Recent content by Leeps

The way i usually do it is: First melt solder with the iron and suck up the bulk of it with the solder sucker. Then use the solder braid to get anything left behind. I pinch the braid between the board and soldering iron and sort of wipe it around like a mop. Your mileage may vary, just do what...

I really really would like to build a motor controller with an imbedded microcontroller, i have a ton of pics lying around with a compiler and programmer ready to go. I just dont trust my programming skills when it comes to something that could end up killing me. "Hmm the throttle doesnt...

well yeah from my perspective that is what im talking about. pwm effect isnt a real term that your going to find in a glossary, i assumed that this is what you were talking about, being that it is the cause for the curved torque curve that upset you oh so many months ago. And the thing thats...

Safe your typical torque curve could also be a motor controller with no current limit and somebody holding full throttle. At this point your just not listening, i guess its nice to know that v=di/dt but it also requires visualizing what all those letters mean to understand the system...

I dont really follow on this. E1 is chopped. E2 ideally should be straight dc but there is some ripple voltage due to ripple current. The output filter capacitor ( left out on motor controllers) filters out the ripple voltage. I dont really see unaccounted for energy in an ac component. use my...

Okay first thing. By pwm effect do you mean the fact that input and output current dont match, or are you talking about the fact that your torque curve isnt flat. These are two very very different things, and neither have much to do with discontinous vs continuous operation. continuous...

Safe for the love of god please trust us, i promise we are not attempting to mislead you. The pwm effect, if you are talking about a difference between input and output current occurs ANYTIME the duty cycle is less than 100%. Let me explain it in non mathematical laymens terms. Think of...

Well if you have a high backemf motor then you just have a high voltage motor. No more no less. Typically high backemf translates into high torque per amp low speed per volt, low backemf is the inverse. It doesnt really dictate power. edit: theres more to it than that. look at axial flux...

I would say you pretty much got it. If the load is the same then thats all there is to it when your cruising. The only benefit i see as far as motor heating goes, and the math has to be done to see if there is a benefit, is to raise voltage and raise the gear ratio at the same time. This way...

The difference is in that with the resistor, the impedance is coming from resistance, thus you pretty much all loss. loss does equal heat. however with the magnetic ballast you do have impedance but a lot less actual resistance. An impedance can be looked at as an apparant resistance, for...

Yes it does, core loss from hysteresis :lol: edit: i want trying to say his equation was right Joe

Well im getting in late on this converation. My opinion on gears is that they cant hurt they can only help. They give you more torque to the wheels with less power required from the motor. It is in effect the torque output of the motor that leads to loss and motor heating at any given speed...

A light bulb really is a power resistor that gets so hot it glows when you look at it. They get hot, very hot, it still needs to be delt with. The high temperature is a plus and minus at the same time. Being that they run hot normally you dont have to heat sink it, theres a huge temperature...

A halogen light bulb should make a pretty good load. Two or three 500 watt bulbs can take all the power your setup can dish out. A 300 watt bulb is good for smaller setups. I'm not sure how badly resistance changes as they warm up, but a voltmeter and ammeter will give you all the information...

speed controller? Joe