JP5145893B2 - Electric water pump - Google Patents

Electric water pump Download PDF

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JP5145893B2
JP5145893B2 JP2007300717A JP2007300717A JP5145893B2 JP 5145893 B2 JP5145893 B2 JP 5145893B2 JP 2007300717 A JP2007300717 A JP 2007300717A JP 2007300717 A JP2007300717 A JP 2007300717A JP 5145893 B2 JP5145893 B2 JP 5145893B2
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permanent magnet
rotor
peripheral surface
stator
hole portion
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JP2009127450A (en
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毘 海野
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Aisin Corp
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Aisin Seiki Co Ltd
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Description

本発明は主に、自動車用内燃機関の冷却水の循環に使用する電動ウォータポンプに関する。   The present invention mainly relates to an electric water pump used for circulating cooling water in an automobile internal combustion engine.

一般に、自動車用内燃機関の内部に設けられた内燃機関を冷却するための水路の中には、製造時に意図せず残留した初期異物が存在する。初期異物は、その多くが内燃機関の金属部品の切削加工時等に発生する切り粉であり、磁性体が多く含まれている。   In general, in a water channel for cooling an internal combustion engine provided in an internal combustion engine for automobiles, initial foreign matters that remain unintentionally during production exist. Most of the initial foreign matters are swarf generated at the time of cutting metal parts of the internal combustion engine, and contain a large amount of magnetic material.

従来、初期異物がモータ内部へ流入することを抑制する電動ウォータポンプとしては、特許文献１に示すものが知られている。この電動ウォータポンプは、冷却水の吸入口と吐出口とを備えた水室と、水室と軸受部とを連係するモータ側ハウジング内に形成された液体回路と、回転シャフトを支持する軸受と、回転シャフトと共に回転するロータと、液体回路に設けられたフィルタとを備えている。フィルタが、液体回路に液体を吸入する液体回路口から突出して設けられ、水室内でインペラによって形成された液体の流れ方向に沿った面を有する。
特開２００５−２１４０２２号公報 Conventionally, what is shown in patent document 1 is known as an electric water pump which suppresses that an initial foreign material flows into the inside of a motor. This electric water pump includes a water chamber having a cooling water suction port and a discharge port, a liquid circuit formed in a motor-side housing that links the water chamber and the bearing portion, and a bearing that supports the rotating shaft. And a rotor that rotates together with the rotating shaft, and a filter provided in the liquid circuit. The filter is provided so as to protrude from the liquid circuit port for sucking the liquid into the liquid circuit, and has a surface along the liquid flow direction formed by the impeller in the water chamber.
Japanese Patent Laying-Open No. 2005-214022

しかしながら、特許文献１の発明においては、フィルタの目が細かい場合、フィルタに異物が付着し、ついにはフィルタが目詰まりを起こして液体が液体回路に流入しなくなる。液体が流入しなくなると、液体による回転シャフトと軸受との潤滑効果が薄れて摺動抵抗が大きくなり、電動ウォータポンプの作動低下を招くおそれがあった。   However, in the invention of Patent Document 1, when the filter has a fine mesh, foreign matter adheres to the filter, and finally the filter is clogged, so that the liquid does not flow into the liquid circuit. When the liquid does not flow, the lubrication effect between the rotating shaft and the bearing due to the liquid is reduced, and the sliding resistance is increased, which may cause a reduction in the operation of the electric water pump.

フィルタの目が粗い場合には、液体中の異物がフィルタを通過し、液体回路に流入する。異物は液体回路を介して、軸受部に流入し、ついにはロータを構成する永久磁石の磁力によりロータに吸着する。ロータに異物が吸着すると、モータ側ハウジングとロータとが異物を介して擦れ合い、電動ウォータポンプの作動低下を招くおそれがあった。   When the filter is coarse, foreign matter in the liquid passes through the filter and flows into the liquid circuit. The foreign matter flows into the bearing portion through the liquid circuit, and is finally attracted to the rotor by the magnetic force of the permanent magnet constituting the rotor. When foreign matter is adsorbed on the rotor, the motor-side housing and the rotor rub against each other through the foreign matter, which may cause a reduction in the operation of the electric water pump.

