Abstract: In order to minimize stresses on a circular rotatable permanent magnet attached to a shaft in a dynamoelectric machine, the shaft of the machine is provided with a circular support portion having an outer supporting surface and a shoulder at one end wherein a shouldered ring secured to the support portion cooperates with the shoulder on the support member to axially retain the magnet on the shaft. Rotational slippage of the magnet on the shaft is prevented by a pin which is engaged with both the magnet and the shouldered ring or, alternatively, by a key inserted between the support portion and the magnet. A flexible material is interposed between the supporting surface and the magnet in order to reduce vibration and motion of the magnet on the shaft.

Abstract: In an aircraft ground proximity warning system that compares the rate of descent of an aircraft with its altitude above the terrain and in response thereto generates a warning signal when the aircraft's sink rate exceeds a predetermined limit for a particular altitude, a first type of advisory voice warning is generated for combinations of lesser descent rates and greater altitudes and a second type of imperative voice warning is generated for greater sink rates at lower altitudes where the danger of the aircraft impact with the terrain is more significant. In addition, the repetition rate of the advisory warning is increased as a function of increasing descent rate and the amplitude of the advisory warning can similarly be increased as function of increasing descent rate in order to call attention to an increasing undesirable operating condition.