... finite element analysis to optimize the design of the PM generator and reduce the start torque, and then the ... reduction box, generating high voltage at low speed.•High efficient PM generators, optimal design, compact structure, no carbon brush, ... 400VAC, 40Hz,3-phaseRated speed: 100rpmTorque: 4775NmCurrent: 125.5AEfficiency: 90%Weight: 1600kg 50kw 100RPM Permanent Magnet Motor for Wind Power Generator