What it the meaning of V/F and PMW technique? kindly break down the steps involved in actualization of the project.

VF Control of 3-Phase Induction Motors Using PIC16F7X7 Microcontrollers
An induction motor can run only at its rated speed when
it is connected directly to the main supply.But many applications need variable speed operations. the
motor user can replace an energy inefficient mechanical
motor drive and control system with a Variable
Frequency Drive (VFD).the most popular control technique
is by generating variable frequency supply, which
has constant voltage to frequency ratio. This technique
is popularly known as VF control.

The PIC16F7X7 series of microcontrollers have three
on-chip hardware PWM modules, making them
suitable for 3-phase motor control applications.

VF CONTROL:
The base speed of the induction motor is directly
proportional to the supply frequency and the number of
poles of the motor.by varying the supply frequency , we can vary the vary the speed of the induction motor.

MOTOR DRIVE:
The 3-phase induction motor is connected to a 3-phase
inverter bridge. The power inverter
has 6 switches that are controlled in order to generate
3-phase AC output from the DC bus. These switches are controlled by the PWM signals,
generated from the microcontroller. The amplitude of phase voltage is determined by the
duty cycle of the PWM signals. Three of the six switches will be on at any time. The switching produces
a rectangular shaped output waveform that is rich in harmonics. A 3-phase sine wave with negligible harmonics is produced from this by the filtering effect of the motor's windings. freewheeling diodes are provided to facilitate the dissipation of energy stored in the windings.


For more details, refer this pdf:

I want to get a hint about the sub of controlling of 3-phase I.M through pc

This article is presented by:Jaroslav Lepka
Petr Stekl

3-Phase AC Induction Motor
Vector Control Using a
56F80x, 56F8100 or
56F8300 Device

Introduction
This application note describes the design of a 3-phase AC Induction Motor (ACIM) vector control drive with position encoder coupled to the motor shaft. It is based on Freescale’s 56F80x and 56F8300 dedicated motor control devices. The software design takes advantage of Processor ExpertTM (PE) software. AC induction motors, which contain a cage, are very popular in variable-speed drives. They are simple, rugged, inexpensive and available at all power ratings. Progress in the field of power electronics and microelectronics enables the application of induction motors for high-performance drives, where traditionally only DC motors were applied. Thanks to sophisticated control methods, AC induction drives offer the same control capabilities as high performance four-quadrant DC drives. This drive application allows vector control of the AC induction motor running in a closed-speed loop with the speed / position sensor coupled to the shaft. The application serves as an example of AC induction vector control drive design using a Freescale hybrid controller with PE support. It also illustrates the use of dedicated motor control libraries that are included in PE. This application note includes a description of Freescale hybrid controller features, basic AC induction motor theory, the system design concept, hardware implementation and software design, including the PC master software visualization tool.
Advantages and Features of Freescale’s Hybrid Controller
The Freescale 56F80x (56800 core) and 56F8300 (56800E core) families are well-suited for digital motor
control, combining the DSP’s calculation capability with an MCU’s controller features on a single chip. These
hybrid controllers offer many dedicated peripherals, including a Pulse Width Modulation (PWM) unit, an
Analog-to-Digital Converter (ADC), timers, communication peripherals (SCI, SPI, CAN), on-board Flash and
RAM. Generally, all the family members are appropriate for use in AC induction motor control.
The following sections use a specific device to describe the family’s features.
56F805, 56800 Core Family
The 56F805 provides the following peripheral blocks:
• Two Pulse Width Modulator units (PWMA and PWMB), each with six PWM outputs, three Current
Sense inputs, and four Fault inputs, fault-tolerant design with dead time insertion; supports both
center-aligned and edge-aligned modes
• 12-bit Analog-to-Digital Converters (ADCs), supporting two simultaneous conversions with dual
4-pin multiplexed inputs; ADC can be synchronized by PWM modules
• Two Quadrature Decoders (Quad Dec0 and Quad Dec1), each with four inputs, or two additional Quad
Timers, A & B
• Two dedicated general purpose Quad Timers, totalling six pins: Timer C, with two pins and Timer D,
with four pins
• CAN 2.0 B-compatible module with 2-pin ports used to transmit and receive
• Two Serial Communication Interfaces (SCI0 and SCI1), each with two pins, or four additional GPIO
lines
• Serial Peripheral Interface (SPI), with a configurable 4-pin port (or four additional GPIO lines)
• Computer Operating Properly (COP) / Watchdog timer
• Two dedicated external interrupt pins
• 14 dedicated General Purpose I/O (GPIO) pins, 18 multiplexed GPIO pins
• External reset pin for hardware reset
• JTAG / On-Chip Emulation (OnCE) for unobtrusive, processor speed-independent debugging
• Software-programmable, Phase Lock Loop-based frequency synthesizer for the hybrid controller core
clock
For more information about this article,please follow the link:

http://googleurl?sa=t&source=web&cd=1&ve...AN1930.pdf&ei=qZK5TLHWHorfcd_64MEM&usg=AFQjCNFpjYl2fJstLMYMu0DMXQaQfIcQYg

to get information about the topic Voltage frequency control of 3phase induction motor. full report ,ppt and related topic refer the page link bellow

http://studentbank.in/report-speed-contr...ique-refer

http://studentbank.in/report-speed-contr...pic30f4011

http://studentbank.in/report-spedd-contr...ull-report

http://studentbank.in/report-speed-contr...ontrollers

http://studentbank.in/report-three-phase...tion-motor

http://studentbank.in/report-linear-indu...9#pid61329

I have seen this project useful. But I want the program to be edited to suit a motor for 1 to 400 hz frequency. The author mentioned that the user can edit the parameters. I dont have knowledge of programming. Can you edit this for me. Contact me at ajaydevb[at]gmail.com Thankyou,

to get information about the topic "pwm technique applied to induction motor"full report ppt and related topic refer the page link bellow


http://studentbank.in/report-pulse-width...e=threaded

http://studentbank.in/report-speed-contr...e=threaded

I want to know how a chopper can be used in wireless speed control of three phase induction motor using pwm technique