4には、インバータ回路の他にも、例えば、位置検出用磁石11が発生する磁束密度変化によって回転子14の回転速度もしくは回転位置を検出するホール素子や、駆動回路基板4と電動機100の外部の回路(図示せず)とを電気的に接続する接続リードなどが実装されているが、図1ではこれらの図示を省略している。   In the center of the drive circuit board 4, a hole for inserting a rotor assembly 15 (rotary shaft 10) described later is provided. A drive circuit (not shown) for driving the electric motor 100 is mounted on the drive circuit board 4. This drive circuit includes an inverter circuit and the like. The inverter circuit converts AC power for rotationally driving the rotor 14 from a DC power source. The voltage from the inverter circuit is applied to the winding 7 via a terminal (not shown) that electrically connects the drive circuit board 4 and the winding 7. In addition to the inverter circuit, the drive circuit board 4 includes, for example, a Hall element that detects the rotation speed or the rotation position of the rotor 14 based on a change in magnetic flux density generated by the position detection magnet 11, and the drive circuit board 4. A connection lead or the like for electrically connecting the motor and a circuit (not shown) outside the motor 100 is mounted, but these are not shown in FIG.

つぎに、固定子6に駆動回路基板4を組み付けられることにより、固定子組立3が製造される(図2のステップST103)。   Next, the stator assembly 3 is manufactured by assembling the drive circuit board 4 to the stator 6 (step ST103 in FIG. 2).

駆動回路基板4は、固定子6の軸方向端部に、軸方向に対して略垂直に配設され、巻線7と半田にて接続される。   The drive circuit board 4 is disposed substantially perpendicular to the axial direction at the axial end of the stator 6 and is connected to the winding 7 by soldering.

つぎに、固定子組立3がモールド樹脂2により一体成形され、モールド固定子1が製造される(図2のステップST104)。   Next, the stator assembly 3 is integrally formed with the mold resin 2, and the mold stator 1 is manufactured (step ST104 in FIG. 2).

モールド固定子1は、モールド樹脂2により回転軸10を中心とする概略円筒状に形成される。このモールド樹脂2は、電動機100の外郭を構成する。ここで、駆動回路基板4等は、強度的に弱い構造であるため低圧成形が望ましい。このため、モールド樹脂2としては、例えば、不飽和ポリエステル樹脂等の熱硬化性樹脂が用いられる。   The mold stator 1 is formed in a substantially cylindrical shape centered on the rotation shaft 10 by the mold resin 2. This mold resin 2 constitutes the outline of the electric motor 100. Here, since the drive circuit board 4 and the like have a weak structure, low pressure molding is desirable. For this reason, as the mold resin 2, for example, a thermosetting resin such as an unsaturated polyester resin is used.

モールド固定子1の軸方向の一方の端部(図1の駆動回路基板4側の端部)には、回転軸10を挿通すると共に、負荷側軸受15aを嵌め込み支持する軸受ハウジング部2bを形成する。   At one end in the axial direction of the mold stator 1 (the end on the side of the drive circuit board 4 in FIG. 1), the rotary shaft 10 is inserted, and a bearing housing portion 2b for fitting and supporting the load-side bearing 15a is formed. To do.

また、モールド固定子1の軸方向の他方の端部(上述した基板側の反対側の端部)には、後述する回転子組立15を挿入して収容するためのすり鉢状の凹部を形成する。   In addition, a mortar-shaped recess for inserting and accommodating a rotor assembly 15 to be described later is formed at the other end in the axial direction of the mold stator 1 (the end opposite to the above-described substrate side). .

モールド固定子1に形成された凹部の開口部は、図1において導電性ブラケット20が設けられている部分である。なお、この導電性ブラケット20は、例えば導電性の金属をプレス加工して製造される。   The opening part of the recessed part formed in the mold stator 1 is a part in which the conductive bracket 20 is provided in FIG. The conductive bracket 20 is manufactured, for example, by pressing a conductive metal.

上述したようにモールド固定子1が製造される一方で、回転軸10、円環状の回転子絶縁部12、永久磁石である回転子磁石13、および位置検出用磁石11を組み合わせて、回転子14が製造される(図2のステップST105)。   While the mold stator 1 is manufactured as described above, the rotor 14 is formed by combining the rotating shaft 10, the annular rotor insulating portion 12, the rotor magnet 13 that is a permanent magnet, and the position detection magnet 11. Is manufactured (step ST105 in FIG. 2).

回転子14は、回転軸10の外周部に円環状の回転子絶縁部12が設けられ、その回転子絶縁部12の外周側に周設され固定子鉄心8と対向して回転子磁石13が配設され、回転軸10の軸方向において回転子磁石13と駆動回路基板4との間に位置検出用磁石11が設けられ構成されている。この回転子14は、回転軸10を中心に回転自在であり、固定子6からの回転磁界によって回転力を得て回転軸10にトルクを伝達し、回転軸10に設けられた図示しない負荷(例えば、空気調和機の室内機あるいは室外機に内蔵されるファン等)を駆動する。   The rotor 14 is provided with an annular rotor insulating portion 12 on the outer peripheral portion of the rotating shaft 10. The rotor magnet 13 is provided on the outer peripheral side of the rotor insulating portion 12 so as to face the stator core 8. A position detecting magnet 11 is provided between the rotor magnet 13 and the drive circuit board 4 in the axial direction of the rotating shaft 10. The rotor 14 is rotatable about the rotating shaft 10, obtains a rotating force by a rotating magnetic field from the stator 6, transmits torque to the rotating shaft 10, and loads (not shown) provided on the rotating shaft 10 (not shown). For example, an air conditioner indoor unit or a fan built in an outdoor unit is driven.

