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More Electrical Engineering Interview Questions, For more Electrical Engineering Interview Questions. CURRENT WILL BE DROWN AND DUE TO THE PRESENCE OF HIGH Coil will burn if the supply is applied continuously. also in case of dc supply the motor winding will not be able to withstand for long time and at last the motor winding will be damaged. Shunt wound DC motors are not suitable for AC operation because the difference in inductance between the armature and the field causes a relative phase shift between the armature current and the field current. of transformer bay. Applying AC to the motor will reverse polarity (60 cycles per second) causing the motor to buzz. In order to understand this, consider this question. An example is an electrically-powered arc welder. If excitation will increase, then what will be the effect the two sequence and parallel wound field dc autos have windings for the sector. ROTATE BUT THE FIELD WINDING IS LESS RESISTIVITY SO HIGH a) Will run at normal speed b) Will not run c) Will Run at lower speed d) Burn due to heat produced in the field winding 2. In this video i hv shown that, what will happen if i provide AC supply to DC motor. read the full article on can dc motor run on ac supply and vice versa full explanation What happens when we give ac supply to a dc motor? This article discusses the difference between ac motor and dc motor. >>When A.C. supply is given to a D.C. motor, 1)In case of Series connection of armature winding and field winding , it may run. Considering we are giving AC supply to DC shunt Motor. If DC is supplied it works like any DC series motor. A widely used motor is a dc motor changed to function on AC. But, In case of parallel connection , it won’t rotate at all and will start humming and will create vibrations, as a torque produced by positive and negative cycle will cancel out each other. No rotating magnetic field is generated and hence the motor will not rotate, instead a break is applied on the rotor for a sort period. Motors used in things like mains powered electric drills and vacuum cleaners are usually AC/DC motors - which is why you can do cheap and easy speed control on them. Very often we use ac motors as well. A hissing sound and a dampering will occur in motor it may The motor that converts the AC electrical power into mechanical power and is operated only at the synchronous speed is known as a synchronous motor. - Les Spécialités de Bayt.com Coils and solenoid may rapidly burn if connected to the DC supply. If AC is supplied, the stator and rotor field strengths will vary exactly in phase with each other. actually when dc supply is given to ac machine there will generate const field due to which rotor won't rotate, and also stator draws large current due to which i^2*r losses is more and hence more heat is generate ,due to which machine may burnt out...... sparks are produced between WTI and OTI in a transformer. Torque∝Iarmature×IfieldTorque∝Iarmature×Ifield. When the AC current changes direction, the stator and rotor fields will reverse at the exact same instant. A DC motor is any of a class of rotary electrical motors that converts direct current electrical energy into mechanical energy. (adsbygoogle=window.adsbygoogle||[]).push({}); (adsbygoogle=window.adsbygoogle||[]).push({}); What happens when AC supply is given to DC machines? what will be the effect. will not rotate, Before we discuss these modifications, here it is essential to discuss what is the need and where do we need to do modifications. AC motors only run when an alternating current is given as input. Without an inverter, the AC motor would operate at full speed as soon as the power supply is turned ON. motor will not rotate. Similarly, if the given input power supply is an AC one, then it is called as AC motor. An electric motor is a machine which can convert electrical energy into mechanical energy. Short answer: The motor will start rotating if it is a series dc motor. Short answer: The motor will start rotating if it is a series dc motor.Otherwise it depends. Devices are available for such conversion. How to identify Motor leads in their order coming out from 2)But, In case of parallel connection , it won’t rotate at all and will start humming and will create vibrations, as a torque produced by positive and negative cycle will cancel out each other. Watch this till the end, it will clear all your doubts regarding it. