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In a brushless generator having an exciter rotor (18) which generates an AC voltage that is rectified to provide a DC field for a main generator rotor (16), the rectifiers are mounted to revolve with the rotor and be fluid and conductively cooled to provide a dynamo operative without brushes, slip r

In a brushless generator having an exciter rotor (18) which generates an AC voltage that is rectified to provide a DC field for a main generator rotor (16), the rectifiers are mounted to revolve with the rotor and be fluid and conductively cooled to provide a dynamo operative without brushes, slip rings or commutators. The rectifier is formed by a diode assembly (24) including layers of insulating and conducting material that are mounted concentrically on the inside wall of a hollow rotor shaft (20) so that diode chips are stressed only in compression due to centrifugal forces of rotation. An input driven shaft (32) may be accommodated interiorly of the diode assembly (24) along the axis of the hollow rotor shaft (20). The dynamo electric machine may also be operated as a brushless motor.

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A brushless self-excited cooled dynamo electric machine comprising: a main dynamo unit with a rotating DC field producing structure mounted on a hollow shaft, said unit being energized by an exciter dynamo unit having a rotor mounted on the hollow shaft and producing an alternating current; means fo

A brushless self-excited cooled dynamo electric machine comprising: a main dynamo unit with a rotating DC field producing structure mounted on a hollow shaft, said unit being energized by an exciter dynamo unit having a rotor mounted on the hollow shaft and producing an alternating current; means for supplying a coolant to the interior of said hollow shaft; means for rectifying the alternating current to a direct current for supplying current to said DC field comprising a diode assembly including a first annular insulation layer positioned adjacent an internal peripheral surface of the hollow shaft, a first layer of conductive material composed of at least two electrically isolated segments supported by said first insulation layer, a second annular layer of insulation material concentric and supported by said first layer of conducting material which contains openings at spaced locations, a plurality of diodes positioned in the openings of said second layer of insulation material, said diodes each having a cathode surface and an anode surface with some of the diodes having a cathode surface in contact with said first conductive layer and others of said diodes having an anode surface in contact with said first conductive layer, a second layer of conductive material composed of two segments, one segment contacting exposed anode surfaces and one segment contacting exposed cathode surfaces of said diodes whereby stress due to centrifugal force tends to hold the layers together and compress diode chips to reduce the likelihood of diode breakage; and wherein said layers are mounted as concentric laminates extending around a periphery of an inner wall of said hollow shaft.