JP2020150779A - Housing for motor - Google Patents
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- JP2020150779A JP2020150779A JP2019049122A JP2019049122A JP2020150779A JP 2020150779 A JP2020150779 A JP 2020150779A JP 2019049122 A JP2019049122 A JP 2019049122A JP 2019049122 A JP2019049122 A JP 2019049122A JP 2020150779 A JP2020150779 A JP 2020150779A
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- 239000000696 magnetic material Substances 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000035699 permeability Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000576 Laminated steel Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
Landscapes
- Motor Or Generator Frames (AREA)
Abstract
Description
本発明は、モータからの低周波の磁界漏洩を抑制するためのモータ用筐体に関する。 The present invention relates to a motor housing for suppressing low frequency magnetic field leakage from a motor.
電気自動車やハイブリッド自動車などの車両の駆動用モータからは、低周波の磁界が発生することが知られている。現状では、車室内の磁界強度は十分に低いレベルであるが、今後、駆動用モータの出力向上のために電流が増加し、磁界強度も大きくなることが予想される。そのため、低周波の磁界漏洩を抑制する方法が検討されている。 It is known that a low-frequency magnetic field is generated from a drive motor of a vehicle such as an electric vehicle or a hybrid vehicle. At present, the magnetic field strength in the vehicle interior is at a sufficiently low level, but it is expected that the current will increase and the magnetic field strength will also increase in the future in order to improve the output of the drive motor. Therefore, a method of suppressing low-frequency magnetic field leakage is being studied.
特許文献１には、ケースの外周に切り欠きを設け、その切り欠きから駆動基板の一部をケース外にはみ出させたモータにおいて、そのはみ出した駆動基板を金属製のシールドケースで覆う構造が記載されている。このような構造により、モータ全体をシールド材で覆うよりも小型化できることが記載されている。 Patent Document 1 describes a structure in which a notch is provided on the outer periphery of a case and a part of the drive board protrudes from the notch to the outside of the case, and the protruding drive board is covered with a metal shield case. Has been done. It is described that such a structure can be made smaller than covering the entire motor with a shield material.
特許文献２には、高周波の磁界漏洩を抑制する磁気シールド構造が記載されている。磁気シールド構造は、誘電体からなるケースの内面および外面の少なくとも一方の少なくとも一部に、金属めっきを施したものである。 Patent Document 2 describes a magnetic shield structure that suppresses high-frequency magnetic field leakage. The magnetic shield structure is a case in which at least one of the inner surface and the outer surface of the case made of a dielectric is metal-plated.
発明者らは、電磁界シミュレーションによって漏洩磁界を測定評価した。その結果、車両の駆動用モータからの漏洩磁界の周波数は１ｋＨｚ以下の低周波であることがわかった。一般に車両の駆動用モータはアルミニウムの筐体により覆われているが、漏洩磁界の周波数が低いため、従来の筐体では十分に漏洩磁界を抑制できないことがわかった。 The inventors measured and evaluated the leaked magnetic field by electromagnetic field simulation. As a result, it was found that the frequency of the leakage magnetic field from the drive motor of the vehicle is a low frequency of 1 kHz or less. Generally, the drive motor of a vehicle is covered with an aluminum housing, but it has been found that the conventional housing cannot sufficiently suppress the leakage magnetic field because the frequency of the leakage magnetic field is low.
特許文献１では、ケースからはみ出した駆動基板以外の部分については、従来のモータと同様にケースにより覆われているのみであり、低周波の磁界漏洩は十分に抑制することができない。 In Patent Document 1, the portion other than the drive substrate protruding from the case is only covered by the case as in the conventional motor, and low-frequency magnetic field leakage cannot be sufficiently suppressed.
また、特許文献２では、金属めっきの厚さは数１０μｍ程度であることから、モータから発生する低周波の磁界漏洩を抑制することができない。 Further, in Patent Document 2, since the thickness of the metal plating is about several tens of μm, it is not possible to suppress low-frequency magnetic field leakage generated from the motor.
また、モータ全体を厚い金属で覆うことにより磁界漏洩を抑制することが考えられるが、重量が重くなってしまい、車両の駆動用モータに対しては不適である。 Further, it is conceivable to suppress magnetic field leakage by covering the entire motor with a thick metal, but the weight becomes heavy, which is not suitable for a vehicle drive motor.
そこで本発明の目的は、モータの重量を抑えつつ、低周波の磁界漏洩を抑制することが可能なモータ用筐体を提供することである。 Therefore, an object of the present invention is to provide a housing for a motor capable of suppressing low-frequency magnetic field leakage while suppressing the weight of the motor.
本発明は、モータのステータとロータとを覆うモータ用筐体であって、ステータは、スロットを有したステータコアと、スロットを通して巻かれたコイルとを有し、コイルがステータコアの両端からはみ出した部分である２つのコイルエンド部を有し、モータ用筐体は、ステータおよびロータとを内包する非磁性体からなる第１筐体と、２つのコイルエンド部のうち一方を覆う磁性体からなる第２筐体と、第２筐体と分離して離間し、２つのコイルエンド部のうち他方を覆う磁性体からなる第３筐体と、を有する、ことを特徴とするモータ用筐体である。 The present invention is a housing for a motor that covers a motor stator and a rotor. The stator has a stator core having a slot and a coil wound through the slot, and the coil protrudes from both ends of the stator core. The motor housing has a first housing made of a non-magnetic material including a stator and a rotor, and a magnetic material covering one of the two coil end parts. It is a housing for a motor characterized by having two housings and a third housing made of a magnetic material that is separated from the second housing and covers the other of the two coil end portions. ..
第２筐体および第３筐体は、第１筐体の外側に設けられていることが好ましい。第１筐体内にステータやロータ以外のもの、たとえばステータの冷却装置、などを配置する際に、第２筐体および第３筐体を第１筐体の内側に配置する場合に比べて配置の自由度が大きくなるためである。 The second housing and the third housing are preferably provided on the outside of the first housing. When arranging something other than the stator and rotor, such as a cooling device for the stator, in the first housing, the arrangement is as compared with the case where the second housing and the third housing are arranged inside the first housing. This is because the degree of freedom increases.
