Electric motor.

摘要

An electric motor includes a housing (10), a rotor (12) and a stator (14). The rotor (12) includes a rotor shaft (16) rotatably supported on the housing (10). The rotor (12) includes a plurality of disk portions (14) disposed on the rotor shaft (16) coaxially therewith and spaced from each other axially of the rotor shaft (16). Each of the disk portions (14) has a thickness gradually decreasing radially outwardly thereof. The stator (14) includes a plurality of annular portions (30) disposed on the housing (10) coaxially with the rotor shaft (16) and spaced from each other axially of the rotor shaft (16). Each of the annular portions (30) has a thickness gradually decreasing radially inwardly thereof. The annular portions (30) and the disk portions (14) are loosely fitted with each other with a gap formed therebetween. Opposed side surfaces of the annular portion (30) and disk portion (14) are conical. Each of the annular portions (30) has a coil (32) disposed in each conical side surface thereof. Each of the disk portions (24) has permanent magnets (28) disposed at least in each conical side surface thereof.