I would like to ask about the differential of the Flottweg z4e horizontal screw centrifuge; I don’t understand its principle

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The centrifuge is equipped with two motors, each connected to one of the pulleys on the differential. Motor #1 is connected to the larger pulley of the differential, causing the entire differential to rotate; the housing of the differential is connected to the drum, thereby driving it to rotate. Motor #2 is connected to the smaller pulley and functions as the input shaft of the differential. After being slowed down by the gears in the differential, its output shaft is connected to the spiral element of the centrifuge, with the purpose of increasing torque while reducing speed. I have a question: the speeds of the drum and the spiral are not very different, usually around 50 revolutions per minute. If the drum rotates at 3000 revolutions per minute, the spiral rotates at about 3050 revolutions per minute – so the difference isn’t significant. Is it the case that Motor #1 drives both the drum and the input shaft to reach 3000 revolutions per minute, while Motor #2 adds another 50 revolutions per minute to the speed of the spiral through the planetary differential? ? ? ? It doesn’t seem right, but I don’t know the principle behind it. Please, those of you who understand this could give me some guidance. Thank you ;P