Miniature heat-dissipating fan device

A miniature heat-dissipating fan device, comprising:

• a frame;
• a shaft, pivotally connected to the frame;
• at least a planar coil, each being received in the frame and formed in a wave winding manner;
• at least a permanent magnet, each being connected to the shaft while being positioned about parallel to the at least one planar coil for enabling the generation of an alternating multipolar magnetic field;
• a plurality of blades, being disposed in a manner that each is coupled to the at least one permanent magnet so as to rotate with the at least one permanent magnet synchronously;
• and
• at least a magnetically permeable back iron, each being disposed at a side of the at least one planar coil and being structured with a geometrical shape matching to the wave winding planar coil;
• wherein the planar coil comprises at least one layer of coil being wound on a same level, and on such level, said layer is formed by a plurality of turns of coil which is formed by continuous wire wound symmetrically around the radial center of the planar coil, each turn of coil has a plurality of convex pole portion and corresponding concave pole portion, the convex pole portion and the corresponding concave pole portion consists of a arc section and two line sections, the center of the arc section is the radial center which is also the center the two line sections radially pointing to virtually, and each line section is common-owned by the adjacent convex pole portion and concave pole portion.