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JP5969902B2 - Motor cooling device - Google Patents

Motor cooling device Download PDF

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JP5969902B2
JP5969902B2 JP2012254206A JP2012254206A JP5969902B2 JP 5969902 B2 JP5969902 B2 JP 5969902B2 JP 2012254206 A JP2012254206 A JP 2012254206A JP 2012254206 A JP2012254206 A JP 2012254206A JP 5969902 B2 JP5969902 B2 JP 5969902B2
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steel plate
steel
slit
cooling device
slits
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JP2014103770A (en
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吉野　靖
靖 吉野
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T.RAD CO., L T D.
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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Description

本発明は、モータの固定子をその内部から冷却するモータ冷却装置に関する。   The present invention relates to a motor cooling device that cools a stator of a motor from the inside thereof.

下記特許文献１に記載の電気自動車用モータおよびその冷却方法が提案されている。これは、固定子を形成する積層鋼板の積層方向に複数の孔を穿設し、そこに冷媒を流通させ、固定子のコイルの通電に基づく発熱を吸収するものである。   The electric vehicle motor and its cooling method described in Patent Document 1 below have been proposed. In this method, a plurality of holes are formed in the stacking direction of the laminated steel sheets forming the stator, and a refrigerant is circulated therein to absorb heat generated by energization of the stator coils.

特開平９−４６９７２号公報Japanese Patent Laid-Open No. 9-46972

上記特許文献１に記載の冷却方法は、固定子を構成する積層鋼板の積層方向に複数の貫通孔を設け、その貫通孔に冷媒を流通させるものである。そのため、冷媒の接触する放熱面積が極めて小さく、冷却効果があまり期待できない欠点があった。
そこで、本発明は、冷媒が接触する流路面積を可及的に広くした、冷却効果の高いモータの冷却装置を提供することを課題とする。 In the cooling method described in Patent Document 1, a plurality of through holes are provided in the stacking direction of the laminated steel plates constituting the stator, and the refrigerant is circulated through the through holes. For this reason, there is a drawback that the heat radiation area in contact with the refrigerant is extremely small and the cooling effect cannot be expected so much.
Accordingly, an object of the present invention is to provide a motor cooling device with a high cooling effect, in which a flow path area in contact with a refrigerant is made as wide as possible.

請求項１に記載の本発明は、積層鋼板により固定子（１）が形成され、その各鋼板（２）は、それぞれ外周が整合すると共に、複数の突出部（３）が放射状に設けられ、その積層鋼板の前記突出部（３）が電磁極（４）を形成し、その各電磁極（４）の外周に磁極形成用のコイル（５）が巻回されたモータ冷却装置において、
その積層鋼板は、第１鋼板（２ａ）と第２鋼板（２ｂ）とを有し、第１鋼板（２ａ）と第２鋼板（２ｂ）とは互いに冷媒の出入口を形成する一対の連通部（６）（７）で積層方向に連通され、
第１鋼板（２ａ）は各突出部（３）の平面に放射方向にスリット（８）が形成され、そのスリット（８）に前記連通部（６）（７）が連通され、
その第１鋼板（２ａ）のスリット（８）に整合する位置で、第２鋼板（２ｂ）の平面は平坦に形成され、
冷媒が前記連通部（６）（７）を介して各第１鋼板（２ａ）のスリット（８）に供給されるように形成され、
第１鋼板（２ａ）と第２鋼板（２ｂ）との両者に前記スリット（８）が形成されると共に、両鋼板（２ａ）（２ｂ）の各スリット（８）の位置は積層方向に重ならないように位置ずれして配置されたモータ冷却装置である。 According to the first aspect of the present invention, the stator (1) is formed of laminated steel plates, and each of the steel plates (2) is provided with a plurality of protrusions (3) radially aligned with the outer periphery thereof, In the motor cooling device in which the protruding portion (3) of the laminated steel plate forms an electromagnetic pole (4), and a magnetic pole forming coil (5) is wound around the outer circumference of each electromagnetic pole (4).
The laminated steel plate includes a first steel plate (2a) and a second steel plate (2b), and the first steel plate (2a) and the second steel plate (2b) form a pair of communicating portions that form a refrigerant inlet / outlet ( 6) communicated in the stacking direction in (7),
In the first steel plate (2a), slits (8) are formed in the radial direction on the plane of each protrusion (3), and the communication portions (6) and (7) are communicated with the slits (8).
At the position aligned with the slit (8) of the first steel plate (2a), the plane of the second steel plate (2b) is formed flat,
The refrigerant is formed to be supplied to the slits (8) of the first steel plates (2a) through the communication portions (6) and (7),
The slit (8) is formed in both the first steel plate (2a) and the second steel plate (2b), and the positions of the slits (8) of the steel plates (2a) and (2b) do not overlap in the stacking direction. In this way, the motor cooling device is arranged so as to be displaced .