第２筐体および第３筐体は、第１筐体との間隔が１０ｍｍ以下であることが好ましい。低周波の磁界の漏洩抑制効果をより高めることができる。特に、第２筐体および第３筐体を第１筐体と接するように設けることが好ましい。 The distance between the second housing and the third housing is preferably 10 mm or less from the first housing. The effect of suppressing leakage of low-frequency magnetic fields can be further enhanced. In particular, it is preferable to provide the second housing and the third housing so as to be in contact with the first housing.
第２筐体および第３筐体は、モータの軸方向および径方向のいずれから見ても、コイルエンド部を覆うように設けられていることが好ましい。低周波の磁界の漏洩抑制効果をより高めることができる。 It is preferable that the second housing and the third housing are provided so as to cover the coil end portion in both the axial direction and the radial direction of the motor. The effect of suppressing leakage of low-frequency magnetic fields can be further enhanced.
第２筐体および第３筐体は、スリットが設けられていてもよい。スリットを設けることで、筐体の振動の周波数を調整することができる。特に、スリットの長手方向がモータの軸方向と平行になるように設けるとよい。スリットを設けることによる磁界漏洩の抑制効果の悪化を少なくできる。 The second housing and the third housing may be provided with slits. By providing the slit, the frequency of vibration of the housing can be adjusted. In particular, it is preferable to provide the slit so that the longitudinal direction is parallel to the axial direction of the motor. It is possible to reduce the deterioration of the effect of suppressing magnetic field leakage due to the provision of the slit.
第２筐体および第３筐体は、モータの径方向から見て、ステータコアとオーバーラップするように設けられていることが好ましい。低周波の磁界の漏洩抑制効果をより高めることができる。 It is preferable that the second housing and the third housing are provided so as to overlap with the stator core when viewed from the radial direction of the motor. The effect of suppressing leakage of low-frequency magnetic fields can be further enhanced.
本発明によれば、モータの重量を抑えつつ、低周波の磁界漏洩を抑制することができる。 According to the present invention, it is possible to suppress low frequency magnetic field leakage while suppressing the weight of the motor.
以下、本発明の具体的な実施例について図を参照に説明するが、本発明は実施例に限定されるものではない。 Hereinafter, specific examples of the present invention will be described with reference to the drawings, but the present invention is not limited to the examples.
図１は、実施例１のモータの構成を示した図である。図１（ａ）は、モータを回転軸方向から見た上面図であり、図１（ｂ）は回転軸に垂直な方向から見た側面図であり、図１（ｃ）はモータの断面図である。モータは三相交流モータであり、図１のように、ステータ１０と、ロータ１１と、第１筐体１２と、第２筐体１３と、第３筐体１４と、で構成されている。図１（ａ）、（ｂ）においては、第１筐体１２を透過して内部構造が見えるように模式的に示している。 FIG. 1 is a diagram showing a configuration of a motor according to the first embodiment. FIG. 1A is a top view of the motor viewed from the direction of the rotation axis, FIG. 1B is a side view of the motor viewed from the direction perpendicular to the rotation axis, and FIG. 1C is a cross-sectional view of the motor. Is. The motor is a three-phase AC motor, and is composed of a stator 10, a rotor 11, a first housing 12, a second housing 13, and a third housing 14, as shown in FIG. 1 (a) and 1 (b) are schematically shown so that the internal structure can be seen through the first housing 12.
ステータ１０は、ステータコア１５とコイル１６により構成されている。ステータコア１５は肉厚の円筒状であり、その円筒の軸方向に貫通するスロット１７が円周方向に等間隔で複数設けられている。ステータコア１５は、たとえば積層鋼板からなる。コイル１６は、スロット１７を通して分布巻きされており、ステータコア１５の両端からはみ出した部分を有する。このはみ出した２つの部分をコイルエンド部１８Ａ、１８Ｂと呼ぶ。なお、コイル１６の巻き方は分布巻きに限らず、集中巻きでもよい。 The stator 10 is composed of a stator core 15 and a coil 16. The stator core 15 has a thick cylindrical shape, and a plurality of slots 17 penetrating in the axial direction of the cylinder are provided at equal intervals in the circumferential direction. The stator core 15 is made of, for example, a laminated steel plate. The coil 16 is distributed and wound through the slot 17, and has portions protruding from both ends of the stator core 15. These two protruding portions are called coil end portions 18A and 18B. The winding method of the coil 16 is not limited to distributed winding, and may be concentrated winding.
ロータ１１は、円柱状であり、ステータ１０の円筒内に同軸に配置されている。ロータ１１の厚さ（回転軸方向の長さ）は、ステータコア１５の厚さ（回転軸方向の長さ）と同一であり、ロータ１１の端面とステータコア１５の端面は、同一面となるように揃えられている。ロータ１１は、内部に磁石が埋め込まれた積層鋼板からなる。ステータ１０のコイル１６に電流を流すと回転磁界が発生し、これによりロータ１１は回転軸回りに回転する。ロータ１１の回転数は、コイル１６に流す電流の周波数に比例する。ロータ１１には図示しない軸が接続されている。 The rotor 11 has a cylindrical shape and is coaxially arranged in the cylinder of the stator 10. The thickness of the rotor 11 (length in the rotation axis direction) is the same as the thickness of the stator core 15 (length in the rotation axis direction), so that the end face of the rotor 11 and the end face of the stator core 15 are the same. It is aligned. The rotor 11 is made of a laminated steel plate in which a magnet is embedded. When a current is passed through the coil 16 of the stator 10, a rotating magnetic field is generated, which causes the rotor 11 to rotate about a rotation axis. The rotation speed of the rotor 11 is proportional to the frequency of the current flowing through the coil 16. A shaft (not shown) is connected to the rotor 11.
