By Vlado Ostović
This booklet highlights strategies used by the layout departments of best worldwide brands, supplying readers crucial insights into the electromagnetic and thermal layout of rotating box (induction and synchronous) electrical machines. additional, it info the physics of the main phenomena curious about the machines’ operation, conducts an intensive research and synthesis of polyphase windings, and offers the instruments and strategies utilized in the review of winding functionality. The publication develops and solves the machines’ magnetic circuits, and determines their electromagnetic forces and torques. distinct realization is paid to thermal difficulties in electric machines, in addition to fluid move computations. With a transparent emphasis at the sensible points of electrical computer layout and synthesis, the writer applies his approximately forty years adventure with electrical computer brands – either as an worker and advisor – to supply readers with the instruments they should ascertain fluid move parameters and compute temperature distributions.
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Additional resources for The Art and Science of Rotating Field Machines Design: A Practical Approach
Sample text
28 No-load voltage and field losses of the wound rotor generator. u. of the field current. 85 MW at a given speed. 85 Permanent magnet generator at: 20°C 120°C 2 0 0 30 60 90 120 150 180 Fig. 3 %. The output power-load angle curves of both generators are shown in Fig. 29. One should keep in mind that in the given application (wind generator), the generator active part weight has an impact on the tower construction. Therefore, the wound rotor generator not only delivers more torque from a given volume, but also helps reduce the weight and mechanical stresses on the tower significantly when built for the same power as its PM counterpart.
24 Flux lines distribution in a permanent magnet DC motor: a at no load; b due to load ampere-turns, without magnets; c at load Considering very low relative permeability of permanent magnets (typically slightly above 1), the flux created by armature reaction ampere-turns is too weak to leave any considerable trace on machine performance. Aside from uncontrollability in the speed range above the no-load speed, a DC permanent magnet motor is more advantageous than its wound rotor counterpart. As opposed to a permanent magnet excited DC machine, where armature current has negligible influence on main flux, the armature reaction ampere-turns play a decisive role in the performance of a synchronous machine.
15b supplies additional component of current, the ampere-turns of which compensate for the ampere-turns of the second coil, and the flux U remains unchanged. , there is no armature reaction. 5 T [5]. Typical AC lamination losses of 4 W/kg correspond to a loss density of about 30 kW/m3. Hysteresis losses dominate at industrial frequencies if the AC flux spreads in direction of lamination. This is the most common case in heteropolar machines, the active part of which carries flux density with only radial and tangential components.