Modeling and control of permanent magnet motor with finite elements software

This study presents a finite element modelling of surface mounted permanent magnet motor (SMPM). And torque is controlled by using field oriented control (FOC). Geometrical and material properties of a 1.5 kW industrial motor has been used in the modelling. This model is verified in three stages comparing real motor electrical plate ratings. Four stages have been used to reach the model of the industrial motor with its driver. As a first step, the model is simulated as FE based software without any driver. The advance angle required to obtain the maximum torque in the simulation environment is determined at this stage. Secondly, the model is simulated by embedding in MATLAB/Simulink using simulink plug-in software. In the third phase, the motor is simulated with modified voltage by adding an inverter model that uses space vector controlled pulse width modulation (PWM). In the fourth stage, field oriented control simulation using PI controller was performed. It is important that the finite element based model, which is popular in electric motor design studies, is implemented in the MATLAB / Simulink environment. In this application, the average torque value can be adjusted by the current Iq, which is the torque component of the SMPM (Surface Mount Permanent Magnet) motor. This control application is important to demonstrate the controllability of the motor model. In the first three simulations, the supply voltage amplitude value was adjusted to obtain values close to the motor plate values. However, the full load torque of 7.16 Nm which is given in the motor plate is obtained at 4.5 A rms in the last simulation instead of 8.3 A rms. The reason for the low current is that the remenance values of the magnets and winding connection structure can not be detected completely. In addition, losses were not considered in this study. The half-load torque-current values obtained with the drive software are compared with the simulation results. In addition, current, voltage, position and torque curves obtained at different speed and loading conditions are analyzed.