Further developments of the self-oscillating induction motor

Abstract

The self-oscillating induction motor described in an earlier paper, in which two linear motors placed back-to-back are capable of producing a stable amplitude of oscillation of a moving runner without any switching device, cannot be made to operate in small sizes without careful design. Among the possible applications of such a system a traverse mechanism for textile package winders appears to be the most attractive. One of the principal requirements of traverse mechanisms is that the oscillating member should be as small as possible.The paper describes the development of small self-oscillating motors of several types. In some of these the rotors or runners contain iron, while in others they consist of slabs of conducting material. The system is found to operate under transient conditions at all times, and it has not been possible to establish a complete theoretical analysis. Nevertheless, an experimental approach has indicated some of the rules by which a small oscillating motor may be designed. Rotors of the order of only 30 g mass have been made to oscillate successfully, and speeds of over 500 traverses/min over a 14 in length have been achieved with power input of the order of 100 watts.