Electric machine rotor sleeve
AssigneeRolls-Royce Electrical Norway AS
InventorJørg Høyland
Life of this patent
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Abstract
A rotor sleeve (46) for a rotor (29) of an electric machine (28). The sleeve comprises a plurality of layers (66a, 66b) of carbon fibre reinforced polymer, each layer (66a, 66b) comprising fibres (68) oriented substantially 90° to a rotational axis (X) and at least one layer (72a) of fibres (74) having a lower modulus of elasticity provided between layers (66a, 66b) of carbon fibre reinforced polymer. The lower modulus of elasticity fibres (74) are oriented between 50° and 75° relative to the rotational axis (X).
Claims16
A rotor sleeve for a rotor of an electric machine, the rotor sleeve defining a rotational axis and comprising:
- a plurality of first layers of carbon fibre reinforced polymer, each first layer comprising fibres oriented between 89° and 90° to the rotational axis;
- at least one second layer of fibres comprising one or more of glass fibre, aramid, ultra-high molecular weight polyethylene, nylon or poly(p-phenylene-2,6-benzobisoxaole) (PBO) within a matrix material, wherein:
- the at least one second layer is provided between two layers of the plurality of first layers,
- the fibres of the plurality of first fibers have a higher modulus of elasticity than the fibres of the at least one second layer, and
- the fibres of the at least one second layer are oriented between 50° and 75° relative to the rotational axis.
A method of manufacturing a sleeved rotor of an electric machine, the method comprising:
- providing a first layer of carbon fibre filaments aligned substantially 90° relative to a rotational axis;
- providing a second layer of fibre filaments comprising one or more of glass fibre, aramid, ultra-high molecular weight polyethylene, nylon or poly(p-phenylene-2,6-benzobisoxaole) (PBO) within a matrix material, the fibers having a lower modulus of elasticity than the carbon fibre filaments wound around the first layer of carbon fibre filaments;
- and
- providing a third layer of carbon fibre filaments around the second layer of fibre filaments aligned substantially 90° to the rotational axis;
- wherein
- the fibres of the first layer and the third layer have a higher modulus of elasticity than the fibres of the second layer, and
- the fibres of the second layer are oriented between 50° and 75° relative to the rotational axis.
Dependencies are inferred from the claim text.