A substantially longitudinal actuator for winding and unwinding canvases, screens, blinds or roller shutters comprising an epicyclic reduction gear comprising at least two epicyclic gear trains (5, 9), each epicyclic gear train (5, 9) comprising an input shaft (11, 15), an output shaft (13, 17), - the output shaft of the first epicyclic gear train being coupled to the input shaft of the second epicyclic gear train, - the first epicyclic gear train comprising a first planet gear arranged to transmit a motor torque between the input shaft and the output shaft of the first epicyclic gear train, - the second epicyclic gear train comprising a second planet gear arranged to perform a mechanical drive between the input shaft and the output shaft of the second epicyclic gear train, the actuator comprising a tubular motor arranged to transmit a motor torque to the input shaft of the first epicyclic gear train, characterized in that - the first planet gear comprises: - a magnetic drive portion arranged to cooperate with a complementary magnetic part of the first epicyclic gear train by a magnetic interaction effect between at least one magnetic pole (63, 65) of the magnetic drive portion and at least one magnetic pole (63', 65') of the complementary magnetic drive portion, the magnetic drive portion being smooth and purely magnetic, and - a mechanical drive portion arranged to mechanically cooperate with a complementary mechanical drive part of the first epicyclic gear train, - the magnetic drive portion and the mechanical drive portion are rotatably secured about an axis of revolution of the first planet gear, - the epicyclic reduction gear further comprises a brake interposed between the output shaft of the first epicyclic gear train and the input shaft of the second epicyclic gear train, the brake being of the spring brake or cam brake type. - the output shaft of the first epicyclic gear train being coupled to the input shaft of the second epicyclic gear train, - the first epicyclic gear train comprising a first planet gear arranged to transmit a motor torque between the input shaft and the output shaft of the first epicyclic gear train, - the second epicyclic gear train comprising a second planet gear arranged to perform a mechanical drive between the input shaft and the output shaft of the second epicyclic gear train, the actuator comprising a tubular motor arranged to transmit a motor torque to the input shaft of the first epicyclic gear train, characterized in that - the first planet gear comprises: - a magnetic drive portion arranged to cooperate with a complementary magnetic part of the first epicyclic gear train by a magnetic interaction effect between at least one magnetic pole (63, 65) of the magnetic drive portion and at least one magnetic pole (63', 65') of the complementary magnetic drive portion, the magnetic drive portion being smooth and purely magnetic, and - a mechanical drive portion arranged to mechanically cooperate with a complementary mechanical drive part of the first epicyclic gear train, the actuator comprising a tubular motor arranged to transmit a motor torque to the input shaft of the first epicyclic gear train, characterized in that - the first planet gear comprises: - a magnetic drive portion arranged to cooperate with a complementary magnetic part of the first epicyclic gear train by a magnetic interaction effect between at least one magnetic pole (63, 65) of the magnetic drive portion and at least one magnetic pole (63', 65') of the complementary magnetic drive portion, the magnetic drive portion being smooth and purely magnetic, and - a mechanical drive portion arranged to mechanically cooperate with a complementary mechanical drive part of the first epicyclic gear train, - a magnetic drive portion arranged to cooperate with a complementary magnetic part of the first epicyclic gear train by a magnetic interaction effect between at least one magnetic pole (63, 65) of the magnetic drive portion and at least one magnetic pole (63', 65') of the complementary magnetic drive portion, the magnetic drive portion being smooth and purely magnetic, and - a mechanical drive portion arranged to mechanically cooperate with a complementary mechanical drive part of the first epicyclic gear train, - the magnetic drive portion and the mechanical drive portion are rotatably secured about an axis of revolution of the first planet gear, - the epicyclic reduction gear further comprises a brake interposed between the output shaft of the first epicyclic gear train and the input shaft of the second epicyclic gear train, the brake being of the spring brake or cam brake type.