Excitation system
AssigneeCummins Generator Technologies Limited
InventorsAnthony Spargo, Peethamparam Anpalahan
Life of this patent
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Abstract
An excitation system (15) is disclosed for providing excitation to a main rotating electrical machine (2). The excitation system comprises an exciter (50) and an auxiliary generator (52). The exciter and the auxiliary generator have separate stator cores (14, 18) and share a common rotor core (16). The common rotor (16) core may be located between the two stator cores (14, 18). This may help to optimize space, improve material usage and reduce the total rotating mass. A mounting arrangement for the common rotor core is also disclosed.
Claims20
An excitation system arranged to provide excitation to a main rotating electrical machine, the excitation system comprising:
- an exciter arranged to provide excitation to the main rotating electrical machine, the exciter comprising an exciter stator core;
- and
- a permanent magnet generator arranged to provide excitation to the exciter, the permanent magnet generator comprising a permanent magnet generator stator core separate from the exciter stator core;
- wherein:
- one of the permanent magnet generator and the exciter is nested inside the other;
- the exciter and the permanent magnet generator share a common rotor core, the common rotor core comprising a common back iron;
- the common rotor core is substantially annular in shape;
- exciter core windings are provided on one of a radially outwards side and a radially inwards side of the common rotor core;
- and
- permanent magnets are provided on another of the radially outwards side and the radially inwards side of the common rotor core.
A rotating electrical machine comprising a main machine and an excitation system, wherein the excitation system provides excitation to the main machine, the excitation system comprising:
- an exciter arranged to provide excitation to the main machine, the exciter comprising an exciter stator core;
- and
- a permanent magnet generator arranged to provide excitation to the exciter and the permanent magnet generator comprising a permanent magnet generator stator core separate from the exciter stator core;
- wherein:
- one of the permanent magnet generator and the exciter is nested inside the other;
- the exciter and the permanent magnet generator share a common rotor core, the common rotor core comprising a common back iron;
- the common rotor core is substantially annular in shape;
- exciter rotor windings are provided on one of a radially outwards side and a radially inwards side of the common rotor core;
- and
- permanent magnets are provided on another of the radially outwards side and the radially inwards side of the common rotor core.
A method of manufacturing an excitation system, the excitation system comprising an exciter for providing excitation to a main rotating electrical machine, the exciter comprising an exciter stator core, and a permanent magnet generator for providing excitation to the exciter, the permanent magnet generator comprising a permanent magnet generator stator core separate from the exciter stator core, wherein one of the permanent magnet generator and the exciter is nested inside the other, the method comprising:
- manufacturing a common rotor core shared by the exciter and the permanent magnet generator, the common rotor core comprising a common back iron, wherein the common rotor core is substantially annular in shape;
- providing exciter rotor windings on one of a radially outwards side and a radially inwards side of the common rotor core;
- and
- providing permanent magnets on another of the radially outwards side and the radially inwards side of the common rotor core.
Dependencies are inferred from the claim text.