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help on selcting a BLDC motor

P

pmm

Jan 1, 1970
0
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 &regards
PMM
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that pmm <[email protected]>
wrote (in said:
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 &regards
PMM
Where will you get a 3ph DC supply?
 
T

Tim Wescott

Jan 1, 1970
0
John said:
I read in sci.electronics.design that pmm <[email protected]>


Where will you get a 3ph DC supply?

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.
 
R

R Adsett

Jan 1, 1970
0
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.

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
 
T

Tim Wescott

Jan 1, 1970
0
R said:
[email protected] says...
snip



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

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.
 
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