brushed

engr_scotty's picture

Ping - Brushed Kollmorgen Tests

IMG_4452.jpg
10/11/2008: 3rd test ride: Farther. Went on a 5 mile loop. Very windy, long rolling hills for the most part. I adjusted the pedaling gears so that I could contribute from about 15mph-22mph. Everything went very smooth. This thing is really fast! Scary fast!

10/9/2008: Second test ride: This time with another rider with a spedo. Flats: about 23mph. Slight downhill hits about 28mph. Almost too fast for the 'hood. Ordered a ecrazyman brushed controller and throttle. This should make a big difference. I noticed that if I flip the switch too early (big current draw), the battery cuts out. I don't think this is a problem with the battery or BMS, just the BMS doing its job (I guess...).

10/6/2008: First test ride: Tightened everything REALLY good and installed the torque arm. Found a good, flat straight away and got up to about 20mph (estimated). Flipped switch and it took off...probably mid 25mphs...very strong pull. No noticable heat or general breakage. Will try it again and get a controller.

10/4-6/2008: Prepped Raleigh aluminum bike with Kollmorgen rear brushed hub motor. Motor is rated at 24V, so a bit worried about running it at 60V. Don't have a controller either, so this will be a "flip-switch" test with a 20a automotive switch. Have a 30A inline fuse too. Using somewhat small gauge wire 18ga.(?) so that there is a voltage drop to wheel. Have an old EV Warrior kickstand that I'm using, which is needed cuz this thing wants to fall over all the time with the batt. on the rack. First test: spun wheel with pedal and flipped switch: Wow. Went strong and very fast. Then I smelled burning and shut it down. The wheel had torqued itself loose from the mounts and nearly came out. Need to tighten things down....

Note that this is a pic of the Kollmorgen hub mounted in a "pusher" vehicle (see this photo if interested --> 122.jpg (32.78 KB) Didn't work great. Lots of wheel hop, and weirdness when turning. But it was easy to go from ebike to regular bike...)

124.jpg

10/1/2008: Hooked up charger and ran it over night. Charger ran RED for just a few minutes, then to green. No noticed "balancing" (turning red again). Charged voltage for this 48V pack is ~60V (!).

9/25/2008: Received Ping battery. 48V, 16ah, ~17lbs. Packaged well and arrived apparently safely with 2A charger. Was headed out for a 5 day trip, so had to leave it be :(

nasukaren's picture

Thinking about motors

This is where I'm going to write down some of my motor considerations.

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1. HXT 80-100-B 130Kv Brushless Outrunner (eq: 70-55) and its big brother, the 180kv model

These DC brushless motors look absolutely fantastic:
http://www.unitedhobbies.com/UNITEDHOBBIES/store/uh_viewItem.asp?idProduct=5139
http://www.unitedhobbies.com/UNITEDHOBBIES/store/uh_viewItem.asp?idProduct=5142

The price is fantastic ($150) and the power can't be beat. And the size is just right as well. The only problem is finding a speed controller that can handle their 100+ amps and is equally reasonably priced. I don't want to spend $400+ for an Alltrax AXE....

Hmm... looks like I can use a model R/C controller with a servo tester as an alternative.

The only other problem is the RPM.... 130 rpm / v = 130 rpm * 24 v = 3000 rpm...... ?

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