Kinetron B.v.

Petrus M Knapen

Jonannes H Wouterse

Bernardus Johannes Meyer

Paulus Adrianus Goemans

Generator

A magnetic object having a plurality of pole regions of small dimensions and adapted to be molded in a molding device. The object includes a body of a given shape, for instance a cylindrical block or a cylindrical sleeve having an outer diameter smaller than 5 mm, and including alternating north and south poles. The body is made of a mixture of grains of fully magnetized anisotropic permanent magnet material and a hardening binding agent. The grains are reduced from a permanent magnet until all grains are smaller than the smallest dimension of a pole region and in the pole regions at least those grains having a size of the same range of size as the smallest dimension of a pole region are distributed in accordance with the alternating north and south poles.

Multipolar rotor

Electro-mechanical timepiece, comprising a circuit for generating electric pulses that appear at suitable points of time, a stepper motor controlled by said pulses and comprising a rotor (2) with permanently magnetic poles (8,9), a stator (3,4,5) and a coil (6), as well as a gear driven by the action of the step motor for driving the clock hands, the stator being constructed from two stator parts (3,4) situated on either side of the rotor and a yoke (5), connecting these two parts and extending through said coil. The poles (8,9) are situated in a same cross section plane, perpendicular to the rotation axis of the rotor, and form a ring-shaped layer (14) which is thin in radial direction. According to a preferred embodiment the rotor is at the radial inner side of the poles provided with an uninterrupted round-going ring-shaped portion (7) of soft-magnetic material.

Timepiece having a multipolar rotor

An electric power supply system for portable miniature size power consuming devices, comprising an AC generator, a rechargeable battery and a charging device to be fed from the AC generator and maintaining the battery charging level, the AC generator comprising a multi-polar rotor wheel having permanently magnetized poles, a stator having one or more windings providing the AC current and an eccentric mass driving the permanently magnetized rotor wheel; the rotor wheel, the stator and the eccentric mass being mounted coaxially, a transmission being arranged between the eccentric mass and the rotor wheel. According to the invention the transmission is a loose coupling means to be tightened by magnetic fields between the poles of the rotor wheel and the respective poles of the stator.

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Tilburg, Netherlands

Petrus M Knapen