because of high resistance in the load.
1 HP is 746 watts in principle. The power is in watts, and the power is the volts times the amps. For an AC motor the power is the volts times the amps times the power factor times a factor that depends on the power-conversion efficiency of the motor.
Per factor is 1 when reactive power is zero.
Ac motor has a low starting torque so that DC series motor used in railways cause DC motor has high starting torque
The big difference is that the synchronous motor's rotor can have a variable current applied to it through its field slip rings. Both types of motors have their own advantages. With a synchronous motor in the system, the systems power factor can be regulated.
power factor=real power/apparent power... real power in the sense the capacity of the circuit for performing a work in a particular time..for example the work done by a motor circuit is so and so...real power is what we consume from them... apparent power if the product of the current thro' the circuit and the voltage...it will be always greater than the real power.. if the POWER FACTOR IS 1.0(100%),THEN THE AC POWER IN THE CIRCUIT WILL BE EQUIVALENT TO THE POWER OFFERED BY A DC CIRCUIT....
How do you calculate 3ph AC motor power?
1 HP is 746 watts in principle. The power is in watts, and the power is the volts times the amps. For an AC motor the power is the volts times the amps times the power factor times a factor that depends on the power-conversion efficiency of the motor.
Power factor is an AC only term, and has no meaning for DC.
To convert ac electric power into mechanical power.
Not usually. But this depends on how the motor is made. So a permanent magnet motor is usually a d.c. Motor. It's something to do as with the wires in the motor, the electromagnet-outer fields are wound.
With a DC motor, power is supplied from a controller and transmitted to the motor windings via brushes and a commutator using pulse width modulation. This requires that the controller be adequate to handle the power/heat of the application and that the brushes and commutator are well maintained as they are wearing parts. With an AC servomotor, the controller only provides a low power signal to any size motor. Raw power to the motor is handled separately from the control circuit. The control signal is used to control the position of the motor which has internal position sensing capability. Power to the AC servo is always on.
Low pressure port should be on the firewall by the fan motor What fan motor?
Per factor is 1 when reactive power is zero.
Power Factor is a maximum of one when the voltage and current in an AC waveform are in phase. Since power in watts is equal to voltage x current x power factor, you get maximum wattage with power factor = 1. This occurs with a pure resistive load. When you power an inductive load like a motor the power factor decreases and so does the delivered power. That is why motors are typically rated in VA, or volt-amperes rather than watts. So y Ou can assume power factor = 1 when you have a load measured in watts like a light bulb or space heater and perhaps in the .75 range for an inefficient motor.
AC-1This applies to all AC devices (Resistive loads) with a power factor of at least power factor of 0.95 AC-3This applies to AC Inductive loads. Like squirrel cage motors.
Ac motor has a low starting torque so that DC series motor used in railways cause DC motor has high starting torque
The formula you are looking for is Watts = Amps x Volts. However, since the electricity is (probably) AC (wall power), you need to add an additional factor called "power-factor" because "AC" power doesn't work exactly like DC (battery) power. So the formula becomes Watts = Amps x Volts x "power-factor" - where the power factor is a decimal fraction somewhere between zero and one. Note that power factor is never larger than 1.0. Since the true power (multiplied by the power-factor) is always less than the "apparent power" (volts time amps without power-factor) you can use apparent power (also called "VA" - "Volt-Amperes" as a rough approximation. Unfortunately - in the case of a motor, the power-factor is not constant. It varies rather widely based on both speed and load, so if you need to know the EXACT power, you need a direct-reading AC watt-meter. If you want a closer approximation to "true power" - and you don't know the exact power factor - you can approximate it by multiplying "apparent power" by 0.71.