Flexible coupling is used between encoder and motor. Sometimes, it is called encoder coupling or motor coupling. Encoder coupling is a mechanical part used to couple two shafts (driving shaft and driven shaft) in different mechanisms to rotate together in order to transmit torque are used to transmit torque from one shaft to another when the two shafts are slightly misaligned. Motor coupling can adapt to different degrees of misalignment up to 3°. The high speed encoder coupling and low speed large torque motor coupling are widely applied to universal mechanical devices, like paper making machinery, ventilating device.