based onvoltage model (7) and (8). Since (5) and(6) do
not involve the rotor speed w,, it may be regarded as a
reference model; (7) and (8), involve w,. , may
when the motor speed is 650r/min at no load. In Fig.5
the measured rotor speed and the estimated rotor speed
are presented. Fig.6 shows the estimated rotor flux.