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### Topic: 3 PWM for 3 phase inventer (Read 34901 times)previous topic - next topic

#15
##### May 08, 2014, 01:47 am

Change your post title to 3-Phase AC motor controller

ok thanks

#### raschemmel

#16
##### May 08, 2014, 02:04 am
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

#17
##### May 08, 2014, 02:32 am
this is my power source

#### raschemmel

#18
##### May 08, 2014, 02:49 am
What's the Peak to Peak voltage at the output ?
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

#19
##### May 08, 2014, 03:04 am

What's the Peak to Peak voltage at the output ?

i don't know

#### raschemmel

#20
##### May 08, 2014, 03:10 am
Why not ?
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

#21
##### May 08, 2014, 03:13 am

Why not ?

oki can you explain me ?

#### raschemmel

#22
##### May 08, 2014, 03:37 amLast Edit: May 08, 2014, 03:45 am by raschemmel Reason: 1
Quote
Example
To illustrate these concepts, consider a 230 V AC mains supply used in many countries around the world. It is so called because its root mean square value is 230 V. This means that the time-averaged power delivered is equivalent to the power delivered by a DC voltage of 230 V. To determine the peak voltage (amplitude), we can rearrange the above equation to:

Vpeak=sqrt{2} x  Vrms

For 230 V AC, the peak voltage (Vpeak) is therefore  230 V  x sqrt{2},  which is about 325 V.

The peak-to-peak value  (V P-P of the 230 V AC is double that, at about 650 V.

http://en.wikipedia.org/wiki/Alternating_current

Are you planning to build this or are just trying to write a program ?
You know if you don't have to use an arduino you can buy a single phase 220vac to 3-phase converter.
Arduino UNOs, Pro-Minis, ATMega328, ATtiny85, LCDs, MCP4162, keypads,<br />DS18B20s,74c922,nRF24L01, RS232, SD card, RC fixed wing, quadcopter

#23
##### May 08, 2014, 10:26 am
i'm trying to write a program

#24
##### May 08, 2014, 01:33 pm
MY problem is i can't varing the frequence with pot(A0)
plz help to fix the code

Code: [Select]
`// disable interrupts to avoid timing distortioncbi (TIMSK0, TOIE0); // disable Timer0 !!! delay() is now not availablesbi (TIMSK2, TOIE2); // enable Timer2 Interruptdfreq = 1000.0; // initial output frequency = 1000.0 Hztword_m = twoTo32 * dfreq / refclk; // calulate DDS new tuning word}//******************************************************************void loop(){if (c4ms > 250) // timer / wait for a full second{c4ms = 0;dfreq = analogRead(POTEN_IN); // read Poti on analog pin 0 to adjust output frequency from 0..1023 Hzcbi (TIMSK2, TOIE2); // disble Timer2 Interrupttword_m = twoTo32 * dfreq / refclk; // calulate DDS new tuning wordsbi (TIMSK2, TOIE2); // enable Timer2 InterruptSerial.print(dfreq);Serial.print(" ");Serial.println(tword_m);}}`

#25
##### May 08, 2014, 04:40 pm
can't anyone help me ?

i have a  projet and i don't have much time

#### MarkT

#26
##### May 08, 2014, 05:58 pm
Well perhaps you could give us the basic facts - the datasheet for the motor and
IGBT 3-phase bridge, the range of frequencies you want, the frequency
resolution, what PWM frequency(s).

As I said if you want a programmable frequency generator then DDS is probably
the way to go - use a timer interrupt to update the DDS and the output phase as
the main control loop.  At its heart DDS is just
Code: [Select]
`volatile long phase = 0L ;volatile long frequency = 0L ;ISR (TIMER2_OVF_vect){  phase += frequency ;  int top_phase = phase >> 24 ;   // truncate to 8 bits  int phase_u = sinetab [0xFF & top_phase] ;  int phase_v= sinetab [0xFF & (top_phase+85)] ;  int phase_w = sinetab [0xFF & (top_phase+171)] ;  ...}`
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

#27
##### May 08, 2014, 06:10 pmLast Edit: May 08, 2014, 06:14 pm by adelo14 Reason: 1
for the motor  ( 220v/380v // f=50hz // rpm = 1430 )

the range of frequencies  is 0 to 2KHZ

#28
##### May 08, 2014, 06:44 pm
can you help to fix it and  can i add the potentiomètre to varing the frequence??

