Search found 185 matches

by mclovin
Jul 31 2009 12:41pm
Forum: E-Bike Non-hub Motor Drives
Topic: What Makes An Induction Motor an "RC" Motor?
Replies: 8
Views: 1012

Re: What Makes An Induction Motor an "RC" Motor?

Induction motors don't use permanate magnets. Here are some general statement differences between the two types of motor. Keep in mind, these are general trend differences, I'm sure there are exceptions. Induction motors have better efficiency at light throttle loads than PMBLDC motors at light thr...
by mclovin
Jul 31 2009 12:33am
Forum: E-Bike Non-hub Motor Drives
Topic: "Rolling My Own" Windings
Replies: 16
Views: 2209

Re: "Rolling My Own" Windings

ron van sommeren,
Just to clarify....I'm assuming that when you say that a motor hits a heat "limit" that beyond that limit the motor will fail?
by mclovin
Jul 31 2009 12:29am
Forum: E-Bike Non-hub Motor Drives
Topic: What Makes An Induction Motor an "RC" Motor?
Replies: 8
Views: 1012

Re: What Makes An Induction Motor an "RC" Motor?

Thanks Miles,
I didn't really think there were any "true" differences other than RCs being a permenant magnet design and made to be very small, comparatively, and in general have a high Kv.

I never hurts to ask.

Cheers.
by mclovin
Jul 30 2009 6:24pm
Forum: E-Bike Non-hub Motor Drives
Topic: What Makes An Induction Motor an "RC" Motor?
Replies: 8
Views: 1012

What Makes An Induction Motor an "RC" Motor?

As the title asks, what differentiates an industrial induction motor from an RC motor? Is it simply the different Kv and Kt? I ask because I have spec.'d out induction motors when I was designing automated machinery and those were WAY different than RC motors. So, obviously the sizes and voltages ar...
by mclovin
Jul 28 2009 1:38am
Forum: E-Bike Non-hub Motor Drives
Topic: "Rolling My Own" Windings
Replies: 16
Views: 2209

Re: "Rolling My Own" Windings

Hi ron van sommeren, Thanks! That's very useful info. From what I've read here it sounds like the easiest way to get some numbers is to first start with a motor, get Kv them I'm off and running with my spreadsheets and such. Looks like I will need to spend some money up front. Oh well. Educations ar...
by mclovin
Jul 26 2009 11:13pm
Forum: E-Bike Non-hub Motor Drives
Topic: "Rolling My Own" Windings
Replies: 16
Views: 2209

Re: "Rolling My Own" Windings

Thanks! You guys rock...again. Yeah, I prefer emperical data to theory and numbers any time but........theory and number crunching are free (no need for a lab or expensive equipment) which is good as I learn. It's pretty cheap to crank out a hundred spread sheets of data but ultimately I'll need to ...
by mclovin
Jul 25 2009 6:12am
Forum: E-Bike General Discussion
Topic: How much more power?
Replies: 21
Views: 1091

Re: How much more power?

I suspect that cooling a motor will give the same efficiency as if the motor where just used for the first time that day. In otherwords, cooling a motor with ambient air will make it NO COOLER than the air's temp. itself. So, when your motor is totally cool (i.e. it has been sitting all night) and y...
by mclovin
Jul 22 2009 3:27am
Forum: E-Bike Non-hub Motor Drives
Topic: "Rolling My Own" Windings
Replies: 16
Views: 2209

"Rolling My Own" Windings

Hi All, Does anyone know where to look to get technical info on the ins-and-outs of windings? I understand magnetic flux density and all that but I'm looking for something that formulaic for, say, take a motor that is configured as "such and such" and if I wind it at , oh, 10T then I will need wire ...
by mclovin
Jul 19 2009 5:54am
Forum: E-Vehicles General Discussion
Topic: On the Streets of China, Electric Bikes Are Swarming
Replies: 18
Views: 1875

