Alternating Electric Machine Roles for Serial Driving

The patent implements periodic switching between two electric machines, alternating their roles as motor and generator. The control unit monitors temperatures and switches functions periodically to prevent continuous operation of one machine, thereby distributing thermal load and extending overall serial driving duration while maintaining vehicle propulsion.

The patent implements a functional switching mechanism where the first electric machine can be discarded from motor operation and recovered later. When the first machine overheats, it is switched to generator mode (discarded as motor), and the second machine takes over propulsion. Once the first machine cools down, its functions can be recovered by switching back, ensuring continuous reliability while maintaining propulsion power.

The patent segments the propulsion function between two electric machines rather than relying on one machine continuously. By dividing the workload and alternating their roles, the system maintains serial operation continuity while preventing thermal overload on any single machine, as each machine operates intermittently rather than continuously.

The patent ensures continuity of useful propulsion action by having two electric machines ready to alternate. When one machine reaches thermal limits during high-power operation, the system seamlessly transitions to the other machine, maintaining continuous driving force without interruption. This continuity principle ensures that high force can be sustained indefinitely by rotating between machines rather than being limited by single-machine thermal capacity.