An algorithm for calculation of partial derivatives of flux associated to current and rotation angle of an electric motor with permanent magnets in the rotor and with a three-phase stator excitation

In the paper an algorithm for calculation of partial derivatives of flux associated to current and rotation angle of an electric motor with permanent magnets in the rotor and with a three-phase stator excitation. Because Psi is a nonlinear vector function, whose values are calculated on the basis of magnetic field using a specialized piece of software, the analytic calculation of partial derivatives is related to certain diffuiculties and necessity to carry out a numberof additional calculations. Simulation-based calculations have been carried out for the motor IPMSg132 S4 BLDC. The results have been presented in the form of charts. (An algorithm for calculation of partial derivatives of flux associated to current and rotation angle of an electric motor with permanent magnets in the rotor and with a three-phase stator excitation)