a website collaboration between Science Service and the Smithsonian Institution

1935 - smallest electric motor in the world between two house flies


CD 1966052 E&MP31.005

Electric Motors

June 1935

Thus far the motor of the American, E. Kahn, weighing 7 grams, was considered the smallest electric motor in the world. Then there is the motor constructed by the Kiev school-boy Victor Nikitashenko, which weighs less than 1.6 grams, and the motor of the Kirov school- boy, Zhenya Malov, which weighs 1.4 grams.

Recently, however, the 21-year-old student Yuri Yeremin, of Moscow, established a new record by constructing an electric motor which weighs but 0.37 grams. It consists of 31 parts. The magnetic parts of the motor are made of tin, the current-carrying parts of brass and all insulating parts and the pulleys of ebonite. The diameter of the armature is 4 mm. The compound winding consists of 250 wire windings. The armature has 380 windings of the same wire, 0.05 mm in diameter. The metallic parts of the motor are fixed to its celluloid base by aluminum rivets.

This smallest of motors is put into action by a pocket battery of four volts or by the regular city electric current through a bell transformer.

Yuri Yeremin is a student of the Moscow Institute for Non-Ferrous Metals. He built his minute motor in 10 days. 

Original Caption by Science Service
Soviet Foto Agency

National Museum of American History


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