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Mouse mill motor
Froment's "mouse mill" motor was an early form of electric motor, also known as the Revolving Armature Engine.〔(【引用サイトリンク】url=http://physics.kenyon.edu/EarlyApparatus/Daniel_Davis_Apparatus/Revolving_Armature_Engine/Revolving_Armature_Engine.html )〕 It is similar to the contemporary stepper motor, although there is no continuous magnetic circuit between opposed poles.
As the mouse mill motor was simple to construct and its speed could easily be governed, it was later used to drive automatic recorders in telegraphy.
The name derives from the rotor's resemblance to a small treadmill. Their usual size was more to the scale of a hamster than a mouse, but rodents were more common at the time as domestic pests, not domestic pets.
== Construction ==
The motor consists of a freely rotating rotor, surrounded by a number of electromagnets. The rotor is made of a light brass wheel, with a number of soft iron bars or "attractors" mounted around its rim and parallel to the axis. There may be one, two or four electromagnets mounted on the frame of the motor, together with a cam-operated switch for each magnet.〔(【引用サイトリンク】url=http://physics.kenyon.edu/EarlyApparatus/Electric_Motors/Froment_Motor/Froment_Motor.html )〕 Many of the early motors were made by the scientific instrument maker Daniel Davis of Boston,〔(【引用サイトリンク】url=http://physics.kenyon.edu/EarlyApparatus/Daniel_Davis_Apparatus/Daniel_Davis,_Jr._Portrait/Davis_Portrait.html )〕 who sold them as the "Revolving Armature Engine".
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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