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 23.2 ~ 37.5kwSingle-phase:Voltage110 ~ 240v Power 16 ~ 24.8kw