Code: [Select]
`#include "avr/pgmspace.h"#include "avr/io.h"// Look Up table of a single sine period divied up into 256 values. Refer to PWM to sine.xls on how the values was calculatedPROGMEM  prog_uchar sine256[]  = {  127,130,133,136,139,143,146,149,152,155,158,161,164,167,170,173,176,178,181,184,187,190,192,195,198,200,203,205,208,210,212,215,217,219,221,223,225,227,229,231,233,234,236,238,239,240,  242,243,244,245,247,248,249,249,250,251,252,252,253,253,253,254,254,254,254,254,254,254,253,253,253,252,252,251,250,249,249,248,247,245,244,243,242,240,239,238,236,234,233,231,229,227,225,223,  221,219,217,215,212,210,208,205,203,200,198,195,192,190,187,184,181,178,176,173,170,167,164,161,158,155,152,149,146,143,139,136,133,130,127,124,121,118,115,111,108,105,102,99,96,93,90,87,84,81,78,  76,73,70,67,64,62,59,56,54,51,49,46,44,42,39,37,35,33,31,29,27,25,23,21,20,18,16,15,14,12,11,10,9,7,6,5,5,4,3,2,2,1,1,1,0,0,0,0,0,0,0,1,1,1,2,2,3,4,5,5,6,7,9,10,11,12,14,15,16,18,20,21,23,25,27,29,31,  33,35,37,39,42,44,46,49,51,54,56,59,62,64,67,70,73,76,78,81,84,87,90,93,96,99,102,105,108,111,115,118,121,124};    #define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))int phase_u  = 10;int phase_v =  11;int phase_w =  12 ;volatile long phase = 0L ;volatile long frequency = 0L;void setup(){ Serial.begin(115200);pinMode(phase_u , OUTPUT); // PWM output / frequency outputpinMode(phase_v , OUTPUT); // PWM output / frequency outputpinMode(phase_w , OUTPUT); // PWM output / frequency output// Setup the timerssetup_timer1();setup_timer2();// disable interrupts to avoid timing distortioncbi (TIMSK0, TOIE0); // disable Timer0 !!! delay() is now not availablesbi (TIMSK2, TOIE2); // enable Timer2 Interrupt}//******************************************************************// timer1 setup// set prscaler to 1, PWM mode to phase correct PWM, 16000000/512 = 31.25kHz clockvoid setup_timer1(){// Timer1 Clock Prescaler to : 1sbi (TCCR1B, CS10);cbi (TCCR1B, CS11);cbi (TCCR1B, CS12);// Timer0 PWM Mode set to Phase Correct PWMcbi (TCCR1A, COM1A0); // clear Compare Matchsbi (TCCR1A, COM1A1);cbi (TCCR1A, COM1B0); // clear Compare Matchsbi (TCCR1A, COM1B1);sbi (TCCR1A, WGM10); // Mode 1 / Phase Correct PWMcbi (TCCR1A, WGM11);cbi (TCCR1B, WGM12);cbi (TCCR1B, WGM13);}//******************************************************************// timer2 setup// set prscaler to 1, PWM mode to phase correct PWM, 16000000/512 = 31.25kHz clockvoid setup_timer2(){// Timer2 Clock Prescaler to : 1sbi (TCCR2B, CS20);cbi (TCCR2B, CS21);cbi (TCCR2B, CS22);// Timer2 PWM Mode set to Phase Correct PWMcbi (TCCR2A, COM2A0); // clear Compare Matchsbi (TCCR2A, COM2A1);sbi (TCCR2A, WGM20); // Mode 1 / Phase Correct PWMcbi (TCCR2A, WGM21);cbi (TCCR2B, WGM22);}ISR (TIMER2_OVF_vect){  phase += frequency ;  top_phase = phase >> 24 ;   // truncate to 8 bits OCR2A = = sinetab [0xFF & top_phase] ; OCR1A == sinetab [0xFF & (top_phase+85)] ; OCR1B == sinetab [0xFF & (top_phase+171)] ;}`

