Photo Index - General Electric Co. - Model 20001, Type SA

Machinery Photo Index

Manufactured/Badged by:
General Electric Co.
Schenectady, NY

True Manufacturer:
General Electric Co., Schenectady, NY

Machine Specifications
Machine Class:	Metal Working Machinery
Machine Type:	Motor
Machine Size:	1/6 HP
Submitted By:	Carl Bukowsky

Machine Specifications
Description/Model:	Model 20001, Type SA
Date of Manufacturer:	1926
Serial Number:	3520905
Last Updated	4/26/2020 11:21:44 AM

Comments:

The General Electric Company Model 20001, Type SA, Frame 145, Form S1, 60 cycle, AC motor is rated to make 1/6 HP at 4.2 amps, running at 1725 rpm. The particular fractional HP AC motor design differs from conventional induction motors in that the secondary winding is stationary and the rotor is the primary element. The rotor shaft has two concentric rings that connect the rotor windings to input power through a set of spring loaded brushes that ride against these rotor rings. The 20001 Model Type S4 with Frame 145 features end bell designs that fully enclose the motor windings, built in the "protected type" construction which for such applications as washing machine, dish washers, potato peelers, and other machines that require protection against splashing water, etc. The Type SA Frame 137 has an open end bell design for better ventilation with lower operating temperature. The Type SD motor is the DC (direct current) version and it shares the same dimensions as the Type SA (alternating current)motors. (Source: General Electric Catalogue 6001, published 1921)

Photo 1:

Comments: The GE AC Induction motor installed on a 1926 Oliver Instruments Company Type 4 Die Filing Machine, in the original condition when purchased, Feb 2020. Notice a wick oiler (ft shaft housing, round cap, small hole in top) for adding lubricating oil.
Source: author

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Photo 2:

Comments: The restoration effort complete, all clean and freshly painted. The original GE motor badge has been stripped, re-painted, and a clear coat applied.
Source: author

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Photo 3:

Comments: The phenolic wiring access cover was repaired, added an internal strain relief clamp for power cord, and re-wired for three-wire UL power cord. Original design had no ground wire so a mouse hole was made in the cover to run ground wire to the cover mount
Source: author

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Photo 4:

Comments: Motor has two wick oilers that intersect at sleeve bearings, front & rear. New wicks were made from 100% cotton cord, secured in a long bundle by cotton thread, and then covered by a light felt outer shell, same as the originals.
Source: author

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Photo 5:

Comments: The GE motor primary windings, the rotor with the slip rings in the foreground, resting on top of motor secondary core. The induction motor uses a mechanical centrifical switch, mounted on the rotor behind the rings, to disconnect the starting windings w
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Photo 6:

Comments: The front side of GE motor when mounted to the Oliver Instruments Company Type 4 Die Filing Machine. Note the front wick oiler cap with the added ball oiler in the silver cap.
Source: author

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