Recent content by alpine44

Don't forget to take a look at the belt driven alternator starters ( :es: BAS) from some hybrid vehicles out of a junk yard aka car recycler. You can get battery, power stage, and motor from there. All you have left to do is to connect a Lebowski or vesc brain to the power stage (or hack the...

It is relatively easy to change some resistors in the voltage divider that the controller uses for the low voltage cutout. I just modified a 48-72V controller I had laying around to work with a 10s pack. I have another one that I could modify for you.

I am just working on an airplane restoration and bucked a couple hundred rivets last week. The tips that go in the rivet gun are called rivet sets. These go against the factory formed head of the rivet and need to be the right size/shape for domed rivet heads. For flat, countersunk rivets you...

What is the bike/trailer being used for? If you are trying to move a trailer around, an electric version of this may be an option. https://www.youtube.com/watch?v=W7U-X0LlgSE I have two Invacare wheelchair hub motors that would be ideal for this with the appropriate tires.

There was never a chance for a white dude running for the left anyway. The demographic group that is deciding the outcome of the next election are college educated, white women. The rest is going to stand where they stood the last time. I hope that the targets of populist lures thrown in the...

Nice work. A lot of things are switched on and off electronically in today's cars. The button you push just sends a signal to some FET somewhere. I am sure that there is some information out there to show how these circuits are made reliable with different type of loads.

If you take a closer look at the biographies of the richest people in the world, you will see overwhelmingly more 'rags to riches' stories than 'born with the silver spoon' upbringings. That is not a coincidence. These folks were not content with their status quo and they did something about it...

Please stop using Ah to indicate your battery capacity. This is meaningless without knowing your voltage. Wh ("Watt hour" = Ah * Volt) or kWh ("kilo Watt hour" = 1000 Wh) is the correct unit of measure for battery capacity.

This is pretty much what is envisioned by SpaceX to get back from Mars. The reaction of CO2 from Mars' atmosphere with water (also found there) will produce Methane and Oxygen in almost the correct ratio for their rocket engines.

In the following article, they do make a compelling case that Socialism and Democracy are incompatible. Socialism Is Not Democratic The arguments presented in this article are hard to refute in light of the recorded history of Socialism on this planet. How people who complain about over-reach...

For someone who just dabbled around with MOSFETs, even 104V nominal is "high". As you can see in my previous posts, the currents needed to extract maximum (peak) power from the motor at the rated 55.5V is giving me a bit of a headache. Brammo used this motor in their Enertia motorcycle...

I played around with the simulator but every result is fundamentally different than what the manufacturer of the motor published. The attached data are for a motor with different ratings and constants but close enough. When pushed to max torque (solid blue line) the inverter is feeding a...

Axial flux with single rotor between two coil plates. Low resistance, low inductance, and low pole count (4 pairs). PMS-120 from Heinzmann as used in Brammo motocycle. I am not trying to go over 4500 rpm. That's why I was asking what voltage the motor "sees" internally when governed by...

Heat dissipation is an issue regardless of switch type. See numbers in my previous post. From what I can tell, the IGBT come in modules that are physically more suitable for shedding the heat. Albeit at a steep price.

18kW into the motor would require at least 330 A on the DC side. Depending on the PWM duty cycle that will be somewhere North of 450 A phase current. Even in a 24 FET inverter each FET in the active switch would have to carry well over 100 A. I think this is feasible but certainly not in the...