Method and arrangement for indirectly ascertaining the rotary sp

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor

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324173, 324179, G01R 3102, G01P 348

Patent

active

041386426

ABSTRACT:
A D.C. motor comprises a permanent-magnet stator including a flux-return structure and at least one permanent-magnet stator magnet mounted on the flux-return structure and also an armature mounted for rotation within the stator and having a circumferential succession of armature teeth. The rotary speed of the armature during operation of the D.C. motor is ascertained indirectly by sensing the variations in the stray flux of the motor at the exterior of the flux-return structure.

REFERENCES:
patent: 3404339 (1968-10-01), Mitchell

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