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Why does 3 phase motor have more torque than a single phase motor?
Wiki User
∙ 13y ago
A simple way to look at it is to assume you were spinning a wheel by hand and you were spinning it harder once per revolution. If you applied a load of some sort to the wheel it would slow over a period of time depending on the load. If you continued to manually try and keep the wheel spinning at the same rate, one revolution at a time this would effectively be adding torque to the wheel once per revolution. If you manually mimiced a 3-phase motor you would be manually spinning the wheel 3 times each revolution. This would basically apply three times the torque if each spin used the same force as the single spin did.
Wiki User
∙ 13y ago
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How does the 3-phase induction motor acts like 2-phase induction motor if a phase is disconnected from supply?
yes the motor will run but will draw more current and the torque will be not constant means not smooth due to unbalanced current
What motor gets more heated single phase or three phase?
Your question is a little like asking, 'How long is a piece of string?'! Do the two motors have the same power rating, or are they different?The rate at which energy is used by any machine is defined by its power rating. If the power ratings of two different machines are the same, then both machines use energy at the same rate. So if a single-phase motor has the same power rating as a three-phase motor, then they will both use exactly the same amount of energy over a given period of time.So, if a single-phase motor has a greater power rating than a three-phase motor, then the single-phase motor will the greater amount of energy in a given period. On the other hand, if a three-phase motor has a greater power rating than a single-phase motor, then the three-phase motor will the greater amount of energy in a given period.
What size motor do you need to run a compressor 2 stage 80 gallon tank i have a 3 phase on it and want to change motor?
You probably need a 5hp or 7hp motor. Look for HP rating o the 3 phase motor and select the same for single phase. 3 phase has same power but is more efficient at electricity use. Also consider a 3 phase converter. It allows a 3 phase motor to run on single phase service.
Why three phase motor has the better performance when compare to single phase motor?
If you are asking what is the advantage of a motor wound for a Y or Delta configuration over a motor wound for a single phase configuration, then the advantage of the Y or Delta motor is more efficient operation. And in a motor, or in any power application, efficiency is all important.
Why is 3 phase more efficient?
There are a few reasons. In my opinion the most common is cost. In an industrial setting, three phase power is used to power motor loads. A three phase induction motor is more efficient than a single/split phase motor. They also have higher starting torque. A three phase load will also typically have a lower amp rating for the same size load as single phase. This saves money because you can use smaller wire.
How does the 3-phase induction motor acts like 2-phase induction motor if a phase is disconnected from supply?
yes the motor will run but will draw more current and the torque will be not constant means not smooth due to unbalanced current
What motor gets more heated single phase or three phase?
Your question is a little like asking, 'How long is a piece of string?'! Do the two motors have the same power rating, or are they different?The rate at which energy is used by any machine is defined by its power rating. If the power ratings of two different machines are the same, then both machines use energy at the same rate. So if a single-phase motor has the same power rating as a three-phase motor, then they will both use exactly the same amount of energy over a given period of time.So, if a single-phase motor has a greater power rating than a three-phase motor, then the single-phase motor will the greater amount of energy in a given period. On the other hand, if a three-phase motor has a greater power rating than a single-phase motor, then the three-phase motor will the greater amount of energy in a given period.
What s the role of capacitor in a single phase induction motor?
to start the motor and give more current to motor to run
How much more efficient is a 2 hp 240 v 3 phase motor compared to a 120 v single phase 2 hp motor?
I would guess it would use a third less than a single phase motor. The voltage differences don't save but 3 phase does. A 3 phase motor also starts easier.
Does a single phase motor heat up more than a three phase motor?
No, the motor manufacturer maintains a specific temperature range for motors to operate in. It is usually 40 degrees C. The frame design and cooling fan on the motor shaft keeps the motor operating at a temperature within the manufactures specifications. This is regardless of whether the motor is single phase or three phase.
What size motor do you need to run a compressor 2 stage 80 gallon tank i have a 3 phase on it and want to change motor?
You probably need a 5hp or 7hp motor. Look for HP rating o the 3 phase motor and select the same for single phase. 3 phase has same power but is more efficient at electricity use. Also consider a 3 phase converter. It allows a 3 phase motor to run on single phase service.
Why three phase motor has the better performance when compare to single phase motor?
If you are asking what is the advantage of a motor wound for a Y or Delta configuration over a motor wound for a single phase configuration, then the advantage of the Y or Delta motor is more efficient operation. And in a motor, or in any power application, efficiency is all important.
What generator is suitable for a 2 HP single phase motor?
Any single-phase a.c. generator producing more than 2.5 HP or 2 kW - at the required voltage.
Why is 3 phase more efficient?
There are a few reasons. In my opinion the most common is cost. In an industrial setting, three phase power is used to power motor loads. A three phase induction motor is more efficient than a single/split phase motor. They also have higher starting torque. A three phase load will also typically have a lower amp rating for the same size load as single phase. This saves money because you can use smaller wire.
Is it true that when a single phase motor that is being turned on and off repeatedly consumes more power?
Not always, but a motor often consumes more power as it is running up because the kinetic energy of the rotating parts has to be increased in this phase of operation.
What are advantages of three phase ac and a single phase ac?
In a typical 3 phase system you have multiple voltages and configurations that can be used in either single phase or 3 phase, depending on how the circuit is designed. A single phase system is just single phase. You can have multiple voltages but it is always single phase.For example, in a typical 277/480v 3 phase system you can power 277v single phase lighting or equipment, 480v single phase lighting or equipment (which uses 2 legs of the 3 phase system but operates like any other single phase circuit), or 480v 3 phase motors.When comparing motors, a 3 phase motor will be substantially smaller than a single phase motor of the same horsepower. You can also reverse a 3 phase motor by switching any 2 leads. A single phase AC motor runs in one direction regardless of how the leads are connected.AnswerFor a given load, a three-phase transmission system requires less volume of copper in terms of conductor size, compared to single phase, so it is more economical to use three-phase.
What are the advantages between 3 phase and 1 phase?
For a given load, a three-phase system uses less volume of copper (therefore is more economical) than a corresponding single-phase system, while supplying approximately-constant power. From the users' point of view, three-phase motors are self-starting and more compact than the equivalent single-phase motor.
