12 December 2023

Advantages and Disadvantages of Synchronous Motor

Synchronous motors are rarely used in industries for drive applications and are generally used as power factor correction devices. Some advantages and disadvantages of synchronous motors are explained below.  

Advantages of synchronous motor

  • It operates at a constant speed.
  • Compared to induction motors, synchronous motors are less costly.
  • Under specific kW and speed ranges, it is less costly.
  • It is usually run at higher efficiencies.
  • It is possible to operate the load by using a single synchronous motor.
  • It also corrects the power factor of the plant.
  • Electromagnetic power in synchronous motors varies linearly with the voltage.
  • It is mechanically stronger than induction motors.

Disadvantages of synchronous Motor

  • Synchronous motors are costlier than induction motors.
  • The construction of a synchronous motor is more complicated than an induction motor.
  • Synchronous motors are inherently not a self-starting motor
  • Synchronous motors require DC excitation.
  • Synchronous motors need some arrangement for their starting and synchronizing.
  • The synchronous motor requires setup to start and synchronize.
  • The synchronous motor stops when the load exceeds its capacity.
  • Synchronous motors cannot be useful for applications requiring frequent high-starting torques required.
  • In general, the cost per kW output is generally higher than that of an induction motor.
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