In this study, we proposed governing equations for voice coil type linear actuator for valve operation. We draw up governing equations which are composed by combination of electromagnetic theories and empirical knowledge, and deduct the values of major design factors by use of them. We also made out the failure analysis data of linear actuator such as FMMA, FMECA, and 2-stage QFD considering the reference materials, field failure data, and the opinion of experts of linear actuator. And the test items were decided which are needed to evaluate the performance characteristics of linear actuator as analysis results of failure analysis data. We calculated the life test time of linear actuator for verification of reliability of the prototype. In addition, for reducing the life test time, the acceleration model of linear actuator is proposed and the acceleration factor is calculated considering the field operating conditions. Finally we have proven the propriety of the governing equations by accelerated life test using the valve assembly adopted the voice coil type linear actuator prototype.
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