Bicycle Hub Dynamo Subcircuit

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Jim Thompson 14 years ago

Here's my Bicycle Hub Dynamo Subcircuit, based on papers provide by Marcel:

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************ Hub Dynamo Subcircuit by Jim Thompson 2011_01_11
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*** KUQRMS = Voltage Coefficient RMS at 1 KM/H
*** RPS1KMPH = Revolutions per second at 1 KM/H
*** LI = Internal Inductance
*** RFE = Iron Loss Equivalent Resistance
*** RI = Internal Series Resistance
*** POLES = Number of Dynamo Poles
*** Node KMPH = Voltage Input at desired KM/H .SUBCKT HubDynamo KMPH OUTPUT COM PARAMS: KUQRMS=1 RPS1KMPH=0.139 LI=107.6mH

RFE=76.581 RI=7.3633 POLES=28 .PARAM RT2=1.414214 V_V1 KMPH 0 DC 0 AC 0

+PWL 0 0 50 50 L_LI VUQ N_1 {LI} R_RI N_1 OUTPUT {RI} RNOFLOAT1 KMPH 0 1G E_E1 VUQ COM VALUE {

KUQRMS*V(KMPH,0)*RT2*SIN(pi*V(KMPH,0)*RPS1KMPH*POLES*TIME) } R_RFE N_1 COM {RFE} .ENDS HubDynamo

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Please try it out and comment/criticize/embellish. ...Jim Thompson

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Joerg 14 years ago

Can't comment right now, doing an urgent gigeehoitz design. But ... I think everyone would just love to see a pic of you on the bicycle ... pleeeeze :-)

Regards, Joerg http://www.analogconsultants.com/

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Jim Thompson 14 years ago

I presently don't own a bike... I graduated to Z's in 1977 ;-) ...Jim Thompson

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Martin Riddle 14 years ago

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

Wheels are good aerobic activity.

My 83' Schwinn.

Cheers

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Bill Sloman 14 years ago

*******

=A0 =A0...Jim Thompson

Obviously a fair-weather cyclist - no mudguards. The Lycra brigade go all out for lightness, and in consequence the Lycra develops a broad stripe of dirty brown whenever it rains.

And the derailleur looks more Japanese than Italian. My local bike has Campagnolo gear. The Sydney bike is newer and still has the Shimano gear that it came with. I may trade up when it wears out (though I'll probably wear out first).

-- Bill Sloman, Nijmegen

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Fred Abse 14 years ago

I find that, the older I get, the more I need my Zs :-)

"For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." (Richard Feynman)

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Jim Thompson 14 years ago

I'm just the opposite. My body won't let me sleep more than about 5-6 hours.

When I was a student I once slept from the Wednesday evening before Thanksgiving until the afternoon of the following Sunday ;-) ...Jim Thompson

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Michael A. Terrell 14 years ago

Too much Tryptophan and wine!

You can't have a sense of humor, if you have no sense.

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Jim Thompson 14 years ago

In those days I was into Old Kentucky Tavern. The only wine I could get was at Giovanni's Italian Restaurant in Central Square... who defied the law and served to students :-) ...Jim Thompson

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Michael A. Terrell 14 years ago

I was out for five days once, with the Flu. I lost over 20 pounds and I couldn't even stand up, when I woke up. :(

You can't have a sense of humor, if you have no sense.

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Bicycle Hub Dynamo Subcircuit

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