本発明は上記問題点に鑑み、電動ウォータポンプの回転子（ロータ）の外周面と固定子（モータ側ハウジング）の内周面との間の隙間に異物が入り込んでも、その異物により固定子と回転子との間の摺動抵抗の増加を抑制し、円滑に作動可能な電動ウォータポンプを提供することを技術的課題とする。   In view of the above problems, the present invention eliminates the possibility that foreign matter enters the gap between the outer peripheral surface of the rotor (rotor) of the electric water pump and the inner peripheral surface of the stator (motor-side housing). An object of the present invention is to provide an electric water pump that can be smoothly operated by suppressing an increase in sliding resistance with a rotor.

上記の技術的課題を解決するために本発明に講じられた第１の技術的手段は、
吸入口と吐出口とを有するハウジングと、
前記ハウジングの中に設けられ、前記吸入口から前記吐出口へと冷却水を送り込むインペラと、
前記ハウジング内に回転自在に設けられるとともに、一端には前記インペラが設けられ、他端には円柱部の穴部に複数の永久磁石が設けられた回転子と、
前記回転子の周りに位置するよう前記ハウジングの内周に固設されるとともに、前記回転子に向けて突出する複数の突出部を持つコアと、前記コアに巻回されるコイルとを有する固定子と、を備え、
前記永久磁石と対向する前記回転子の外周面と前記固定子の内周面との間隙よりも、隣り合う前記永久磁石の間の前記回転子の外周面と前記固定子との間隙を大とするように、隣り合う前記永久磁石の間の前記回転子の外周面に平面部を少なくとも１つ以上形成し、
前記穴部は、前記永久磁石が挿入される主穴部及び前記永久磁石を前記円柱部に固定する樹脂が注入される副穴部を有し、
前記永久磁石の前記固定子と対向する面から発生する磁束が、隣り合う前記永久磁石の前記固定子と対向する面へと流れる磁路を形成し、
前記平面部と前記副穴部とで直線状の前記磁路を形成している電動ウォータポンプである。 In order to solve the above technical problem, the first technical means taken in the present invention is:
A housing having a suction port and a discharge port;
An impeller provided in the housing and for feeding cooling water from the suction port to the discharge port;
A rotor provided rotatably in the housing, provided with the impeller at one end, and provided with a plurality of permanent magnets in the hole of the cylindrical portion at the other end ,
A fixed member fixed to the inner periphery of the housing so as to be positioned around the rotor and having a core having a plurality of protrusions protruding toward the rotor, and a coil wound around the core. With children,
The gap between the outer peripheral surface of the rotor and the stator between the adjacent permanent magnets is larger than the gap between the outer peripheral surface of the rotor facing the permanent magnet and the inner peripheral surface of the stator. So as to form at least one plane portion on the outer peripheral surface of the rotor between the adjacent permanent magnets ,
The hole portion has a main hole portion into which the permanent magnet is inserted and a sub-hole portion into which resin for fixing the permanent magnet to the cylindrical portion is injected,
Magnetic flux generated from the surface of the permanent magnet facing the stator forms a magnetic path that flows to the surface of the adjacent permanent magnet facing the stator,
It is an electric water pump in which the flat magnetic path is formed by the flat portion and the auxiliary hole portion .

