Patent ID: 6920800
Filing Date: 2005-07-26
Classification: G01P,H02P

Abstract:
1. A method for estimating inertia of an electric motor, said method comprising: receiving a sensor signal from a sensor attached to the electric motor; changing a velocity of the electric motor from a first velocity to a second velocity; in response to the sensor signal, detecting a first rate of velocity change from the first velocity to the second velocity; detecting a first average amount of torque produced by the electric motor while the velocity is changing, wherein the first average amount of torque is detected by acquiring a plurality of torque samples while the electric motor is changing velocity, each torque sample represents an amount of torque generated by the electric motor, and calculating an average of the plurality of torque samples; and deriving an inertia value as a function of the first rate of velocity change and the first average amount of torque.