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Presumably you mean 'rated full-load current'? The thing to remember is that motors, whether rated in horsepower (North America) or watts (practically everywhere else), are rated according to their output power. Because motors are not 100% efficient, the input power is always somewhat higherthan the output power. 0.5 horsepower is equivalent to about 373 W output power. If we assume that the motor runs at, say, 90% efficiency at its rated output, this means its input power will be around 414 W. To determine its input current you must then divide its input power by the rated supply voltage.
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What is the formula to convert 440 to 220 single phase while in motor rewinding?
If it was 440 v single-phase, use half the number of turns in the windings, but use thicker wire of double the cross-section. Or to use the same wire again, fold the wire once into half its length and use that.
Why a single phase induction motor is not self starting?
Single phase induction motor is not self starting because, when the main winding is excited from a single phase supply, it produces an alternating magnetic field instead of rotating magnetic field in two phase and 3 phase induction motor. According to double field revolving theory any alternating vector can be resolved into two vectors rotating in opposite directions, each having magnitude equal to one half the magnitude of the actual vector. The vectors will be rotating in such a way that their resultant will be zero at every instant. Thus a single phase induction motor fails to produce a net starting torque, and is not self starting.It can be made self starting by any of the methods below1) By using an aux winding in series with a very high resistance2) using two capacitors,in series with the aux wdg,one with intermittent duty and the other one with continuous duty3) Using shaded poles
How both positive and negative half cycles of a ac voltage distributed through a single phase. can anybody please explain?
Single-phase ac has current that changes direction 100 times a second (if it's a 50 Hz supply). It only needs two wires to distribute a single-phase supply. Imagine it as a battery that is continually being reversed.
230V line to line a single phase?
Yes. 230V line to line is considered single phase power. The 115v half part of that is called split phase. It should not be called two phase, as it is one phase that has been center tapped and grounded at the neutral point - it is still one phase power.Answer230 V is the standard nominal voltage for residences in Europe. 230 V is the line-to-neutral voltage (phase voltage). Low-voltage distribution is by three-phase, four-wire, system with a nominal line voltage of 400 V and a nominal phase voltage of 230 V.
What is the frequency of ripple components in the output of capacitor filter?
It depends on whether or not it is a half wave or full wave rectifier. For a single phase 60 Hz rectifier, a half wave rectifier will be 60 Hz while a full wave rectifier will be 120 Hz. A three phase full wave rectifier will be 360 Hz.
What single phase motor should you use to get out the same power as a 3 phase one and a half HP motor It's going on a lathe and I don't want to find that a singel phase one and a half motor labors?
One And a Half Horse Power Obviously.
How many amps does a half horse power motor draw at 220 Volts?
to calculate: 1hp=745W 3hp=745*3=2.2Kw assuming a 3 phase motor power is V*I*pf*the square root of 3 I would gues a PF of 0.8 if its a resonable motor which gives about 7.2 amps per phase. if the PF is bad say .65 it could pull up to 9 amps in short, too little information to give you the actual answer.
What is the advantage of using two phase in single phase motor?
Two phase motors are a thing of the past and are not used today if any still exist. Two phase legs are classified as a single phase system. If the question refers to a dual voltage motor then the answer depends upon what supply voltages are available to operate the motor. Operating a motor at the higher of the two voltages means that smaller control equipment and wire feeders can be used to operate the motor. If the nameplate is checked, in the amperage box there will be two current ratings, Amps/Amps. One will be half of the other one. Look at the supply voltage box and you will see the corresponding Voltage/Voltage. The first number in the voltage box corresponds to the first number in the amperage box. The higher the voltage the less line loss will occur over a distance. If possible always try and use the highest voltage to operate motors.
What is the formula to convert 440 to 220 single phase while in motor rewinding?
If it was 440 v single-phase, use half the number of turns in the windings, but use thicker wire of double the cross-section. Or to use the same wire again, fold the wire once into half its length and use that.
How many amps draw is there on a half hp 3 phase electric motor?
