Patent
Polyphase alternator with single phase output
TLDR
In this article, an alternating current electrical power generator of the rotating field type whose output frequency is independent of the rotational speed of the field was presented, where low frequency electrical power was produced by generating a high frequency polyphase voltage which is rectified alternately positive and negative and by simultaneously modulating the level of the high frequency voltage with a low frequency sine wave.Abstract:
An alternating current electrical power generator of the rotating field type whose output frequency is independent of the rotational speed of the field. Low frequency electrical power is produced by generating a high frequency polyphase voltage which is rectified alternately positive and negative and by simultaneously modulating the level of the high frequency voltage with a low frequency sine wave.read more
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Patent
Low inductance electrical machine
TL;DR: In this article, a low inductance electrical machine that can be used as an alternator or motor with low armature inductance is presented, where the fluxes induced by currents in the armature windings effectively cancel leading to low magnetic energy storage within the machine.
Patent
Regulated AC power system energized by variable speed prime mover
TL;DR: In this article, a three phase alternator is driven by a variable speed prime mover, and its rectified output is pulse width modulated by a gate controlled H-bridge power switch circuit.
Patent
Engine-driven generator
TL;DR: In this article, an engine-driven generator includes an internal combustion engine, a permanent magnet alternator and an AC-to-AC converter, whose output frequency and voltage are largely dependent on engine speed and the alternator load.
Patent
Permanent magnet alternator
TL;DR: The stator core is formed by winding the strip edgewise around a cylindrical mandrel to facilitate winding and avoid distortion, arcuate regions, conforming to the curve of the mandrel, are formed in the strip opposite the teeth as mentioned in this paper.
Patent
An electrostatic dust precipitator
TL;DR: An electrostatic dust precipitator comprises a separation filter (5) having emitter and collector electrodes (4,6), means (1-3, 7-11) for maintaining a substantially constant d.c. voltage between the electrodes during opera-tion of the precipitators, and pulse-generating means for generating at a given frequency in the order of 30-500 Hz voltage pulses or voltage pulse trains which are superimposed on the voltage and which are of short duration in relation to the aforementioned frequency as mentioned in this paper.
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Patent
Apparatus for providing ac electrical energy at a preselected frequency
TL;DR: In this article, a method and apparatus for providing AC electrical energy at a preselected frequency including a driven AC generator having an externally excitable field, means connected to the generator field for exciting the field at the pre-selected frequency whereby the generated AC output is modulated at a specified frequency, and rectifier means connected with the generator output by which the modulated generator output is rectified to obtain AC output at the selected frequency, the frequency of the AC output being independent of the speed of rotation of the generator.
Patent
Frequency changer having a constant frequency output
TL;DR: In this paper, a frequency changer with adjustable constant frequency output with a higher fixed or variable frequency input from a polyphase source, such as a 3-phase alternator, provides a current path through a utilization means in one direction for a first interval of time and in the opposite direction in the second interval of times with the current paths being alternately applied at the selected constant frequency with the alternating application of the paths is under the control of a circuit that includes a first group of thyristors connected in a bridge circuit for the first direction of current flow and a second