Structure for attaching a permanent magnet to a rotating shaft
AssigneeSundstrand Corporation
InventorPhillip S. Linscott, Jr.
Life of this patent
Estimating the term…
Abstract
In order to minimize stresses on a circular rotatable permanent magnet attached to a shaft in a dynamoelectric machine, the shaft of the machine is provided with a circular support portion having an outer supporting surface and a shoulder at one end wherein a shouldered ring secured to the support portion cooperates with the shoulder on the support member to axially retain the magnet on the shaft. Rotational slippage of the magnet on the shaft is prevented by a pin which is engaged with both the magnet and the shouldered ring or, alternatively, by a key inserted between the support portion and the magnet. A flexible material is interposed between the supporting surface and the magnet in order to reduce vibration and motion of the magnet on the shaft.
Claims9
A rotatable structure comprising:
- a shaft;
- an annular magnet;
- a generally circular support portion integral with the shaft having an outer supporting surface with a diameter less than the inside diameter of the permanent magnet and additionally including a shoulder portion effective to restrain axial movement of the permanent magnet in a first axial direction;
- a shouldered ring having a shoulder effective to restrain axial movement of the permanent magnet in a second axial direction;
- means for securing said shouldered ring to said support portion;
- at least one securing member engaged with the permanent magnet to prevent the rotation of the magnet with respect to the shaft;
- and
- a flexible material interposed between the said supporting surface and the magnet.
A rotatable magnet structure, comprising:
- a rotary shaft having an enlarged central magnet support portion including a peripheral magnet support surface and a shoulder at one end of the support surface for limiting axial movement of a magnet on the support surface;
- an annular magnet disposed on the shaft support portion;
- a retaining ring on the shaft having one end engaging the end of the enlarged shaft support portion remote from said shoulder;
- a peripheral magnet support surface on the retaining ring and an annular shoulder on the retaining ring opposed to the shoulder on the shaft for limiting axial movement of the magnet on the shaft;
- means securing the retaining ring on the shaft with the magnet held between the shoulder;
- and
- a flexible material interposed between said magnet support surfaces and said magnet.
Dependencies are inferred from the claim text.