holo

Members

21

1. Power balance error on Transient Magnetic

WOW thanks a lot!!! That explains everything. I needed to sum the 3 graphs of power, it makes sense now. I still can't believe I have 97% efficiency with this thing lol I'll double check it. Have a good day.
2. Power balance error on Transient Magnetic

Just to be sure, this is how I'm doing the power balance right now (the numbers are rounded): Torqueelectromag(mechanicalset rotor) = 27Nm average Mechanical_power= 27Nm*1500*2*PI()/60 =4200W ** PowerP(current source) over a period = 2100W rms value * 3 current sources =6300W = P_input Then I calculate the joule losses on the stranded coil conductors with a sensor. It gives a triphasic sine wave that goes from 0 to 9W . The sum of the 3 waves is about 13W constant. The same but for the resistors that I put into the circuit: sine wave with 30W peak. the sum of 3 waves is 45W constant. Bertotti losses = 2,56W Since you mention I need to multiply by four, the end result should be like: P_input = 4200W + 13W*4 + 45W*4 + 2,56W *4 = 4442 W P_input from current sources = 6300W diference = 1800W **Considering mechanical losses=0. Also, the motor is running at 1500rpm.
3. Power balance error on Transient Magnetic

Thanks for answering, I've simulated a quarter and applied the periodicity to obtain the full motor. My actual bertotti losses are 2,58W * 4 quarters = 10W and I think it's too low. I'm not sure what I'm calculating incorrectly. I think I'm also mixing things up because I'm not sure when I need to multiply by 4 and when I don't need to. https://send.firefox.com/download/25f117c80a3e1ff3/#UjuguY_jRnr6PvaRreOgfg This is the link of my solved flu project. I did it on FLux 2018. On the advanced menu you can see the power balance macro, it came integrated on the software.
4. Power balance error on Transient Magnetic

Thanks for answering, I've simulated a quarter and applied the periodicity to obtain the full motor. My actual bertotti losses are 2,58W * 4 quarters = 10W and I think it's too low. I'm not sure what I'm calculating incorrectly. I think I'm also mixing things up because I'm not sure when I need to multiply by 4 and when I don't need to. https://send.firefox.com/download/25f117c80a3e1ff3/#UjuguY_jRnr6PvaRreOgfg This is the link of my solved flu project. I did it on FLux 2018. On the advanced menu you can see the power balance macro, it came integrated on the software.
5. Power balance error on Transient Magnetic

Also, I have a question regarding the Bertotti losses. It computes the average iron losses over a period but.. does it take into account the length of the motor or it just computes the loses on one slice of steel? Basically what I'm asking is, do I need to multiply the average losses * length of motor / thickness of steel slice to obtain the iron losses of the full motor?

7. How to simulate an Induction Motor using Transient Magnetic and current sources?

Alright thank you! I left it for a while and I could finally see some results. However I find it really weird, since with other motors I reach steady state instantly.
8. How to simulate an Induction Motor using Transient Magnetic and current sources?

I want to simulate an Induction Motor using current sources on flux. The circuit I'm using it's attached on a picture. Right now I've set the current sources with sinusoidal waves of current I_a=10*sin(100*pi()*TIME) and I_b=10*sin(100*pi()*TIME-(2*pi()/3)). However the electromagnetic torque curve gives really odd results. I've attached the Flu file of this motor as well, so you can hopefully find my error cause I'm lost. I know I can use steady state ac magnetic 2d to simulate this kind of motor, but I wanted to use transient magnetic. Thanks for your time, Have a good day. induccion.FLU.zip

Error with transient thermal - transient magnetic cosimulation. I´ve created the simulation following the flux documentation but after solving I get an error on the thermal side : BPR_RIDENT => REFPRO not found BPR_RIDENT => failed BPR_BSIMPLE => failed Also I can't see any result. The temperature remains constant.
10. Unable to calculate torque : there is no air zone around mechanical set : MECHANICALSET_ROTO

I'm doing a transient magnetic - steady state thermal cosimulation of a motor. I've set everything following the flux guide and started solving the problem. However on the thermal side I get an error saying "Unable to calculate torque : there is no air zone around mechanical set : MECHANICALSET_ROTOR". I didn't have this problem on the magnetic side and I had previously solved the transient magnetic problem and got a torque value correctly. What am I doing wrong here? By the way, the airgap is set manually to an air material that I have created that has similar properties to air. I think I did this because in the past I had problems when I set the airgap to be compressible air (or something like that).
11. Flux error related to motor periodicity and lines on the vertical axis

Thanks everyone! I've already managed to do it correctly. And @sts1983 I'll try your idea next time. It seems much easier and intuitive than creating a mesh line.

13. What's the formula for the FFT spectrum?

Thanks for answering.. But I was wondering if theres a way to create a 2d curve with the first harmonic module on the Y axis and different values of an I/O parameter on the X axis. Right now I can do the fft spectrum separately for each value of the I/O parameter but I don't know how to do a 2d curve with the values I mentioned earlier.
14. What's the formula for the FFT spectrum?

I want to create a 2D curve with the values of the first harmonic of TorqueElecMag(ROTOR) to see how it changes with an I/O Parameter. Is that possible?
15. Link current source angle to rotor mechanical set angle

Thank you for answering. What you propose works but I had to use the parameter ANGPOS_MECHANICALSET_ROTOR to define the rotor angle. The mechanical set creates this parameter automatically and is the one that determines the rotor position. I didn't find this info in the flux documentation and I think it's important: When you create a mechanicalset of the type "Rotation around one axis" the angle is determined by a hidden parameter called ANGPOS_*, where * is the name of your mechanicalset.
16. Link current source angle to rotor mechanical set angle

I'm designing a motor in which I need to set the current angle to be +60º from the rotor angle. At the moment I've created an I/O parameter (current_angle) to set the current source angle and then on the solving scenario I set both the rotor mechanical set position and this I/O parameter to compute different values. The issue with this mode is that it computes a lot of different values that I don't need, making the computation time extremely large. Is there any way to just solve the motor when the current_angle=rotor_angle+90º ?? To clarify a bit: rotor mechanical set position simulation values: 1,2,3....90 current_angle simulation values: 61,62,63...150 this gives 90*90 iterations = 8100 when I just need 90 iterations. My Aplication is a Steady State AC Magnetic 2D.
17. Failed Execution when trying to open a project on Flux

I'm afraid i can't do that. But I've already solved my issue. I just went inside `\name.FLU\persistent\Jython_log\` and copied and pasted the logs into the flux command prompt. I had some issues doing so but I edited the scripts and now I have a new proyect that's nearly like the old one but wihtout the issues that I was facing. Thanks anyway!