Motor Torque & Bearing Drag Calibration

Overview

Developed and implemented an automated PLC calibration procedure to improve the accuracy of bearing drag torque measurements used during linear actuator assembly. The system compensates for variations in motor characteristics by calibrating the relationship between motor current and output torque before production testing. This calibration significantly reduced measurement error, resulting in more reliable bearing torque data and improved manufacturing consistency. The calibration routine was programmed in Siemens TIA Portal and integrated directly into the machine's HMI workflow, allowing operators to perform calibration with minimal manual intervention. The program records reference points, performs linear interpolation between calibration values, and automatically applies compensation factors during production torque testing.

Key Deliverables

• Implemented a calibration method which improved motor torque readings.
• Lead to a more accurate bearing torque readings to manufacture linear actuators in YAMAHA's products.
• Programed a linear interpolation between 2 points for bearing resistance and torque motor current draw.