... No excitation control-box, Small size, light weight, high energy density, High efficient generators. Optimization design. The structure is compact, no ... cooling or water cooling, low temperature, adopts high speed oil-contain bearings, maintenance-free, high reliability, long life.You can change the ... -18954868820,86-0538-5076117,5076118,FAX: 86-0538-5076111 High Efficient Permanent Magnet Generator