SHENZHEN DONGMING MOTOR CO., LTD.
In a planetary gearbox, the gears integrated with each other just like the planet in the universal, the gears bit each other tightly in order. This is why the dc planetary gear motor with such high efficiency. Certainly the price for planetary would be twice or more than spur.
On the other hand, if related projects have strict requirements about cycle or working life, for example electronic lock has special request about cycle test, so planetary gearbox with carbon brush motor would be first recommendation.
According to the size of gearbox, the normally dc planetary gear motor including 16mm, 22mm, 28mm, 36mm and 42mm dc planetary gear motor.
DC planetary gear motor are mostly applied on robots and some products with high torque.