Why speed of im motor decrease with increase in load?
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An induction motor is a subsynchronous motor . It always run at less than synchronous speed. The speed of the motor is directly proportional to the EMF induces across the rotor terminal. This EMF causes flow of current in the rotor bars which causes torque over the rotor shaft . The speed of the rotor shaft is dependent over the load torque..The EMF induced across the rotor bar decreases as the load increases and vice versa…
There are two kinds of torque in an induction motor..
Electromagnetic torqueLoad torque..
In any situation an equilibrium state takes place between the load torque and electromagnetic torque..
As the load torque increases the electromagnetic torque decreases and vice versa..
The load torque is dependent on the load connected to the shaft . As the load increases then the electromagnetic torque(responsible for the shaft rotational speed)decreases as well as speed decreases
This can be derived by the formula
P= (Omega)*(torque)…
Power is always same for constant power operation.. ..
So if the load torque increases the speed decreases and vice versa…
In this way speed of the motor decreases with the increasing of load in rotor shaft…
There are two kinds of torque in an induction motor..
Electromagnetic torqueLoad torque..
In any situation an equilibrium state takes place between the load torque and electromagnetic torque..
As the load torque increases the electromagnetic torque decreases and vice versa..
The load torque is dependent on the load connected to the shaft . As the load increases then the electromagnetic torque(responsible for the shaft rotational speed)decreases as well as speed decreases
This can be derived by the formula
P= (Omega)*(torque)…
Power is always same for constant power operation.. ..
So if the load torque increases the speed decreases and vice versa…
In this way speed of the motor decreases with the increasing of load in rotor shaft…
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