Looking for a hydraulic brake sytem

[m4a1usr]

Guys ,

I'm going at building a braking dyno for testing brushless motors. There are 3 or 4 options for loading a motor but for my pocket book a go kart/ mountain bike 160mm hydraulic brake system is probably the easiest to attach to the test stand. What I want to build will test 380 size to a Lehner 3080. Anyone got something laying around in their garage you been thinking about tossing or you just plain forgot about? PM me or just hit my email. Thanks,

John

[NativePaul]

I think you'll cook a MTB brake in no time trying to brake a 3080, probably a cart brake too as a 3080 will put out as much as many carts do.

[marker]

John
You may be interested in this design using an eddy current brake.

http://www.aerodesign.de/peter/2001/LRK350/EM-4-2001/LRK_EM_4_2001_eng.htm

If you can get your hands on a Medusa Pro data logger with a thrust cell (no longer made ) it would make it easier to use.

http://web.archive.org/web/20080704164549/http://www.medusaproducts.com/Power-Analyzers/PA-60100R_package.htm

Mark

[m4a1usr]

I think you'll cook a MTB brake in no time trying to brake a 3080, probably a cart brake too as a 3080 will put out as much as many carts do.

The 160mm disk might be on the small side for the 3080. The 8mm thick 160mm diameter disks are being used in 150 to 250cc class go karts. And their jacked, not stock. Turning out 35 horse. A 3080 doesnt stand a chance against that. But I do want to stick to a 4mm disk if possible to keep the system adaptable to may size motors. I might have to adapt once I get a platform built.

John

[m4a1usr]

John
You may be interested in this design using an eddy current brake.

http://www.aerodesign.de/peter/2001/LRK350/EM-4-2001/LRK_EM_4_2001_eng.htm

If you can get your hands on a Medusa Pro data logger with a thrust cell (no longer made ) it would make it easier to use.

http://web.archive.org/web/20080704164549/http://www.medusaproducts.com/Power-Analyzers/PA-60100R_package.htm

Mark

I have used the eddy brake before along with a water brake but I'm trying to stay on the cheap side for this project. Thanks for the links though. I'm thinking what I'll probably be most interested in the small to medium powered BL motors we tend to use. I doubt I will be pushing a 2030 or 3080 for data. I was just going to build the bearing plates and alignment guides to adapt up to the big Neu's and Lehners. Havent decided on what data system yet. The Medusa looks fine but I have a bunch of National Instruements IO and AD boards left over from a similar PC based project using LabView. Besides I need to get back to programming if I want to retain any of the 2 week course I took last year. Great project stuff, but you need to use it frequently. At least I do. Not the sharpest tool in the shed!

John

[drwayne]

Use AC sink as dyno load.
Test plant driven Single phase AC motor ( cheap as fresh air..) feed to heater elements ( ACvoltxamps is sink product )
Inefficiency losses... ... with low budget dont expect perfect numbers.

Increased load acts as brake.