An electric machine (21) having a stator (20) and having a rotor (29) rotatably mounted to the stator (20) is specified. The stator (20) comprises a stator winding (24), at least three teeth (23), and at least three grooves (22). In each case, one tooth (23) of the stator (20) is arranged between two grooves (22) along a circumference of the stator (20), and the stator winding (24) has at least three coils (25), wherein each of the coils (25) is wound around a tooth (23) of the stator (20), so that the stator winding (24) is a concentrated winding. In addition, the winding direction of all coils (25) is the same, each of the coils (25) is designed to be fed with its own phase current, and the stator (20) is designed to generate at least two rotary fields having different numbers of pole pairs independently of each other, in particular simultaneously. In addition, an activation unit (40) for the electric machine (21) and a method for operating an electric machine (21) are specified.

An electric machine (21) having a stator (20) and having a rotor (29) rotatably mounted to the stator (20) is specified. The stator (20) comprises a stator winding (24), at least three teeth (23), and at least three grooves (22). In each case, one tooth (23) of the stator (20) is arranged between two grooves (22) along a circumference of the stator (20), and the stator winding (24) has at least three coils (25), wherein each of the coils (25) is wound around a tooth (23) of the stator (20), so that the stator winding (24) is a concentrated winding. In addition, the winding direction of all coils (25) is the same, each of the coils (25) is designed to be fed with its own phase current, and the stator (20) is designed to generate at least two rotary fields having different numbers of pole pairs independently of each other, in particular simultaneously. In addition, an activation unit (40) for the electric machine (21) and a method for operating an electric machine (21) are specified.

The disclosure relates to a rotor for an electrical machine, having a central rotor axis. The rotor includes a rotor carrier and at least one superconducting permanent magnet carried mechanically by the rotor carrier. The rotor further includes a magnetization device having at least one superconducting coil element which surrounds the superconducting permanent magnet and which is suitable for magnetization of the superconducting permanent magnet. Furthermore, an electrical machine including such a rotor and a method for magnetization of at least one superconducting permanent magnet of such a rotor are disclosed.

The disclosure relates to a high-speed electric machine, having a speed higher than 20,000 rpm, including a rotor having 1 or 2 pairs of magnetized poles, and an enhanced stator which has an outer diameter that is larger than 18 millimeters and which has 3 or 6 straight teeth extending radially and borne by a one-piece peripheral annular collar. At least a portion of the teeth bear coils, and the teeth are rigidly connected to one another and together form a one-piece planar assembly. The coiled teeth have a rectangular cross-section of width I and of length L, with formula (I).

The disclosure relates to a high-speed electric machine, having a speed higher than 20,000 rpm, including a rotor having 1 or 2 pairs of magnetized poles, and an enhanced stator which has an outer diameter that is larger than 18 millimeters and which has 3 or 6 straight teeth extending radially and borne by a one-piece peripheral annular collar. At least a portion of the teeth bear coils, and the teeth are rigidly connected to one another and together form a one-piece planar assembly. The coiled teeth have a rectangular cross-section of width I and of length L, with formula (I).

A rotor for an electrical machine includes a rotor core having a plurality of circumferentially spaced apart rotor poles. Windings are seated in gaps between circumferentially adjacent pairs of the rotor poles. A wedge secures the windings in each gap. The wedge includes a first member made of a first material and at least one second member made of a second material. The second material has a higher electrical conductivity than the first material. The wedge is configured to supply Q-axis damping. A pair of end plates is connected electrically to the at least one second member at opposing longitudinal ends thereof thereby completing a Q-axis winding circuit for each wedge.

A rotor for an electrical machine includes a rotor core having a plurality of circumferentially spaced apart rotor poles. Windings are seated in gaps between circumferentially adjacent pairs of the rotor poles. A wedge secures the windings in each gap. The wedge includes a first member made of a first material and at least one second member made of a second material. The second material has a higher electrical conductivity than the first material. The wedge is configured to supply Q-axis damping. A pair of end plates is connected electrically to the at least one second member at opposing longitudinal ends thereof thereby completing a Q-axis winding circuit for each wedge.

Provided is an armature structure of a three-phase motor which includes: 6N (N is a natural number) slots; 3N coils per phase; 3N main poles; and 3N auxiliary poles. In the armature structure of a three-phase motor, a coil wound around a winding bobbin inserted into the slot is wound around the main pole, the coil is not wound around the auxiliary pole, the main poles and the auxiliary poles are alternately placed, the winding bobbin includes a barrel portion and a flange portion, the barrel portion is in contact with a side surface in a circumferential direction of the main pole in the slot, the flange portion rises in the slot from the barrel portion along a first outer peripheral bottom portion of the slot, a side surface in the circumferential direction of the auxiliary pole, an outer peripheral surface of the coil, and a second outer peripheral bottom portion of the slot define a gap area that is not occupied by the coil, in the slot, and the second outer peripheral bottom portion is continuous to the first outer peripheral bottom portion, and extends in a direction intersecting the first outer peripheral bottom portion.

Provided is an armature structure of a three-phase motor which includes: 6N (N is a natural number) slots; 3N coils per phase; 3N main poles; and 3N auxiliary poles. In the armature structure of a three-phase motor, a coil wound around a winding bobbin inserted into the slot is wound around the main pole, the coil is not wound around the auxiliary pole, the main poles and the auxiliary poles are alternately placed, the winding bobbin includes a barrel portion and a flange portion, the barrel portion is in contact with a side surface in a circumferential direction of the main pole in the slot, the flange portion rises in the slot from the barrel portion along a first outer peripheral bottom portion of the slot, a side surface in the circumferential direction of the auxiliary pole, an outer peripheral surface of the coil, and a second outer peripheral bottom portion of the slot define a gap area that is not occupied by the coil, in the slot, and the second outer peripheral bottom portion is continuous to the first outer peripheral bottom portion, and extends in a direction intersecting the first outer peripheral bottom portion.

A self-excited brushless machine with compensated field windings includes a rotor and a stator. The rotor Includes a field winding secured to the rotor, an auxiliary winding secured to the rotor, and an energy converter associated with the rotor and configured to convert current between the field winding and the auxiliary winding. The stator includes a multiphase winding. The self-excited brushless machine uses a first current to generate a first magnetomotive force on a stator of the machine, and uses a second current to generate a second magnetomotive force. A third current is induced on auxiliary windings of a rotor of the machine using the second magnetomotive force. A rotor field winding of the machine is excited with the induced currents of the auxiliary windings.