第２の技術的手段は、
吸入口と吐出口とを有するハウジングと、
前記ハウジングの中に設けられ、前記吸入口から前記吐出口へと冷却水を送り込むインペラと、
前記ハウジング内に回転自在に設けられるとともに、一端には前記インペラが設けられ、他端には円柱部の第１穴部に第１永久磁石が設けられ且つ前記円柱部の第２穴部に第２永久磁石が設けられた回転子と、
前記回転子の周りに位置するよう前記ハウジングの内周に固設されるとともに、前記回転子に向けて突出する複数の突出部を持つコアと、前記コアに巻回されるコイルとを有する固定子と、を備え、
前記第１永久磁石及び前記第２永久磁石と対向する前記回転子の外周面と前記固定子の内周面との間隙よりも、前記第１永久磁石と前記第２永久磁石との間の前記回転子の外周面と前記固定子との間隙を大とするように、前記第１永久磁石と前記第２永久磁石との間の前記回転子の外周面に平面部を形成し、
前記第１穴部は、前記第１永久磁石が挿入される第１主穴部、及び前記第１永久磁石を前記円柱部に固定する樹脂が注入される第１副穴部を有し、
前記第２穴部は、前記第２永久磁石が挿入される第２主穴部、及び前記第２永久磁石を前記円柱部に固定する樹脂が注入される第２副穴部を有し、
前記第１永久磁石の前記固定子と対向する面から発生する磁束が、前記第２永久磁石の前記固定子と対向する面へと流れる磁路を形成し、
前記平面部と前記第１副穴部及び前記第２副穴部とに挟まれて直線状の前記磁路を形成している電動ウォータポンプである。 The second technical means is
A housing having a suction port and a discharge port;
An impeller provided in the housing and for feeding cooling water from the suction port to the discharge port;
Together provided rotatably in the housing, the impeller is provided at one end, first the second hole portion of and the cylindrical portion first permanent magnet is provided in the first bore portion of the cylindrical portion to the other end 2 a rotor provided with permanent magnets ;
A fixed member fixed to the inner periphery of the housing so as to be positioned around the rotor and having a core having a plurality of protrusions protruding toward the rotor, and a coil wound around the core. With children,
The gap between the first permanent magnet and the second permanent magnet is larger than the gap between the outer peripheral surface of the rotor and the inner peripheral surface of the stator facing the first permanent magnet and the second permanent magnet. Forming a flat portion on the outer peripheral surface of the rotor between the first permanent magnet and the second permanent magnet so as to increase the gap between the outer peripheral surface of the rotor and the stator ;
The first hole portion includes a first main hole portion into which the first permanent magnet is inserted, and a first sub hole portion into which resin for fixing the first permanent magnet to the column portion is injected,
The second hole portion has a second main hole portion into which the second permanent magnet is inserted, and a second sub hole portion into which resin for fixing the second permanent magnet to the cylindrical portion is injected,
Magnetic flux generated from the surface of the first permanent magnet facing the stator forms a magnetic path that flows to the surface of the second permanent magnet facing the stator,
In the electric water pump, the linear magnetic path is formed between the flat portion, the first sub-hole portion, and the second sub-hole portion .

請求項１の発明によれば、隣り合う永久磁石の間の回転子の外周面に、回転子と固定子との間隙が広くなる平面部を形成することにより、冷却水路中に製造時に意図せず残留し、冷却水中に混入した磁性体異物は、永久磁石により平面部に吸着される。回転子が回転しても、平面部と固定子との間の隙間に吸着された磁性体異物は、永久磁石の磁力（磁性体異物の吸着力）により、平面部の外部に出ることが抑制される。その結果、回転子の外周面と固定子の内周面との間に異物が噛み込むことを抑制でき、回転子を円滑に回転させることができる。   According to the first aspect of the present invention, the flat surface portion in which the gap between the rotor and the stator is widened is formed on the outer peripheral surface of the rotor between the adjacent permanent magnets. The magnetic foreign matter that remains and is mixed in the cooling water is attracted to the flat surface by the permanent magnet. Even when the rotor rotates, the magnetic foreign matter adsorbed in the gap between the flat portion and the stator is prevented from coming out of the flat portion due to the magnetic force of the permanent magnet (adsorption force of the magnetic foreign matter). Is done. As a result, foreign matter can be prevented from being caught between the outer peripheral surface of the rotor and the inner peripheral surface of the stator, and the rotor can be smoothly rotated.

更に請求項１の発明によれば、隣り合う永久磁石の間の回転子の外周面を平面部にすることにより、簡単な加工で形成することができる。   Further, according to the first aspect of the present invention, the outer peripheral surface of the rotor between the adjacent permanent magnets can be formed by a simple process by making it a flat portion.

請求項２の発明によれば、第１永久磁石と第２永久磁石との間の回転子の外周面に、回転子と固定子との間隙が広くなる平面部を形成することにより、冷却水路中に製造時に意図せず残留し、冷却水中に混入した磁性体異物は、第１永久磁石及び第２永久磁石により平面部に吸着される。回転子が回転しても、平面部と固定子との間の隙間に吸着された磁性体異物は、第１永久磁石及び第２永久磁石の磁力（磁性体異物の吸着力）により、平面部の外部に出ることが抑制される。その結果、回転子の外周面と固定子の内周面との間に異物が噛み込むことを抑制でき、回転子を円滑に回転させることができる。   According to the second aspect of the present invention, the cooling water channel is formed by forming, on the outer peripheral surface of the rotor between the first permanent magnet and the second permanent magnet, a flat portion in which the gap between the rotor and the stator is widened. Magnetic foreign matter that remains unintentionally in the manufacturing process and is mixed in the cooling water is attracted to the flat portion by the first permanent magnet and the second permanent magnet. Even if the rotor rotates, the magnetic foreign matter adsorbed in the gap between the flat portion and the stator is caused by the magnetic force (adsorption force of the magnetic foreign matter) of the first permanent magnet and the second permanent magnet. It is suppressed to go outside. As a result, foreign matter can be prevented from being caught between the outer peripheral surface of the rotor and the inner peripheral surface of the stator, and the rotor can be smoothly rotated.