回転子絶縁部12は、回転軸10と回転子磁石13とを絶縁すると共に、回転軸10と固定子鉄心8とを絶縁し、回転子14から固定子6へ流れる軸電流を低減するために設けられる。回転子磁石13、回転軸10、および位置検出用磁石11は、例えば、縦型成形機により射出された回転子絶縁部12で一体的に形成される。回転子絶縁部12には、例えば、PBT(ポリブチレンテレフタレート)、PPS(ポリフェニレンサルファイド)等の熱可塑性樹脂が用いられるが、これらの樹脂にガラス充填剤を配合したものも好適である。この回転子絶縁部12は、誘電体層を構成する。これにより、回転子14のラジアル方向のインピーダンスを高くすることができ、回転子14から固定子6へ流れる軸電流を低減することが可能である。   The rotor insulating portion 12 insulates the rotating shaft 10 and the rotor magnet 13, insulates the rotating shaft 10 and the stator core 8, and reduces the axial current flowing from the rotor 14 to the stator 6. Provided. The rotor magnet 13, the rotation shaft 10, and the position detection magnet 11 are integrally formed by, for example, a rotor insulating portion 12 injected by a vertical molding machine. For the rotor insulating portion 12, for example, a thermoplastic resin such as PBT (polybutylene terephthalate) or PPS (polyphenylene sulfide) is used, but those in which a glass filler is blended with these resins are also suitable. The rotor insulating portion 12 constitutes a dielectric layer. Thereby, the radial impedance of the rotor 14 can be increased, and the axial current flowing from the rotor 14 to the stator 6 can be reduced.

また、回転子磁石13としては、熱可塑性樹脂に磁性材を混合して成形された樹脂磁石、希土類磁石(ネオジム、サマリウム鉄)、またはフェライト焼結磁石等が使用される。   Further, as the rotor magnet 13, a resin magnet formed by mixing a magnetic material with a thermoplastic resin, a rare earth magnet (neodymium, samarium iron), a ferrite sintered magnet, or the like is used.

つぎに、図2に示すように、回転子14に負荷側軸受(第1の軸受)15a、反負荷側軸受(第2の軸受)15b、負荷側円盤状導体(第1の円盤状導体)16a、および反負荷側円盤状導体(第2の円盤状導体)16bが組み付けられることにより、回転子組立15が製造される(図2のステップST106)。   Next, as shown in FIG. 2, the rotor 14 has a load-side bearing (first bearing) 15a, an anti-load-side bearing (second bearing) 15b, and a load-side disk-shaped conductor (first disk-shaped conductor). The rotor assembly 15 is manufactured by assembling 16a and the anti-load-side disk-shaped conductor (second disk-shaped conductor) 16b (step ST106 in FIG. 2).

回転軸10の軸方向において、ファン等の負荷を接続する側の端部(以下、「負荷側端部」という)から負荷側円盤状導体16aを圧入し、さらに、負荷側軸受15aを圧入する。   In the axial direction of the rotary shaft 10, a load-side disk-shaped conductor 16 a is press-fitted from an end portion (hereinafter referred to as a “load-side end portion”) to which a load such as a fan is connected, and a load-side bearing 15 a is press-fitted. .

また、回転軸10の軸方向において、ファン等の負荷を接続する側と反対側の端部(以下、「反負荷側端部」という)から反負荷側円盤状導体16bを圧入し、さらに、反負荷側軸受15bを圧入する。   Further, in the axial direction of the rotary shaft 10, the anti-load-side disc-like conductor 16 b is press-fitted from an end portion (hereinafter referred to as “anti-load-side end portion”) opposite to a side to which a load such as a fan is connected, The anti-load side bearing 15b is press-fitted.

回転軸10は、これら負荷側軸受15aおよび反負荷側軸受15bによって、回転自在に支持される。   The rotating shaft 10 is rotatably supported by the load side bearing 15a and the anti-load side bearing 15b.

つぎに、モールド固定子1の凹部内に回転子組立15を挿入し(図2のステップST107)、導電性ブラケット20をモールド固定子1の凹部に圧入して、凹部の開口部を塞ぐ(図2のステップST108)。これにより、実施の形態1にかかる電動機100が製造される。   Next, the rotor assembly 15 is inserted into the recess of the mold stator 1 (step ST107 in FIG. 2), and the conductive bracket 20 is press-fitted into the recess of the mold stator 1 to close the opening of the recess (FIG. 2 step ST108). Thereby, the electric motor 100 concerning Embodiment 1 is manufactured.

回転子組立15がモールド固定子1に形成された凹部の開口部から凹部内へ挿入された際、回転軸10の負荷側端部は、軸受ハウジング部2bに挿通され、回転軸10に取り付けられた負荷側軸受15aが軸受ハウジング部2bに嵌め込まれる。この回転軸10の負荷側端部に上述したファン等の負荷が取り付けられる。一方、導電性ブラケット20がモールド樹脂2に形成された凹部の内周部2aへ圧入され開口部を塞ぐようにして嵌め込まれる際、この導電性ブラケット20の内側に、回転軸10の反負荷側端部から圧入された反負荷側軸受15bが嵌め込まれる。   When the rotor assembly 15 is inserted into the recess from the opening of the recess formed in the mold stator 1, the load side end of the rotating shaft 10 is inserted into the bearing housing portion 2 b and attached to the rotating shaft 10. The load side bearing 15a is fitted into the bearing housing portion 2b. The load such as the fan described above is attached to the load side end of the rotating shaft 10. On the other hand, when the conductive bracket 20 is press-fitted into the inner peripheral portion 2a of the concave portion formed in the mold resin 2 and is fitted so as to close the opening, the conductive bracket 20 is placed inside the conductive bracket 20 on the side opposite to the load side of the rotary shaft 10. The anti-load side bearing 15b press-fitted from the end is fitted.

