Verification of a field theory analysis applied to a helical motion induction motor

Description is presented for a helical-motion induction motor (HMIM) that can be used in a tandem arrangement of two units to form a direct-acting, two-degree-of-freedom actuator capable of producing pure rotary motion, pure linear motion, or helical motion. With the use of field theory analysis, expressions for developed axial thrust and rotary torque are derived. Experimental data recorded from an operational model of the HMIM show excellent agreement with theoretically predicted values of thrust and torque. A tubular induction motor is described that is suitable for general helical motion with certain performance features superior to those of known machines that exhibit combined rotary and translational motion