請求項２に記載の本発明は、請求項１に記載のモータ冷却装置において、
第１鋼板（２ａ）と第２鋼板（２ｂ）とが交互に積層されたモータ冷却装置である。 According to a second aspect of the present invention, in the motor cooling device according to the first aspect,
A motor cooling device in which the first steel plate (2a) and the second steel plate (2b) are alternately stacked .

本発明は、その第１鋼板2aの各突出部３の平面に放射方向にスリット８が形成され、その第１鋼板2aのスリット８に整合する位置で、第２鋼板2bの平面は平坦に形成され、冷媒が連通部６，７を介して各第１鋼板2aのスリット８に供給されるものである。このとき第２鋼板がスリット２の上下両面を閉塞して偏平な冷媒通路を平面方向に形成する。
すると、平面方向へスリット８の形状の偏平な流路が形成され、このような流路が積層方向に多数並列し、冷媒の接触面積が大きくなる。そのスリット８を介して冷媒を放射方向に供給するため、効果的に固定子を冷却することができる。そのスリット８は、磁力線が集中し、発熱の特に大きな電極を形成する第１プレート2aの突出部３にあるため、固定子１をより効果的に冷却することができる。 In the present invention, a slit 8 is formed in the radial direction on the plane of each protrusion 3 of the first steel plate 2a, and the plane of the second steel plate 2b is formed flat at a position aligned with the slit 8 of the first steel plate 2a. Then, the refrigerant is supplied to the slits 8 of the first steel plates 2a via the communication portions 6 and 7. At this time, the second steel plate closes both the upper and lower surfaces of the slit 2 to form a flat refrigerant passage in the plane direction.
Then, a flat flow path having the shape of the slit 8 is formed in the plane direction, and a large number of such flow paths are arranged in parallel in the stacking direction, so that the contact area of the refrigerant is increased. Since the refrigerant is supplied in the radial direction through the slit 8, the stator can be effectively cooled. Since the slit 8 is in the protruding portion 3 of the first plate 2a where the magnetic lines of force are concentrated and an electrode that generates particularly large heat is generated, the stator 1 can be cooled more effectively.

さらに、第１鋼板2aと第２鋼板2bとの両者に前記スリット８が形成されると共に、両鋼板2a，2bの各スリット８の位置は積層方向に重ならないように位置ずれして配置されたものである。そのため、さらに効果的に固定子１の発熱を吸熱することができる。 Further, the slits 8 are formed in both the first steel plate 2a and the second steel plate 2b, and the positions of the slits 8 in both the steel plates 2a and 2b are arranged so as not to overlap in the stacking direction. Is. Therefore, the heat generated by the stator 1 can be absorbed more effectively.

