Impact of Torque Ripple on Material Surface Measurement in Additive Manufacturing
摘要
One of the key factors in the operation of electric motors is the generation of electromagnetic torque, which is then transmitted to the shaft. Electromagnetic torque causes the rotational motion of the actuators but can also create other forms of vibration due to mechanical, electrical, and magnetic effects. The electromagnetic torque generated in the electric motor contributes directly to the torque on the shaft. Nevertheless, losses occur between the two. The torque on the shaft is reduced due to mechanical, electrical, and dynamic losses that affect the efficiency of force transfer from the electromagnetic torque to the shaft. In an optimum system without losses, the torque on the shaft would correspond to the electromagnetic torque. In practical implementations, however, losses inevitably affect the resulting performance at the shaft. The primary objective is to measure the current torque at different speeds to obtain data and current torque waveforms. The proposed methodology works with a linear axis while the main actuator is taken care of by a servo drive which is connected to the runner by a ball screw. The control of the servo motor is taken care of by a PLC device with a control panel and a touch screen HMI. Since it is based on the knowledge that the transmitted vibrations caused by the electric motor by its rotation and torque can be transmitted to the measured element and thus can cause inaccurate or erroneous surface measurements.