ampflow motors?

[Chambers]

Hey guys,

I'm a newb here so go easy ...

Has anyone actually used one the ampflow motors in a mid drive setup? http://ampflow.com/ampflow_motors.htm
I did a bit of a search around and only found people thinking of using them..

What got me wondering was I found this on you tube... http://www.youtube.com/watch?v=5BXX3x5NyJg&feature=mfu_in_order&list=UL

I know it's got no pedals but the ideas the same, Thought it could be pretty neat maybe with a Thud-style 2 speed jammed in there too!

Thanks

Simon.

p.s- sorry if I posted this in the wrong place

 

[Chambers]

I suppose also what I'm asking is what(if any) would the benefits of running one of these brushed motors vs running say a rewound outrunner Except of course maybe a little bit of noise difference.


Thanks again.

 

[voicecoils]

I have a C40-300 sitting in a box. http://www.magmotor.com/brushed/c40.pdf

I thought about trying to use it on a hardtail a few years ago but it's difficult to package. It would be lovely in a custom frame though, perhaps run at about 4 kW peak.

Mine's heavy compared to most RC motors and is designed for low voltage (24v) but besides that, it has pretty good efficiency and can be controlled by reliable brushed controllers available with high current handling.

The bike in that link looks like fun!

 

[amberwolf]

The biggest (and only, usually) advantage of brushed motors over brushless is that their controllers are much simpler, and often used to be less expensive for higher power levels. Nowadays, brushless is common enough and brushed less common, so costs are likely equal (or maybe even table-turned), so unless you're building your own controller for it, it'd likely be more efficient to use a brushless motor, and the brushless is likely to run cooler and quieter.

If you have a brushed motor that runs quieter than the brushless, then most likely either the brushless is running at notably higher RPM, or it's being commutated noisily by the controller (common with trapezoidal controllers, which are the most common kind, and cheaper, vs sinusoidal ones that may significantly lessen noise and possibly make the motor run more efficiently, depending on how it's wound and designed, I think).

Of the few that I have been able to directly compare nearly identical loads and RPMs and sizes and whatnot (mostly very small ones in devices like CDROMs and other media devices) over the years, the brushed were noisier because of the hiss of brush contact, where the brushless only had the noise of bearings or whatever they were driving. Not something I went out specifically to test, just what I noticed while repairing various devices ro taking them apart to play with the bits.


My personal take on it is use what works for you (or in my case, use what I have ), so if you don't have a specific need for one type or the other, and their performance/etc. is similar enough, go with what your budget dictates.

 

[Chambers]

The biggest (and only, usually) advantage of brushed motors over brushless is that their controllers are much simpler, and often used to be less expensive for higher power levels. Nowadays, brushless is common enough and brushed less common, so costs are likely equal (or maybe even table-turned), so unless you're building your own controller for it, it'd likely be more efficient to use a brushless motor, and the brushless is likely to run cooler and quieter..

Thanks amberwolf, I was thinking along the lines of simpler/cheaper controllers, Noise isn't really a problem for me but if I had a choice at the same performance levels I would choose quieter.

My personal take on it is use what works for you (or in my case, use what I have ), so if you don't have a specific need for one type or the other, and their performance/etc. is similar enough, go with what your budget dictates.

Totally true and excellent advice!

Voicecoils,

I have read a few posts of yours regarding this motor and wondered if you ever got around to using it...
Whatever I end up building it will definitely be custom frame as that's alot more to my skill set than electronics :lol:

Thanks Guys.

 

[panurge]

This question about Ampflow motors is Interesting.

For a dual motor setup, with a single controller it seems to be a good option, I have a couple of used A28-150 motors from a destroyed fight-robot, but without controller.....anyway the A28-300 has a lot more torque......

Maybe after the Astro-RC setup I'm playing with, I will try the brushed Ampflow way, starting buying one of the 160A controller, or anyone here has other cheaper Controller option to suggest for them?

Jules