Method for encapsulating field windings of rotary electric machines
AssigneeThe P.D. George Company
InventorFrancis L. George, Jr.
Life of this patent
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Abstract
It is generally known that the most common reason for replacing rotary electric machines is failure of field windings. Vibrations and primary overheating of field windings is the main reason for motor and generator repair. Consequently field windings have been fan cooled, externally ventilated, and totally enclosed. To solve this failure problem stators have been completely encapsulated, drip coated, and entirely coated. But all of these procedures are subject to certain disadvantages. The method and means herein overcome such disadvantages. Means are provided for embedding in a solid material field windings of stators of rotary electric machines in order to insulate and cool electric machines in which the stators are employed.
Claims25
A method for insulating stators of rotary electric machines having field winding-carrying stator cores with central cylindrical bores for rotors, the face of the cylindrical bores having channels for holding the field windings, the field windings looped outside the channels to form top and bottom field windings, the insulating method comprising the steps of:
- placing the stator in an open-ended sleeve adapted to form a cylinder to surround the field windings;
- closing one of the open ends of the sleeve;
- placing the sleeve in an upright position with the open end up;
- pouring a solidifying vehicle into the stator bore;
- inserting in the stator bore a cylindrical piston adapted to slidably fit in the stator bore so that the piston and the sleeve form an annular space accommodating the field windings;
- and
- forcing the piston into the stator bore to force the vehicle into the annular space throughout the bottom field windings and up the channels to cover the top field windings so that the field windings are encapsulated.
A method of insulating stators of rotary electric machines having a stator core carrying field windings and having a central bore, the face of the cylindrical bores having channels for holding the field windings, the insulating method comprising the steps of:
- placing the stator in an open ended sleeve forming a cylinder around the field windings of the stator;
- closing one of the open ends of the sleeve;
- introducing a solidifying vehicle into the stator bore;
- inserting in the stator bore a cylindrical piston adapted to slidably fit in the stator bore so that the piston and the sleeve form an annular space accommodating the field windings of the stator;
- and
- exerting pressure on the solidifying vehicle to drive the vehicle into the annular space throughout the bottom field windings and up the field windings channels to cover the top field windings, so that the field windings are encapsulated.
Dependencies are inferred from the claim text.