Brushless DC engine starting torque

[hyboxis79]

Can I rely on saying that the starting torque of a BLDC engine
is the multiple I_max*Kt .

I find it problematic because I am not sure BLDC controllers are entirely predictable

I would be glad for some help..

 

[GregLocock]

Any particular reason you are asking mechanical engineers? We don't believe in your puny electrons.



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[hyboxis79]

There are people in this forum who helped me with motors before so I don't see anything wrong with it.

 

[SomptingGuy]

Sense of humour failure or what? Eng-tips has many good places for these kinds of questions. This might be a good place to post.

http://www.eng-tips.com/threadminder.cfm?pid=237

- Steve

 

[zekeman]

Since the only difference between a PM motor (where the rotor is a permanent magnet) and a brushless DC is that the former is commutated by brushes and the latter is commutated optically (sinusoidal), then all of the formulae relating to the PM motor are applicable, including the linear relationships of T vs speed , torque vs current and stall torque proportional to stall current.