Electronically commutated motor

Electronically commutated motor having: a rotor (108); a stator with a winding arrangement (102) of the stator; full bridge circuit (137) for controlling the current (i1, i2) in the winding arrangement (102) of the stator; being in the full bridge circuit (137) connected to a first power line current (116), a first semiconductor switch (114, 130) and the other line of DC power (122), a second semiconductor switch (132, 136) which in connected state are bidirectional current conductors; an arrangement (172, 198, 188) for opening the first semiconductor switch (114, 130) and for closing the second semiconductor switch (132, 136) for a predetermined operating state; and an arrangement (202) for monitoring the direction of the current (i1, i2) flowing in the second semiconductor switches (132, 136) when they are conductive during the predetermined operation state.