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Sensorless PMSM Vector Control with a

Sliding Mode Observer for Compressors

Using MC56F8013

Devices Supported:

MC56F8013

MC56F8023

Document Number: DRM099

Rev. 0

09/2008

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DRM099

Rev. 0

09/2008

Sensorless PMSM Vector Control with a Sliding Mode Observer for Compressors Using MC56F8013, Rev. 2

Freescale Semiconductor -1

Chapter 1

Introduction

1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.1.1 Application Features and Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.1.2 Sinusoidal PM Synchronous Motors Applications Overview . . . . . . . . . . . . . . . . . . . . 1-2

1.2 Freescale Controller Advantages and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

1.3 Front Matter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

1.3.1 Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

1.3.2 Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

1.3.3 Acronyms and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

1.3.4 Glossary of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

1.3.5 Glossary of Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Chapter 2

Control Theory

2.1 Three-Phase PM Synchronous Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2.2 Mathematical Description of PM Synchronous Motors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2.2.1 Space Vector Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2.2.2 PM Synchronous Motor Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.3 Vector Control of PM Synchronous Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

2.3.1 Fundamental Principle of Vector Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

2.3.2 Description of the Vector Control Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2.3.3 Stator Voltage Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

2.3.4 Space Vector Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

2.4 Sensorless Control of PM Synchronous Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

2.4.1 Sensorless PM Synchronous Motor Technique Classification . . . . . . . . . . . . . . . . . . 2-12

2.4.2 Sliding Mode BEMF Observer with Adaptive Velocity Estimation . . . . . . . . . . . . . . 2-13

2.4.3 Open-Loop Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

Chapter 3

System Concept

3.1 System Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.2 Application Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

3.3 Control Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Chapter 4

Hardware

4.1 Hardware Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.2 MC56F8013 or MC56F8023 Controller Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4.3 Three-Phase AC/BLDC High Voltage Power Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4.4 Motor Specifications — Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Sensorless PMSM Vector Control with a Sliding Mode Observer for Compressors Using MC56F8013, Rev. 2

Freescale Semiconductor -2

Chapter 5

Software Design

5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.2 Application Variables Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.2.1 Fractional Numbers Representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.2.2 Scaling of Analogue Quantities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.2.3 Scaling Angles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

5.2.4 Scaling Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

5.3 Application Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

5.3.1 SW Versions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4

5.3.2 ADC End of Scan Timing and PWM Reload Interrupts . . . . . . . . . . . . . . . . . . . . . . . . 5-5

5.3.3 Current Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

5.3.4 Sliding Mode Observer with Adaptive Velocity Estimation Implementation . . . . . . . 5-10

5.3.5 Auxiliary Position and Speed Sensing Using Encoder . . . . . . . . . . . . . . . . . . . . . . . . 5-13

5.4 Software Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15

5.4.1 SW States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16

5.4.2 Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20

5.4.3 Application Background Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21

5.4.4 Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21

5.4.5 PI Controller Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-23

5.5 FreeMASTER Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

5.5.1 FreeMASTER Serial Communication Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24

5.5.2 FreeMASTER Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25

5.5.3 FreeMASTER Control Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25

5.6 SW Parameters Setting to a Specific Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-27

Chapter 6

Application Setup

6.1 MC56F8013 and MC56F8023 Controller Board Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

6.2 MC56F8346 Controller Board Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

6.3 Demo Hardware Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Chapter 7

Results and Measurements

7.1 System and Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.1.1 HW Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.1.2 SW Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.1.3 FreeMASTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.1.4 Rotor Angle Estimation Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.2 Sensorless Estimation with the d, q Coordinate SMO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

7.2.1 Required Speed Step Transient – d, q Coordinate SMO . . . . . . . . . . . . . . . . . . . . . . . . 7-3

7.2.2 Load Torque Step Transient – d, q Coordinate SMO . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5

7.2.3 Constant Speed Measurements – d, q Coordinate SMO . . . . . . . . . . . . . . . . . . . . . . . . 7-6

7.2.4 Start-up – d, q Coordinate SMO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

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