Method of making a dimensionally stable commutator
AssigneeAirscrew Howden Limited
InventorRobert Arthur Letts
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Abstract
This invention describes a method of making a commutator, for a high speed electric machine, (1) embedding a number of conductive bars in insulating plastics material to form a moulded commutator (2) the moulded commutator defining at least one annular seat (3) placing a ring of high tensile material on the seat whereby to stress the ring in tension and thereby apply a radially inward load to each bar which is greater than the centrifugal force on the bar at maximum running speed. The invention also includes a commutator made by this method.
Claims7
A method of making a high speed commutator, comprising embedding a number of conductive bars in insulating plastics material to form a moulded commutator while simultaneously providing the moulded commutator with at least one annular seat, and then subsequently placing a ring of high tensile material on the seat, stressing the ring in tension and thereby applying a radially inward load to each conductive bar which is three times greater than the centrifugal force on the bar at maximum running speed.
A method of making a commutator, comprising
- 1. embedding a number of conductive bars in insulating plastics material to form a moulded commutator the bars having recesses in their ends which are circumferentially aligned
- 2. the mouled commutator defining and annular seat at each end within the recesses
- 3. expanding a ring of high tensile material
- 4. placing said ring on each seat whereby to stress the ring in tension and thereby apply a radially inward load to each bar which is greater than three times the centrifugal force on the bar at maximum running speed.
Dependencies are inferred from the claim text.