Method for operating electric motor, control unit, piston pump

The invention relates to a method for operating an electric motor (1), in particular a piston pump (9), the electric motor (1) having a rotor shaft (3) and being controlled as a function of a power requirement with a target rotational speed (nsoll) and a target rotational direction for the rotor shaft (3), an actual rotational speed (nIst) of the rotor shaft (3) being monitored. The method according to the invention is characterized in that the target rotational direction is changed for a predetermined time period (t) when the actual rotational speed (nIst) is equal to zero and the target rotational speed (nsoll) is not equal to zero, and then the electric motor (1) is activated again with the target rotational speed (nsoll) and the target rotational direction. 本发明涉及一种用于运行电动机(1)、特别是活塞泵(9)的方法，其中，所述电动机(1)具有转子轴(3)并且根据功率要求利用用于转子轴(3)的目标转速(nsoll)和目标转动方向来驱控，其中，所述转子轴(3)的实际转速(nIst)被监控。根据本发明的方法的特征在于，在所述实际转速(nIst)等于零并且目标转速(nsoll)不等于零时在预定的时间段(t)内改变目标转动方向，并且然后再次以目标转速(nsoll)和目标转动方向驱控电动机(1)。