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by spinningmagnets
Aug 05 2020 7:21am
Forum: Battery Technology
Topic: Spot weld cell puncture - how 'catastrophic' is this?
Replies: 4
Views: 290

Re: Spot weld cell puncture - how 'catastrophic' is this?

Its "probably" OK, but...if it's a problem, the worst-case scenario is a battery fire. The downside is steep, so...I wouldnt risk it.
by spinningmagnets
Aug 05 2020 7:14am
Forum: E-Bike Technical
Topic: 52V / 24Ah triangle battery from Lunacycle is only charging to ~55V | it isn't the charger, already tried to jumpstart
Replies: 6
Views: 115

Re: 52V / 24Ah triangle battery from Lunacycle is only charging to ~55V | it isn't the charger, already tried to jumpst

A nominal 52V pack is 14 cell-groups in series. The specific voltage you mention suggests that one cell is bad, and it drained the rest of the cells in that group. One of the safety features of the charger is that it monitors the 14 cell-group voltages, so the charger does not try to bulk charge the...
by spinningmagnets
Aug 01 2020 11:22am
Forum: Motor Technology
Topic: Understanding QS205 efficiency and power
Replies: 10
Views: 324

Re: Understanding QS205 efficiency and power

Field weakening is useful. Its not a bad feature to have, but even though it uses more watts per minute than when the controller is back in it's designed normal operations profile, that's not a big concern to me since I would only use FW on rare occasions. My biggest concern over FW is that it gener...
by spinningmagnets
Jul 31 2020 8:28pm
Forum: Motor Technology
Topic: Understanding QS205 efficiency and power
Replies: 10
Views: 324

Re: Understanding QS205 efficiency and power

The lower turn count has more copper per turn, and shorter coil-runs. This means a 3T has less resistance than a 5T.

If all other things are equal (same tire diameter, same voltage, etc) is it better to attain "X" speed with a 5T at full throttle, or 3T at a partial throttle?
by spinningmagnets
Jul 30 2020 7:45am
Forum: E-Bike Non-hub Motor Drives
Topic: TSDZ2 Thread organization
Replies: 4
Views: 235

Re: TSDZ2 Thread organization

Also, you can edit your first post to become the index, if you like. Look in the stickied indexes for a useful suggestion about the form.

"Name of thread" (a brief note of description)
[Link to thread]

As Fechter and Ghandi might say "be the change you wish to see"
by spinningmagnets
Jul 29 2020 4:14pm
Forum: Battery Technology
Topic: AC Vs. DC Spot Welding Wire Gauge
Replies: 7
Views: 244

Re: AC Vs. DC Spot Welding Wire Gauge

How many amps does your AC welder put out? and also, what voltage?

Is your AC welder a Sunkko? Which model?
by spinningmagnets
Jul 27 2020 9:47am
Forum: E-Bike Build Threads / Photos & Video
Topic: Custom hardtail commuter
Replies: 10
Views: 469

Re: Custom hardtail commuter

Well done, and thanks for posting this!

I have a Suntour NCX suspension seat post that I like very much. It's not as sophisticated or as capable as a true rear suspension, but...its light and cheap, and it works well enough to make it worth the price...
by spinningmagnets
Jul 26 2020 5:44pm
Forum: Battery Technology
Topic: Something I Don't Get With How a Pulse Welder Works...
Replies: 11
Views: 299

Re: Something I Don't Get With How a Pulse Welder Works...

Here are the stock wires on a north American transformer. The 120V / 15A wires are on the left, and the 2,000V - 1/2A wires are on the right. https://i2.wp.com/www.electricbike.com/wp-content/uploads/2018/12/MOT23.jpg?w=695&ssl=1 Below is a similar transformer. The high-voltage output wires have bee...
by spinningmagnets
Jul 25 2020 5:27pm
Forum: Battery Technology
Topic: Something I Don't Get With How a Pulse Welder Works...
Replies: 11
Views: 299

Re: Something I Don't Get With How a Pulse Welder Works...

The input amps are very low, so thin wires on the input. The output amps on the welder are high, so the output needs thick wires.

The extra amps dont come out of thin air, the voltage is transformed from the input 120V down to 2V on the output. You are trading volts away to get amps.
by spinningmagnets
Jul 25 2020 10:45am
Forum: E-Bike General Discussion
Topic: Why no V-brakes on Fat Bikes?
Replies: 32
Views: 683

Re: Why no V-brakes on Fat Bikes?

Fat bikes were introduced to the public at a time when disc brake components had already been mass-produced and were affordable. The fat rims come in a variety of widths, so nobody wanted to stock a low-volume group of parts when there was no guarantee that fat bikes were not just a fad. If you were...
by spinningmagnets
Jul 25 2020 10:27am
Forum: Battery Technology
Topic: Something I Don't Get With How a Pulse Welder Works...
Replies: 11
Views: 299

Re: Something I Don't Get With How a Pulse Welder Works...

The input is typically 120V AC, and most home outlets have a 15A breaker, which limits common appliances (like a microwave oven) to 1600W. A transformer will "transform" the input watts to a magnetic field, and the steel lamination stack around the primary coil will pull-in and focus the magnetic fi...
by spinningmagnets
Jul 24 2020 11:21am
Forum: E-Bike Build Threads / Photos & Video
Topic: Meet Miss Mino'aka
Replies: 26
Views: 486

Re: Meet Miss Mino'aka

Well done! If you like the hill climbing ability on the stock chainring, this large one will give you the highest top speed on flat ground.

