The three-phase induction motor is one of the most popular and most widely used electric motors. They are used in many applications due to their simple and rugged construction with almost maintenance-free operation. It is an asy…
The working principle of induction motor is similar to transformer i.e., the primary and secondary windings of a transformer are referred to as stator and rotor in case of induction motor. The transformer works on the princ…
During the operation of single-phase ac motors, it experiences various faults at the time of starting or stopping or while running. The faults in single-phase motors are due to many reasons like over or under currents, ove…
Generally, the starting torque of induction motors is reasonably not much high. In case of a slip-ring induction motor, the starting torque can be increased by adding external resistance in the rotor circuit. But, we cannot…
Sometimes the induction motor shows undesirable characteristics known as 'Crawling and Cogging'. These characteristics will affect the motor operation i.e., it reduces the speed of the motor from its full speed rati…
The induction motor and transformer both are singly energized devices. The stator and rotor of an induction motor can be compared to the primary and secondary windings of the transformer. Similarly, from the e.m.f. equation…
In the last article, we have seen the torque equation of induction motor i.e., the amount of torque produced on the rotor depends upon rotor current, rotor resistance, rotor reactance, and slip. From the torque-slip c…
Why induction motor can not run at synchronous speed ? When the supply is given to the induction motor the field winding set-ups a magnetic field rotating at synchronous speed N s ( i.e., N s = 120f / number of poles ),…
We know that the induction motor is an asynchronous motor ( i.e., not a constant speed motor ). Its speed changes with a change in the load connected to it. As the load on the motor increases the slip of the motor increases…
