| 摘要 |
A method for correcting the determination of the rotational position of a commutated d.c. motor drive shaft, by evaluating the current ripple contained in the armature current signal when double or missing ripples occur. The method is characterized by a first step wherein a spectral analysis of the armature current signal concerning the frequency components thereof is carried out. The actual frequency of the of the current ripple contained in the armature current signal, which occurs during operation of the d.c. motor and which has been obtained from the spectral analysis, is monitored to detect sudden changes in said frequency; and, if a sudden change in the actual current ripple frequency is detected, a correction of the current ripple meter reading is carried out.
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