| 摘要 |
<p>The invention relates to a method for determining the rotational position of the drive shaft of a commutated DC motor by evaluating the digitized current ripples contained in the armature current of the DC motor. The inventive method is characterized by continuously disposing the actual, digitally scanned anchor current values in a memory; comparing, when depositing an actual value in the memory, said value and a certain number of previously deposited values in the timewise order of their deposit with respect to their size, and generating, if there is an overall rising or an overall falling tendency across the values evaluated, an edge recognition signal representing a rising or a falling edge of a current ripple.</p> |
