Permanent magnet rotors for electric motors, particularly electric motors for use in compressors, improve the electromagnetic efficiency of the motor. The rotors can include retention of surface permanent magnets using one or more of retaining features on the motor and/or pole spacers interfacing with corresponding features on a rotor core, the use of a monolithic magnet in the rotor, and/or use of a carbon fiber sleeve. The rotor can include an eddy current shield, disposed on the rotor core, on a surface of the rotor, or located within a sleeve surrounding the rotor. The rotor can be sized such that an air-gap between the rotor and a stator of a motor using the rotor is a predetermined amount that reduces electromagnetic losses such as eddy current losses.

A motor rotor may include a body having axially extending first and second magnets embedded into the body, the first magnet and the second magnet being arranged at an angle and spaced apart by an axially extending magnetic shielding component. The first magnet includes a first surface away from a central axis of the rotor body and a second surface facing the central axis. The second magnet includes a third surface away from the central axis and a fourth surface facing the central axis, wherein the first surface and the third surface and extension surfaces thereof define a first area of the body part away from the central axis and a second area of the body part close to the central axis.

A screening system for a magnetic rotary-encoder sensor system in an environment of a machine including a magnetic noise field, wherein the rotary-encoder sensor system comprises a magnetic sensor, a pole wheel, and preferably a pole-wheel carrier, wherein the pole wheel comprises in a circumferential direction a plurality of permanent magnets of alternating magnetic polarity generating a useful field, wherein the pole-wheel carrier is configured to be mounted in a rotationally-fixed manner to a rotating machine shaft extending axially, rotational speed and/or angular position of which is to be determined by means of the rotary-encoder sensor system, wherein the magnetic sensor is positioned, in a mounted state of the rotary-encoder sensor system relative to the machine shaft, in a rotational plane of the pole wheel, which can affect the noise field, and directly opposite to the pole wheel, wherein the screening system comprises at least one magnetically conducting, preferably machine-fixed, deflection element being formed and dimensioned such that in the mounted state a measuring volume, which is substantially free of the noise field, is established, to which the magnetic sensor, and such ones of the permanent magnets are at least adjacent which are required for generating an evaluable useful field, when the noise field is active.

Permanent magnet rotors for electric motors, particularly electric motors for use in compressors, improve the electromagnetic efficiency of the motor. The rotors can include retention of surface permanent magnets using one or more of retaining features on the motor and/or pole spacers interfacing with corresponding features on a rotor core, the use of a monolithic magnet in the rotor, and/or use of a carbon fiber sleeve. The rotor can include an eddy current shield, disposed on the rotor core, on a surface of the rotor, or located within a sleeve surrounding the rotor. The rotor can be sized such that an air-gap between the rotor and a stator of a motor using the rotor is a predetermined amount that reduces electromagnetic losses such as eddy current losses.

The invention relates to a rotor (5) for an electric machine (1) having a central rotor axis (A). The rotor comprises a rotor carrier (7), at least one superconducting permanent magnet (9) carried mechanically separately by the rotor carrier (7), and a damper shield having at least one shielding element (13a, 13i), which surrounds the at least one superconducting permanent magnet (9) and which is formed from an electrically conductive material having an electric conductivity of less than 30.Math.10.sup.6 S/m. The invention further relates to an electrical machine (1) having a rotor (5) of this kind.

A rotor includes an assembly hub intended to be fixed to a shaft, a plurality of permanent magnets which are supported by the assembly hub, and a binding band holding the plurality of permanent magnets in place. The binding band includes crossed windings of reinforcing fibers arranged around the plurality of permanent magnets. Preferably, the rotor further includes a retaining sleeve formed of a unidirectional winding of a reinforcing fiber arranged around the binding band.

An object of the present disclosure is to provide a rotating electric machine in which a centrifugal force can be relaxed and reluctance torque can be improved. A pair of magnet slots are provided so as to be opposed to each other such that the distance therebetween is narrowed toward the radially inner side while being centered on a d axis of a rotor core, a pair of magnets are inserted in the pair of magnet slots, and center flux barriers are provided on the d axis between the pair of magnet slots. The distance in the radial direction between the first-layer center flux barrier and the second-layer center flux barrier is the smallest among distances between a flux barrier layer for first layer and a flux barrier layer for second layer.

An electric machine including an annular armature assembly and a non-rotating annular field winding assembly coaxial with the armature assembly and separated by a gap from the armature assembly. The field winding assembly including a field coil support structure having an annular array of recesses formed therein and extending about the field coil support structure. The field winding assembly further including a plurality of superconducting coils, each disposed in a recess of the annular array of recesses. A generator and a method for generating electrical power are disclosed.

A slip ring bridge, in particular for use in a wind power installation, includes at least two segments configured to provide electrical power, and an insulation element configured to insulate the segments to maintain the segments in spaced-apart relationship. The insulation element includes a shield arranged inside the insulation element and connected to a constant electric potential.

An armature is presented. The armature includes an armature winding having a plurality of coils, wherein each coil of the plurality of coils is spaced apart from adjacent coils and comprise includes a first side portion and a second side portion. The armature further includes a first electrically insulating winding enclosure. Furthermore, the armature includes a second electrically insulating winding enclosure disposed at a radial distance from the first electrically insulating winding enclosure, wherein the armature winding is disposed between the first electrically insulating winding enclosure and the second electrically insulating winding enclosure. Moreover, the armature includes an electrically insulating coil side separator disposed between the first side portion and the second side portion of the plurality of coils of the armature winding. A superconducting generator including the armature and a wind turbine having such superconducting generator are also presented.