更に請求項２の発明によれば、回転子の内部に設けられた第１永久磁石と第１永久磁石との間の回転子の外周面を平面部にすることにより、簡単な加工で形成することができる。   Further, according to the second aspect of the present invention, the outer peripheral surface of the rotor between the first permanent magnet and the first permanent magnet provided in the rotor is formed into a flat portion so that it is formed by simple processing. be able to.

以下、本発明の実施形態を図１、図２及び図３に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1, 2, and 3.

電動ウォータポンプ１０は、吸入口１６ａと吐出口１６ｂとを有する金属性のハウジング１６と、ハウジング１６にボルト等により固定されるボディ１４と、ハウジング１６内に設けられ、冷却水を吸入及び吐出するインペラ１１と、永久磁石１８が内設された円柱部を有する回転子１２と、回転子１２を回転自在に支持する軸１３と、ボディ１４の内周に固設されるとともに回転子１２に向けて突出する複数の突出部１５ａを有するコア１５ｂ及びコア１５ｂに巻回されるコイル１５ｃとからなる固定子１５と、バッテリー（図示なし）からのコイル１５ｃへの通電を制御する通電制御装置２４とを備えている。   The electric water pump 10 is provided in a metallic housing 16 having a suction port 16a and a discharge port 16b, a body 14 fixed to the housing 16 with bolts or the like, and in the housing 16, and sucks and discharges cooling water. Impeller 11, rotor 12 having a cylindrical portion in which permanent magnet 18 is provided, shaft 13 that rotatably supports rotor 12, and fixed to the inner periphery of body 14 and toward rotor 12 A stator 15 comprising a core 15b having a plurality of projecting portions 15a projecting and a coil 15c wound around the core 15b, and an energization control device 24 for controlling energization of the coil 15c from a battery (not shown), It has.

吸入口１６ａの中空部の中心には、複数の支柱（図示なし）と接続され、軸１３の先端部の外径よりも若干内径が大きい円筒形状のボス部１６ｃが設けられている。冷却水は、ボス部１６ｃの外周面と吸入口１６ａの内周面との間からインペラ１１側へと流れる。   At the center of the hollow portion of the suction port 16a, a cylindrical boss portion 16c connected to a plurality of support columns (not shown) and having a slightly larger inner diameter than the outer diameter of the tip portion of the shaft 13 is provided. The cooling water flows from the outer peripheral surface of the boss portion 16c and the inner peripheral surface of the suction port 16a to the impeller 11 side.

回転子１２の中心には貫通孔１２ａが形成され、軸１３は、貫通孔１２ａに設けられる。軸１３の一端がボディ１４の孔１７に圧入され、その他端がボス部１６ｃに支持されている。   A through hole 12a is formed at the center of the rotor 12, and the shaft 13 is provided in the through hole 12a. One end of the shaft 13 is press-fitted into the hole 17 of the body 14, and the other end is supported by the boss portion 16c.

回転子１２は、回転すると冷却水の負圧により、ハウジング１６側へ移動しようとするため、ワッシャ２３を介してボス部１６ｃに当接している。   When the rotor 12 rotates, the rotor 12 tends to move to the housing 16 side due to the negative pressure of the cooling water.

