Which of the following load normally need starting torque more than the rated torque?

Which of the following load normally need starting torque more than the rated torque?

Right Answer is:

Conveyors

SOLUTION

  • Starting torque is also called the locked-rotor torque and the motor current at this point is referred to as the ‘locked rotor current. At this stage, the rotor reactance is higher than its resistance, as the rotor frequency is at its highest (equals the supply frequency).
  • Starting torque is the amount of torque required to overcome the inertia of a standstill motor.
  • Conveyors require high starting torque because the material is placed before the starting of the Conveyors belt.
  • So obviously we require more torque to overcome the load at the starting period.
  • Therefore conveyor required high starting torque and constant speed.
  • Series motor is suitable for conveyor belts operating in a particular region of its torque-speed characteristics.
  • In industries  BLDC is used, as BLDC provides PWM speed controlling method which is easier to vary the speed as well as with low maintains.
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