| 摘要 |
A method for determining the rotating position of the drive shaft of a commutated direct current motor by evaluation the current ripple contained in the armature current signal, wherein the metered result of the detected current ripple is corrected when erroneous ripples or double ripples are present. According to the information, determination occurs after detection of a current ripple at a point in time kt t0 at a subsequent point in time or at several subsequent points in time t1...n, the time interval between each subsequent point in time t1...n and the point in time t0 of the previous detection of the current ripple being smaller than the period of the current ripple, whereby the angle of rotation which is set back from the moment t0 of detection of the current ripple is calculated on the basis of actual motor current data and motor characteristic data and, from there, the expected moment in time of the next current ripple detection is calculated. The metered current ripple result is corrected if the expected moment in time resulting from the calculation and the moment of real current ripple detection do not coincide with each other.
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