Spwm code

Spwm code


spwm code SPWM IC datasheet, cross reference, circuit and application notes in pdf format. 15 Influence of the inverter on the mechanical vibration of the motor. How to generate 4 SPWM using MSP430g2553? Prodigy 140 points Tahsina Hossain Loba9 Hi, I am trying to generate 4 SPWM Below is my code. Spining BLDC(Gimbal) motors at super slooooooow speeds with Arduino and L6234 Subscribe to the MicroZine Newsletter and collect your free microcontroller Ebooks, download project code and more Email. How to generate a sine wave from arduino or // put your main code here, one more question. In the Code given Below First I am generating a Sine Lookup Table with 200 entries and then Setting up PWM ISR which keeps on updating the Match Value for Match Register 1 after the end of each PWM cycle. This is a snippet of what I have with me , im at work at teh moment. the PIC series uses mainly 8-bit registers that can hold a number form 0-255 decimal. C-code and simultaneously linked to the real inverter hardware. I’m curious as to how one can use spwm and count on this chip, since these commands are not supported by the AT Tiny The SPWM library has an extensive collection of appropriate Breaking the Code; Birth of Modern Geometry; Liberation of Algebra; Mathematical Mystery Tour; N is a The code is not a complete project, it's to show you how to use the motor timer to control an BLDC Motor in combination with an HALL Sensor on another timer. pic simulator ide pic basic compiler Dim duty_spwm As Byte 'duty cycle sine code value register Dim spwmdigit As Byte 'sine code digit register CMCON SPWM generation using PIC16F877A microcontroller code in Mikro c for pic The code produces a SPWM signal and I have already tested the spwm signal which is good just connecting the transformer wont produce a sine wave adding an appropriate filter to the output of the transformer should produce a sine-wave wave form. HIPAA,random Word(s) in meaning: chat "global warming" Postal codes: USA: 81657, Canada: T5A 0A7. SPWM Action Buttons This model demonstrate the basic design and fundamental operation of a single phase SPWM inverter Three Phase SPWM Inverter. Thread 14861: i'm writing a code of a 4 bit pulse width modulator with thefollowing codellibrary ieee; VHDL code of pulse width modulation PWM. Step by step approach is followed so that any hobbyist or design engineer can have a better Inverter arduino code /* based on code by srnka Generating of PWM signals for single phase inverter circuit generating of sine I am trying to generate a spwm signal with the Space Vector Modulation(SVM) Technique 3 level Space Vector ModulationSpace Vector Modulation Comparison between SVM and SPWM SVM We know max possible phase binary image of the eTPU code, PPA, UART, QOM, SM, SPI, SPWM, and test, which are discussed in this application note. Srinivas, (10502055) of 8th semester Electrical Engineering This model is created for three phase SPWM boost rectifier with * Redistributions of source code must retain This model is created for three phase SPWM AC-DC Looking for the definition of SPWM? Find out what is the full meaning of SPWM on Abbreviations. The SPWM technique that was introduced in [6], use 841 of logic elements, fixed carrier frequency and 1 Hz step to I had previously shown how to generate sinusoidal pulse width modulation (SPWM) signals using the ECCP module in a PIC for generating a sine wave output for use in DC-AC inverter. I am also making this project please send me the code of SPWM of arduino as soon as possible. What does SPWM stand for? What does SPWM stand for? Definition of SPWM in the Abbreviations. I m trying to do SPWM Thank u so much ,the code is working properly . Setting up the TIMER0 in fast pwm mode is very easy and just require one line of code. com/Terbytes/Arduino-Atmel-sPWM Second part of this video can be found here: https://www. Introduction Over the past decades, digital sinusoidal fringe pro-jection techniques have been very successful in the fieldof3Dopticalprofilometryandappliedtonumer-ous application areas [1–3]. // put your main code here, to run repeatedly} The result for this program is in the image below: How to generate three phase spwm signal with arduino Performance analysis of modular multilevel converter based on modified flying-capacitor multicell converter using SPWM. Electrical and / Fast Fourier Transform analysis on harmonic content for SPWM design and implementation based ESP32 Arduino: LED PWM fading. Could u jst tell wht is the actual logic behind this in short SPWM using digital I/o. The Pseudo code contains the following steps: 1- Initialize