| 摘要 |
PURPOSE:To stop a low-speed rotary body at an unbalance point by detecting and filtering the unbalance signal of the low-speed rotary body by an acceleration detector on every turn and extracting a sine wave, generating a pulsating rotation signal, and counting an angle signal according to the rotation signal and stopping the rotary body when the counted value reaches a set value. CONSTITUTION:The signal indicating the unbalance of the low-speed rotary body 1 of about 100-200r.p.m is generated by the acceleration detector 12 and variable amplification 13 is performed on every turn; and a superposed unnecessary signal is filtered 14 and 15 to pass only a basic frequency signal, which is converted 16 into the sine wave, which is integrated 17 to extract only a positive signal. The pulsating rotation signal corresponding to the phase of the unbalance point of the rotary body is obtained from said signal. The angle signal generated by an angle signal generator 11 is counted after the start of speed reduction according to the rotation signal and a stop signal is sent to a control circuit 9 when the counted value reaches the set value 22 to stop the rotary body, which then stops at the unbalance point automatically.
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