US Patent: 1,852,829
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| Dynamo electric machine
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Patentee:
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| Alfred F. Welch (exact or similar names) - Fort Wayne, IN |
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Patent Dates:
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| Applied: |
Mar. 25, 1930 |
| Granted: |
Apr. 05, 1932 |
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Jeff Joslin
Vintage Machinery entry for General Electric Co.
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Description: |
| The goal of this patent is to make a stator that is reliably quiet in operation. Previous motor designs were claimed to be noisy due to slight variations in the air gap. The innovation is to tightly bond a shell to the laminated stator so as to prevent the laminations from vibrating. This "shell" is the metal band forming the center part of the motor casing. Before assembly, the band is coated with a "phenolic condensation product" the band is wrapped around the stator, and then the edges of the band are folded inward so that the edges press firmly against the edges of the stator. The phenolic condensate then solidifies and the band and stator form a unitary mass, which can be verified by the clear ringing tone produced when the assembly is lightly struck, and will be silent in operation. Without the condensate and the folded edges, the assembly will instead produce a clattering sound when struck, and the assembly will make noise during operation. "Phenolic condensation product" refers to phenol-formaldehyde adhesives, which are industrial adhesives that are inexpensive, strong, stable, and heat-resistant. They are commonly used in gluing together the layers in plywood. |
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