brushless mars vs golden motor?

[thedarlington]

hey guys can anyone give me the headsup on what the differences are? i cant find the specs of the mars, golden claims 5-10kw, what should one look for when comparing brushless motors?

also what pros and cons do you guys see in general to brushless vs brushed mars? ive read brushed motors need adjusting like every half hour and going inside changing contactors (or brushes) like every 4 hours --yet if the famous eteks where brushed, how could they be touted as so good and reliable if they suffered from this? wouldnt it also make sense that scooter companies like shwin and izip stopped going brushed with all the headache it caused?

 

[enoob]

well take it for what its worth as im just learning this stuff myself .

#1 eteck orgin came from industrial needs but the form factor and power output suits many needs

mars and brushless versions came after as the popularity grew.

the golden is a knock off of the overall design

dont know were your info on brushed motors comes from but id say it has something to do with application . most brushes im familiar with will give many hundreds of hours of operation with out any maintenance as do the brushed eteck/mars.

otherwise brushed= dont even need a controller but power and rpm restrictions
brushless= better power and rpm but spendy controller, possibly inferior efficiency

 

[liveforphysics]

The golden motor is an axial flux design, as is an Agni, and as are all of the most efficient and best power/weight motors out there.

Brushless axials have all the advantages in a motor design. Slowly you will see the world switching from radial to axial type designs (like the golden motor or an Agni).

 

[enoob]

i think this mars is axial ?

have assumed it is . better look i guess

 

[liveforphysics]

i think this mars is axial ?

have assumed it is . better look i guess

I don't know about the brushless, if it is, that's fantastic! Pick which ever motor has a large diameter rotor in that case.

I've only seen a brushed Mars taken apart, and it was radial flux.

 

[enoob]

straight from mars web site

"Designed for long life. No brush maintenance. The motor is 90% efficient at voltages between 24 to 48 VDC. Continuous current of 100 amps at 48 VDC. This is a 3-phase, Y-connected Permanent Magnet Syncronous Motor with an axial air gap."

had me worried for a bit never really paid attention to that

 

[liveforphysics]

straight from mars web site

"Designed for long life. No brush maintenance. The motor is 90% efficient at voltages between 24 to 48 VDC. Continuous current of 100 amps at 48 VDC. This is a 3-phase, Y-connected Permanent Magnet Syncronous Motor with an axial air gap."

had me worried for a bit never really paid attention to that

Hooray for axial brushless design! Great to know, thank's Enoob.

Soon I think we will see radial flux DC motors start to disappear.

 

[thedarlington]

wow thanks for sorting that out guys, really helps when you got no clue, i wish this stuff where a bit more standardized it can proove overwhelming for someone new to the scene, so what is your take on brushed designs then guys? i was thinking of buying me a cheap 450w or 1000w brushed just to get my feet wet and connecting it directly to practice setting things up,

by the way enoob where u ever able to ge a hold of those eteks for sale? aussiejester told me about it but now i cant seem to find that thread

 

[enoob]

yup . have one right now and i am to meet with George again early next week . was bout to update this thread to fill in the interested party's. so far 3 maybe 4 gents want one.
http://endless-sphere.com/forums/viewtopic.php?f=9&t=16584

ill have it updated in the next 24hrs, hoping to talk to George before that try an get him to join es.

and personally i see nothing wrong with brushed . all depends on your application an needs just be wary if you start feeling the need to run a brushed motor past its rating.