How to find BLDC motor power and torque rating with torque constants and other given parameters

Hi, can anyone help me out with this!

I am currently working on simulating a solar pv fed bldc motor in simulink software. I have the datasheet values of bldc motor from a iet journal as Number of poles, P = 6; rated speed, Nrated = 3000 rpm; stator resistance, Rs = 0.41 Ω; stator inductance, Ls = 2.13 mH; voltage constant, Ke = 78 VL-L/krpm.

But in Simulink I took the PMSM motor with trapezoidal back emf but I have option only to input the a) pole pairs b) Rs & Ls (phase to phase values), c) Voltage constant or torque constant or flux linkage as given in matlab documentation. Kindly check the link. I have no option to enter the rated power and speed of the bldc motor in simulation model.

1) In this case, if I enter the parameters that can be inputted to the model, then how we can find that motor with that given voltage constant (say 78 VL-L/krpm), Rs, Ls, pole pairs is a machine with rated speed of 3000 rpm?

2) Also, how to find the rated torque for this machine if the frequency of the input voltage to bldc motor from inverter is changed periodically based on gate pulses from hysteresis current controller?

I don't know much about the bldc motor & simulink so please go easy on me. If there is any specific relation that connects these terms kindly let me know.

[Shaik]

Can you please let me know if you get the answer same problem i have simulation parameters of BLDC motor but i don't know the rpm and voltage of that bldc motor what is the relations how to find please if you know the answer reply thanks

Answer 1

[Joel Van Sickel]

Use the button "Compute from Standard Manufactuere Specifications" To see a better way to get these parameters from data sheets. Unfortunately, sometimes you don't have enough details to completely get the parameters, so in that case you have to make an educated guess based on similar sized motors, power levels, etc. This is obviously hard to do if you don't know much about the type of motor you are using. You can also try calling the vendor to get more information, but this is hard to do when copying values from an academic journal.