What are the advantages of the 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 is difference between synchronous and induction motor?
Synchronous motor runs at the synchronous speed. Induction motor runs at the non-synchronous speed. The synchronous motor works on the principle of the ‘Magnetic Locking’. The induction motor works on the principle of ‘Electromagnetic Induction’.
Which motor is more efficient synchronous or induction?
While synchronous motors have higher efficiency and no slip, induction motors have good starting torque. The synchronous motor has no starting torque. Power factor is lagging in induction motor and unity in synchronous motor. Capex is lower for induction while Opex is lower for synchronous.
What are the benefits of synchronous motor in real world application?
Because of the higher efficiency possible with synchronous motors, they can be used for loads where constant speed is required. Typical applications of a high-speed synchronous motor (above 500 rpm) are fans, blowers, pumps and compressors. 4. Since synchronous motors can be built for speeds as low as 120 RPM.
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.
How can synchronous motor be stopped?
The methods that are employed for Braking of Synchronous Motor are:
- Regenerative braking while operating on a variable frequency supply.
- Rheostatic braking.
What are the applications of induction motor?
These are the most common type of AC motor and are important to industry due to their load capacity, with Single-Phase induction motors being used mainly for smaller loads, for example in household appliances whereas, Three-Phase induction motors are used more in industrial applications including compressors, pumps, …
What is the use of synchronous motor?
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 induction motor and normal motor?
The stator winding of Induction Motor is energized from an AC source. Synchronous Motor always runs at synchronous speed, and the speed of the motor is independent of load, but an induction motor always runs less than the synchronous speed. If the load increased the speed of the induction motor decreases.
Why can’t an induction motor run at synchronous speed?
The rotor is placed in such a way that this magnetic field induces a current in the rotor. This induced current will flow through the rotor winding causing another flux in the rotor. This flux in the rotor will lag stator flux. … So, theoretically, the Induction motor can never run at synchronous speed.
Why it is called induction motor?
This type of engine is also known as an induction motor. The asynchronous motor is based on the currents induced in the rotor from the rotating magnetic field of the stator. That’s why it’s called an induction machine.