ELECTRIC ACTUATOR

• Main Authors: KINJO SHUICHI, UEMATSU YUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 25.04.2019
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

To provide an electric actuator of which the outer shape in an axial direction can be reduced.SOLUTION: An electric actuator comprises: a rotor 22 including a motor shaft 21 extending along a central axis; a stator which faces the rotor while interposing a clearance gap in a radial direction therebetween; a speed reduction mechanism which is coupled to a portion of the motor shaft at one side in an axial direction; a rotation detection part 75 which detects rotation of the rotor; a case in which the rotor, the stator and the rotation detection part are accommodated; and a bearing 51 which is provided in the case and supports a portion of the motor shaft at the other side in the axial direction in a rotatable manner. The case includes a bearing holding part 12e which holds the bearing. The rotation detection part includes: a mounting member 73 which is fixed to the motor shaft; a magnet 74 which is fitted to the mounting member; and a rotation sensor 71 which faces the magnet while interposing a clearance gap therebetween. The magnet is formed in an annular shape extending in a circumferential direction, and disposed at a position overlapped with the bearing when viewed from the radial direction.SELECTED DRAWING: Figure 3 【課題】軸方向の外形を小さくできる電動アクチュエータを提供する。【解決手段】中心軸に沿って延びるモータシャフト２１を有するロータ２２と、ロータと径方向に隙間をあけて対向するステータと、モータシャフトの軸方向一方側の部分に連結される減速機構と、ロータの回転を検出する回転検出部７５と、ロータ、ステータおよび回転検出部を収容するケースと、ケースに設けられ、モータシャフトの軸方向他方側の部分を回転可能に支持するベアリング５１と、を備える。ケースは、ベアリングを保持するベアリング保持部１２ｅを有する。回転検出部は、モータシャフトに固定される取付部材７３と、取付部材に取り付けられるマグネット７４と、マグネットに隙間をあけて対向する回転センサ７１と、を有する。マグネットは、周方向に延びる環状であり、径方向から見てベアリングと重なる位置に配置される。【選択図】図３