Gear Motors
(1) External type: This motor is simple, compact, lightweight, inexpensive, and capable of relatively high-speed rotation. It has a cross-sectional structure similar to that of gear pumps. It requires a drain to be installed for oil seal protection.
(2) Internal type: This motor is compact and relatively inexpensive, and operates with a high torque at a low speed. It consists of an internal trochoid gear motor and a differential speed reducer. Fig. 10.4 shows the cross section of this motor.
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