A method of determining the advanced angle of square-wave currents in a bearingless switched reluctance motor

Bearingless switched reluctance motors, which can control rotor radial posi tions with magnetic force, have been proposed. These motors have combined c haracteristics of switched reluctance motors and magnetic bearings. This pa per proposes a method of determining the advanced angle of square-wave curr ents in a bearingless switched reluctance motor. Under any torque condition from no load to full load, a stable operation is realized by controlling t he advanced angle of square-wave currents with the proposed method. It is s hown experimentally that the proposed method is effective in realizing a st able operation.