請求項２に記載の発明は、上記構成に加えて、第１鋼板2aと第２鋼板2bとが交互に積層されたものである。そのためスリット８を少なくとも一枚おきの鋼板に形成して、冷媒19の流路を積層方向により多く並列し、効果的に固定子１を冷却することができる。 The invention according to claim 2 is such that, in addition to the above configuration , the first steel plates 2a and the second steel plates 2b are alternately laminated. Therefore, the slits 8 can be formed in at least every other steel plate, and the flow paths of the refrigerant 19 can be arranged more in parallel in the stacking direction, thereby effectively cooling the stator 1.

本発明の固定子を形成する第１鋼板2aの平面図。The top view of the 1st steel plate 2a which forms the stator of this invention. 同第２鋼板2bの平面図。The top view of the 2nd steel plate 2b. 同固定子の分解斜視図。The disassembled perspective view of the stator. 図３のIV−IV矢視断面略図。FIG. 4 is a schematic sectional view taken along the line IV-IV in FIG. 3. 同モータを説明する平面図。The top view explaining the motor. 図５におけるVI−VI矢視断面略図。VI-VI arrow cross-sectional schematic in FIG. 本発明の第２実施例の第１鋼板2aの平面図。The top view of the 1st steel plate 2a of 2nd Example of this invention. 同第２鋼板2bの平面図。The top view of the 2nd steel plate 2b. 本発明の第３実施例の第１鋼板2aの平面図。The top view of the 1st steel plate 2a of 3rd Example of this invention. 同第２鋼板2bの平面図。The top view of the 2nd steel plate 2b. 同端板16の平面図。FIG. 3 is a plan view of the end plate 16. 図10のXII−XII矢視断面図。FIG. 11 is a cross-sectional view taken along arrow XII-XII in FIG. 本発明の第４実施例の第１鋼板2aの平面図。The top view of the 1st steel plate 2a of 4th Example of this invention. 同第２鋼板2bの平面図。The top view of the 2nd steel plate 2b.

次に、図面に基づいて、本発明の実施の形態について説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１〜図６、図９〜図１２、図１３、図１４は参考例を示し、図７、図８が本発明の実施例を示す。
このモータは図５に示す如く、その中心に固定子１が存在し、その外周に回転子10が配置されるものである。その固定子１は、図３及び図５に示す積層鋼板とその突出部３に巻回された磁極形成用の電磁コイル５とからなる。積層鋼板は、互いに外周が整合する図１の第１鋼板2aと、図２の第２鋼板2bとの積層体からなる。この例では第１鋼板2aと第２鋼板2bが交互に配置されている。第１鋼板2a及び第２鋼板2bの平面形状は、この例では、中心から放射方向に６つの突出部３が突設されている。 1 to 6, 9 to 12, 13, and 14 show a reference example, and FIGS. 7 and 8 show an embodiment of the present invention.
As shown in FIG. 5, this motor has a stator 1 at its center and a rotor 10 disposed on the outer periphery thereof. The stator 1 includes a laminated steel plate shown in FIGS. 3 and 5 and an electromagnetic coil 5 for forming a magnetic pole wound around the protruding portion 3. The laminated steel plate is composed of a laminate of the first steel plate 2a in FIG. 1 and the second steel plate 2b in FIG. In this example, the first steel plates 2a and the second steel plates 2b are alternately arranged. In this example, the planar shape of the first steel plate 2a and the second steel plate 2b is such that six projecting portions 3 project from the center in the radial direction.

そして、第１鋼板2a、第２鋼板2bにはそれぞれ互いに整合する位置に一対づつの連通部６，７が設けられている。
さらに、第１鋼板2aは図１に示すごとく、一方の連通部６から他方の連通孔７に向け、各突出部３の平面にそれをＵ字状に貫通するスリット８が星型に形成されている。そのスリット８は一筆書きからなり、その一端と他端とは離間している。これは、第１鋼板2aをプレス成形により、一体的に形成するとき、各部が分離しないようにするためである。そして、このスリット８はそれぞれの突出部３の外周に沿って形成されている。 The first steel plate 2a and the second steel plate 2b are provided with a pair of communication portions 6 and 7 at positions aligned with each other.
Further, as shown in FIG. 1, the first steel plate 2a is formed in a star shape with slits 8 penetrating from the one communicating portion 6 to the other communicating hole 7 in the plane of each protruding portion 3 in a U shape. ing. The slit 8 consists of a single stroke, and one end and the other end are separated from each other. This is to prevent the parts from separating when the first steel plate 2a is integrally formed by press forming. And this slit 8 is formed along the outer periphery of each protrusion part 3. As shown in FIG.

