Investigation of a three-phase flux-switching permanent magnet machine for downhole applications

This paper investigates a newly designed flux-switching permanent magnet machine with 12 stator poles and 14 rotor poles for downhole application where the ambient temperature is around 150°C. This machine having an outer diameter of 100 mm and an active axial length of 200 mm can provide ~2.7 kW with an output torque up to 25 Nm, an efficiency of ~88% and power factor of 0.87. The maximum temperature in the machine is around 200°C without external cooling. Additionally, the machine losses, inductance and magnet demagnetization field are also studied.