Control unit for rotating speed

Abstract

Abstract PURPOSE: To safely perform the switching of number of revolutions, by switching the number of revolutions through the change of delay time in the delay circuit and switching the slope of the slope part of the trapezoid wave signal and the frequency characteristics of the integrating circuit through interlocking with the switching. CONSTITUTION: The output of the frequency generator 8 detecting the rotating speed of VTR, etc. is fed to the servo IC having two functions of speed and phase controls, and the delay time of the externally mounted circuit 29 of the speed reference MM13 is changed with the switching signal generating circuit 33, allowing to selectively change the number of revolutions of the motor 7. Further, in interlocking with this, the slope of the slope part of the trapezoid signal is switched with the externally mounted circuits 30, 31 of the trapezoid circuits 14, 20 and the frequency characteristics of the integration circuit 54 is switched by giving the speed error output to the circuit 54. Accordingly, in interlocking with the speed switching ratio, the speed slope sensitivity and the frequency characteristics are switched, allowing to perform stable control even at the time of speed change of several times or more. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Masaru Hashirano
• 👤 Yasuo Nishitani

Bibliographic Details