The chapter describes how to implement an online identification method for induction motors within a field-oriented control by using least squares (LS) methods. In particular, it focuses on how to develop the experimental rig by a step-by-step approach, where the different components of the set-up are described to enable readers to have a reference on their own. Attention has been paid both to the connections of the sensors (current, voltage and rotor speed) to the digital signal processing (DSP) of the dSPACE platform and to the construction of the circuits and design of the signal processing part. Experimental results are then presented and discussed to assess the behaviour of the experimental rig with different LS methods to show the flexibility of the test set-up.

Chapter Contents:

• 12.1 Introduction
• 12.2 FOC design
• 12.2.1 Controller tuning
• 12.2.1.1 Current loop tuning
• 12.2.1.2 Flux loop tuning
• 12.2.1.3 Speed loop tuning
• 12.3 Description of the test bed
• 12.4 dSPACE AutoBox
• 12.4.1 DS1007 PPC processor board
• 12.4.2 DS5001 digital waveform capture board
• 12.4.3 DS4002 timing and digital I/O board
• 12.4.4 DS2004 high-speed A/D board
• 12.4.5 Hardware scheme and interface with dSPACE: I/O boards
• 12.5 IGBT inverter
• 12.6 Induction motor
• 12.7 Sensors of current, voltage and speed
• 12.7.1 Encoder configuration
• 12.7.2 Current sensor configuration
• 12.7.3 Voltage sensor configuration
• 12.8 Online estimation of the parameters: method and implementation
• 12.8.1 Description of the method
• 12.8.2 Description and realization of the signal processing system
• 12.8.3 Anti-aliasing filter
• 12.8.4 Digital processing
• 12.9 Experimental results
• 12.10 Summary
• Appendix
• List of symbols
• Glossary of terms
• References
• Further References

Inspec keywords: least squares approximations; voltage measurement; electric current measurement; parameter estimation; electric sensing devices; digital signal processing chips; induction motor drives; machine vector control; velocity measurement

Other keywords: voltage sensors; induction motors; dSPACE platform; field-oriented control; rotor speed sensors; DSP; least square method; current sensors; online parameter identification method; digital signal processing; AC drives; signal processing; LS method

Subjects: Drives; Digital signal processing chips; Control of electric power systems; Velocity, acceleration and rotation measurement; Voltage measurement; Interpolation and function approximation (numerical analysis); Sensing devices and transducers; Other topics in statistics; Asynchronous machines; Interpolation and function approximation (numerical analysis); Current measurement; Digital signal processing chips; Electric transducers and sensing devices; Other topics in statistics