Synchronous design frequency as a free variable in permanent magnet brushless motors in effort to achieve optimal torque density

An axial flux dual-stator internal-rotor permanent magnet brushless motor design study is presented, where the synchronous design frequency is allowed to vary without bound. To achieve optimum or near-optimum torque density for any fixed volume, it is shown that certain useful ratios within the motor remain relatively unchanged, and are reasonably independent of the estimates of parasitic losses. This allows early accurate design choices greatly reducing iteration during later computationally intensive design steps.