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The First 400V 3 Level control inverter with IGBTs

Main Features:

• Reduced surge voltages
• Reduced bearing corrosion due to low bearing currents
• Reduced audible noise
• Reduced leakage currents

3-Level Control

Low Surge Voltages

• Switching the half DC bus voltage reduces surge voltages
• Motor winding insulation is stressed less
• Motor lifetime is lengthened
• No problems with older, bad insulated motors anymore

Low Electrical Noise

• Radiated Noises are reduced
• Reduced effects on peripheral devices

Low Motor Bearing Currents

• Reduced bearing currents
• Thus electrolytic corrosion is lowered
• Bearing lifetime is extended

Low Earth Leakage Currents

• Earth leakage currents are greatly reduced
• Effect on earth leakage circuit breakers is minimized
• No problems with long, shielded motor cables