Developments in the performance and theory of segmental-rotor reluctance motors

摘要: The paper describes some of the improvements that have been achieved, both experimentally and theoretically, in reluctance motors with purely segmental rotors. These result from incorporating a shallow axial channel centre air-gap face each segment, filling this conducting material, shaping ends segments optimisation significant design parameters. It is shown that, when synchronising duties are light, maximum pullout torque machine can exceed breakdown equivalent induction (so its power considerably exceeds machine) factors better than 0.8 possible. Careful attention given to asynchronous-performance characteristics, particular reference synchronisation load inertias two three times rotor inertia (the most usual values). found pullin powers greater 90% induction-motor full-load up 0.74 Of considerable importance, particularly connection thyristor-invertor supplies, fact starting currents low—about four current. Efficiencies may be expected, even relatively small machines. development on theoretical side includes (a) generalisation earlier results include effects in, end of, magnetic segments, (b) elimination, through consideration harmonics permeance potential, need for an empirical factor calculation quadrature-axis reactance. Stator-winding considered, but it their small. also losses due generation high-frequency Calculated measured values reactances synchronous-performance characteristics agree very closely over whole range performances claimed here fully confirmed by tests commercial approximately 10hp rating.