Please see the circuit below. I have a 2 phase AC motor 120v, 50hz, 250w, I need to use this to enforce a constant velocity against an accelerating force, or in other words the motor rotates clockwise, the force applied makes it want to accelerate clockwise. When the force of the load is applied it accelerates the motor. I need the motor to maintain a constant force despite the load. I had this occur before on a DC motor, and the install of a parallel resistor and diode gave the motor the umph it needed to resist the accelerative load. Please help me know how to insert resistors, or the like to this circuit to let this motor operate as i need.

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  • \$\begingroup\$ Also to add to the question, would you add a resistor to one of the phases or both, if both, would the resistors have to be identical? \$\endgroup\$ – Jordan Carr Sep 24 at 21:10
  • \$\begingroup\$ Do you want constant speed or constant force? You can't have both. \$\endgroup\$ – Kevin White Sep 24 at 21:49
  • \$\begingroup\$ This is something you would probably use a VFD for, and set it for constant torque and appropriate acceleration/deceleration curves. \$\endgroup\$ – Ron Beyer Sep 24 at 23:25
  • \$\begingroup\$ it's probably best to start with a synchronous motor instead of an induction motor. \$\endgroup\$ – Jasen Sep 25 at 6:34
  • \$\begingroup\$ I need constant speed under variable force situations. \$\endgroup\$ – Jordan Carr Sep 26 at 14:35

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