A novel chaotic-speed single-phase induction motor drive for cooling fans

This paper presents a novel chaotic-speed control of single-phase shaded-pole induction motor drives, especially for application to cooling fans. It is the firstly proposed and implemented chaotic-speed fan. Based on the d-q axis model of the shaded-pole induction motor drive, Poincare mapping and hence bifurcation analysis are conducted to reveal the periodic and chaotic operations under different system parameters. Consequently, a chaotic-speed fan can be achieved by properly choosing either the motor´s own parameters or the operation condition such as the frequency and amplitude of the applied voltage. Theoretical analysis, computer simulation and experimental results are given to testify the proposed chaotic-speed fan.