| 摘要 |
PROBLEM TO BE SOLVED: To reduce resistance of a rotor coil, to reduce electric resistance by reducing a copper loss, and to improve efficiency of an electric blower by constituting the rotor coil of a rotor iron core of a commutator electric motor out of the specific number of electric wires per unit coil. SOLUTION: When a surface recess/projection of a coil becomes too large by thickening of the coil of a rotor and a stator arranged in an air duct of an air flow from an air blower, electric resitance and a windage loss increase. Thus, a rotor coil 6b wound round respective magnetic poles of a rotor iron core 6a of a commutator electric motor 1 is constituted of two or more electric wires per single coil. Thus, even if the respective electric wires are fine lines, the cross-sectional area is substantially increased by pluralization to obtain a copper loss reducing effect equal to or larger than a heavy line. Actually, a dead space between coils is reduced by line thinning, and a space factor is increased more than the heavy line, so that a copper loss can be reduced. A recess/projection of a coil surface is reduced due to a fine line, and ventilation resistance can be reeuced, so that efficiency of a motor-drivn blower 1 can be improved.
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