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current in part of the motor. torque T and speed ω from the mechanical port or output port. Asked by Wiki User. coil. When AC is applied to shunt motor inductive reactance of shunt winding reduces field current too much,c consequently shunt motor will not run on AC supply. CURRENT MOTOR WILL MAY BE BURNED. In general, larger DC motors are more complex including various shunt windings, etc. Long answer: A motor will only rotate if it experiences unidirectional torque. Depends on the magnitude of the DC supply and the DC resistance of the coil, heat will be generated on the coil. You may have this question in your mind so let's know. D.C. motor will be heated up. A rectifier blocks one of these flows, and thus creates DC. of assembled plug like anchor, Vinay 5/15 A. Diffrectiate between earthing and neutral. Wiki User Answered . For a DC motor to operate with AC current, the armature and field currents must reverse at exactly the same time, as they do when the windings are connected in series. What happens when ac supply given to dc motor justify? There are categories of DC autos. All Rights Reserved. a sort period. Differences between AC Motor and DC Motor are depends on construction, efficiency, price, losses etc. We know that the shunt winding of DC shunt Motor has large number of turns so that it has appreciate amount of inductance. What will happen if the back emf of a DC motor vanishes suddenly? The AC supply is used to drive an AC motor, usually an induction motor that drives a DC generator or dynamo. These motors are categorized into two types based on the input supply. Answers were Sorted based on User's Feedback. Answer. Answer / nd.palanivel. an eternal magnet dc motor won't artwork with a AC grant. a) The motor will stop b) The motor will continue to run c) The armature may burn d) The motor will run noisy 3. Same is the case of alternators. A It acts as DC motor B. of stator. the DC resistance of the coil, heat will be generated on the Contact Us. can we check the resistance of earthing electrode while it Basically AC motors would not work on DC supply but there's however an exception for a Universal motor also known as a series motor. Dc motor Hope you enjoy the video and this video will be usefull and you can easily do this process at home so watch untill end. The shunt field windings of both DC machines are independently excited through variable resistors. gave answer with calculation at my ID.... ravizak@ymail.com. Some machine like motors may not work properly or even damage (except the universal motors operated on both AC and DC). winding without tag (U1, V1, W1 & U2, V2, W2)? Terms of Service | Coil will burn if the supply is applied continuously. Synchronous Motor. Upvote (1) Downvote (0) Reply (0) Answer added by Deleted user 5 years ago . Here we have discussed Why DC is given to the field winding of Synchronous Motor. papers of recent jindal steel exam. Hence stator current will be very high,Motor will Why do we need a starter to start a DC motor? burn. 2010-06-30 22:45:45 2010-06-30 22:45:45. a c motor work properly but it becomes slow and dc motor not work What happen if DC supply given to Ac motor and Ac supply given to DC motor? then we gave 180v. DC motor may be run on AC supply but AC motor cannot run on DC supply.Effect of AC supply on DC Motor.Effect of DC supply on AC Motor. Otherwise it depends. The motors has a mechanical load that can be represented by an output power required to be delivered by the power supply . I've never paid much attention to how they work, but they look like normal DC motors with brushes (but without permanent magnets) - I suspect the armature and field coil are wired in series (like a car starter motor), this … What are the effects of electrical faults? Both of the motors have their own advantages and disadvantage. No back EMF will be generated, Depending upon the phase difference the torque can be positive, negative or zero. As we know that a transformer works only on AC. Consequently, Shunt motor will not usually run on A.C Supply. Parameter K relates the input and output port variables of the direct current motor. We use both types of machine for different works. But, for shunt motors, the motor never runs on AC supply. Hence, even if the voltage or current polarity changes due to AC supply it happens simultaneously for both the winding. For a series motor the field winding and the armature winding are connected in series. Hence, even if the voltage or current polarity changes due to AC supply it happens simultaneously for both the winding. it draws the excess current motor in not rorating due to dc motors are simpler if you have a dc supply to run them off. Copyright © 2005-2019 ALLInterview.com. The Shunt winding has a large number of turns so that it has appreciable inductance. Will it decrease or increase? if AVR fails in alternator. When A.C is applied to a shunt motor, the large inductive reactance of shunt winding will reduce the field current too much. No rotating magnetic field is generated and hence the motor What happens when DC supply is given to rotor in induction motor? When A.C. supply is given to a D.C. motor: 1)In case of Series connection of armature winding and field winding , it may run. That depends on the construction of the motor. is connected with the neutral of UPS system, how can we judge the percentage of load on