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Used in almost every process, induction motors are mainly used in water pumps, kitchen appliances, fans and air conditioners, automobiles and common industrial machinery like boiler pumps and compressors.
Where are induction motors used?
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, May 5, 2016.
Where are AC motors used?
Some of the most common industrial applications for AC motors include: Appliances. Compressor drives and systems. Computers. Conveyor systems. Fans and air conditioners. Hydraulic and irrigation pumps. Transportation equipment.
When was the AC induction motors used?
1888 – The AC induction motor is patented It wasn’t suitable for road vehicles but it was later adapted by Westinghouse engineers. In 1892 the first practical induction motor was designed, followed by a rotating bar winding rotor, making the unit suitable for use in automotive applications.
Why AC is used in induction motor?
An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be made without electrical connections to the rotor.
What three things are needed for an induction motor to work?
A 3-phase induction motor includes two essential components namely the stator & the rotor. In this motor, the stationary part is the stator whereas the rotating part is the rotor. In this motor, the load is connected to the shaft. Three-phase armature winding can be wound over the stator.
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 disadvantages of AC motors?
Disadvantages of AC motors The start ability and speed regulation of the AC motor are poor, and it need frequency conversion equipment to adjust the speed; 2. Must be connected to AC power to use, subject to space restrictions.
Can DC motors run on AC?
In fact, DC Series can run on both AC and DC supply. But the original AC series motor has the different construction from a DC series motor. Because of the manufacturer design the AC Series motor to reduce losses.
What are the disadvantages of DC motors?
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).
Is AC motor and induction motor same?
The two main types of AC motors are induction motors and synchronous motors. The induction motor (or asynchronous motor) always relies on a small difference in speed between the stator rotating magnetic field and the rotor shaft speed called slip to induce rotor current in the rotor AC winding.
What is AC motor principle?
The fundamental operation of an AC Motor depends on the principle of magnetism. The simple AC Motor contains a coil of wire and two fixed magnets surrounding a shaft. When an electric (AC) charge applies to the coil of wire, it becomes an electromagnet. This electromagnet generates a magnetic field.
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 is better AC or DC?
Alternating current is cheaper to generate and has fewer energy losses than direct current when transmitting electricity over long distances. Although for very long distances (more than 1000 km), direct current can often be better.
What are the advantages of AC motors?
An AC motor reduces power line disturbances, lowers power demand on start, offers controlled acceleration, controlled starting current, adjustable operation speed, and adjustable torque.
How do I know if a motor is AC or DC?
Look for the stator core construction and rotor. If there is no commutator, then it is a AC motor. If there is a commutator and brushes, it may be either a DC motor or an AC commutator motor (Universal motor).
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.
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.
Do AC induction motors have brushes?
AC induction motors have no brushes and have a much longer life expectancy. DC motor speed is controlled by varying the armature current, while AC motor speed control is achieved by varying the frequency of the alternating current, often with a variable frequency drive(VFD).
Which starting method is best for induction motor?
1. Direct On Line Starter It is simple and cheap starter for a 3-phase induction motor. The contacts close against spring action. This method is normally limited to smaller cage induction motors, because starting current can be as high as eight times the full load current of the motor.
What are the advantages of induction motor?
Advantages of an induction motor (IM): The working of an induction motor is very simple. It is very cheap in cost to compare the other motors. It is a highly efficient motor. The brushes are not used in an induction motor. The maintenance of IM is very less compared to the DC motor and synchronous motor.
What is the cost of induction motor?
Questions & Answers on Induction Motors No of Phase Min Price Max Price Single Phase Rs 2200/Piece Rs 22093/Piece Three Phase Rs 2100/Piece Rs 47148/Piece.
