Stiffness analysis of the opening process in a high-voltage circuit breaker spring mechanism based on flexible body impact dynamics

As power systems demand higher breaking speeds and market-driven cost control intensifies, drive mechanisms are evolving toward higher speeds, increased complexity, and reduced weight. Among these mechanisms, laminated spring systems offer advantages such as lightweight design and low cost, making them increasingly prevalent in circuit breaker drive systems. However, traditional design methods based on static strength criteria and the “dynamic load factor” often fail to meet modern engineering requirements. In contrast, dynamic design approaches that consider structural dynamic characteristics and actual dynamic load responses are increasingly being adopted. This paper employs flexible body impact dynamics to analyze the performance of a specific laminated spring mechanism, calibrating the simulation model using experimental amplitude test data. By accurately assessing the product’s stiffness, this study provides valuable insights for product design and optimization, reducing development costs and shortening the research and development cycle.