Horology: time measuring systems or devices – Chronological – With mechanical or electromechanical driven display
Patent
1995-09-28
1996-11-26
Miska, Vit W.
Horology: time measuring systems or devices
Chronological
With mechanical or electromechanical driven display
368160, 310 40MM, 310 82, 310309, G04B 1900, H02K 3700, H02N 100
Patent
active
055792901
ABSTRACT:
The stator of the motor comprises two pole pieces (1, 2) which are axially staggered. An axially magnetized cylindrical rotor (5) is disposed in the openings or bores of said pole pieces. The rotor (5) is provided with an external toothing (3) which is continuously engaged with an internal toothing (4) of the stator. In the unexcited stator, the rotor (5) assumes a stable position by attraction to the pole pieces (1, 2). Due to the excitation of the stator by a pulse having a suitable polarity, the rotor is displaced to a diametrically opposed stable position. The toothings (3, 4) stay in engagement during said displacement, resulting in an angular displacement of the rotor, the angle being defined by the difference of the number of teeth of said toothings (3, 4). The motor allows a miniaturization and a simple control by alternating pulses of opposed polarities.
REFERENCES:
patent: 2761079 (1956-08-01), Giertz
patent: 3452227 (1969-06-01), Welch
patent: 3984972 (1976-10-01), Yoshino
patent: 4048548 (1977-09-01), Nakajima et al.
patent: 5093594 (1992-03-01), Mehregany
patent: 5237234 (1993-08-01), Jebens et al.
Brandestini Marco
Zafferri Roberto
Miska Vit W.
R. Audemars SA
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