the program variables, Vref lookup-table and STM32F4 PWM tutorial with TIMERs. Download the complete project folder from the below link: ADC and PWM basics on the ATtiny13 27 Feb 2014. Learn to generate PWM signal on 8051 and AVR microcontrollers with sample code in C and assembly language. More When I try to produce SPWM waveform through GPIC, I have two problem. Numerically Controlled Oscillator (NCO) module for designing a Sine Wave Generator. Spining BLDC(Gimbal) motors at super slooooooow speeds with Arduino and L6234 SPWM_PIN_ONTICK_GENERATE(n, arg) SPWM_PIN_ONTICK arg Macro used for code generation for all pins on timer tick. The most important aspect of the Inverter technology is the output waveform. Hi WaiHung, I’ve been trying to implement this code but it was not possible, have you identified any problem on it? Reply. Each of these half signals consumes 10mS of time for 50Hz system. (a) SPWM Signal with Arduino-Simulink (b) SPWM Signal with Arduino-IDE (c) PWM Signal for 1 cycle at 1s with Arduino-Simulink (d) PWM Signal for 1 cycle at 20 ms with Arduino-IDE 49 4. Pulse width modulation’s (PWM) main use is to control the voltage supplied to spwm function code size is: 46 1514131211109876543210 $yfffw0 lastrise channel_control* $yfffw2 nextrise $yfffw4 high_time $yfffw6 period $yfffw8 ref_addr1 In this particular column we tell you about a Arduino SPWM Generator Circuit that may well be compatible with all Arduino enthusiasts SPWM generation using PIC16F877A microcontroller. This calculator will save you from insomnia and headaches ! This page will help you to configure the PIC TIMER2 and PWM modules, you will also get a ready-to-use C source code (for MikroC compiler). These three methods are The following code fragment sets up phase-correct PWM on pins 3 and 11 (Timer 2). Your servo performance will not be affected by other interrupts or computationally heavy programs. IbrahimLabs: PWM generation using PIC24, DsPIC33, DsPIC30 or based technique (e. com SPWM is absolutely mostly adopted to realize high precision control. You will not be able to change it for each cycle, but maybe for every 10 cycles. The waveform generation mode bits WGM are set to to 001 for phase-correct PWM. The SPWM library has an extensive collection of appropriate Breaking the Code; Birth of Modern Geometry; Liberation of Algebra; Mathematical Mystery Tour; N is a DSP Based Real Time implementation of AC-DC-AC converter Using SPWM Technique Umashankar S 1, Mandar Bhalekar 1, Surabhi Chandra 1, Vijayakumar D 1 The code is not a complete project, it's to show you how to use the motor timer to control an BLDC Motor in combination with an HALL Sensor on another timer. FYI, the square wave is running on 50 Hz freq and the filtered SPWM is producing 100 Hz. For more information about how to write code for SPWM using PIC16F877A microcontroller and how to use SPWM for hi guys. Pulse Width Modulation following C code, Arduino Due controller in which i have to generate SPWM signals. The output of this code is SIMULATION AND COMPARISON OF SPWM AND SVPWM CONTROL FOR THREE PHASE INVERTER ON. More SPWM_simulink Matlab/Simulink simulation curriculum design (thesis) paper SPWM voltage source inverter modulation simulation. Timers In Compare Mode Part I; Timers In Compare Mode Part II; Setting Up TIMER0 in Fast PWM mode. The NCO module uses the DDS technique for generating waveforms, What does SPWM stand for? Definition of SPWM in the Abbreviations. The video includes the components needed and an easy to follow connection guide, as well as a demo of the results obtained. 1Hz step for AC motor control Arduino output SPWM using Matlab. For bus data code 0, code 1, and code 2 are When you put everything in an interrupt code - the whole thing can get huge as in big code systems you have to do alot of different interrupts to service. 5- If the output voltage is equal to V reference then returns step 2. I know to create single sine wave using arduino I have to create look up table with PWM values. It seems that all the code you wrote is in Matlab, and at each cycle it should communicate via the USB port with arduino to turn LPC1768 PWM Module. PWM waveform (CH1), DAC output (CH2), Phase Voltage AB (line-line) (CH3) and Current waveform (CH4) for Phase A of IM 51 4. Pseudo code contains the following steps: 1- Initialize the variables and all peripheral microcontrollers. PERFORMANCE ANALYSIS OF SPWM INVERTER FED 3-PHASE INDUCTION MOTOR DRIVE USING MATLAB/SIMULINK Nitin Goel1, P. sch can somebody help me with the look up table ? I wanna make a look up table (SPWM) using code vision compiler (c), does anyone know ? (please give ma a hint) MATLAB/Simulink Implementation and Analysis of Three Pulse-Width-Modulation (PWM the sinusoidal PWM(SPWM represented as binary codes that correspond to So what we want is that stable 1. AN564 DS00564B-page 2 Code Size: 52 Words RAM used: 11 Bytes Interrupt Service Routine time 3. Introduction In recent years, dsPIC has to be executed in Code Composer and MPLAB Code: volatile int brightness = 0; //initializing a integer for incrementing and decrementing duty ratio. 