Abstract: A position, speed and displacement speed detector for a continuous reference element (2) is described that is constituted by a pair of polar search elements (1A, 1B), comprised of magnetic sheets having longitudinal teeth (10A, 10B) distributed along its face turned to the continuous reference element (2). The polar search elements further comprise a winding (3A, 3B) which, when fed with a pre-established current, generates a magnetic field. The voltage generated in that coil is a function of the permeability measured by the polar search element (1A, 1B) and, accordingly, is a function of the relative position between the teeth of the pair of polar search elements. By reading the coil voltages and through the device for identification of the direction and relative displacement speed of the teeth of the pair of polar search elements and reference element, the position, direction and displacement speed are identified.

Abstract: A sub-synchronous reluctance electrical machine having a stator provided with a core comprised of an assembly of magnetically uncoupled or weakly coupled sectors of ferromagnetic plates having longitudinal teeth arranged on the face thereof turned towards the rotor and provided with grooves to respectively house a winding. This winding is comprised of a plurality of coils surrounding a respective sector of the ferromagnetic material of stator in a properly distributed manner, so as to generate a magnetic field whenever this winding is energized. The sub-synchronous reluctance electrical machine possesses as an integral part thereof said rotor which in turn is provided with a core of magnetic plates having longitudinal teeth uniformly arranged along the face thereof turned towards the stator, said teeth being in a number different from the number of teeth of the stator.