A chaotic PWM motor drive for electric propulsion

In this paper, a chaotic Pulse width modulation (PWM) closed-loop induction motor drive is proposed and implemented to improve the electromagnetic compatibility (EMC) for electric propulsion. The key is to propose a chaotically amplitude-modulated frequency modulator (CAFM) to modulate the space vector PWM (SVPWM), in such a way that the CAFM-SVPWM scheme is proposed for the vector controlled induction motor drive. By designing the CAFM properly, the proposed CAFM-SVPWM scheme can not only decrease the peaky electromagnetic interference (EMI) but also avoid the mechanical resonance in induction motor drives. Thus, it affords better spectrum performance than the fixed frequency PWM and random frequency PWM induction motor drives. Also, the proposed chaotic PWM induction motor drives could provide good steady-state as well as transient operating performance for electric propulsion. Both simulation and experimental results are given to verify the validity of the proposed chaotic PWM motor drives.