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It has a maximum operating speed of 9000 rpm, with a power output of 160 kW (nominal 85 kW) and a torque output of 520 Nm/384 lb-ft (nominal 190 Nm), for a package weight of 29 kg. The PHI301 is a central-rotor, surface-mounted, permanent magnet, axial flux machine, and is one of a family of Phi-Power motors that share this topology. The PHI301 motor shown on these pages was developed to be suitable for a wide range of applications and is in fact used in the Johnston Sweepers EVIE street sweeper detailed on page 48. One proponent of axial flux technology is Dr Michael Lamperth, founder of Swiss company Phi-Power, which produces a range of axial flux motors that have seen use in vehicles ranging from off-highway earth-movers to motorcycles. One of the main stumbling blocks for axial flux machines has been the high cost of producing the rotor and stator components, but developments in manufacturing technology have gone a long way to negating that. It is a topology which in recent years has seen increased adoption in many e-mobility applications, with the arrival of a number of companies producing motors that fulfil both traction and auxiliary drive functions.Īxial flux machines are by no means a new invention, in fact some of the first electric motor designs were axial flux units, but for various reasons they failed to see widespread adoption in the same way as radial flux machines. Something of the new kid on the block in the world of electric machines is the axial flux motor. Lawrence Butcher investigates the technology and engineering behind this compact but powerful motor design. Axial flux motors have seen increasing adoption across the e-mobility industry