Patent ID: 7851956

Claim:
An electric motor with a low number of revolutions for providing torque, said electric motor comprising: a rotor powered by three-phase alternating voltage; a series of magnets made from ferrous material; and a coil forming a stator, in which said rotor and said stator have the same number of magnetic poles; said coil of said stator being powered by direct voltage, and the frequency of the rotor voltage being variable so as to vary the acceleration and deceleration conditions of said motor and to obtain a predetermined number of rpm of said motor in order to achieve a constant speed; said rotor, said stator and said magnets being enclosed in a pulley casing which rotates around a fixed shaft, said rotor being fixed to said pulley casing; said electric motor further comprising a fixed protective guard fitted with a series of brushes connected to respective rings rotating with said pulley casing, and electrically connected to a three-phase rotor windings of said rotor; said pulley casing presenting a series of peripheral slots designed to accommodate drive cables and being flanked by a pair of plates made from diamagnetic material; and wherein said electric motor further comprises an electromagnetic brake consisting of a pair of metal discs and discs-pushing springs, one of said discs being integral with one of said diamagnetic plates and the other of said discs being integral with the magnet which produce the poles of the stator, and said disc-pushing springs being located in appropriate slots cut in said magnet integral with said disc, the two ferromagnetic discs have respectively: one disc has a circular slots having a trapezoidal section, the other disc has one circular protuberance having a section partially formed by circle arches.