第１筐体１２は、中空の直方体であり、内部にステータ１０とロータ１１とを内包している。第１筐体１２は、アルミニウムからなる。アルミニウム以外にも、樹脂など非磁性体材料であれば任意でよい。非磁性体材料は、たとえば比透磁率が５以下の材料である。第１筐体１２の厚みは、たとえば１〜１０ｍｍである。また、第１筐体１２は、３対の面のうち、１対の面がモータの軸に垂直となるように配置されている。その軸に垂直な２面のうち一方を上面１２ａ、他方を下面１２ｃとして、上面１２ａには孔１２ｄが設けられている。孔１２ｄは、ロータ１１に接続する軸を通すためのものである。なお、第１筐体１２の形状は、ステータ１０とロータ１１を内包可能な中空を有した形状であれば直方体に限らず任意であり、円筒状などであってもよい（図５参照）。また、第１筐体１２内に、発電用のモータを含めるようにしてもよい。 The first housing 12 is a hollow rectangular parallelepiped, and contains a stator 10 and a rotor 11 inside. The first housing 12 is made of aluminum. In addition to aluminum, any non-magnetic material such as resin may be used. The non-magnetic material is, for example, a material having a relative magnetic permeability of 5 or less. The thickness of the first housing 12 is, for example, 1 to 10 mm. Further, the first housing 12 is arranged so that one of the three pairs of surfaces is perpendicular to the axis of the motor. One of the two surfaces perpendicular to the axis is the upper surface 12a, the other is the lower surface 12c, and the upper surface 12a is provided with a hole 12d. The hole 12d is for passing a shaft connected to the rotor 11. The shape of the first housing 12 is not limited to a rectangular parallelepiped as long as it has a hollow shape capable of containing the stator 10 and the rotor 11, and may be cylindrical or the like (see FIG. 5). Further, the motor for power generation may be included in the first housing 12.
第２筐体１３および第３筐体１４は、低周波磁界の主たる発生箇所であるコイルエンド部１８Ａ、１８Ｂをそれぞれ覆い、モータからの低周波磁界の漏洩を抑制するために設けるものである。ここで低周波磁界とは、周波数が１ｋＨｚ以下の磁界である。 The second housing 13 and the third housing 14 cover the coil end portions 18A and 18B, which are the main generation points of the low frequency magnetic field, respectively, and are provided to suppress leakage of the low frequency magnetic field from the motor. Here, the low frequency magnetic field is a magnetic field having a frequency of 1 kHz or less.
低周波磁界の主たる発生箇所がコイルエンド部１８Ａ、１８Ｂとなる理由について、図２を参照に説明する。図２中、ｚ軸方向がモータの軸方向、ｙ軸方向がモータの径方向を示している。図２のように、磁界はコイル１６の線回りにループ状に発生するが、ステータコア１５とロータ１１に挟まれた領域で発生した磁界は、ステータコア１５およびロータ１１の内部を通るため、ｙ軸方向には強い磁界を発生させない（図２中の実線で示したループ）。一方、ステータコア１５とロータ１１に挟まれていない領域で発生した磁界は、ステータコア１５とロータ１１を通らず、コイルエンド部１８Ａ、１８Ｂの周囲を回る。そのため、コイルエンド部１８Ａ、１８Ｂの近傍に強い磁界を発生させる（図２中の点線で示したループ）。 The reason why the coil end portions 18A and 18B are the main generation points of the low frequency magnetic field will be described with reference to FIG. In FIG. 2, the z-axis direction indicates the axial direction of the motor, and the y-axis direction indicates the radial direction of the motor. As shown in FIG. 2, the magnetic field is generated in a loop around the line of the coil 16, but the magnetic field generated in the region sandwiched between the stator core 15 and the rotor 11 passes through the inside of the stator core 15 and the rotor 11, so that the y-axis No strong magnetic field is generated in the direction (loop shown by the solid line in FIG. 2). On the other hand, the magnetic field generated in the region not sandwiched between the stator core 15 and the rotor 11 does not pass through the stator core 15 and the rotor 11 and goes around the coil end portions 18A and 18B. Therefore, a strong magnetic field is generated in the vicinity of the coil end portions 18A and 18B (loop shown by the dotted line in FIG. 2).
第２筐体１３は、第１筐体１２の内面に接合された鋼板である。図１のように、第２筐体１３は、第１筐体１２の内面のうち、上面１２ａ（回転軸に垂直な面のうち、コイルエンド部１８Ａ近傍の面）と、一方のコイルエンド部１８Ａ近傍の側面１２ｂに接合されている。上面１２ａについては、ロータ１１と同心で同一の直径の円形の孔１３ａが設けられた鋼板が接合されている。孔１３ａは、ロータに接続する軸（図示しない）を通すためのものである。また、側面１２ｂについては、側面から見てコイルエンド部１８Ａの領域を含む範囲に鋼板が接合されている。このようにして、第２筐体１３は、軸方向から見ても径方向から見ても、コイルエンド部１８Ａを覆うように設けられている。つまり、軸方向から見ても径方向から見ても、コイルエンド部１８Ａの領域は、第２筐体１３の領域内に収まるように設けられている。 The second housing 13 is a steel plate joined to the inner surface of the first housing 12. As shown in FIG. 1, the second housing 13 has an upper surface 12a (a surface perpendicular to the rotation axis near the coil end portion 18A) and one coil end portion of the inner surface of the first housing 12. It is joined to the side surface 12b near 18A. A steel plate having circular holes 13a having the same diameter as the rotor 11 is joined to the upper surface 12a. The hole 13a is for passing a shaft (not shown) connected to the rotor. Further, with respect to the side surface 12b, steel plates are joined in a range including the region of the coil end portion 18A when viewed from the side surface. In this way, the second housing 13 is provided so as to cover the coil end portion 18A both when viewed from the axial direction and from the radial direction. That is, the region of the coil end portion 18A is provided so as to be contained within the region of the second housing 13 regardless of whether it is viewed from the axial direction or the radial direction.
