Final answer:
The student's question involves creating a block diagram for torque control in a dyno machine using PI feedback based on motor current measurement, applying principles from electrical engineering and motor mechanics.
Step-by-step explanation:
The student is asking for a block diagram to control the torque of a dyno machine using a PI (Proportional-Integral) feedback control system based on the measured motor current. In electrical engineering, torque control is essential for motor performance and is achieved by adjusting the current through the motor since torque is directly proportional to the current.
To depict this in a block diagram, you would draw the motor with a current sensor connected. The signal from the current sensor would then feed into a PI controller, which adjusts the motor input to maintain the desired torque. It is implied in the question that the motor's torque can be determined by the measured current, acknowledging the principle that when current is passed through loops, the magnetic field exerts torque on the loops, converting electrical energy into mechanical work.
This is related to the understanding of how motors work, as they contain wire loops in a magnetic field. The electrical current in the loops creates a magnetic field which interacts with the external magnetic field, resulting in torque that causes rotation. Reversing the current every half rotation ensures the torque is consistent and drives the motor in the desired direction.