Table of Contents
Unlike DC motors, induction motors are robust i.e. their mechanical construction is stronger, which enables them to be used in a tough industrial environment that other motors cannot withstand.
Why induction motor are extensively used these days?
Some of the key points that why induction motor is widely used in industry? The induction motor is a singly excited motor whereas the synchronous motor is a doubly excited one. The induction motor is cheaper than a synchronous motor. Induction motor robust in construction and it can also work in any dusty environment.
Why induction motor is said to be most widely used AC motor?
Motor Drives The ac induction motor is by far the most widely used motor in the industry. The underlying reason for this is the fact that the cage induction motor is much cheaper and more rugged than its competitor, the dc motor, in such applications.
Which motor is mostly used in industry and why?
AC motors include 3-phase and single phase types. 3-phase AC induction motors are the most widely used motors in industrial and commercial applications.
Why do we use induction motor instead of DC?
AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.
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 disadvantages of induction motor?
Disadvantages of induction motor: The power factor of the motor is very low during light load conditions. During light load conditions, it operates at a very low power factor. It has low efficiency. Single-phase induction motor is not self-starting.
How does an induction motor start?
When the supply is connected to the stator of a three-phase induction motor, a rotating magnetic field is produced, and the rotor begins rotating and the induction motor starts. At the time of starting, the motor slip is unity, and the starting current is very large.
What are the types of induction motor?
Induction motors are classified into two types namely single phase induction motor and three-phase induction motor. As their name suggests, a 1-phase induction motor is connected to a single-phase AC power supply whereas the 3-phase induction motor can be connected to a three-phase AC power supply.
What is the principle of induction motor?
Working Principle of Induction Motor The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.
Which motor is used in tramway?
Dc motor (Ma) and induction motor (Mc) are currently manufactured and used in 105 N tram drive, their parameters are available. Dc motor (Mb), brushless motor (Me) and slip-ring motor (Md) pa- rameters have been determined by analysis.
Which motor is used in paper mill?
Induction motors are the most efficient motors in terms of usage in manufacturing plants and mills. The paper mill uses induction motor and drives at various stages. The main motor runs at a constant speed and variation in its speed affects the quality of paper severely.
Which motor is used in industry?
The majority of industrial motors are three-phase AC induction motors due to its reliability and low cost.
What is the full meaning of dc motor?
What is a DC Motor? A direct current (DC) motor is a type of electric machine that converts electrical energy into mechanical energy. DC motors take electrical power through direct current, and convert this energy into mechanical rotation.
What are the advantages of DC motors?
Good speed control DC motors offer highly controllable speed. By changing the armature or field voltage it’s possible to achieve wide speed variation and with this level of controllability, DC motors offer the precision required by a wide range of industry applications.
What are the disadvantages of DC motor?
Disadvantages of DC motors High initial cost. Increased operation and maintenance cost due to the presence of commutator and brush gear. Cannot operate in explosive and hazard conditions due to sparking occur at brush (risk in commutation failure).
What is the main disadvantage of synchronous motors?
Disadvantages or Demerits: Synchronous motors requires dc excitation which must be supplied from external sources. Synchronous motors are inherently not self starting motors and needs some arrangement for its starting and synchronizing. The cost per kW output is generally higher than that of induction motors.
What is the main disadvantage of 1ph induction motors?
1. The main disadvantage of an induction motor is, it draws a very high inrush current during its starting, for this reason, it makes a dip in voltage during starting which can affect other electrical loads connected to the same power source.
What are the main parts of induction motor?
Parts of Induction Motors Stator. The stator is the stationary portion of the motor and delivers a rotating magnetic field to interact with the rotor. Rotor. The rotor is the central component of the motor, and is fixed to the shaft. Shaft. The motor shaft is fixed within the rotor, and rotates with it. Bearings. Casing.
Which induction motor has maximum speed?
Synchronous and full load speed of amplitude current (AC) induction motors Speed (rpm) Number of Poles Frequency (Hz, cycles/sec) Synchronous Full Load 2 3600 2900 4 1800 1450.
What is the difference between normal motor and induction motor?
The stator winding of Induction Motor is energized from an AC source. Synchronous Motor always runs at synchronous speed, and the speed of the motor is independent of load, but an induction motor always runs less than the synchronous speed. If the load increased the speed of the induction motor decreases.
Are induction motors good?
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.