Thursday, February 25, 2010

Basic Brushless DC Motor


Basic brushless DC Motor


However, if, at the appropriate time, current is shut off in winding “R”, and turned on in winding “S”, then the rotor continues to move. Again at the appropriate time, shut off “S” and turned on “T”. By continuation of this timing sequence, complete rotation occurs. What is occurring, is that the field set up by the stator is being switched, and the rotor tries to catch up to it.

In this example, the explanation was simplified by exciting only one winding at a time. In reality, the stator consists of a three phase Y–connected winding, and two or three windings are actually energized.. This makes efficient use of windings and development of higher motor torques.

Basic Brushless Motor Basics


In its simplest form, a brushless dc motor consists of a permanent magnet, which rotates (the rotor), surrounded by three equally spaced windings, which are fixed (the stator). Current flow in each winding produces a magnetic field vector, which sums with the fields from the other windings. By controlling currents in the three windings, a magnetic field of arbitrary direction and magnitude can be produced by the stator. Torque is then produced by the attraction or repulsion between this net stator field and the magnetic field of the rotor.


Basic Brushless DC Motors
Conventional dc motors are highly efficient and their characteristics make them suitable for use as servomotors. However, their only drawback is that they need a commutator and brushes which are subject to wear and require maintenance. When the functions of commutator and brushes were implemented by solid-state switches, maintenance-free motors were realised. These motors are now known as brushless dc motors. In this chapter, the basic structures, drive circuits, fundamental principles, steady state characteristics, and applications of brushless dc motors will be discussed.
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Wednesday, February 17, 2010

Brushed DC Motor control by using PIC Microcontroller


Low-Cost Bidirectional Brushed DC Motor Control
Using the PIC16F684
INTRODUCTION
This application note discusses how to use the
Enhanced, Capture, Compare, PWM (ECCP) on the
PIC16F684 Microcontroller for bidirectional, brushed DC (BDC) motor
control. Low-cost brushed DC motor control can be
used in applications such as intelligent toys, small
appliances and power tools. The PIC16F684 takes
Microchip's Mid-Range Family of products to the next
level with its new ECCP peripheral. The ECCP
peripheral builds on the technology of the CCP module
with added features such as four PWM channels for
easy bidirectional motor control through the hardware.
This application note focuses on using the ECCP in
PWM mode using the full-bridge configuration. Using
the ECCP allows easy interfacing to a full-bridge
configuration for bidirectional BDC motor control.



Brushed DC Motor control by using PIC microcontroller
I used PIC microcontroller to realize the control of BLDC motor. In the video, you can observe how the PID parameter affect the performance of motor. The different magnitudes (due to different PID parameters)


Efficient Brushless DC motor and Permanent Magnet Synchronous Motor Control
Demonstration of advanced sensorless algorithms such as field oriented control and trapezoidal control using sinusoidal drive for Brushless DC (BLDC) and Permanent Magnet (PM) Synchronous Motors


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Sunday, February 14, 2010

Brushless DC Motor Control using PIC18 Microcontroller Video

Video Developing Brushless DC (BLDC) motor control using PIC18Fxx31 Microcontroller - Part 1
BLDC motors can be designed to operate from a high voltage or low voltage source. The following seminar explores BLDC control using PIC18F Microcontroller devices.


Video Developing Brushless DC (BLDC) motor control using PIC18Fxx31 Microcontroller - Part 2


Video Developing Brushless DC (BLDC) motor control using PIC18Fxx31 Microcontroller - Part 3


Video Developing Brushless DC (BLDC) motor control using PIC18Fxx31 Microcontroller - Part 4


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Monday, February 8, 2010

Sensorless Brushless DC Motor control using a Microcontroller Data and algorithm

Sensorless Brushless DC Motor Control with Z8 Encore! MC™ Microcontrollers
Abstract
This application note discusses the closed loop control of a 3-Phase Brushless
Direct Current (BLDC) motor using the Z8 Encore! MC™ Family of
Microcontrollers series microcontrollers (MCUs). The Z8 Encore! MC™ product
family is designed specifically for motor control applications, featuring an on-chip
integrated array of application-specific analog and digital modules. This in turn
results in fast and precise fault control, high system efficiency, and “on-the-fly”
speed / torque and direction control, as well as ease of firmware development for
customized applications.

This article further discusses ways on how to implement a sensorless feedback
control system using a “Phase Locked Loop” along with Back EMF sensing.


Sensorless control of 3-phase brushless DC motors
Introduction
This application note describes how to implement sensorless commutation control
of a 3-phase brushless DC  motor (BLDC) with the low cost ATmega48
microcontroller. A general solution, suitable for most 3-phase BLDC motors on the
market is presented. The full source code is written in the C language, no assembly
is required. Adaptation to different motors is done through the setting of parameters
in the source code.

The ATmega48/88/168 devices are all pin and source code compatible. The only
difference is memory sizes. This application note is written with ATmega48 in mind,
but any reference to ATmega48 in this document also applies to ATmega88/168.


Brushed DC motor control using the LPC2101 microcontroller
Introduction
This application note demonstrates the use of a low cost NXP Semiconductors LPC2101 microcontroller for bidirectional brushed DC motor control.
The LPC2101 is based on a 16/32-bit ARM7 CPU combined with embedded high-speed flash memory. A superior performance as well as their tiny size, low power consumption and a blend of on-chip peripherals make these devices ideal for a wide range of applications. Various 32-bit and 16-bit timers, 10-bit ADC and PWM features through output match on all timers, make them particularly suitable for industrial control. 

Brushed DC (Direct Current) motors are most commonly used in easy to drive, variable speed and high start-up torque applications. They have become widespread and are available in all shapes and sizes from large-scale industrial models to small motors for light applications (such as 12 V DC motors).


Sensorless BLDC Motor Control Using MC9S08AC16
Introduction
This application note describes the design of a 3-phase
sensorless BLDC motor drive with Back-EMF
zero crossing. It is based on Freescale’s MC9S08AC16
that can be effectively used for motor-control
applications.

The concept of the application is that of a speed-closed
loop drive using Back-EMF zero crossing technique for
positional detection. It serves as an example of a
sensorless BLDC motor control system using
Freescale’s MCU and 3-Phase BLDC/PMSM
Low-Voltage Motor Control Drive. It also illustrates
the usage of general on-chip peripherals for
motor-control applications.
This application note includes a description of the
controller features, basic BLDC motor theory, system
design concept, hardware implementation, software
design including the FreeMaster software visualization
tool, application setup, and demo operation.




Sensorless Brushless DC Motor Control with PIC16 Microcontroller
INTRODUCTION
There is a lot of interest in using Brushless DC (BLDC)
motors. Among the many advantages to a BLDC motor
over a brushed DC motor, we can enumerate the
following:
• The absence of the mechanical commutator
allows higher speeds
• Brush performance limits the transient response
in the DC motor
• With the DC motor you have to add the voltage
drop in the brushes among motor losses
• Brush restrictions on reactance voltage of the
armature constrains the length of core reducing
the speed response and increasing the inertia for
a specific torque
• The source of heating in the BLDC motor is in the
stator, while in the DC motor it is in the rotor,
therefore it is easier to dissipate heat in the BLDC
• Reduced audible and electromagnetic noise



Brushless DC Motors Theory and Driver Circuit

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