The existing methods of measurement of the flux and loss distribution
in the laminations of rotary electrical motor is to employ arrays of s
earch coils made from 10 Standard Wire Gauge (s.w.g.) enamelled copper
wire and arrays of miniature thermistors. These introduce unacceptabl
e air gaps between laminations and consequently make the core building
difficult, To overcome this drawback, thin film sensors have been dep
osited on electrical steel sheets which build up the stack of the core
of a rotary motor.