The purpose of this effort was to study analytically and experimentally the characteristics of permanent magnet synchronous machines when operated from a single phase source. On special interest was prediction of machine performance during startup and load application.;The majority of the analytical effort centered around the development of machine simulations. A 1-phase induction machine was studied in detail. Synchronization was studied for a 2-phase permanent-magnet motor running on 1 phase. Synchronization for this same motor was also studied assuming load connection via a "spring" type coupling. In addition to synchronization studies, a minor effort was undertaken to determine machine behavior during load application and removal. The machine studied in the sychronization effort was also analyzed in the load application/removal studies.;The experimental studies were accomplished on two different machines. The first of these was a 1-phase induction motor, the second was a commercially available 3-phase permanent-magnet synchronous motor. The latter was run both on 1-phase and 3-phase. The experimental results were compared with the analytical results for both motors. The 2-phase permanent-magnet machine which was studied analytically (as a 1-phase motor) was not available for test.;The theoretical aspects of the study centered on the simulation of AC machinery. A generalized technique was developed which permits simulation of unsymmetrical machinery. The technique allows for unbalanced stator voltages, stator voltages with arbitrary displacment angles, independent phase parameters, machine resistances which are functions of frequency, switching of phase voltages (opening and closing) as required and switching of starting circuits as functions of motor rpm. The simulations assume a uniform air gap and linear magnetic circuits. These two limitations could be removed from the simulation only at the expense of considerable complexity. Specific machine simulations which have been generated include the following motor types and operational modes: 1-phase capacitor start induction run, 1-phase induction start synchronous run permanent-magnet rotor, 3-phase induction start synchronous run permanent-magnet rotor, and 3-phase induction start synchronous run permanent-magnet rotor (run as 1-phase motor). In addition, load coupling via spring was studied for all the 1-phase and 3-phase permanent-magnet machines. The emphasis of the effort concerned the simulation of the 1-phase induction start synchronous run permanent-magnet rotor. However, the 3-phase induction start synchronous run permanent-magnet rotor (run on 1 phase) was simulated in an attempt to correlate the computed data with measurements on a commercially available permanent magnet motor.
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