Advancements in Electric MachinesTraditionally, electrical machines are classi?ed into d. c. commutator (brushed) machines, induction (asynchronous) machines and synchronous machines. These three types of electrical machines are still regarded in many academic curricula as fundamental types, despite that d. c. brushed machines (except small machines) have been gradually abandoned and PM brushless machines (PMBM) and switched reluctance machines (SRM) have been in mass p- duction and use for at least two decades. Recently, new topologies of high torque density motors, high speed motors, integrated motor drives and special motors have been developed. Progress in electric machines technology is stimulated by new materials, new areas of applications, impact of power electronics, need for energy saving and new technological challenges. The development of electric machines in the next few years will mostly be stimulated by computer hardware, residential and public applications and transportation systems (land, sea and air). At many Universities teaching and research strategy oriented towards el- trical machinery is not up to date and has not been changed in some co- tries almost since the end of the WWII. In spite of many excellent academic research achievements, the academia–industry collaboration and technology transfer are underestimated or, quite often, neglected. Underestimation of the role of industry, unfamiliarity with new trends and restraint from technology transfer results, with time, in lack of external ?nancial support and drastic - cline in the number of students interested in Power Electrical Engineering. |
Contents
1 | |
Material engineering 27 | 26 |
High power density machines | 71 |
High speed machines | 81 |
Other types of novel motors 115 | 114 |
Electric motors for medical and clinical applications | 135 |
Generators for portable power applications | 157 |
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Common terms and phrases
actuators air gap aircraft alloys Alstom American Superconductors applications azimuth thruster brushless motor BSCCO cage coil cold plates compressor conductor Conf cooling system copper core losses coreless developed devices diameter disc type efficiency electric machines electric motor electromagnetic end ring energy engine ferromagnetic ferromagnetic core field excitation winding frequency gas turbine Halbach array heat high speed Hiperco homopolar HTS field excitation HTS motor HTS synchronous motor HTS wire IEEE IGBT induction motor integrated laminated load magnetic field magnetic flux density magnetic shape memory manufactured materials maximum mechanical mechatronics microgenerator NdFeB operation output power permanent magnet phase Photo courtesy PM brushless motor PM motors PMBMs power density power electronics propeller propulsor pump rated robot rotating rotor shaft ship propulsion shown in Fig slotless slots solid state converter stator stator core stator winding steel Superconductors Table torque vibration voltage W/kg YBCO