第３筐体１４は、第１筐体１２の内面に接合され、第２筐体１３とは分離、離間して設けられた鋼板である。図１のように、第３筐体１４は、第１筐体１２の内面のうち、下面１２ｃ（回転軸に垂直な面のうち、コイルエンド部１８Ｂ近傍の面）と、一方のコイルエンド部１８Ｂ近傍の側面１２ｂに接合されている。下面１２ｃについては、全面に鋼板が接合されている。また、側面１２ｂについては、モータを側面から見てコイルエンド部１８Ｂの領域を含む範囲に鋼板が接合されていて、第２筐体１３とは間隔をあけて設けられている。このようにして、第２筐体１３は、軸方向から見ても径方向から見ても、コイルエンド部１８Ｂを覆うように設けられている。 The third housing 14 is a steel plate that is joined to the inner surface of the first housing 12 and is provided separately and separated from the second housing 13. As shown in FIG. 1, the third housing 14 has a lower surface 12c (a surface perpendicular to the rotation axis near the coil end portion 18B) and one coil end portion of the inner surface of the first housing 12. It is joined to the side surface 12b near 18B. A steel plate is joined to the entire surface of the lower surface 12c. Further, with respect to the side surface 12b, steel plates are joined in a range including the region of the coil end portion 18B when the motor is viewed from the side surface, and the side surface 12b is provided at a distance from the second housing 13. In this way, the second housing 13 is provided so as to cover the coil end portion 18B both when viewed from the axial direction and from the radial direction.
第２筐体１３および第３筐体１４は、鋼板以外にも、磁性体材料であれば任意でよい。ここで、磁性体とは、比透磁率が第１筐体１２に比べて十分に大きな材料であり、たとえば比透磁率が１０以上の材料である。より具体的には、鉄、ニッケル、コバルト、それらを主成分とする合金（たとえばケイ素鋼）、フェライト、などを用いることができる。鋼板を用いる場合には、表面に亜鉛やニッケルなどのめっきを施してさびの防止を図ってもよい。比透磁率が高いほど低周波磁界の漏洩抑制効果は高くなるため、比透磁率は５０以上の材料が好ましい。 The second housing 13 and the third housing 14 may be any magnetic material other than the steel plate. Here, the magnetic material is a material having a relatively large relative magnetic permeability as compared with the first housing 12, and is, for example, a material having a specific magnetic permeability of 10 or more. More specifically, iron, nickel, cobalt, alloys containing them as main components (for example, silicon steel), ferrite, and the like can be used. When a steel plate is used, the surface may be plated with zinc, nickel, or the like to prevent rust. The higher the specific magnetic permeability, the higher the effect of suppressing leakage of the low frequency magnetic field. Therefore, a material having a specific magnetic permeability of 50 or more is preferable.
また、第２筐体１３および第３筐体１４は厚いほど低周波磁界の漏洩抑制効果は高くなる。そのため、第２筐体１３および第３筐体１４の厚みは０．５ｍｍ以上とすることが好ましい。ただし、あまり厚くするとモータの重量の増加を招くため、５ｍｍ以下とすることが好ましい。 Further, the thicker the second housing 13 and the third housing 14, the higher the effect of suppressing leakage of the low frequency magnetic field. Therefore, the thickness of the second housing 13 and the third housing 14 is preferably 0.5 mm or more. However, if it is too thick, the weight of the motor will increase, so it is preferably 5 mm or less.
実施例１では、第２筐体１３および第３筐体１４は第１筐体１２の内側に接合させているが、外側に接合させてもよいし（図３参照）、第２筐体１３と第３筐体１４の一方を内側、他方を外側に接合させてもよい。外側に第２筐体１３および第３筐体１４を接合させた場合、第１筐体１２内にステータ１０の冷却装置などを設ける際の配置の自由度が増すので、その点で外側に設けることに利点がある。 In the first embodiment, the second housing 13 and the third housing 14 are joined to the inside of the first housing 12, but may be joined to the outside (see FIG. 3), or the second housing 13 And one of the third housing 14 may be joined to the inside and the other to the outside. When the second housing 13 and the third housing 14 are joined to the outside, the degree of freedom of arrangement when the cooling device of the stator 10 or the like is provided in the first housing 12 is increased. There is an advantage in that.
また、実施例１では、第１筐体１２と第２筐体１３、第１筐体１２と第３筐体１４を接合させて隙間をなくしているが、隙間があってもよい。ただし、隙間は１０ｍｍ以下であることが好ましい。１０ｍｍ以下とすれば、隙間が空くことで低周波磁界の漏洩抑制効果は若干低下するものの、隙間をなくした場合に比べて１ｄＢ以下の低下で済む。 Further, in the first embodiment, the first housing 12 and the second housing 13 and the first housing 12 and the third housing 14 are joined to eliminate the gap, but there may be a gap. However, the gap is preferably 10 mm or less. If the thickness is 10 mm or less, the effect of suppressing leakage of the low-frequency magnetic field is slightly reduced due to the gap, but the reduction is 1 dB or less as compared with the case where the gap is eliminated.
第１筐体１２と第２筐体１３の接合、および第１筐体１２と第３筐体１４の接合は、任意の接合方法でよい。たとえば、スポット溶接、シーム溶接、アーク溶接、レーザ溶接などの溶融接合や、摩擦溶接、レーザ圧接などの固相接合や、ボルト、ナット、ブラインドリベットなどを用いた機械的接合や、接着剤などを用いた接着や、これらの複合方法を用いることができる。ボルトを用いて接合する場合、図４のように、第１筐体１２と接合する凸部１９を設け、凸部１９と第２筐体１３あるいは第３筐体１４とをボルト２０およびナット２１によって接合するとよい。第１筐体１２に穴が空かないため、磁界漏洩をより抑制することができる。 Any joining method may be used for joining the first housing 12 and the second housing 13 and joining the first housing 12 and the third housing 14. For example, melt bonding such as spot welding, seam welding, arc welding, laser welding, solid phase bonding such as friction welding and laser pressure welding, mechanical bonding using bolts, nuts, blind rivets, etc., adhesives, etc. The bonding used or a composite method thereof can be used. When joining using bolts, as shown in FIG. 4, a convex portion 19 for joining with the first housing 12 is provided, and the convex portion 19 and the second housing 13 or the third housing 14 are connected to the bolt 20 and the nut 21. It is good to join by. Since there is no hole in the first housing 12, magnetic field leakage can be further suppressed.
