25 The new industry of electric cars has led to the study and construction of axial flow electric motors. This type of motor, already known and used in niche sectors, lends itself particularly well to uses in electric mobility due to its particular features: high torque density and limited axial footprint. In traditional electric motors (radial flow), the rotor is concentric and located within the stator, and the driving torque is generated in the air gap between them. In axial flow motors, the rotor and stator lie along the axis of the machine and the driving force is generated at a greater distance from the axis than in radial flow motors. The result is a greater driving torque with the same diameter and length. The particular construction technology of axial flow motors also allows for different configurations of the stator (S) – rotor (R) coupling, from the simple S-R configuration to the more complex S-R-S or R-S-R. The limited axial footprint also allows for a cascade configuration of several stator-rotor groups along the machine axis, further increasing the torque and power. The rotor of an axial flow motor generally consists of a disc of ferromagnetic material equipped with permanent magnets, alternating the north-south polarity until a certain number of pairs are formed. The stator, on the other hand, consists of a cylinder of ferromagnetic material with slots to accommodate the stator windings. When an appropriate current passes through these windings, a magnetic field is generated and interacts with the magnetic field of the poles, causing the rotor to turn. Control electronics ensures the correct sequence of stator current pulses when the rotor is moving, as well as continuous rotation of the rotor disc and therefore the motor shaft. The particular technology used by O.M.E.M. to make the toroidal magnetic cores of amperometric transformers (wound core technology) is naturally also suitable for the production of rotors and stators in axial flow electric motors. Some construction considerations allow the toroidal core for the transformers to be perfectly adapted to the specific features required for use as rotor/stator discs in motors. For example, the rotor core has particularly smooth surfaces to allow the magnets to be applied effectively, and suitable mechanical characteristics to withstand the axial and radial stresses that arise during operation. The core to be used as a stator, however, must be machined to create the slots for the windings. With its wide range of ferromagnetic materials (ferrosilicon with non-oriented and oriented grains, in different thicknesses, and with magnetic qualities) and a long track record in the construction of magnetic toroids with wound core technology, O.M.E.M. provides cores for rotors and stators that meet the varied needs of manufacturers producing axial flowmotors.
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