0
For single phase the formula is HP = I x E x %eff. x pf/746.
For three phase the formula is HP = I x E x 1.73 x %eff. x pf/746.
Where I = amps, E = volts, %eff. = efficiency of the motor and pf is the power factor of the motor.
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoamperage times voltage. Also figure 1-1/2 times running amps for starting amps. This formula will give you watts or power.
AnswerPower factor is, by definition, the cosine of the phase angle -i.e. the cosine of the angle by which the load current lags or leads the supply voltage. Power factor can also be expressed as the ratio of true power (in watts) divided by apparent power (in volt amperes).
As motors represent inductive loads, their power factor will be lagging.
A motor's power factor may change as the machine's load varies. However, for a constant load, to determine the machine's power factor, you need to use a wattmeter, an ammeter, and a voltmeter. The product of the ammeter and voltmeter readings will give you the apparent power, expressed in volt amperes. The wattmeter reading will give you the true power, expressed in watts. To determine the power factor, divide the true power by the apparent power.
Wiki User
∙ 11y agopf=power/VI;
where; pf-power factor
V-Ac voltage
I-Ac current
Note: This formula applies only for single phase motors, for three phase you add underroot 3 to VI
Wiki User
∙ 11y agoanmol pandher
Add your answer:
Earn +20 pts
Is your power into motor equal to your power out of motor at no load?
For a motor's output power to equal its input power, the motor's efficiency must be 100%. As no machine, particularly a rotating machine, can possibly achieve 100% efficiency, there is no condition under which its output power can ever match its input power.
Does motor rating mean the electrical power required into a motor or the electrical power of the motor's output?
Normally you would specify a motor to do a particular job by the mechanical power output you require.A motor takes electrical power "in" and produces mechanical power "out".Read whatever it says on the motor's rating plate or user-guide.The mechanical energy output of a motor is measured in various units around the world: for example in watts, horsepower (or brake horsepower).Another answerThe above answer is quite correct in stating that a motor's output power is its rated power as it's a guide to how much load it can drive.Power is simply a rate - the rate of transfer of energy. The horsepower is the Imperial unit of power, whereas the watt is the SI unit of power. In the US the output power of a motor is typically still measured in horsepower whereas in Europe the use of horsepower is almost obsolete, except for small "fractional horsepower" electric motors, and both the input power and the output power of a motor are measured in watts or, more likely, kilowatts.
How do you calculate the load percentage of a three phase UPS?
output power/Rated power
Can you wire a 2 speed motor on an invertor?
Yes,provided that the power output of the investor is higher than the motor's rated power.
Can transformers be connected in series?
A: Absolutely but the output for a power transformer will be less. the phases can also be out of phase on the output yielding no output at all.
How do you calculate the torque at the output at the gearbox output shaft?
how calculate power gearbox output
How do you calculate 3ph AC motor power?
How do you calculate 3ph AC motor power?
Is your power into motor equal to your power out of motor at no load?
For a motor's output power to equal its input power, the motor's efficiency must be 100%. As no machine, particularly a rotating machine, can possibly achieve 100% efficiency, there is no condition under which its output power can ever match its input power.
How do you calculate DC power output?
touch uranus
How many amps is 2 hp at 230V 3 phase?
6,25AnswerWithout knowing the efficiency of the motor, it's impossible to tell. The horsepower rating of a motor describes its output power; you need to know its input power in order to calculate its current.
Does motor rating mean the electrical power required into a motor or the electrical power of the motor's output?
Normally you would specify a motor to do a particular job by the mechanical power output you require.A motor takes electrical power "in" and produces mechanical power "out".Read whatever it says on the motor's rating plate or user-guide.The mechanical energy output of a motor is measured in various units around the world: for example in watts, horsepower (or brake horsepower).Another answerThe above answer is quite correct in stating that a motor's output power is its rated power as it's a guide to how much load it can drive.Power is simply a rate - the rate of transfer of energy. The horsepower is the Imperial unit of power, whereas the watt is the SI unit of power. In the US the output power of a motor is typically still measured in horsepower whereas in Europe the use of horsepower is almost obsolete, except for small "fractional horsepower" electric motors, and both the input power and the output power of a motor are measured in watts or, more likely, kilowatts.
How will the armature current and the output power of a dc shunt motors change with increasing load?
With increasing torque load the armature tends to slow down; the motor draws more current to compensate, and if there is armature resistance the back emf generated by the armature falls to allow the increased current to flow, which causes the motor to settle at a lower speed. The mechanical output power is the speed times the torque, and increasing the torque increases the power output provided the speed does not drop much.
What is horse power of a 415 volt 3 phase 7.5 kW electric motor?
Motors are rated according to their output power, never their input power. This is because it is the output power that determines the load the motor will be able to handle. The output power, of course, is lower than the input power due to the machine's losses.In North America, the output power is generally expressed in horsepower, whereas its input power is measured in watts. In the rest of the world, the horsepower is considered obsolete, so both the output power and the input power are measured in watts.As there are 746 W to the horsepower, your 75 kW output motor would be equivalent to approximately 100 horsepower.
How much work can a motor with a power output of 25W do in one second?
A power output of 25W for one second is 25 joules. It is also 0.03 horsepower (electric motor scale)
How do you calculate the load percentage of a three phase UPS?
output power/Rated power
Can you wire a 2 speed motor on an invertor?
Yes,provided that the power output of the investor is higher than the motor's rated power.
How will the output power of the motor change in comparison with the load?
dun know
