| 摘要 |
<p>PURPOSE:To easily perform trouble monitor and to enhance reliability, by detecting abnormality from the input and output of a synchronous rectifier circuit for synchronously rectifying the AC positional deviation signal of a position signal to be detected and a position detection signal to a DC positional deviation signal. CONSTITUTION:AC voltages e1, e2, e3 outputted from synchronous electrical equipment 1 are converted to resolver signals e4, e5 by a Scott transformer 3 while these signals e4, e5 are multiplied by the cosine and sine of the position detection signal phi of a counter 10 by a cosine multiplier circuit 5 and a sine multipler circuit 6 through a quadrant selection circuit 4. The outputs of the multiplier circuits 5, 6 are added by an adder circuit 7 to issue an AC deviation signal DELTAE which in turn receives synchronous rectification by a synchronous rectifier circuit. A counter 10 is driven through a V/F converter 9 to output said deviation signal as a position detection signal phi. Input and output signals DELTAE, ep of the synchronous rectifier circuit 8 are applied to an abnormality detection circuit 13 and outputs an abnormality detection signal S at the time of abnormal operation.</p> |
