Brushless starter-generator with independently controllable exciter field
February 22, 2026. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3676764 3823357 3908161 Quadrature axis field brushless exciter Starter motor-alternator apparatus Aircraft engine starting with synchronous ac generator System and method employing a digital computer for automatically synchronizing a gas turbine or other electric power plant generator with a power system Starter-generator for engines Starter generator system with two stator exciter windings Inverter operated turbine engine starting system InventorsAssigneeApplicationNo. 11360116 filed on 02/22/2006US Classes:322/59, With excitation winding and/or circuit control322/29, Speed or frequency of generator322/37, Electrical conditions in circuit other than that of generator being controlled322/46, Combined permanent magnet and wound field structure290/31, Starting and generating dynamo318/718, Induced voltage in field winding322/10, WITH PHYSICAL STARTING AND/OR STOPPING OF THE GENERATOR322/68, Short circuiting of field winding290/52, TURBOGENERATORS290/1CDrive gearingExaminersPrimary: Ponomarenko, NicholasAttorney, Agent or FirmInternational ClassH02P 9/44AbstractA starter-generator system supplies a controllable torque to a gas turbine engine, to thereby assist in starting the gas turbine engine, by independently controlling excitation frequency and/or voltage magnitude. The starter-generator includes a multi-phase exciter stator, a rotationally mounted multi-phase exciter rotor, a multi-phase main stator, a rotationally mounted multi-phase main rotor, and an exciter controller. The rotationally mounted multi-phase exciter rotor has a plurality of exciter rotor windings wound thereon that, upon excitation thereof with a rotating electromagnetic exciter flux generated by the exciter stator, have non-rectified excitation currents induced therein. The rotationally mounted multi-phase main rotor has a plurality of main rotor windings wound thereon that are electrically connected to receive the non-rectified excitation currents induced in the exciter rotor windings and that, upon excitation thereof with a rotating electromagnetic flux and in response to the non-rectified excitation currents supplied thereto, have currents induced therein that generate a main rotor torque to thereby cause the multi-phase main rotor and the multi-phase exciter rotor to rotate. The exciter controller is electrically coupled to at least the exciter stator and is configured to selectively supply the electrical excitation thereto, to thereby selectively control the generated main rotor torque.Field of SearchAUTOMATIC CONTROL OF GENERATOR OR DRIVING MEANSPlural conditions Including an electrical condition Plural electrical conditions Speed or frequency of generator Electrical conditions in circuit other than that of generator being controlled Combined permanent magnet and wound field structure With excitation winding and/or circuit control Substitute or auxiliary starting source of excitation With armature or primary circuit control | |
