| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a rotation angle detecting device dispensing with a dedicated circuit such as a multiplying DAC, a SIN-ROM table, and COS-ROM table. <P>SOLUTION: A rotation angle detecting device comprises: an A/D converter 3A for performing the A/D conversion on a rotation detection signal sinθ*f(t); an A/D converter 3B for performing the A/D conversion on a rotation detection signal cosθ*f(t); Fourier analysis means 4A for extracting an amplitude intensity sinθof the fundamental wave component from the rotation detection signal sinθ*f(t) converted by the A/D converter 3A; Fourier analysis means 4B for extracting an amplitude intensity cosθof the fundamental wave component from the rotation detection signal cosθ*f(t) converted by the A/D converter 3B; a composite wave generator/phase controller 5 for generating a composite wave sin(θ-ϕ) from the amplitude intensities sinθand cosθ, and an internally estimated angleϕ, and for controlling the internally estimated angleϕto be identical with a rotation angleθon the basis of a polarity of the composite wave sin(θ-ϕ); and an excitation signal generator 7 for generating a sine wave or a binary excitation signal for the rotation angle detecting device. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
