Mechanical Strength Analysis of Pulsed Alternator Air-Core Rotor

Abstract

As a high-speed, high-energy rotating machine, a compulsator is subjected to a high centrifugal force and large mechanical shocks during discharge. The use of composite material components fabricated by filament winding significantly improves the compulsator's performance. However, the composite components' relatively low radial and shear strength pose problems from a mechanical stability viewpoint. This paper presents a mechanical strength analysis for a compensated pulsed alternator (CPA) rotor with a bowl-shaped support. The mechanical model of the rotor was established. From the interior to the exterior, the rotor was divided into the bowl-shaped support, composite yoke, field winding, and composite banding. The radial and tangential stress distributions of the composite yoke were determined using analytical methods. The composite yoke and banding were fabricated using filament tension winding and modeled using the multiring interference fit analytical method. The interference fit for each layer was calculated and the mechanical analysis of the CPA rotor during discharge is presented. Two bowl-shaped carbon fiber epoxy resin supports were analyzed and compared.