Patent ID: 10352957

Abstract:
A method for the improved speed determination of electric motors while taking into account angle errors of an angular position sensor is provided. A commutation sensor based on a magnetic rotary encoder, the angle signal of which has an angle-dependent and thus periodic angle error, is used. By differentiation, this defective angle signal is converted into a raw speed signal, which has two disturbance components. One disturbance component results from the angle error and is the disturbance waviness, which is periodic similar to the angle error. The second disturbance component is formed by a noise component superposing the raw speed signal. In order to correct the defective raw speed signal, half of the period duration of the raw speed signal must be ascertained. If this half of the period duration is ascertained two samples of the raw speed signal lying exactly one half of the period duration of the raw speed signal apart from each other are averaged. A speed signal having no disturbance waviness but rather only the noise component results from these method steps.