また、実施例１では、第２筐体１３および第３筐体１４を第１筐体１２の４つの側面１２ｂ全てに設け、コイルエンド部１８Ａ、１８Ｂを側面の全方位から覆うようにしているが、全方位を覆う必要はなく、側面の一部方位を覆うように設けられていてもよい。第２筐体１３および第３筐体１４が設けられていない方向に対しては、低周波磁界の漏洩を抑制することはできないが、設けられている方向に対しては、低周波磁界の漏洩を抑制することができる。たとえば、図６のように、径方向にｘ軸、ｙ軸を取り、モータの軸を原点にした場合に、第２筐体１３および第３筐体１４がｙ座標が正となる半分を覆うようにしてもよい。この場合、ｙ軸の負方向については低周波磁界の漏洩を低減できないが、ｙ軸の正方向については低周波磁界の漏洩を低減できる。このような構成は、漏洩を抑制したい方向が決まっている場合や、モータの重量をより減らしたい場合に有効である。ただし低周波磁界の漏洩を十分に低減するため、低周波磁界の漏洩を抑制したい方向に対して±６０°以上の方位を覆うように設けることが好ましい。また、モータの重量の減少の点からは、低周波磁界の漏洩を抑制したい方向に対して±１２０°以下の方位を覆うように設けることが好ましい。 Further, in the first embodiment, the second housing 13 and the third housing 14 are provided on all four side surfaces 12b of the first housing 12, and the coil end portions 18A and 18B are covered from all directions of the side surfaces. However, it is not necessary to cover all directions, and it may be provided so as to cover a part of the side surface. Leakage of the low frequency magnetic field cannot be suppressed in the direction in which the second housing 13 and the third housing 14 are not provided, but leakage of the low frequency magnetic field in the direction in which the second housing 13 and the third housing 14 are provided. Can be suppressed. For example, as shown in FIG. 6, when the x-axis and the y-axis are taken in the radial direction and the motor axis is the origin, the second housing 13 and the third housing 14 cover the half where the y-coordinate is positive. You may do so. In this case, the leakage of the low frequency magnetic field cannot be reduced in the negative direction of the y-axis, but the leakage of the low frequency magnetic field can be reduced in the positive direction of the y-axis. Such a configuration is effective when the direction in which leakage is desired to be suppressed is determined, or when the weight of the motor is to be further reduced. However, in order to sufficiently reduce the leakage of the low frequency magnetic field, it is preferable to cover the direction of ± 60 ° or more with respect to the direction in which the leakage of the low frequency magnetic field is desired to be suppressed. From the viewpoint of reducing the weight of the motor, it is preferable to cover the direction of ± 120 ° or less with respect to the direction in which the leakage of the low frequency magnetic field is desired to be suppressed.
第２筐体１３、第３筐体１４にスリット２２を設けてもよい（図７参照）。スリット２２は、細長い長方形状の貫通孔である。ロータ１１が高速回転すると、第１筐体１２に振動が発生するが、第１筐体１２には第２筐体１３および第３筐体１４が接合されているため、その振動の周波数が変化する可能性がある。このような場合に、第１筐体１２の寸法によっては、第２筐体１３、第３筐体１４にスリットを設けて、筐体の振動の周波数を調整することが考えられる。スリットの長手方向は任意の方向でよいが、モータの軸方向と平行に設けることが好ましい。モータの軸方向と平行にスリットを設ければ、低周波磁界の漏洩低減効果にほとんど影響を与えない。一方、モータの軸方向に直交する方向にスリットを設けると、低周波磁界の漏洩低減効果がやや悪化してしまう。これは、コイルエンド部１８Ａ、Ｂから発生する低周波磁界は軸方向の成分が強いため、軸方向に直交する方向にスリットを設けると低周波磁界が漏洩しやすくなるためと考えられる。 Slits 22 may be provided in the second housing 13 and the third housing 14 (see FIG. 7). The slit 22 is an elongated rectangular through hole. When the rotor 11 rotates at high speed, vibration is generated in the first housing 12, but since the second housing 13 and the third housing 14 are joined to the first housing 12, the frequency of the vibration changes. there's a possibility that. In such a case, depending on the dimensions of the first housing 12, it is conceivable to provide slits in the second housing 13 and the third housing 14 to adjust the vibration frequency of the housing. The longitudinal direction of the slit may be any direction, but it is preferably provided parallel to the axial direction of the motor. If the slit is provided parallel to the axial direction of the motor, the effect of reducing leakage of the low frequency magnetic field is hardly affected. On the other hand, if the slit is provided in the direction orthogonal to the axial direction of the motor, the effect of reducing leakage of the low frequency magnetic field is slightly deteriorated. It is considered that this is because the low-frequency magnetic field generated from the coil end portions 18A and B has a strong axial component, and therefore, if a slit is provided in the direction orthogonal to the axial direction, the low-frequency magnetic field tends to leak.
また、第１筐体１２とステータコア１５との間には隙間が生じる。そのため、第２筐体１３および第３筐体１４によって効果的に低周波磁界の漏洩を低減するためには、径方向から見て、第２筐体１３および第３筐体１４とステータコア１５とがオーバーラップするように設定することが好ましい。オーバーラップの幅は、第１筐体１２とステータコア１５との間隔に応じて適宜設定する。また、第２筐体１３と第３筐体１４の離間距離は、オーバーラップの幅とモータの重量とを考慮して適宜設定する。 In addition, a gap is formed between the first housing 12 and the stator core 15. Therefore, in order to effectively reduce the leakage of the low frequency magnetic field by the second housing 13 and the third housing 14, the second housing 13, the third housing 14, and the stator core 15 are used when viewed from the radial direction. Is preferably set so as to overlap. The width of the overlap is appropriately set according to the distance between the first housing 12 and the stator core 15. Further, the separation distance between the second housing 13 and the third housing 14 is appropriately set in consideration of the width of the overlap and the weight of the motor.
