ACTUATOR DRIVE HAVING A BRUSHLESS TWO-PHASE DC MOTOR AND USE OF SUCH A DC MOTOR

摘要

The invention relates to an actuator drive (1) for a flap (2) or for a valve for setting a gaseous or liquid volume flow. The actuator drive has a DC motor (3), a reduction gear (4) connected downstream and a gearbox-side output (5) for the flap or for the valve. Said actuator drive (1) also has a motor control unit (10) for actuating the DC motor and a voltage supply unit (20), wherein according to the invention the DC motor is a brushless two-phase DC motor. The latter has a stator (6) which is embodied as a quadruple T armature with, in each case, an armature coil (C1 - C4) and a rotor (7) which is mounted so as to be rotatable relative to the stator and has four permanent magnetic poles (N, S) which alternate in the circumferential direction. The rotor (7) of the DC motor (3) is connected to a spring device which, if the rotor (7) is deflected from a position of rest, applies a driving-back force to said rotor (7). The motor control unit has electrically actuable switching means (S1, S2; Z1-Z4) as an actuating device for the DC motor for providing a torque with a predefinable rotational direction. The motor control unit is configured to connect the armature coils to the voltage supply unit using the switching means in accordance with the predefined rotational direction and as a function of a rotational position of the rotor. The armature coils are connected to one another in such a way that, when current excitation occurs, two adjacent armature coils never form magnetic poles with the same polarity.