Patent ID: 8581532
Filing Date: 2013-11-12
Classification: B66B,F04B,H02P

Abstract:
1. A method in connection with a motor drive comprising a frequency converter, wherein the motor of the drive is connected to a load, the motor is controlled with the frequency controller and the motor drive is configured to be controlled by a user, wherein the method comprises the steps of: at least one of measuring and estimating a value of at least one electrical quantity of the motor; forming at least one intermediate signal by at least one of scaling, filtering, and other means of processing the value; forming observations from the intermediate signal, wherein the observations represent changes in the at least one electrical quantity caused by user actions affecting a load; selecting control symbols on the basis of matching sequences of observations with a set of valid patterns representing the user actions to be recognized; and controlling the frequency converter on the basis of the selected symbols.