Synchronous Reluctance Machines: Analysis, optimization and applications (Energy Engineering)

✍ Scribed by Nicola Bianchi, Cristian Babetto, Giacomo Bacco

• Publisher: The Institution of Engineering and Technology
• Year: 2022
• Tongue: English
• Leaves: 352
• Category: Library

✦ Synopsis

Reluctance motors induce non-permanent magnetic poles on the ferromagnetic rotor; the rotor does not have any windings and torque is generated through magnetic reluctance. Synchronous reluctance motors (SyRMs) have an equal number of stator and rotor poles. Reluctance motors can deliver high power density at low cost, so they are finding increasing application in the transport sector. Disadvantages include high torque ripple and the complexity of designing and controlling them. Advances in theory, computer design, and control electronics can overcome these issues.

This hands-on reference covers the concept and design of synchronous reluctance motors. It conveys all key topics required to understand this technology. Chapters cover magnetic materials, geometry, modeling, design and analysis, optimization, production technology, fault-tolerance, experimental validation, and self-sensing-oriented optimization.

Synchronous Reluctance Machines: Analysis, optimization and applications is ideal for researchers working on electrical machines and motors, particularly electric vehicles. The writers - experts from academia and industry - provide the reader with an excellent background and understanding of the core concepts involved in synchronous reluctance motors such that they can engage in their own R&D.

✦ Table of Contents

Contents
About the authors
List of acronyms
List of symbols
1. Introduction
1.1 A brief history
1.2 Drawbacks in using rare-earth PMs
1.3 Increasing interest in Synchronous Reluctance machines
2. Magnetic materials
2.1 Ferromagnetic materials
2.2 Permanent magnets
2.3 Bonded magnets
2.4 BMs preparation
2.5 BMs magnetization and characterization
2.6 Losses in magnetic materials
3. Synchronous reluctance motor geometry drawing
3.1 Fluid flux-barrier rotor geometry
3.2 Segmented flux-barrier rotor
3.3 Flux-barriers and iron channels design
4. Reluctance network model of high-speed synchronous reluctance machines
4.1 Improved reluctance network
4.2 Finite element analysis results
4.3 Results comparison
4.4 Discussion
5. Nonlinear analytical model for synchronous reluctance machines
5.1 Development of the analytical model
5.2 Analytical model
5.3 Rotor magnetic potentials computation
5.4 Radial iron ribs computation
5.5 Computation of the sleeve thickness
5.6 Analytical model of the SYR motor
5.7 Analytical model with saturation
5.8 Torque maps
5.9 Discussion
6. Design criteria of flux-barriers in synchronous reluctance machines
6.1 The simplified analytical model
6.2 One flux-barrier rotor
6.3 Two flux-barrier rotor
6.4 Three flux-barriers rotor
6.5 Design of asymmetric flux-barriers in SyRM
6.6 Rotor with two flux-barriers per pole
6.7 Experimental measurements
6.8 Discussion
7. Structural analysis with GetDP
7.1 Brief presentation of GetDP
7.2 Mathematical formulation for structural analysis
7.3 Cantilever beam with single load at the end
7.4 Cantilever beam with distributed load
7.5 Rotating hollow disk
7.6 Rotating SyR rotor geometry
8. Efficiency map computation
8.1 Introduction
8.2 Input data
8.3 Constant torque loci current points
8.4 Constant torque number of points homogenization
8.5 Creation of the 3D matrices
8.6 Computation of the derived quantities
8.7 Maximum efficiency computation
8.8 Efficiency map, including thermal limit
9. Multi-objective optimization
9.1 Problem statement
9.2 Missing pieces
10. Design and optimization of a PMaSyR motor for low-voltage E-scooter applications
10.1 Design requirements and data
10.2 Stator and rotor geometries
10.3 Design aspects regarding the number of turns
10.4 Individual evaluation procedure
10.5 Optimization results
10.6 Experimental results
10.7 Discussion
11. Synchronous reluctance motor optimization for pumping application
11.1 Rotor optimization
11.2 Chosen motor for prototype
11.3 Experimental measurements
11.4 Discussion
12. High-torque low-speed permanent magnet assisted synchronous reluctance motor design
12.1 Specifications, requirements and hypothesis
12.2 Parametric analyses
12.3 Optimization
12.4 Discussion
13. Bonded magnets in PMaSyR machines
13.1 Motor geometry
13.2 Prototype assembling
13.3 Experimental results
13.4 Conclusion
14. High-speed synchronous reluctance machines
14.1 Overview on a high-speed SyR machine
14.2 Design methodology for high-speed synchronous reluctance machines
14.3 First application example
14.4 Second application example
14.5 Comparison of high-speed synchronous reluctance and PM machines
15. Overview of fault-tolerant SyR machines
16. Impact of winding arrangement in dual three-phase synchronous reluctance machine
16.1 Overview
16.2 Dual three-phase winding arrangements
16.3 Torque behaviors
16.4 Radial force
16.5 Magnetic coupling between winding 1 and 2
16.6 Discussion
17. Optimization of a synchronous reluctance machine for fault-tolerant applications
17.1 Introduction
17.2 Rotor optimization strategies
17.3 WindingW-12-12 alternative configurations
17.4 Mutual magnetic coupling
17.5 Magnetic model of the machine
17.6 Conclusion
18. Experimental validation of a synchronous reluctance machine for fault-tolerant applications
18.1 Introduction
18.2 Dual three-phase winding arrangement
18.3 Motor geometry
18.4 Optimization results
18.5 Prototype
18.6 Torque behaviors
18.7 Magnetic coupling
18.8 Three-phase short circuit test
18.9 Discussion
19. Self-sensing-oriented optimization of synchronous reluctance machine design
19.1 Example of typical optimization
19.2 Self-sensing-oriented optimization
19.3 Discussion
20. Conclusions
References
Appendix A: Iron losses insights
A.1 Eddy currents iron losses coefficient
A.2 Element-by-element iron losses
Appendix B: MMF distribution along the stator periphery
B.1 Spatial harmonic
B.2 Rotating MMF
Appendix C: HS-SyR analytical model constants
Appendix D: GetDP elasticity formulation
Appendix E: Maxwell stress tensor derivation
Appendix F: High-frequency signal injection mathematical model
F.1 Induction motor
Appendix G: Incremental permeability simulations for differential inductances computation
G.1 Differential inductance computation
G.2 Plain magnetostatic only simulations
G.3 Incremental permeability simulations
G.4 Results comparison
G.5 Meaning of incremental permeability
Index