Torque Ripple Suppression in Three-Phase Doubly-Fed Machine for Wireless Power Transfer in Integrated Drives

Rotary assembly platforms are commonly used in the packaging industry. One of the problems that the designers have to solve is how to transfer power to auxiliary actuators mounted on a rotating disk. The preferred solution is to avoid sliding contacts to improve the system reliability and minimize maintenance costs. To achieve this result, a three-phase doubly-fed induction machine can be used to independently control the motion of the rotating disk and the power delivered to the rotating loads of the platform. In any operating condition, the independent control of the power transfer and the torque can be achieved by adding a pulsating component to the machine flux. This article focuses on the analysis and minimization of the torque contributions generated by the machine due to the interaction between the low and high frequency of the flux contributions. Experimental results confirm the feasibility of the proposed solution to improve the torque quality and the accuracy of the drive.