The high volatility of rare earth metals makes it very difficult to quote a price. The cost and availability of NdFeB magnets will likely determine the production rate of permanent magnet generators. Today the production of permanent magnets consumes the largest proportion of rare earth elements, with 40% of the rare earth-based magnets used for generators and other electrical machines. Technological and economical analysis of salient pole and permanent magnet synchronous machines designed for wind turbinesĬhinese export restrictions already reduced the planning reliability for investments in permanent magnet wind turbines. In one implementation, the disclosed embodiments can be used to synchronously regulate current in a vector controlled motor drive system that includes a five-phase AC machine, a five-phase inverter module coupled to the five-phase AC machine, and a synchronous current regulator. Methods, systems and apparatus are provided for controlling operation of and regulating current provided to a five-phase machine when one or more phases has experienced a fault or has failed. Methods, systems and apparatus for synchronous current regulation of a five-phase machine A novel rotor design which achieves a reduced quadrature-axis reactance is shown experimentally to be superior to the conventional homopolar rotor. The magnetic circuit is also arranged to minimize the axial force between the stator and rotor. The construction of the stator core is unusual and incorporates both laminated and unlaminated portions. The prototype machine produces approximately 7.5 kW of mechanical output at 3000 rev/min, with a product of power factor and efficiency greater than 0.7. The unlaminated mild-steel rotor contains no windings and is brushless. Results of an experimental and theoretical investigation of a disc-geometry homopolar synchronous machine with field excitation on the primary side are presented. In analogy with the history of perpetual-motion machines, it is suggested that the study of these whole-culture ' synchronization' methods might lead to an understanding of general biological principles even though these methods cannot be used to study the normal cell cycle.ĭisc-geometry homopolar synchronous machine Whole-culture or batch synchronization cannot, in theory, produce a synchronized culture because it violates a fundamental law that proposes that no batch treatment can alter the cell-age order of a culture. Is whole-culture synchronization biology's 'perpetual-motion machine'? A practical method is given for.calculating synchronized parameters in saturating synchronized machines with additional clearances and machines with superconducting excitation windings.
The work studies the effect of magnetic circuit saturation on the synchronous inductive reactance of the armature. TheĬalculating Synchronous Inductive Reactances of Contactless Machines When Magnetic Circuit is Saturated and of Machines with Superconducting Excitation Windings,
Data are given on the machine operated as a synchronous motor.
#Expectations multipatch receiving blanket generator#
Data are furnished on the.as a generator with its armature in LN2 and in the superconducting state are given. The report details the design and testing of a synchronous motor with superconducting field and armature windings. Experimental Investigation of Superconducting Synchronous Machines
0 kommentar(er)
