| 摘要 |
PURPOSE:To prevent runaway of motor through a simple constitution. CONSTITUTION:Speed detection outputs are introduced from F/V converters 2, 2A to a high signal priority detector 7 where one having higher absolute value is selected. It is then imparted with a polarity corresponding to an output from a rotational direction detector 3A fixed to motor 9 side. According to the constitution, detection of rotational direction is not required on the side of a pulse generator 1 and the F/V converter 2 and thereby the constitution is simplified, resulting in prevention of runaway of motor due to directional unmatch of the line and the motor. |
