Cooling of electrical machines
AssigneeGeneral Electric Renovables Espana, S.L.
InventorsSadeo Ramtahal, Andrew Thomas Cross, Rinaldo Luigi Miorini, Julio Cesar Urresty, Cesar Muñiz Casais, Lakshminarayana Kanakamedala
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Abstract
An electrical machine comprising a rotor 20, a stator 30 and an air gap 40 arranged between the rotor 20 and the stator 30 is provided. The stator 30 or rotor 20 comprises a plurality of electrical coils 90, wherein one or more of the electrical coils 90 carry a heat sink, wherein the heat sink is attached to the electrical coil with a thermally conductive material. Methods for modifying a temperature distribution of a stator in an electrical machine are also provided.
Claims14
An electrical machine, comprising:
- a rotor and a stator;
- an air gap defined between the rotor and the stator;
- and
- one of the stator or the rotor comprising a plurality of electrical coils,
- wherein at least one electrical coil of the plurality of coils comprises a heat sink to dissipate heat to the air gap,
- wherein the heat sink is attached to the at least one electrical coil with a thermally conductive material,
- wherein a temperature distribution of the at least one electrical coil is more homogeneous with the heat sink attached than without the heat sink attached and a difference between a highest temperature and a lowest temperature of the at least one electrical coil is less than 20° C. with the heat sink attached.
A method for modifying a temperature distribution of an electrical coil in an electrical machine, the method comprising:
- operating the electrical machine;
- measuring a temperature distribution of the electrical coil while operating the electrical machine;
- and
- attaching a heat sink to a selected area of a surface the electrical coil to increase a contact surface with an air flow around the electrical coil,
- wherein the temperature distribution of the electrical coil is more homogeneous after attaching the heat sink than before attaching the heat sink and a difference between a highest temperature and a lowest temperature of the electrical coil is less than 20° C. after attaching the heat sink.
Dependencies are inferred from the claim text.