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Embedded control of an Adaptive Magnetic Flux Array challenges of distributed software in Power electronics system Sylvain Laversanne - August 14 2014
Embedded control of an Adaptive Magnetic Flux Array challenges of distributed software in Power electronics system
Sylvain Laversanne - August 14 2014
Summary
1. AMFA technology explained
2. Architecture and challenges
3. Software development
4. Conclusions
About AXIFLUX Axiflux® was incorporated in Melbourne, 2011 to research, design, manufacture and distribute a revolutionary range of electric motors and generators. The founding group are highly entrepreneurial focused on pushing the innovation envelope to its limits. Initial areas of focus encompass: • High-efficiency, high power density electric vehicle motors • Commercial pumps and ventilation fans • Conveyor belt motors • Direct-drive wind turbines
AMFA technology explained
Concept of the Adaptive Magnetic Flux Array : - Permanent Magnet Motor with an Axial Flux configuration:
- Compact & Efficient - High Torque low speed
- Independently controlled coils:
- Low ripple, low cogging torque - High Reliability - Freedom of design
- Applications:
- Direct drive - High Torque electronically speed/torque controlled
motors - In built redundancy
AMFA technology explained
Electronically controlled integrated motor : lab version, AMFA1
Stator
Rotor
Power electronics
AMFA technology explained
Electronically controlled integrated motor : lab version, AMFA2
Stator
Rotor
Power electronics
AMFA technology explained
Concept of an axial flux motor
Magnets Coils
Radial type
AMFA technology explained
High torque and high efficiency motor
…
AMFA technology explained
Independently driven coil motor
1 2 3 n-1 n
pos
neg
pos
neg
Each coil is driven by its own power electronics module
Architecture and challenges
Sensors and peripherals
0 1 2 3 4 5 6 7 8 9
x 10-3
-6
-4
-2
0
2
4
6
I2C low speed peripherals
High speed CANbus and Isolated Serial bus
Analog signals (I,V,etc.)
Piccolo DSP (1 of n slaves)
Delfino DSP Master/Interface DSP
Complex network & architecture ( analog, CANbus, I2C, serial, SPI, etc.)
Architecture and challenges
Fast Control loop
0 1 2 3 4 5 6 7 8 9
x 10-3
-6
-4
-2
0
2
4
6
Analog signals (I,V,etc.)
Piccolo DSP
Each Module is an arbitrary high power module: - Current waveform up to 1200Hz and more - Phase is critically locked - Feedback regulation in a single phase non stationary frame - Software fault detection is critical - Sampling Time is <35µs
Real Time, synchronised, Multitasking software
Software development
Classic approach, requiring : - Model in the Loop simulation - Software in the loop simulation - Rapid control prototyping
- Model based design
- Data logging and analysis
Software development
INPUTS DATA PROCESSING &
SAFETY
CALCULATION &
CONTROL
OUPUT
ADCs
CANbus
Serial
I2C
CANbus
ePWM
GPIOs
FAULT
Handling
Conditioning &
Error check
State
calculation
Observers
Control
Modulation &
conditioning
Delayed loop DATA Bus
Software architecture
Software development
SIMULATION
DATA PROCESSING &
SAFETY
CALCULATION &
CONTROL
FAULT
Handling
Conditioning &
Error check
State
calculation
Observers
Control
Modulation &
conditioning
Delayed loop DATA Bus
Simulation architecture
Software development
Tools used: MATLAB R2014a Simulink Fixed Point Designer Embedded Coder (C2000 DSP family) Vehicle Network Toolbox TI Code Composer Studio v5.5
Software development
Example of time saver: Full DSP configuration with GUI
Software development
Example of time saver: Direction implementation of standard CANbus databases
Software development
Example of time saver: GUI aided fixed-point design Access to optimised fixed-point mathematical functions
Software development
Example of time saver: Multitasking OS and easy use with minimum overhead
3 µs overhead for context switching between main interrupt and task start
Conclusions
- Fast tasking 25khz and more multitasking software is possible without
compromising with easy integration of network interfaces & peripherals
- Advantages of a model-based software (understandable, sharable, etc)
- MATLAB tools are time saving: for the same software design time has been divided by 5
- Rapid prototyping with embedded coder doesn’t require a specific hardware
- Versatile tool allowing rapid prototyping of any ECUs
- Versioning tools already integrated in the package
- Generated code is compliant with classic standard
