| 摘要 |
PURPOSE: A motor is provided to reduce the dimension of the motor in the direction of a rotor shaft and achieve a large torque. CONSTITUTION: A motor comprises a rotor having at least one flat surface divided in a rotational direction and alternately magnetized to opposite poles, a first coil having an inner peripheral surface opposing an outer peripheral surface of the rotor, a second coil having an outer peripheral surface opposing an inner peripheral surface of the rotor, first magnetic pole portions opposing the one flat surface of the rotor, formed from a plurality of teeth extending in a radial direction of the rotor, and excited by the first coil, second magnetic pole portions formed on an opposite side to the first magnetic pole portions via the rotor at positions opposing the first magnetic pole portions, third magnetic pole portions opposing the one flat surface of the rotor, formed from a plurality of teeth extending in the radial direction of the rotor, and excited by the second coil, and fourth magnetic pole portions formed on an opposite side to the third magnetic pole portions via the rotor at positions opposing the third magnetic pole portions.
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