Great video! However It's important to clarify that the current calculation considers a single phase motor. You need to multiply the voltage by √3 for 3 phase motors. Single phase: A = 1000 ⋅ kVA / V Three phase: A = 1000 ⋅ kVA / (√3 × V)
Just a little correction on your triangle. Power factor is the cos(theta) of the angle (we call theta) you have labeled as 0.7. 0.7 (the power factor) is the result of that calculation, not the angle itself. Just a little clarification, since you can’t work out the equations otherwise. Thanks for the video!
Thanks for sharing. I wanted to draw attention to one thing. In your calculation you basically applied the power factor to the Power output by dividing the power output by the pf. While mathematically the end result will be the same, I think it is important to recognize that theoretically the pf is more like a ‘knockdown’ of the electrical input power rather. That means, strictly from the engineering point of view and dir the purposes of understanding, we ought to multiply the input power rather by pf rather than dividing the output by the pf.
is the Power factor given on the name plate ? Because it seems like you gave yourself .7 equals the power factor. But I didn't see where you solved for that.
7460w / 240v = 31amps .. vs your calculated 59.2amps Is this motor really wasting 28 amps ... That seems pretty extreme. So in this case, the electric company would be charging you nearly double the power that you're actually using. Is this common? Or is this example a particularly bad efficiency?
Thank you for the clarification. So if you measure each phase of this motor at fully loaded conditions the reading will be approximately 59.2 amps correct?
An induction motor has 40kVA input power, a power factor of 82 percent, and an efficiency of 92 percent. What is the horsepower? How do you solve this?
Thanks for your tutorial it is very helpful, if there is no info about the motor how can find efficiency, voltage source current resistance power voltage required Vin Vout, maximum and minimum voltage and so on. Can you help us please. Many thanks
Good morning, I have a VFD in which three phase induction motor is attached to and I have a capacitor bank to correct power factor lag. I want to know if it's a good idea to implement both power factor correction and a VFD?
As long as your project has the budget for it haha but usually with VFD's and its ability to soft start the motor it helps the motor not lose power which overall helps the power factor. So I would say if you need a VFD and still using capacitor banks then either the sizing of the motor, Tranformer, Cable or VFD is sized wrong or them some complexed loads which is go require a nice budget lol
Great video! However It's important to clarify that the current calculation considers a single phase motor. You need to multiply the voltage by √3 for 3 phase motors.
Single phase: A = 1000 ⋅ kVA / V
Three phase: A = 1000 ⋅ kVA / (√3 × V)
Just a little correction on your triangle. Power factor is the cos(theta) of the angle (we call theta) you have labeled as 0.7. 0.7 (the power factor) is the result of that calculation, not the angle itself. Just a little clarification, since you can’t work out the equations otherwise. Thanks for the video!
you are right. should be cos-1 70 in order to get the angle.
Thanks for sharing. I wanted to draw attention to one thing.
In your calculation you basically applied the power factor to the Power output by dividing the power output by the pf.
While mathematically the end result will be the same, I think it is important to recognize that theoretically the pf is more like a ‘knockdown’ of the electrical input power rather.
That means, strictly from the engineering point of view and dir the purposes of understanding, we ought to multiply the input power rather by pf rather than dividing the output by the pf.
is the Power factor given on the name plate ? Because it seems like you gave yourself .7 equals the power factor. But I didn't see where you solved for that.
This was a good video for a quick refresh :) Thanks!
7460w / 240v = 31amps .. vs your calculated 59.2amps
Is this motor really wasting 28 amps ... That seems pretty extreme. So in this case, the electric company would be charging you nearly double the power that you're actually using. Is this common? Or is this example a particularly bad efficiency?
Thank you for the clarification. So if you measure each phase of this motor at fully loaded conditions the reading will be approximately 59.2 amps correct?
thank you for the video.
Nice IKEA Chair, I have one at home. I am from the UAE
An induction motor has 40kVA input power, a power factor of 82 percent, and an efficiency of 92 percent. What is the horsepower?
How do you solve this?
H0w can I take this course? I'm currently at
SOROHT SHAW
Would like to know the PF for a VFD driven Induction Motor
Thanks for your tutorial it is very helpful, if there is no info about the motor how can find efficiency, voltage source current resistance power voltage required Vin Vout, maximum and minimum voltage and so on.
Can you help us please.
Many thanks
Thank you, now the calculation makes sense
Good morning, I have a VFD in which three phase induction motor is attached to and I have a capacitor bank to correct power factor lag. I want to know if it's a good idea to implement both power factor correction and a VFD?
As long as your project has the budget for it haha but usually with VFD's and its ability to soft start the motor it helps the motor not lose power which overall helps the power factor. So I would say if you need a VFD and still using capacitor banks then either the sizing of the motor, Tranformer, Cable or VFD is sized wrong or them some complexed loads which is go require a nice budget lol
Can’t you just look at the name plate and look for the FLA to get the current ?
Yup but when you’re in school they ask stuff like this.
But with all due respect, it was very helpful. Thank you.
Switching to facecam is no bueno
The coffee peace was so pointless lol
VA= V•I•√3
I really wish you would shorten your intro and get to the point. People are on UA-cam so that they can cut the crap and get the info they need.