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1  Using Arduino / Motors, Mechanics, and Power / Re: Induction Motor Control! on: January 31, 2013, 12:51:53 pm
all MY induction motors have RPM sensors for feedback (I specified this in case they were needed). I'm aware that not ALL do.

The end goal is to have nothing in DC (other than perhaps the arduino signals... if they need to be?). That is, if I mechanically spin an excited induction generator/motor, I should be able to form 3-phase power out. This 3-phase power should power an induction motor, no? I should be able to control speed and torque by modulating the frequency of the signal, no?

Very simply, I'm building a flywheel and motor pair. spin the flywheel up (using household AC power), send power from the flywheel to the motor, and then back again. Control the speed of the motor with frequency modulation (I assume). Is there an elegant solution for this?

2  Using Arduino / Motors, Mechanics, and Power / Re: Do I need a fly back diode for a relay controlled solenoid on: January 30, 2013, 06:35:28 pm
do it. I work for an electric car company, and they decided to not implement a diode across a relay/microswitch system, and the switches will fail after about a year. with a Panasonic part that has a built-in diode, there have been no issues.
3  Using Arduino / Motors, Mechanics, and Power / Re: Induction Motor Control! on: January 30, 2013, 06:32:43 pm
Thanks retro; there's a good chance that if I'm an engineer, I've read the brief wikipedia page on induction generators. I'm more curious about how to build the power electronics, and if anyone has schematics/diagrams of proper controllers.
4  Using Arduino / Motors, Mechanics, and Power / Re: Induction Motor Control! on: January 29, 2013, 10:39:17 pm
sorry yes, 3-phase induction.

5  Using Arduino / Motors, Mechanics, and Power / Induction Motor Control! on: January 28, 2013, 10:32:10 pm
Greetings earthlings,

I'm a newbie here, so I'll give you a bit of who I am, and what I'm doing. I graduated from mechanical engineering in 2008, which means the electronics course I took in university was a good 8-ish years ago. With all the other stuff I was studying, it's all quite foggy in my brain now. I'm not tremendously strong in the electrical department, but I make up for that in curiousity and research. What makes my journey easiest, is having a good, simple source of information. I'd like to learn some essential induction motor control - I have spent the last few weeks (and months previous) studying a good portion of the material on this forum, other sources, youtube (I like to SEE it), wikipedia, and I'm soon to plow through my old electronics text to see if I can get it sorted. But I need a helping hand (and hopefully won't get a "SEARCH NEWB!" response). I purchased a Mega a few days ago.

The plan is simple; to send power to and from induction motors (all induction motors have hall effect RPM sensors). I can start with BLDC, but the eventual project will be induction.

Phase 1: I'd like to be able to initially power an induction motor
Phase 2: then I'd like to supply mechanical power to the induction motor, and charge, say, a battery bank.
Phase 3: Thirdly, I'd like to swap power between two induction motors - swapping electrical for mechanical power and back again. That is, crank one with mechanical power, and have the other spin and vise versa.

logically, I'd say that phase 2 and 3 should come very quickly on the heels of a successful Phase 1.

My number one criteria is efficiency.

Any good resources or pointers?

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