ロータコア２０は、薄板の磁性材料（例えば、珪素鋼板）が軸方向に積層されて構成されている。ロータコア２０の内部には、４個の永久磁石１８ａ、１８ｂ、１８ｃ、１８ｄを内設するための、４個の穴部２１ａ、２１ｂ、２１ｃ、２１ｄが固定子１５と対向するように、図３に示す断面において正方形状に配列されている。穴部２１ａ、２１ｂ、２１ｃ、２１ｄは、両端が三角形状となった略長方形状であり、三角形状の内径側斜辺に永久磁石１８の位置決めを行う突起部２０ａが設けられている。穴部２１に、突出部１５ａと対向しＮ極とＳ極とが交互に着磁された永久磁石１８を挿入した後、永久磁石１８を固定するために樹脂が注入される。また、隣り合う永久磁石１８の間のロータコア２０の外周面には、平面部２５が形成されている。平面部２５は、永久磁石１８ａの永久磁石１８ｂと隣り合う端面から固定子１５方向に延長した平面とロータコア２０の外周面とが交わる接線と、隣り合う永久磁石１８ｂの永久磁石１８ａ側の端面から固定子１５方向に延長した平面とロータコア２０の外周面とが交わる接線とまで延在している。同様に、永久磁石１８ｂと永久磁石１８ｃとの間、永久磁石１８ｃと永久磁石１８ｄとの間、永久磁石１８ｄと永久磁石１８ａとの間にも平面部２５が形成されている。平面部２５が形成されたことにより、永久磁石１８と対向するロータコア２０の外周面と固定子１５の内周面との間隙よりも大きくなり、広隙部１９を有する。三角形状の外径側斜辺は、平面部２５とで幅の狭い直線状の磁路２２を形成している。   The rotor core 20 is configured by laminating thin magnetic materials (for example, silicon steel plates) in the axial direction. In the rotor core 20, the four holes 21a, 21b, 21c, 21d for installing the four permanent magnets 18a, 18b, 18c, 18d are opposed to the stator 15 as shown in FIG. Are arranged in a square shape in the cross section shown in FIG. The holes 21a, 21b, 21c, and 21d have a substantially rectangular shape with both ends being triangular, and a protrusion 20a that positions the permanent magnet 18 is provided on the inner diameter side oblique side of the triangle. After inserting the permanent magnet 18 which is opposed to the projecting portion 15 a and is alternately magnetized with the N pole and the S pole, the resin is injected to fix the permanent magnet 18. A flat portion 25 is formed on the outer peripheral surface of the rotor core 20 between the adjacent permanent magnets 18. The plane portion 25 is formed from a tangent line where a plane extending in the direction of the stator 15 from the end surface adjacent to the permanent magnet 18b of the permanent magnet 18a and the outer peripheral surface of the rotor core 20 and an end surface of the adjacent permanent magnet 18b on the permanent magnet 18a side. It extends to the tangent line where the plane extending in the direction of the stator 15 and the outer peripheral surface of the rotor core 20 intersect. Similarly, the flat portion 25 is also formed between the permanent magnet 18b and the permanent magnet 18c, between the permanent magnet 18c and the permanent magnet 18d, and between the permanent magnet 18d and the permanent magnet 18a. Since the flat portion 25 is formed, the gap 25 is larger than the gap between the outer peripheral surface of the rotor core 20 facing the permanent magnet 18 and the inner peripheral surface of the stator 15. The triangular outer diameter side hypotenuse forms a narrow linear magnetic path 22 with the flat portion 25.

次に、製造時に意図せず残留し、冷却水中に混入した磁性体異物の吸着について、図２及び図３に基づいて説明する。   Next, the adsorption of magnetic foreign substances that remain unintentionally at the time of manufacture and are mixed in the cooling water will be described with reference to FIGS.

一般に、空気中や水中の透磁率よりも、磁性材料であるロータコア２０の透磁率の方が高く、磁束は透磁率の高いロータコア２０内を流れようとする。ロータコア２０の外周面側をＮ極とする永久磁石１８ａの磁極両端部からの磁束は、ロータコア２０の磁路２２を通じて隣り合うロータコア２０の外周面側をＳ極とする永久磁石１８ｂ及び永久磁石１８ｄへと流れていく。磁路２２は幅が狭いため磁束密度が高くなり磁力が強く、永久磁石１８ａと永久磁石１８ｂとの間と、永久磁石１８ａと永久磁石１８ｄとの間に形成された平面部２５に、磁性体異物を吸着することができる。回転子１２が回転しても吸着された磁性体異物は、永久磁石１８の磁力（磁性体異物の吸着力）により、平面部２５の外部へ出ることが抑制される。その結果、ロータコア２０の外周面と固定子１５の内周面との間に異物が入り込むことを抑制できる。   In general, the magnetic permeability of the rotor core 20 that is a magnetic material is higher than the magnetic permeability in air or water, and the magnetic flux tends to flow through the rotor core 20 having a high magnetic permeability. The magnetic flux from both ends of the magnetic poles of the permanent magnet 18a having the N-pole on the outer peripheral surface side of the rotor core 20 is a permanent magnet 18b and permanent magnet 18d having the S-pole on the outer peripheral surface side of the adjacent rotor core 20 through the magnetic path 22 of the rotor core 20. It flows to. Since the magnetic path 22 is narrow, the magnetic flux density is high and the magnetic force is strong, and a magnetic material is formed between the permanent magnet 18a and the permanent magnet 18b and the flat portion 25 formed between the permanent magnet 18a and the permanent magnet 18d. Foreign matter can be adsorbed. Even if the rotor 12 rotates, the magnetic foreign matter attracted by the permanent magnet 18 is prevented from coming out of the flat portion 25 due to the magnetic force of the permanent magnet 18 (adsorption force of the magnetic foreign matter). As a result, foreign matter can be prevented from entering between the outer peripheral surface of the rotor core 20 and the inner peripheral surface of the stator 15.

