Search found 481 matches

by Solcar
May 30 2019 10:47am
Forum: E-Bike Non-hub Motor Drives
Topic: Friction Drive Project
Replies: 5
Views: 2131

Re: Friction Drive Project

I decided to revive my low power friction drive project. I've removed the first mechanical gain stage. The increased motor windings loss should be offset by lower mechanical loss. The drive roller now is about a 2" rubber instead of a 2½" hard polyurethane one. The increased loss from the normally e...
by Solcar
Feb 12 2018 9:15am
Forum: E-Bike Non-hub Motor Drives
Topic: Friction Drive Project
Replies: 5
Views: 2131

Re: Friction Drive Project

Well, thought it would be good to update on the outcome of the project. It didn't work because the losses were too great. The greatest loss seems to have been from pressing the roller into the tire, even though I used a 2½" diameter one. I wouldn't want to use different tires besides the regular bud...
by Solcar
Aug 06 2017 7:36am
Forum: E-Bike General Discussion
Topic: 2nd Bike w TSDZ2 assistance, this time to help with injury
Replies: 35
Views: 2417

Re: 2nd Bike w TSDZ2 assistance, this time to help with inju

RTIII, I have used a notion that I heard quite a long time ago, that the main thing to consider in the sizing of a bike is that when seated, the feet should be able to reach the ground. That is with only the toes being able to reach and still be flat on the ground, but that is the only part of the f...
by Solcar
Jun 18 2017 2:01pm
Forum: E-Bike General Discussion
Topic: Can a 10W 5ohm resistor take 100V for 3 seconds?
Replies: 27
Views: 2342

Re: Can a 10W 5ohm resistor take 100V for 3 seconds?

Are the results affected by different ohm of different resistors? If for example I use a huge resistor with 5ohm vs 10ohms etc... A 10 ohm resistor draws less current than a 5 ohm. The battery internal resistance is somewhat constant, however. I see it is internal resistance rather than infrared th...
by Solcar
Jun 17 2017 8:25pm
Forum: E-Bike General Discussion
Topic: Can a 10W 5ohm resistor take 100V for 3 seconds?
Replies: 27
Views: 2342

Re: Can a 10W 5ohm resistor take 100V for 3 seconds?

Why not use an incandescent light bulb as an infrared source
by Solcar
Jun 17 2017 5:23pm
Forum: E-Bike General Discussion
Topic: Can a 10W 5ohm resistor take 100V for 3 seconds?
Replies: 27
Views: 2342

Re: Can a 10W 5ohm resistor take 100V for 3 seconds?

Inwo wrote:
Solcar wrote:5 Ohm resistor connected to 100v
Good answer.

Who are these guys. :)
Thank you
by Solcar
Jun 17 2017 4:27pm
Forum: E-Bike General Discussion
Topic: Can a 10W 5ohm resistor take 100V for 3 seconds?
Replies: 27
Views: 2342

Re: Can a 10W 5ohm resistor take 100V for 3 seconds?

5 Ohm resistor connected to 100v
by Solcar
Jun 17 2017 3:47pm
Forum: E-Bike General Discussion
Topic: Can a 10W 5ohm resistor take 100V for 3 seconds?
Replies: 27
Views: 2342

Re: Can a 10W 5ohm resistor take 100V for 3 seconds?

I'm just going to give my answer without looking at the others, so my perspective is fresh.
P = V²/R

= 100²/5

= 10000/5

=2000w

I think that your resistor will burn out before three seconds at that power level since that is 200 times the power rating.
by Solcar
Jun 06 2017 10:42pm
Forum: E-Bike Non-hub Motor Drives
Topic: Friction Drive Project
Replies: 5
Views: 2131

Re: Friction Drive Project

A lot of problems in life have been keeping me from working on the charger/controller unit. However, since I had the car battery jumper devices, I decided to place their outputs in parallel and try out the friction drive using the old 12v lead acid battery-powered controller powered by them instead....
by Solcar
Jun 06 2017 9:39pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5440
Views: 408269

Re: new eZip motor

I hope they hurry with the overcoming aging. It just occurred to me we have another option concerning dual driving a rear wheel. I just remembered that two freewheels can be placed on the pedal (right) side of a wheel hub. One way is two normal freewheels can be squeezed onto the same side of a thre...
by Solcar
Apr 28 2017 8:12am
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5440
Views: 408269

Re: new eZip motor

About loose female spade connectors, often pliers can be used to squeeze them carefully, so they will go on tighter. Squeeze them when they are off of the terminal and try them on, trial and error. If the result is too tight, they can be opened up some with a knife blade.
by Solcar
Apr 16 2017 4:41pm
Forum: E-Bike General Discussion
Topic: Jump Starter Battery Pack
Replies: 0
Views: 353

Jump Starter Battery Pack

Things have been pressing for the last several years. The ebike project had been sidelined for a long time. I had mostly finished a controller/charger device and was hoping to try it out on my custom friction drive that had drawn upon ideas from the community here. But then the floor of a third of t...
by Solcar
May 12 2016 10:02pm
Forum: E-Bike Non-hub Motor Drives
Topic: My new RC mid- drive ebike
Replies: 7
Views: 1942

