Step motor

Details Step motor Step motor

1981-08-31

1983-11-15

Roskoski, Bernard

Horology: time measuring systems or devices

Electrical time base

For reciprocating or oscillating element

368158, 310 40MM, G04F 500

Patent

active

044152744

ABSTRACT:
A step motor comprising a stator made by bending a bar-shaped and magnetically highly permeable material into a substantially U-shape which is straight in one leg and curved in the other leg so that the magnetic flux distribution accompanying the curved leg will have a single ridge and the nearest and second nearest distances g.sub.1 and g.sub.2 of the curved leg from a rotor and the distance g.sub.3 between the straight leg and the rotor will maintain such relations as 1.2.ltoreq.g.sub.2 /g.sub.1 .ltoreq.1.8 and 2.1.ltoreq.g.sub.3 /g.sub.1 .ltoreq.3.5, the stator being secured to a main plate as inserted at the curved leg partly into a groove made in the main plate. A part of the curved leg defining the distance g.sub.1 is made to be a tip end part of the curved leg, the width at a part of the groove in which the tip end part of the curved leg is inserted to be secured to the main plate is made to be of the stator width and the groove width at other parts is made comparatively larger than the stator width. A bearing for the rotor shaft is formed integrally with the main plate to easily reliably achieve the distance relations. A quartz clock using the step motor is provided by arranging a gear train on the same main plate of the step motor.

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