DRIVE SYSTEM, VEHICLE, AND METHOD

A drive system 100. The drive system 100 comprises: a main power supply 03; a converter 04, configured to receive power from the main power supply and provide a multi-phase driving current; a permanent magnet motor 08a, 08b, 08c, 08d, configure to receive the multi-phase driving current; one or more contactors 06a, 06b located between the converter and the permanent magnet motor, configured to selectively isolate the permanent magnet motor from the converter; a voltage sensor 07a, 07b, configured to sense a voltage between one or more pairs of phases of the multi-phase driving current at a position between the one or more contactors and the permanent magnet motor; and a controller 05, configured, whilst the one or more contactors are open, to receive the sensed voltage(s) from the voltage sensor and detect a short-circuit fault of the permanent magnet motor on the basis of the received sensed voltage(s).