A hybrid induction motor includes a fixed stator, an independently rotating outer rotor, and an inner rotor fixed to a motor shaft. In one embodiment the outer rotor includes spaced apart first bars and permanent magnets, and the inner rotor includes spaced apart second bars. In another embodiment the outer rotor includes angularly spaced apart first bars but no permanent magnets, and the inner rotor includes permanent magnets and may also include angularly spaced apart second bars. The outer rotor is initially accelerated by cooperation of a rotating stator magnetic field with the first bars. As the outer rotor accelerates towards synchronous RPM, the inner rotor is accelerated to transition to efficient synchronous operation. The outer rotor thus acts as a clutch to decouple the inner rotor from the rotating stator magnetic field at startup and to couple the inner rotor to the rotating stator magnetic field at synchronous speed.

An induction machine with integrated magnetic gears is disclosed. The machine comprises two rotors and two stators. An outer stator has ferromagnetic material, producing a rotating magnetic field with a defined number of pole pairs synchronized with a supply frequency. A high speed rotor has ferromagnetic material and a combination of rotor bars and permanent magnet pole pieces selected so that the permanent magnet pole pieces do not interact with the outer stator magnetic field. The high speed rotor rotation is asynchronously coupled to the outer stator magnetic field. An inner stator has ferromagnetic steel segments that modulate the field produced by the high speed rotor permanent magnets. A low speed inner rotor has ferromagnetic material and permanent magnet pole pieces, the low speed inner rotor counter-rotating to the high speed rotor. The low speed inner rotor is synchronously coupled to the high speed rotor using modulation harmonics.

A hybrid motor includes an induction motor and a synchronous motor combined. The hybrid motor includes a hollow rotor that includes conductor bars configured to form an annular shape at a position spaced apart from a rotation axis by a predetermined first distance and a synchronous motor equivalent that is disposed in an annular shape at a position spaced apart from the rotation axis by a predetermined second distance, an induction stator that includes induction stator windings positioned on a first radial side of the hollow rotor, and a synchronous stator that includes synchronous stator windings positioned on a second radial side of the hollow rotor.

A hybrid motor includes an induction motor and a synchronous motor combined. The hybrid motor includes a hollow rotor that includes conductor bars configured to form an annular shape at a position spaced apart from a rotation axis by a predetermined first distance and a synchronous motor equivalent that is disposed in an annular shape at a position spaced apart from the rotation axis by a predetermined second distance, an induction stator that includes induction stator windings positioned on a first radial side of the hollow rotor, and a synchronous stator that includes synchronous stator windings positioned on a second radial side of the hollow rotor.

The invention described herein belongs to the category of electric motors and power generators and may be used, in particular, to generate electric and mechanical energy. The objective of the invention described herein is to expand the area of application, to reduce costs and to increase the specific power and efficiency of the electric machines. This electric machine comprises a rotor and a stator with winding coils and a control device. Stator winding coils are made as a system of radial and/or tangential coils connected in series and/or back-to-back; each coil has its own electric terminals. The control device can connect its electric contacts to the terminals of the corresponding stator winding coils in order to provide a chain control of electric current supply to the corresponding stator coils and thus to create, at each point in time, a pre-determined stator magnetic field in the electric machine, whether a rotating or a reciprocating one, depending on the spatial position and the magnetic condition of the rotor that performs rotating or reciprocating motions. The invention can be applied in the power industry, the transport industry, mechanical engineering, the construction industry, astronautics, and other fields of technology. 4 independent claims; 4 drawings.

A method for producing a coated component consisting of transparent or opaque fused silica comprises a method step in which a SiO.sub.2 granulation layer is applied to a coating surface of a substrate, which in the area of the free surface has a relatively great granulation fine fraction. Starting from this, in order to achieve a smooth, preferably also dense surface layer, it is suggested according to the invention that the application of the SiO.sub.2 granulation layer comprises (i) providing a dispersion containing a dispersion liquid and amorphous SiO.sub.2 particles which form a coarse fraction with particle sizes ranging between 1 m and 50 m and a fine fraction of SiO.sub.2 nanoparticles having particle sizes of less than 100 nm, wherein the solids content of the dispersion is between 70 and 80 wt.-%, and of which between 2 wt.-% and 15 wt.-% are the SiO.sub.2 nanoparticles, (ii) applying the dispersion to the coating surface by casting or spraying it thereonto so as to form a slurry layer having a layer thickness of at least 0.3 mm; and (iii) drying the slurry layer by removing the dispersion liquid at a rate and in a direction such that under the action of the dispersion liquid being removed the fine fraction is enriched in the outer portion of the granulation layer, thereby forming a casting skin.

A method for producing a coated component consisting of transparent or opaque fused silica comprises a method step in which a SiO.sub.2 granulation layer is applied to a coating surface of a substrate, which in the area of the free surface has a relatively great granulation fine fraction. Starting from this, in order to achieve a smooth, preferably also dense surface layer, it is suggested according to the invention that the application of the SiO.sub.2 granulation layer comprises (i) providing a dispersion containing a dispersion liquid and amorphous SiO.sub.2 particles which form a coarse fraction with particle sizes ranging between 1 m and 50 m and a fine fraction of SiO.sub.2 nanoparticles having particle sizes of less than 100 nm, wherein the solids content of the dispersion is between 70 and 80 wt.-%, and of which between 2 wt.-% and 15 wt.-% are the SiO.sub.2 nanoparticles, (ii) applying the dispersion to the coating surface by casting or spraying it thereonto so as to form a slurry layer having a layer thickness of at least 0.3 mm; and (iii) drying the slurry layer by removing the dispersion liquid at a rate and in a direction such that under the action of the dispersion liquid being removed the fine fraction is enriched in the outer portion of the granulation layer, thereby forming a casting skin.

An electric machine may include a stator and a rotor that is rotatably mounted about an axis of rotation. The rotor has an internal rotor core provided with at least one electric coil winding. The rotor core and the coil winding are radially enclosed by an external rotor casing, the greater part of the perimeter of which is composed of a soft magnetic material.

A method for synchronizing a high inertial load with a line-start synchronous motor involves providing a rotor core with rotor bars being formed of a highly conductive material. In accordance with one aspect of the method, a user is directed to operatively couple a load to the motor and drive the load from start to at least near synchronous speed during steady state operation of the motor with the load coupled thereto. The load has an inertia that is greater than an inertia associated with a load driven by a like motor subjected to an equivalent range of starting current but having rotor bars formed from a conductive material having a conductivity lower than that the highly conductive material.

A method for synchronizing a high inertial load with a line-start synchronous motor involves providing a rotor core with rotor bars being formed of a highly conductive material. In accordance with one aspect of the method, a user is directed to operatively couple a load to the motor and drive the load from start to at least near synchronous speed during steady state operation of the motor with the load coupled thereto. The load has an inertia that is greater than an inertia associated with a load driven by a like motor subjected to an equivalent range of starting current but having rotor bars formed from a conductive material having a conductivity lower than that the highly conductive material.