3 phase induction motor: Is it super beneficial or a boom, the decision is completely yours!

One of the most popular and commonly used AC motor 3phase induction motor. It is highly used in big industries and several other factories. The main reason why this motor is used it is cheap price, reliability and efficiency. It also has high torque and good speed regulation. It requires less or very little maintenance and overload capacity is also reasonable. In fact, the popularity of a 3 phase induction motor is really demanding on board ships. The reason being its characteristics and unique features which include robust construction, high-end functioning and simplicity. So, all these things make it perfect fit for sea environment. Along with this, an induction motor is something that can be used for variety of purposes with different load requirements and speed. 

Induction motors are used in almost every machinery system of ship like propulsion motor, blower motor, small synchronous motor, water pump motor and crane Motor.

Understanding 3 phase induction motor

A 3 phase induction motor have 3 phase AC supply and is mostly seen in ships for docking and undocking heavy loads. Two main types of three phase motor resistor slip ring motors and squirrel cage motors. Because of the simple design and rugged construction, squirrel cage motors are used widely. Two main elements of a three phase motor is first a rotor and second, a start and between both there is no electrical connection. For constructing these elements material having high magnetic core are used so as to reduce eddy current loss and hysteresis. 

Working of three phase induction motors 

To understand working of a 3 phase induction motor. Consider conduction on a stationary rotor which is subjected to magnetic field which is produced when a three phase supply is connected with three phase winding of stator. When rotation of magnetic is in clockwise direction it will have same to same effect as when conduction is moving in anticlockwise in stationary field. According to faradays electromagnetic induction law, in these cases voltage is usually induced in conductor. 

One of the biggest benefits of using a 3 phase induction motor is that it do not need any extra arrangement or starting mechanism because they are capable enough of generating torque themselves when 3 phase AC supply is given to them unlike a synchronous motor. While on other hand, a single phase induction motor require kind of arrangement for starting torque. As a result the final output of any three phase induction motor will always be somewhere around 1.5 times than that of a single phase motor with same size.