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

Chien-Chang Chen, Yu-Chi Liu
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Abstract

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.
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提高机床光主轴精度测试仪无线充电感应效率的方法
该研究为市场上现有的光主轴精度测试仪Alpha One (α1)提供了一种解决方案。如果使用锂电池作为电源,在测量机床主轴数据的同时对机床主轴进行校准需要很长时间,那么在测量过程中供电系统就会存在断电的风险,从而导致校准误差。因此,本研究开发了无线充电系统作为α1的供电系统,以减少电力系统的停电和更换电池的时间成本。本研究将利用两个降压电路为MSP430G2553、OPA、MOSFET供电,然后利用OPA放大MSP430G2553的PWM,实现MOSFET的Vgs(th)启动电压,并隔离信号以避免噪声。在无线传输线圈和拾取线圈的设计中,线圈模块可以减少磁通密度的泄漏,在3mm的气隙处实现快速充电的效果。仿真结果表明,传输线圈和拾取线圈的充电效率均在85%以上。最后,本研究将设计完整充电系统所需的电路架构,验证实际充电效率与仿真相匹配,并可应用于α1。
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