ここで、実施の形態1にかかる電動機100の負荷側軸受15a、反負荷側軸受15b、負荷側円盤状導体16a、および反負荷側円盤状導体16bの詳細構成および回転軸10への組み付け位置について、図4を参照して説明する。図4は、実施の形態1にかかる電動機の負荷側軸受、反負荷側軸受、負荷側円盤状導体、および反負荷側円盤状導体の詳細構成および組み付け位置の一例を示す図である。なお、図4に示す例では、反負荷側軸受および反負荷側円盤状導体を構成する各構成部を括弧付きの符号で示している。   Here, the detailed configuration of the load-side bearing 15a, the anti-load-side bearing 15b, the load-side disk-shaped conductor 16a, and the anti-load-side disk-shaped conductor 16b of the electric motor 100 according to the first embodiment and the assembly position on the rotary shaft 10 are described. This will be described with reference to FIG. FIG. 4 is a diagram illustrating an example of a detailed configuration and an assembling position of the load-side bearing, the anti-load-side bearing, the load-side disc-shaped conductor, and the anti-load-side disc-shaped conductor of the electric motor according to the first embodiment. In addition, in the example shown in FIG. 4, each component which comprises an anti-load side bearing and an anti-load side disk-shaped conductor is shown with the code | symbol with a parenthesis.

負荷側軸受15aは、玉軸受けであり、回転軸10と一体的に回転する軸受内輪15a−3と、軸受ハウジング部2bの内周面に嵌め込まれる軸受外輪15a−1と、これらの軸受内輪15a−3と軸受外輪15a−1との間に配置された複数個の軸受転動体15a−2と、軸受転動体15a−2を潤滑に転動させるための潤滑油と、潤滑油を封入するための軸受シール板15a−4とを備えて構成されている。軸受外輪15a−1、軸受転動体15a−2、軸受内輪15a−3、軸受シール板15a−4は、一般に、鉄などの導体性の金属で構成される。軸受シール板15a−4は、軸受内輪15a−3とは接触せず、軸受外輪15a−1に固定されており、電気的に接続されている。   The load-side bearing 15a is a ball bearing and is a bearing inner ring 15a-3 that rotates integrally with the rotary shaft 10, a bearing outer ring 15a-1 that is fitted on the inner peripheral surface of the bearing housing portion 2b, and these bearing inner rings 15a. -3 and a bearing outer ring 15a-1, a plurality of bearing rolling elements 15a-2, lubricating oil for rolling the bearing rolling elements 15a-2 to lubricate, and sealing the lubricating oil Bearing seal plate 15a-4. The outer bearing ring 15a-1, the bearing rolling element 15a-2, the inner bearing ring 15a-3, and the bearing seal plate 15a-4 are generally made of a conductive metal such as iron. The bearing seal plate 15a-4 does not contact the bearing inner ring 15a-3, is fixed to the bearing outer ring 15a-1, and is electrically connected.

反負荷側軸受15bは、負荷側軸受15aと同様の玉軸受けであり、回転軸10と一体的に回転する軸受内輪15b−3と、導電性ブラケット20の内周面に嵌め込まれる軸受外輪15b−1と、これらの軸受内輪15b−3と軸受外輪15b−1との間に配置された複数個の軸受転動体15b−2と、軸受転動体15b−2を潤滑に転動させるための潤滑油と、潤滑油を封入するための軸受シール板15b−4とを備えて構成されている。軸受外輪15b−1、軸受転動体15b−2、軸受内輪15b−3、軸受シール板15b−4は、一般に、鉄などの導体性の金属で構成される。軸受シール板15b−4は、軸受内輪15b−3とは接触せず、軸受外輪15b−1に固定されており、電気的に接続されている。なお、この軸受外輪15b−1は、導電性ブラケット20と接触して電気的に接続されている。   The anti-load-side bearing 15b is a ball bearing similar to the load-side bearing 15a, and a bearing inner ring 15b-3 that rotates integrally with the rotary shaft 10 and a bearing outer ring 15b− that is fitted to the inner peripheral surface of the conductive bracket 20. 1, a plurality of bearing rolling elements 15 b-2 disposed between the bearing inner ring 15 b-3 and the bearing outer ring 15 b-1, and lubricating oil for rolling the bearing rolling elements 15 b-2 to lubrication And a bearing seal plate 15b-4 for enclosing the lubricating oil. The bearing outer ring 15b-1, the bearing rolling element 15b-2, the bearing inner ring 15b-3, and the bearing seal plate 15b-4 are generally made of a conductive metal such as iron. The bearing seal plate 15b-4 is not in contact with the bearing inner ring 15b-3, is fixed to the bearing outer ring 15b-1, and is electrically connected. The bearing outer ring 15b-1 is in contact with and electrically connected to the conductive bracket 20.

負荷側円盤状導体16aおよび反負荷側円盤状導体16bは、円盤状の導電性部材により形成されている。これらの負荷側円盤状導体16aおよび反負荷側円盤状導体16bは、上述したように、負荷側軸受15aおよび反負荷側軸受15bと同様に、例えば、回転軸10に圧入することにより嵌め合わされており、回転軸10と電気的に接続されている。また、これらの負荷側円盤状導体16aあるいは反負荷側円盤状導体16bは、各軸受外輪15a−1,15b−1および各軸受シール板15a−4,15b−4とはそれぞれ非接触状態で配置される。なお、図4に示す例では、負荷側円盤状導体16aあるいは反負荷側円盤状導体16bを負荷側軸受15aあるいは反負荷側軸受15bの回転子絶縁部12側の面に対向して配置する例を示したが、負荷側軸受15aあるいは反負荷側軸受15bの回転子絶縁部12側の面とは反対側の面に対向して配置してもよいことは言うまでもない。   The load side disk-shaped conductor 16a and the anti-load side disk-shaped conductor 16b are formed of a disk-shaped conductive member. As described above, the load-side disk-shaped conductor 16a and the anti-load-side disk-shaped conductor 16b are fitted together by, for example, press-fitting into the rotary shaft 10 in the same manner as the load-side bearing 15a and the anti-load-side bearing 15b. And is electrically connected to the rotating shaft 10. The load-side disc-shaped conductor 16a or the anti-load-side disc-shaped conductor 16b is arranged in a non-contact state with the bearing outer rings 15a-1, 15b-1 and the bearing seal plates 15a-4, 15b-4. Is done. In the example shown in FIG. 4, the load-side disk-shaped conductor 16a or the anti-load-side disk-shaped conductor 16b is disposed opposite to the surface of the load-side bearing 15a or the anti-load-side bearing 15b on the rotor insulating portion 12 side. However, it goes without saying that the load-side bearing 15a or the anti-load-side bearing 15b may be disposed so as to face the surface opposite to the surface on the rotor insulating portion 12 side.