次に、第２鋼板2bにはスリット８が存在せず、孔よりなる連通部６，７のみが存在する。
このようにしてなる第１鋼板2aと第２鋼板2bは、それらが交互に配置されて、積層鋼板を形成する。そして、図５において、その積層鋼板の上下両端のプレートは、各鋼板の一対の連通部６，７間を連通する図示しない連通路が形成されている。また、図４において、図示しない最下端の鋼板の端蓋は、一対の連通部６，７に接続される一対の出入口パイプ18が設けられている。
そして、積層鋼板の各突出部３に電磁極４が形成され、その外周に磁極形成用の電磁コイル５が巻回されている。第１鋼板2aと第２鋼板2bとの間は冷媒がもれないように、シールされている。シールの手段としては、電気絶縁性のシール材、接着剤、ゴム材、Ｏリング、その他が利用できる。 Next, the slit 8 is not present in the second steel plate 2b, and only the communication portions 6 and 7 made of holes are present.
The first steel plate 2a and the second steel plate 2b thus formed are alternately arranged to form a laminated steel plate. In FIG. 5, the upper and lower plates of the laminated steel plate are formed with a communication path (not shown) that communicates between the pair of communication portions 6 and 7 of each steel plate. In FIG. 4, the end cover of the lowermost steel plate (not shown) is provided with a pair of inlet / outlet pipes 18 connected to the pair of communication portions 6, 7.
And the electromagnetic pole 4 is formed in each protrusion part 3 of a laminated steel plate, and the electromagnetic coil 5 for magnetic pole formation is wound around the outer periphery. The first steel plate 2a and the second steel plate 2b are sealed so that no refrigerant can escape. As a sealing means, an electrically insulating sealing material, an adhesive, a rubber material, an O-ring, or the like can be used.

このようにしてなる固定子１は、図６に示す如く、ベース12に固定され、それを貫通する一対の出入口パイプ18が各連通部６，７を介して第１鋼板2aのスリット８と連通する。そして、ベース12の中心には、ベアリング15を介して回転軸13が貫通する。そして、回転軸13の一端に有底筒状の回転子10が固定され、その内周面に複数の永久磁石９が配置されている。この回転子10の各永久磁石９間には図５に示す如く、磁気センサー11が配置されている。この磁気センサー11は、回転子10の磁極を検出し、その検出信号に基づき固定子１の電磁極４の極性を制御し、回転子10を連続的に回転させるものである。   As shown in FIG. 6, the stator 1 thus formed is fixed to a base 12, and a pair of inlet / outlet pipes 18 penetrating the base 12 communicates with the slits 8 of the first steel plate 2a through the communication portions 6 and 7, respectively. To do. The rotating shaft 13 passes through the center of the base 12 via a bearing 15. And the bottomed cylindrical rotor 10 is fixed to one end of the rotating shaft 13, and the some permanent magnet 9 is arrange | positioned at the internal peripheral surface. A magnetic sensor 11 is arranged between the permanent magnets 9 of the rotor 10 as shown in FIG. This magnetic sensor 11 detects the magnetic pole of the rotor 10, controls the polarity of the electromagnetic pole 4 of the stator 1 based on the detection signal, and rotates the rotor 10 continuously.

