Patent ID: 8525457

Claim:
An EC motor assembly ( 1 ), comprising an electronically commutated, permanent magnet-excited DC motor (M) with an upstream commutation electronic unit ( 2 ) that is supplied with a DC link voltage (U ZK ) via a DC link ( 8 ), wherein the DC link ( 8 ) can be connected directly to a solar cell generator ( 12 ) via a first voltage input ( 10 ) and via a controllable power supply ( 14 ) and a second voltage input ( 16 ) to a grid voltage (U M ), the DC link voltage (U ZK ) being variably based on a respective photovoltaic voltage (U PV ) available from the solar cell generator ( 12 ), and the output voltage of the power supply ( 14 ) being regulated via an MPP regulator ( 18 ) to draw as much power as possible from the solar cell generator ( 12 ) by specifying a motor operating point (AP) with a rotational speed target value (n soll ) and during variations of photovoltaic parameters, being adapted via the commutation electronic unit ( 2 ) in such a manner that the motor rotational speed is maintained near the target value (n soll ).