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Transformer action. There is no electrical connection between the stator and the rotor, and voltages get induced into the rotor bars when they are swept by lines of magnetic flux created by the stator windings.
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How do you check number of poles on a three phase induction motor?
Name plate data should indicate the number of poles / RPM. For speed N= (120 x Frequency) / Number of poles Using this formula you can find out the number of poles, provided you have other parameters available. If no data is available, run the motor on no load, and measure the rpm, know the frequency, calculate the poles.
What is another name for an ac generator?
an induction generator
Can a 3 phase motor run off 110 volts?
Yes. You will need to supply each phase with a separate 110V supply line. However make sure that the motor is designed to run at that voltage. Running the motor on load at a lower voltage than that which is on the name plate is dangerous because the motor will try to compensate for the reduction in power due to the lower voltage by demanding higher currents from the source. This will either result in damaging the motor or control circuits or causing bodily harm to yourself or someone else. Good luck.
What is the operating voltage of a brushless DC motor?
the voltage on the name platethere is no dc involved unless the motor is stoppedits a magnet on a shaft with electro magnets around itthis is called a synchronous motor when run with acor a stepper motor with pulsed dcor a brake with dcComment.Look at the motor's Name Plate.
What motor can only operate on alternative current?
The name of the motor that can only operate on alternative current is called the AC motor. The AC motor consists of 2 basic parts with a rotor that is attached to the output shaft.
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.
What happen if we do the 3 phase winding in rotor of induction motor and give the 3 phase supply only stator winding?
This is how an induction motor normally works, hence the name. The supply voltage is connected to the stator winding(s) and a current is induced in the rotor. A synchronous motor, on the other hand, will have current supplied to the rotor through slip rings and brushes. The rotor current is generally supplied as DC though, or else rectified in the rotor.
How can you determine if a electric motor is 1 phase or 3 phase if there is no name plate?
Check the motor's terminal box. If there are three service input cables - such as red, yellow and blue - plus an earth wire, then it is a three phase motor. If there are only two wires plus an earth wire, then it is single phase.
Name of the first electric motor?
The first electric motor was the Faraday Motor, invented by Michael Faraday in 1821. This motor was a very rude motor, you have motion from electric energy, but no useful work. In 1831 he discovered electromagnetic induction and invented the first induction motor. See links below for more info.
How many amps does a 5 hp 208 volt 3 phase motor draw?
read the name plate on the motor
What is name of motor having 3phase winding single phase winding with permanent magnet and a tachogenerator?
Its a servo.
How do you check number of poles on a three phase induction motor?
Name plate data should indicate the number of poles / RPM. For speed N= (120 x Frequency) / Number of poles Using this formula you can find out the number of poles, provided you have other parameters available. If no data is available, run the motor on no load, and measure the rpm, know the frequency, calculate the poles.
Why induction motor is also called short circuit transformer?
Like transformer induction motor has stator winding(Primary winding) and rotor winding(Secondary winding) separated by an airgap.Rotor winding(generally Al bars) are short circuited at the end to produce torque for the rotation.Hence the name short circuited transformer.
Vlotage on motor name plate is line or phase voltage?
The voltage tag on a motor says 120 or 220 volt and some motors have jumpers to wire it for either one. That is the supply line voltage. The motor knows how to use that. If the plate says three phase is required then consult your electic supply Company for a three phase supply line.
What happens if the high and low speed wires are switched on a 3 phase motor?
I am guessing that what you are talking about is a two speed motor. The motor should have 6 wires coming out of it. There are two complete sets of three phase windings for each speed. Look on the motor name plate for the wire numbers or sometimes on the inside of the motor junction box. A 2 speed 6 lead motor should have the following markings, 1U 1V 1W for slow 2U 2V 2W for fast. Also check for the two different amp draws for each winding. These types of motors should be run from a reversing type contactor assemble so that individual overloads can be used on each of the high speed windings and on the low speed windings.
How do you calculate the power rating of three phase induction motor when name plate is not available?
For a 3 phase motor, the voltage is 415. Being an inductive load the power factor is commonly .85 The constant for 3 phase circuit is 1.732 You need to run the motor on no load and you use clamp meter to take the no load current. In considering the fact that on no load the measured current should not be more than 0.5 of the rated. Assuming , under normal condition the no load current is 10 amps. Then the load current will be 20 amps. Then from above and in using the formula P=I*V*p.f*1.732 Therefore P= 20*415*0.85*1.732. P=12.3 kw Thank you. Bankole 2348035447224
Why mathematical induction is a deductive process?
"Mathematical induction" is a misleading name. Ordinarily, "induction" means observing that something is true in all known examples and concluding that it is always true. A famous example is "all swans are white", which was believed true for a long time. Eventually black swans were discovered in Australia. Mathematical induction is quite different. The principle of mathematical induction says that: * if some statement S(n) about a number is true for the number 1, and * the conditional statement S(k) true implies S(k+1) true, for each k then S(n) is true for all n. (You can start with 0 instead of 1 if appropriate.) This principle is a theorem of set theory. It can be used in deduction like any other theorem. The principle of definition by mathematical induction (as in the definition of the factorial function) is also a theorem of set theory. Although it is true that mathematical induction is a theorem of set theory, it is more true in spirit to say that it is built into the foundations of mathematics as a fundamental deductive principle. In set theory the Axiom of Infinity essentially contains the principle of mathematical induction. My reference for set theory as a foundation for mathematics is the classic text "Naive Set Theory" by Paul Halmos. Warning: This is an advanced book, despite the title. Set theory at this level really only makes sense after several years of college/university mathematics study.