（作用）
次に、本発明のモータ冷却装置の冷却作用につき説明する。
図６において、入口側の出入口パイプ18から連通部６を介して各第１鋼板2aの各スリット８に冷媒19（一例として冷却水）が導かれ、それが図１に示すスリット８の流路に沿って、星型に且つ、蛇行状に流通し、他方の連通部７から出入口パイプ18を介し、ベース12の下方に流出する。そして、固定子１の電磁コイル５の電流によって電磁極４に誘導磁界が生じ、それに基づく各鋼板のヒステリシス損によって生じる発熱は、第１鋼板2aのスリット８に流通する冷媒19によって吸熱される。特に、スリット８は突出部３の外周に沿ってＵ字状に流通するため、最も発熱の激しい突出部３を効果的に冷却することができる。 (Function)
Next, the cooling action of the motor cooling device of the present invention will be described.
In FIG. 6, a refrigerant 19 (cooling water as an example) is guided from the inlet / outlet pipe 18 to each slit 8 of each first steel plate 2a through the communicating portion 6, and this is the flow path of the slit 8 shown in FIG. , In a star shape and in a meandering manner, flows out from the other communication portion 7 to the lower side of the base 12 via the inlet / outlet pipe 18. Then, an induction magnetic field is generated in the electromagnetic pole 4 due to the current of the electromagnetic coil 5 of the stator 1, and the heat generated by the hysteresis loss of each steel plate based on the induced magnetic field is absorbed by the refrigerant 19 flowing through the slit 8 of the first steel plate 2 a. In particular, since the slit 8 circulates in a U shape along the outer periphery of the protrusion 3, the protrusion 3 with the most heat generation can be effectively cooled.

次に、図７及び図８は、第１鋼板2aと第２鋼板2bの実施例であり、この例が前記参考例と異なる点は、第２鋼板2bにもスリット８が形成され、その第１鋼板2aのスリット８と第２鋼板2bのスリット８とが互いに重ならないように配置された点である。したがって、冷媒は第１鋼板2aにも第２鋼板2bにも流通する。 Next, FIG. 7 and FIG. 8 are examples of the first steel plate 2a and the second steel plate 2b. The difference between this example and the reference example is that the second steel plate 2b is also provided with a slit 8, The slit 8 of the first steel plate 2a and the slit 8 of the second steel plate 2b are arranged so as not to overlap each other. Accordingly, the refrigerant flows through both the first steel plate 2a and the second steel plate 2b.

次に、図９〜図12は参考例であり、この例は各第１鋼板2aの突出部３にそれぞれ一対づつの連通部６と連通部７とが配置され、それらの間をスリット８がＵ字状に連通している。そして、それぞれの連通部６、連通部７に整合する位置で、第２鋼板2bには連通部６と連通部７が配置されている。半径方向の内側の各連通部７は、同心円上に配置され、その外側の連通部６も同心円上に配置されている。そして、図11、図12に示すごとく、積層方向の上端には端板16が配置されている。 Next, FIG. 9 to FIG. 12 are reference examples . In this example, a pair of communication portions 6 and a communication portion 7 are arranged on the protruding portion 3 of each first steel plate 2a, and a slit 8 is provided between them. It communicates in a U shape. And the communication part 6 and the communication part 7 are arrange | positioned in the 2nd steel plate 2b in the position aligned with each communication part 6 and the communication part 7. FIG. Each communication portion 7 on the inner side in the radial direction is disposed on a concentric circle, and the outer communication portion 6 is also disposed on the concentric circle. As shown in FIGS. 11 and 12, an end plate 16 is disposed at the upper end in the stacking direction.

