关键词: 旋转变压器, 位置解码, 角度辨识算法, Δ-Σ模数转换

Abstract: Traditional motor resolver position detection requires the dedicated decoder chip. It uses DSP to generate excitation signal, designs the conditioning circuit to modulate the return signal and obtain the cosine signal containing the rotor position, then calculates the rotor position. DSADC peripheral modules contain functions including high frequency excitation generation,signal sampling, modulation, filtering, integration and so on.The resolver decoding can be achieved within the chip.The operating principle of resolver was analyzed and TC275 DSADC was used to generate the excitation signal,modulate and filter the return signal.The rotor position signal was calculated by angle recognition algorithm.The result of decoder chip was used as benchmark to verify the function of designed decoding system.The experimental result proved the correctness and practicability of the decoding system which avoid the use of dedicated decoder chip and cut the cost.