Research On Key Technologies Of Non-contact Power Transfer For Rotating Devices In High-temperature Environment

In the field of automation, automotive, medical devices, etc, we often need to transmit electric power between rotating structures. Today the widely used rotating structure power transmission device is slip rings, which using the elastic pressure to push the brush into the slip ring groove in order to pass current. But in areas such as aerospace, oil exploration, power generation and other high-temperature environments, because of the electrical contact, it’s easy to produce sparks, which results a lower security and reliability. Under conditions of high rotational speed slip,friction and heat problem seriously affect the life. In addition, the slip ring is sensitive to dust, dirt, water and other environmental factors, which have the impact on the power transmission capacity.In response to these problems, we propose and implement a new non-contact power transmission coupling device based on loosely coupled transfer and power converter to replace the slip ring. According to the characteristics of loosely coupled transformer, through simulation and analysis on coefficient factors, we give the design method of loosely coupled transformer for high temperature application. A method using long strip cores spliced into a ring core is proposed and implemented to solve the difficulty and costly problem in the production of integrated core. An efficient inverter circuit and power conditioning circuit is improved and achieved, with high efficiency, high temperature, small advantages, achieving a power of transmitter and receiver.According to the new methods and the design, a non-contact power transmission device with high temperature endurance is manufactured and parameters such as transmission power, transmission efficiency, temperature are experimented. Test results show that the overall power transmission system power≥300W,transmission efficiency^75%,temperature stability up to+125℃,meeting the high temperature non-contact power transmission application requirements.