本実施の形態では、図4に示すように、各軸受シール板15a−4,15b−4を各軸受内輪15a−3,15b−3の側面および各軸受外輪15a−1,15b−1の側面よりも軸方向内側に配置し、負荷側円盤状導体16aおよび反負荷側円盤状導体16bの外周径を軸受外輪15a−1の内周径より小さくしている。これにより、負荷側円盤状導体16aあるいは反負荷側円盤状導体16bと各軸受内輪15a−3,15b−3の側面とが接触状態となり、且つ、負荷側円盤状導体16aあるいは反負荷側円盤状導体16bと各軸受内輪15a−3,15b−3および各軸受シール板15a−4,15b−4とがそれぞれ非接触状態で近接して配置することが可能となり、負荷側円盤状導体16aあるいは反負荷側円盤状導体16bと各軸受シール板15a−4,15b−4との間にそれぞれ静電容量が形成される。   In the present embodiment, as shown in FIG. 4, the bearing seal plates 15a-4 and 15b-4 are connected to the side surfaces of the bearing inner rings 15a-3 and 15b-3 and the side surfaces of the bearing outer rings 15a-1 and 15b-1. The outer peripheral diameters of the load-side disc-shaped conductor 16a and the anti-load-side disc-shaped conductor 16b are smaller than the inner peripheral diameter of the bearing outer ring 15a-1. As a result, the load-side disk-shaped conductor 16a or the anti-load-side disk-shaped conductor 16b and the side surfaces of the bearing inner rings 15a-3 and 15b-3 are brought into contact with each other, and the load-side disk-shaped conductor 16a or the anti-load-side disk-shaped conductor The conductor 16b, the bearing inner rings 15a-3 and 15b-3, and the bearing seal plates 15a-4 and 15b-4 can be arranged close to each other in a non-contact state. Capacitances are respectively formed between the load-side disk-shaped conductor 16b and the bearing seal plates 15a-4 and 15b-4.

つぎに、上述したように構成された本実施の形態にかかる電動機100の動作について説明する。   Next, the operation of the electric motor 100 according to the present embodiment configured as described above will be described.

駆動回路基板4に実装された電力変換回路のインバータ回路のスイッチングに伴い、負荷側軸受15aおよび反負荷側軸受15b(以下、特に区別する必要のない場合には、単に「各軸受15a,15b」という)の軸受内輪15a−3,15b−3と軸受外輪15a−1,15b−1との間(以下、「軸受内外輪間」という)に電圧が誘起されたとき、各軸受外輪15a−1,15b−1と負荷側円盤状導体16aあるいは反負荷側円盤状導体16b(以下、特に区別する必要のない場合には、単に「各円盤状導体16a,16b」という)との間が高周波的に導通状態になる。   As the inverter circuit of the power conversion circuit mounted on the drive circuit board 4 is switched, the load-side bearing 15a and the anti-load-side bearing 15b (hereinafter referred to as “bearings 15a and 15b” unless otherwise required). When the voltage is induced between the bearing inner rings 15a-3 and 15b-3 and the bearing outer rings 15a-1 and 15b-1 (hereinafter referred to as “between the bearing inner and outer rings”), the bearing outer rings 15a-1 , 15b-1 and the load-side disk-shaped conductor 16a or the anti-load-side disk-shaped conductor 16b (hereinafter simply referred to as “the disk-shaped conductors 16a and 16b” unless otherwise distinguished). Will be in a conductive state.

これは、上述したように、各軸受シール板15a−4,15b−4と各円盤状導体16a,16bとが非接触状態で近接して配置されていることによって、軸受シール板15a−4,15b−4と各円盤状導体16a,16bとの間に静電容量が形成され、軸受内外輪間に誘起される電圧の高周波成分に対して、各軸受シール板15a−4,15b−4と電気的に接続されている各軸受外輪15a−1,15b−1と各円盤状導体16a,16bとの間が低インピーダンス状態(導通状態)となるためである。   As described above, the bearing seal plates 15a-4, 15b-4 and the disc-shaped conductors 16a, 16b are arranged in close contact with each other, so that the bearing seal plates 15a-4, 15b-4 and each disk-shaped conductor 16a, 16b, electrostatic capacity is formed, and each bearing seal plate 15a-4, 15b-4 is applied to the high frequency component of the voltage induced between the bearing inner and outer rings. This is because the electrically connected bearing outer rings 15a-1 and 15b-1 and the disk-shaped conductors 16a and 16b are in a low impedance state (conductive state).

