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What will happen if dc supply given to a single phase ac motor?

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2008-08-11 07:54:44
2008-08-11 07:54:44

The supply will likely short out and fail.

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That happens when the supply is turned off, and the motor runs down and stops.

It will drawn a large amount of current which can destroy the shunt

To answer this question, the voltage whether the supply is single or three phase, of the 1.5 HP motor must be given.

Most likely is going to explode. Put 120 psi on a car tire rated for 35psi and you will have the same effect.AnswerThe circuit's protective device will disconnect the motor from the supply, It will not explode!

All types of motor can be run from a single-phase supply provided the frequency, voltage and power capacity of the supply matches that of the motor and it has been designed to run on single-phase.

Then the motor will act as generator by principle

No. That would be a single phase motor.

If you interchange any two of the supply legs of a three phase motor, the motor will operate in a reversed rotation than is did before the interchanging of the supply legs.

A static converter allows a single phase supply to operate a three phase motor. Basically it converts the single phase supply into enough energy to power the three phase motor.

the working principle of single phase induction motor is similar to the three phase induction motor, when we supply is given to the single phase induction motor a revolving field set up in the stator which produces a torqe air gap between north pole and south pole and rotor picks up speed

The single phase motor when powered on when the neutral wire is not connected is that the motor will not start.

A three phase motor requires a three phase power supply. You can not run a three phase motor on a single phase power supply unless you provide some kind of converter, such as a motor-generator set or an inverter. You might be able to get the motor to rotate on single phase, if you provide starting torque somehow, but you will not get rated power in that configuration.

You don't. A three phase motor will not start unless it is connected to a three phase supply.

AC and DC supply sources we are given to motor so we are called double excited motor

Shunt motors do operate on single phase AC. There are millions, if not billions of them worldwide running right now.Make certain your voltage supply is correct for your motor. Also, make certain you're providing the proper amperage. Make sure it's not a three phase motor. (three phase motors won't operate on single phase power.) If your supply voltage and amp supply is correct and the motor still doesn't run, you've got a bad motor.

The difference between a single phase and a three phase motor is the amount of power conductors that feed the device. As to the other part of the question a three phase motor will not start or run on single phase. The phase angles on three phase are 120 degrees apart on a single phase system they are 180 degrees apart.

suitable winding and correct power supply

You will need to install a phase converter or change the motor to single phase. You can find a licensed electrician at www.contraxtor.com

I'm not sure how you would even accomplish this. On a single phase motor you will have the wire for connecting power to the motor, and a return neutral (along with several other wires for other things). If you connect two phases together you create a short and you'll blow the upstream fuse/breaker.

You would use a single-phase induction motor if the available electric power supply is a single-phase one. That applies to the average house or small business.

If the motor is designed for 120V or 220V whatever the case, it will function properly.If it is a 12V motor and you supply 120V it will make a mess and you will probably get hurt from flying debris!

I assume that by two-phase, you really are talking about a supply with two hot wires and a neutral, such as 120/240 volt. This is single phase power, it just has power taps on both ends of the transformer winding, the neutral is the center tap. I don't think it is possible to convert or rewire your motor. A large 3 phase motor must be run on a 3 phase electrical supply. It will not run and will overheat if you try to connect it to a single phase supply. The only way to make a 3 phase supply from a single phase supply is to use a converter like a motor-generator set. That would be way more expensive than getting a new motor.

With the mention of 415 supply voltage it suggests that the supply frequency is 50 hertz. Without knowing what the frequency of the 230 volt three phase motor is, a solution to the problem can not be given.


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