Thin film senses magnetic flux and loss in rotary electric motors

The existing methods of measurement of the flux and loss distribution in the laminations of rotary electrical motor is to employ arrays of search coils made from 40 Standard Wire Gauge (s.w.g.) enamelled copper wire and arrays of miniature thermistors. These introduce unacceptable air gaps between laminations and consequently make the core building difficult. To overcome this drawback, thin film sensors have been deposited on electrical steel sheets which build up the stack of the core of a rotary motor