a conveyance system includes a machine having a motor ; a source of ac power ; a drive system coupled to the source of ac power , the drive system to provide multi - phase drive signals to the motor , the drive system including : a first drive having a first converter and a first inverter , the first convertor including a first positive dc bus and a first negative dc bus ; a second drive having a second converter and a second inverter , the second convertor including a second positive dc bus and a second negative dc bus ; wherein the first positive dc bus and the second dc positive bus are electrically connected and the first negative dc bus and the second negative dc bus are electrically connected .