Re: On the Streets of China, Electric Bikes Are Swarming

Ok, please tell me, why are you in China? It's not a vacation spot that frequently occurs to me. My fiance is Chinese and lives in Beijing. I actually had her and another gal on the back a few times. It proved very convenient. Three people on a Chinese ebaike is a very doable thing so long as the r...
by mclovin
Jul 10 2009 11:51pm
Forum: E-Vehicles General Discussion
Topic: On the Streets of China, Electric Bikes Are Swarming
Replies: 18
Views: 1875

Re: On the Streets of China, Electric Bikes Are Swarming

I'm actually in China now. I looked at some ebikes and got some prices. The ebikes I looked at range from 1350-3000+ Yuan ($198-$441 roughly). I just bought one for 1600 yuan ($235). I believe it's a 48V system with 10-20AH Lead-acid batteries. I'm not sure on the specs as the seller didn't have muc...
by mclovin
Jun 29 2009 9:51pm
Forum: E-Bike Non-hub Motor Drives
Topic: Banding together for the E-bike cause.........
Replies: 45
Views: 2557

Re: Banding together for the E-bike cause.........

It is right Gary, Voltage goes up, current goes down, winding resistance goes up - it all balances. Same amount of heat generated in the motor. This is if you neglect field rise time. I know on paper it's just a simple matter of multiplying total power in by rated efficiency, and it gives you the s...
by mclovin
Jun 27 2009 3:46pm
Forum: E-Bike Non-hub Motor Drives
Topic: Banding together for the E-bike cause.........
Replies: 45
Views: 2557

Re: Banding together for the E-bike cause.........

Seems to me if heat is the enemy, why not choose not to create it rather than have to deal with getting rid of it? That's a good question. I don't know that we have a choice really - to generate heat that is. The wires in the motor are wrapped over themselves and around/through the steel lamination...
by mclovin
Jun 27 2009 1:57am
Forum: E-Bike Non-hub Motor Drives
Topic: 3D MCAD software
Replies: 28
Views: 6186

Re: 3D MCAD software

I just found this:

http://students7.autodesk.com/?nd=assis ... ome&lbon=1

It looks like it's possible to get free software from Autodesk. I don't know all the ins and outs but it's worth a look.

Cheers. :)
by mclovin
Jun 27 2009 1:42am
Forum: E-Bike Non-hub Motor Drives
Topic: Banding together for the E-bike cause.........
Replies: 45
Views: 2557

Re: Banding together for the E-bike cause.........

Hmm. I wonder. I hope I'm not too far off topic....... Just thinking out loud here: I would think that the greatest need for cooling would be during low RPM (high current) operation ergo low air flow moving over the motor. I wonder if the fins were mounted axially oriented and a fan affixed to the e...
by mclovin
Jun 26 2009 9:57pm
Forum: E-Bike Non-hub Motor Drives
Topic: Banding together for the E-bike cause.........
Replies: 45
Views: 2557

Re: Banding together for the E-bike cause.........

johnrobholmes wrote:Motors are the easy part IMO. Get them efficient, or get them big enough to bleed off the heat.
It seems that you and Matt prefer the Astro Flight inrunners - correct me if I'm wrong. Have you considered using a heat sink (i.e.fins) around the body of the stator? Do you think it's needed?
by mclovin
Jun 26 2009 9:52pm
Forum: E-Bike Non-hub Motor Drives
Topic: Banding together for the E-bike cause.........
Replies: 45
Views: 2557

Re: Banding together for the E-bike cause.........

Within the next year I will be releasing an Ebike specific controller that is made in the USA. It will have extra I/O ports and be built with hall sensor, temp sensor, and a few other inputs ready to go. Right now I have two RC controllers tying up my cash, but as soon as it is freed I will start d...
by mclovin
Jun 26 2009 12:24pm
Forum: E-Bike General Discussion
Topic: Tired of listening to high gas price wishers
Replies: 21
Views: 1017

Re: Environmentalists are so passé

Jerome Daoust wrote:Environmentalists are so passé.

