This study is based on drawings, specifications and information on the alternator as developed for the first prototype 60 KVA system. From the preliminary tests of the system, the alternator was required to produce 76.7 KVA at 76 % power factor to develop the rated system output of 60 KVA 95 % power factor. A major factor which limits the performance of the system is the commutating reactance of the alternator. High reactance causes the converter to dissipate more energy during its switching mode and also results in poorer voltage regulation. The alternator reactances are the result of the inductances of the stator windings and the mutual inductances developed between the stator windings and the rotor. Tests of the inductance of permanent magnet machines show that stators with rotors which have rare earth magnet poles such as the radial designs have only about one half the inductance of these same stators with rotors using conventional iron poles as required in the tangential concept. This data provides a basis for estimating the relative inductances expected for the radial design in comparison with the present tangential design. These factors and the other parameters previously developed in this report are summarized in Table IV.
New rotor concept for a 60 KVA permanent magnet alternator
Ein neues Konzept fuer den Laeufer eines permanentmagnet-erregten 400 Hz-Synchrongenerators mit variabler Drehzahl fuer Flugzeug-Bordnetze
Official proc. of the second int. motorcon conf. ; Mar ; 552-563
1982
12 Seiten, 8 Bilder, 4 Tabellen
Aufsatz (Konferenz)
Englisch
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