Nowadays, the field of electric mobility is experiencing a rapid evolution. The need for more competitive electric vehicles is affecting the field of electric motor drive systems as well, placing the alternative types of electric motors into the center of research attention. The reluctance motors are one of these alternative motor types, but their highly nonlinear characteristics place a significant burden to their application. The stator inductances are varying in the function of the stator currents, and also in the function of the rotor position due to the magnetically asymmetric rotor structure. This means that the traditional calculation methods for the electromagnetic torque of the machine yield in inaccurate results. Therefore, this paper presents a novel, generalized coenergy-based torque calculation method, which eliminates a significant constraint of the traditional magnetic energy- and coenergy-based torque calculation methods, and considers the highly nonlinear behavior of the machine as well.