Jacek F. Gieras

Linear synchronous motors : transportation and automation systems

Topology and Selection Definitions, Geometry, and Thrust Generation Linear Synchronous Motor Topologies Calculation of Forces Linear Motion Selection of Linear Motors Materials and Construction Materials Laminated Ferromagnetic Cores Permanent Magnets Conductors Principles of Superconductivity Laminated Stacks Armature Windings of Slotted Cores Slotless Armature Systems Electromagnetic Excitation Systems Superconducting Excitation Systems Hybrid Linear Stepping Motors Theory of Linear Synchronous Motors Permanent Magnet Synchronous Motors Motors with Superconducting Excitation Coils Variable Reluctance Motors Permanent Magnet Hybrid Motors Motion Control Control of AC Motors EMF and Thrust of PM Synchronous and Brushless Motors Dynamic Model of a PM Motor Thrust and Speed Control of PM Motors Control of Hybrid Stepping Motors Precision Linear Positioning Sensors Linear Optical Sensors Linear magnetic Encoders High Speed Maglev Transport Electromagnetic and Electrodynamic Levitation Transrapid System (Germany) Yamanashi Maglev Test Line in Japan Swissmetro Marine Express Building and Factory Transportation Systems Elevator Hoisting Machines Ropeless Elevators Assessment of Hoist Performance Horizontal Transportation systems Industrial Automation Systems Automation of Manufacturing Processes Casting Processes Machining Processes Welding and Thermal Cutting Surface Treatment and Finishing Material Handling Testing Industrial Laser Applications Appendix A Magnetic Circuits with Permanent Magnets Appendix B Permeances for Magnetic Fluxes Appendix C Performance Calculations for PM LSMs Symbols and Abbreviations References

Performance Calculation for a High-Speed Solid-Rotor Induction Motor

The paper deals with analytical method of design and prediction of performance characteristics for induction motors with solid steel rotor coated with copper layer. On the basis of the distribution of the 2-D electromagnetic field, the equivalent impedance of the rotor has been derived. The edge effect and nonlinear magnetic permeability of solid steel have been included. The presented analytical method has been verified with laboratory test results. A 300 kW, 60 000-rpm, three-phase solid-rotor induction motor for the next generation air compressor has been investigated. The accuracy of analytical approach is acceptable and can be recommended for rapid design of solid-rotor induction motors.

Calculation of eddy current losses in conductive sleeves of synchronous machines

In this paper, analytical and finite element method (FEM) approaches to calculation of eddy current losses in conductive non-magnetic sleeves (cans) of synchronous or induction machines are presented. Those losses are especially important in high speed electrical machines as the sleeve losses are a function of the second power of rotational speed. In some applications, non-conductive sleeves, e.g. carbon graphite cannot be used due to problems with thermal compatibility of rotor and stator materials.

Performance calculation for a high speed solid-rotor induction motor

The paper deals with analytical method of design and prediction of performance characteristics for induction motors with solid steel rotor coated with copper layer. On the basis of the distribution of the 2D electromagnetic field, the equivalent impedance of the rotor have been derived. The edge effect and nonlinear magnetic permeability of solid steel have been included. The presented analytical method has been verified with laboratory test results. A 300 kW, 60 000-rpm, three-phase solid rotor induction motor for air compressor has been investigated. The accuracy of analytical approach is acceptable and can be recommended for rapid design of solid rotor induction motors.

Permanent Magnet Synchronous Motors

There are many configurations of permanent magnet machine, some of them are more significant than others. Machines are most commonly 3-phase but single phase capacitor start and run designs can be very effective. There is an ever widening choice of magnet materials available, but the most useful are the ferrites and the rare earths, whether samarium cobalt or neodymium-iron-boron. The choice of magnet depends on the specification, with initial cost and operating temperature having an important role. The author examines motor characteristics for three types of permanent magnet synchronous motors and assesses the cost effectiveness of each type.

Distributed Wind Generator

1 Professor, Electrical Engineering, ul. Ks. Kordeckiego 20, 85-225 Bydgoszcz 2 Staff Scientist, Engine Systems, 1 Hamilton Road, M/S B3-1-6C, Associate Fellow AIAA, Corresponding Author The paper deals with a new architecture of wind turbine generators. The proposed wind turbine consists of a number of integrated smaller individual generators. The individual generators can be arranged in a rectangular matrix or in a circle. The paper discusses sizing procedure for this type of generators, electromagnetic calculations including the finite element method (FEM) simulation, performance characteristics and advantages of this type of wind generator. As an example, a permanent magnet brushless generator has been considered.