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 6.5 ~ 16kwSingle-phase:Voltage 110 ~ 240v Power 4.3 ~ 10.8kw