Actuator with a brushless two-phase dc motor

Abstract

The present disclosure relates to actuators. The teachings thereof may be embodied in an actuator drive for a flap or for a valve for setting a gaseous or liquid volume flow, for example in the heating, ventilation, and/or air conditioning of a building, for a DC motor with a reduction gear connected downstream and a gearbox-side output. The actuator may include: a motor control unit and a voltage supply unit. The motor may be a brushless two-phase DC motor with a stator comprising a quadruple T armature, each armature comprising an armature coil and a radially outward-lying rotor mounted to rotate relative to the stator. Each armature may have precisely four alternating permanent magnetic poles uniformly distributed. The rotor is connected to a spring applying a restoring force to the rotor if the rotor is deflected from a rest position. The motor control unit includes switches for the DC motor and connects the armature coils to the voltage supply unit as a function of a rotational position of the rotor and the armature coils are interconnected in such a way that, when subjected to current excitation, two adjacent armature coils never form magnetic poles having the same polarity.