Device for driving an electronically commutated motor

摘要

In the case of a device for driving an electronically commutated power motor that is operated on d.c. voltage, with an electronic driving module (12) exhibiting a power ground (PGND) and an electronic ground (EGND), the power ground (PGND) is connected to a ground terminal (Kl.31) via a low-resistance measuring shunt (22) for measuring the motor current. In order to prevent the high-frequency current ripple generated by the switched transistors (20) from feeding across to neighbouring circuit components and being radiated in interfering manner via the connecting leads of the motor, the electronic ground (EGND) is directly connected to the ground terminal (Kl.31), to which end the one measuring line (Ushunt2) to the shunt (22) is used jointly as a low-resistance ground supply line (Fig. 2).