一种伺服电机和弹簧相结合的混合驱动机构

A Hybrid Drive Merging a Servo-Controlled Motor and a Spring Mechanism

弹簧机构断路器在严酷的环境中可靠地运行了数十年,充分显示了弹簧机构的高可靠性能。伺服电机与弹簧机构相结合产生了一种混合驱动技术,这种机构具有伺服系统的精确性和自适应性的特点,也具有弹簧操动机构的高可靠性能。本文讨论了机构的发展历史及弹簧机构可改进的观点,概述了混合驱动机构的初步发展。文章重点描述机构可靠性,如要求机构在没有电源和外力的帮助下可靠地分合闸。文章给出了分析结果:混合驱动机构具有许多传统机构所没有的优点,但其价格相对昂贵。因此,混合驱动技术目前还不能成为发展的主流。但随着电子元件价格的降低,混合驱动机构与断路器相结合的优势将日益受到关注。

Spring mechanisms have demonstrated their high reliable performance by operating thousands of circuit breakers (CBs) safely all over the world for decades under the most severe conditions. This well-known technology could be improved, when merged with a servo motor system. The result is a hybrid drive, which offers the accuracy and flexibility of servomechanisms and the reliability of spring operating mechanisms. The paper starts with a reminder of the state of the art of operating mechanisms, followed by an overview of spring mechanisms with the aim of identifying potential improvements. The remaining part is dedicated to the first evolution of the hybrid drive. The architectural description emphasizes the reliability aspects, especially due to the application of redundant tripping circuits, allowing the tripping operation without either an auxiliary power supply or electronic support. Test results are discussed. The conclusion illustrates that if technical benefits are obtained, the cost of some critical components still remains high. The applications of such a hybrid technology are restricted today to specific applications. As the prices of electronic systems decrease with time and, hopefully, the cost of low inertia motors, the architecture of operating mechanisms could be dramatically modified and tightly merged with the CB. The advantages of hybrid drives could be decisive for the long-term future.