Derek Warnecke Posted February 19, 2023 Share Posted February 19, 2023 I wanted to highlight an in-progress restoration of an electrically-reversible 1942 Emerson 87641-AL "Roundnose" ceiling fan. The amount of labor involved in hand-winding a reversible shaded pole motor is considerable, especially for a 28-pole motor, and I can't help but admire what I see as I disassemble the motor housing for restoration. Each motor pole has a pair of wound shading coils. Each CW and CCW set is connected in series and shorted via a SPDT toggle to short either the CW or CCW set to bias the motor to run either direction. The rotor is a real tour-de-force of casting and machining expertise. There is an inner shaft with oil grooves machined for CW rotation and an outer shaft machined for CCW rotation with a corresponding sleeve on the stator side. Very cool! 5 Quote Link to comment Share on other sites More sharing options...
Derek Warnecke Posted February 26, 2023 Author Share Posted February 26, 2023 Everything has been painted and is ready for assembly today. Run video to follow... Quote Link to comment Share on other sites More sharing options...
Derek Warnecke Posted February 27, 2023 Author Share Posted February 27, 2023 (edited) All finished and running great in both directions! Very little vibration from the motor. Edited February 27, 2023 by Derek Warnecke 3 Quote Link to comment Share on other sites More sharing options...
Patrick Ray Posted February 27, 2023 Share Posted February 27, 2023 Beautiful work Derek! 1 Quote Link to comment Share on other sites More sharing options...
Derek Warnecke Posted April 9, 2023 Author Share Posted April 9, 2023 All finished! It looks great, and runs like a top. I strobed out the speeds at 207/155/123 RPM. A nice factory spread for an antique. 3 Quote Link to comment Share on other sites More sharing options...
Patrick Ray Posted April 10, 2023 Share Posted April 10, 2023 Very nice Derek! Runs so smooth! 1 Quote Link to comment Share on other sites More sharing options...
Derek Warnecke Posted April 17, 2023 Author Share Posted April 17, 2023 On 4/9/2023 at 8:09 PM, Patrick Ray said: Very nice Derek! Runs so smooth! Thank you! This model has blade pitch for days and really moves a great amount of air, even on Low speed. Really glad to be able to "rescue" this fan from eBay and give it a proper restoration. I hope to do the same to a late '30s 87641-AK PSC reversible Roundnose that I won the high bid on yesterday. 1 Quote Link to comment Share on other sites More sharing options...
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