Saturday, October 2, 2010

Dynamic Model , Proportional Integral and Derivative Control of Brushless DC Motor

Proportional Integral and Derivative Control of Brushless DC Motor

Brushless DC (BLDC) motors are one of the electrical drives that are rapidly
gaining popularity, due to their high efficiency, good dynamic response and low
maintenance. In this paper, the modeling and simulation of the BLDC motor was done
using the software package MATLAB/SIMULINK. A speed controller has been designed
successfully for closed loop operation of the BLDC motor so that the motor runs very
closed to the reference speed. The simulated system has a fast response with small
overshoot and zero steady state error.

Dynamic Model of the BLDC Motor

It is assumed that the BLDC motor is connected to the output of the inverter, while the inverter input terminals are connected to a constant supply voltage, as shown in Fig.1. Another assumption is that there are no power losses in the inverter and the 3-phase motor winding is connected in star.

Wednesday, September 15, 2010

Basic brushless motor control

The control consists of logic circuitry and a power stage to drive the motor. The control’s logic circuitry is
designed to switch current at the optimum timing point. It receives information about the shaft/magnet
location (signals from the Hall devices), and outputs a signal, to turn on a specific power device, to apply
power from the power supply (not shown) to specific windings of the brushless motor.

Brushless DC Motor Control Made Easy

This application note discusses the steps of developing
several controllers for brushless motors. We cover sensored,
sensorless, open loop, and closed loop design.
There is even a controller with independent voltage and
speed controls so you can discover your motor’s characteristics

The code in this application note was developed with
the Microchip PIC16F877 PICmicro® Microcontroller, in
conjuction with the In-Circuit Debugger (ICD). This
combination was chosen because the ICD is inexpensive,
and code can be debugged in the prototype hardware
without need for an extra programmer or
emulator. As the design develops, we program the target

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