The IPMSMs are used in electric vehicles because of their intense power density. The high speed implies a significant electromotive force and requires flux weakening. The usual control algorithms realize flux weakening by adding a negative Id current component when the voltage required by the current regulation exceeds the maximum voltage. If the magnet can be totally defluxed then it is better to use a Maximum Torque Per Ampere (MTPA) strategy. Furthermore, there is no speed regulation in the control and the driver gives a torque reference. This reference value has to be limited by the attainable operating points therefore the battery power limit has to be taken into account in addition to the voltage and current limits. The d-q current references are calculated to minimize the total current magnitude required to reach the reference torque. Also, speed control loop with IP controller is also introduced to the system for speed regulation. This paper proposes a strategy MTPA-FW to control an IPMSM operating continuously, in order to take into account the different limitations (current, voltage, power) and to expand the over-speed zone. The feasibility of the system is confirmed by Simulink model, the results of which are presented in the end of paper.