Interesting hub-motor

[Deleted member 4366]

I was browsing images, when I came across a motor with Birkestrand Electric Wheel written on the side. It looks like it's made in USA. I never heard of it, so I did a search through the very sparse info, and I found the patent from 1999, which includes drawings. They call it a triple shaft motor. The Xiongda YTW-06 is called a double shaft motor, so I'm wondering if the two are similar. Here's the link to the patent:
https://patentscope.wipo.int/search/en/detail.jsf?docId=WO1999058394&recNum=1&maxRec=&office=&prevFilter=&sortOption=&queryString=&tab=PCT+Biblio

It has some interesting features: It's oil-cooled; it has a connector directly on the end of the axle; 24v rated at 500W; very compact; built in torque arm, no clutch so that it can be used as a brake and regen.

 

[flecc]

I've mentioned this a few times in the forum. It failed in the US market and the rights to it were bought by Sanyo. After extensive changes they supplied it to Giant for their new generation Twist electric bikes, the Twist 1 with twin pannier lithium batteries and the Twist 2 with NiMh twins. In those it retained the regen, but they were too expensive and not good performers, so failed in the market. In the later Twist Express models Giant had the regen removed by an integral freewheel, improving the performance somewhat.

Sanyo have since been absorbed by Panasonic who make all the e-bike motors now.
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[Deleted member 4366]

I thought that the Giant twist motor was more like a conventional single axle hub motor?

 

[flecc]

I thought that the Giant twist motor was more like a conventional single axle hub motor?

It certainly ended up that way. By the time Sanyo and Giant had finished there seemed to be little left of the original Birkestrand design, other than the regen. It puzzled me them buying that design in the first place, but I suppose they wanted to feel their way into e-bikes with electronics rivals Yamaha and Panasonic so heavily and well established into them.
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[Deleted member 4366]

I guess that there weren't many geared motors around back in 1999.

 

[flecc]

I guess that there weren't many geared motors around back in 1999.

Indeed, it was very much crank motor time, the Yamaha PAS from 1996 on, the original very heavy Giant Lafree from 1999 and it's much better successor from 2000, plus crank motor Honda and Panasonic folders.

It was 2004 when Bafang hub motors first surprised here in Britain with their abilities.
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[skoleskibe]

I guess that there weren't many geared motors around back in 1999.

Well there where the expensive Heinzmann motors, of which i’ve owned a few.
They’re monster strong, geared DC motors, only floor is that the brushes tend to hang after some years of use.

Danish postalservice uses them extensively

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[Deleted member 4366]

They’re monster strong, geared DC motors

And they're only "200W ", yet still they can give that massive power with their 33 amp controllers. Hang on: 36v and 33 amps is 1188W when I went to school.

 

[Woosh]

And they're only "200W ", yet still they can give that massive power with their 33 amp controllers

they are quantum motors, any wattage is simultaneously possible but I guess you know that already. No need to worry about the label.

 

[skoleskibe]

they are quantum motors, any wattage is simultaneously possible but I guess you know that already. No need to worry about the label.

Highest measured effect i’ve had was about 4years ago on a 24v heinzmann with lipo batteries was 56 AMP at 27-28V giving spinning frontwheel at more than 1kw in and probably more than 700w out


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