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Interior permanent magnet synchronous motors (IPMSMs) are attractive in hybrid electric vehicles (HEVs) because of the high efficiency and ability to operate in the field- weakening mode for extended speed range. In HE V application, under a driving schedule, the traction motor has to operate in both the constant-torque and constant-power regions due to the wide speed range. This paper aims to improve the IPMSM control technique in both aforementioned regions and maintain the ability to change between them quickly, by considering all factors affecting it such as the dc-link voltage, battery pack and electric motor maximum permissible currents, motor speed, and torque request. The maximum torque per ampere (MTPA) and field-weakening control techniques are chosen in the constant-torque and constant-power regions respectively. Thereafter, the proposed control technique is used to examine the IPMSM performances under city as well as highway driving conditions. [ABSTRACT FROM AUTHOR]