设计了一种基于单片DSP的旋变轴角解码与激磁系统并进行了实验验证。由于轴角解码中反正切运算需要很大运算量或很多数据空间存储查表值,甚至需要外扩存储芯片,因此,提出一种反正切运算补偿成分区间的线性运算求角方法。同时,在保证测角精度的基础上降低旋变激磁的电压幅值,从而实现了旋变轴角解码与激磁系统的高集成度与低功耗。实验结果显示:测角精度可达0.013°,框架电机速率精度达到0.000 4°/s。体积、质量、功耗与原激磁电源模块JD20-D15C36MK和轴角解码模块19XSZ2413相比均减少80%以上,很好地满足了航天应用小体积、轻质量和低功耗的要求。

A resolver excitation and reolver-to-digital conversion system based on a single DSP is designed and some experiments are carried out to examine its validity.A linear angle calculation method with little operation or a few memories is proposed,for the inverse tangent operation of the resolver-to-digital conversion in an original system needs complex computations and a large memoried space,even an additive memory chip. Then,the voltage amplitude of the resolver excitation is reduced based on enough angle precision to obtain an excellent integrated system combinng the resolver excitation and reolver-to-digital conversion system and to provide the low power consumption of the system.The experimental results can offer the angle precision of 0.013°,and the CMG gimbal motor velocity precision of 0.000 4°/s.The bulks,weights and power consumption of this system have reduced by more than 80% compared with those of the resolver excitation module JD20-D15C36MK and resolver-to-digital conversion module 19XSZ2413,which meets the space application demands of small size and low power consumption.