DYNAMOELECTRIC MACHINE
First Claim
2. The dynamoelectric machine of claim 1 wherein the particulate material is comprised of granular refractory material having an A.F.S. grain fineness number greater than 45.
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Accused Products
Abstract
Composite structure includes winding support with windings accommodated thereon and a housing means that does not include a metal case or shell and that does include a substantially rigid primary structural member formed of an interstitial mass of inert particulate material. Adhesive material occupies interstices of interstitial mass and bonds inert particles together and to remainder of the structure. Improved composite structure exhibits enhanced structural integrity, corrosion resistance and, even when employing refractory material such as sand as the particulate material, exhibits measurably improved heat dissipation characteristics. Composite structure also provides improved protection for winding terminations and terminals. Also disclosure of making composite structures including a particulate interstitial mass and dynamoelectric machines including such structures.
54 Citations
16 Claims
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2. The dynamoelectric machine of claim 1 wherein the particulate material is comprised of granular refractory material having an A.F.S. grain fineness number greater than 45.
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3. The dynamoelectric machine of claim 1 wherein (said) housing means includes means for directing a cooling medium through the dynamoelectric machine thereby to further aid in the effective dissipation of heat from the stator assembly generated during operation of the dynamoelectric machine.
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4. The dynamoelectric machine of claim 1 wherein (said) rotor assembly is mounted in spaced relation to the stator assembly and forms an axially extending air gap therewith and the dynamoelectric machine further comprises an end frame secured to (said) housing means;
- said end frame defining a number of spaced apart openings in axial alignment with said air gap to provide an unobstructed path between the air gap and said openings in the end frame, said openings being sufficiently large to permit access to the air gap for removing shim means therefrom during assembly of the dynamoelectric machine components.
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5. A dynamoelectric machine comprising a stator assembly;
- a movable assembly including a centrally disposed shaft;
at least one bearing for mounting the assemblies for relative motion with the shaft supported by the bearing and extending from the assemblies; and
an impact resistant rigid mass of inert particulate material secured together and to the stator assembly by a resinous material to form a self-supporting substantially rigid housing member having no perIpheral metallic covering therearound, said self-supporting substantially rigid housing member structurally interconnecting the at least one bearing and stator assembly, and providing protection for the stator assembly from impact loads that may be applied to the dynamoelectric machine without need for the peripheral metallic coverinG;
said particulate material comprising granular refractory material having an A.F.S. grain fineness number greater than 45.
- a movable assembly including a centrally disposed shaft;
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6. The dynamoelectric machine of claim 5 wherein said rigid mass comprises from about 65 to about 80 percent by weight of inert particulate material and from about 20 to about 35 percent by weight of resinous material.
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7. The dynamoelectric machine of claim 5 wherein the stator assembly includes a laminated magnetic core, the movable assembly is mounted in spaced relation to the stator assembly and forms an axially extending air gap therewith, said housing member has at least one passage formed therein in communication with the magnetic core, and the dynamoelectric machine further comprises an end frame secured to the stator assembly, and an electrically conductive member disposed in the passageway to establish a conductive path between the magnetic core and end frame.
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8. The dynamoelectric machine of claim 5 wherein the color of (said) substantially rigid housing member is primarily determined by the particulate material.
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9. The dynamoelectric machine of claim 5 wherein the color of (said) substantially rigid housing member is primarily determined by the resinous material.
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10. In a dynamoelectric machine comprising a stator assembly;
- a movable assembly including a shaft, means including at least one bearing for mounting the assemblies for relative motion with the shaft extending from the assemblies, and a substantially rigid housing member;
the improvement comprising said housing member being formed of an impact resistant substantially rigid mass comprising from about 65 to about 80 percent by weight of inert particulate material and from about 20 to about 35 percent by weight of resinous material;
said inert particulate material comprising at least about 50 percent by weight of particles smaller than 100 mesh size, with said particles being held together and secured to the stator assembly by the resinous material to form a self-supporting substantially rigid housing member having no peripheral metallic covering therearound, said self-supporting substantially rigid housing member structurally interconnecting the at least one bearing means and stator assembly, and providing protection for the stator assembly from impact loads that may be applied to the dynamoelectric machine without need for the peripheral metallic covering.
- a movable assembly including a shaft, means including at least one bearing for mounting the assemblies for relative motion with the shaft extending from the assemblies, and a substantially rigid housing member;
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11. The dynamoelectric machine of claim 10 wherein the resinous material is a polymer formed from polyester and styrene.
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12. The structure of claim 10 further including a bearing support adhesively secured to the rigid housing member.
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13. A composite structure for an electric motor having a stator, a rotor supported on a shaft, and at least one bearing supporting the shaft with the shaft extending from the motor, said composite structure comprising:
- a magnetic core;
at least one electrically conductive winding accommodated on the magnetic core; and
a housing without a metallic covering for receiving at least a part of the at least one winding;
said housing comprising an interstitial mass of particles packed against and secured to each other and packed against and secured to said part of the at least one winding, to form a substantially rigid member with at least 50 percent by weight of the particles having a particle size of from about 40 to 100 mesh, thereby to protect at least said part of the at least one winding from mechanical damage and to dissipate therefrom heat produced during excitation of the at least one winding without need for the metallic covering.
- a magnetic core;
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14. The composite structure of claim 13 including at least one terminal having a first portion thereof electrically connected to the winding and embedded in the interstitial mass of particles, and a second portion extending out of the interstitial mass of particles and being exposed for connection to a source of power.
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15. The composite struCture of claim 13 wherein said substantially rigid member comprises from about 65 to about 80 percent by weight of sand particles and from about 20 to about 35 percent by weight of resinous material securing the sand particles together.
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16. The composite structure of claim 13 wherein the particles comprise a particulate refractory material having an A.F.S. grain fineness number greater than 45.
Specification