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There is two motors, both motors having same hp, rpm, frequency but the rpm is different. For example one motor is 5hp, 3phase, 50hz, 1440 rpm. Second motor is 5hp,3phase,50hz,3000rpm. What is the current for both motors.
The calculation of current does not depend on the rpm you just need hp and voltage. A simple formula is 1 hp = 746 watts, and current = watts divided by voltage.
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∙ 11y ago
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∙ 10y agoEfficiency is the machine's output power, divided by its input power. Both must be expressed in the same units of measurement, normally the watt. The output power can be calculated from the torque it produces, using a device such as a Prony brake or a dynamometer. The input power can be calculated using a wattmeter.
Efficiency can be expressed either as a 'per unit' value (e.g. 0.85) or as a 'percentage' (e.g. 85%).
Wiki User
∙ 9y agoIt depends on the type of motor, its size and whether it's AC or DC.
For a DC motor it depends on the armature resistance, and the field winding resistance for a series motor. A resistor may be added to limit the starting current. For AC it depends mainly on the inductance of the field winding.
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∙ 14y agoelectrical cost is measured in watthours . generally there will be some fixed cost for one kilowatthour and we hav to pay according to it .
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∙ 14y agoHow_do_you_calculate_starting_current_for_motorsho
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∙ 11y agoNeed more data about the motor, HP, voltage.
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∙ 12y agogila
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How do you calculate voltage drop for starting motor current and how to get the starting pf?
How do you calculate voltage drop for starting motor current
Why a dc series motor should never run at no load condition?
if you run the unloaded motor at max rpm the centrifugal forces will cause the motor to be totally destroyed so it is advisable to not to run it at max rpm it should be okay to run it till 50% of max rpm without loading it
What operating condition is most likely to overheat a motor?
When dc motor run full torque at low speed. Armature current is high and field current is set to max to get the torque. When motor is field weaken then temperature decrease at same cooling air flow
What is the formula to calculate the overload setting for a star delta starter?
Full load current ofthe motor x 0.58
How do you convert hp to amp?
HP/.00134= Watts Then Watts divided by Volts = AMPS For expample. a .75 HP electric motor running on 220VAC uses 2.544 amps .75 / .00134 = 559.7015 Watts then 559.7015 / 220 = 2.544
How do you calculate voltage drop for starting motor current and how to get the starting pf?
How do you calculate voltage drop for starting motor current
How do you calculate maximum earth fault current?
transformer max earth fault current
Why a dc series motor should never run at no load condition?
if you run the unloaded motor at max rpm the centrifugal forces will cause the motor to be totally destroyed so it is advisable to not to run it at max rpm it should be okay to run it till 50% of max rpm without loading it
How do you calculate hydraulic motor?
how to calculate hydraulic motor torque
What operating condition is most likely to overheat a motor?
When dc motor run full torque at low speed. Armature current is high and field current is set to max to get the torque. When motor is field weaken then temperature decrease at same cooling air flow
What is the formula to calculate the overload setting for a star delta starter?
Full load current ofthe motor x 0.58
How do you calculate crane motor ED?
How to calculate motor kw for cranes
How do you calculate hydraulic motor torque?
how to calculate hydraulic motor torque
Which calble use single 1 hp motor?
Motors with same horse-powers have different full load amps when operating. To calculate the size of wire to supply the motor feeder the voltage or current of the motor has to be known.
How do you calculate 3ph AC motor power?
How do you calculate 3ph AC motor power?
How do you convert hp to amp?
HP/.00134= Watts Then Watts divided by Volts = AMPS For expample. a .75 HP electric motor running on 220VAC uses 2.544 amps .75 / .00134 = 559.7015 Watts then 559.7015 / 220 = 2.544
How do you calculate motor wattage from its resistance?
All you can do is get in the ballpark knowing resistance of windings and the supply voltage. Current = Voltage divided by resistance. Wattage = voltage x current x power factor. For a motor the power factor is between zero and sone number less than one, with one being just a resistive load. So if you calculate the current and use a PF = 1 you can get worse case wattage.
