[mr2]

Originally Posted by DavidDymaxion

Well, you could run the switches in a linear mode to get perfect sine waves. However they'll get hot and will need to be grossly oversized. Full on (low resistance) and full off (very high resistance) are low heating states for silicon switches, but 1/2 gives resistance that heats them up.

You could also do a scheme with many batteries, and switch the voltage up and down via various combos of batteries. It's going to be a challenge to keep the batteries balanced, but at least you can have your voltage jumps as 2 or 3 Volt steps rather than 0 to full pack voltage.

A typical system has inductance and capacitance, this tends to smooth the PWM waves.

Something you might want to look at is switched reluctance. You just switch them coarsely, not the fine fast switching of typical PWM. The shape of the poles helps give you some sine-like behavior.

It is not done in any of those ways. I have a power source, my invention, the switching and then the motor. Nothing more, nothing less. The perfect sine is selfachieved. Should not be there, but it sure happens. No spikes at all when switching on-off. No BEMF.

I am just looking for a hex-file for ATMEGA processor without PWM and any normal sensing (Hall or EMF) from typical 3 phase BLDC motors.

[Qer]

Originally Posted by mr2

But I am tested at Mensa, using 10 minutes to answer the 45 questions and when deliver the formular, asking them if they couldn't do better.. Max score 145.

Originally Posted by mr2

No BEMF.

You know, even if you spiked the Mensa-test it doesn't give you the rights to break the laws of physics.

[Salty9]

Assembly programming is tedious but not really difficult.

[mr2]

Originally Posted by Qer

You know, even if you spiked the Mensa-test it doesn't give you the rights to break the laws of physics.

No, and I don't.

But it is not the question why and how it works or not, but if anyone know how or can help me out with a hex-file without PWM and trigging by sensing either by Hall or EMF.

Just the switching like BLDC 3 phase motors by a frequency set in a variable.


I made these lines in C

#include<avr/io.h>
#include<util/delay.h>

int main()
{
unsigned char i;
DDRA = 0xFF; // all a-ports as output

while(1)
{
for(i=0;i<6;i++)
{
PORTA=0; // open all outputs that gives break before make

// _delay_ms(1); (optional delay 1 ms before make)

switch(i){
case 0:
PORTA=162; // step 1
break;
case 1:
PORTA=97; // step 2
break;
case 2:
PORTA=145; // step 3
break;
case 3:
PORTA=84; // step 4
break;
case 4:
PORTA=140; // step 5
break;
case 5:
PORTA=74; // step 6
break;
}
_delay_ms(150); // length of pulse
}
}
return(1);
}



Would this work?


Maybe use 1 b port as input for sensing if the motor is running...

[ElectriCar]

How's it coming Mr2? Been a few weeks now.

[alexcrouse]

Originally Posted by mr2

No, the motor that has been tested is only 1 phase. http://www.torin-sifan.com/display.asp?product=131

That's a DC motor....

[ElectriCar]

Are saying single phase is DC? If so you're incorrect. 120V motors are single phase as are 208V and 480V motors that have only TWO WIRES. That's single phase. There also is no such thing as two phase. It's either single phase or three phase and of course there's DC.

[alexcrouse]

Originally Posted by ElectriCar

Are saying single phase is DC? If so you're incorrect. 120V motors are single phase as are 208V and 480V motors that have only TWO WIRES. That's single phase. There also is no such thing as two phase. It's either single phase or three phase and of course there's DC.

That motor is listed on their website as DC, PWM control.

[DavidDymaxion]

Actually there are 2 phase motors. The second phase is driven by a capacitor, causes a delay for that phase, just to get the motor started. Then it is primarily a single phase motor once running.

You wouldn't do a 2 phase motor in an EV because it would take 8 switches. Doing 3 phases takes just 6, because you can hook the field coils together in a star or delta arrangement. There might be some esoteric math thing with the phases, too, any comments on that Major?

Originally Posted by ElectriCar

Are saying single phase is DC? If so you're incorrect. 120V motors are single phase as are 208V and 480V motors that have only TWO WIRES. That's single phase. There also is no such thing as two phase. It's either single phase or three phase and of course there's DC.

[alexcrouse]

Originally Posted by DavidDymaxion

Actually there are 2 phase motors. The second phase is driven by a capacitor, causes a delay for that phase, just to get the motor started. Then it is primarily a single phase motor once running.

You wouldn't do a 2 phase motor in an EV because it would take 8 switches. Doing 3 phases takes just 6, because you can hook the field coils together in a star or delta arrangement. There might be some esoteric math thing with the phases, too, any comments on that Major?

Correct.

To All:
But as i said, that motor is a 24v DC according to the manufacturer. I know more about motors than most people, and i am NOT saying that DC = Single Phase, just to clarify. That motor is DC, NOT Single Phase. At least that's what the maker says.