Control System

  • Drive & Control System
  • Control System
D.C Dynamic Control System
If DC current is applied to the stator winding of the slip ring motor and the motor shaft is rotated by external force, the alternating voltage is induced in the slip ring motor rotor winding.
This alternating voltage causes a current to flow through the resistor connected to the rotor of the slip ring motor.

The braking force is generated by the fixed magnetic field caused by the stator winding and the current flowing through the secondary resistor.

That is, since the energy of the external force is consumed in the secondary resistor, the braking force is generated.
The speed-torque characteristics of the DC dynamic brake vary with the magnitude of the DC excitation voltage and the secondary resistance.





① When lowering, low speed control is possible by Minus load.  
② The lowering speed is controlled easily by adjusting the secondary resistance. 
③ It is difficult to control the speed under light load.   
④ There is no mechanical friction due to electric braking.   
⑤ GD² and installation space is small.     
⑥ It is suitable for heavy duty large craneinstalled in harsh environments such as steel mills.