Research On Wireless Power Supply Technology For Electronic Equipment Installed On Rotating Object

The condition monitoring sensor installed on the rotating object is very important for the industrial equipment.At present,it is usually powered by batteries or traditional methods such as brush and slip ring.This method needs regular maintenance.In special environment,there will generate electric sparks and even happen explosions.Therefore,this paper studies the wireless power transmission technology,and applies this technology to the sensor power supply technology which rotates with the object,so as to solve the problems brought by the traditional power supply mode.Compared with most wireless power transmission technologies,the feature and difficulty of this paper is that the receiving side rotates with other objects.In order to provide wireless power for the electronic equipment installed on the rotating object,this paper presents a rotating inductive coupling wireless power transmission system,taking the blower equipment as an example.It fixes the receiving coil and sensor on the blower blade,rotates with the blade,and installs the transmitting coil on the stationary part of the blower.The main work of this paper is as follows:In order to make the receiving side receive enough power at any position of rotation,this paper studies the inductive coupling mechanism of two transmitting coils and two receiving coils,which is used to ensure that every quarter of the blower rotation cycle can have one receiving coil and one transmitting coil facing each other.Thus,the problem of receiving power instability caused by mutual inductance change between transmitting coil and receiving coil is overcome.The coupling mechanism is simulated by COMSOL multi field coupling software.LCC compensation at the transmitting end is studied to keep the current amplitude of the transmitting coil approximately constant.Therefore,the problem that the current amplitude of the transmitting coil is not stable due to the change of mutual inductance between the transmitting coil and the receiving coil is solved.Through theoretical analysis and simulation,the effectiveness of this compensation is verified.LCC compensation of the emitter is studied to keep the current amplitude of the emitter coil approximately constant.Therefore,the instability of the current amplitude of the transmitting coil caused by the mutual inductance between the transmitting coil and the receiving coil is solved.Through theoretical analysis and simulation,the effectiveness of this compensation is verified.A PWM generator based on SG3525 PWM controller and a full bridge high frequency inverter are designed and manufactured.A wireless voltage sensor based on Wi Fi for signal transmission is made to overcome the difficulty of measuring the voltage in the moving equipment.The experimental platform of wireless power supply for the electronic equipment moving with the object rotation is built based on the blower,which verifies the analysis conclusion that the parallel connection of two receiving coils can improve the load power.When the load is the wind speed sensor,the system can provide 3-5v DC voltage to make the sensor work normally and realize wireless power supply for the wind speed sensor on the blower blade.In addition,a comparison is made between the method of wrapping the transmitting coil on the fan cover.The experimental results show that although the transmission power and transmission efficiency are not as good as the previous method,the transmission power stability of this method is better,and the transmitting coil does not affect the air flow of the blower.