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US 12,537,426 B2Granted
Electrical machine and method of operating electrical machine
AssigneeGE Aviation Systems LLC
InventorsSuresh Babu Kamparaju, Balamurugan Sridharan, Shubham Sharma, Xiaochuan Jia
Life of this patent
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Abstract
An electrical machine comprising a rotatable shaft; an induction generator mechanically coupled to the rotatable shaft and defining a power output connectable with an electrical load, wherein the power output defines a desired constant voltage output; a converter electrically connected with the power output; and a controller connected to the converter, the controller configured to at least one of provide supplemental power at the power output or absorb excess power at the power output.
Claims19
An electrical machine, comprising:
- a rotatable shaft;
- an induction generator mechanically coupled to the rotatable shaft and defining a power output connectable with an electrical load, wherein the power output defines a desired constant voltage output;
- a converter electrically connected with the power output;
- a power storage device electrically connected to the converter, the power storage device including a battery, a capacitor, or a battery and a capacitor;
- a permanent magnet generator (PMG) mechanically coupled to the rotatable shaft and electrically connected to the induction generator and the power storage device;
- and
- a controller connected to the converter, the controller configured to:
- cause the PMG, at least indirectly via the power storage device, to provide an initial excitation current to the induction generator during an initial phase of operating the induction generator;
- in response to determining a variance from the desired constant voltage output, at least one of provide supplemental power at the power output to raise the power output to the desired constant voltage output or absorb excess power at the power output to lower the power output to the desired constant voltage output;
- and
- electronically disconnect the PMG from at least one of the power storage device or the convertor after the initial phase.
8 more elements
An electrical machine, comprising:
- a rotatable shaft;
- an induction generator mechanically coupled to the rotatable shaft and defining a power output connectable with an electrical load, wherein the power output defines a desired constant voltage output;
- a converter electrically connected with the power output;
- a power storage device electrically connected to the converter, the power storage device including a battery, a capacitor, or a battery and a capacitor;
- a permanent magnet generator (PMG) mechanically coupled to the rotatable shaft and electrically connected to the induction generator and the power storage device;
- and
- a controller connected to the converter, the controller configured to:
- cause the PMG, at least indirectly via the power storage device, to provide an initial excitation current to the induction generator during an initial phase of operating the induction generator;
- maintain the desired constant output voltage via operating the converter in (i) a first mode to provide, from the power storage device, supplemental power at the power output, and (ii) a second mode to absorb excess power at the power output;
- and
- to electronically disconnect the PMG from at least one of the power storage device or the convertor after the initial phase.
8 more elements
A method of operating an electrical machine, the method comprising:
- rotating a shaft coupled with an induction generator above a synchronous speed of the induction generator;
- providing current from an output of the induction generator to a power output;
- maintaining an electrical characteristic at the power output via a controller selectively operating an electrical converter in (i) a first mode to provide supplemental power to the power output from a power storage device, and (ii) a second mode to absorb power from the power output;
- operating a permanent magnet generator (PMG) to provide power to the electrical convertor during an initial phase, the permanent magnet generator being coupled to the shaft;
- and
- electrically disconnecting the PMG from the electrical converter after the initial phase.
3 more elements
Dependencies are inferred from the claim text.