By Jacek F. Gieras
Axial Flush everlasting Magnet (AFPM) brushless machines are sleek electric machines with loads of helpful benefits over their traditional opposite numbers. they're more and more utilized in energy iteration, family home equipment, business drives, electrical automobiles, and marine propulsion drives and lots of different applications.
This ebook offers with the research, building, layout, optimisation, keep an eye on and purposes of AFPM machines. The authors current their very own study results,as good assignificant examine contributions made through others.
This monograph could be of curiosity to electric engineers and different engineers excited by the layout and alertness of AFPM brushless computer drives. will probably be a big source for researchers and graduate scholars within the box of electric desktop and drives.
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Additional info for Axial Flux Permanent Magnet Brushless Machines
C. current is where is the number of armature turns per phase, is the average length of turn, is the number of parallel current paths, is the number of parallel conductors, is the electric conductivity of the armature conductor at given temperature (for a copper conductor at 20°C and at 75°C), and is the conductor cross section. The average length of the armature turn is in which is the length of the inner end connection and is the length of the outer end connection. c. e. where is the skin-effect coefficient for the stator (armature) resistance.
Factors limiting the single disc design are: (a) axial force taken by bearings; (b) integrity of mechanical joint between the disc and shaft; (c) disc stiffness. A more reasonable solution for large torques are double or triple disc motors. There are several configurations of multidisc motors [5–7, 55, 73, 74]. Large multidisc motors rated at least 300-kW have a water cooling system (Fig. 7) Principles of AFPM machines 33 with radiators around the winding end connections . To minimize the winding losses due to skin effect, variable cross section conductors may be used so that the cross section of conductors is bigger in the slot area than in the end connection region.
A. e. to peak value of the magnetic Both the pole pitch and pole width are functions of the radius the parameter is normally independent of the radius. 15), is the radius element, is the surface element and is the vector of the normal component (perpendicular to the disc surface) of the magnetic flux density in the air gap. 16) is The line current density is the electric loading per one stator active surface in the case of a typical stator winding distributed in slots (double-sided stator and internal rotor) or electric loading of the whole stator in the case of an internal drum type or coreless stator.