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Re: Mathematical models

leitralad — Mon, 09 Nov 2009 17:52:08 GMT

Shaft speed squared may be true at full power, but I'd like to see evidence whether it is strictly true when throttled. The eddy current and hystersis loses

Re: Mathematical models

mileshellon — Mon, 09 Nov 2009 12:23:25 GMT

Comparable with hysteresis losses would make them a significant portion then.... Eddy current losses are proportional to shaft speed squared. Miles

Re: Mathematical models

C POLLARD — Mon, 09 Nov 2009 01:17:59 GMT

... * Then just use the high temp value or the one for the current you normally run at. ... * I don't agree that eddy current losses are a significant portion

Mathematical models

leitralad — Mon, 09 Nov 2009 00:26:08 GMT

ScorpionCalc and the other programs that predict motor performance use three motor characteristics, Rm, Io and Kv, that are assumed to remain constant

Re: Velomobile Design

jgtetz76 — Mon, 02 Nov 2009 05:29:51 GMT

Ok maybe this will go thru. been trying for the last couple of days ... I need IC for touring but electric seems the best solution for commuting and around

Having problems signing in again

jgtetz76 — Mon, 02 Nov 2009 05:17:04 GMT

This is a test. John Tetz

Re: Velomobile Design

John Clary — Sat, 31 Oct 2009 18:39:11 GMT

... OK there is a rating system issue here. The ICE is rated at maximum power and usually runs around 450-500 Watts. Electric motors are rated at continuous

Re: Velomobile Design

Hugh Currin — Sat, 31 Oct 2009 15:20:51 GMT

John: You're right. Let me first explain where those numbers come from and then modify them. The specs are currently being developed so your input comes at a

Re: Velomobile Design

jgtetz76 — Sat, 31 Oct 2009 04:00:30 GMT

... ......Hugh Why is the power so high? Your calling this motor an assistance. At this kind of power the vehicle could be considered a motorized vehicle with

Re: Velomobile Design

fred — Thu, 29 Oct 2009 09:55:47 GMT

Justin, at ebikes.ca, not only makes great product, but he's a great person to boot. You may consider suggesting to your crew to contact him for

Re: Velomobile Design

currinh@... — Thu, 29 Oct 2009 03:51:09 GMT

Fred: Thanks for the lead. This has most if not all of the needed functions. I hadn't seen it before, I have to get out more. It sounds like it won't work

Re: Velomobile Design

Wm Bates — Wed, 28 Oct 2009 19:30:06 GMT

I'm not sure what campus you and your students attend but wanted to extend an invitation to you. On Memorial Day Weekend Oregon Human Power Vehicles (OHPV)

Re: Velomobile Design

fred — Wed, 28 Oct 2009 19:02:39 GMT

You might consider the CycleAnalyst CA-DPS if you use a "standard" e-bike controller. The CA-DPS connects to the

Velomobile Design

Hugh Currin — Wed, 28 Oct 2009 18:48:01 GMT

ULEA List: I have a group of students embarking on a velomobile deisgn. There are 5 mechanical students working on the trike and fairing, three mechanical

Re: Waterproofing

jgtetz76 — Sun, 18 Oct 2009 04:53:19 GMT

... Hello Elden Hmmm moisture problems. I havent had any and Ihave even ridden in the rain. I have ben off the air becuae Yahoo rejected my user name and