# US 10,122,306 B2 · Electric power generating system with a permanent magnet generator and combination of active and passive rectifiers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,306 B2 - Document ID: US10122306B2 - Status: Granted - Kind: B2 - Application number: 15/453,350 - Filed: 2017-03-08 - Published: 2018-09-13 - Granted: 2018-11-06 - Earliest claimed: 2017-03-08 - Assignees: Hamilton Sundstrand Corporation - Applicants: Hamilton Sundstrand Corporation - Inventors: Gregory I. Rozman; Steven J. Moss; Jacek F. Gieras - Web page: https://patentgrep.com/patent/US10122306B2 ## CPC - H02M 7/04: by static converters - H02M 1/14: Arrangements for reducing ripples from DC input or output - H02P 9/00: Arrangements for controlling electric generators for the purpose of obtaining a desired output - H02P 9/48: Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle (H02P9/04 - H02P9/46 take precedence) - H02P 2103/20: of the synchronous type - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS ## Abstract An electric power generating system (EPGS) may comprise a permanent magnet generator (PMG) comprising a rotor comprising a permanent magnet and a stator comprising a first armature winding configured to output a first three-phase voltage, and a second armature winding configured to output a second three-phase voltage. The EPGS may further comprise a passive rectifier configured to rectify the first three-phase voltage, an active rectifier configured to rectify the second three-phase voltage, and an active rectifier controller, wherein the active rectifier is controllable in response to a current reference received by the active rectifier controller. An EPGS may comprise a tunable notch filter configured to filter a first DC voltage and/or a DC output voltage, in accordance with various embodiments. ## Claims ### Claim 1 An electric power generating system (EPGS) comprising, a permanent magnet generator (PMG) comprising: a rotor; a stator comprising: a first armature winding configured to output a first three-phase voltage; and a second armature winding configured to output a second three-phase voltage; a passive rectifier configured to rectify the first three-phase voltage received from the first armature winding; an active rectifier configured to rectify the second three-phase voltage received from the second armature winding, wherein the passive rectifier is configured to output a first direct current (DC) voltage and the active rectifier is configured to output a second DC voltage; and a tunable notch filter comprising a capacitor and a variable inductor, the tunable notch filter configured to filter at least one of the first DC voltage and the second DC voltage, the tunable notch filter tunable in response to a rotational velocity of the rotor; and an auto-tuning notch filter control, comprising: a frequency detector; a current regulator; a pulse width modulator; and an H-bridge, wherein the auto-tuning notch filter control detects a rotational frequency of the rotor and regulates a current through a secondary winding of the variable inductor. ### Claim 2 (depends on 1) The EPGS of claim 1, wherein the tunable notch filter is connected across the passive rectifier and configured to filter the first DC voltage. ### Claim 3 (depends on 1) The EPGS of claim 1, wherein the tunable notch filter is connected across both the passive rectifier and the active rectifier and configured to filter a DC output voltage comprising a sum of at least the first DC voltage and the second DC voltage. ### Claim 4 (depends on 3) The EPGS of claim 3, further comprising: a voltage sensor electrically configured to sense the DC output voltage; a voltage regulator in electronic communication with the voltage sensor and configured to receive a sensor signal from the voltage sensor; and an active rectifier controller configured to receive a current reference signal from the voltage regulator, wherein the active rectifier is controllable in response to the current reference signal received by the active rectifier controller. ### Claim 5 (depends on 1) The EPGS of claim 1, wherein the secondary winding of the variable inductor is configured to receive the current from a power supply via the H-bridge; and the auto-tuning notch filter control utilizes a table look-up to determine the current based upon the rotational frequency of the rotor. ### Claim 6 (depends on 1) The EPGS of claim 1, wherein the variable inductor is mechanically coupled to the stator. ### Claim 7 (depends on 6) The EPGS of claim 6, wherein at least a portion of the variable inductor is disposed within a plurality of slots of the stator. ### Claim 8 (depends on 1) The EPGS of claim 1, further comprising a current sensor connected in series with the secondary winding of the variable inductor and configured to send a current signal to the current regulator. ### Claim 9 A method for generating electric power, comprising: rotating a rotor of a permanent magnet generator; generating, via a first stator armature winding, a first three-phase voltage in response to the rotating; rectifying, via a passive rectifier, the first three-phase voltage into a first DC voltage; generating, via a second stator armature winding, a second three-phase voltage in response to the rotating; rectifying, via an active rectifier, the second three-phase voltage into a second DC voltage; controlling, via an active rectifier controller, the active rectifier; filtering, via a tunable notch filter, at least one of the first DC voltage and the second DC voltage, the tunable notch filter comprising a variable inductor and a capacitor; detecting, via an autonomous notch filter control, a rotational frequency of the rotor, wherein the tunable notch filter is tunable in response to a rotational frequency of the rotor; and regulating, by the autonomous notch filter control, a current through a secondary winding of the variable inductor, wherein the auto-tuning notch filter control comprises: a frequency detector; a current regulator; a pulse width modulator; and an H-bridge. ### Claim 10 (depends on 9) The method of claim 9, further comprising: sending, by a voltage sensor, a sensor signal to a voltage regulator; and sending, by the voltage regulator a current reference signal to the active rectifier controller, wherein the controlling the active rectifier regulates the second DC voltage in response to the current reference signal.