Abstract: A generator rotor part for carrying at least one row of blower blades, each blade having a blade root. The rotor part has the form of a cylinder having a longitudinal axis and composed of at least one first portion having a first outer diameter and at least one second portion axially spaced from, and adjacent to, the first portion, the second portion having a second outer diameter which is less than the first diameter so that the first portion protrudes radially outwardly of the second portion and has a radially extending surface constituting a boundary between the first and second portions. The first portion is provided with a plurality of slots each extending from the radially extending surface and at a given angle of less than 90.degree. relative to the longitudinal axis of the rotor part for receiving and holding the root of a respective blower blade.

Abstract: Method and apparatus for providing electrical insulation and hydrogen leakage resistance functions required on a radial lead portion of a field winding assembly for rotors of hydrogen cooled turbine-generators. A glass cloth tube impregnated with an epoxy resin binder is machined to desired tolerances to provide a controlled interference fit over the radial lead conductor outer surface. A coating of the epoxy resin or insulating varnish may be brushed on the interface surface. The pre-machined insulating tube not only prevents hydrogen gas from entering the rotor bore area, but also electrically insulates the rotor field windings from the rotor shaft.

Abstract: A collector housing over the collector and brush assembly of a dynamoelectric machine is provided with a special valve called a vacuum breaker for permitting by manual operation the alleviation of negative pressure within the housing while the machine is in operation so that the collector housing may be rolled back from its normal location for inspection and maintenance of the collectors and brushes.