The power source of industrial robot is generally ac servo motor, because driven by pulse signal, the servo motor itself can achieve speed regulation, why do industrial robots need reducer?Industrial robots usually perform repetitive actions to complete the same process.In order to ensure that industrial robots can reliably complete process tasks in production and ensure process quality, the positioning accuracy and repetitive positioning accuracy of industrial robots are required to be very high.Therefore, to improve and ensure the accuracy of industrial robots requires the use of RV reducer or harmonic reducer.
Another role of precision reducers in industrial robots is to transfer greater torque.When the load is large, it is not cost-effective to simply increase the power of the servo motor, can be in the appropriate speed range through the reducer to improve the output torque.In addition, the servo motor is prone to heat and low-frequency vibration under low-frequency operation, which is not conducive to ensuring accurate and reliable operation of industrial robots that work for a long time and periodically.
The existence of precision reducer makes the servo motor run at an appropriate speed, and accurately reduce the speed to the speed required by various parts of industrial robot, improve the rigidity of the mechanical body while output greater torque.Compared with the general reducer, the robot joint reducer is required to have the characteristics of short transmission chain, small size, large power, light weight and easy to control.There are two kinds of reducers widely used in joint robot: RV reducer and harmonic reducer.
Compared with harmonic reducer, RV reducer has higher rigidity and rotary accuracy.Therefore, in the joint robot, the RV reducer is generally placed in the heavy load positions such as the machine seat, big arm and shoulder.The harmonic reducer is placed on the forearm, wrist or hand;Planetary reducers are commonly used in rectangular coordinate robots.
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