In this paper, a model based on Fourier series is presented to predict value of flux density in airgap with respect to mechanical angle for double-stator, double-rotor reluctance motor (DSDRRM). The DSDRRM is an excellent choice to be used as the electric motor in hybrid electric vehicles (HEVs) due to integrating two rotors and two stators into a compact structure and robust structure but torque ripple in this type of machines is high then special and fast model is necessary to design that proposed model can help us to have fast design. Point to point components of radial and tangential for DSDRRM are shown in figures compared between proposed model and finite element analysis (FEA) that the approach can be used for the magnetic field calculation in DSDRRM with any combination of rotor- and stator-pole number eventually, after putting analytical outputs on numerical outputs, efficacy of proposed model is validated.