Double Rotor Synchronous Reluctance Machine: Analysis towards Torque Capability

Abstract

This paper presents a comparative analysis of double rotor synchronous reluctance machines. Different topologies of the proposed machine have been investigated, such as double rotor with double-sided stator and double rotor with single-sided stator machines. A comparison between these topologies has been conducted to understand the potential of improving the machine capabilities in terms of high average torque/power density, with respect to the conventional synchronous reluctance machine. The benefits of a double rotor topology are described in detail considering different number of stator slots. Furthermore, given the higher structural complexity with respect to a single airgap machine, a mechanical analysis of the inner and outer rotors has been conducted to assess the robustness of the inner and outer rotors iron ribs.

Novel Differential Evolutionary Optimization Approach for an Integrated Motor-Magnetic Gear Used for Propulsion Systems

“…Units DR-PMSM1 [9] DR-SynRM [10] DR-PMSM2 [11] DR-PMSG [8] DR-HESM [12] DR-FSSM [13] Coupling When dealing with dual rotor topologies, there is usually a magnetic connection between the rotating armatures and, rarely, a mechanical connection. In the first case, the flux on both rotors is controlled and affected by the stator's flux.…”

“…-A (first variant) permanent magnet synchronous machine (DR-PMSM1), [9], which has a magnetic coupling between the motor and the integrated MG, a good power density and efficiency (for the given power), but the power factor is poor. -A synchronous reluctance machine (DR-SynRM), [10], which uses both rotors to strengthen the torque, and thus, there is only one shaft (one level of speed and torque). -A (second variant) PMSM (DR-PMSM2), [11], having mechanical coupling and a high gear ratio, but for the given power, the efficiency is poor.…”