There are many ways to reduce motor speed in industrial applications, the most commonly used method is gear assembly (gearbox). Speed reducers or gearboxes reduce motor rotational speed while increasing motor output torque, which means increasing the amount of usable work. The motor power is transmitted through motor shaft to a gear train (assembled by small gears, large gears and a housing) in a speed reducer, and delivered by speed reducer output shaft. Speed reducers or gearboxes are used to reduce motor rotation speed and increase output torque, which is equivalent to improve the working capacity of the motor. In addition, the output direction change is available through a speed reducer. The motor output shaft clockwise rotation can be changed to counterclockwise through a speed reducer, or the output direction is turned 90 degrees by a right angle gearbox to save the installation space.