Electric fan with multiple selection of oscillating angles

An electric fan with multiple selections of oscillating angles comprising:

• a fan body including a plurality of vanes connected to a fan shaft;
• a fan motor including a transmission shaft and a fixing portion, with the transmission shaft connected to the fan shaft for driving the fan shaft and the vanes to rotate;
• a motor support connected to the fixing portion of the fan motor;
• and
• an oscillating device mounted in a housing and including:
• a rotational shaft having an end connected to the motor support for driving the motor support to oscillate,
• a transmission gear including an axle and a gear wheel mounted around the axle, with the axle connected to the rotational shaft,
• a synchronous motor including an output gear meshed with the gear wheel,
• an oscillating angle limiting switch detecting a rotational angle of the rotational shaft and the gear wheel and sending a signal indicative of the rotational angle of the rotational shaft and the gear wheel,
• a circuit board including a processor coupled to the oscillating angle limiting switch and receiving the signal, with the circuit board storing data for a plurality of preset rotational angles, with a comparing program being stored in the circuit board for comparing the rotational angle indicated by the signal with a selected one of the plurality of preset rotational angles, and a driving program being stored in the circuit board for driving the synchronous motor when the rotational angle indicated by the signal is equal to the selected one of the plurality of preset rotational angles, and
• a printed circuit board mounted to a bottom of the rotational shaft, the fan motor including a power cord divided into an upper section and a lower section, with a brush mounted on top of the printed circuit board, and the upper and lower sections are respectively and electrically connected to the printed circuit board and the brush.