| 摘要 |
A method for driving an asynchronous motor operated at an adjustable three-phase frequency to a predetermined target rotational speed is disclosed. For controlling the asynchronous motor in an operating range around its breakdown point a current rotational speed of the asynchronous motor is determined at predetermined intervals and the three-phase frequency is adjusted stepwise such that the current rotational speed lies within a predetermined maximum rotational speed deviation of an updated three-phase frequency.
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