Motorola M68HC08 Introduction, Contents, Application Functionality, Benefits of the Solution

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

Designer Reference Manual — Sensorless BLDC Motor Control

Section 1. Introduction

1.1 Contents

1.2Application Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.3Benefits of the Solution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.2Application Functionality

This Reference Design describes the design of a low-cost sensorless 3-phase brushless dc (BLDC) motor control with back-EMF (electromotive force) zero-crossing sensing. It is based on Motorola’s MC68HC908MR32 microcontroller which is dedicated for motor control applications. The system is designed as a motor drive system for medium power three phase BLDC motors and is targeted for applications in automotive, industrial and appliance fields (e.g. compressors, air conditioning units, pumps or simple industrial drives). The reference design incorporates both hardware and software parts of the system including hardware schematics.

1.3 Benefits of the Solution

The design of very low cost variable speed BLDC motor control drives has become a prime focus point for the appliance designers and semiconductor suppliers.

Today more and more variable speed drives are put in appliance or automotive products to increase the whole system efficiency and the product performance. Using of the control systems based on semiconductor components and MCUs is mandatory to satisfy requirements for high efficiency, performance and cost of the system.

DRM028 — Rev 0		Designer Reference Manual
MOTOROLA	Introduction	13
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