The new trendy thing is being a Skeptical Environmentalist.
Being a polemic is nothing new.
by mclovin
Jun 24 2009 11:41pm
Forum: E-Bike Non-hub Motor Drives
Topic: 3D MCAD software
Replies: 28
Views: 6186

Re: 3D MCAD software

Thanks -- this is terrific! :D Personally I use Inventor... If there is good OS software then by all means...but I am getting that while there are a number of packages none immediately jumps to the top of the list, except perhaps Blender. So what commercial MCAD do you personally use? Roy Roy, That...
by mclovin
Jun 24 2009 4:38pm
Forum: E-Bike Non-hub Motor Drives
Topic: 3D MCAD software
Replies: 28
Views: 6186

Re: 3D MCAD software

Personally I use Inventor by Autodesk. It's a full blown (mid-range) 3D parametric modeler developed specifically for MCAD applications. It plays very well with AutoCAD and will export/import a great variety of other file formats. It also has built in "design accelerator" used for functional design ...
by mclovin
Jun 24 2009 12:29pm
Forum: E-Bike General Discussion
Topic: Bicycle laws
Replies: 41
Views: 1254

Re: Bicycle laws

These laws are poorly written and don't reflect very well how the technology works and are very inconsistent from jusrisdiction to jurisdiction (country to country). I suspect that homemade ebikers are rarely confronted by the Man over their bikes. I know - some of us have been ticketed but compared...
by mclovin
Jun 23 2009 10:16pm
Forum: E-Bike General Discussion
Topic: Bicycle laws
Replies: 41
Views: 1254

Re: Bicycle laws

..IMO it would be a very strong legal argument to say that the law can/should only apply to peak output power. To apply it to rated or input power would be a bit shaky I think. Canadian Federal and Ontario Law specifically refers to continuous output power measured at the shaft. Now.... it is not c...
by mclovin
Jun 23 2009 11:43am
Forum: E-Bike General Discussion
Topic: Bicycle laws
Replies: 41
Views: 1254

Re: Bicycle laws

I agree with GTA in that this law is more likely to be applied to a manufacturer of complete electric bikes. IMO Only the speed limit portion is likely to be applied to individuals. I don't think most judges are prepared to set legal precedence in regards to motor power definitions for ebikes. It wo...
by mclovin
Jun 23 2009 11:29am
Forum: E-Bike Non-hub Motor Drives
Topic: Drive Mounts and Irregular Tubing Shapes
Replies: 7
Views: 1061

Re: Drive Mounts and Irregular Tubing Shapes

This certainly isn't a typical lowcost, DIY solution but it's still interesting none-the-less. http://www.zcorp.com/images/239_010.jpg A 3D laser scanner could be used to model the profile of an irregular tube shape then a 3D model of custom designed mounting bracket could be made. Once you have a 3...
by mclovin
Jun 22 2009 7:33pm
Forum: E-Bike General Discussion
Topic: Tired of listening to high gas price wishers
Replies: 21
Views: 1017

Re: Tired of listening to high gas price wishers

First off, thanks for the feedback. Other views are most welcome. I have no doudt we are of similar mindsets if only differing (slightly) points of view. But.......folks will rethink how they use their cars and look for ways to shave dollars off the gas bill. That to my mind means: less miles, more ...
by mclovin
Jun 22 2009 1:59am
Forum: E-Bike General Discussion
Topic: E-bikes, the mechanical aspects
Replies: 12
Views: 589

Re: E-bikes, the mechanical aspects

Hi dozentrio, I know how you feel. And you're right, most of the "stuff" here is electrically oriented. I can only share my opinion on that one. It is impossible to escape the "e" part of ebikes and, fortunately, the folks here seem like a pretty sharp and experienced bunch electrically speaking. Th...