The Solution For Obtaining Resolver Angular Position And Speed

This thesis particularly described the solution for obtaining Resolver angular position and speed.With discussing the significance of AC servo and the importance of sensors'role in AC servo,this paper educed a position and speed sensor-Resolver,which now used widely.On the basic of particular analyzing the Resolver's principle,we summed up many advantages of Resolver and pointed out the main disadvantage of the Resolver's application-the complexity of decoding analog signal.Many corporations produced some special Resolver-to-Digital converters to overcome the Resolver's disadvantage.The method of using AD2S80A chip to realize the decoding analog signal had been presented in this paper.After outlining many diadvatages of AD2S80A,we analyzed the principle of AD2S80A and the method of AD2S80A's external circuit design.After these analyses,the hardware and software of the AD2S80A decoding syetem had been designed.Because the special Resolver-to-Digital converter generally is very expensive,we designed a new decode method using DSP chip to reduce cost. this paper adopt oversampling technique to improve the resolution.The oversampling technique's theory and implementation steps had been particularly presented.The realization of FIR digital filter and arctg function were the key points of this method.By the use of MATLAB, we designed and proved the FIR digital filter.on the other hand,we propose a fast and high precision calculation of arctg function,then expounded the theory and the realization steps.After these presentations,lastly this paper designed the hardware and software of the DSP decoding system.