| 摘要 |
A hand-held machine tool with improved output efficiency includes a casing to hold a control circuit connected to a power source and an electric motor which includes a stator, a rotor and an output spindle. The stator has a core and a plurality of stator magnetic poles extended radially. The stator magnetic poles are wound by an exciting winding. The core has an axle hole run through by the output spindle. The rotor has a transmission portion fastened to the output spindle and an induction portion extended from the transmission portion and horizontally corresponding to the stator magnetic poles. The induction portion has a plurality of rotor magnetic poles on an inner rim thereof corresponding to the stator magnetic poles. The rotor magnetic poles and stator magnetic poles are magnetically coupled to induce a magnetic force to drive the output spindle to rotate against the stator in the axle hole.
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