Motor, in particular, for driving a clockwork

Details Motor, in particular, for driving a clockwork Motor, in particular, for driving a clockwork

1989-08-04

1991-10-01

Roskoski, Bernard

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

368160, 310 49R, 310 40MM, H02K 3700, G04F 500

Patent

active

050540092

ABSTRACT:
In a motor, in particular for the electrical driving of a clockwork, a rotor (32) which is mounted rotatably together with a shaft (3) consists of a permanent magnet having diametrically opposite permanent magnet poles. A coil arrangement in the motor comprises two coils (10 and 11) arranged at angular distances of, in particular, 90.degree. apart from each other. In order to produce in the motor, without a stator with salient poles of ferro-magnetic material, detent moments which permit feeding the coils with short pulses, a coil body (14) of non-ferromagnetic material is provided for receiving the coils (10, 11), the coil body being shaped cylindrically inside and outside with webs (17-20) which are arranged at equal distances apart over the circumference and extend cylindrically on the outside, and a screening ring (48) of a material of high residual coercive field strength is disposed concentrically on the coil body for interacting with magnetic fields produced by currents in the coils to produce a remanent bias field retained after deenergization of the coils.

REFERENCES:
patent: 3241397 (1966-03-01), Wilkinson
patent: 3600615 (1971-08-01), Morita
patent: 4115713 (1978-09-01), Decosta et al.
patent: 4482829 (1984-11-01), Tardieu et al.
patent: 4682065 (1987-07-01), English et al.
patent: 4806811 (1989-02-01), Mayumi et al.

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