Method to Enhance the Induction Efficiency of Wireless Charging for Machine Tools Optic Spindle Precision Tester

The study provides a solution for the optic spindle precision tester Alpha One (α1) available on the market. If the lithium battery is used as the power source and it takes a long time to measure the data from the spindle of the machine tool and calibrate the spindle of the machine tool at the same time, the power supply system becomes having a risk of power failure during measurement and cause calibration errors. Therefore, the study developed the wireless charging system as the power supply system of α1 to reduce the power failure of the power system and the time cost of replacing the battery. The study is going to use two buck circuits supply power to MSP430G2553, OPA, MOSFET, then use OPA amplify the PWM of MSP430G2553 to accomplish MOSFET Vgs(th) starting voltage also isolate signal to avoid noise. In the design of wireless transmission coil and pick-up coil, the coil module can reduce leakage of magnetic flux density and achieve a fast charging effect at an air gap of 3 mm. The simulation of the transmission coil and Pick-up coil have a charging efficiency of over 85 %. Finally, the study will design the required circuit architecture for complete the charging system, verify that the actual charging efficiency matches the simulation, and can be applied to α1.