Disclosed is an ultra-micro voice coil motor based on Micro-Electro-Mechanical System (MEMS) three-dimensional coil. The ultra-micro voice coil motor based on MEMS three-dimensional coil comprises a yoke, where an accommodating cavity is formed in the yoke, and a tongue is arranged in the accommodating cavity of the yoke; and two permanent magnets symmetrically arranged at a top and a bottom of the accommodating cavity; the three-dimensional coil is provided with an iron core slot, and the tongue of the yoke passes through the iron core slot to be in clearance fit with the three-dimensional coil; one end of the yoke is provided with a baffle, same poles of two magnets face each other, and a stator of the voice coil motor is the three-dimensional coil or the yoke and the permanent magnets.

A rotor for an electric machine, wherein the electric machine includes a stator and the rotor, which is rotatable relative to the stator. The rotor includes a plurality of permanent magnets and a first rotor portion, which is formed from a first material having a first magnetic permeability. The first rotor portion includes at least one sub-portion of the rotor facing the stator in an operationally ready state of the electric machine. The permanent magnets are arranged at least in part in the first rotor portion. The rotor also includes a second rotor portion, which is formed from a second material having a second magnetic permeability which is lower than the first magnetic permeability. The second rotor portion includes a sub-portion of the rotor facing away from the stator in the operationally ready state of the electric machine.

A rotor for an electric machine, wherein the electric machine includes a stator and the rotor, which is rotatable relative to the stator. The rotor includes a plurality of permanent magnets and a first rotor portion, which is formed from a first material having a first magnetic permeability. The first rotor portion includes at least one sub-portion of the rotor facing the stator in an operationally ready state of the electric machine. The permanent magnets are arranged at least in part in the first rotor portion. The rotor also includes a second rotor portion, which is formed from a second material having a second magnetic permeability which is lower than the first magnetic permeability. The second rotor portion includes a sub-portion of the rotor facing away from the stator in the operationally ready state of the electric machine.

A soft magnetic composite comprising an iron or iron alloy ferromagnetic material coated with an oxide material. An interface between the ferromagnetic material and the layer of oxide contains antiphase domain boundaries. Two processes for producing a soft magnetic composite are also provided. One process includes depositing an oxide layer onto an iron or iron alloy ferromagnetic material by molecular beam epitaxy at a partial oxygen pressure of from 1×10.sup.−5 Torr to 1×10.sup.−7 Torr to form a coated composite. The other process includes milling an iron or iron alloy ferromagnetic material powder and an oxide powder by high-energy milling to form a mixture; compacting the mixture and curing in an inert gas atmosphere at a temperature from 500° C. to 1200° C. to form a soft magnetic composite.

A soft magnetic composite comprising an iron or iron alloy ferromagnetic material coated with an oxide material. An interface between the ferromagnetic material and the layer of oxide contains antiphase domain boundaries. Two processes for producing a soft magnetic composite are also provided. One process includes depositing an oxide layer onto an iron or iron alloy ferromagnetic material by molecular beam epitaxy at a partial oxygen pressure of from 1×10.sup.−5 Torr to 1×10.sup.−7 Torr to form a coated composite. The other process includes milling an iron or iron alloy ferromagnetic material powder and an oxide powder by high-energy milling to form a mixture; compacting the mixture and curing in an inert gas atmosphere at a temperature from 500° C. to 1200° C. to form a soft magnetic composite.

A permanent magnet material is based on a manganese-aluminum alloy which further includes scandium. A method for producing such a permanent magnet material as well as the use of the permanent magnet material for producing a permanent magnet and for producing an electric motor and/or an electric power generating device are also described. Moreover, an electric motor including the permanent magnet material, an electric power generating device including the permanent magnet material, and an aircraft including the permanent magnet material or the electric motor or the electric power generating device are also described.

A permanent magnet material is based on a manganese-aluminum alloy which further includes scandium. A method for producing such a permanent magnet material as well as the use of the permanent magnet material for producing a permanent magnet and for producing an electric motor and/or an electric power generating device are also described. Moreover, an electric motor including the permanent magnet material, an electric power generating device including the permanent magnet material, and an aircraft including the permanent magnet material or the electric motor or the electric power generating device are also described.

A stator defines multiple stator poles with associated electrical windings. A rotor includes multiple rotor poles. The rotor is movable with respect to the stator and defines, together with the stator, a nominal gap between the stator poles and the rotor poles. The rotor poles includes a magnetically permeable pole material. The rotor also includes a series of frequency programmable flux channels (FPFCs). Each FPFC includes a conductive loop surrounding an associated rotor pole. The stator and the rotor are arranged such that the electrical windings in the stator induce an excitement current within at least one of the FPFCs during start-up.

A stator defines multiple stator poles with associated electrical windings. A rotor includes multiple rotor poles. The rotor is movable with respect to the stator and defines, together with the stator, a nominal gap between the stator poles and the rotor poles. The rotor poles includes a magnetically permeable pole material. The rotor also includes a series of frequency programmable flux channels (FPFCs). Each FPFC includes a conductive loop surrounding an associated rotor pole. The stator and the rotor are arranged such that the electrical windings in the stator induce an excitement current within at least one of the FPFCs during start-up.

A rotor including a shaft mounted around an axis of rotation; a laminated core mounted coaxially on the shaft, the laminated core extending between a front side face and a rear side face. It includes first internal cavities, a plurality of permanent magnets housed inside the first internal cavities, a front flange in the form of discs and arranged on either side of the laminated core. The shaft is provided with an internal inlet channel for circulating a coolant. The front or rear flange is configured to form, with the front or rear side face, at least one front outlet channel or rear outlet channel inside which a coolant is circulated. The front or rear outlet channel connected to the inlet channel opens at an outlet opening at the outer periphery of the front flange or rear flange.