| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotational angle detector using a resolver capable of detecting the rotational angle precisely. SOLUTION: At the time when the resolver 3 is stopping, the variable frequency excitation signal output circuit 13 outputs excitation signal f(t) of continuously varying frequency, the signal selection circuit 14 selects either one of f(t)sinθ, or f(t)cosθ, the variable gain amplifier 16 amplifies the signal selected by the signal selection circuit 14, the adder 17 adds the output signal of the variable gain amplifier 16 and the excitation signal f(t), the minimum value detector circuit 18 detects the time point when the amplitude of the output signal of the adder 17 is minimum, the delay time calculation circuit 19 calculates the delay timeτfrom the frequency F<SB>0</SB>of the excitation signal f(t) at the time point when the amplitude of the output signal is minimum, and the angle correction circuit 20 calculates the correction detection rotation angleϕc based on the delay timτ, when the resolver 3 is rotating. COPYRIGHT: (C)2005,JPO&NCIPI
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