Cooling of electrical machines
First Claim
Patent Images
1. A method of cooling a stator of an air gap electrical machine, comprising the steps of:
- passing a coolant through channels at least partly defined by non-magnetic material supports located between, and in contact with, adjacent linear conductor portions of coils comprising a stator winding of the machine and defining the channels externally of the supports.
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Abstract
A stator for a high power density air gap electrical machine comprises an outer annular laminated iron stator core and a stator winding comprising a plurality of coils having linear conductor portions extending substantially parallel to a longitudinal axis of the machine. Support teeth for the coils are fabricated from a non-magnetic material, with each support being interposed between two adjacent ones of the linear conductor portions of the coils. The supports not only supplement the mechanical strength of the winding but also define channels for the flow of coolant to extract heat from the coils.
66 Citations
25 Claims
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1. A method of cooling a stator of an air gap electrical machine, comprising the steps of:
- passing a coolant through channels at least partly defined by non-magnetic material supports located between, and in contact with, adjacent linear conductor portions of coils comprising a stator winding of the machine and defining the channels externally of the supports.
- View Dependent Claims (2)
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3. A stator for an air gap electrical machine, the stator comprising:
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a) an outer annular laminated stator core coaxial with a longitudinal axis of the machine, b) a stator winding inside the stator core and comprising a plurality of coils having linear conductor portions extending parallel to the longitudinal axis and stacked radially of the longitudinal axis, and c) a plurality of supports for the coils, the supports extending along the longitudinal axis alongside the linear conductor portions of the coils, the supports also tapering radially of the longitudinal axis to make intimate contact with the stacked linear conductor portions, the supports being fabricated from a non-magnetic material, and each support being interposed between, and in contact with, two adjacent ones of the linear conductor portions of the coils, at least some of the supports defining channels extending along the longitudinal axis for a flow of a coolant therealong, thereby to extract heat from the coils. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An electrical motor or generator having a stator comprising:
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a) an outer annular laminated stator core coaxial with a longitudinal axis of the motor or generator, b) a stator winding inside the stator core and comprising a plurality of coils having linear conductor portions extending parallel to the longitudinal axis and stacked radially of the longitudinal axis, and c) a plurality of supports for the coils, the supports extending along the longitudinal axis alongside the linear conductor portions of the coils, the supports also tapering radially of the longitudinal axis to make intimate contact with the stacked linear conductor portions. the supports being fabricated from a non-magnetic material, and each support being interposed between, and in contact with, two adjacent ones of the linear conductor portions of the coils, at least some of the supports defining channels extending along the longitudinal axis for a flow of a coolant therealong, thereby to extract heat from the coils.
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16. A stator for an air gap electrical machine, the stator comprising:
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a) an outer annular laminated stator core coaxial with a longitudinal axis of the machine, b) a stator winding inside the stator core and comprising a plurality of coils having linear conductor portions, and c) a plurality of supports for the coils, the supports extending alongside the linear conductor portions of the coils, the supports being fabricated from a non-magnetic material, and each support being interposed between, and in contact with, two adjacent ones of the linear conductor portions of the coils, at least some of the supports defining channels for a flow of a coolant therealong, the coolant flow channels being defined externally of the supports, thereby to extract heat from the coils. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A stator for an air gap electrical machine, the stator comprising:
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a) an outer annular laminated stator core coaxial with a longitudinal axis of the machine, b) a stator winding inside the stator core and comprising a plurality of coils having linear conductor portions, the stator winding having two layers of the linear conductor portions of the coils, the two layers comprising respectively a radially inner layer and a radially outer layer; and
c) a plurality of supports for the coils, the supports extending alongside the linear conductor portions of the coils, the supports being fabricated from a non-magnetic material, and each support being interposed between, and in contact with, two adjacent ones of the linear conductor portions of the coils, at least some of the supports defining channels for a flow of a coolant therealong, thereby to extract heat from the coils, the two layers of the stator winding being keyed together at a castellated interface between two corresponding layers of the supports to provide mechanical strength. - View Dependent Claims (23)
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24. A stator for an air gap electrical machine, the stator comprising:
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a) an outer annular laminated stator core coaxial with a longitudinal axis of the machine, b) a stator winding inside the stator core and comprising a plurality of coils having linear conductor portions, and c) a plurality of supports for the coils, the supports extending alongside the linear conductor portions of the coils, the supports being fabricated from a non-magnetic material, and each support being interposed between, and in contact with, two adjacent ones of the linear conductor portions of the coils, at least some of the supports defining channels for a flow of a coolant therealong, thereby to extract heat from the coils, the stator winding being keyed to the stator core at a castellated interface therebetween, and radially outer ends of at least some of the supports adjacent the stator core extending radially beyond the linear conductor portions of the coils into matching axially extending grooves provided in the stator core.
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25. A stator for an air gap electrical machine, the stator comprising:
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a) an outer annular laminated stator core coaxial with a longitudinal axis of the machine, b) a stator winding inside the stator core and comprising a plurality of coils having linear conductor portions, and c) a plurality of supports for the coils, the supports extending alongside the linear conductor portions of the coils, the supports being fabricated from a non-magnetic material, and each support being interposed between, and in contact with, two adjacent ones of the linear conductor portions of the coils, at least some of the supports defining channels for a flow of a coolant therealong, thereby to extract heat from the coils, the supports comprising a fiber-reinforced composite material.
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Specification