High Speed Generator Trade Study
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This document compares high temperature superconducting (HTS), permanent magnet (PM), and wound rotor (WR) designs of 5, 10, and 14 MW generators driven at 16,000 rpm, 7,000 rpm, and 7,000 rpm machines, respectively. The purpose is to identify power density trends vs. rating among the three options studied. Parametric analysis is used to design electrical generators optimized by weight. Different cooling strategies are considered to increase the slot current density. The results suggest that permanent magnet machines are best for weight at lower powers (< 8 MW) and higher speeds (> 10,000 rpm), but that wound rotor and HTS machines show superior power/weight ratios at higher power (> 8 MW) and lower speed (< 10,000 rpm). The HTS designs were lightest above 8 MW.