The invention relates to a motor-driven machine tool unit (2), such as a multi-axis rotational head, a motor spindle (2), a rotary table, or the like, having a stator unit (16) and at least one rotor unit (15) having a rotor shaft (8) that is rotatable about an axis of rotation. The rotor unit (15) comprises at least one first bearing unit arranged in the end region of a tool and/or workpiece receptacle, and a second bearing unit (19) arranged at the opposite end region (18) for mounting the rotor shaft (8) in the stator unit (16). At least one electrical power transmission unit for transmitting electrical power between the stator unit (16) and the rotor unit (15) is provided. The problem addressed by the invention is that of better satisfying the increasing demands on modern machine tools or machine tool units. This problem is solved, according to the invention, in that the electrical power transmission unit (10) is arranged in the end region (18) opposite the tool and/or workpiece holder and/or on the second bearing unit (19).