Flat, brushless electric motor for a roof system of an automobile a rotor device, comprising: - a rotor housing element having a first and a second cylinder element, - wherein the rotor housing element comprises an annular disc element which has an inner side and an outer side in the radial direction, - whereby the first cylinder element is arranged on an inner side, - whereby the second cylinder element is arranged on an outer side, - wherein the first cylinder element has a first magnet assembly and the second cylinder element has a second magnet assembly, - wherein the first cylinder element has an inner (3-IM) and an outer shell face (3-AM), - wherein the first magnet assembly is arranged on the outer shell face (3-AM) of the first cylinder element, - wherein a roller bearing can be arranged on the inner side of the first cylinder element on its inner shell face (3-IM), - wherein the cylinder elements (3, 4) are formed to be hollow cylindrical, have different inner and outer diameters, so that a stator device can be arranged between the cylinder elements (3, 4), and are aligned concentrically to one another, - wherein at least one magnet assembly (5, 6) is arranged on each cylinder element (3, 4); and a stator device, comprising: - a stator housing element having a base element and a wall element, which are mutually disposed in such a manner that the stator housing element is configured in the shape of a pot, and - an axle element for externally disposing the roller bearing for the rotor device, wherein the rotor device is connected to the axle element of the stator device via the roller bearing, so that the rotor device and the stator device are rotatable relative to one another. a rotor device, comprising: - a rotor housing element having a first and a second cylinder element, - wherein the rotor housing element comprises an annular disc element which has an inner side and an outer side in the radial direction, - whereby the first cylinder element is arranged on an inner side, - whereby the second cylinder element is arranged on an outer side, - wherein the first cylinder element has a first magnet assembly and the second cylinder element has a second magnet assembly, - wherein the first cylinder element has an inner (3-IM) and an outer shell face (3-AM), - wherein the first magnet assembly is arranged on the outer shell face (3-AM) of the first cylinder element, - wherein a roller bearing can be arranged on the inner side of the first cylinder element on its inner shell face (3-IM), - wherein the cylinder elements (3, 4) are formed to be hollow cylindrical, have different inner and outer diameters, so that a stator device can be arranged between the cylinder elements (3, 4), and are aligned concentrically to one another, - wherein at least one magnet assembly (5, 6) is arranged on each cylinder element (3, 4); and - a rotor housing element having a first and a second cylinder element, - wherein the rotor housing element comprises an annular disc element which has an inner side and an outer side in the radial direction, - whereby the first cylinder element is arranged on an inner side, - whereby the second cylinder element is arranged on an outer side, - wherein the first cylinder element has a first magnet assembly and the second cylinder element has a second magnet assembly, - wherein the first cylinder element has an inner (3-IM) and an outer shell face (3-AM), - wherein the first magnet assembly is arranged on the outer shell face (3-AM) of the first cylinder element, - wherein a roller bearing can be arranged on the inner side of the first cylinder element on its inner shell face (3-IM), - wherein the cylinder elements (3, 4) are formed to be hollow cylindrical, have different inner and outer diameters, so that a stator device can be arranged between the cylinder elements (3, 4), and are aligned concentrically to one another, - wherein at least one magnet assembly (5, 6) is arranged on each cylinder element (3, 4); and a stator device, comprising: - a stator housing element having a base element and a wall element, which are mutually disposed in such a manner that the stator housing element is configured in the shape of a pot, and - an axle element for externally disposing the roller bearing for the rotor device, - a stator housing element having a base element and a wall element, which are mutually disposed in such a manner that the stator housing element is configured in the shape of a pot, and - an axle element for externally disposing the roller bearing for the rotor device, wherein the rotor device is connected to the axle element of the stator device via the roller bearing, so that the rotor device and the stator device are rotatable relative to one another.