Hybrid Resonant Induction Machine for High-Speed Applications

Resonant induction machines are introduced to operate at high rotational speeds. The benefit of utilising the series resonance principle to induction machines comes from applying high currents with low voltages at high speeds. However, high voltage requirement at low frequencies is the main disadvantage of this machine. Therefore, the acceleration and deceleration of the machine are limited due to the high voltage requirement at these frequencies. A combination of the conventional induction machine and resonant induction machine topologies is presented in this paper to improve the practicality of the resonant induction machine. An asymmetrical six-phase induction machine is utilised to enhance the acceleration and deceleration of the machine. The six-phase machine consists of two isolated three-phase winding sets where the first winding set is connected to three capacitors in series with the winding set's phases. The other winding set is connected to the inverter terminals directly. Indirect rotor-field oriented control is utilised to control the proposed machine, where vector space decomposition is used to achieve the machine's speed control. A Simulink model is developed to validate the proposed machine topology and control scheme.