| 摘要 |
According to the invention, a DC-motor (46) actuates a highly reduced reduction gear of an actuating drive for a flap or for a valve in order to regulate a gas or liquid volume flow, in particular in the field of heating/ventilation/climatisation, or fire or room protection. The electric flow of current in the stator coils (A, B, C) is commutated in a program-controlled manner without integrated position sensors. The rotations of the rotor (54) of the DC-motor (46) can be counted by means of special algorithms. Problems related to the principle of motor rotation speed of less than approximately 200 rpm are prevented. The DC-motor (46) comprises a stator (44) which comprises three stator coils (A, B, C) which extend over 3n stator poles (52), and an annular-shaped permanent magnet rotor (54) having 2m permanent magnet segments with alternating polarity (N, S), a coaxial cup-shaped external rotor (110) and a coaxial drive shaft (108), whereby n and m are whole multiplication factor numbers (1, 2, 3, 4) and are different from each other. The drive shaft (112) comprises, preferably, a spring (120) for the automatic return in case of an interruption in current.
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