次に電動ウォータポンプ１０の作動について図１及び図２に基づいて説明する。   Next, the operation of the electric water pump 10 will be described with reference to FIGS. 1 and 2.

図示しないラジエータ或いはエンジンに冷却水を流すときには、通電制御装置２４によって各コイル１５ｃへの通電が制御される。例えば所定のコイル１５ｃに電流を流して所定の突出部１５ａに磁極を形成すると、永久磁石１８との間に磁気吸引力が働いて回転子１２が回転する。このとき、他のコイル１５ｃに逆方向に電流を流して他の突出部１５ａに磁極を形成しておけば、突出部１５ａと永久磁石１８との間に磁気反発力が働いて回転子１２の回転が促進される。次に、各コイル１５ｃに流れる電流をそれぞれ逆方向に切替えると、永久磁石１８との間の磁気吸引力及び磁気反発力も切り替わって回転子１２が更に回転する。このように、通電制御装置２４により各コイル１５ｃへの通電を切替え制御することによって、回転子１２の回転を任意に制御することが可能になる。例えば、各コイル１５ｃに流れる電流の大きさを制御すると突出部１５ａと永久磁石１８との間で働く磁気吸引力及び磁気反発力の大きさが制御されて任意の回転トルクを得ることができ、各コイル１５ｃへの通電の切替え速度を制御すると任意の回転速度を得ることができる。このように、回転子１２が回転することで、回転子１２の先端に設けられたインペラ１１も回転して、低圧側となる吸入口１６ａから冷却水を吸入するとともに高圧側となる吐出口１６ｂへと冷却水を吐出する。吐出口１６ｂから吐出された冷却水は、エンジン或いはラジエータ内を流れてエンジンを冷却する。   When flowing cooling water through a radiator or an engine (not shown), the energization control device 24 controls energization of each coil 15c. For example, when a current is passed through the predetermined coil 15 c to form a magnetic pole in the predetermined protrusion 15 a, the rotor 12 rotates due to a magnetic attraction force acting between the permanent magnet 18. At this time, if a current is passed through the other coil 15c in the opposite direction to form a magnetic pole in the other protrusion 15a, a magnetic repulsive force acts between the protrusion 15a and the permanent magnet 18 and the rotor 12 Rotation is promoted. Next, when the current flowing through each coil 15c is switched in the opposite direction, the magnetic attractive force and the magnetic repulsive force with the permanent magnet 18 are also switched, and the rotor 12 further rotates. As described above, the energization control device 24 switches and controls the energization of each coil 15c, whereby the rotation of the rotor 12 can be arbitrarily controlled. For example, when the magnitude of the current flowing through each coil 15c is controlled, the magnitude of the magnetic attractive force and the magnetic repulsive force acting between the protruding portion 15a and the permanent magnet 18 can be controlled to obtain an arbitrary rotational torque. An arbitrary rotation speed can be obtained by controlling the switching speed of energization to each coil 15c. Thus, when the rotor 12 rotates, the impeller 11 provided at the tip of the rotor 12 also rotates, and the cooling water is sucked from the suction port 16a on the low pressure side and the discharge port 16b on the high pressure side. Discharge cooling water to The cooling water discharged from the discharge port 16b flows through the engine or the radiator to cool the engine.

