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To calculate the speed of an induction motor use the following formula, RPM = Hz x 60 x 2/motor # of poles. To answer the question, most of the motors must have 4 poles.
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Your church organ bellows is powered by a repulsion start-induction motor It is arching quite a bit and does not start the first or sometimes the second time Could it be brushes or a dirty comutator?
"Induction" motors imply AC power Most AC motors do not have brushes or commutator If your motor does have brushes, a lot of sparking where the brushes meet the comutator is a good indication that it needs to be cleaned and/or "cutdown". If your motor does not have brushes, then you have more serious trouble. Need more details
Which motor is used for domestic purpose?
In the home induction motors are used the most, because they are reliable and last a long time. They are the favoured type for refrigerators and washing machines. The exception is portable appliances like vacuum cleaners and hand tools, which use commutator motors, basically the same as DC motors. These are preferred for their better power to weight ratio, even though they are noisy and require more maintenance such as replacement brushes and regular commutator cleaning. Some types of electric clock use small synchronous motors that have permanent magnets built into the rotor. These motors produce only a couple of watts of mechanical power at the most.
What is an ac motor?
An AC motor is an electric motor that runs on alternating current, like household electricity, as opposed to a DC motor that runs on direct current from a battery. Most AC motors work from the mains supply, which has a frequency of 50Hz in the UK and 60Hz in the USA. Other types are available that work like stepper motors and need a specialist supply to run them.
What is the principle of a three-phase induction motor?
An electric motor converts electrical energy into a mechanical energy which is then supplied to different types of loads. A.c. motors operate on an a.c. supply, and they are classified into synchronous, single phase and 3 phase induction, and special purpose motors. Out of all types, 3 phase induction motors are most widely used for industrial applications mainly because they do not require a starting device. A 3 phase induction motor derives its name from the fact that the rotor current is induced by the magnetic field, instead of electrical connections. The operating principle of a 3 phase induction motor is based on the production of r.m.f.
How much is skewing angle in three phase induction motor?
the skew angle varies from 0 degrees, depending on how much torque you want at near synchronous speed and how smoothly you want to transition with varying loads most motors all the shorting bars are parallel to shaft. skew is more often for lower current starting in motors that will turn on an off a lot
What Several ways we use electromagnetic induction in our daily lives?
Electromagnetic induction is the production of voltage across a conductor moving through a magnetic field. It underlies the operation ofgenerators, all electric motors, transformers, induction motors, synchronous motors, solenoids, and most other electrical machines.Also the metal detectors work on the principle of electromagnetic induction.
What is squirrel cage induction generator?
Squirrel cage type is a type of Induction motor. It tells that the rotor is "squirrel cage" type. Another type of induction motor is with "slip ring" type of rotor. Squirrel cage type is most widely used Induction motor.
Your church organ bellows is powered by a repulsion start-induction motor It is arching quite a bit and does not start the first or sometimes the second time Could it be brushes or a dirty comutator?
"Induction" motors imply AC power Most AC motors do not have brushes or commutator If your motor does have brushes, a lot of sparking where the brushes meet the comutator is a good indication that it needs to be cleaned and/or "cutdown". If your motor does not have brushes, then you have more serious trouble. Need more details
Why is a 3 phase induction motor is used in electric trains?
AC induction motors are not always used in trains as traction engines, however they are a popular choice. AC induction motors are very simple and reliable and aside from bearing wear they have no parts that wear out. This is because the power used by the rotating parts is supplied by the magnetism like in a transformer and so there are no slipping brushes. Most train systems actually use a DC supply, then a device called an inverter is used to convert the DC to variable frequency to drive the AC motor and control its speed. When this is done the AC induction motor is a very reliable and flexible engine and even allows energy recovery when the train is breaking.
How the motor starts?
An inductionor asynchronous motor is a type of AC motor where power is supplied to the rotor by means of electromagnetic induction, rather than a commutator or slip rings as in other types of motor. These motors are widely used in industrial drives, particularly polyphaseinduction motors, because they are rugged and have no brushes. Single-phase versions are used in small appliances. Their speed is determined by the frequency of the supply current, so they are most widely used in constant-speed applications, although variable speed versions, using variable frequency drives are becoming more common. The most common type is the squirrel cage motor, and this term is sometimes used for induction motors generally.
Which motor is used for domestic purpose?
In the home induction motors are used the most, because they are reliable and last a long time. They are the favoured type for refrigerators and washing machines. The exception is portable appliances like vacuum cleaners and hand tools, which use commutator motors, basically the same as DC motors. These are preferred for their better power to weight ratio, even though they are noisy and require more maintenance such as replacement brushes and regular commutator cleaning. Some types of electric clock use small synchronous motors that have permanent magnets built into the rotor. These motors produce only a couple of watts of mechanical power at the most.
What is an ac motor?
An AC motor is an electric motor that runs on alternating current, like household electricity, as opposed to a DC motor that runs on direct current from a battery. Most AC motors work from the mains supply, which has a frequency of 50Hz in the UK and 60Hz in the USA. Other types are available that work like stepper motors and need a specialist supply to run them.
What is the principle of a three-phase induction motor?
An electric motor converts electrical energy into a mechanical energy which is then supplied to different types of loads. A.c. motors operate on an a.c. supply, and they are classified into synchronous, single phase and 3 phase induction, and special purpose motors. Out of all types, 3 phase induction motors are most widely used for industrial applications mainly because they do not require a starting device. A 3 phase induction motor derives its name from the fact that the rotor current is induced by the magnetic field, instead of electrical connections. The operating principle of a 3 phase induction motor is based on the production of r.m.f.
How much is skewing angle in three phase induction motor?
the skew angle varies from 0 degrees, depending on how much torque you want at near synchronous speed and how smoothly you want to transition with varying loads most motors all the shorting bars are parallel to shaft. skew is more often for lower current starting in motors that will turn on an off a lot
Need of load test of squirrel cage induction motor?
usually you just need to read the name plate only the manufacturer needs to test to come up with numbers on the nameplate most common load for testing motors is a water brake dynamometer
Explain in detail the constructional details of three phase induction motor?
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, the 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. Many single-phase motors having two windings can be viewed as two-phase motors, since a capacitor is used to generate a second power phase 90 degrees from the single-phase supply and feeds it to the second motor winding. Single-phase power is more widely available in residential buildings, but cannot produce a rotating field in the motor, so they must incorporate some kind of starting mechanism to produce a rotating field. There are three types of rotor: squirrel cage rotors made up of skewed (to reduce noise) bars of copper or aluminum that span the length of the rotor, slip ring rotors with windings connected to slip rings replacing the bars of the squirrel cage, and solid core rotors made from mild steel. For information on die-cast copper rotors in energy-efficient induction motors, see: Copper die-cast rotors.
What is the working principle of ac motor?
AC commutator motors, like comparable DC motors, have higher starting torque and higher speed than AC induction motors. The series motor operates well above the synchronous speed of a conventional AC motor. AC commutator motors may be either single-phase or poly-phase. The single-phase AC version suffers a double line frequency torque pulsation, not present in poly-phase motor. Since a commutator motor can operate at much higher speed than an induction motor, it can output more power than a similar size induction motor. However commutator motors are not as maintenance free as induction motors, due to brush and commutator wear.
