Double star PM machine. Mathematical modelling, simulation and control

The thesis work presented deals with electrical machine with phases greater than 3 and this thesis is presented especially with the approach to mathematically model a ‘Double Star Electrical Motor’. Double star machine has two sets of the phase winding that are mechanically displaced with thirty degrees. In the current era the development in power electronics technology let us to develop more and more multi-phase machine owing to their great benefits in great power supply with a relative less machine size. This thesis work is on a double star permanent synchronous motor. The thesis first part is about the introduction of multiphase machine, why they are becoming more and more given emphasis. The second part is about the step by step approach to mathematically model the double permanent magnet synchronous motor. The modular mathematically modelling approach can be applied to other multiphase machine then the one being considered in this project. The mathematical modelling involves many machine concept, along with linear algebra, since the double star permanent magnet synchronous motor has magnetic coupling between two winding sets and the rotor. The model also refers to a 9x9 induction matrix. Later the closed loop form of double star Permanent Magnet Sychronous Machine ( PMSM) is formed so that the mathematical model can be simulated. The simulation of this model is done in Simulink. Many custom build level-2 sfunction are being used in order to realize the mathematical model being presented in this thesis. Later the PWM control strategy is presented for this double star PMSM that deals both with the starting of motor and then during normal torque operation.