尚、本実施形態は、永久磁石１８を正方形状に４個配列した場合を説明したが、これに限定されることなく、永久磁石１８は複数設ければ良く、どんな配列でも良い。更に本実施形態は、回転子１２の内部に設けられ隣り合う永久磁石１８の間の回転子１２の外周面全てに平面部２５を形成したが、平面部２５は少なくとも１つ形成すれば良い。   In the present embodiment, the case where four permanent magnets 18 are arranged in a square shape has been described. However, the present invention is not limited to this, and a plurality of permanent magnets 18 may be provided, and any arrangement may be used. Furthermore, in the present embodiment, the flat portion 25 is formed on the entire outer peripheral surface of the rotor 12 between the adjacent permanent magnets 18 provided inside the rotor 12, but at least one flat portion 25 may be formed.

本発明の実施形態に係る電動ウォータポンプの断面図であり、図２におけるＡ−Ｏ−Ａ断面図である。It is sectional drawing of the electric water pump which concerns on embodiment of this invention, and is AOA sectional drawing in FIG. 図１におけるＢ−Ｂ断面図である。It is BB sectional drawing in FIG. 本発明の実施形態に係るロータコアの断面図である。It is sectional drawing of the rotor core which concerns on embodiment of this invention.

符号の説明Explanation of symbols

１０・・・電動ウォータポンプ
１１・・・インペラ
１２・・・回転子
１２ａ・・・貫通孔
１３・・・軸
１４・・・ボディ（ハウジング）
１５・・・固定子
１５ａ・・・突出部
１５ｂ・・・コア
１５ｃ・・・コイル
１６・・・ハウジング（ハウジング）
１６ａ・・・吸入口
１６ｂ・・・排出口
１６ｃ・・・ボス部
１７・・・孔
１８・・・永久磁石
１８ａ・・・永久磁石（第１永久磁石）
１８ｂ・・・永久磁石（第２永久磁石）
１８ｃ・・・永久磁石
１８ｄ・・・永久磁石
１９・・・広隙部
２０・・・ロータコア
２１・・・穴部
２１ａ・・・穴部
２１ｂ・・・穴部
２１ｃ・・・穴部
２１ｄ・・・穴部
２２・・・磁路
２５・・・平面部 DESCRIPTION OF SYMBOLS 10 ... Electric water pump 11 ... Impeller 12 ... Rotor 12a ... Through-hole 13 ... Shaft 14 ... Body (housing)
15 ... Stator 15a ... Projection 15b ... Core 15c ... Coil 16 ... Housing (housing)
16a ... suction port 16b ... discharge port 16c ... boss 17 ... hole 18 ... permanent magnet 18a ... permanent magnet (first permanent magnet)
18b ... permanent magnet (second permanent magnet)
18c ... permanent magnet 18d ... permanent magnet 19 ... wide gap 20 ... rotor core 21 ... hole 21a ... hole 21b ... hole 21c ... hole 21d ..Hole part 22 ... Magnetic path 25 ... Plane part

Claims (4)

