What is synchronous motor and induction motor?

A synchronous motor is a doubly excited machine. An induction motor is a single excited machine. Supply System. Its armature winding is energized from an AC source and its field winding from a DC source. Its stator winding is energized from an AC source.

What is a synchronous motor used for?

Synchronous motors are normally used in applications in which a constant and precise speed is required. Typical applications of these low power motors are positioning machines. They are also used in robot actuators. Synchronous motors are also used in ball mills, watches, record players, and turntables.

What is the difference between an induction motor and asynchronous motor?

Among the classic examples of this phenomenon is that of induction motors and asynchronous motors. All induction motors are asynchronous motors. The asynchronous nature of induction-motor operation comes from the slip between the rotational speed of the stator field and somewhat slower speed of the rotor.

What is the main disadvantage of synchronous motors?

Disadvantages or Demerits:

Synchronous motors requires dc excitation which must be supplied from external sources. Synchronous motors are inherently not self starting motors and needs some arrangement for its starting and synchronizing. The cost per kW output is generally higher than that of induction motors.

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What are the advantages of synchronous motor?

The advantages of the synchronous motor are the ease with which the power factor can be controlled and the constant rotational speed of the machine, irrespective of the applied load. Synchronous motors, however, are generally more expensive and a d.c. supply is a necessary feature of the rotor excitation.

What are the main characteristics of synchronous motors?

Main Features of Synchronous Motors

  • Synchronous motors are inherently not self starting. …
  • The speed of operation of is in synchronism with the supply frequency and hence for constant supply frequency they behave as constant speed motor irrespective of load condition.

Are synchronous motors AC or DC?

In a synchronous motor, AC power is supplied to the stator to generate a rotating magnetic field. DC power is supplied to the rotor which results in discrete North (N) and South (S) poles.

Why is it called synchronous motor?

A Synchronous motor operates at synchronous speed because the field windings on the rotor are directly excited just as the armature windings of the stator are energized. This gives the field windings on the rotor a steady magnetic field that is directly affected by the rotating field in the armature.

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