Design, Implementation, and Non-Linear Control of Interior Permanent Magnet Synchronous Motor with Flux Concentration by Improved PWM-Rotor Design

The design, implementation, and control of rotor topology for an interior permanent magnet synchronous motor (IPMSM) is presented in this paper. The method is an arrangement of buried magnets in a flux concentration structure, combined with Pulse Width Modulation (PWM), which act on the iron core of the rotor, known as the PWM-rotor. The unsatisfied harmonic contents of the flux density in the air-gap are reduced with this technique, and the total harmonics distortion (THD) of the back electromotive force (back-EMF) subsequently decreases. The design was chosen for a motor size of 350 W, 500 rpm, 36 slots stator lamination, and 12-poles. Moreover, a nonlinear control approach based on differential flatness properties is proposed for a vector control of the PMSM drive. Using the flatness property, we propose simple solutions to PMSM drive and stabilization problems. The design controller parameters are autonomous from the operating point; moreover, high dynamics in load torque disturbance rejection is achieved. To validate the proposed method, a hardware system was built, and digital estimation was accomplished with a dSPACE controller. Experimental and simulation results corroborate the excellence of the PMSM design and control scheme.