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What is the horsepower of a motor drawing 75 amps on 480 volt three phase power?
Wiki User
∙ 10y ago
Probably 2-3 HP.
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The electrical code book states for estimating values only that a 1.5 HP motor operating on three phase 208 volts draws 6.6 amps. For calculating overload protection and conductor size, the motors nameplate rating should always be used.
Wiki User
∙ 9y ago
Wiki User
∙ 10y agoOn 480 v 3-phase the line-to-neutral voltage is 480/sqrt(3) or 277 v, and at 75 amps each phase supplies 277 x 75 amps or 20775 VA (volt-amps) and the three phases together supply 62325 VA.
Assuming a power-factor of 0.8 the motor draws a power of 49860 W and its efficiency can be assumed to be 90%. Its mechanical outout would then be 44874 W. One horse-power is 746 watts so the mechanical output is estimated at 60 HP.
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The equation for finding HP is HP = I x E x 1.73 x %Eff x PF/746.
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.
So HP = 75 x 480 = 36000 x 1.73 = 62280 x .87 = 54184 x .98 = 48765/746 = 65 HP.
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What is the difference between a Mercury 90 horsepower motor and a Mercury 115 horsepower motor?
25 horse power.
How is a three phase agricultural motor used when there is no power supply?
With no three phase power supply you can't use a three phase motor of any kind at all!
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.
What is the weight of a single phase motor vs a three phase motor having same power?
They will not be very different.
Where would power factor capacitors be installed on a 3 phase motor?
Power factor capacitors can be installed on a three phase motor between the motor contactor and the overload heater block.
What would be the horse power required in a 3-phase motor to replace a .5 horsepower single phase motor.?
You still need the same horsepower. The advantage of the three-phase motor is that it will draw lower current.
What is the actual power of a 5 horsepower motor?
A 5 horsepower motor would have 3,730 watts of power.
What is B.H.P in 3 phase induction motor?
BHP stands for 'brake horsepower', and simply means it is describing the output, rather than the input, power of the machine. Although a motor's output power is expressed in horsepower in North America, elsewhere it is expressed in watts.
Minimum breaker size 60 horsepower motor?
Need motor voltage, amperage and phase to give you an anwer.
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.
What is the difference between a Mercury 90 horsepower motor and a Mercury 115 horsepower motor?
25 horse power.
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.
What is a five-horsepower induction motor?
It's an a.c. motor with an output power of 5 horsepower or roughly 3.75 kW.
How is a three phase agricultural motor used when there is no power supply?
With no three phase power supply you can't use a three phase motor of any kind at all!
How do you use a one phase motor in place of a three phase motor?
To use a single/one phase motor instead of a three phase motor is possible if you have a three phase power supply as you will only need to tap one of the three phases together with neutral and an earthwire, however to use a three phase motor instead of a single phase will require the provision of three phase power supply.
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 start a three phase motor to a single phase power supply?
You don't. A three phase motor will not start unless it is connected to a three phase supply.
