The iron loss is the second component of the Brushless motor that is needed to determine the efficiency of the Brushless motor. Iron Loss goes into the no-load current of the motor. The motor will be running when the no-load current of the motor is present. No load current is needed to make it in running status.
The hysteresis gives the losses which generate a no-load current. In the bearing, eddy current in the iron code and the mechanical losses are found. The no-load current is generated when the motor starts rotating.
At this pace, we can make sure that the bearings and any other mechanical elements that can move the motor are going to be considered.