Rotary DC-AC Three Phase Converter

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This converter solves multiple problems for the energy industry. It can develop and modernize the national power system. Also, it can be applied to inventions that are superior to existing power technologies and it can extend the scope of theoretical research and practical application of energy systems.

Improving energy systems is done by increasing their power, the rotary converter system obtaining a superior power, theoretically infinite against existing static converters that have limited power.

Idea applies to farms with photovoltaic panels and wind turbines generating DC electrical energy and using this converter can power consumers such as neighborhoods, cities, and businesses.

Additional energy is transmitted to the national energy system. Because manufacturing the DC-AC three phase converter can be extended to DC-AC poly-phase, this idea can be used to study multiple phases energy systems. It is well known that the energy efficiency of systems with multiple phases is higher than in three phase systems.

The idea applies to homes powered with AC single-phase current which through rectification and filtration becomes DC and using this converter, it converts to three phase alternating current, in order to be used in a family business for loads powered by three phase electricity.

Lastly, the idea improves three phase electricity networks by using High Voltage DC transportation. Its efficiency is superior to that of AC three phase one. This converter, adapted for high voltage, transforms DC into three-phase AC and powers transformers which feeds the consumers.

Marketing potential is huge because the idea revolutionizes energy conversion at low cost electric three-phase alternating current to direct current. Necessity is the local national to global.

Operation is explained from simple to complex. In Figure 1 one observes single phase alternating current generation using a commutator with two segments of a DC brushed motor that acts as a DC single-phase AC converter.

Single phase alternating current is collected by two brushes in contact with slip rings. To achieve sinusoidal current there are used segments with the shape in Figure 1. If two segments generate single-phase AC, six segments, two for each phase, generate three-phase alternating current. The six commutator segments and slip rings are assembled, electrically insulated, on a shaft as in Figure 2. It is noted from the waveforms of three-phase alternating current, the phase angle between two neighboring phases is 2π/3 radians. Between pairs of neighboring segments of each phase must be the same phase angle as shown in Figure 3. The connections between segments and slip rings can be realized star or delta. In star connection there are four slip rings to have accessible neutral. Therefore three-phase AC is generated using DC.

Manufacturing of these converters is very simple. Commutator with two segments on each phase is manufactured using technologies from commutator DC motors, slip rings using technologies of slip rings from three phase AC induction motors with rotor winding.

Price of segments or slip rings used in the rotary converter is small compared with electronic components and can be obtained at a small cost from refurbished materials.


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  • Name:
    Marian Bida
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