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Turbo alternators have rotors of

  • Turbo alternators have rotors of small diameter and long axial length.
  • Turbo alternators are large power-generating machines that are commonly used in power plants and other industrial applications.
  • These machines typically consist of a stationary stator and a rotating rotor, which is driven by a steam turbine or a gas turbine.
  • The rotors of turbo-alternators are designed to operate at high speeds, typically in the range of 3000-3600 rpm.
  • To achieve this high rotational speed, the rotors are made with a small diameter and a long axial length. This design helps to minimize the centrifugal forces on the rotor and reduce the stresses on the shaft and bearings.
  • The small diameter of the rotor also helps to reduce the weight and size of the alternator, making it easier to install and operate.
  • However, the small diameter of the rotor also means that the magnetic field in the machine is relatively weak, which can lead to issues with magnetic saturation and voltage regulation.
  • To overcome these issues, the rotor is often designed with a high number of poles, typically 10-24 poles, which helps to increase the magnetic flux density and improve the performance of the machine.