Скачать или смотреть how to work synchronous motor | Working of Synchronous Motor | induction motor | synchronous speed |

how to work synchronous motor | Working of Synchronous Motor | induction motor | synchronous speed |
why Induction Motor can not run at synchronous speed?
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An induction motor, also known as an asynchronous motor, cannot run at synchronous speed due to its fundamental operating principles. Here's a detailed explanation:

Basic Principle
Synchronous Speed is the speed at which the magnetic field rotates, determined by the frequency of the AC supply and the number of poles in the motor. It is calculated as:

Rotor Induction:
The rotating magnetic field induces a current in the rotor conductors (via electromagnetic induction), creating another magnetic field that interacts with the stator’s field.

Torque Production:
The interaction between the stator’s rotating magnetic field and the rotor’s magnetic field generates a torque, causing the rotor to turn.

Why Induction Motor Cannot Run at Synchronous Speed
Relative Motion Required: For induction to occur, there must be relative motion between the rotating magnetic field of the stator and the rotor. This relative motion is called slip.

Slip is defined as the difference between synchronous speed and rotor speed (The rotor needs to lag behind the synchronous speed to maintain this slip.

No Induction at Synchronous Speed: If the rotor were to reach synchronous speed , the relative motion would be zero. This means no current would be induced in the rotor, and hence no torque would be generated. Without torque, the rotor cannot sustain motion and would slow down, increasing the slip again.

Equilibrium of Slip: The rotor speed stabilizes at a point slightly less than synchronous speed. At this point, the slip is small but sufficient to induce the necessary current in the rotor to produce the required torque.
how to work synchronous motor | Working of Synchronous Motor | induction motor | synchronous speed |
Key Points
Torque Proportional to Slip: The torque developed in an induction motor is proportional to the slip between the rotating magnetic field and the rotor speed.
Load Dependence: The amount of slip also depends on the load on the motor. Under light loads, the slip is small, and the rotor speed is close to synchronous speed. Under heavier loads, the slip increases to provide more torque.
Summary
The inability of an induction motor to run at synchronous speed is due to the need for slip to induce rotor currents and generate torque. If the rotor reached synchronous speed, there would be no relative motion between the magnetic fields, no induced currents, and no torque, leading the rotor to decelerate back to a lower speed where slip can exist and torque can be developed again.
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Construction:
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