2khz ? Performance analysis of modular multilevel converter based on modified flying-capacitor multicell converter using SPWM. The STM32 PWM_1 example program shows how to configure and use the timer TIM4 of STMicroelectronics STM32F103xx microcontroller to generate pulse-width modulation. But i cant figure out why it aint working!!!! its driving me crazyyyyyyyyyyyyyy. Generate Code When ANALYSIS OF SINGLE PHASE SPWM INVERTER Sakshi Kulshreshta1, Deepti Rana2, Shubhangi Sharma3 1, 2 ,3 Students, Electrical Engineering Department Greater Noida Hello sir. analysis of single -phase spwm inverter a thesis submitted in partial fulfillment of the requirements for the degree of bachelor of technology Small step by step guide on how to use the PWM (Pulse Width Modulation) of the Arduino board. I want to write code for SPWM as described on following website Pure sine wave inverter. Dependencies: mbed Fork of SPWM [Simple] Generating Pulse Width Modulation using PIC Microcontroller Before writing the program we should add PWM library functions to our code. This code was based on Swagatam SPWM code with changes made to remove errors. In the intermediate DC circuit, the There are five advantages, really: 1. Read about 'Sine PWM generation using Arduino UNO' on Therefore, I need to generate a SPWM The code you posted just uses a look up table to make Code and documentation can be found here: https://github. h the SPWMTIMEBASE for the desired timebase of the generated signal. The below sample code shows how to use the ExploreEmbedded PWM library. com/Terbytes/Arduino-Atmel-sPWM First part of this video is here: https: for SPWM the duty cycle has to be changed frequently. In an SPWM implementation that is realised with the circuit shown in Figure 14, it is expected to generate a three-phase sinusoidal voltage for the pure inductive load. Pulse Width Modulation (PWM) Here is a sample ATmega8 code to setup TIMER 1 for a 4KHz, 10bit, Phase Corrected PWM at 16MHz Clock: #include int main Implementation of Space Vector Pulse Width DSP, dsPIC, SPWM, SVPWM. The National Instruments Getting Started with NI-DAQmx Series is aimed at helping you learn NI-DAQmx programming fundamentals. how to Generate PWM using Atmega32 can somebody guide me from where to start and how to proeceed in writing code for That is how usually SPWM is vsi3 spwm. For each pin you must define SPWM_PINn where n is SPWM number. but I don't know how to create three phase SPWM using Arduino. GitHub is home to over 28 million developers working together to host and review code, manage projects, and build software together. 1 * Redistributions of source code must retain the above SPWM technique for Three Phase Modulation based on Digital Signal Processing Technique . Third stage is a output stage which is constructed by using center. enter the ship to code for which this contact is valid in the Ship To Code field. 5 = 60 instructions that can be executed before another interrupt fires (and that includes the ISR code as well. * Redistributions of source code must retain the above 3p inverter inverter spwm inverter three Design , Implementation and Testing of SPWM Inverter on dSPACE Platform . utility efficiency of DCside voltage than the sine pulse width modulation- (SPWM). The following code fragment sets up phase-correct PWM on pins 3 and 11 (Timer 2), using OCR2A as the top value for the timer. SPWM is the most common method in motor control and inverter application. Full-Text Paper (PDF): FPGA implementation of Unipolar SPWM for single phase inverter Microcontroller Based SPWM Generator: A Conventional Design Perspective Through Graphical Oriented Approach program was written by using delay code under inverter SPWM signal. Try it out yourself, enjoy! :D analysis of single -phase spwm inverter a thesis submitted in partial fulfillment of the requirements for the degree of bachelor of technology Pulse width modulation tutorial for motor speed control and voltage control. net Technical guide – Induction motors fed by PWM frequency inverters 3 6. Design and Implementation of the firing circuit of a SPWM Inverter using microcontroller Submitted by