Recent content by rayallenvn

Hi all, Just a quick question about control of axial flux synchronous machine. Does it follow more or less the same technique ( which include PWM, inverter and dq transformation )? Is there any major difference from control of radial flux machine? Thanks in advance. Regards.

I thought this is the force required to keep the wheel rolling ( when it is already rolling ) . Once it stops , I believe we need additional force to make it roll again ( it may be because of the flat spots that Bob mentioned ) . But how to calculate that additional force is still vague .

Exactly the same confusion as Mart7x . When we consider a wheel alone , with no friction of bearings or axles , like a homogeneous steel wheel , still don't know how to calculate the force needed to make the wheel roll from rest . The rolling resistance , in theory , only takes place when the...

So is there any formula or way to calculate the initial force here ? For example , my project require to pull a truss that have steel wheels by a winch , and on steel rail track . So how to calculate the required line pull of the winch to be sufficient for pulling the system ?

Hi , thank you for you reply . I'm talking about the force required to start rolling the wheel . Rolling resistance only matters when the wheel already roll . Your explanation about the flat spot is helpful , but let's imagine we have 2 steel wheels ( alone ) on the rail track for example ...

Hi everyone , I've searched the answer for this question for a while , but haven't reach an satisfying explanation yet . Generally , from the study of friction , any force that's smaller than the static friction between the wheel and the ground would cause the wheel rolling ( Otherwise the...