I have a system where the torque is constantly changing, but I need the speed to remain at 9RPM. I have enough room for error where I can be between 8 and 10RPM. How can I achieve this? All I can find info on is SCR's, but that doesn't have a feedback controller so I don't understand how it would hold the speed at 9RPM as the torque varies.

  • $\begingroup$ SCRs on their own would not. SCRs are but one component of motor drivers for some types of motors and motors DC motors are not among them. Looking for things like SCRs when you need a motor driver is like looking at tires when you need a car. Look for motor drivers with speed control and feedback. $\endgroup$
    – DKNguyen
    Mar 14 at 21:44
  • 1
    $\begingroup$ please provide a link to the motor datasheet $\endgroup$
    – jsotola
    Mar 14 at 22:03
  • $\begingroup$ Yep, you need either built-in or external feedback to control the power feed to your motor. $\endgroup$ Mar 15 at 14:29
  • $\begingroup$ grainger.com/product/DAYTON-DC-Gearmotor-90V-DC-6Z912 This is the motor I am using. I have also found a separate driver, would something like this work at regulating my speed? grainger.com/product/DART-CONTROLS-DC-Speed-Control-SCR-6Z386 $\endgroup$ Mar 15 at 22:45
  • $\begingroup$ @DKNguyen what would you look for if you are searching for a DC motor driver with feedback control then? Everything I find for motor speed control is literally just a SCR or PWM "controller" which just lets you set the speed, but doesn't look like it is closed-loop. I could definitely be wrong but just wondering. $\endgroup$ Mar 15 at 22:51


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