Why planetary gear motor has the longer lifetime than worm gear motor and spur gear motor?
Because of the special planetary gearbox, one sun gear and three planetary gears. The gearbox also has gear tooth. Always two or three teeth joggle to other gears. The grease is keeping in gearbox. Except for customized solutions, we produce mainly 3 kinds of micro dc gear motors. These are dc spur gear motors, dc planetary gear motors and dc worm gear motors. And the dc motor can be either brushed dc motor or brushless dc motor.
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