A motor structure includes a housing, a cover, an air collecting structure fixed to the cover, an air guiding shell mounted around the housing and the air collecting structure, and a cooling fan. The cover defines a plurality of inlet holes. The air collecting structure defines a plurality of through holes aligned with the inlet holes of the cover, so as to provide a path for allowing one portion of the air current generated by the cooling fan to enter the housing. The housing defines a plurality of inlet holes and a plurality of outlet holes. One portion of the air guiding shell is located above the inlet holes of the housing to form another path for allowing another portion of the air current to enter the housing.