A main field connection to connect to a main field winding has a semi-cylindrical portion with an axially thicker outer surface, an axially thinner inner surface, with an aperture. An extending portion extends from the semi-cylindrical portion to a remote extending end. The remote extending end extends for a first axial distance. The axially thicker portion of the semi-cylindrical portion extends for a second axial distance. A ratio of the first axial distance to the second axial distance is between 0.65 and 1.4. A rotating assembly, a generator and a method are also disclosed.

A rotating field machine (200) including a stator (140) and a rotor (150) are provided. In particular, a dual-winding rotating field machine (200) in which the stator (140) includes two separate windings can be provided. In one example implementation, the stator (140) can include an excitation winding (220) configured to control an excitation current and a power winding (230) configured to control power flow to an electrical system. The dual-winding rotating field machine (200) can further include a starting mode and a generating mode. During the starting mode, both the excitation winding (220) and the power winding (230) can be coupled to one or more switching power converters (170). During the generating mode, the power winding (230) can be coupled to a variable frequency bus and the power converter (170) can be used to manage excitation power only.

A rotating field machine (200) including a stator (140) and a rotor (150) are provided. In particular, a dual-winding rotating field machine (200) in which the stator (140) includes two separate windings can be provided. In one example implementation, the stator (140) can include an excitation winding (220) configured to control an excitation current and a power winding (230) configured to control power flow to an electrical system. The dual-winding rotating field machine (200) can further include a starting mode and a generating mode. During the starting mode, both the excitation winding (220) and the power winding (230) can be coupled to one or more switching power converters (170). During the generating mode, the power winding (230) can be coupled to a variable frequency bus and the power converter (170) can be used to manage excitation power only.

In a rotating electric machine, a rectifier includes a positive electrode side member including a positive electrode side rectification element connected to a power supply side, and a positive electrode side heat sink to which the rectification element is fixed. The positive electrode side heat sink is disposed to face a non-positive electrode side member having a potential difference with respect to the positive electrode side heat sink with a gap therebetween. An insulating cover provided to cover the rectifier has a wall portion extending in a direction in which the positive electrode side heat sink and the non-positive electrode side member are arranged. The wall portion functions as an easily deformable portion that, when the insulating cover is deformed by an external force, contacts with the non-positive electrode side member and enters the gap between the positive electrode side heat sink and the non-positive electrode side member.

In a rotating electric machine, a rectifier includes a positive electrode side member including a positive electrode side rectification element connected to a power supply side, and a positive electrode side heat sink to which the rectification element is fixed. The positive electrode side heat sink is disposed to face a non-positive electrode side member having a potential difference with respect to the positive electrode side heat sink with a gap therebetween. An insulating cover provided to cover the rectifier has a wall portion extending in a direction in which the positive electrode side heat sink and the non-positive electrode side member are arranged. The wall portion functions as an easily deformable portion that, when the insulating cover is deformed by an external force, contacts with the non-positive electrode side member and enters the gap between the positive electrode side heat sink and the non-positive electrode side member.

A rotor pack for a generator has an exciter rotor rotating with a shaft. A rectifier assembly is in electric communication with the exciter rotor to receive AC current and rectify the AC current into a DC voltage. Positive and negative busses extend from the rectifier assembly to a negative rail and a positive rail on a connection assembly. The negative rail is in contact with the shaft to provide a ground connection. The negative and positive rails are formed of a metal. The negative and positive rails are connected to a main field winding. A high speed generator is also disclosed.

A rotor pack for a generator has an exciter rotor rotating with a shaft. A rectifier assembly is in electric communication with the exciter rotor to receive AC current and rectify the AC current into a DC voltage. Positive and negative busses extend from the rectifier assembly to a negative rail and a positive rail on a connection assembly. The negative rail is in contact with the shaft to provide a ground connection. The negative and positive rails are formed of a metal. The negative and positive rails are connected to a main field winding. A high speed generator is also disclosed.

A rotating resistor assembly for use in a rotating shaft of an electrical machine can include a first housing configured to contact the rotating shaft and be grounded to the rotating shaft. The first housing can include a first bus bar connection aperture configured to receive a first bus bar. The assembly can include a second housing configured to connect to the first housing. The second housing can be configured to be insulated from the rotating shaft and to be insulated from direct electrical connection with the first housing. The second housing can include a second bus bar connection aperture configured to receive a second bus bar. The assembly can include a suppression resistor disposed between the first housing and the second housing and in electrical communication with the first housing and the second housing to provide an electrical pathway between first housing and the second housing.

A rotating resistor assembly for use in a rotating shaft of an electrical machine can include a first housing configured to contact the rotating shaft and be grounded to the rotating shaft. The first housing can include a first bus bar connection aperture configured to receive a first bus bar. The assembly can include a second housing configured to connect to the first housing. The second housing can be configured to be insulated from the rotating shaft and to be insulated from direct electrical connection with the first housing. The second housing can include a second bus bar connection aperture configured to receive a second bus bar. The assembly can include a suppression resistor disposed between the first housing and the second housing and in electrical communication with the first housing and the second housing to provide an electrical pathway between first housing and the second housing.

The distance measuring apparatus according to the present invention may comprise: a distance measuring unit; a motor; and a rotary wireless transceiver, comprising a rotor core rotated by the motor, a stator core, and power coils and signal coils respectively wound around the rotor core and the stator core, configured to wirelessly supply power to the power coil wound around the rotor core via the power coil wound around the stator core and wirelessly transmit the signal output from the distance measuring unit to the signal coil wound around the stator core via the signal coil wound around the rotor coil. The rotor core and the stator core may be in a shape of a circular plain such that the rotor core and the stator core face each other with a plane, perpendicular to a rotation axis of the motor, interposed between them.