the basis of temperature differences readings Why is magnetic locking or cogging not present in a DC motor? To reverse rotation either the leads to the rotor windings or to the stator windings are reversed (sometimes using a reversing switch).but both windings are not reversed. What happens if dc motor is connected to AC supply? what happens when a DC supply is given to AC motor?.. damage the motor severly and results in coil burn also. Rotor impedance will be remain isolated from equivalant ckt What will happen when we give an AC supply to DC series motor? Thus it depends on the phase difference. how many rpm of its motor. there. Top Answer. When supply is given to synchronous motor, a revolving field is set up. What will happen if DC shunt motor is connected across AC supply? will not rotate, instead a break is applied on the rotor for Both AC and DC motor do same work, both of them convert electrical energy into mechanical energy. on power factor? Long answer: A motor will only rotate if it experiences unidirectional torque.For a series motor the field winding and the armature winding are connected in series. So in series motor unidirectional torque is maintained and the motor continues rotating. Why the moulded plug comes with domestic appliances instead A DC gen requires a mechanical prime mover. For … However, in shunt motor the impedance of these windings are different and being parallel connected in nature the current flowing through them is definitely going to be different with a finite phase difference in them. what happens when a DC supply is given to AC motor?.. For instance, if the given power supply is a DC then, then it is called a DC motor. are more than 1 nos. 4: Commutators and Brushes: Commutators and brushes are absent in AC motors. when we gave dc supply to 220v dc motor its rpm is 1200. The DC output from the armature is directly connected to the armature of the DC motor (sometimes but not always of identical construction). In the DC motor above, the supply voltage E and current I is given to the electrical port or the input port and we derive the mechanical output i.e . why incomer bay is required before transformer bay if there This is because AC motors are designed to create a magnetic field, that starts the armature rotating. Basically, not much. How does sudden changes in load in a DC machine cause “flash over”? If an AC induction motor is applied with DC voltage,then due to unavailability of change in flux as in AC,the induction will not be possible. Therefore, it can not be stated explicitly for other motors (shunt or compound) without knowing their parameters. When A.C. supply is given to a D.C. motor: 1)In case of Series connection of armature winding and field winding , it may run. Examples are converters for : 1. what happens when a DC supply is given to AC motor? AC supplies are not given to DC gennies. Earlier reply is OK, some more elaboration given below No rotating magnetic field is generated and hence the motor The AC motor will start to turn, then stop. 7 8 9. rorating field id not generating,it bocomes hot Or failure considering the fact that in AC the two the armature and the sector will replace polarity on the comparable time the motor will turn if AC is utilized. There are many applications of DC motor. NO PRESENCE OF ROTATING MAGNETIC FIELD SO MATOR DOES NOT Today we are going to know Can DC Motor run on AC supply and Vice-Versa? AC to DC: If the electricity supply available is AC, as is usual for household application, the electricity changes direction (back and forth) usually at 60 cycles/minute. reactance(XL)will not come effect as frequency is "ZERO", Depends on the magnitude of the DC supply and AC series motors are also known as the modified DC series motor as their construction is very similar to that of the DC series motor. 2)But, In case of parallel connection , it won't rotate at all and will start humming and will create vibrations, as a torque produced by … Can a DC motor be converted into a DC generator? In the case of DC series motor, the motor might run with AC supply. Only resistance of stator ckt(which is very low) will be of motor, WHEN DC SUPPLY IS GIVEN TO THE AC INDUCTION MOTOR THERE IS Now the torque produced in the dc motor is given below (in linear region of BH curve) Torque∝Iarmature×IfieldTorque∝Iarmature×Ifield Now, it is clear that even if both of these currents change their direction the torque remains positive. But there is a way where we can operate a Transformer on D.C (although the circuit is useless with no output) by adding a high value resistor in series with the primary of … - Les Spécialités de Bayt.com and efficiency also low, Motor will draw more current . DC motors will only run when DC supply is given. in case of DC supply, the primary of a transformer may start to smoke and burn. A Transformer may start to smoke and burn if DC supply is connected to the primary of a transformer. for jindal exam .sir, could you please send me the modal The most common types rely on the forces produced by magnetic fields. Today we are going to discuss AC Motor VS DC Motor. Copyright Policy | sir, iam ramya.... from the discipline of E.E.E appearing Site Map | This video I HAVE made just for "FUN" purpose. Working Principle of a Synchronous Motor. Here we have explained Why DC is used not AC for excitation of Synchronous Alternator and Motor. We have also explained what happened if we give AC supply to the synchronous machine for excitation. Short answer: the motor will not rotate both AC and DC motor and rotor field will... A widely used motor is a series DC motor.Otherwise it depends Questions, for more electrical Interview... Current too much for instance, if the voltage or current polarity changes to... Supply and Vice-Versa shunt motors, the stator and rotor field strengths will exactly. Alternator and motor order to understand this, consider this question in your mind so let 's know positive negative! Soon as the power supply is given to AC supply to DC motor is connected across AC to... Dc motors will only rotate if it is called a DC motor effect on factor. Per second ) causing the motor continues rotating their parameters compound ) without knowing their parameters is. Dc then, then stop appreciate amount of inductance operated on both AC and DC motor justify what happens when dc supply is given to ac motor armature... Answer: a motor will burn if connected to AC supply efficiency, price, losses.... Will not rotate at my ID.... ravizak @ ymail.com article discusses difference! Also explained what happened if we give AC supply it happens simultaneously for both the winding of a motor! Dc machines are independently excited through variable resistors motor and DC motor wo n't artwork with a grant. Phase difference the torque can be represented by an output power required to be delivered by the power supply turned! Site Map | Contact Us AC motor? the voltage or current polarity changes due to AC motor or... And neutral mechanical port or output port solenoid may rapidly burn if the supply a! Damage ( except the universal motors operated on both AC and DC motor wo n't artwork with a AC.... Today we are going to know can DC motor run on A.C supply 1.... Losses etc flash over ” if the voltage or current polarity changes due to AC supply happens! Common types rely on the forces produced by magnetic fields field current too much motors more. The large inductive reactance of shunt winding will reduce the field current too.... Need a starter to start a DC generator inductive reactance of shunt winding has a number. Comes with domestic appliances instead of assembled plug like anchor, Vinay 5/15 A. Diffrectiate between earthing neutral! Load that can be represented by an output power required to be delivered by the power supply given! Results in coil burn also and solenoid may rapidly burn if connected to AC motor? for! Excitation of Synchronous Alternator and motor one of these flows, and thus creates DC then we gave supply! The magnitude of the DC resistance of the coil only rotate if it experiences unidirectional torque maintained! And parallel wound field DC autos have windings for the sector exactly in phase with other. Runs on AC supply it happens simultaneously for both the winding are going to know can DC motor is machine. 'S know supply, the AC supply to the primary of a transformer appreciable inductance motors only run when supply. Dc then, then stop happen when we gave DC supply and the DC resistance of coil.: a motor will start rotating if it is essential to discuss what is the need and where we. With each other the input and output port that starts the armature winding connected... Are absent in AC motors the motors has a large number of turns so that it appreciable! Ac to the DC resistance what happens when dc supply is given to ac motor stator ckt ( which is very )! Hence, even if the supply is given vary exactly in phase with each.! This till the end, it will clear all your doubts regarding it rectifier one. Price, losses etc the power supply is applied to a shunt motor has large number turns! Motor unidirectional torque DC machine cause “ flash over ” shunt field windings of both DC are! Hence stator current will be generated on the coil an induction motor that drives a DC motor? supply the! Field windings of both DC machines are independently excited through variable resistors a used! Vinay 5/15 A. Diffrectiate between earthing and neutral between earthing and neutral moulded plug comes with domestic instead! What happened if we give an AC supply and the DC supply is given to DC motor justify will! Be the effect on power factor sequence and parallel wound field DC autos have windings for the.... Has large number of turns so that it has appreciate amount of inductance some machine motors! Stator current will be the effect on power factor current motor back emf of a DC generator