AN1913 Motorola / Freescale Semiconductor, AN1913 Datasheet

AN1913

Manufacturer Part Number

AN1913

Description

AN1913 3-phase BLDC Motor Control with Sensorless Back-EMF ADC Zero Crossing Detection using DSP 56F80x

Manufacturer

Motorola / Freescale Semiconductor

Datasheet

1.AN1913.pdf (56 pages)

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Semiconductor Application Note

3-phase BLDC Motor

Control with Sensorless

Back-EMF ADC Zero

Crossing Detection using

DSP 56F80x

Design of Motor Control Application Based on

the Motorola Software Development Kit SDK

Libor Prokop,

Leos Chalupa

MOTOROLA

This Application Note describes the design of a 3-phase

sensorless BLDC motor drive with Back-EMF Zero Crossing

using an AD convertor. It is based on Motorola’s DSP

56F80x family dedicated for motor control applications. The

software design uses the SDK (Software Development Kit)

developed by Motorola.

The concept of the application is that of a speed-closed loop

drive using an AD convertor for Back-EMF Zero Crossing

technique position detection. It serves as an example of a

sensorless BLDC motor control system using Motorola DSP

with SDK support. It also illustrates the usage of dedicated

motor control on chip peripherals, software drivers and

software libraries that are included in the SDK.

This Application Note includes a description of the Motorola

DSP features, basic BLDC motor theory, system design

concept, hardware implementation and software design

including the PC Master visualization tool inclusion.

The Motorola DSP56F80x family are well suited for digital

motor control, combining the DSP’s calculation capability

with the MCU’s controller features on a single chip. These

DSPs offer many dedicated peripherals like Pulse Width

Introduction

Motorola DSP Advantages and

Features

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

2. Motorola DSP Advantages and

3. Target Motor Theory ..................... 3

4. System Design Concept ............... 10

5. Control Technique ....................... 14

6. Hardware ..................................... 28

7. Software Design .......................... 32

8. PC Master.................................... 49

9. DSP Usage .................................. 49

10. Setting of Software Parameters for

11. References ................................. 55

3.1 BLDC Motor Targeted by This

3.2 3-Phase BLDC Power Stage........... 6

3.3 Why Sensorless Control?................ 6

3.4 Power Stage - Motor System

3.5 Back-EMF Sensing......................... 9

4.1 System Specification .................... 10

4.2 Sensorless Drive Concept ............. 12

5.1 Control Technique - General

5.2 PWM Voltage Generation for

5.3 Back-EMF Zero Crossing Sensing16

5.4 Sensorless Commutation Control . 18

5.5 Speed Control ............................... 28

6.1 System Outline ............................. 28

6.2 Low Voltage Evaluation Motor

6.3 Low Voltage Hardware Set .......... 30

6.4 High Voltage Hardware Set.......... 31

7.1 Main Software Flow Chart ........... 32

7.2 Data Flow ..................................... 35

7.3 State Diagram ............................... 39

10.1 Current and Voltage Settings........ 51

10.2 Commutation Control Settings ..... 51

10.3 Speed setting................................. 54

11.1 Software Development Kit, SDK

11.2 User’s Manuals and

Features .................................... 1

Application...................................... 3

Model .............................................. 7

Overview ....................................... 14

BLDC ............................................ 14

Hardware Set................................. 29

Other Motors .......................... 50

rev.2.3............................................ 55

Application Notes.......................... 55

Contents

(Motorola Order Number)

Order by AN1913/D

Rev. 1.0, 03/2001

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