Permanent Magnet Synchronous Reluctance Machines With Axially Combined Rotor Structure

Performance analysis of a hybrid ferrite IPM/SynR traction machine with axially combined rotor structure

“…However, since only reluctance torque is utilized, SynR machines are subject to low efficiency as well as low torque density, especially in the high-speed operation region, compared with PM machines [5]. Therefore, a hybrid rotor with axially combined rotor structure to exploit both advantages of PM machine and SynR machine is often employed [6]- [9] and this is the target of the paper. In [6] and [7], a two-part rotor concept including a surfacemounted PM (SPM) rotor part and SynR rotor part was presented.…”

“…It was demonstrated that due to the saliency characteristics of the SynR rotor part, better FW operation could be achieved. More recently, similar rotor structure has been employed in [8] and [9] where it was shown that a hybrid rotor could provide better performance than the conventional PM-SynR machine with similar machine specifications and operation conditions. In the paper, a hybrid rotor concept with axially combined structure of Ferrite IPM rotor and SynR rotor is presented and validate via FEA benchmarking by a high-speed high-power (12,000rpm and 80kW) Ferrite IPM traction machine.…”

On the Optimal Selection of Flux Barrier Reconfiguration for a Five-Phase Permanent Magnet Assisted Synchronous Reluctance Machine for Low-Torque Ripple Application

“…Although a three-phase system is widely applied to electrical machines, due to developments of power electronics devices, the necessity of having a limited number of phases dismissed and multiphase drive systems can be applied to supply and control electrical machines. A five-phase system can be used as the drive system in PMASynRM, which brings advantages as (i) higher torque, (ii) higher efficiency, (iii) reduction of DC-Link harmonics, and (iv) reliability [23][24][25][26][27][28][29]. Moreover, it has been investigated in [8] that while the 3-phase inverter fed Multiphase SynRM would not utilize the full capacity of kVA of the inverter, the multiphase system would provide higher usage of the inverter power.…”