Frequently Asked Questions (FAQ) for Asynchronous Motor

what is induction motor?

"An induction motor or asynchronous motor is a type of alternating current motor where power is supplied to the rotor by means of electromagnetic induction. An electric motor turns because of magnetic force exerted between a stationary electromagnet called the stator and a rotating electromagnet called the rotor. Different types of electric motors are distinguished by how electric current is supplied to the moving rotor. In a DC motor and a slip-ring AC motor, current is provided to the rotor directly through sliding electrical contacts called commutators and slip rings. In an induction motor, by contrast, the current is induced in the rotor without contacts by the magnetic field of the stator, through electromagnetic induction. An induction motor is sometimes called a rotating transformer because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side. Unlike the normal transformer which changes the current by using time varying flux, induction motors use rotating magnetic fields to transform the voltage. The current in the primary side creates an electromagnetic field which interacts with the electromagnetic field of the secondary side to produce a resultant torque, thereby transforming the electrical energy into mechanical energy."

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what is different between induction motor and direct drive motor for hvac? please help me?

PSC motors, often referred to as induction motors, typically use alternating current (AC) and include two key components in their design - a stator (the stationary section of the motor) and a rotor (the rotating section of the motor). A magnetic field is induced in the rotor opposite in polarity of the magnetic field in the stator. Therefore, as the magnetic field rotates in the stator, the rotor also rotates to maintain its alignment with the stator's magnetic field. In this operation, the rotor constantly lags behind the magnetic field in the stator, resulting in what is known as asynchronous (i.e., not synchronized) operation. This operational characteristic, which also generates excessive heat, greatly contributes to the degraded operational efficiency of PSC motors (which are at best only 60 percent efficient). However, since there are few mechanical components, this design has proven to be very simple and reliable, and can be manufactured at a relatively low cost. more:

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phase motor to generator?

bypass on eBay, sell it and purchase a generator. in straight forward terms everlasting-magnet vehicles would nicely be utilized as turbines. nicely, that's no longer quite authentic. Shunt-wound vehicles would nicely be utilized as turbines if and given which you organize for some potential of excitation -- you will would desire to grant ability to the armature. Induction vehicles (the main hardship-unfastened variety) place self belief in a contemporary being led to interior the armature by potential of the stator to magnetise the armature. Self-exciting alternators have a stator this is an electromagnet with a extreme-remanence steel center, related to a rectifier diode. The remanent magnetism interior the armature starts inducing a contemporary interior the stator, which induces a contemporary back into the armature; the diode ensures that the armature is in basic terms ever magnetised in one path (in any different case there could be no output)

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does an asynchronous generator consume or produce reactive power?

Although we say that a motor requires reactive volt-amperes and a capacitor acts as a source of reactive volt-amperes, I think that it is confusing to say that reactive power is consumed. Reactive power is not consumed in the sense that real electrical power is consumed by the conversion of electrical energy to heat or mechanical work. Reactive power represents the continuous transfer of electrical energy back and forth between the magnetic field in an induction motor and the electric field in a capacitor or the magnetic field in a synchronous generator. An induction (asynchronous) generator must have its magnetic field maintained through the same mechanism as an induction motor. It must exchange energy with a capacitor or with a synchronous generator that can be adjusted to act as a capacitor. In order to function as a generator, an induction generator requires an external source of reactive volt-amperes. That source can be a capacitor, but it is difficult to get an induction generator started unless it is initially connected to an energized AC source.

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what is synchronous speed?

For the best answers, search on this site In an electric motor torque is developed by interaction of the rotor flux and the stator flux. In order to develop a continuous torque the fluxes must be fixed relative to one another as the motor rotates. If they are not fixed, then the torque fluctuates both positive and negative and the net torque is zero. In a synchronous machine the position rotor flux is fixed relative to the rotor. Therefore, the rotor speed must be the same as the rotational speed of the stator flux. In an asynchronous motor the rotor flux move slowly relation to the rotor. Rotor flux is produced by induction which will occur only if there is some difference between the rotor speed and the stator speed (called slip). Therefore, in order for the fluxes to be fixed relative to one another there must be some difference between the stator flux speed and the rotor speed.

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What is an induction motor?

