Tubular electrical machines
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Accused Products
Abstract
A stator for a tubular electrical generator or motor has a substantially cylindrical inner surface containing a series of axially-spaced slots for receiving the coils of a stator winding. The stator is formed from a plurality of stacked annular laminations that define the slots and the inner surface. The laminations comprise circumferentially-spaced radial slits defining fingers that extend radially outwards from their radially inner edges. The slits and fingers reduce the overall eddy losses in the stator while permitting simple manufacture, simple assembly and high radial thermal conduction for good cooling. In an alternative embodiment, the laminations and their fingers may be replaced by layers of batons of similar radial extent to the laminations.
13 Citations
47 Claims
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1-30. -30. (canceled)
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31. A stator for a tubular electrical machine, the stator comprising:
a substantially cylindrical inner surface containing a series of axially-spaced slots for receiving coils of a stator winding, and a plurality of batons stacked together in axially successive layers such that radially inner edges of the batons in a first layer define the inner surface of the stator and radially inner edges of the batons in a second layer define a substantially cylindrical end surface of the axially-spaced slots. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A tubular electrical machine, comprising:
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a stator comprising a substantially cylindrical inner surface containing a series of axially-spaced slots for receiving coils of a stator winding, and a plurality of batons stacked together in axially successive layers such that radially inner edges of the batons in a first layer define the inner surface of the stator and radially inner edges of the batons in a second layer define a substantially cylindrical end surface of the axially-spaced slots, the stator winding having a series of coils received in the series of axially-spaced slots contained in the substantially cylindrical inner surface of the stator; and a translator located inside the stator and spaced apart from the substantially cylindrical inner surface of the stator by an air gap. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification