What is the 3 phase induction motor?
A 3 phase induction motor derives its name from the fact that the rotor current is induced by the magnetic field, instead of electrical connections. The operating principle of a 3 phase induction motor is based on the production of r.m.f.
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 are the applications of 3 phase induction motor?
Application of 3-Phase Induction Motors
- Pumps and submersible.
- Pressing machine.
- Lathe machine.
- Grinding machine.
- Conveyor.
- Flour mills.
- Compressor.
- And other low mechanical power applications.
What is the three phase induction motor working principle?
The working of the three-phase induction motor is based on the principle of electromagnetic induction. When three-phase stator winding of an induction motor is energized from a 3 phase supply, a rotating magnetic field is set up which rotates around the stator at synchronous speed (Ns).
Is 3-phase induction motor is self starting?
Three-phase induction motor is self-starting, because winding displacement is 120 degrees for each phase and supply also has 120 phase shift for 3-phase. It results in a unidirectional rotating magnetic field is developed in air gap which causes 3-phase induction motor to self-start.
What are the advantages of 3-phase induction motor?
Unlike synchronous motors, a 3 phase induction motor has a high starting torque, good speed regulation and reasonable overload capacity. An induction motor is a highly efficient machine with full load efficiency varying from 85 to 97 percent.
What are the types of induction motors?
Types of Induction Motors
- Split Phase Induction Motor.
- Capacitor Start Induction Motor.
- Capacitor Start and Capacitor Run Induction Motor.
- Shaded Pole Induction Motor.
What is advantage and disadvantage of induction motor?
Induction motors always operate under lagging power factor and during light load conditions they operate at very worst power factor (0.2 to 0.4 lagging). Some of the disadvantages of poor power are increase in I2R losses in the system, reduction in the efficiency of the system.
What are the two types of 3-phase induction motor?
There are three types of 3- phase induction motors namely plain or squirrel cage induction motor, slip-ring or wound rotor induction motor and double cage rotor induction motor.
Which type of motor is not self starting?
single-phase induction motors
We can easily conclude that the single-phase induction motors are not self-starting because the produced stator flux is alternating in nature and at the starting, the two components of this flux cancel each other, and hence there is no net torque.
Why is three phase induction motor is self starting?
The current carrying rotor being placed in a magnetic field experiences a torque and hence begins to rotate in the direction of rotating magnetic field. Thus we see that Induction Motor is self-starting. It does not require nay external mean to rotate.
Why are induction motors better?
The motor shaft rotates. Induction Motors induce the magnetic field within the rotor by implanting a short current in the squirrel cage. This concept effects higher losses in the rotor and causes higher heat and less efficiency. Higher efficiency motors use copper because of its better electromagnetic behaviour.
What are the disadvantages of a three phase induction motor?
The disadvantages of 3 phase induction motor are: The induction motors have a poor starting torque. As a result, they draw inrush currents causing momentary voltage drop. So the motor is not suitable for high power applications like traction systems etc.
What is the principle of 3 phase induction motor?
The working principle of Three phase Induction Motor is basically based on the principle of mutual induction as in case of transformer. The major difference between them is that transformer is static in nature i.e. it doesn’t have any moving parts whereas Induction Motor is a dynamic one.
What is purpose of three phase induction motor?
Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. Single-phase induction motors are used extensively for smaller loads, such as household appliances like fans. Although traditionally used in fixed-speed service,…
Why is 3 phase induction motor used?
Three-phase AC induction motors are widely used in industrial and commercial applications. Induction motors are used in industry and domestic appliances because these are rugged in construction requiring hardly any maintenance, that they are comparatively cheap, and require supply only to the stator.
