What are metadyne and stroboscope?

A metadyne is a direct current electric machine used as an amplifier or rotary transformer. It contains an additional set of brushes on the d-axis (direct axis) which are used to give the output while brushes of q-axis (quadrature axis) are short-circuited. This type of arrangement permits armature MMF to achieve higher power gains.

A Metadyne is also used to convert constant voltage input into the constant current but variable voltage output. In technical terms, it defines as "Metadyne is a cross-field DC machine that is designed to use armature reaction".

A Stroboscope is also known as a strobe tachometer or strobe light which is used to estimate the revolution velocity and frequency of rotating, vibrating or moving parts, components, and equipment. It is easy to adjust the flash frequency to get an accurate analysis of the parameter. Stroboscope is used for the plant to find and replace springs, worn belts, valves and dampers as a component of a manufacturer's condition monitoring or preventative maintenance plan. Moreover, it is used to adjust machinery to streamline or enhance performance.