Recent content by thegala

Picture of motor and controller. Just experimenting before chassis arrive and we build our own controller.

I don't know what to say. You also are a tuft nutt. I realy think that you have knowledge on this topic but lets say you have more misconceptions then I do. Well I must say I am really disappointed about ignoring but what can I do about it. Nothing so I don't care. And thank you for nice...

Yes you control a motor with a dc current but let's imagine in this way what sort of a current motor see. If you put a oscilloscope on A and ground what type of current wave form you will get. Sorry for so much split posts.

That commutation is actually also done in every AC motor just here you are doing it with some electronic you can't just use a DC you must reverse it.

I know but that is also reversing a current so you get an AC current shape.

Well in the video he is saying negative current. And yes a electronically commutated means that you are reverseing current or voltage if you what to be specific. So you get a AC current which proves my point.

Just to prof look at this pages http://www.researchgate.net/post/What_is_the_difference_between_BLDC_and_PMSM_motors http://control.com/thread/1026172925 And this video http://www.youtube.com/watch?v=ZAY5JInyHXY Well you see in video that for control of BLDC you should use a reverse polarity...

Yes they are not identical to AC synchronous motors only difference is their stator. Rotor is in both permanent magnet. BLDC motors are sometimes called a PMSM. Or you could define it this way BLDC motor with a trapezoid back EMF and a BLAC a motor with a sin Back EMF. But they are controlled...

Ac motor is every motor that use alternating current so BLDC motor uses a AC current of any shape so you can use a sin or square wave. Electronic for BLDC or to be precise a transistor or bridge layout is a same if we talk about same phase power inverter and esc. So what for you is ac...

Ac motor is every motor that use alternating current so BLDC motor uses a AC current of any shape so you can use a sin or square wave. Electronic for BLDC or to be precise a transistor or bridge layout is a same if we talk about same phase power inverter and esc. So what for you is ac...

Have you read a Wikipedia article they clearly state

No they called them that way because they purpose is to be powered with battery dc source. But you must control them with a ac of any shapn e( triangle, square, sin). This ia probably reason for that wierd name. I know in start it was confusing, but it's a ac motor. Just check Wikipedia about...

No it's a ac motor with permanent magnet.

Of course you are right but gear ratio will be made in that way that i will always be around most efficient motor point. But of course I will use 200A 600V Igbt bridge for esc. My motor just pick 5kW 96V http://www.goldenmotor.com/frame-bldcmotor.htm

Well efficency of my motors (mechanical output efficiency) is about 90%. Electrical power of motor is about 5kW with peek of 7,5kW. So if a voltage of motor is 100V then max current is 75A. Battery current drain then is about 100A and esc should be rate at 150a at least. So you are right I...