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Improved performance of motor-drive systems by SAW shaft torque feedback

By N Schofield, T M O'Sullivan, Chris Bingham and A Lonsdale


The paper describes the application of a non-contact, high bandwidth, low cost, SAW-based torque\ud measuring system for improving the dynamic performance\ud of industrial process motor-drive systems. Background to\ud the SAW technology and its motor integration is discussed\ud and a resonance ratio control (RRC) technique for the\ud coordinated motion control of multi-inertia mechanical\ud systems, based on the measurement of shaft torque via a\ud SAW-based torque sensor is proposed. Furthermore, a\ud new controller structure, RRC plus disturbance feedback\ud is proposed, which enables the controller to be designed to\ud independently satisfy tracking and regulation\ud performance. A tuning method for the RRC structure is\ud given based on the ITAE index, normalized as a function of\ud the mechanical parameters enabling a direct performance\ud comparison between a basic proportional and integral (PI)\ud controller. The use of a reduced-order state observer is\ud presented to provide a dynamic estimate of the load-side\ud disturbance torque for a multi-inertia mechanical system,\ud with an appraisal of the composite closed-loop dynamics.\ud The control structures are experimentally validated and\ud demonstrate significant improvement in dynamic tracking\ud performance, whilst additionally rejecting periodic load\ud side disturbances, a feature previously unrealisable except\ud by other, high-gain control schemes that impose small\ud stability margins

Topics: H600 Electronic and Electrical Engineering
Publisher: Sage Publications
Year: 2004
OAI identifier:

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