Permanent-magnet synchronous motors (PMSM) are widely used in industrial appliances, wind and aerospace applications and also in electrical vehicles. This motor presents better effciency, higher power density, less weight and volume than other machines for the same power. The electrical characteristics of the motor are nonlinear and require the application of nonlinear control techniques (or linear ones by linearizing the dynamics) to regulate the speed, the position or the torque of the machine. Moreover, the encoder used to measure the position or the speed is quite expensive and observers are usually needed. In this project, we study different control techniques applied to a PMSM for regulating the speed of the machine. Matlab simulations are used to compare the behaviors obtained with the different controllers. 2019/2020