Método para medir a potência elétrica de um motor elétrico universal, dispositivo eletrônico, utensílio elétrico doméstico, e, produto de software

摘要

A method of measuring the electric power of a universal electric motor (4) connected to an electric power mains (6) by a Triac (7) and supplied by sinusoidal alternating voltage (V(t)), the method determining a first ( ton ) and a second ( toff ) instant at which the current (I(t)) supplied to the motor (4) passes from a zero value to a value other than zero; measuring the current supplied to the motor (4) at a third instant between the first ( ton ) and second ( toff ) instant; determining a fitting current time pattern (f(t)) approximating the real time pattern of the current (I(t)), and which has a zero current value at the first ( ton ) and second ( toff ) instant, and a current value equal to a sampled current at the third instant ( tin ); and calculating the mean electric power on the basis of the fitting current time pattern (f(t)).