Electrical device

An electrical device comprising a brushless one-phase driving motor which is configured to drive a mechanical unit, the brushless one-phase driving motor comprising:

• a motor rotor which is radially permanently magnetized and which is configured to rotate around a rotational rotor axis;
• a non-symmetric stator back-iron structure comprising a rotor opening for the motor rotor and a lateral bridge portion which is configured to magnetically connect two stator poles;
• a single stator coil which is configured to surround the lateral bridge portion;
• a pole separation gap arranged radially opposite to the lateral bridge portion, the pole separation gap being configured to magnetically separate the two stator poles;
• an electronic control device configured to drive the single stator coil;
• and
• a single hall sensor which is electrically connected to the electronic control device, the single hall sensor being arranged approximately radially opposite to the single stator coil with respect to the rotational rotor axis,
• wherein,
• the single hall sensor is arranged outside of a cross plane which is defined by the motor rotor, and
• the single hall sensor is arranged within an angle of 160° to 200°, as seen from a middle of the single stator coil and with reference to the rotational rotor axis, but is not arranged in an angle of 180° as seen from the middle of the single stator coil and with reference to the rotational rotor axis.