Rotation detection or speed pickup device for miniature d-c moto

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by analog...

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324164, 310 68B, 310154, 388912, G05B 500

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active

049147137

ABSTRACT:
In order to pick up in a simple manner which is reliable, and under rough operating conditions, a rotation of the rotor in a miniature motor excited by permanent magnets with magnet segments at a tangential distance with magnet segments distributed at the bore circumference of the stator, it is proposed to arrange in at least one pole gap between the magnet segment a measuring coil. A signal is induced by the pulsation of the stray field due to rotation of the rotor. The measuring coil is advantageously arranged in a non-magnetic, preferably plastic support body held between the individual poles or the magnet segments respectively.

REFERENCES:
patent: 3466477 (1969-04-01), Newill
patent: 3882366 (1975-05-01), Clunis
patent: 3916278 (1975-10-01), Curell et al.
patent: 4082968 (1978-04-01), Jones
patent: 4093882 (1978-06-01), Furuta
patent: 4326153 (1982-04-01), Contri
patent: 4766359 (1988-08-01), Smith et al.
Patent Abstracts of Japan, Band 10, Nr. 213 (E-422) [2269], 25, Jul. 1986; and JP-A-61 52 126 (Matsushita) Electric Ind. Co. Ltd) 14.03, 1986, * Die Ganze Zusammenfassung*.
Patent Abstracts of Japan, Band 9, Nr. 295 (E-360) [2018], Denko K.K.) 18.07.1985, *Die ganze Zusammenfassung*.

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