以上、実施例１のモータは、筐体が第１筐体１２と、第２筐体１３と、第３筐体１４とにより構成されており、磁性体である第２筐体１３と第３筐体とが、低周波磁界の主たる発生箇所である２つのコイルエンド部１８Ａ、１８Ｂをそれぞれ覆うように設けられているため、低周波の磁界漏洩を効果的に抑制することができる。特に、周波数１ｋＨｚ以下の磁界漏洩を効果的に抑制することができる。また、第２筐体１３と第３筐体１４とを分離、離間して設けることで、モータ全体を覆わず、低周波磁界漏洩の抑制に必要な領域のみに設けているため、モータの重量の増加を抑制しつつ、磁界漏洩を抑制することができる。 As described above, in the motor of the first embodiment, the housing is composed of the first housing 12, the second housing 13, and the third housing 14, and the second housing 13 and the third housing are magnetic materials. Since the housing is provided so as to cover the two coil end portions 18A and 18B, which are the main generation points of the low frequency magnetic field, the low frequency magnetic field leakage can be effectively suppressed. In particular, magnetic field leakage with a frequency of 1 kHz or less can be effectively suppressed. Further, since the second housing 13 and the third housing 14 are separated and provided separately from each other, the entire motor is not covered and only the region necessary for suppressing low frequency magnetic field leakage is provided, so that the weight of the motor It is possible to suppress magnetic field leakage while suppressing the increase in.
なお、実施例１のモータは三相交流モータであるが、本発明は交流モータに限るものではなく、コイルエンド部を有した構造のモータであれば任意のモータに対して適用することができる。たとえば、直流モータや直流ブラシレスモータなどにも適用することができる。また、本発明はモータの制御方法によらず、たとえば矩形制御でもＰＷＭ制御でもよい。 Although the motor of the first embodiment is a three-phase AC motor, the present invention is not limited to the AC motor, and can be applied to any motor having a structure having a coil end portion. .. For example, it can be applied to a DC motor, a DC brushless motor, and the like. Further, the present invention does not depend on the control method of the motor, and may be, for example, rectangular control or PWM control.
次に、実施例１のモータに関する各種シミュレーション結果を説明する。 Next, various simulation results relating to the motor of the first embodiment will be described.
（実験１）
モータから漏洩する低周波磁界の強度をシミュレーションによって求めるため、以下のようなモデルを作成した。実施例１のモータについて、第２筐体１３および第３筐体１４の材料を比透磁率が５００の鋼板とし、厚みを２ｍｍとし、各種寸法を以下の通りに設定したモデル（実験例３）を作成した。なお、モータの軸方向にｚ軸、径方向にｘ軸、ｙ軸を取り、原点はモータの中心とした。また、各種寸法は、第１筐体１２を軸方向から見たときの長方形の一辺を１とした比率で示す。第１筐体１２は縦（ｘ軸方向）に幅が１、横（ｙ軸方向）に幅が０．９６、高さ（ｚ軸方向）が０．８４の直方体とした。また、第１筐体１２からステータコア１５までの距離は０．０８３とした。また、第２筐体１３および第３筐体１４のｚ軸方向の幅は０．３１とし、第２筐体１３と第３筐体１４との離間距離は０．２３とした。また、第２筐体１３と第３筐体１４は、コイルエンド部１８Ａ、１８Ｂに対して０．０７４オーバーラップさせた。
(Experiment 1)
The following model was created to determine the strength of the low-frequency magnetic field leaking from the motor by simulation. Regarding the motor of Example 1, a model in which the materials of the second housing 13 and the third housing 14 are steel plates having a relative magnetic permeability of 500, the thickness is 2 mm, and various dimensions are set as follows (Experimental Example 3). It was created. The z-axis was taken in the axial direction of the motor, the x-axis and the y-axis were taken in the radial direction, and the origin was the center of the motor. Further, various dimensions are shown as a ratio in which one side of the rectangle when the first housing 12 is viewed from the axial direction is 1. The first housing 12 is a rectangular parallelepiped having a width of 1 in the vertical direction (x-axis direction), a width of 0.96 in the horizontal direction (y-axis direction), and a height (z-axis direction) of 0.84. The distance from the first housing 12 to the stator core 15 is 0.083. Further, the width of the second housing 13 and the third housing 14 in the z-axis direction is 0.31, and the separation distance between the second housing 13 and the third housing 14 is 0.23. Further, the second housing 13 and the third housing 14 overlapped with the coil end portions 18A and 18B by 0.074.
また、比較のため、以下の構造のモデルを作成した。実験例１は、実験例３の構造から第２筐体１３および第３筐体１４を省いた構造である。実験例２は、実験例３の構造から、第２筐体１３および第３筐体１４のうち、第１筐体１２の上面１２ａおよび下面１２ｃと接する面を省いた構造である。実験例４は、実験例３の構造から、第１筐体１２の上面１２ａと第２筐体１３との間、および第１筐体１２の下面１２ｃと第３筐体１４との間に、０．００７の隙間を設け、第２筐体１３および第３筐体１４のｚ軸方向の幅を０．３０に変更した構造である。実験例５は、実験例３の構造から、第２筐体１３および第３筐体１４のうち、第１筐体１２の上面１２ａおよび下面１２ｃと接する面のみ残した構造である。 For comparison, a model with the following structure was created. Experimental Example 1 is a structure in which the second housing 13 and the third housing 14 are omitted from the structure of Experimental Example 3. Experimental Example 2 is a structure in which the surfaces of the second housing 13 and the third housing 14 that are in contact with the upper surface 12a and the lower surface 12c of the first housing 12 are omitted from the structure of Experimental Example 3. In Experimental Example 4, from the structure of Experimental Example 3, between the upper surface 12a of the first housing 12 and the second housing 13, and between the lower surface 12c of the first housing 12 and the third housing 14, The structure is such that a gap of 0.007 is provided and the widths of the second housing 13 and the third housing 14 in the z-axis direction are changed to 0.30. Experimental Example 5 is a structure in which only the surfaces of the second housing 13 and the third housing 14 that are in contact with the upper surface 12a and the lower surface 12c of the first housing 12 are left from the structure of Experimental Example 3.
