| 摘要 |
An electric power steering device ( 1 ) includes a steering assist electric motor ( 7 ) including a rotation shaft ( 8 ) and a motor housing ( 18 ). The electric motor ( 7 ) includes a stator ( 19 ) fixed to the motor housing ( 18 ), a rotor ( 20 ) co-rotatable with the rotation shaft ( 8 ), and rotation angle detecting means ( 21 ) for detecting the rotation angle of the rotor ( 20 ). The rotation angle detecting means ( 21 ) includes a stationary portion ( 28 ) fixed to the motor housing ( 18 ), and a movable portion ( 29 ) co-rotatable with the rotor ( 20 ). The rotor ( 20 ) includes a rotor body ( 31 ), and a rotor magnet ( 32 ) attached to the rotor body ( 31 ) in a co-rotatable manner. A rotor unit ( 33 ) including the rotor ( 20 ) and the movable portion ( 29 ) of the rotation angle detecting means ( 21 ) is provided as a subassembly of the electric motor ( 7 ).
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