A Linear Synchronous-Motor Model for Evaluation of Sensorless Methods

In this work, a model for the long-stator linear synchronous-motor is derived. The purpose of this model is the evaluation of sensorless control methods. The model is composed by a magnetostatic and an electrical subsystem. The magnetostatic subsystem is derived by using the magnetic equivalent circuit (MEC) and is expressed as a set of implicit nonlinear algebraic equations. The electrical subsystem is coupled with the former and is expressed by a set of ordinary differential equations. The complete model is solved with a numerical method for differential algebraic equations (DAE). The MEC is derived from the motor geometry, magnetic characteristics of the involved materials, and the winding arrangement. This allows doing analysis and simulation of a motor before it is build. In this work, an existing long-stator synchronous-motor is modeled. First, the magnetostatic subsystem is compared with finite element analysis (FEA), and second, the complete model is validated with experimental results