In modern industrial testing, energy recovery, and power electronics, Back-to-Back Motor technology has become an important approach for efficient testing and energy-saving applications. Compared to traditional mechanical load testing methods, back-to-back motor systems enable more precise and energy-efficient testing and control through closed-loop energy flow between a motor and a generator. This technology is widely used in motor testing, inverter validation, electric vehicle (EV) powertrain evaluation, renewable energy applications, as well as in high-end manufacturing industries such as aerospace.