What is the difference between induction motor and transformer?
A transformer transfers electrical power from one circuit to another without changing the supply frequency, i.e. it only step-up or step-down the level of voltage and current, whereas induction motor converts electrical power into mechanical power.
What is similarity between transformer and induction motor?
Can we use induction motor as transformer?
Why is transformer used in induction motor?
What is the difference between electric motor and induction motor?
What is the difference between synchronous machine and induction machine?
The fundamental difference between these two motors is that the speed of the rotor relative to the speed of the stator is equal for synchronous motors, while the rotor speed in induction motors is less than its synchronous speed.
How does an induction motor develop torque?
An induction motor develops torque by inducing current to the rotor, which is proportional to the differential speed of the rotor and the rotating magnetic field in the stator. For NEMA design B motors the differential speed (called slip) is between 1% and 2% at full load.
How do you find the stator current?
The stator current is calculated by dividing the phase voltage by the equivalent complex impedance of the entire circuit shown. The speed of the stator magnetic field in radians per second is 4xPixf/poles. The speed of the rotor (mechanical speed) is the speed of the stator magnetic field minus the slip.
What is the difference between synchronous motor and induction motor?
A synchronous motor is a doubly excitation machine, i.e., its armature winding is connected to an AC source and its field winding is excited from a DC source. An induction motor is a singly excited machine, that is, its stator winding is energized from an AC source. Its speed is independent of the load.
How does an induction generator work?
An induction generator produces electrical power when its rotor is turned faster than the synchronous speed. For a four-pole motor (two pairs of poles on stator) powered by a 60 Hz source, the synchronous speed is 1800 rotations per minute (rpm) and 1500 RPM powered at 50Hz.
How many poles does a 3-phase motor have?
On a three-phase motor the pole pattern has to be repeated for each phase. Therefore a 2=pole, 3-phase motor will have six poles.
How does a single phase motor work?
Single phase motors work on the same principle as 3 phase motors except they are only run off one phase. A single phase sets up an oscillating magnetic field that goes back and forth rather than a rotating magnetic field (see bottom figure). Because of this a true single phase motor has zero starting torque.
How does a 3-phase synchronous motor work?
A three-phase AC supply is connected to the stator winding and a DC voltage is applied to the rotor field winding. The stator winding produces a rotating magnetic field which revolves around the stator at synchronous speed.
How does slip ring induction motor works?
Each slip ring is connected to one of the three phases of rotor windings. The slip ring brushes, made of graphite, are connected to a resistive device, such as a rheostat. As the slip rings turn with the rotor, the brushes maintain constant contact with the rings and transfer the resistance to the rotor windings.
How does a single-phase AC motor work?
Single phase motors work on the same principle as 3 phase motors except they are only run off one phase. A single phase sets up an oscillating magnetic field that goes back and forth rather than a rotating magnetic field (see bottom figure). Because of this a true single phase motor has zero starting torque.
How do you measure voltage on a rotor?
The frequency of a voltage or current induced due to the relative speed between a vending and a magnetic field is given by the general formula; Frequency = PN /120 Where N = Relative speed between magnetic field and the winding P = Number of poles For a rotor speed N, the relative speed between the rotating flux and …
What is slip in induction motor?
In an electrical coupling, slip is defined simply as the difference between the speeds of the two rotating members. In an induction motor, slip is a measure of the difference between the machine’s synchronous speed and its shaft speed.
Are wind generators AC or DC?
Wind pumping systems are designed to use direct current (DC) provided by a wind turbine, although some newer versions use a variable frequency AC motor and a three phase AC pump controller that enables them to be powered directly by wind turbines.
How does a permanent magnet synchronous generator work?
The permanent magnet synchronous generator works using an excitation field generated from a permanent magnet, not from a coil. Then, that the magnetic flux is produced by a permanent magnetic field. The purpose of this paper is to obtain a low-speed PMSG design for small-scale wind power applications.
What does a stator do in a generator?
In an electric motor, the stator provides a magnetic field that drives the rotating armature; in a generator, the stator converts the rotating magnetic field to electric current. In fluid powered devices, the stator guides the flow of fluid to or from the rotating part of the system.
How does a shaded pole motor start?
Definition: A shaded pole induction motor is a simple single-phase induction motor, which is self-starting with one of the poles shaded by the copper ring. The other name of the copper ring is a shaded ring, where it acts as a secondary winding motor.