If it sometimes struggles on the steepest grades and you don't mind a slightly lower top speed, a smaller chainring is the best bang for your buck.
by spinningmagnets
Jul 24 2020 11:08am
Forum: E-Bike Technical
Topic: Ultra motor: What is this hub motor? Is it broken? How do i open it?
Replies: 13
Views: 266

Re: Ultra motor: What is this hub motor? Is it broken? How do i open it?

Go to the motor stickies index, look for the motor disassembly pics thread. I think the Stromer and the A2B motors are like this.

viewtopic.php?f=16&t=54935
by spinningmagnets
Jul 23 2020 9:31pm
Forum: E-Bike General Discussion
Topic: Best high current connector
Replies: 33
Views: 968

Re: Best high current connector

You never see a solder-only high current connector in industrial machinery. Crimping is not only much faster and easier to do, it’s also much more reliable Each has their strengths and drawbacks. If you live near salty-air environments, solder and marine heat-shrink can be useful in preventing seve...
by spinningmagnets
Jul 23 2020 12:42pm
Forum: E-Bike General Discussion
Topic: Why fat tires on a street ebike?
Replies: 81
Views: 2002

Re: Why fat tires on a street ebike?

I ride on streets. Typically 20-mph, with an occasional 30-mph to escape a car. My cruiser has 3.5-inch tires using street tread...mid-fat? Coupled with a suspension seat post, I like the ride. I found 4.0-inch tires (or fatter) to be too squishy on turns. If I lived at a sandy beach or in frequent ...
by spinningmagnets
Jul 20 2020 11:22am
Forum: Battery Technology
Topic: Building first battery, need some advice.
Replies: 4
Views: 241

Re: Building first battery, need some advice.

The layout is good. Copper for series, nickel for parallel...
by spinningmagnets
Jul 18 2020 1:10pm
Forum: E-Bike Technical
Topic: Lady needs a little help with battery build
Replies: 14
Views: 411

Re: Lady needs a little help with battery build

This link will give you a good start. At the very least it will provide a common frame of reference for any questions and answers you may have going forward...

https://www.electricbike.com/introducti ... -design-1/
by spinningmagnets
Jul 16 2020 9:35am
Forum: E-Bike General Discussion
Topic: Why are the DaVinci drives used?
Replies: 16
Views: 1833

Re: Why are the DaVinci drives used?

It's a company that uses a cycloidal reduction to have a large RPM reduction in a tiny and light package...
by spinningmagnets
Jul 14 2020 7:42pm
Forum: Battery Technology
Topic: Salvaged EV cells index: Leaf, Volt, Tesla, Zero, etc
Replies: 70
Views: 24292

Mercedes OEM L09-1 EV

https://youtu.be/7PhRhCHQBZI

44V, 12S, 20-Ah, liquid cooling passages, temp sensors, 12V DC/DC converter for automobile accessories.
BatteryMercedes1.jpg
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BatteryMercedes1.jpg (41.24 KiB) Viewed 193 times
by spinningmagnets
Jul 14 2020 11:59am
Forum: E-Bike General Discussion
Topic: Why fat tires on a street ebike?
Replies: 81
Views: 2002

Re: Why fat tires on a street ebike?

I have an Electra Lux Fat 7D with 3.5-inch "mid-fat" tires, using a street tread. When they wear out, I will likely replace them with the same. I dont ride fast, maybe 20-MPH continuous, and 30-MPH to get away from texting drivers. I also don't ride in ice or snow. If I lived in frequent snow or nea...
by spinningmagnets
Jul 14 2020 6:59am
Forum: E-Bike General Discussion
Topic: Just put Statorade in my hub motor... (QS205 related)
Replies: 4
Views: 695

Re: Just put Statorade in my hub motor... (QS205 related)

It will spread out on its own, but you will need 10ml of statorade for each motor to fill the airgap.
by spinningmagnets
Jul 09 2020 12:03pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 7602
Views: 791075

Re: New "TSDZ2 Torque Sensor Central Motor"

This was one of the more interesting discoveries concerning moisture migration on a humid day, where rust would develop inside a hubmotor. As the motor cooled down, humid air would be drawn in through the cable bundle of motor phase wires and hall sensor wires. As the motor cooled even more overnigh...
by spinningmagnets
Jul 09 2020 7:01am
Forum: E-Bike General Discussion
Topic: Back from the dead and Izip Question
Replies: 35
Views: 636

Re: Back from the dead and Izip Question

The early Izips used a 24V brushed controller and battery. If you can verify that this is the most recent 36V version, then many owners of these have successfully upgraded to a 36V 10S battery. The 36V version seems to be adequate on fairly flat land. If your up hills are mild and short, the motor a...
by spinningmagnets
Jul 04 2020 2:47pm
Forum: Battery Technology
Topic: Spot Welder Electrodes Stick Baaad
Replies: 17
Views: 443

Re: Spot Welder Electrodes Stick Baaad

The sticking is because the metal spot-weld connection is getting soft, most likely from heat. If it is the probe tips, you might consider trying probes that are tungsten or possibly half copper/half tungsten. If the nickel is actually nickel-plated steel, that would explain why the same settings ar...
by spinningmagnets
Jul 04 2020 2:41pm
Forum: Motor Technology
Topic: recommended RC-style motors for ebike applications?
Replies: 1
Views: 119

Re: recommended RC-style motors for ebike applications?

RC motors often require significant RPM reduction between the motor shaft and the wheel. Here are a few examples that may narrow the type os systems you want to consider:

https://www.electricbike.com/custom-builds-index/