Innovations & references PM-drive system, consisting of low-maintenance poly-phase machine with permanent-magnet excitation and IGBT converter with DC bus up to capacities of 500kW.   Innovative: Motors with permanent-magnet excitation up to high capacities High dynamic due to low mass moment of inertia and fast reacting inverter Favorable system power efficiency (more than 92%) If required, 4Q inverter with sinusoidal line currents References: Use in test beds for high dynamic forces, such as test beds for transmission systems (vibration-resistant) or components (simulation of combustion engines) Extruder Conveyor systems SD-drive system, consisting of low-maintenance poly-phase machine and thyristor converter with current-source DC-link up to capacities of 400kW   Innovative: Heavy-duty drive system with high reliability Cost-efficient regeneration of the braking energy into the power supply Exact speed control without sensors on the motor shaft Moderate EMV-behavior System behavior like DC drives References: Use in test beds of any type, such as test beds for combustion engines, transmission systems or components Extruder drive Conveyor systems Presses