METHOD AND APPARATUS FOR MEASURING MOMENT OF FRICTION OF AN ELECTRICAL MOTOR

摘要

Method and apparatus for determining the moment of friction exerted on the rotor of an electric motor (20). The motor is connected to a power source (23) for driving the rotor at a selected speed and is thereafter disconnected from the power source so as to allow the rotor to decelerate freely, without any external mechanical or electrical load. During the deceleration, successive speed samples of rotation of the rotor are measured at a plurality of time instants; and for any sample speed, the difference between each speed sample and a preceding speed sample is determined thus permitting calculation therefrom of a correspoinding value for the moment of friction.