Patent ID: 6469412
Filing Date: 2002-10-22
Classification: H02K

Abstract:
A universal electric motor with a variable air gap, said motor having a rotor presenting one tooth or multiple circumferentially equidistant teeth mutually separated by grooves, and a stator provided with an excitation system, wherein said excitation system comprises, mounted consecutively distanced on a stator support facing said rotor: at least one electromagnet composed of an armature and a winding; a control circuit provided with a position detector for controlling the supply of power to said electromagnet; and a permanent magnet, wherein said electromagnet and said permanent magnet are fastened onto said stator support for alternatively exciting said rotor, and at least one of said electromagnet and said permanent magnet is fastened in a manner to be in a position that is adjustable on said stator support to vary the distance between said electromagnet and said permanent magnet in order to change the direction of rotation of said rotor.