| 摘要 |
PURPOSE:To accelerate the response speed with the high degree of accuracy by measuring the quantity proportionate to a signal period of a position detector by an integrator and filing its final value in the memory of a sample hold circuit with high speed. CONSTITUTION:A low speed detection circuit of a motor 1 is constituted of a position detector 3 of a rotating magnetic pole, a position detector signal composite circuit 4, an integrator 5, a delay circuit 6, a reset circuit 7, a sample hold circuit 8 and a divider 10. And, a signal of the position detector 3 is outputted as a rotary pulse row at the position detector signal composite circuit 4, the integrator 5 is reset and integrated by the reset circuit 7 after a delay time of the delay circuit 6. When the next rotary pulse comes, the output of the integrator is maintained by a hold circuit 9 for the sample hold circuit 8. Accordingly, the divider 10 sends the voltage E0 proportionate to the engine speed of the motor as the output. |
