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The induction motor has self-starting torque whereas the synchronous motor is not self starting. It has to be run up to synchronous speed by any means before it can be synchronized to AC supply. A synchronous motor can be operated with lagging and leading power by changing its excitation.
- What is the major difference between a synchronous motor and an induction motor?
- What is the difference between synchronous motor and asynchronous motor?
- In what way synchronous motor is different from other motors?
- What is synchronous motor?
- Why is it called synchronous motor?
- Where is synchronous motor used?
- What is the difference between synchronous and asynchronous?
- How do you know if a motor is synchronous?
- Whats the difference between synchronous and asynchronous?
- Why are synchronous motors more efficient?
- Why synchronous motor is a constant speed motor?
- Why DC supply is used in synchronous motor?
- How is a synchronous motor started?
What is the major difference between a synchronous motor and an induction motor?
The fundamental difference between these two motors is that the speed of the rotor relative to the speed of the stator is equal for synchronous motors, while the rotor speed in induction motors is less than its synchronous speed.
What is the difference between synchronous motor and asynchronous motor?
Synchronous motor is a machine whose rotor speed and the speed of the stator magnetic field is equal. Asynchronous motor is a machine whose rotor rotates at the speed less than the synchronous speed. ... Synchronous motor requires an additional DC power source to initially rotate the rotor near to the synchronous speed.
In what way synchronous motor is different from other motors?
The power factor of a synchronous motor can be adjusted to lagging, unity or leading by varying the excitation, whereas, an induction motor always runs at lagging power factor. Synchronous motors are generally more efficient than induction motors. Synchronous motors are costlier.
What is synchronous motor?
A synchronous motor is one in which the rotor normally rotates at the same speed as the revolving field in the machine. The stator is similar to that of an induction machine consisting of a cylindrical iron frame with windings, usually three-phase, located in slots around the inner periphery.
Why is it called synchronous motor?
1.2 Synchronous Motors
Synchronous motors, as the name implies, rotate at a constant (synchronous) speed. The rotor of this type of motor is a wound rotor, which receives the excitation (magnetizing) current from its excitation system (a separate direct current source with controller).
Where is synchronous motor used?
In the fractional horsepower range, most synchronous motors are used where precise constant speed is required. These machines are commonly used in analog electric clocks, timers and other devices where correct time is required. In higher power industrial sizes, the synchronous motor provides two important functions.
What is the difference between synchronous and asynchronous?
Synchronous = happens at the same time. Asynchronous = doesn't happen at the same time.
How do you know if a motor is synchronous?
The speed of the rotating stator field is called the synchronous speed. The frequency of the power supply and the number of poles of the machine determine the synchronous speed. A synchronous motor is one in which the rotor turns at the same speed as the rotating magnetic field in the stator.
Whats the difference between synchronous and asynchronous?
Synchronous classes run in real time, with students and instructors attending together from different locations. Asynchronous classes run on a more relaxed schedule, with students accessing class materials during different hours and from different locations.
Why are synchronous motors more efficient?
Synchronous motors generally have a higher power density than induction motors of comparable size, allowing them to provide more power at a smaller volume.
Why synchronous motor is a constant speed motor?
Synchronous motor works on the principle of force developed due to the magnetic attraction established between the rotating magnetic field and the main pole feed. Since the speed of rotating magnetic field is directly proportional to frequency the motor operates at constant speed.
Why DC supply is used in synchronous motor?
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. The poles in the rotor then lock onto (synchronize) and follow the opposing rotating magnetic pole (N follows S).
How is a synchronous motor started?
The motor is first started as a slip ring induction motor. The resistance is gradually cut-off as the motor gains speed. When it achieves near synchronous speed, DC excitation is given to the rotor, and it is pulled into synchronism. Then it starts rotating as a synchronous motor.
