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Radar System Engineering

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SEC. 14.3] DIRECT-DRIVEN ALTERNATORS 559<br />

For loads approaching 1 kw, particularly in the case of systems with<br />

heavy current demands, weight savings can be appreciable if 3-phase<br />

generation is employed. NO saving in transformer weight is usually so<br />

v-<br />

. .—____ .-. .<br />

“’ --xl<br />

FIG. 14.2.—Eclipse NEA-7 dual-voltage generator.<br />

FIG.143.-General Electric dual-output gear box and generators for 3-phase a-c radar power<br />

and aircraft d-c supply.<br />

obtained, but the alternator is lighter or more reliable, and filters for the<br />

higher ripple frequency are appreciably smaller and lighter. In one<br />

specific case, a 3-phase power supply furnishing 3-kw direct current<br />

showed a saving of almost 70 lb over the equivalent single-phase unit.

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