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The role of high precision harmonic reducer in industrial robots

update:04-05-2020
abstract:

The power source of an industrial robot is generally an […]

The power source of an industrial robot is generally an AC servo motor. Because it is driven by a pulse signal, the servo motor itself can achieve speed regulation. Why do industrial robots also need high-precision harmonic reducer reducers? Industrial robots usually perform repeated actions. In order to complete the same process in order to ensure that the industrial robot can reliably complete the process tasks in production and ensure the quality of the process, the positioning accuracy and repeat positioning accuracy of the industrial robot are very high. Therefore, to improve and ensure the accuracy of industrial robots, high-precision harmonic reducers or RV reducers are required. Another role of high-precision harmonic reducers in industrial robots is to deliver greater torque. When the load is large, it is not cost-effective to increase the power of the servo motor. The output torque can be increased by the reducer in a suitable speed range. In addition, servo motors are prone to heat and low-frequency vibrations at low frequencies, which is not conducive to ensuring accurate and reliable operation for long-term and periodic industrial robots.
The presence of a high-precision harmonic reducer allows the servo motor to operate at a suitable speed and accurately reduce the speed to the speed required by various parts of the industrial robot to increase the rigidity of the machine while outputting greater torque. Compared with universal reducers, robotic joint reducers require short drive chains, small size, high power, light weight and easy control. There are two main types of reducers that are widely used on articulated robots: high-precision harmonic reducers and RV reducers. Compared to high-precision harmonic reducers, RV reducers have higher stiffness and rotational accuracy. Therefore, in the articulated robot, the RV reducer is generally placed at the heavy load position such as the boom and shoulder of the base; the high-precision harmonic reducer is placed on the arm, wrist or hand; the planetary reducer is generally Used on Cartesian robots.

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