Sandeep Behera Roll no. 710EE2068 For the award of the degree of sine wave inverter circuit diagram using microcontroller, Arduino and program code, SPWM using pic16f877a microcontroller, Full-Text Paper (PDF): FPGA implementation of Unipolar SPWM for single phase inverter niques: the sinusoidal PWM (SPWM) technique, the third-harmonic-injection PWM (THIPWM) technique, and the space-vector PWM (SVPWM) technique. This switching function S corresponds to one phase and for three phase it is given in figure 5. To code these eight states in binary (one-zero representation), niques: the sinusoidal PWM (SPWM) technique, the third-harmonic-injection PWM (THIPWM) technique, and the space-vector PWM (SVPWM) technique. The most difficult factor is calculating the duty cycles for each power switch, as well as determin the vector sector and pulse ing sequence in each switching cycle. I am working on my project related to hyprid pure sine wave inverter using pic microcontroller. You can download the full source code of this sample here: PWMDemo. How it Works? To design an Inverter, many power circuit topologies and voltage control methods are used. Conventionally, to generate the signal, triangle wave as a carrier signal is compared with the sinusoidal wave, whose frequency is the desired frequency. Analysis fundamental improvement with respect to modulation index variation is done in simulation. Unipolar SPWM modulation single-phase, single-phase bipolar SPWM modulation, three-phase bipol SPWM - System Contacts Maintenance. To filter the waveform (Square wave, quasi sine wave or Sine wave) capacitors and inductors are used. This application note should be read in conjunction with SPWM Master Channel CCP which stands for Capture, Compare and Pulse width modulation while ECCP stands for Enhanced Capture, Compare and Pulse width modulation. But the author did not provide the code and I am trying to write my code. Here you will find our home made pure sine wave power inverter based on SPWM EG8010. SPWM (Sine–triangle pulse width modulation) Pulse-amplitude modulation; Pulse-code modulation; Pulse-density modulation; Pulse-position modulation; Radio Hello I wanna generate spwm signal using arduino but I can't set the frequncy of the carrier "triangle signale " and the sine wave which are compared to each other using Arduino mega the image illustrates what i wanna do and code are attached thanks in advance http://obrazki. :) SPWM control: that is to control In the 3-phase PWM power inverter circuit, the ratio of the carrier frequency fc and the modulated signal fr called the carrier Arduino Power Inverter Circuits. 1 Sinusoidal Pulse Width Modulation (SPWM) With Variable Carrier Synchronization for Multilevel Inverter Controllers M. Simulink provides a graphical editor, customizable block libraries, and solvers 106 thoughts on “ PWM Signal Generation by Using AVR We have already made a code for this problem and also checked it. These three methods are This project is used to analyze the performance of AC motor using sinusoidal pulse width modulation SPWM or sine pulse width modulation is a Security code Arduino output SPWM using Matlab. 5% over SPWM SPACE VECTOR PULSE WIDTH MODULATION This method is found in Texas Instruments’s reference code for keeps one of the SPWM IC datasheet, cross reference, circuit and application notes in pdf format. Videos for this project: Arduino power inverter new version: Below has differing code from the above. Due to high carrier frequency which represents the switching function S. The SPWM technique that was introduced in [6], use 841 of logic elements, fixed carrier frequency and 1 Hz step to Meaning of SPWM. This means that digital systems such as programmable logic controllers, computers, microcontrollers, or a well-design Users » riggus » Code » FRDM-KL46Z-SPWM_THPWM. SPWM comparison Signals (top) and PWM signal output (bottom) There are several ways of producing SPWM signal, the method mainly consists of modulation or with the introduction of dedicated microcontroller [1, 3, 5-8]; which is producing greater accuracy than analogue circuits [7]. AC The Enhanced Pulse Width Modulator (ePWM) module described in this reference guide is a Type 0 ePWM. Working with Atmel AVR Microcontroller Basic Pulse Width Modulation (PWM) Peripheral April 30, 2011 by rwb, under Microcontroller. 710EE2068 For the award of the degree of sine wave inverter circuit diagram using microcontroller, Arduino and program code, SPWM using pic16f877a microcontroller, I am a final year student of electrical engineering. 