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A complete model characterization of dual three-phase permanent magnet brushless machine for electromechanical servoactuation

This paper looks at the requirements and challenges of designing the Dual Three-Phase Permanent Magnet Brushless Machine (DTPPMBLM) for the driven electromechanical servoactuator (EMA) for aerospace applications. The main goals of the design are a high level of actuator integration in order to minimize weight and volume, fault tolerance, and high reliability. This paper addresses the modeling problem associated with DTPPMBLM with uniform air gaps that operate in a range where magnetic saturation may exist. The mathematical model includes the effects of reluctance variations as well as magnetic saturation to guarantee proper modeling of the system. An experimental procedure is developed and implemented in a laboratory environment to identify the electromagnetic characteristics of the DTPPMBLM in the presence of magnetic saturation. It is demonstrated that the modeling problem associated with this class of the DTPPMBLM can be formulated in terms of mathematically modeling a set of multidimensional surfaces corresponding to the electromagnetic torque function and the flux linkages associated with the machine phase windings. The accuracy of the mathematical model constructed by the developed method is checked against experimental measurements.