Method for maintenance of a transportation device, software program, and controller

Abstract

This invention relates to a method for maintenance of a transportation device propelled by an electric motor, wherein an incremental encoder senses motion of a moving part of or a part moved by said electric motor, wherein a motor model is used in control of said electric motor, wherein said method comprises: acquiring a pulses-per-rotation configuration value PPRconf, representing a number of pulses which should be provided by the incremental encoder per one rotation of the electric motor in normal operation; deriving a pulses-per-rotation estimation value PPRest representing a number of pulses per one rotation of the electric motor, based on motor model information of the electrical motor control; determining a pulses-per-rotation error value PPRerr representing a deviation of the pulses-per-rotation estimation value PPRest from the pulses-per-rotation configuration value PPRconf, based on the relation: PPRerr=PPRest−PPRconf or PPRconf−PPRest or PPRest/PPRconf or PPRconf/PPRest; and utilizing the pulses-per-rotation error value PPRerr for establishing a maintenance information indicating that a maintenance should be done on the transportation device. Other aspects are a software program realizing the method, and a controller for controlling a transportation device.

Dependencies are inferred from the claim text.