Patent ID: 7893636

Claim:
A mobile machine, comprising: one or more generator units; a plurality of electric propulsion motors; a power-transfer system operable to transfer electricity from one or more of the generator units to one or more of the electric propulsion motors; and power-system controls that control the connection of the one or more electric propulsion motors to the power-transfer system, including, while supplying electricity to the plurality of electric propulsion motors to propel the mobile machine: selectively using a first motor-connection strategy for controlling when one or more groups of the electric propulsion motors are connected to the power-transfer system in series, wherein using the first motor connection strategy includes selectively switching between series connection and parallel connection of one or more of the electric propulsion motors, and selectively using a second motor-connection strategy for controlling when one or more groups of the electric propulsion motors are connected to the power-transfer system in series, wherein using the second motor connection strategy includes selectively switching between series connection and parallel connection of one or more of the electric propulsion motors.