つまり、本実施の形態では、各軸受内輪15a−3,15b−3と共に回転し、軸電流の通流経路となる各円盤状導体16a,16bと、モールド固定子1の軸受ハウジング部2bあるいは導通性ブラケット20に固定された各軸受外輪15a−1,15b−1および各軸受シール板15a−4,15b−4とが非接触状態で、軸受内外輪間を通流する軸電流が各軸受外輪15a−1,15b−1と各円盤状導体16a,16bとの間に流れ、軸受転動体を介して軸受内外輪間を通流する軸電流を低減することができる。したがって、長期使用時においても、各軸受15a,15b内の電食の抑制効果を維持することができ、この電食の進行による各軸受内輪15a−3,15b−3、各軸受外輪15a−1,15b−1、あるいは各軸受転動体15a−2,15b−2の波状摩耗現象の発生、およびこの波状摩耗現象の発生に起因した異常音の発生を抑制することができる。   In other words, in the present embodiment, the disk-shaped conductors 16a and 16b that rotate together with the bearing inner rings 15a-3 and 15b-3 and serve as a passage path for the axial current, and the bearing housing portion 2b of the mold stator 1 or the conductive state. Shaft outer currents 15a-1 and 15b-1 fixed to the conductive bracket 20 and bearing seal plates 15a-4 and 15b-4 are not in contact with each other, and an axial current flowing between the bearing inner and outer rings is caused by the bearing outer rings. The axial current flowing between 15a-1 and 15b-1 and the respective disk-shaped conductors 16a and 16b and flowing between the bearing inner and outer rings via the bearing rolling elements can be reduced. Therefore, even during long-term use, the effect of suppressing electrolytic corrosion in the bearings 15a and 15b can be maintained, and the bearing inner rings 15a-3 and 15b-3 and the bearing outer rings 15a-1 due to the progress of the electrolytic corrosion. , 15b-1, or the bearing rolling elements 15a-2, 15b-2, and the generation of the wave-like wear phenomenon, and the generation of abnormal noise due to the occurrence of the wave-like wear phenomenon can be suppressed.

以上説明したように、実施の形態1の電動機によれば、導電性部材で形成され、回転軸と電気的に接続されると共に、負荷側軸受および反負荷側軸受に関して、それぞれ、軸受シール板と非接触状態で近接して配置され、この軸受シール板との間に静電容量を形成する負荷側円盤状導体および反負荷側円盤状導体を備え、インバータ回路のスイッチングに伴い軸受内外輪間に誘起された電圧に含まれる高周波成分に対して、軸受内外輪間が各軸受外輪と非接触状態の各円盤状導体(負荷側円盤状導体および反負荷側円盤状導体)を介して導通状態となり、軸受内外輪間を通流する軸電流が各軸受外輪と各円盤状導体を経由して流れ、各軸受転動体を介して軸受内外輪間を通流する軸電流を低減することができるので、長期使用時においても、各軸受内の電食の抑制効果を維持することができ、この電食の進行による各軸受内輪、各軸受外輪、あるいは各軸受転動体の波状摩耗現象の発生、およびこの波状摩耗現象の発生に起因した異常音の発生を抑制することができる。   As described above, according to the electric motor of the first embodiment, it is formed of a conductive member and is electrically connected to the rotating shaft, and with respect to the load-side bearing and the anti-load-side bearing, respectively, A load-side disk-shaped conductor and an anti-load-side disk-shaped conductor that are arranged close to each other in a non-contact state and form a capacitance between the bearing seal plate and between the bearing inner and outer rings when the inverter circuit is switched. With respect to the high-frequency component contained in the induced voltage, the inner and outer rings of the bearing become conductive through the respective disk-shaped conductors (the load-side disk-shaped conductor and the anti-load-side disk-shaped conductor) that are not in contact with the bearing outer rings. Since the axial current flowing between the bearing inner and outer rings flows via each bearing outer ring and each disk-shaped conductor, the axial current flowing between the bearing inner and outer rings via each bearing rolling element can be reduced. Even during long-term use, The effect of suppressing electrolytic corrosion in the bearing can be maintained, and the occurrence of the wave wear phenomenon of each bearing inner ring, each bearing outer ring, or each rolling element of the bearing due to the progress of this electric corrosion, and the occurrence of this wave wear phenomenon The occurrence of abnormal noise can be suppressed.

また、固定子鉄心と回転軸との間に、回転子絶縁部(誘電体層)を設け、回転軸と固定子鉄心とを絶縁し、また、この誘電体層を、回転軸と回転子磁石との間に設けることにより、回転軸と回転子磁石とを絶縁することが可能となり、回転子のラジアル方向のインピーダンスを高くすることができ、回転子から固定子へ流れる軸電流を低減することが可能である。   In addition, a rotor insulator (dielectric layer) is provided between the stator core and the rotating shaft to insulate the rotating shaft from the stator core, and this dielectric layer is also connected to the rotating shaft and the rotor magnet. Between the rotor shaft and the rotor magnet, it is possible to insulate the rotor in the radial direction and reduce the axial current flowing from the rotor to the stator. Is possible.

また、モールド固定子を形成し、電動機の外郭を構成するモールド樹脂は、熱可塑性樹脂であるため、低圧成形が可能となり、強度的に弱い構造である駆動回路基板等を容易に一体成形することが可能である。   In addition, since the mold resin that forms the mold stator and forms the outer shell of the motor is a thermoplastic resin, low-pressure molding is possible, and a drive circuit board or the like having a weak structure can be easily integrally molded. Is possible.

実施の形態2.
図5は、実施の形態2にかかる電動機の負荷側軸受、反負荷側軸受、負荷側円盤状導体、および反負荷側円盤状導体の詳細構成および組み付け位置の一例を示す図である。なお、図5に示す例では、反負荷側軸受および反負荷側円盤状導体を構成する各構成部を括弧付きの符号で示している。
Embodiment 2.
FIG. 5 is a diagram illustrating an example of a detailed configuration and an assembling position of the load side bearing, the anti-load side bearing, the load side disk-shaped conductor, and the anti-load side disk-shaped conductor of the electric motor according to the second embodiment. In addition, in the example shown in FIG. 5, each component which comprises an anti-load side bearing and an anti-load side disk shaped conductor is shown with the code | symbol with a parenthesis.

