Transformer-Based Cascaded Speed Control: Achieving Precise Motor Speed Ratios Through Transformer Turn Optimization for Multi-Motor Systems

The study mainly analyses the relationship between precision control and speed of cascaded transformers connected to DC motors in a simulated power plant prototype. The prototype system was designed to observe specific rotational speed ratios between 3 DC motors where the second motor is operating at 50% of the first motor's speed, and the third motor operating at 30% of the second motor's speed. Controlling turn ratios of the transformer while maintaining uniform primary voltage across all transformers, the system was capable of executing with precise speed control with 0.57% error for the second motor and 4.125% error for the third motor, leading towards a high accuracy-based system prototype. By incorporating full-wave bridge rectifiers for current conversion from AC to DC and additional filtering components, the prototype ensured stable operational execution. Focusing on the advantages of the transformer-based approach for industrial applications requiring precise motor speed control, voltage-speed relationship-based graphs were plotted. This research provides valuable insights for power plant designers seeking efficient methods to implement cascaded speed control systems while maintaining power quality and operational stability.