Re: My new RC mid- drive ebike

I use plastic #25 chain, which is good for up to about 50lbs, to my knowledge. It is quieter than steel and it generally is lubricant free, and I use it in the first stage of two stage reduction projects. My experience is it is only about 1/3 as noisy as steel chain. It might not be rated as high in...
by Solcar
Apr 20 2016 10:09am
Forum: E-Bike Non-hub Motor Drives
Topic: Friction Drive Project
Replies: 5
Views: 2131

Re: Friction Drive Project

The new season of working on the project is under way. So far this spring, all work has been on the charging portion of the controller /charger unit. I have been wanting to use TLP352 opto coupled MOSFET drivers for simplicity in the transformer drive. Another feature of the charge circuit is how th...
by Solcar
Apr 20 2016 2:17am
Forum: E-Bike Non-hub Motor Drives
Topic: Flat belt drives?
Replies: 9
Views: 1189

Re: Flat belt drives?

Some of my early ideas for low power ebike drive involved using a vacuum cleaner belt in the first reduction stage. An advantage I see with it is that it is quiet. Another plus is low cost. Also, there is convenience in being able to buy a part from the department store.
by Solcar
Apr 16 2016 12:31pm
Forum: E-Bike General Discussion
Topic: Freight for Lithium Batteries
Replies: 7
Views: 573

Re: Freight for Lithium Batteries

I've been even making up LiFePO4 packs(always with BMS) , charging & selling for e bikes for 8 years & never had a problem the only one was with Nickel cadmiun drll battery that I shock treated & forgot dam near lost the shed. That example with coins in with battery cells could happen with any batt...
by Solcar
Oct 12 2015 2:00pm
Forum: Motor Technology
Topic: Sensorless, halls, encoders, motor efficiency?
Replies: 28
Views: 4349

Re: Sensorless, halls, encoders, motor efficiency?

Thinking of a rider on a swing, the push should be timed at right after the rider reaches rear peak height. With a motor, right after peak magnetic field falls on the coil would be the time when adding energy contributes most efficiently to the rotational energy stored in the motor.
by Solcar
Oct 11 2015 8:39pm
Forum: E-Bike Technical
Topic: One hall sensor possible in BLDC control?
Replies: 1
Views: 274

One hall sensor possible in BLDC control?

I was contemplating brushless motor control and ways to simplify it. There are single phase brushless motors, but those are usually used only for low power because of high torque ripple. It seems it could be possible to get the benefit of a single hall sensor that a single phase BLDC ought to need, ...
by Solcar
Sep 20 2015 5:10pm
Forum: E-Bike Non-hub Motor Drives
Topic: Friction Drive Project
Replies: 5
Views: 2131

Re: Friction Drive Project

Okay, i may as well bump my friction drive project thread. I don't have further to say on the motor drive assembly this year. I've been working on the motor controller / charger. It occurred to me lately that the charger is more important than the motor controller because without the charger, the ba...
by Solcar
Aug 07 2015 8:00pm
Forum: E-Bike Non-hub Motor Drives
Topic: Commuter Booster - <1kg Friction Drive
Replies: 1345
Views: 251721

Re: Commuter Booster - <1kg Friction Drive

Your welcome, good luck!
by Solcar
Aug 07 2015 4:16pm
Forum: E-Bike Non-hub Motor Drives
Topic: Commuter Booster - <1kg Friction Drive
Replies: 1345
Views: 251721

Re: Commuter Booster - <1kg Friction Drive

I think I see the problem. At full engagement, I believe the motor should go slightly beyond the peak pressure engagement point and settle in slightly beyond. Otherwise, if the motor isn't pushing against the tire during heavy assist, like during acceleration, the wheel can push the unit back toward...
by Solcar
Jul 01 2015 4:58pm
Forum: Battery Technology
Topic: Bottom balancing?
Replies: 479
Views: 27516

Re: Bottom balancing?

All battery chemistry's act different in balancing and different lifepo4 cells act different when charging and balancing. So what lifepo4 cell are we talking about and for what use. So what demands are you putting on the battery. Charging and discharging. Makes a big difference in balancing. We nee...
by Solcar
Jul 01 2015 9:49am
Forum: Battery Technology
Topic: Bottom balancing?
Replies: 479
Views: 27516

Re: Bottom balancing?

I was contemplating how to best keep dealing with my lifepo4 batteries as simple as I could and found Jack Rickard's ideas seeming to make sense as I was looking on the Web for ideas. He says that the battery pack of series cells is limited by the weakest cell, so the best way to use lifepo4 packs i...
by Solcar
May 30 2015 2:58am
Forum: E-Bike Technical
Topic: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier
Replies: 948
Views: 112987

Re: The SB Cruiser: Amberwolf & Dogman's CargoTrike & DogCar

Concerning things like cutting off axle ends and then later finding things are way suboptimal afterwards, ain't it the truth.