本実施の形態では、図5に示すように、各軸受シール板15a−4,15b−4を各軸受内輪15a−3,15b−3の側面および各軸受外輪15a−1,15b−1の側面と同一面あるいは外側に配置し、各円盤状導体16a,16bの外周径を各軸受外輪15a−1,15b−1の外周径と同一あるいは大きくすると共に、各軸受15a,15bと各円盤状導体16a,16bとの間にそれぞれスペーサ31を配置している。これにより、各円盤状導体16a,16bと各軸受内輪15a−3,15b−3および各軸受シール板15a−4,15b−4とがそれぞれ非接触状態で近接して配置することが可能となり、各円盤状導体16a,16bと各軸受シール板15a−4,15b−4との間、および各円盤状導体16a,16bと各軸受外輪15a−1,15b−1との間にそれぞれ静電容量が形成される。   In this embodiment, as shown in FIG. 5, the bearing seal plates 15a-4 and 15b-4 are connected to the side surfaces of the bearing inner rings 15a-3 and 15b-3 and the side surfaces of the bearing outer rings 15a-1 and 15b-1. The outer peripheral diameters of the disc-shaped conductors 16a and 16b are made the same as or larger than the outer peripheral diameters of the bearing outer rings 15a-1 and 15b-1, and the bearings 15a and 15b and the disc-shaped conductors are arranged. Spacers 31 are arranged between 16a and 16b, respectively. As a result, the disk-shaped conductors 16a and 16b, the bearing inner rings 15a-3 and 15b-3, and the bearing seal plates 15a-4 and 15b-4 can be arranged close to each other in a non-contact state. Capacitance between each disk-shaped conductor 16a, 16b and each bearing seal plate 15a-4, 15b-4, and between each disk-shaped conductor 16a, 16b and each bearing outer ring 15a-1, 15b-1. Is formed.

このため、駆動回路基板4に実装された電力変換回路のインバータ回路のスイッチングに伴い、各軸受15a,15bの軸受内外輪間に電圧が誘起され、各軸受外輪15a−1,15b−1と各円盤状導体16a,16bとの間が高周波的に導通状態となると、上述したように、各軸受外輪15a−1,15b−1と各円盤状導体16a,16bとの間、および軸受シール板15a−4,15b−4と各円盤状導体16a,16bとの間の双方に静電容量が形成されることにより、軸受内外輪間に誘起される電圧の高周波成分に対して、実施の形態1よりも各軸受外輪15a−1,15b−1と各円盤状導体16a,16bとの間のインピーダンスがより低下し、軸受内外輪間を通流する軸電流が各軸受外輪15a−1,15b−1と各円盤状導体16a,16bとの間により多く流れるため、軸受転動体を介して軸受内外輪間を通流する軸電流をより低減することができる。したがって、長期使用時において、実施の形態1よりも各軸受15a,15b内の電食の抑制効果を高めることができ、この電食の進行による各軸受内輪15a−3,15b−3、各軸受外輪15a−1,15b−1、あるいは各軸受転動体15a−2,15b−2の波状摩耗現象の発生、およびこの波状摩耗現象の発生に起因した異常音の発生をさらに抑制することができる。   For this reason, with the switching of the inverter circuit of the power conversion circuit mounted on the drive circuit board 4, a voltage is induced between the bearing inner and outer rings of the bearings 15a and 15b, and the bearing outer rings 15a-1 and 15b-1 When the electrical connection between the disk-shaped conductors 16a and 16b becomes high-frequency, as described above, the bearing outer rings 15a-1 and 15b-1, the disk-shaped conductors 16a and 16b, and the bearing seal plate 15a. First Embodiment With respect to the high-frequency component of the voltage induced between the bearing inner and outer rings by forming electrostatic capacitances between -4, 15b-4 and the respective disk-shaped conductors 16a, 16b, the first embodiment The impedance between the bearing outer rings 15a-1 and 15b-1 and the disk-shaped conductors 16a and 16b is further reduced, and the axial current flowing between the bearing inner and outer rings is reduced to the bearing outer rings 15a-1 and 15b-. 1 and each disk To flow more to between the conductor 16a, 16b, it is possible to further reduce the axial current flowing through the inter-bearing inside the outer ring via the bearing rolling elements. Therefore, in the long-term use, the effect of suppressing the electric corrosion in the bearings 15a and 15b can be enhanced as compared with the first embodiment, and the bearing inner rings 15a-3 and 15b-3 and the bearings due to the progress of the electric corrosion. It is possible to further suppress the occurrence of the wave-like wear phenomenon of the outer rings 15a-1, 15b-1, or the respective bearing rolling elements 15a-2, 15b-2, and the generation of abnormal noise due to the occurrence of the wave-like wear phenomenon.

以上説明したように、実施の形態2の電動機によれば、各軸受と各円盤状導体との間にそれぞれスペーサ31を配置し、各円盤状導体と各軸受シール板との間、および各円盤状導体と各軸受外輪との間にそれぞれ静電容量を形成するようにしたので、軸受内外輪間に誘起される電圧の高周波成分に対して、実施の形態1よりも各軸受外輪と各円盤状導体との間のインピーダンスがより低下し、軸受内外輪間を通流する軸電流が各軸受外輪と各円盤状導体との間により多く流れるため、軸受転動体を介して軸受内外輪間を通流する軸電流をより低減することができる。したがって、長期使用時において、実施の形態1よりも各軸受内の電食の抑制効果を高めることができ、この電食の進行による各軸受内輪、各軸受外輪、あるいは各軸受転動体の波状摩耗現象の発生、およびこの波状摩耗現象の発生に起因した異常音の発生をさらに抑制することができる。   As described above, according to the electric motor of the second embodiment, the spacer 31 is disposed between each bearing and each disk-shaped conductor, and between each disk-shaped conductor and each bearing seal plate, and each disk. Since the electrostatic capacity is formed between the cylindrical conductor and each bearing outer ring, each bearing outer ring and each disk are more than the first embodiment with respect to the high frequency component of the voltage induced between the bearing inner and outer rings. Since the impedance between the inner and outer rings of the bearing is further reduced, and the axial current flowing between the inner and outer rings of the bearing flows more between the outer rings of the bearings and the disk-shaped conductors, the bearing inner and outer rings are interposed between the bearing rolling elements. The axial current that flows can be further reduced. Therefore, during the long-term use, the effect of suppressing electrolytic corrosion in each bearing can be enhanced compared to the first embodiment, and the wavy wear of each bearing inner ring, each bearing outer ring, or each bearing rolling element due to the progress of this electrolytic corrosion. It is possible to further suppress the occurrence of the phenomenon and the generation of abnormal noise due to the occurrence of the wavy wear phenomenon.

