The motors drive his electrical charging system. The motors are engaged electrically only during braking, and act as generators, supplying an important amount of energy to his batteries. Any system with a motor can use this principle. Sure, most of the time it is more trouble than it is worth, but with the new proliferation of micro-power embedded systems, it makes sense to at least consider regenerative braking for each DC motor. The load could be a rechargable battery.
Conclusion Think green when designing embedded systems.
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