| 摘要 |
PURPOSE:To regulate the number of revolution of a motor in both positive and negative directions with a fundamental frequency being located at the center, by using a 1/N frequency divider, a 1/M frequency divider, frequency-subtracting circuit, and the like. CONSTITUTION:A 1/N frequency divider 9 is inserted between the output terminal of a voltage-regulating-type oscillator 4 and one input terminal of a frequency- subtracting circuit 5, and a 1/M frequency divider 10 is inserted between the other input terminal of the frequency-subtracting circuit 5 and a reference frequency generator 11. The phase of the output of a variable oscillator 1 and the phase of the output of the frequency-subtracting circuit 5 are compared in a phase comparator 2. The output thereof is input to the voltage-regulating-type oscillator 4 by way of a filter 3, and added to a frequency-regulating-type motor 7 by way of a frequency divider 6. |