実施の形態3.
本実施の形態では、上述した実施の形態1乃至2にかかる電動機100を搭載した空気調和機300について、図6を参照して説明する。図6は、実施の形態3にかかる空気調和機の室内機および室外機の概観図である。
Embodiment 3.
In the present embodiment, an air conditioner 300 equipped with the electric motor 100 according to the first and second embodiments will be described with reference to FIG. FIG. 6 is an overview of the indoor unit and the outdoor unit of the air conditioner according to the third embodiment.

図6に示すように、実施の形態3にかかる空気調和機300は、室内機310と、室内機310に接続される室外機320とを備える。室内機310は、室内機用送風機(図示せず)を搭載し、室外機320は室外機用送風機330を搭載している。   As shown in FIG. 6, the air conditioner 300 according to the third embodiment includes an indoor unit 310 and an outdoor unit 320 connected to the indoor unit 310. The indoor unit 310 is equipped with an indoor unit blower (not shown), and the outdoor unit 320 is equipped with an outdoor unit blower 330.

室外機用送風機330および室内機用送風機は、それぞれ駆動源として実施の形態1乃至2で説明した電動機100を内蔵している。空気調和機300の主要部品である室外機用送風機330および室内機用送風機に電動機100を搭載することにより、空気調和機300の耐久性が向上すると共に、軸受の電食により発生する騒音を軽減することができる。軸受の電食によって発生する騒音は、静音性が求められる居住空間で長時間使用する空気調和機300の室内機310において特に問題となる。また、電食に対する耐力を向上することは、製品の信頼性に大きく寄与する。なお、上述した実施の形態1乃至2にかかる電動機100は、空気調和機300の他にも、例えば換気扇、家電機器、工作機などに搭載して利用することができる。   The outdoor unit blower 330 and the indoor unit blower each incorporate the electric motor 100 described in Embodiments 1 and 2 as a drive source. By mounting the electric motor 100 on the outdoor unit blower 330 and the indoor unit blower, which are the main components of the air conditioner 300, the durability of the air conditioner 300 is improved and noise generated by electrolytic corrosion of the bearing is reduced. can do. Noise generated by electric corrosion of the bearing is a problem particularly in the indoor unit 310 of the air conditioner 300 that is used for a long time in a living space where quietness is required. Further, improving the resistance to electric corrosion greatly contributes to product reliability. In addition to the air conditioner 300, the electric motor 100 according to the first and second embodiments described above can be used by being mounted on, for example, a ventilation fan, a home appliance, a machine tool, or the like.

以上説明したように、実施の形態3の空気調和機によれば、実施の形態1乃至2の電動機を搭載することにより、耐久性の向上と長期に亘る静音性を実現することができ、製品の信頼性を向上させることが可能となる。   As described above, according to the air conditioner of the third embodiment, by mounting the electric motor of the first or second embodiment, the durability can be improved and the long-term quietness can be realized. It becomes possible to improve the reliability.

なお、以上の実施の形態に示した電動機、この電動機を搭載した空気調和機、およびこの電動機の製造方法は、本発明の内容の一例を示すものであり、更なる別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、一部を省略するなど、変更して構成することも可能であることは無論である。   The electric motor, the air conditioner equipped with the electric motor, and the method for manufacturing the electric motor shown in the above embodiment are examples of the contents of the present invention, and are combined with other known techniques. Of course, it is possible to change and configure such as omitting a part without departing from the gist of the present invention.

1 モールド固定子、2 モールド樹脂、2b 軸受ハウジング部、2a 内周部、3 固定子組立、4 駆動回路基板、6 固定子、7 巻線、8 固定子鉄心、9 インシュレータ、10 回転軸、11 位置検出用磁石、12 回転子絶縁部(誘電体層)、13 回転子磁石、14 回転子、15 回転子組立、15a 負荷側軸受(第1の軸受)、15b 反負荷側軸受(第2の軸受)、15a−1,15b−1 軸受外輪、15a−2,15b−2 軸受転動体、15a−3,15b−3 軸受内輪、15a−4,15b−4 軸受シール板、16a 負荷側円盤状導体(第1の円盤状導体)、16b 反負荷側円盤状導体(第2の円盤状導体)、20 導電性ブラケット、31 スペーサ、100 電動機、300 空気調和機、310 室内機、320 室外機、330 室外機用送風機。   DESCRIPTION OF SYMBOLS 1 Mold stator, 2 Mold resin, 2b Bearing housing part, 2a Inner peripheral part, 3 Stator assembly, 4 Drive circuit board, 6 Stator, 7 Winding, 8 Stator iron core, 9 Insulator, 10 Rotating shaft, 11 Magnet for position detection, 12 Rotor insulation (dielectric layer), 13 Rotor magnet, 14 Rotor, 15 Rotor assembly, 15a Load side bearing (first bearing), 15b Anti-load side bearing (second Bearing), 15a-1, 15b-1 Bearing outer ring, 15a-2, 15b-2 Bearing rolling element, 15a-3, 15b-3 Bearing inner ring, 15a-4, 15b-4 Bearing seal plate, 16a Load side disk shape Conductor (first disk-shaped conductor), 16b Counter load side disk-shaped conductor (second disk-shaped conductor), 20 Conductive bracket, 31 Spacer, 100 Electric motor, 300 Air conditioner, 310 Indoor unit, 3 20 Outdoor unit, 330 Blower for outdoor unit.

