Nowaday several motors, such as Permanent Magnet Synchronous Motor; are used for traction. These kinds of motors are better and simpler in view of efficincy, size, weight, and acceleration time and speed-torque control. If for these motors new versions of vector control has been applied, then they can be used in goals such as speed and torque control. The electric drive is a system that is used for motor control. Electric drive systems such as the other electrical systems are faced to system failures or disruptions which may sometimes impair their performance. When system drive fault is happend using fault detection and recovery is necessary. In this project, an adaptive speed controller is designed which can resist to fault when the speed sensor of the electric motor in hybrid electric vehicle fails. For reaching this goal at first, rotor speed is estimated by two virtual sensors (which are MRAS estimator and Back_EMF observer) then speed is measured with a real sensor compared with the estimated speed. To reconfigure system when a sensor fault occurs in the system, the desinged fault tolerant system will switch to drive motor in sensorless mode. Keywords: Permanent Magnet Synchronous Motor (PMSM), Model Reference Adaptive System(MRAS), Speed Sensor, Fault Tolerant Control(FTC)
