1, self-motivation control, 2.automatic voltage regulator system 3, single and double bearing options Self-stimulation control, automatic voltage regulator system, 2 / 3 winding pitch effectively eliminate the third harmonic, standard IP protection. Single and double bearing options.Three-phase: Voltage 380 ~ 600v Power 9.6 ~ 25kwSingle-phase:Voltage 110 ~ 240v Power 6.7 ~ 16.5kw