この端板16は、半径方向の外側の連通部６に整合する位置と、内側の連通部７に整合する位置とにそれぞれ環状溝17が設けられ、各連通部６間及び、各連通部７間を互いに連通する。そして、一対の出入口パイプ18が内側の環状溝17と外側の環状溝17とに連通され、一方の出入口パイプ18から外側の各連通部６に冷媒が供給され、内側の各連通部７から他方の出入口パイプ18に導かれる。なお、端板16は固定子１の積層方向の上下両端に配置され、一方の端板16には出入口パイプ18が設けられていない。   The end plate 16 is provided with annular grooves 17 at positions aligned with the radially outer communication portions 6 and positions aligned with the inner communication portions 7, and between the communication portions 6 and between the communication portions 7. Communicate with each other. The pair of inlet / outlet pipes 18 communicates with the inner annular groove 17 and the outer annular groove 17, and the refrigerant is supplied from one inlet / outlet pipe 18 to each of the outer communicating portions 6. The doorway 18 is led to. Note that the end plates 16 are disposed at both upper and lower ends in the stacking direction of the stator 1, and one end plate 16 is not provided with the inlet / outlet pipe 18.

次に、図13及び図14は参考例であり、この例はモータの外周側が固定子である。その固定子を形成する第１鋼板2a、第２鋼板2bには複数の突出部３が放射方向中心側に突設されている。そして、第１鋼板2a、第２鋼板2bにそれぞれ連通部６、連通部７が穿設され、連通部６と連通部７間をスリット８によって連結している。スリット８は、第１鋼板2aの各突出部３の外周に沿ってＵ字状に形成されるとともに、各突出部３間を連通している。 Next, FIGS. 13 and 14 are reference examples . In this example, the outer peripheral side of the motor is a stator. A plurality of projecting portions 3 project from the first steel plate 2a and the second steel plate 2b forming the stator toward the center in the radial direction. The first steel plate 2 a and the second steel plate 2 b are respectively provided with a communication portion 6 and a communication portion 7, and the communication portion 6 and the communication portion 7 are connected by a slit 8. The slit 8 is formed in a U shape along the outer periphery of each protrusion 3 of the first steel plate 2a, and communicates between the protrusions 3.

次に、第２鋼板2bにはこの例ではスリット８が配置されていない。そして、一例として、第１鋼板2aと第２鋼板2bとを交互に積層して、固定子１を形成する。固定子の各突出部の外周には図示しない電磁コイルが巻回される。そして、その固定子の内側に回転子10が配置される。
なお、各、参考例および実施例において、各鋼板の連通部６、連通部７は絶縁性の被膜が塗布され、積層方向に渦電流が通電するのを防止している。また、各鋼板の両面には公知の絶縁被膜が被覆され、積層鋼板は互いに図示しないボルト等により締結され、冷媒の漏れを防止している。 Next, the slit 8 is not arrange | positioned in this example at the 2nd steel plate 2b. And as an example, the 1st steel plate 2a and the 2nd steel plate 2b are laminated | stacked alternately, and the stator 1 is formed. An electromagnetic coil (not shown) is wound around the outer periphery of each protrusion of the stator. And the rotor 10 is arrange | positioned inside the stator.
In each of the reference examples and examples , each of the communicating portions 6 and 7 of each steel plate is coated with an insulating coating to prevent eddy current from flowing in the stacking direction. Moreover, a known insulating coating is coated on both surfaces of each steel plate, and the laminated steel plates are fastened with bolts or the like (not shown) to prevent refrigerant leakage.

（他の実施の形態）
上記実施例では、第１鋼板2aと第２鋼板2bとを交互に配置したが、それに替えて２枚おきに第２鋼板2bを配置してもよい。その場合は、スリット８の流路断面積を大きくすることができる。
逆に、２枚ごとの第２鋼板2bの間に第１鋼板2aを１つ配置してもよい。あるいはそれらを３枚ごと、さらには複数枚ごとに第１鋼板2aと第２鋼板2bを配置することも可能である。それらはモータの発熱量その他の条件に応じて適宜選択することができる。 (Other embodiments)
In the said Example, although the 1st steel plate 2a and the 2nd steel plate 2b were arrange | positioned alternately, you may arrange | position the 2nd steel plate 2b every 2 sheets instead. In that case, the channel cross-sectional area of the slit 8 can be increased.
Conversely, one first steel plate 2a may be disposed between every two second steel plates 2b. Alternatively, it is possible to arrange the first steel plate 2a and the second steel plate 2b for every three sheets or for every plurality of them. They can be appropriately selected according to the amount of heat generated by the motor and other conditions.

