| 摘要 |
PURPOSE:To prevent malfunction by a method wherein a voltage judging circuit, putting a conduction current control circuit OFF when the output of an absolute value circuit is smaller than a preset given value, is provided between the absolute value circuit and the conduction current control circuit. CONSTITUTION:The output of an absolute value circuit 24 is not inputted directly into a conduction current control circuit 27 but is inputted through a voltage judging circuit 26 and, therefore, the conduction current control circuit 27 is put OFF by the voltage judging circuit 26 when the output of an adding circuit 23 is stagnated at zero potential. Accordingly, current is not conducted through the coil 29 of a linear DC motor 28 and the malfunction of the conduction current control circuit 27 will never be generated by the output of a code judging circuit 25. According to this method, malfunction upon switching the direction of a current, conducted through the coil 29 of the linear motor 28, may be prevented. |