上記のように設定した実験例１〜５のモデルについて、磁界強度をシミュレーションによって求めた。磁界強度は径方向、軸方向でそれぞれ求め、径方向の磁界強度は、ｙ＝１．１、ｘ＝ｚ＝０の位置における磁界ベクトルの大きさ、軸方向の磁界強度は、ｚ＝１．１、ｘ＝ｙ＝０の位置における磁界ベクトルの大きさである。また、磁界の周波数は１６Ｈｚである。 For the models of Experimental Examples 1 to 5 set as described above, the magnetic field strength was obtained by simulation. The magnetic field strength is obtained in the radial direction and the axial direction, respectively. The magnetic field strength in the radial direction is the magnitude of the magnetic field vector at the positions of y = 1.1 and x = z = 0, and the magnetic field strength in the axial direction is z = 1. 1. The magnitude of the magnetic field vector at the position of x = y = 0. The frequency of the magnetic field is 16 Hz.
図８は、その結果を示したグラフである。縦軸は磁界強度の低減量であり、実験例１（第２筐体１３および第３筐体１４を設けない構造）を基準としたｄＢ値である。図８（ａ）は、径方向の磁界強度、図８（ｂ）は、軸方向の磁界強度である。 FIG. 8 is a graph showing the result. The vertical axis represents the amount of reduction in the magnetic field strength, and is a dB value based on Experimental Example 1 (a structure in which the second housing 13 and the third housing 14 are not provided). FIG. 8A shows the magnetic field strength in the radial direction, and FIG. 8B shows the magnetic field strength in the axial direction.
図８のように、実験例３の構造では、第２筐体１３および第３筐体１４が、コイルエンド部１８Ａ、１８Ｂを軸方向、径方向の両方から覆っているため、高い磁界低減効果を実現できており、径方向では１０ｄＢ、軸方向では４ｄＢの低減量であった。 As shown in FIG. 8, in the structure of Experimental Example 3, since the second housing 13 and the third housing 14 cover the coil end portions 18A and 18B from both the axial direction and the radial direction, a high magnetic field reduction effect is obtained. Was achieved, and the reduction amount was 10 dB in the radial direction and 4 dB in the axial direction.
一方、実験例４の構造では、第２筐体１３および第３筐体１４がコイルエンド部１８Ａ、１８Ｂを軸方向、径方向の両方から覆っているものの、第１筐体１２と第２筐体１３および第３筐体１４との間に隙間があるため、そこから磁界が漏れ、実験例３に比べて低減量が小さくなっていた。 On the other hand, in the structure of Experimental Example 4, although the second housing 13 and the third housing 14 cover the coil end portions 18A and 18B from both the axial direction and the radial direction, the first housing 12 and the second housing Since there is a gap between the body 13 and the third housing 14, a magnetic field leaks from the gap, and the amount of reduction is smaller than that of Experimental Example 3.
また、実験例２では、第２筐体１３および第３筐体１４が径方向においてはコイルエンド部１８Ａ、１８Ｂを覆っているため、径方向の磁界漏洩についてはある程度低減できていたが、軸方向においてはコイルエンド部１８Ａ、１８Ｂを覆っていないため、軸方向の磁界漏洩についてはほとんど低減できなかった。 Further, in Experimental Example 2, since the second housing 13 and the third housing 14 cover the coil end portions 18A and 18B in the radial direction, the magnetic field leakage in the radial direction could be reduced to some extent, but the shaft. Since the coil end portions 18A and 18B are not covered in the direction, the magnetic field leakage in the axial direction can hardly be reduced.
また、実験例４では、第２筐体１３および第３筐体１４が軸方向においてはコイルエンド部１８Ａ、１８Ｂを覆っているため、軸方向の磁界漏洩についてはある程度低減できていたが、径方向においてはコイルエンド部１８Ａ、１８Ｂを覆っていないため、径方向の磁界漏洩についてはほとんど低減できなかった。 Further, in Experimental Example 4, since the second housing 13 and the third housing 14 cover the coil end portions 18A and 18B in the axial direction, the magnetic field leakage in the axial direction could be reduced to some extent, but the diameter. Since the coil end portions 18A and 18B are not covered in the direction, the magnetic field leakage in the radial direction can hardly be reduced.
（実験２）
実験例３の構造について、第２筐体１３および第３筐体１４の比透磁率を５００から１００、５０に変化させたところ、径方向の磁界強度の低減量はそれぞれ７．７ｄＢ、５．８ｄＢとなった。このことから、第２筐体１３および第３筐体１４の比透磁率が高いほど磁界漏洩の低減効果が高いことがわかった。
(Experiment 2)
Regarding the structure of Experimental Example 3, when the relative magnetic permeability of the second housing 13 and the third housing 14 was changed from 500 to 100 and 50, the amount of reduction in the magnetic field strength in the radial direction was 7.7 dB, 5. It became 8 dB. From this, it was found that the higher the relative magnetic permeability of the second housing 13 and the third housing 14, the higher the effect of reducing magnetic field leakage.
（実験３）
実験例３の構造について、第２筐体１３および第３筐体１４の厚みを２ｍｍから１ｍｍ、０．５ｍｍと変化させたところ、径方向の磁界強度の低減量はそれぞれ７．７ｄＢ、５．８ｄＢとなった。このことから、第２筐体１３および第３筐体１４が厚いほど磁界漏洩の低減効果が高いことがわかった。
(Experiment 3)
Regarding the structure of Experimental Example 3, when the thicknesses of the second housing 13 and the third housing 14 were changed from 2 mm to 1 mm and 0.5 mm, the amount of reduction in the magnetic field strength in the radial direction was 7.7 dB, 5. It became 8 dB. From this, it was found that the thicker the second housing 13 and the third housing 14, the higher the effect of reducing magnetic field leakage.
