基于FRDM-KE02Z的带霍尔传感器的BLDC电机控制_frdm-KL02Z资源-CSDN文库

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1 Introduction

The speed control circuits of DC motors are simple and easy

to use, and hence are very popular in motor speed control

systems. However, due to the brushes, DC motors suffer from

a lower reliability. The brushless DC (BLDC) motor is also

referred as an electronically commuted motor. There are no

brushes on the rotor and the commutation is performed

electronically at certain rotor positions.

Replacing a DC motor with a BLDC motor places higher

demands on a control algorithm and a control circuit.

• First, the BLDC motor is usually a three-phase system;

so, it has to be powered by a three-phase power supply.

• Second, the rotor position must be known at certain

angles in order to align the applied voltage.

The most common way to control a BLDC motor is to use

Hall sensors to determine the rotor position. The control

system senses the rotor position and the proper voltage pattern

is applied to the motor.

This application note describes the basic DC and BLDC motor

theory and the implementation of the six-step commutation

method on KE02 sub-family MCUs. KE02 is a 5 V MCU with

enhanced FlexTimer(FTM), suitable for BLDC motor control.

Freescale Semiconductor

Document Number:AN4776

Application Note

Rev 0, 07/2013

BLDC Motor Control with Hall

Sensors Based on FRDM-KE02Z

by:

Xianhu Gao

© 2013 Freescale Semiconductor, Inc.

Contents

1 Introduction................................................................1

2 Basic theory of motor control...................................2

3 Basic theory of six-step commutation

method.......................................................................6

4 How to control BLDC motor with

FRDM-KE02Z ........................................................10

5 Conclusion...............................................................14

6 References...............................................................14

7 Revision history......................................................15

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