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Project No 25: Induction motor driving a long conveyor belt through a fear box Consider a conveyor belt with a length of two kilometres transporting coal from a mine to a power station. See the notes on the V-drive for this course, various mechanical loads and their torque-speed curves, this can assist you. Task for mechanical engineering students: Assume a certain weight of the material per unit length; choose a width for the conveyor belt. Choose a linear speed for the conveyor belt, a gear box to drive the conveyor belt. Calculate a ratio for the gear box such that the electric motor driving the gear box will rotate at an acceptable standard motor speed. Assume an efficiency number for the conveyor system. Calculate the torque-speed relationship for the conveyor system. How much starting torque is required? Calculate max power requirements and at what speed value? Forward this information to electrical engineering students. Produce drawings where you can. The electric motor may have to drive the conveyor through a fluid clutch, investigate this possibility, what is a fluid clutch, how does it work, how to specify etc. Task for electrical engineering students: The main problem is to size the electric motor. What torque and speed is required? What is the maximum motor torque require and how much? Which type of motor are you going to choose with a motivation? If the conveyor is fully loaded at standstill a high torque will be required to start the system. This will draw a large current from the electrical power system. How are you going to limit the current drawn from the electrical power system? Explain. Produce drawings where you can. Assume some parameters for your driving induction motor. Calculate the starting current from the equivalent circuit for the motor.