Wound Rotor to Induction Motor and VFD Conversion Case Study

This paper will present a method, which has been used to retrofit vintage wound rotor motors in various applications in the forest products industry. This calculation method was developed due to the end user´s need to retrofit an existing application and the lack of detailed motor data. Specifically, the author will present a case study from an actual project, which was commissioned two years ago. The author will present general background of the application, obstacles to overcome in the retrofit process, calculations, motor application recommendations, and postretrofit site data.