Stepper motor with integrated assembly

Details Stepper motor with integrated assembly Stepper motor with integrated assembly

1991-12-30

1993-09-21

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 91, 411 34, H02K 3700

Patent

active

052472167

ABSTRACT:
A stepper motor of the permanent-magnet sheet-metal type is constructed of a number of modules, simplifying assembly. The modular parts include a stator having integrally-molded winding bobbins and pole pieces. A rotor mounted in the stator includes a barrier member which separates a plastic, threaded hub molded interiorly from a permanent magnet molded exteriorly. A shaft having a first threaded end rotatably engaged with the interior of the rotor hub has a rectangular central portion extending through a rectangular opening of the stator to convert rotary motion of the rotor to linear motion of the shaft. An opposite end of the shaft includes a molded head and a tubular shield extending from the head. This shield and a tubular portion of the stator molding define a labyrinthal passage which inhibits the passage of contaminants into the rotor. A housing of the motor and a rotatably attached flange include engagable portions to lock the flange at a desired angular position.

REFERENCES:
patent: 4015154 (1977-03-01), Tanaka et al.
patent: 4289060 (1981-09-01), Emmett
patent: 4333026 (1982-06-01), Bock et al.
patent: 4625134 (1986-11-01), Weaver
patent: 4714850 (1987-12-01), Akiba et al.
Bauelemente Der Feinmechanik, Verlag Technik Berlin, Oct. 1952, pp. 120, 119, 118, 100 and 86.
Feinwerkelemente: Einfuhrung in die Gestaltung und Berechnung, von Horst Ringhandt, Dec. 1974, pp. 46 and 56.

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