`#include "avr/pgmspace.h"#include "avr/io.h"// Look Up table of a single sine period divied up into 256 values. Refer to PWM to sine.xls on how the values was calculatedPROGMEM  prog_uchar sine256[]  = {  127,130,133,136,139,143,146,149,152,155,158,161,164,167,170,173,176,178,181,184,187,190,192,195,198,200,203,205,208,210,212,215,217,219,221,223,225,227,229,231,233,234,236,238,239,240,  242,243,244,245,247,248,249,249,250,251,252,252,253,253,253,254,254,254,254,254,254,254,253,253,253,252,252,251,250,249,249,248,247,245,244,243,242,240,239,238,236,234,233,231,229,227,225,223,  221,219,217,215,212,210,208,205,203,200,198,195,192,190,187,184,181,178,176,173,170,167,164,161,158,155,152,149,146,143,139,136,133,130,127,124,121,118,115,111,108,105,102,99,96,93,90,87,84,81,78,  76,73,70,67,64,62,59,56,54,51,49,46,44,42,39,37,35,33,31,29,27,25,23,21,20,18,16,15,14,12,11,10,9,7,6,5,5,4,3,2,2,1,1,1,0,0,0,0,0,0,0,1,1,1,2,2,3,4,5,5,6,7,9,10,11,12,14,15,16,18,20,21,23,25,27,29,31,  33,35,37,39,42,44,46,49,51,54,56,59,62,64,67,70,73,76,78,81,84,87,90,93,96,99,102,105,108,111,115,118,121,124};    #define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))int PWM_OUT_1 =11; // PWM output on pin 11int PWM_OUT_2 =10; // PWM output on pin 10int PWM_OUT_3 =12; // PWM output on pin 9int LED_PIN =13; // LED status on pin 13int TEST_PIN =7; // Scope trigger on pin 7int POTEN_IN =A0; // Potentiometer on pin 0int OFFSET_1 =85; // Offset for second-phaseint OFFSET_2 =170; // Offset for third-phasefloat dfreq;const double refclk = 31376.6; // measuredconst uint64_t twoTo32 = pow(2, 32); // compute value at startup and use as constant// variables used inside interrupt service declared as voilatilevolatile uint8_t icnt; // var inside interruptvolatile uint8_t icnt1; // var inside interruptvolatile uint8_t c4ms; // counter incremented every 4msvolatile uint32_t phase_accum; // pahse accumulatorvolatile uint32_t tword_m; // dds tuning word m//******************************************************************void setup(){pinMode(LED_PIN, OUTPUT); // sets the digital pin as outputSerial.begin(115200); // connect to the serial portSerial.println("DDS Test");pinMode(TEST_PIN, OUTPUT); // sets the digital pin as outputpinMode(PWM_OUT_1, OUTPUT); // PWM output / frequency outputpinMode(PWM_OUT_2, OUTPUT); // PWM output / frequency outputpinMode(PWM_OUT_3, OUTPUT); // PWM output / frequency output// Setup the timerssetup_timer1();setup_timer2();// disable interrupts to avoid timing distortioncbi (TIMSK0, TOIE0); // disable Timer0 !!! delay() is now not availablesbi (TIMSK2, TOIE2); // enable Timer2 Interruptdfreq = 50.0; // initial output frequency = 1000.0 Hztword_m = twoTo32 * dfreq / refclk; // calulate DDS new tuning word}//******************************************************************void loop(){if (c4ms > 250) // timer / wait for a full second{c4ms = 0;dfreq = analogRead(POTEN_IN); // read Poti on analog pin 0 to adjust output frequency from 0..1023 Hzcbi (TIMSK2, TOIE2); // disble Timer2 Interrupttword_m = twoTo32 * dfreq / refclk; // calulate DDS new tuning wordsbi (TIMSK2, TOIE2); // enable Timer2 Interrupt}}//******************************************************************// timer1 setup// set prscaler to 1, PWM mode to phase correct PWM, 16000000/512 = 31.25kHz clockvoid setup_timer1(void){// Timer1 Clock Prescaler to : 1sbi (TCCR1B, CS10);cbi (TCCR1B, CS11);cbi (TCCR1B, CS12);// Timer0 PWM Mode set to Phase Correct PWMcbi (TCCR1A, COM1A0); // clear Compare Matchsbi (TCCR1A, COM1A1);cbi (TCCR1A, COM1B0); // clear Compare Matchsbi (TCCR1A, COM1B1);sbi (TCCR1A, WGM10); // Mode 1 / Phase Correct PWMcbi (TCCR1A, WGM11);cbi (TCCR1B, WGM12);cbi (TCCR1B, WGM13);}//******************************************************************// timer2 setup// set prscaler to 1, PWM mode to phase correct PWM, 16000000/512 = 31.25kHz clockvoid setup_timer2(){// Timer2 Clock Prescaler to : 1sbi (TCCR2B, CS20);cbi (TCCR2B, CS21);cbi (TCCR2B, CS22);// Timer2 PWM Mode set to Phase Correct PWMcbi (TCCR2A, COM2A0); // clear Compare Matchsbi (TCCR2A, COM2A1);sbi (TCCR2A, WGM20); // Mode 1 / Phase Correct PWMcbi (TCCR2A, WGM21);cbi (TCCR2B, WGM22);}//******************************************************************// Timer2 Interrupt Service at 31.25kHz = 32us// this is the timebase REFCLOCK for the DDS generator// FOUT = (M (REFCLK)) / (2 exp 32)// runtime : 8 microseconds ( inclusive push and pop)ISR(TIMER2_OVF_vect){sbi(PORTD, TEST_PIN); // Test / set PORTD,TEST_PIN high to observe timing with a oscopephase_accum += tword_m; // soft DDS, phase accu with 32 bitsicnt = phase_accum >> 24; // use upper 8 bits for phase accu as frequency informationOCR2A = pgm_read_byte_near(sine256 + icnt); // read value fron ROM sine table and send to PWM DACOCR1A = pgm_read_byte_near(sine256 + (uint8_t)(icnt + OFFSET_1));OCR1B = pgm_read_byte_near(sine256 + (uint8_t)(icnt + OFFSET_2));if (icnt1++ == 125) // increment variable c4ms every 4 milliseconds{c4ms++;icnt1 = 0;}cbi(PORTD, TEST_PIN); // reset PORTD,TEST_PIN}`