吸入口と吐出口とを有するハウジングと、
前記ハウジングの中に設けられ、前記吸入口から前記吐出口へと冷却水を送り込むインペラと、
前記ハウジング内に回転自在に設けられるとともに、一端には前記インペラが設けられ、他端には円柱部の穴部に複数の永久磁石が設けられた回転子と、
前記回転子の周りに位置するよう前記ハウジングの内周に固設されるとともに、前記回転子に向けて突出する複数の突出部を持つコアと、前記コアに巻回されるコイルとを有する固定子と、を備え、
前記永久磁石と対向する前記回転子の外周面と前記固定子の内周面との間隙よりも、隣り合う前記永久磁石の間の前記回転子の外周面と前記固定子との間隙を大とするように、隣り合う前記永久磁石の間の前記回転子の外周面に平面部を少なくとも１つ以上形成し、
前記穴部は、前記永久磁石が挿入される主穴部及び前記永久磁石を前記円柱部に固定する樹脂が注入される副穴部を有し、
前記永久磁石の前記固定子と対向する面から発生する磁束が、隣り合う前記永久磁石の前記固定子と対向する面へと流れる磁路を形成し、
前記平面部と前記副穴部とで直線状の前記磁路を形成している電動ウォータポンプ。 A housing having a suction port and a discharge port;
An impeller provided in the housing and for feeding cooling water from the suction port to the discharge port;
A rotor provided rotatably in the housing, provided with the impeller at one end, and provided with a plurality of permanent magnets in the hole of the cylindrical portion at the other end ,
A fixed member fixed to the inner periphery of the housing so as to be positioned around the rotor and having a core having a plurality of protrusions protruding toward the rotor, and a coil wound around the core. With children,
The gap between the outer peripheral surface of the rotor and the stator between the adjacent permanent magnets is larger than the gap between the outer peripheral surface of the rotor facing the permanent magnet and the inner peripheral surface of the stator. So as to form at least one plane portion on the outer peripheral surface of the rotor between the adjacent permanent magnets ,
The hole portion has a main hole portion into which the permanent magnet is inserted and a sub-hole portion into which resin for fixing the permanent magnet to the cylindrical portion is injected,
Magnetic flux generated from the surface of the permanent magnet facing the stator forms a magnetic path that flows to the surface of the adjacent permanent magnet facing the stator,
The electric water pump which forms the said linear magnetic path with the said plane part and the said subhole part . 吸入口と吐出口とを有するハウジングと、
前記ハウジングの中に設けられ、前記吸入口から前記吐出口へと冷却水を送り込むインペラと、
前記ハウジング内に回転自在に設けられるとともに、一端には前記インペラが設けられ、他端には円柱部の第１穴部に第１永久磁石が設けられ且つ前記円柱部の第２穴部に第２永久磁石が設けられた回転子と、
前記回転子の周りに位置するよう前記ハウジングの内周に固設されるとともに、前記回転子に向けて突出する複数の突出部を持つコアと、前記コアに巻回されるコイルとを有する固定子と、を備え、
前記第１永久磁石及び前記第２永久磁石と対向する前記回転子の外周面と前記固定子の内周面との間隙よりも、前記第１永久磁石と前記第２永久磁石との間の前記回転子の外周面と前記固定子との間隙を大とするように、前記第１永久磁石と前記第２永久磁石との間の前記回転子の外周面に平面部を形成し、
前記第１穴部は、前記第１永久磁石が挿入される第１主穴部、及び前記第１永久磁石を前記円柱部に固定する樹脂が注入される第１副穴部を有し、
前記第２穴部は、前記第２永久磁石が挿入される第２主穴部、及び前記第２永久磁石を前記円柱部に固定する樹脂が注入される第２副穴部を有し、
前記第１永久磁石の前記固定子と対向する面から発生する磁束が、前記第２永久磁石の前記固定子と対向する面へと流れる磁路を形成し、
前記平面部と前記第１副穴部及び前記第２副穴部とに挟まれて直線状の前記磁路を形成している電動ウォータポンプ。 A housing having a suction port and a discharge port;
An impeller provided in the housing and for feeding cooling water from the suction port to the discharge port;
Together provided rotatably in the housing, the impeller is provided at one end, first the second hole portion of and the cylindrical portion first permanent magnet is provided in the first bore portion of the cylindrical portion to the other end 2 a rotor provided with permanent magnets ;
A fixed member fixed to the inner periphery of the housing so as to be positioned around the rotor and having a core having a plurality of protrusions protruding toward the rotor, and a coil wound around the core. With children,
The gap between the first permanent magnet and the second permanent magnet is larger than the gap between the outer peripheral surface of the rotor and the inner peripheral surface of the stator facing the first permanent magnet and the second permanent magnet. Forming a flat portion on the outer peripheral surface of the rotor between the first permanent magnet and the second permanent magnet so as to increase the gap between the outer peripheral surface of the rotor and the stator ;
The first hole portion includes a first main hole portion into which the first permanent magnet is inserted, and a first sub hole portion into which resin for fixing the first permanent magnet to the column portion is injected,
The second hole portion has a second main hole portion into which the second permanent magnet is inserted, and a second sub hole portion into which resin for fixing the second permanent magnet to the cylindrical portion is injected,
Magnetic flux generated from the surface of the first permanent magnet facing the stator forms a magnetic path that flows to the surface of the second permanent magnet facing the stator,
An electric water pump sandwiched between the flat portion, the first sub-hole portion, and the second sub-hole portion to form the linear magnetic path . 前記磁路の延在方向と前記平面部の延在方向とは平行である請求項１または２に記載の電動ウォータポンプ。The electric water pump according to claim 1 or 2, wherein an extending direction of the magnetic path and an extending direction of the planar portion are parallel to each other. 前記副穴部は、前記平面部と対向する副穴平面部を備える請求項１に記載の電動ウォータポンプ。The electric water pump according to claim 1, wherein the sub-hole portion includes a sub-hole flat portion facing the flat portion.
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