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.