# US 10,483,888 B2 · Permanent magnet synchronous generator based direct current power generating system

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- Number: US 10,483,888 B2
- Document ID: US10483888B2
- Status: Granted
- Kind: B2
- Application number: 16/053,097
- Filed: 2018-08-02
- Published: 2018-11-29
- Granted: 2019-11-19
- Earliest claimed: 2015-12-18
- Assignees: Hamilton Sundstrand Corporation
- Applicants: Hamilton Sundstrand Corporation
- Inventors: Gregory I. Rozman; Steven J. Moss; Andrew Baker
- Web page: https://patentgrep.com/patent/US10483888B2

## CPC

- H02P 9/009: {Circuit arrangements for detecting rotor position}
- B60L 50/12: using AC generators and DC motors
- H02P 6/16: Circuit arrangements for detecting position
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES

## Abstract

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 including obtaining PMG phase voltages and resolver processed angular position output when the PMG is driven by a prime mover. Once obtained, a PMG fundamental phase voltage waveform is selected by eliminating higher order harmonics. A mechanical angle of the rotor is then converted into an electrical angle, then the electrical angle is aligned within the mechanical angle with a corresponding PMG fundamental phase voltage angle by adjusting offset to the electrical angle. After alignment, a plurality of resolver error offset values associated with the electrical angle are stored and additional values to the compensation table are added by interpolating data between two corresponding resolver error offset values of the plurality of resolver error offset values.

## Claims

### Claim 1

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.