| 摘要 |
PROBLEM TO BE SOLVED: To provide techniques for surely disposing a magnet in the inner peripheral surface of a stator yoke of a driving motor of a power tool. SOLUTION: An impact driver 100 (power tool) includes: a driving motor 121 having a rotor and a stator 135 where the rotor is rotatably disposed inside, in which a stator yoke 135a and a magnet disposed along the circumferential direction on the inner peripheral surface of the stator yoke 135a to generate a magnetic field for driving the rotor in rotation are disposed on the stator 135; and a driver bit 109 (a tip tool) for performing a predetermined processing work by the rotary drive of the rotor. The magnet is provided with a plurality of magnetic poles disposed in the circumferential direction, and disposed extending over the whole inner peripheral surface of the stator yoke 135a, and a recessed part 20 in the radial direction of the stator yoke is formed extending in the axial direction of the stator yoke between the stator yoke 135a and the magnet. COPYRIGHT: (C)2006,JPO&NCIPI
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