During operation, a current is applied through the stator, which induces a magnetic field and leads to the rotation of the rotor. The rotational speed of the shaft and the applied torque is dependent on the operating frequency and the number of pole pairs in the motor’s windings.
Where are AC induction motors used?
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.
How does an AC induction motor work?
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 are the applications of induction motor?
AC induction motors are the most common electric motors in the world. These simple, reliable and economical motors are found in refrigerators, washing machines and furnaces, as well as conveyors, pumps, winders, wind tunnels and other industrial equipment.
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 starts rotating and the induction motor starts. … At the time of starting, the motor slip is unity, and the starting current is very large.
How do you reverse an AC motor?
In order to reverse the direction of an AC motor, the magnetic fields must be altered to provoke movement in the opposite direction. Since each wire consists of a positive and negative current within the magnetic fields, the flip-flopping of main and starter wires causes the motor to run in reverse rotation.
Which motor is used in air conditioner?
What is difference between induction motor and synchronous motor?
A three phase Synchronous motor is a doubly excited machine, whereas an induction motor is a single excited machine. The armature winding of the Synchronous motor is energized from an AC source and its field winding from a DC source. The stator winding of Induction Motor is energized from an AC source.
Do AC 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).
What is rewinding of motor?
Electric motors are a vital part of most military, industrial, or civilian vessels. … But what is motor rewinding, exactly and how is it different from the regular process of motor repair? Put simply, it’s an armature winding process that enables your old motor to regain some – or even all – of its original efficiency.
How are winding turns calculated?
Call the number of turns N and the length l. Calculate the inductance associated with the winding using the formula L = (u0 * A * N^2)/l where u0 is the permeability of free space at 12.56 x 10^-7. If N is 100 turns, l is 6 meters and A is 7.069 square meters.
How does a motor winding work?
Motor Winding and Its Types. … Most of the motors work on the principle of interaction among the electric current as well as the magnetic field within a wire winding. This can generate force in the form of shaft rotation. These motors can be powered with DC or AC sources.
Which motor is used in fan?
What are the applications of 3 phase induction motor?
Applications of Three Phase Induction Motor
- Large capacity exhaust fans.
- Driving lathe machines.
- Oil extracting mills.
- Textile and etc.
What are the advantages of induction motor?
Induction Motor Advantages:
- Induction motors are simple and rugged in construction. …
- Induction motors are cheaper in cost due to the absence of brushes, commutators, and slip rings.
- They are maintenance free motors unlike dc motors and synchronous motors due to the absence of brushes, commutators and slip rings.