（実験４）
実験例３の構造について、第２筐体１３および第３筐体１４が第１筐体１２の内面に接合する構造から外面に接合する構造に替えたところ、磁界強度の低減量にはほとんど変化は見られなかった。
(Experiment 4)
Regarding the structure of Experimental Example 3, when the structure in which the second housing 13 and the third housing 14 are joined to the inner surface of the first housing 12 is changed to the structure in which the second housing 13 and the third housing 14 are joined to the outer surface, the amount of reduction in the magnetic field strength is almost changed. Was not seen.
（実験５）
実験例３の構造について、第２筐体１３および第３筐体１４にスリットを設けて磁界強度の低減量がどう変化するかを検討した。スリットは長さ０．２８、幅０．０１５とし、第２筐体１３および第３筐体１４のうち、径方向を覆う領域にスリットを１つ設けた。またスリットの長手方向は、軸方向に平行な方向（以下、実験例６）、軸方向に垂直な方向（以下、実験例７）とした。
(Experiment 5)
Regarding the structure of Experimental Example 3, slits were provided in the second housing 13 and the third housing 14, and how the amount of reduction in the magnetic field strength changed was examined. The slit has a length of 0.28 and a width of 0.015, and one slit is provided in a region of the second housing 13 and the third housing 14 that covers the radial direction. The longitudinal direction of the slit was a direction parallel to the axial direction (hereinafter, Experimental Example 6) and a direction perpendicular to the axial direction (hereinafter, Experimental Example 7).
図９は、その結果を示したグラフである。縦軸は図８と同様である。図９（ａ）は、径方向の磁界強度、図９（ｂ）は、軸方向の磁界強度である。図９のように、スリットの長手方向を軸方向に平行とした実験例６では、径方向の磁界強度の低減量は、実験例３の場合とほとんど差がなかった。また、スリットの長手方向を軸方向に垂直とした実験例７では、径方向の磁界強度の低減量は、実験例３の場合よりもおよそ０．９ｄＢ低下していた。また、軸方向の磁界強度の低減量は、実験例６、７のいずれも実験例３と差がなかった。この結果から、第２筐体１３および第３筐体１４にスリットを設ける場合には、スリットの長手方向を軸方向に平行とすることで、磁界強度の低減量に影響を及ぼさないようにできることがわかった。 FIG. 9 is a graph showing the result. The vertical axis is the same as in FIG. 9 (a) shows the magnetic field strength in the radial direction, and FIG. 9 (b) shows the magnetic field strength in the axial direction. As shown in FIG. 9, in Experimental Example 6 in which the longitudinal direction of the slit was parallel to the axial direction, the amount of reduction in the magnetic field strength in the radial direction was almost the same as that in Experimental Example 3. Further, in Experimental Example 7 in which the longitudinal direction of the slit was perpendicular to the axial direction, the amount of reduction in the magnetic field strength in the radial direction was about 0.9 dB lower than that in Experimental Example 3. Further, the amount of reduction in the magnetic field strength in the axial direction was not different from that of Experimental Example 3 in all of Experimental Examples 6 and 7. From this result, when slits are provided in the second housing 13 and the third housing 14, the longitudinal direction of the slits is parallel to the axial direction so as not to affect the amount of reduction in the magnetic field strength. I understood.
本発明は、電気自動車やハイブリッド自動車の駆動用モータなどに適用することができる。 The present invention can be applied to drive motors for electric vehicles and hybrid vehicles.
１０：ステータ
１１：ロータ
１２：第１筐体
１３：第２筐体
１４：第３筐体
１５：ステータコア
１６：コイル
１７：スロット
１８Ａ、１８Ｂ：コイルエンド部
10: Stator 11: Rotor 12: 1st housing 13: 2nd housing 14: 3rd housing 15: Stator core 16: Coil 17: Slots 18A, 18B: Coil end
Claims (8)
前記ステータは、スロットを有したステータコアと、前記スロットを通して巻かれたコイルとを有し、前記コイルが前記ステータコアの両端からはみ出した部分である２つのコイルエンド部を有し、
前記モータ用筐体は、
前記ステータおよび前記ロータとを内包する非磁性体からなる第１筐体と、
２つの前記コイルエンド部のうち一方を覆う磁性体からなる第２筐体と、
前記第２筐体と分離して離間し、２つの前記コイルエンド部のうち他方を覆う磁性体からなる第３筐体と、を有する、
ことを特徴とするモータ用筐体。 A housing for a motor that covers the stator and rotor of the motor.
The stator has a stator core having a slot and a coil wound through the slot, and has two coil end portions in which the coil protrudes from both ends of the stator core.
The motor housing is
A first housing made of a non-magnetic material containing the stator and the rotor,
A second housing made of a magnetic material that covers one of the two coil end portions,
It has a third housing made of a magnetic material that separates and separates from the second housing and covers the other of the two coil end portions.
A housing for a motor that is characterized by this.
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| JP2019049122A JP7249176B2 (en) | 2019-03-15 | 2019-03-15 | housing for motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114221493A (en) * | 2020-09-18 | 2022-03-22 | 日本电产三协株式会社 | Encoder and motor |
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| JP2000358341A (en) * | 1999-06-15 | 2000-12-26 | Aisin Seiki Co Ltd | Motor |
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| AU2003252308A1 (en) | 2003-07-31 | 2005-02-15 | Nec Machinery Corporation | Method for recognizing work in die bonder and die bonder |
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| JPS502327Y1 (en) * | 1970-09-29 | 1975-01-22 | ||
| JPS56157235A (en) * | 1980-05-09 | 1981-12-04 | Hitachi Ltd | Magnetic shield cover |
| JPS58100450U (en) * | 1981-12-28 | 1983-07-08 | 日本サ−ボ株式会社 | electric motor end bracket |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221493A (en) * | 2020-09-18 | 2022-03-22 | 日本电产三协株式会社 | Encoder and motor |
| CN114221493B (en) * | 2020-09-18 | 2024-05-31 | 日本电产三协株式会社 | Encoder and motor |
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