１ 固定子
２ 鋼板
2a 第１鋼板
2b 第２鋼板
３ 突出部
４ 電磁極
５ 電気コイル
６ 連通部
７ 連通部
８ スリット
９ 永久磁石 1 Stator 2 Steel plate
2a First steel plate
2b 2nd steel plate 3 Protruding part 4 Electromagnetic pole 5 Electric coil 6 Communication part 7 Communication part 8 Slit 9 Permanent magnet

10 回転子
11 磁気センサー
12 ベース
13 回転軸
15 ベアリング
16 端板
17 環状溝
18 出入口パイプ
19 冷媒 10 rotor
11 Magnetic sensor
12 base
13 Rotating axis
15 Bearing
16 End plate
17 Annular groove
18 Entrance pipe
19 Refrigerant

Claims (2)

積層鋼板により固定子（１）が形成され、その各鋼板（２）は、それぞれ外周が整合すると共に、複数の突出部（３）が放射状に設けられ、その積層鋼板の前記突出部（３）が電磁極（４）を形成し、その各電磁極（４）の外周に磁極形成用のコイル（５）が巻回されたモータ冷却装置において、
その積層鋼板は、第１鋼板（２ａ）と第２鋼板（２ｂ）とを有し、第１鋼板（２ａ）と第２鋼板（２ｂ）とは互いに冷媒の出入口を形成する一対の連通部（６）（７）で積層方向に連通され、
第１鋼板（２ａ）は各突出部（３）の平面に放射方向にスリット（８）が形成され、そのスリット（８）に前記連通部（６）（７）が連通され、
その第１鋼板（２ａ）のスリット（８）に整合する位置で、第２鋼板（２ｂ）の平面は平坦に形成され、
冷媒が前記連通部（６）（７）を介して各第１鋼板（２ａ）のスリット（８）に供給されるように形成され、
第１鋼板（２ａ）と第２鋼板（２ｂ）との両者に前記スリット（８）が形成されると共に、両鋼板（２ａ）（２ｂ）の各スリット（８）の位置は積層方向に重ならないように位置ずれして配置されたモータ冷却装置。 A stator (1) is formed of laminated steel sheets, and each of the steel sheets (2) has a matching outer periphery, and a plurality of protrusions (3) are provided radially, and the protrusions (3) of the laminated steel sheets are provided. In the motor cooling device in which the electromagnetic poles (4) are formed and the magnetic pole forming coil (5) is wound around the outer circumference of each electromagnetic pole (4),
The laminated steel plate includes a first steel plate (2a) and a second steel plate (2b), and the first steel plate (2a) and the second steel plate (2b) form a pair of communicating portions that form a refrigerant inlet / outlet ( 6) communicated in the stacking direction in (7),
In the first steel plate (2a), slits (8) are formed in the radial direction on the plane of each protrusion (3), and the communication portions (6) and (7) are communicated with the slits (8).
At the position aligned with the slit (8) of the first steel plate (2a), the plane of the second steel plate (2b) is formed flat,
The refrigerant is formed to be supplied to the slits (8) of the first steel plates (2a) through the communication portions (6) and (7),
The slit (8) is formed in both the first steel plate (2a) and the second steel plate (2b), and the positions of the slits (8) of the steel plates (2a) and (2b) do not overlap in the stacking direction. The motor cooling device arranged so as to be displaced . 請求項１に記載のモータ冷却装置において、
第１鋼板（２ａ）と第２鋼板（２ｂ）とが交互に積層されたモータ冷却装置。 The motor cooling device according to claim 1,
A motor cooling device in which the first steel plate (2a) and the second steel plate (2b) are alternately laminated .
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