Permanent magnet synchronous generator based direct current power generating system

A method of compensating for rotor position error of a rotor of a permanent magnet synchronous generator (PMG) that provides electrical power to a direct current (DC) power generating system, the method comprising:

• obtaining PMG phase voltages and resolver processed angular position output signals by a resolver-to-digital (R/D) converter of the DC power generating system when the PMG is driven by a prime mover;
• filtering the PMG phase voltages by a filter;
• sending the filtered PMG phase voltages to a digital signal processor (DSP) component including at least one computer processor and at least one computer readable storage medium;
• selecting a PMG fundamental phase voltage waveform from the filtered PMG phase voltages and by the at least one computer processor;
• converting a mechanical angle of a rotor into an electrical angle by the at least one computer processor of an electrical angle and frequency derivation component of the DC power generating system;
• aligning the electrical angle within the mechanical angle with a corresponding PMG fundamental phase voltage angle by adjusting offset to the electrical angle;
• storing a plurality of resolver error offset values associated with the electrical angle into a computer readable storage medium of the at least one computer readable storage medium;
• adding additional values to the compensation table by interpolating data between two corresponding resolver error offset values of the plurality of resolver error offset values by a computer processor of the at least one computer processor;
• and
• running the prime mover at a pre-determined speed before obtaining the PMG phase voltages;
• further comprising:
• feeding an excitation signal to a resolver rotor coil;
• feeding sinusoidal and cosine-shaped signals from respective coils of a resolver associated with a rotor of the PMG;
• deriving angular and speed values by the R/D converter;
• and
• feeding the angular and speed values to the DSP component before running the prime mover;
• wherein the resolver comprises a two-pole resolver;
• wherein the resolver is frameless;
• and
• wherein the PMG includes about twenty-eight poles.