The purpose of the present invention is to provide an electric power supply system that is superior to conventional systems. This electric power supply system has a configuration in which: a fixed member 8 is provided with an inner conductor 9 arranged along the axial direction of the fixed member 8, an outer conductor 13 arranged along the axial direction of the fixed member 8 so as to cover the inner conductor 9, and a high-frequency conductive path dielectric 5 disposed between the inner conductor 9 and the outer conductor 13; a rotating member 7 is provided with an inner conductor 9 arranged along the axial direction of the rotating member 7, an outer conductor 13 arranged along the axial direction of the rotating member 7 so as to cover the inner conductor 9, and a high-frequency conductive path dielectric 5 disposed between the inner conductor 9 and the outer conductor 13; a high-frequency electric power source 27, the outer conductor 13 of the fixed member 8, the outer conductor 13 of the rotating member 7 and a load 26 are electrically connected so that it is possible to supply electric power from the high-frequency electric power source 27 to the load 26; and the fixed member 8 and the rotating member 7 are combined to form an electromagnetic wave attenuation structure for attenuating the electromagnetic waves emitted from the electric power supply system.

A connector assembly body has: on an end surface on an opposite side to an output side of a motor; a large-current connector of a power supply system, with large-current connector being disposed in the same direction as the motor output shaft; a small-current connector of a signal system, with the small-current connector being disposed in the same direction as the motor output shaft; and a component mounting section including at least one of a capacitor and a coil, and the large-current connector, the small-current connector and the component mounting section are disposed separately in respective regions.

A connector assembly body has: on an end surface on an opposite side to an output side of a motor; a large-current connector of a power supply system, with large-current connector being disposed in the same direction as the motor output shaft; a small-current connector of a signal system, with the small-current connector being disposed in the same direction as the motor output shaft; and a component mounting section including at least one of a capacitor and a coil, and the large-current connector, the small-current connector and the component mounting section are disposed separately in respective regions.

An electric direct current motor is disclosed which includes a shaft, a winding support, a collector having several collector wires, and an air-cored outer rotor winding with several winding terminations. The outer rotor winding is at one end connected to the shaft via the winding support in a torque-proof manner, and is electrically connected with the collector. The winding support can be replaced by a printed circuit board as a bearing component of glass-fiber reinforced thermosetting plastics, wherein the printed circuit board includes at least one layer and is connected to the shaft via a metal hub.

An electric direct current motor is disclosed which includes a shaft, a winding support, a collector having several collector wires, and an air-cored outer rotor winding with several winding terminations. The outer rotor winding is at one end connected to the shaft via the winding support in a torque-proof manner, and is electrically connected with the collector. The winding support can be replaced by a printed circuit board as a bearing component of glass-fiber reinforced thermosetting plastics, wherein the printed circuit board includes at least one layer and is connected to the shaft via a metal hub.

A rotor for an electric machine has a permanent magnet carrier that defines a plurality of permanent magnet receptacles. A plurality of permanent magnets are received in the receptacles. The magnets are arranged to define at least two magnetic poles of the rotor. A metallic shield surrounds an outward facing surface of the permanent magnets to shield the magnets from high frequency magnetic fields that would cause eddy currents, and thus magnet heating. The metallic shield is constructed from a metallic foil. A carbon fiber retaining sleeve surrounds an outward facing surface of the metallic shield. The carbon fiber sleeve is configured to retain the magnets to the permanent magnet carrier during operation of the electric machine. The permanent magnet carrier is interference fit over a rotor core.

An electric motor includes a stator and a rotor. The rotor includes a motor shaft, at least one radial fan and at least one axial fan being non-rotatably situated on the motor shaft for motor cooling. The radial fan is situated in the area of one axial end of the motor shaft and the axial fan is situated in the area of a diametrically opposed axial end of the motor shaft.

An electric motor includes a stator and a rotor. The rotor includes a motor shaft, at least one radial fan and at least one axial fan being non-rotatably situated on the motor shaft for motor cooling. The radial fan is situated in the area of one axial end of the motor shaft and the axial fan is situated in the area of a diametrically opposed axial end of the motor shaft.

An alternating current (AC) motor system includes an AC motor with a rotor and a stator with multi-phase AC stator windings. The system also includes a power inverter that generates a multi-phase AC voltage, an AC bus that connects the power inverter to the stator windings, an AC choke that surrounds the AC bus, and a current sensor with a coil wound on or surrounded by the AC choke. The current sensor measures common mode current in the AC bus, and is used in pulse width modulation or slew rate control of the power inverter, ensuring smooth operation and reducing the risk of damage due to common mode current.

An alternating current (AC) motor system includes an AC motor with a rotor and a stator with multi-phase AC stator windings. The system also includes a power inverter that generates a multi-phase AC voltage, an AC bus that connects the power inverter to the stator windings, an AC choke that surrounds the AC bus, and a current sensor with a coil wound on or surrounded by the AC choke. The current sensor measures common mode current in the AC bus, and is used in pulse width modulation or slew rate control of the power inverter, ensuring smooth operation and reducing the risk of damage due to common mode current.