65 V over on the far left, and what we don’t want is that troublesome spike at 100 kHz (as well as all the higher-frequency spikes). This site uses cookies to store information on your computer. The SPWM in Matlab Could anyone please tell me what is the comments given in the matlab code? Posted by tojeena in forum: General Electronics Chat. The waveform generation mode bits WGM are set to to 101 for phase-correct PWM with OCRA controlling the top limit. sch), in Linking External C/C++ Code via DLL: Arduino Sine wave Generator using the direct digital synthesis Method Here we describe how to generate sine waves with an Arduino board in a very accurate way. It seems that all the code you wrote is in Matlab, and at each cycle it should communicate via the USB port with arduino to turn Using STM32 timers in PWM mode April 22, 2014 arm, pwm, stm32, timers. arduino control 3 phase inverter i found this code but i have some problems with output frequence can you help me to fix the code for my arduino mega 2560 and thx. SPWM is an essential modulation algorithm in power electronic the code effectively. The SPWM process is explained in figure 4(a) and the corresponding switching function is shown in figure 4(b). 3 Generation of SPWM using The value of ‘Delta_Phase’ determines how fast the code moves through the Look at this code that will setup the internal clock in the template. You could start by calculating a sinus on the arduino using an interrupt that is set for maybe every 2 milliseconds. Paper Code: 14470-IJEE Simulation of Five-Level Inverter with Sinusoidal PWM SPWM a table consisting of values of sine waveform sampled at certain frequency is supports simulation, automatic code generation, and continuous test and verification. If this pin is the same as the TX pin the code for the single pin UART implementation is compiled. The aim of this repo is to help the hobbyist or student make rapid progress in implementing an sPWM signal on a arduino or atmel micro, while making sure that the theory behind the sPWM and the code itself is understood. All PWM code bit are complemented when passed through gate drive circuit. spwm Search and download spwm open source project / source codes from CodeForge. Generate Code When Symmetric PWM (SPWM) uses a control number n to turn a pulse on n counts before a datum time, Is the matrix centrosymmetric and so is the code? To access the Code Examples integrated with PSoC Designer, This application note introduces PSoC1 glitch free three-phase sine wave generator. Pulse Width Modulation (PWM) is a technique widely used in modern switching circuit to control the amount of power given to the electrical device. PWM Pulse Width Modulation is a technique used to generate analog signals from digital signals. ST7FMC Microcontroller with a three-phase bridge 1 MOTOR CONTROL MACROCELL INTRODUCTION How to generate a sine wave from arduino or // put your main code here, one more question. See the TMS320x28xx, 28xxx DSP Peripheral Reference Guide (SPRU566) for a list of all devices with a ePWM module of the same type, to determine the differences between the types, and for a list of device-specificdifferences within a type. Although the SVPWM has many advantages, it is difficult toimplement. Disadvantages: You can only control a limited number of servos per timer. Figure 5 Analog Scheme for SPWM Implementation The method utilizing the natural intersection Join GitHub today. PWM code at the port2 at regular time instances provided by timer. In this example if a 16F88 is used with a 8MHz internal oscillator that means 0. 3/39 PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC Figure 1. com! 'Sinusoidal Pulse Width Modulation' is one option -- get in to view more @ The Web's largest and most authoritative acronyms and abbreviations resource. However, they still en-counter challenges due to the speed limitation as well as the nonlinear gamma effect. Download the complete project folder from the below link: How do I generate three SPWM waves using How do I generate a 50% dutycycle output wave in 8051 using C code I presume you're designing a three phase SPWM SPWM V/Hz inverter - Download as Word Doc 2. At this point you can probably see why we use a low-pass filter in a PWM DAC: the filter retains the DC component while suppressing everything else. So if we wish to generate a sine wave of 50Hz, we need to do a full SPWM cycle in between this 10mS. It seems that all the code you wrote is in Matlab, and at each cycle it should communicate via the USB port with arduino to turn The following code fragment sets up phase-correct PWM on pins 3 and 11 (Timer 2). My problem is, when running the program after a few minutes, the square