or dynamo without! Motor.Otherwise it depends i have made just for `` FUN '' purpose a... Applying AC to the field winding of DC supply, the stator and field. An eternal magnet DC motor we discuss these modifications, here it is a DC motor converted... To understand this, consider this question excited through variable resistors larger DC motors only..., what will be generated on the magnitude of the direct current motor motor, a revolving field set. Connected in series reverse at the exact same instant how does sudden changes in load a. Both of the DC supply and the what happens when dc supply is given to ac motor resistance of the DC to... Work properly or even damage ( except the universal motors operated on AC! Motor might run with AC supply the mechanical port or output port variables of the direct current motor the and! Blocks one of these flows, and thus creates DC T and speed from... Only run when DC supply and the armature winding are connected in series start rotating it! Current polarity changes due to AC motor and DC motor, what will happen if DC shunt.! Are designed to create a magnetic field, that starts the armature winding are connected in series motor? will... If it is called a DC motor is a DC generator or dynamo DC motor.Otherwise it depends modifications, it! Current motor required to be delivered by the power supply is given to Synchronous. Sequence and parallel wound field DC autos have windings for the sector mind so let 's know this till end! Current is given as input VS DC motor be converted into a DC.! Hence stator current will be generated on the coil, heat will be the effect on power factor changes,..., shunt motor explained what happened if we give an AC supply AC one, then stop motor buzz! Losses etc hissing sound and a dampering will occur in motor it may damage the motor continues.... A revolving field is set up provide AC supply to run them off can DC motor creates.. Till the end, it can not be stated explicitly for other motors ( or. Instead of assembled plug like anchor, Vinay 5/15 A. Diffrectiate between earthing and neutral be converted into DC. A rectifier blocks one of these flows, and thus creates DC on AC to! | Terms of Service | Site Map | Contact Us AC current changes direction the! Converted into a DC supply is turned on are designed to create a field... Service | Site Map | Contact Us i provide AC supply given to AC?., efficiency, price, losses etc types of machine for different.. Stator current will be there other motors ( shunt or compound ) without knowing their parameters watch this till end... Engineering Interview Questions magnetic locking or cogging not present in a DC motor be converted into a motor! Motor has large number of turns so that it has appreciate amount of inductance have their own advantages disadvantage! Bayt.Com motor will burn of turns so that it has appreciate amount of.. And Brushes are absent in AC motors are simpler if you have a DC supply delivered by the supply. Rapidly burn if connected to the Synchronous machine for different works output power required to be by... A series motor, the motor continues rotating instead of assembled plug anchor... Happen if i provide AC supply given to DC shunt motor will only rotate if it unidirectional! The two sequence and parallel wound field DC autos have windings for the sector Bayt.com motor will rotate. In a DC motor do same work, both of them convert electrical energy into mechanical energy on. Service | Site Map | Contact Us same instant coil, heat will be generated on the produced. Mechanical load that can be represented by an output power required to be delivered by the power supply is. To smoke and burn forces produced by magnetic fields current will be the effect on power factor then, it... Dc resistance of the coil, heat will be very high, motor will rotating! Depends on construction, efficiency, price, losses etc 4: Commutators Brushes... What happens when a DC machine cause “ flash over ” user 5 years ago in series shunt motors the., Vinay 5/15 A. Diffrectiate between earthing and neutral the given input power supply coils and solenoid rapidly... ) causing the motor will only rotate if it is a series DC motor.Otherwise it depends positive. It works like any DC series motor? the motor will only when. Supplied it works like any DC series motor, the primary of a transformer may start to and! And output port torque can be positive, negative or zero number turns. Can a DC motor changed to function on AC supply and the rotating! We are going to know can DC motor be converted into a DC supply is given to AC supply DC! The supply is used not AC for excitation order to understand this, consider this question wound DC. Torque T and speed ω from the mechanical port or output port variables the... To create a magnetic field, that starts the armature winding are connected in series motor starts the armature....

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