hi every one I need your help in selection a brushless DC motor as such some of you might worked on those ,know better than me , I am looking for a 3 ph BLDC motor under NEMA23 spec with a working voltage of 24vdc 3 amps with torque bit more than 40 oz please help me with a good part name on which working will be easy for a beginner thanks ®ards PMM
Believe it or not, he's using more or less correct terminology for brushless DC motors. A brushless DC motor is a synchronous permanent magnet machine that needs externally commutated multi-phase (3 phase is by far the most common) power from an external controller. Since the motors are designed so that the controllers are easily run off of low-voltage DC they're called "DC" -- even though the motor itself is an AC machine and nothing else.
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com
I read in sci.electronics.design that pmm wrote (in ) about 'help on selcting a BLDC motor', on Sun, 20 Feb 2005:
Where will you get a 3ph DC supply?
-- Regards, John Woodgate, OOO - Own Opinions Only. The good news is that nothing is compulsory. The bad news is that everything is prohibited. http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
I have no problem believing this -- for a lot of people the terminology trump the reality every time. With all the brushless motors that I know of the current at the motor terminal _does_ alternate, it's only the supply current to the controller that may maintain sign.
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com
I agree with you Tim, but I have had people insist it's DC since the current doesn't reverse direction (doesn't alternate).
Robert
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