|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
74.130.29.193
In Reply to: RE: I'll bet... posted by user510 on January 14, 2017 at 12:10:50
As I stated earlier, I really don't know much about electric motors, but from what little knowledge I've gleaned recently, it seems that brushless DC motors are actually AC motors in the sense that without brushes and a commutator, the motor controller must switch polarity to the motor coils in order to make it run. Therefore, the motor controller is essentially providing AC power to the motor instead of DC power. Usually, the AC power takes the form of a square wave or trapezoidal waveform, but in this particular case the stationary coils are receiving true 3-phase sinusoidal power in order to eliminate cogging. In other words, the motor coils are connected in either a Y-configuration or a delta configuration. Therefore, the Condor motor controller converts DC to AC instead of the reverse as you suggest because the Condor is powered by a 24-volt DC wall-wart power supply and must generate 3-phase AC power to send to the motor.
Best regards,
John Elison
Follow Ups:
ouch. AC becomes DC then it becomes AC again. But we call it DC becuz...uh, it likes AC going into 3 phases but then it synchronises its whatzits to the quartz crystal oscillator .... and stuff.
ok that's beyond me. Like I said early, I'll trust in the designer's ability to do this. I do recall using the 'brushed' DC motors I had on my Teres that could run either off a wall-wart that converted AC to DC, or straight off a 12 volt battery (sized about like a large motorcycle would use). But obviously this little piece of tech you have is quite different.
Pretty cool, though.
-Steve
If you think about it, the commutator and brushes are there to transform DC into AC so the motor can run. You need an alternating magnetic field otherwise the motor won't turn. Consequently, aren't all electric motors really AC motors?I've never studied electric motors and I'm just guessing. Perhaps I'm wrong! ;-)
Best regards,
John Elison
Edits: 01/16/17
Yes. That seems likely.....and I suppose to all those who have actually studied electrical motors it should seem like one of the fundamentals. I guess a little reading up on what makes electric motors work would be useful.
thanks,
-Steve
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: