Difference between Synchronous motor and Induction motor | vlozodkaz.info
AC motors can be divided into two main categories - (i) Synchronous motor and ( ii) Asynchronous motor. An asynchronous motor is popularly called as Induction. An induction motor or asynchronous motor is an AC electric motor in which the electric current . Similar is the operation of the induction motor in parallel with a synchronous motor serving as a . The typical speed-torque relationship of a standard NEMA Design B polyphase induction motor is as shown in the curve at right. As per the equivalent circuit representation, a three phase Induction Motor is generalized transformer but there are some differences between.
Cascade The speed of a pair of slip-ring motors can be controlled by a cascade connection, or concatenation.Induction motor vs Synchronous motor -- difference between synchronous and asynchronous
The rotor of one motor is connected to the stator of the other. Variable-frequency drive Main article: The most common efficient way to control asynchronous motor speed of many loads is with VFDs.
Difference between Induction Motor and Transformer | Electrical Concepts
Note the interleaving of the pole windings and the resulting quadrupole field. The stator of an induction motor consists of poles carrying supply current to induce a magnetic field that penetrates the rotor. To optimize the distribution of the magnetic field, windings are distributed in slots around the stator, with the magnetic field having the same number of north and south poles.
Induction motors are most commonly run on single-phase or three-phase power, but two-phase motors exist; in theory, induction motors can have any number of phases.
Single-phase motors require some mechanism to produce a rotating field on startup. Cage induction motor rotor's conductor bars are typically skewed to avoid magnetic locking.
- Induction Motor Rotating Transformer Relation
- Difference between Synchronous motor and Induction motor
- SIMILARITY BETWEEN INDUCTION MOTOR AND TRANSFORMER (Motors And Drives)
Since an open, drip proof ODP motor design allows a free air exchange from outside to the inner stator windings, this style of motor tends to be slightly more efficient because the windings are cooler. At a given power rating, lower speed requires a larger frame.
In the case of three-phase, reversal is straightforwardly implemented by swapping connection of any two phase conductors. In a single-phase split-phase motor, reversal is achieved by changing the connection between the primary winding and the start circuit.
Some single-phase split-phase motors that are designed for specific applications may have the connection between the primary winding and the start circuit connected internally so that the rotation cannot be changed. Also, single-phase shaded-pole motors have a fixed rotation, and the direction cannot be changed except by disassembly of the motor and reversing the stator to face opposite relative to the original rotor direction. Power factor[ edit ] The power factor of induction motors varies with load, typically from around 0.
Induction motor - Wikipedia
For economic and other considerations, power systems are rarely power factor corrected to unity power factor. Various regulatory authorities in many countries have introduced and implemented legislation to encourage the manufacture and use of higher efficiency electric motors.
There is existing and forthcoming legislation regarding the future mandatory use of premium-efficiency induction-type motors in defined equipment. For more information, see: Steinmetz equivalent circuit[ edit ] Many useful motor relationships between time, current, voltage, speed, power factor, and torque can be obtained from analysis of the Steinmetz equivalent circuit also termed T-equivalent circuit or IEEE recommended equivalent circuita mathematical model used to describe how an induction motor's electrical input is transformed into useful mechanical energy output.
The equivalent circuit is a single-phase representation of a multiphase induction motor that is valid in steady-state balanced-load conditions.
Rotor winding is fed with a DC supply with the help of slip rings. A rotor with permanent magnets can also be used.
Differences between Transformer and Induction Motor
Synchronous motor Induction motor: Stator winding is similar to that of a synchronous motor. It is wound for a specific number of poles. A squirrel cage rotor or a wound rotor can be used. In squirrel cage rotor, the rotor bars are permanently short-circuited with end rings. In wound rotor, windings are also permanently short-circuited, hence no slip rings are required.
Induction motor Difference in working Synchronous motor: Stator poles rotate at the synchronous speed Ns when fed with a three phase supply. The rotor is fed with a DC supply. The rotor needs to be rotated at a speed near to the synchronous speed during starting.
Synchronous motor always runs at a speed equal to its synchronous speed. The rotor current gives rise to the rotor flux. According to Lenz's lawthe direction of this induced current is such that it will tend to oppose the cause of its production, i.