An induction motor or asynchronous motor is a type of alternating current motor where power is supplied to the rotor by means of electromagnetic induction. An electric motor converts electrical power to mechanical power in its rotor (rotating part). There are several ways to supply power to the rotor. In a DC motor, this power is supplied to the armature directly from a DC source while, in an induction motor, this power is induced in the rotating device. An induction motor is sometimes called a rotating transformer because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side. Unlike the normal transformer which changes the current by using time varying flux, induction motors use rotating magnetic fields to transform the voltage. The current in the primary side creates an electromagnetic field which interacts with the electromagnetic field of the secondary side to produce a resultant torque, thereby transforming the electrical energy into mechanical energy. Induction motors are widely used, especially polyphase induction motors, which are frequently used in industrial drives. Induction motors are now the preferred choice for industrial motors due to their rugged construction, absence of brushes (which are required in most DC motors) andthanks to modern power electronicsthe ability to control the speed of the motor.

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Why dc supply is given to exiter? does we give ac supply?

There are different types of generator that use AC excitation. The common generators called alternators use DC field excitation, and are called a synchronous generator, like a synchronous motor. Add a commutator to produce DC and it is like a DC motor too. The asynchronous generator is also called an induction generator. Like an induction motor it generates a suitable field by transformer action using AC excitation. If an induction motor (think of 3 phase types) is connected across an AC supply it spins as a motor, below the synchronous speed. If it is driven by a mechanical source to above the synchronous speed, it acts as a generator, delivering power to the same AC source which is also its excitation. There are variations of this, including using an inverter for excitation. These are sometimes used with wind generators, those that are grid connected probably, because the shaft speed may be different to the output frequency.

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Do we always have field windings as rotor and armature windings as stator?

Windings can be classified in two groups: armature windings and field windings. The armature winding is the main current-carrying winding in which the electromotive force (emf) or counter-emf of rotation is induced. The current in the armature winding is known as the armature current. The field winding produces the magnetic field in the machine. The current in the field winding is known as the field or exciting current. See Electric rotating machinery, Generator, Motor. The location of the winding depends upon the type of machine. The armature windings of dc motors and generators are located on the rotor, since they must operate in conjunction with the commutator, and the field windings are mounted on stator field poles. See Direct-current generator, Direct-current motor. Alternating-current synchronous motors and generators are normally constructed with the armature winding on the stator and the field winding on the rotor. There is no clear distinction between the armature and field windings of ac induction motors or generators. One winding may carry the main current of the machine and also establish the magnetic field. It is customary to use the terms stator winding and rotor winding to identify induction motor windings. The word armature, when used with induction motors, applies to the winding connected to the power source (usually the stator).

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If you rotate an electric motor by some external source, will it produce power?

Yes you are right. The basic principle of a generator is a conductor moving in a magnetic field. The voltage is proportional to the strength of the magnetic field, the speed the conductor cuts through this field, and the number of turns in the coil. The current generated in an electrical load connected to the generator causes a reaction through the magnetic field that requires more force to maintain the movement. A motor is the reverse principle, where an electrical current causes a magnetic field around a conductor that reacts agains a second magnetic field, so the two can move and so move a mechanical load. Some sort of switching arrangement is required to make this a continuous action. In principle all motors (including induction motors) can be used as generators, but the excitation can be tricky. These are generally called induction generators or asynchronous generators as opposed to the synchronous generator we usually call an alternator. Even a shaded pole induction motor like on small AC room fans generates a little AC when you spin it, presumable due to stray magnetic fields.

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what is the difference between asynchronous and synchronous generators?

Synchronous machines (either generators or motors) run synchronized with the system frequency. Asynchronous machines, also known as induction machines, (also either generators or motors) run at a speed slightly different from the system frequency. Synchronous machines 'lock' to the line through the action of their rotating DC-powered field winding. The DC magnetic field produced by this field winding is the means by which the mechanical energy is converted to electrical energy and transferred across the airgap of the machine. Asynchronous machines rely on a slight difference in speed between the line and their rotor windings (or squirrel cage) to induce current flow in the rotor, which allows for energy transfer across the airgap. The asynchronous generator is simply an induction machine run supersynchronously (above line frequency), with mechanical power input to the rotor shaft instead of output from the rotor shaft. While synchronous generators do not necessarily have to have an external source of excitation (it can be integral to the generator), induction generators require an external source of electrical excitation such as a connection to the grid.

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