Recently industry started to show interest on very high speed, high power drives. In designing this kind of drives several problem must be faced, both on the power converter and on the motor. ABB is now studying an experimental high power, high speed drive based on PM motor. One of the main problems in designing the drive is to supply the motor with a good voltage waveform from the harmonics point of view. One possible solution is to put a suitable passive filter between the power converter and the motor. In this paper three different solutions are described: a complete passive power filter, a decoupled control with passive filter and a sliding mode approach.