Claims (8)

環状の固定子鉄心を有する固定子と、
前記固定子の内側に配置され、前記固定子鉄心と対向して回転軸の外周側に配置された永久磁石を有する回転子と、
軸受外輪、軸受内輪、複数個の軸受転動体、および、前記軸受外輪と電気的に接続され、前記軸受転動体を潤滑に転動させる潤滑油を封入するための軸受シール板を備えて構成され、前記回転軸を回転自在に支持する第1の軸受および第2の軸受と、
導電性部材で形成され、前記回転軸と電気的に接続されると共に、前記第1の軸受に関して、前記軸受シール板および前記軸受外輪と非接触状態で近接して配置され、前記軸受シール板との間、あるいは、前記軸受シール板および前記軸受外輪との間に静電容量を形成する第1の円盤状導体と、
導電性部材で形成され、前記回転軸と電気的に接続されると共に、前記第2の軸受に関して、前記軸受シール板および前記軸受外輪と非接触状態で近接して配置され、前記軸受シール板との間、あるいは、前記軸受シール板および前記軸受外輪との間に静電容量を形成する第2の円盤状導体と、
を備えることを特徴とする電動機。
A stator having an annular stator core;
A rotor having a permanent magnet disposed on the inner side of the stator and disposed on the outer peripheral side of the rotation shaft facing the stator core;
A bearing outer ring, a bearing inner ring, a plurality of bearing rolling elements, and a bearing seal plate which is electrically connected to the bearing outer ring and encloses lubricating oil for rolling the bearing rolling elements to lubrication. A first bearing and a second bearing that rotatably support the rotating shaft;
Formed of a conductive member, electrically connected to the rotary shaft, and arranged in close contact with the bearing seal plate and the bearing outer ring in a non-contact state with respect to the first bearing; Or a first disk-shaped conductor that forms a capacitance between the bearing seal plate and the bearing outer ring,
Formed of a conductive member, electrically connected to the rotating shaft, and disposed in close contact with the bearing seal plate and the bearing outer ring with respect to the second bearing, Or a second disk-shaped conductor that forms a capacitance between the bearing seal plate and the bearing outer ring,
An electric motor comprising:
前記回転子を回転駆動する駆動回路が実装され、前記固定子の軸方向端部に、軸方向に対して略垂直に配設される環状の駆動回路基板と、
前記回転軸を挿通して前記第1の軸受の前記軸受外輪を嵌め込み支持する軸受ハウジングと前記回転子を収容可能な凹部とが形成され、前記固定子および前記駆動回路基板を一体的に成形するモールド樹脂と、
前記モールド樹脂の前記凹部の内周部に嵌め込まれ、前記凹部の開口部を塞ぎつつ、前記第2の軸受の前記軸受外輪を嵌め込み支持する導電性ブラケットと、
を備えることを特徴とする請求項1に記載の電動機。
A drive circuit for rotating the rotor is mounted, and an annular drive circuit board disposed substantially perpendicular to the axial direction at the axial end of the stator;
A bearing housing for inserting and supporting the bearing outer ring of the first bearing through the rotating shaft and a recess capable of accommodating the rotor are formed, and the stator and the drive circuit board are integrally formed. Mold resin,
A conductive bracket that is fitted into the inner peripheral portion of the concave portion of the mold resin and plugs and supports the bearing outer ring of the second bearing while closing the opening of the concave portion;
The electric motor according to claim 1, comprising:
前記第1の軸受と前記第1の円盤状導体との間、および、前記第2の軸受と第2の円盤状導体との間にスペーサを挿入したことを特徴とする請求項1または2に記載の電動機。   The spacer according to claim 1 or 2, wherein a spacer is inserted between the first bearing and the first disk-shaped conductor, and between the second bearing and the second disk-shaped conductor. The electric motor described. 前記固定子鉄心と前記回転軸との間に誘電体層が設けられていることを特徴とする請求項1〜3のいずれか一項に記載の電動機。   The electric motor according to any one of claims 1 to 3, wherein a dielectric layer is provided between the stator core and the rotating shaft. 前記誘電体層は、前記回転軸と前記永久磁石との間に設けられていることを特徴とする請求項4に記載の電動機。   The electric motor according to claim 4, wherein the dielectric layer is provided between the rotating shaft and the permanent magnet. 前記モールド樹脂は、熱可塑性樹脂であることを特徴とする請求項1〜5のいずれか一項に記載の電動機。   The electric motor according to claim 1, wherein the mold resin is a thermoplastic resin. 請求項1〜6のいずれか一項に記載の電動機を搭載したことを特徴とする空気調和機。   An air conditioner equipped with the electric motor according to any one of claims 1 to 6. 請求項2〜6のいずれか一項に記載の電動機の製造方法であって、
前記固定子を製造するステップと、
前記駆動回路基板を製造するステップと、
前記固定子に前記駆動回路基板を組み付け、固定子組立を製造するステップと、
前記固定子組立を前記モールド樹脂にて一体成形してモールド固定子を製造するステップと、
前記回転子を製造するステップと、
前記回転軸に前記第1の円盤状導体と前記第1の軸受と第2の円盤状導体と前記第2の軸受とを圧入し、回転子組立を製造するステップと、
前記凹部内に前記回転子を挿入するステップと、
前記導電性ブラケットを前記凹部内に圧入し前記開口部を塞ぐステップと、
を含むことを特徴とする電動機の製造方法。
It is a manufacturing method of the electric motor according to any one of claims 2 to 6,
Manufacturing the stator;
Manufacturing the drive circuit board;
Assembling the drive circuit board to the stator to produce a stator assembly;
Producing the mold stator by integrally molding the stator assembly with the mold resin; and
Manufacturing the rotor;
Press-fitting the first disk-shaped conductor, the first bearing, the second disk-shaped conductor, and the second bearing into the rotating shaft, and manufacturing a rotor assembly;
Inserting the rotor into the recess;
Press-fitting the conductive bracket into the recess and closing the opening;
A method for manufacturing an electric motor, comprising:
JP2012222195A 2012-10-04 2012-10-04 Electric motor, air conditioner equipped with the electric motor, and method for manufacturing the electric motor Expired - Fee Related JP5490200B2 (en)

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