Electrical modeling approach and manufacturing of a new adjustable capacitor for medical applications

An adjustable capacitor generally consists in a stator and a rotor. The stator is made of the dielectric tube and the fixed electrode which is affixed in the outer. The rotor is the conductive body that acts as the variable electrode, and it moves axially in the housing. Furthermore, this entire structure is held together with a combination of screws, clips, soldering and other connection mechanisms. As a composed component, manufacturing time and cost increase. These capacitors are made for sharp domains that require their own conditions. These constraints need additional steps in the manufacturing process and increase the percentage of device failures, so this also drives down the profitability of the process.In order to create a new range of non-magnetic trimmers (adjustable capacitors) more performant to meet the Nuclear magnetic resonance (NMR) requirements, as MRI (Magnetic Resonance Imaging) applications, electrical modeling is an important step to improve empirical research results so to provide a high level of quality and to reduce manufacturing time and cost while.In this context ANSYS is used to design innovative electromechanical devices, simulate electrostatic performance of the component and then estimate a large number of trimmer parameters (material properties, capacitance value, breakdown voltage) and anticipate critical electrical effects (corona, point and edge effects).