waves generated start to shifted from the filtered SPWM. In this type of drive, a diode bridge rectifier provides the intermediate DC circuit voltage. in SPWM theory there is an index called amplitude modulations Either way, the tone() function returns quickly and your code continues to run while the pin outputs the specified frequency. The current controller can be SPWM or hysteresis current controller. AN2863SW is available for download at National Institute of Technology Rourkela, Orissa-769008 Certificate This is to certify that Mr. Usect Implementation of QALU based SPWM controller through FPGA Sinusoidal PWM is practically used in three phase power conversion Pseudo code for QALU based SPWM. Arduino Inverter Circuit, arduino inverter code, arduino inverter spwm, dc to ac arduino, sine wave inverter using arduino uno, single phase inverter using arduino Share on Tumblr Inverter circuits are very helpful to produce AC supply when we need and it uses minimum level of DC bias from battery source. In SPWM technique the This model is created for three phase SPWM boost rectifier with * Redistributions of source code must retain This model is created for three phase SPWM AC-DC /* based on code by srnka Generating of PWM signals for single phase inverter circuit generating of sine I am trying to generate a spwm signal with the 0. IRMCK203 Application Developer’s Guide This document is the property of International Rectifier and may not be IRMCK203 Application Developer’s Guide inverter capacity is 15. This project for sine wave generation using PWM with PIC microcontroller is described with the help of circuit diagram and source code. A tested hardware is also available with For each pin you must define SPWM_PINn where n is SPWM number. Dependencies: mbed Fork of SPWM I am trying to implement the SPWM How to implement Sine PWM using Tiva motor driver using SPWM and SVPWM modulation // Part of code used from http ANALYSIS OF SINGLE PHASE SPWM INVERTER Sakshi Kulshreshta1, Deepti Rana2, Shubhangi Sharma3 1, 2 ,3 Students, Electrical Engineering Department Greater Noida CARRIER BASED SPWM TECHNIQUES FOR SINGLLE PHASE MULTILEVEL INVERTER USING FPGA FOR The code is verified using HDL Co-Simulator plots and mapped onto FPGA. I want to use an ATtiny13 to control the brightness of an LED light source Code from this article on Gist; SPWM AND THPWM . CCP which stands for Capture, Compare and Pulse width modulation while ECCP stands for Enhanced Capture, Compare and Pulse width modulation. in SPWM theory there is an index called amplitude modulations SPWM_PIN_ONTICK_GENERATE(n, arg) SPWM_PIN_ONTICK arg Macro used for code generation for all pins on timer tick. speed control of BLDC motor by svpwm inverter fed using PI controller or other controller pic simulator ide pic basic compiler Dim duty_spwm As Byte 'duty cycle sine code value register Dim spwmdigit As Byte 'sine code digit register CMCON SPWM generation using PIC16F877A microcontroller code in Mikro c for pic SVPWM or space vector pwm is a more sophisticated technique for generating a fundamental sinewave with higher voltage and lower harmonic distortion for motors. jpg SPWM explanation of the procedures used to achieve TMS320LF2407 three-phase waveform generator FCL. com/Terbytes/Arduino-Atmel-sPWM First part of this video is here: https: I mean what is conventional method to convert SPWM to sine wave Hello every one if some one wants complete hardware and code of working of 100w sine Pulse Width Modulation Using an Arduino Travis Meade 11/14/2014 Figure 2 has code that changes the duty cycle while it is running. This code was based on BARUTI SPWM code with changes made to remove errors. I use PFGA FXPT triangle Generation model (inside SCTL) to produce triangle waveform and check the waveform through AO1 on GPIC. Sharma2, Suman Bala3 123Electrical Engineering I want to write code for three phase sine wave inverter using Arduino. Sinusoidal PWM for Three Phase Inverter (SPWM Inverter) version 1. void setup() I m trying to do SPWM Thank u so much ,the code is working properly . Sharma2, Suman Bala3 123Electrical Engineering Simpler code once you set all the registers correctly. Hi i am trying to debug a code in MPC5777C so during debug the code stuck at particular line and showing an error like this Program received signal 1 definitions of SPWM. You can control a traditionally analog load using a digital signal and a switching element. , sinusoidal pulse width modulation, SPWM), the space-vector (SV) technique, and the selective-harmonic- elimination (SHE) technique. spwm code

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