5 hp equals 3730 watts, and on a 3 phase 480 v system the line voltage is 277, so the current times 277 times 3 equals 3730. The answer in theory is 4.5 amps. But you have to allow for 10% power-loss in the motor, and also the power factor, which could be 0.8. Therefore the current is probably 6 to 6½ amps. Maybe 10 amps on starting up. <<>> The formula you are looking for when amperage is desired when horsepower is shown is - I = HP x 746 / 1.73 x volts x % efficiency x power factor. A standard motor's efficiency between 5 to 100 HP is .84 to .91. A standard motor's power factor between 10 to 100 HP is .86 to .92. Amps = 5 x 746 = 3730/1.73 x 480 = 3730/830 x .84 x .84 = 3730/586 = 6.37 amps. Starting current will be 300% of the motors run current.
Is a pool pump motor drawing half the amps listed on its nameplate a problem with the windings?
A pool pump motor which is drawing half the amps listed on its nameplate can indicate a problem with the windings or a lack of incoming current. Pumps will only draw as many amps as are required to operate under the current load.
Why a single phase induction motor is not self starting?
Single phase induction motor is not self starting because, when the main winding is excited from a single phase supply, it produces an alternating magnetic field instead of rotating magnetic field in two phase and 3 phase induction motor. According to double field revolving theory any alternating vector can be resolved into two vectors rotating in opposite directions, each having magnitude equal to one half the magnitude of the actual vector. The vectors will be rotating in such a way that their resultant will be zero at every instant. Thus a single phase induction motor fails to produce a net starting torque, and is not self starting.It can be made self starting by any of the methods below1) By using an aux winding in series with a very high resistance2) using two capacitors,in series with the aux wdg,one with intermittent duty and the other one with continuous duty3) Using shaded poles
How much does a basic home freezer pull in amps?
10 to 12 amps at 110 volts, as a surge when the motor first starts up, then about half that during the rest of the cycle.
Is there a rule of thumb to get motor Florida for a 380V 50Hz motor?
Depending on the type (three phase, single phase), there are generic power factor and efficiency values you can estimate if you haven't chosen a specific motor, but need to size wiring ahead of time. You'll need to double check after the motor is specified, though. Cart before the horse. You can find these values by simply comparing a half dozen motors similar to what you're thinking (compare phase, horsepower/kw rating, duty factor, etc.).
What happens if you under power an electric motor you have a 3 hp single phase motor that requires 39A but your generator only outputs 23.2A?
If you make the connection, the breaker on the generator will trip. The motor will not get up to running RPM. Check and see if the motor is dual voltage. If it is, run it on the higher voltage. This will reduce your run current to about half of what it is on the lower voltage.
What happens when you share 2 20 amp breakers with 1 neutral wire?
if it is (1) a-phase and (1) b-phase then this is the common and preferred wiring method (balanced). if you have two circuits of the same phase sharing the neutral then it is wired wrong (imbalanced). gfci and afci breakers need there own neutrals too. as far as what happens two examples: A: (balanced system) a-phase carrying 10 amps, b-phase carrying 10 amps, neutral carries 0 amps. B: (imbalanced system) a-phase carrying 10 amps, a-phase carrying 10 amps. neutral carries 20 amps. hope this helps. good luck This is not strictly true. Most residential power is supplied in a single-phase 120/240 volt format and has nothing to do with multiple phases. A single phase transformer secondary winding is center-tapped to provide two segments, each of which is 120 volts to the center tap point, which is grounded. There are then 240 volts between the outside ends of the full secondary winding. If both breakers are fed from the same ungrounded end of the winding, all of the current would pass through only one half of the secondary winding, and hence, through the neutral as well. If two breakers were installed such that they were fed from remote ungrounded ends of the secondary winding, then the only current through the grounded center-tap neutral would be the imbalanced current of the two circuits.
What are the disadvantages of half wave recrifier?
A half wave rectifier does not make a stable voltage. A single phase half wave creates a "bumpy road" where voltage modulates between sine wave maximum and zero. A three phase half wave will create a more stable, but ultimately "unclean", voltage.
