How do I find the mechanical time constant of brushless AC serco motor?

The typical approach to designing flight control systems is to design an inner control loop to stabilize vehicle attitude and angular rates, while an outer loop tracks vehicle position. The reason given for the above is that attitude dynamics is "faster" than the translational dynamics. The theory of time scale separation in dynamic systems seems provides an answer to this question but What is the physical intuition behind this argument? Also, Is it possible to design a controller that does not consist of multiple cascading loops?

How can reduce the size of high frequency transformer ?kindly guide

The relation between the number of the pole to stator slots its effect on the torque ripple.

I've difficulties to find a good documentation or a book to how to design an outrunner BLDC motor. My propose is, defined RPM and approximative kW and some other parameters, which are correct steps to design a BLDC motor? Objective is to design a motor for UAV and learning from this (and have fun).

What I've actually found is:

- Blogger with photos or videos of their projects with some parameters but without any design tips or design files;

- Highly theory books, very wide, but actually without any practical application;

- Some research documentation that treat only some aspects.

Since it's for hobby proposes, I'd like to avoid months or theory but learn with some simulation trial and error.

Are appreciated good books, or documentations. Maybe I'll get some base to start with and then I'll create my own experience.

p.s. Highly theory books will be also good, but those that at least treat also specific BLDC motor model that is outrunner. Learning tons of theory applied on common motors and then lead back this to outrunners without any specific topic analysis well.. it's not as fun as I mean.

I have a problem shifting a three PWM signal (10KHz Saw-tooth wave form) with the second signal shifted form the first by Time delay = 0.00005 and the third shifted by 0.000025 from the first signal, is it possible to get this and extract this three control signals (C1, C2, C3) to control the gates of the converter ? any tips or suggestions. PLS take a look at the picture included.

This is sound stupid but it is real happening to me. I have an engine model with the cylinder volume equation:

V_cyl = V_min*(1 + 1/2*(V_max/V_min - 1)*(l/a + 1 - cos(theta) - ((l/a)^2 - sin(theta)^2)^(1/2)))

I have a problem to calculate the 'theta', for any 'V_cyl' value. Can anyone advise me on how to inverse the above equation? I used the Maple software to solve for 'theta' but it gives the wrong solution (I recalculate the 'theta' using the above equation, it does not give back the 'V_cyl').

I'm trying to simulate BLDC motor with 120 degrees Squarewave. I use the motor's parameter from the attached file "Healthy BLDC ....... ". I simulated 120-degree square waves current form like default maxcir of Ansys maxwell 2D. I simulated motor at 1500 rpm, rated speed with an initial angular 7.5 degrees.

I achieved some results by Simplorer but it doesn't correspond with Ansys maxwell 2D simulation.

I don't know where I did wrong.

Thank you for your help!

Note: Nameplot : Simulated by Maxwell 2D

Nameplot_1: simulated by Simplorer.

How it influences the acceptance of the research paper?