Patent ID: 7394672

Claim:
A drive system for a vehicle moving along a trackway, the drive system comprising: an electrical power supply outputting a first three-phase supply voltage; a converter unit having a stepping switch and an output transformer with a primary winding and a secondary winding and outputting a second three-phase output voltage, said converter unit connected to said electrical power supply for receiving the first three-phase supply voltage and converting it into a third three-phase alternating voltage of a predeterminable frequency and amplitude, the third three-phase alternating voltage being received by said primary winding of said output transformer, said secondary winding of said output transformer having taps which, in a transformer mode, being connected to and disconnected from said stepping switch for adjusting and correcting the second three-phase output voltage, each of said taps being connected in series between said secondary winding and said second three-phase output voltage by said stepping switch; and a linear motor having a stator extending along the trackway and receiving the second three-phase output voltage from said output transformer.